CN114976327A - Battery information collection device and battery monitoring system - Google Patents
Battery information collection device and battery monitoring system Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4278—Systems for data transfer from batteries, e.g. transfer of battery parameters to a controller, data transferred between battery controller and main controller
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention provides a battery information collection device and a battery monitoring system. The battery information collection device is provided with: a communication unit that receives battery data indicating an operating state of a battery from a plurality of battery systems including the battery, and transmits an evaluation threshold value for evaluating thermal runaway of the battery to the battery systems; and a calculation unit that generates an evaluation threshold value based on the battery data acquired from the communication unit and outputs the evaluation threshold value to the communication unit.
Description
Technical Field
The present invention relates to a battery information collection device and a battery monitoring system. This application claims priority from Japanese patent application No. 2021-025625, filed on 19/2021, the contents of which are incorporated herein by reference.
Background
Japanese patent No. 4931378 discloses a power supply apparatus for a vehicle that greatly simplifies a circuit configuration for preventing thermal runaway of a battery, while being capable of reliably preventing thermal runaway. The power supply device includes: the temperature control device includes a plurality of batteries for driving a motor, a temperature detection circuit for detecting a temperature of the batteries, and an abnormal temperature rise prevention circuit for preventing abnormal temperature rise of the batteries. The temperature detection circuit includes: a plurality of temperature sensors configured to be thermally coupled to the battery and vary a resistance according to a temperature of the battery; a voltage conversion circuit that converts a resistance change of each temperature sensor into a voltage change; an a/D converter that converts an output voltage of the voltage conversion circuit into a digital signal; and a control circuit to which the temperature signal output from the a/D converter is input. The abnormal temperature rise prevention circuit includes: a comparator that compares an output voltage output from the voltage conversion circuit of the temperature detection circuit with a reference voltage and outputs an abnormal temperature signal when the battery rises to a set temperature; and a forced current cutoff circuit connected to the comparator and cutting off a current of the battery when an abnormal temperature signal of the comparator is detected. The control circuit and the abnormal temperature rise prevention circuit monitor the temperature of the battery and control the current of the battery.
Incidentally, the above-mentioned background art evaluates thermal runaway in a single vehicle, i.e., a single battery, but the characteristics of thermal runaway vary depending on the operating environment and operating state of the vehicle or battery. In the above-described background art, it is difficult to accurately evaluate thermal runaway for a plurality of batteries different in operating environment and operating state.
Disclosure of Invention
The present invention has been made in view of the above circumstances, and an object thereof is to provide a battery information collection device and a battery monitoring system that can evaluate thermal runaway of a plurality of batteries more accurately than before.
In order to achieve the above object, a battery information collection device according to a first aspect of the present invention includes: a communication unit that receives battery data indicating an operating state of a battery from a plurality of battery systems including the battery, and transmits an evaluation threshold for the battery systems to evaluate thermal runaway of the battery to the battery systems; 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.
According to the first aspect, in the battery information collection device according to the second aspect of the present invention, the calculation unit creates a histogram relating to data values of the plurality of batteries based on the battery data, and generates the evaluation threshold value based on the histogram.
According to the first aspect, in the battery information collection device according to the third aspect of the present invention, the battery data includes: normal battery data when the battery is normal; and abnormal battery data at the time of abnormality of the battery, the arithmetic section having, as the evaluation threshold, a data value between a normal histogram indicating a distribution of the normal battery data and an abnormal histogram indicating a distribution of the abnormal battery data.
According to a fourth aspect of the present invention, in the battery information collecting device according to any one of the first to third aspects, the arithmetic unit generates the evaluation value for each type of the battery data and outputs the evaluation value to the communication unit.
A battery monitoring system according to a fifth aspect of the present invention includes: the battery information collection device according to any one of the first to fourth aspects; and a plurality of the battery systems.
According to the fifth aspect, in the battery information collection device according to the sixth aspect of the present invention, 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.
