JP6168962B2 - Abnormality determination device, charge / discharge information presentation device, secondary battery module, abnormality determination method, and program - Google Patents

Description

  The present invention relates to an abnormality determination device, a charge / discharge information presentation device, a secondary battery module, an abnormality determination method, and a program.

  A secondary battery such as a lithium ion battery may be used as a secondary battery module including a plurality of cell batteries. Such a secondary battery module is provided with a BMU that controls a plurality of cell batteries. The BMU collects cell battery information and performs cell battery abnormality determination. For example, Patent Document 1 discloses a technique for determining whether or not a cell battery may fall into an abnormal state by comparing parameter values and threshold values of a plurality of cell batteries. Examples of parameter values include voltage.

JP 2011-76746 A

  By the method disclosed in Patent Document 1, the BMU can determine abnormality of the cell battery itself such as abnormal heat generation of the cell battery. On the other hand, the BMU cannot determine abnormality of peripheral devices included in the secondary battery module such as a sensor and a fan provided in the secondary battery module.

  The objective of this invention is related with the abnormality determination apparatus which can determine the presence or absence of abnormality of the secondary battery module containing a cell battery and a peripheral device, a charging / discharging information presentation apparatus, a secondary battery module, the abnormality determination method, and a program.

  A first aspect includes a temperature calculation unit that calculates a temperature of the secondary battery module based on a physical quantity related to electricity that is charged and discharged by the secondary battery module, the temperature calculated by the temperature calculation unit, and the secondary battery module An abnormality determination device comprising: a determination unit that determines that the secondary battery module is abnormal when a difference from the actual measured temperature exceeds a predetermined temperature range.

  Further, the second aspect is based on the measured temperature of the secondary battery module or the charging rate of the secondary battery module, and the secondary with respect to the measured temperature of the secondary battery module or the charging rate of the secondary battery module. A temperature range specifying unit that specifies the temperature range that becomes wider as the rate of change of the internal resistance value of the battery module increases, and the determination unit calculates the temperature calculated by the temperature calculation unit and the measured temperature of the secondary battery module The abnormality determination device according to the first aspect, in which the secondary battery module determines that the secondary battery module is abnormal when the difference exceeds a temperature range specified by the temperature range specifying unit.

  In addition, according to a third aspect, when the determination unit continues a state in which a difference between the temperature calculated by the temperature calculation unit and the measured temperature of the secondary battery module exceeds a predetermined temperature range for a predetermined determination time or longer. The abnormality determination device according to claim 1 or 2, wherein the secondary battery module is determined to be abnormal.

  Further, the fourth aspect is based on the measured temperature of the secondary battery module or the charging rate of the secondary battery module, and the secondary with respect to the measured temperature of the secondary battery module or the charging rate of the secondary battery module. A determination time specifying unit that specifies the determination time that is longer as the rate of change of the internal resistance value of the battery module is larger, and the determination unit is configured to calculate the temperature calculated by the temperature calculation unit and the measured temperature of the secondary battery module; The abnormality determination device according to the third aspect, in which the secondary battery module determines that the secondary battery module is abnormal when a state in which the difference exceeds a predetermined temperature range continues for the determination time specified by the determination time specifying unit or longer. .

  In addition, according to a fifth aspect, the temperature calculation unit is configured so that the secondary battery module at the second time is a time after a predetermined time has elapsed from the first time, based on the physical quantity related to the electricity at the first time. The temperature is calculated, and when the difference between the measured temperature of the secondary battery module measured at the second time and the temperature calculated by the temperature calculator exceeds a predetermined temperature range, The abnormality determination device according to any one of the first to fourth aspects, which determines that the secondary battery module is abnormal.

  Moreover, a 6th aspect is equipped with the ventilation determination part which determines whether the ventilation fan which supplies a refrigerant | coolant to the said secondary battery module is operating, The said temperature calculation part is based on the presence or absence of the operation | movement of the said ventilation fan. Any one of the first to fifth aspects of calculating the temperature of the secondary battery module based on the heat transfer coefficient of the secondary battery module determined in accordance with the physical quantity related to the electricity charged and discharged by the secondary battery module The abnormality determination device described in 1.

  The seventh aspect includes an internal resistance storage unit that stores the temperature of the secondary battery module, the charging rate of the secondary battery module, and the internal resistance value of the secondary battery module in association with each other, and the temperature The calculation unit is configured to calculate the secondary battery based on an actual resistance value of the secondary battery module, an internal resistance value associated with a charging rate of the secondary battery module, and a physical quantity related to electricity charged and discharged by the secondary battery module. The abnormality determination device according to any one of the first to sixth aspects for calculating the temperature of the module.

  Further, an eighth aspect is based on the physical quantity related to the electricity of the secondary battery module when the physical quantity related to the electricity of the secondary battery module becomes a predetermined change rate or less. An internal resistance calculation unit that calculates a resistance value; and a resistance deterioration coefficient calculation unit that calculates a ratio between the internal resistance value calculated by the internal resistance calculation unit and the internal resistance value stored by the internal resistance storage unit as a resistance deterioration coefficient; The temperature calculation unit includes a value obtained by multiplying the internal resistance value associated with the measured temperature of the secondary battery module and the charging rate of the secondary battery module by the resistance degradation coefficient, and the secondary battery module The abnormality determination device according to the seventh aspect, in which the temperature of the secondary battery module is calculated based on a physical quantity related to electricity to be discharged.

  Further, the ninth aspect is that the secondary battery module is continuously charged / discharged for a predetermined continuous charge / discharge time based on the ambient temperature of the secondary battery module, whereby the temperature of the secondary battery module is increased. A physical quantity calculation unit that calculates a physical quantity related to charge / discharge that is equal to or higher than a predetermined abnormality determination temperature; and a presentation unit that presents information based on the physical quantity calculated by the physical quantity calculation unit. The abnormality determination device according to any one of the aspects.

  In the tenth aspect, the presentation unit presents a warning when a difference between a physical quantity related to charging / discharging of the secondary battery module and a physical quantity calculated by the physical quantity calculation unit exceeds a predetermined range. The abnormality determination device according to the ninth aspect.

  Further, according to an eleventh aspect, the temperature calculation unit is configured such that the temperature change amount of the secondary battery module, the internal resistance value relating to the deterioration of the secondary battery module, and the physical quantity of electricity relating to charging / discharging of the secondary