According to the fifth or sixth aspect, in the battery monitoring system according to the seventh aspect of the present invention, the battery system transmits at least a battery voltage and a battery temperature as the battery data to the battery information collection device.
According to any one of the fifth to seventh aspects, in the battery monitoring system according to the eighth aspect of the present invention, each of the battery systems transmits an abnormality of the battery to the battery information collection device when the thermal runaway of the battery is detected.
According to the present invention, it is possible to provide a battery information collection device and a battery monitoring system that can evaluate thermal runaway of a plurality of batteries more accurately than ever before.
Drawings
Fig. 1 is a system configuration diagram showing a configuration of a battery monitoring system according to an embodiment of the present invention.
Fig. 2A is a block diagram showing a functional configuration of a battery system and a battery data server according to an embodiment of the present invention.
Fig. 2B is a block diagram showing a functional configuration of the battery system and the battery data server according to the embodiment of the present invention.
Fig. 3 is a flowchart illustrating an operation of the battery system in an embodiment of the present invention.
Fig. 4 is a flowchart showing the operation of the battery monitoring assistance server (battery information collection device) in the embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating a histogram calculation method of a battery monitoring system according to an embodiment of the present invention.
Fig. 6A is a schematic diagram illustrating a method for determining thermal runaway in a battery monitoring system according to an embodiment of the present invention.
Fig. 6B is a schematic diagram showing a method of determining thermal runaway in a battery monitoring system according to an embodiment of the present invention.
Detailed Description
Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
As shown in fig. 1, the battery monitoring system a according to the present embodiment includes a plurality of (N) battery systems P1 to Pn, a public line N, and a battery monitoring support server D. The "n" is a natural number of 2 or more.
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, (middle omitted), and the nth battery system Pn is provided in the nth electric vehicle.
The plurality of (n) electric vehicles M1 to Mn are vehicles that run on the basis of running power generated by electric motors, and include 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.
As shown in fig. 2A, the n battery systems P1 to Pn have almost the same functional configuration. That is, the n battery systems P1 to Pn include the battery 1, the CVS2, the BMU3, the communication unit 4, and the abnormality detection circuit 5 as common functional components. The battery 1, the CVS2, the BMU3, and the communication unit 4 are electrically connected to each other.
The battery 1 is a secondary battery that is an assembled battery such as a lithium ion battery or a fuel cell, and is formed by connecting one or a plurality of battery modules in series, and supplies dc power of a total voltage (battery voltage) of voltages of the battery modules to an external load. The battery module constituting the battery 1 is formed by connecting a plurality of battery cells in series. The load is a PCU (Power Control Unit) that electrically drives the electric motor (traveling motor).
In addition, the battery 1 is also provided with some 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). In the case where the battery 1 is configured by a plurality of battery modules, the temperature sensor is provided for each battery module.
CVS2 is a Voltage detection circuit (Cell Voltage Sensor) that is electrically connected to the battery 1 and detects the Voltage (Cell Voltage) of each battery Cell. That is, CVS2 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 the electrode voltage signal. The CVS2 converts the cell voltage (analog voltage) of each battery cell into a digital value (cell voltage data) and outputs the digital value to the BMU 3.
CVS2 amplifies the temperature detection signal input from battery 1 and performs a/D conversion to generate battery temperature data indicating the battery temperature of battery 1. The CVS2 outputs battery temperature data to the BMU3 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.
The CVS2 is provided with a plurality of discharge circuits that are provided for each of the battery cells and forcibly discharge the battery cells. The discharge circuit is a series circuit of an electronic switch that is turned ON/OFF (ON/OFF) based ON a control signal input from the BMU3 and a discharge resistor having a predetermined resistance value. One end of the discharge circuit is connected to one electrode of the battery cell, and the other end of the discharge circuit is connected to the other electrode of the battery cell. In such a discharge circuit, the battery cell is brought into a forced discharge state by setting the electronic switch to the on state, and the battery cell is brought into a non-discharge state by setting the electronic switch to the off state.
The BMU3 is a Battery monitoring device (Battery Management Unit) for monitoring the Battery 1. That is, the BMU3 monitors the operation of the battery 1 by comprehensively controlling the CVS2 and the communication unit 4 based on a monitor control program stored in advance.
More specifically, the BMU3 monitors the operation of the battery 1 based on the battery data (cell voltage data and battery temperature data) input from the CVS2, the current detection signal input from the battery 1, and the control command input from the upper control device of the electric vehicle M1 to Mn, and performs some monitoring processing as needed.
The BMU3 evaluates the thermal runaway of the battery 1 as a 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 transmits the result to the battery monitoring support server D. The battery data in the present embodiment includes normal battery data in a normal state (a state in which thermal runaway does not occur) of the battery 1 and abnormal battery data in an abnormal state (a state in which thermal runaway occurs) of the battery 1.
That is, the BMU3 classifies the battery data (cell voltage data and battery temperature data) into abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) when the battery 1 is thermally runaway and normal battery data (normal cell voltage data and normal battery temperature data) when the battery 1 is not thermally runaway, and transmits them to the battery monitoring assistance server D.
The other monitoring process is cell balance control for equalizing the state of charge of each battery cell. That is, when it is determined that the uniformity of the state of charge of each battery cell is impaired, the BMU3 forcibly discharges the battery cell having the larger amount of charge by setting the discharge circuit of the battery cell having the larger amount of charge to the on state. Thereby restoring the uniformity of the state of charge of the respective battery cells.
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 a transmission packet (uplink communication packet) conforming to the communication protocol of the public line N, transmits the transmission packet to the battery monitoring assistance server D, and receives a transmission packet (downlink communication packet) conforming to the communication protocol of the public line N from the battery monitoring assistance 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) is stored as transmission data in the above-described upstream communication packet. On the other hand, an evaluation threshold for the BMU3 to evaluate the thermal runaway of the battery 1 is stored as transmission data in the above-described downstream communication packet.
The abnormality detection circuit 5 is electrically connected to the battery 1, the CVS2, and the BMU3, and an electrode voltage signal and a temperature detection signal of each battery cell are input from the battery 1. The abnormality detection circuit 5 determines whether the operating state of the battery 1 is normal or abnormal by comparing the respective electrode voltage signals and the temperature detection signal with the evaluation threshold, and outputs the determination results to the CVS2 and the BMU 3.
That is, when the abnormality detection circuit 5 determines that the battery 1 is abnormal based on the comparison result of the electrode voltage signals and the temperature detection signals with the evaluation threshold, an abnormality signal indicating the battery abnormality is output to the CVS2 and the BMU 3. On the other hand, when the abnormality detection circuit 5 determines that the battery 1 is normal based on the comparison result of the electrode voltage signals and the temperature detection signal with the evaluation threshold, a normal signal indicating that the battery is normal is output to the CVS2 and the BMU 3.
Here, the n battery systems P1 to Pn have a sleep mode and a normal mode as operation modes. The sleep mode is a power saving mode in which a function is defined compared to the normal mode. Further, the normal mode is an operation mode in which all possible functions are exerted, and is a power mode in which power consumption is greatly increased as compared with the power saving mode.
Among the batteries 1, CVS2, BMU3, communication unit 4, and abnormality detection circuit 5 constituting each of the battery systems P1 to Pn, the abnormality detection circuit 5 is a constantly energized circuit that is constantly energized to exhibit a desired function regardless of whether the sleep mode or the normal mode is adopted. In contrast, the CVS2 and the BMU3 are emergency power supply circuits that are supplied with power and perform a desired function in the normal mode, but are not supplied with power and do not perform a desired function in the sleep mode.
The public line N shown in fig. 1 is a wireless communication line such as a mobile phone, and relays wireless communication between the N battery systems P1 to Pn and the battery monitoring support server D. The public line N is connected to a known internet, and a battery monitoring support server D provided on the internet as a Web server can be wirelessly and collectively connected to N battery systems P1 to Pn as mobile terminals.
The battery monitoring support server D is a battery information collection device according to the present embodiment. As described above, the battery monitoring assistance server D is provided on the internet as a Web server. The n battery systems P1 to Pn are located on the client side of the battery monitoring assistance server D (Web server).
As shown in fig. 2B, the battery monitoring support server D includes a communication unit 6, a calculation unit 7, and a storage unit 8. The communication unit 6 is a wireless communication device that performs wireless communication via the public line N, as in 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 common line N and transmits the transmission packet to each of the battery systems P1 to Pn, and receives a transmission packet (uplink communication packet) conforming to the communication protocol of the common line N from each of the battery systems P1 to Pn.
The 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 uplink communication packet, and outputs the transmission data to the operation unit 7. The communication unit 6 stores the evaluation threshold value input from the calculation unit 7 in an uplink communication packet as transmission data, and transmits the transmission data to each of the battery systems P1 to Pn.
The computing unit 7 performs predetermined information processing based on the battery monitoring support program read from the storage unit 8. That is, the computing unit 7 is electrically connected to the communication unit 6 and the storage unit 8, and stores 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 the normal battery data (normal cell voltage data and normal battery temperature data) in the storage unit 8 based on the battery monitoring support program.
The arithmetic unit 7 generates an evaluation threshold value from 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 arithmetic unit 7 performs predetermined information processing on the abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) and the normal battery data (normal cell voltage data and normal battery temperature data) temporarily stored in the storage unit 8, and generates the evaluation threshold.
The storage unit 8 stores attribute data of the batteries 1 mounted on the electric vehicles M1 through Mn in advance in each battery 1. The storage unit 8 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 operation unit 7. The storage unit 8 stores the battery monitoring support program in advance.
Next, the operation of the battery monitoring system a relating to the present embodiment will be described in detail with reference to flowcharts shown in fig. 3 and 4.
In the battery monitoring system a, the N battery systems P1 to Pn and the battery monitoring support server D (the battery information collection device according to the present embodiment) wirelessly communicate with each other via the public line N, whereby the thermal runaway of the respective batteries 1 mounted on the electric vehicles M1 to Mn can be evaluated more accurately than before.
First, the operation of each of the battery systems P1 to Pn will be described with reference to the flowchart of fig. 3. In each of the battery systems P1 to Pn, the abnormality detection circuit 5, which is an always-on circuit, always performs state evaluation of the battery 1 based on the electrode voltage signal and the temperature detection signal of each battery cell and the evaluation threshold regardless of whether it is the sleep mode or the normal mode (step S1).
When the detection result of such 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 the BMU 3. The CVS2 and BMU3 are started to supply power and start up when their own operation mode is the sleep mode (step S2). That is, when an abnormality signal is input from the abnormality detection circuit 5, the operation mode of the CVS2 and the BMU3 switches from the sleep mode to the normal mode.
Then, the CVS2 starts acquiring the cell voltage and the battery temperature from the battery 1, sequentially acquires the cell voltage and the battery temperature at regular time intervals (step S3), and sequentially outputs abnormal cell voltage data indicating the cell voltage and abnormal battery temperature data indicating the battery temperature, that is, abnormal battery data to the BMU 3. Then, the BMU3 sequentially saves the abnormal battery data sequentially input from the CVS2 in the internal memory (step S4).
Then, when the data amount of the abnormal battery data in the internal memory exceeds the predetermined amount (step S5), the BMU3 transmits the abnormal battery data to the communication unit 4 (step S6). That is, the BMU3 reads a predetermined amount of abnormal battery data from the internal memory and outputs the abnormal battery data to the communication unit 4, mounts the predetermined amount of abnormal battery data on the uplink communication packet, and transmits the abnormal battery data to the battery monitoring support server D.
On the other hand, when the evaluation battery 1 is "normal" (step S1), the abnormality detection circuit 5 outputs a normal signal to the CVS2 and the BMU 3. The CVS2 and the BMU3 are started when the operation mode itself is the sleep mode, but when the operation mode is the normal mode, the CVS2 starts to acquire the cell voltage and the battery temperature from the battery 1. Then, the CVS2 sequentially acquires the cell voltage and the battery temperature at regular 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. Then, the BMU3 sequentially saves the normal battery data sequentially input from the CVS2 in the internal memory (step S8).
Then, when the data amount of the normal battery data in the internal memory exceeds the predetermined amount (step S9), the BMU3 transmits the normal battery data to the communication section 4 (step S10). That is, the BMU3 reads a predetermined amount of normal battery data from the internal memory and outputs the same to the communication unit 4, and mounts the predetermined amount of normal battery data on the uplink communication packet and transmits the same 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, the update request is input from the communication unit 4 to the BMU 3. When the update request is input from the communication unit 4 to the BMU3, the BMU3 starts supplying power and starts up when its own operation mode is the sleep mode (step S11). That is, when an update request is input from the communication section 4, the operation modes of the CVS2 and the BMU3 are switched from the sleep mode to the normal mode.
Then, the BMU3 makes the communication unit 4 receive a new evaluation threshold (updated evaluation threshold) based on the update request (step S12). Then, the BMU3 saves the update evaluation threshold in the internal memory (step S13). The abnormality detection circuit 5 uses the update evaluation threshold to evaluate the operating state of the battery 1 when the update evaluation threshold is newly held in the internal memory.
That is, in each of the battery systems P1 to Pn of the present embodiment, the evaluation threshold for evaluating the operating state of the battery 1 is updated every time the updated evaluation threshold is newly stored in the BMU 3.
In addition, as shown in the flowchart of fig. 4, the evaluation threshold values that are sequentially updated in the respective battery systems P1 to Pn are generated based on the abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) and the normal battery data (normal cell voltage data and normal battery temperature data) that the battery monitoring assistance server D receives from the battery systems P1 to Pn.
The communication unit 6 of the battery monitoring support server D receives the upstream communication packet sequentially transmitted from the communication units 1 of the battery systems 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 packet, and outputs the data to the operation unit 7.
Then, the arithmetic unit 7 sequentially stores (saves) the abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) or the normal battery data (normal cell voltage data and normal battery temperature data) sequentially input from the communication unit 6 in the storage unit 8.
Then, the arithmetic unit 7 performs statistical processing described below on the abnormal cell data (abnormal cell voltage data and abnormal cell temperature data) and the normal cell data (normal cell voltage data and normal cell temperature data) read from the storage unit 8, thereby creating a thermal runaway model of the battery 1 (step Sa 2).
That is, the arithmetic unit 7 performs histogram processing on the plurality of abnormal battery data (abnormal cell voltage data and abnormal battery temperature data) and the plurality of normal battery data (normal cell voltage data and normal battery temperature data) acquired from each battery system P1, thereby creating histograms of the abnormal battery data and the normal battery data as shown in fig. 5.
The histogram is created for each kind of abnormal battery data as well as normal battery data. That is, the calculation unit 7 creates a cell voltage histogram relating to the abnormal cell voltage data and the normal cell voltage data, and a battery temperature histogram relating to the abnormal battery temperature data and the normal battery temperature data.
As shown in fig. 5, the histogram of each category has a different frequency distribution in which the data values are independent for abnormal battery data as well as normal battery data. That is, since the abnormal histogram formed of the plurality of abnormal cell data and the normal histogram formed of the plurality of normal cell data are acquired when the operation states of the battery 1 are different, independent individual frequency distributions that do not overlap each other are formed.
The histogram of each kind of such abnormal battery data as well as the normal battery data is a statistical thermal runaway model of the battery 1. That is, the thermal runaway model of the battery 1 in the present embodiment is composed of a plurality of histograms given for each kind of abnormal battery data and normal battery data.
For each of the types of histograms (cell voltage histogram and battery temperature histogram), the arithmetic section 7 extracts the data value R located in the middle between the minimum value of the abnormal histogram and the maximum value of the normal histogram as the update evaluation threshold (step Sa 3).
The arithmetic unit 7 calculates a difference between the updated estimation threshold extracted in this manner and the current estimation threshold, that is, a change amount (threshold change amount) between the updated estimation threshold extracted in step Sa3 and the estimation threshold set in the previous update processing (step Sa 4). Then, the arithmetic section 7 determines whether or not the threshold variation exceeds a preset variation evaluation value (step Sa 5).
Then, when the determination in step Sa5 is yes, the arithmetic section 7 outputs the update evaluation threshold value extracted in step Sa3 to the communication section 6, and transmits it to each of the battery systems P1 to Pn (step Sa 6). That is, when the update evaluation threshold is input from the calculation unit 7, the communication unit 6 mounts the update evaluation threshold on the downstream communication packet and transmits the update evaluation threshold to each of the battery systems P1 to Pn.
According to the present embodiment as described above, since the battery monitoring assistance 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 update evaluation threshold value reflects the operation states of the plurality of batteries 1 in the plurality of battery systems P1 to Pn. Therefore, according to the present embodiment, thermal runaway of the plurality of batteries 1 can be evaluated more accurately than ever.
Further, since the updated evaluation threshold values in the plurality of battery systems P1 to Pn are received and updated from the battery monitoring assistance server D each time the threshold variation exceeds the variation evaluation value, appropriate updating is performed during use of the battery 1. That is, according to the present embodiment, since the update evaluation threshold values are updated in time series, it is possible to accurately judge thermal runaway of the plurality of batteries 1 during use of the batteries 1.
Further, according to the present embodiment, since the evaluation threshold values for evaluating the cell voltage and the battery temperature are generated based on the abnormal battery data and the normal battery data in the plurality of batteries 1, the thermal runaway of the plurality of batteries 1 can be evaluated more accurately based on the cell voltage and the battery temperature.
Further, according to the present embodiment, since the battery information collection device is configured as the Web server which is the battery monitoring support server D, it is possible to easily exchange information with the plurality of battery systems P1 to Pn, that is, the plurality of electric vehicles M1 to Mn which are moving bodies. Therefore, according to the present embodiment, the battery monitoring system a with excellent convenience can be provided.
The present invention is not limited to the above embodiment, and for example, the following modifications are conceivable.
(1) In the above-described embodiment, the description has been given of the case where the kind of the battery data, that is, the parameter for evaluating the thermal runaway of the battery 1, is the cell voltage data (cell voltage) and the battery temperature data (battery temperature), but the present invention is not limited thereto. As the kind of the battery data, i.e., the parameter for evaluating the thermal runaway of the battery 1, for example, the contents shown in fig. 6A may be considered.
That is, as the type of the battery data, in addition to the cell voltage data (cell voltage) and the battery temperature data (battery temperature), for example, the overall SOC (State of Charge) data (SOC) of the battery 1, the Charge cycle data (cycle) of the battery 1, the type data (type) of the battery 1, the vehicle type data (vehicle type) of the electric vehicles M1 to Mn mounted with the battery 1, the use environment data (use environment) of the battery 1 (electric vehicles M1 to Mn), and the like may be considered.
Each of the battery systems P1 to Pn transmits the above-described cell voltage data, battery temperature data, SOC data, charge cycle data, category data, vehicle type data, usage environment data, and the like to the battery monitoring support server D (battery information collection device). In contrast, as shown in fig. 6B, the battery monitoring support server D creates a plurality of histograms based on voltage data, battery temperature data, SOC data, charge cycle data, type data, vehicle type data, usage environment data, and the like.
Then, the battery monitoring assistance server D generates 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, an evaluation threshold value (SOC voltage evaluation threshold value) corresponding to the SOC data, an evaluation threshold value (charging cycle evaluation threshold value) corresponding to the charging cycle data, an evaluation threshold value (battery type evaluation threshold value) corresponding to the type data, an evaluation threshold value (vehicle type evaluation threshold value) corresponding to the vehicle type data, an evaluation threshold value (usage environment evaluation threshold value) corresponding to the usage environment data, and the like based on the respective histograms.
Then, the battery monitoring assistance server D transmits 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 threshold, vehicle type evaluation threshold, usage environment evaluation threshold, and the like) to the respective battery systems P1 to Pn., and then the respective battery systems P1 to Pn perform evaluation of thermal runaway of the own battery 1 based on the cell voltage evaluation threshold, battery temperature evaluation threshold, SOC voltage evaluation threshold, charge cycle evaluation threshold, battery type evaluation threshold, vehicle type evaluation threshold, usage environment evaluation threshold, and the like.
(2) In the above-described embodiment, the threshold variation exceeding the variation evaluation value is taken as the update condition, but the present invention is not limited thereto. An amount other than the threshold change amount may be used as the update condition. For example, the elapsed time from the last update time or the like may be used as the update condition. Also, in the case where the above-described elapsed time is set as the update condition, when the elapsed time exceeds the prescribed elapsed time evaluation value, the evaluation threshold value newly acquired at this time is transmitted to each of the battery systems P1 to Pn to be updated.
(3) In the above embodiment, the thermal runaway model composed of histograms of various battery data was created, but the present invention is not limited to this. For example, a thermal runaway model may be made based on statistical data other than histograms.
(4) In the above-described embodiment, the plurality of battery systems P1 to Pn and the battery monitoring support server D (battery information collection device) are connected so as to be able to communicate wirelessly via the public line N (relay line), but the present invention is not limited to this. That is, the plurality of battery systems P1 to Pn may be directly connected to the battery monitoring support server D (battery information collection device) so as to be able to wirelessly communicate with each other without a relay line.
Claims (14)
1. A battery information collection device is provided with:
a communication unit that receives battery data indicating an operating state of a battery from a plurality of battery systems including the battery, and transmits an evaluation threshold for the battery systems to evaluate thermal runaway of the battery to the battery systems; and
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.
2. The battery information collecting apparatus according to claim 1,
the calculation unit creates a histogram relating to data values of the plurality of batteries based on the battery data, and generates the evaluation threshold value based on the histogram.
3. The battery information collecting apparatus according to claim 1,
the battery data includes:
normal battery data when the battery is normal; and
abnormal battery data at the time of abnormality of the battery,
the calculation unit takes 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.
4. The battery information collecting apparatus according to claim 1,
the arithmetic unit generates the evaluation value for each type of the battery data and outputs the evaluation value to the communication unit.
5. The battery information collecting apparatus according to claim 2,
the arithmetic unit generates the evaluation value for each type of the battery data and outputs the evaluation value to the communication unit.
6. The battery information collecting apparatus according to claim 3,
the arithmetic unit generates the evaluation value for each type of the battery data and outputs the evaluation value to the communication unit.
7. A battery monitoring system is provided with:
the battery information collecting apparatus according to any one of claims 1 to 6; and
a plurality of the battery systems.
8. The battery monitoring system of claim 7,
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.
9. The battery monitoring system of claim 7,
the battery system transmits at least a battery voltage and a battery temperature as the battery data to the battery information collection device.
10. The battery monitoring system of claim 8,
the battery system transmits at least a battery voltage and a battery temperature as the battery data to the battery information collection device.
11. The battery monitoring system of claim 7,
each of the battery systems transmits an abnormality of the battery to the battery information collection device when the thermal runaway of the battery is detected.
12. The battery monitoring system of claim 8,
each of the battery systems transmits an abnormality of the battery to the battery information collection device when the thermal runaway of the battery is detected.
13. The battery monitoring system of claim 9,
each of the battery systems transmits an abnormality of the battery to the battery information collection device when the thermal runaway of the battery is detected.
14. The battery monitoring system of claim 10,
each of the battery systems transmits an abnormality of the battery to the battery information collection device when the thermal runaway of the battery is detected.
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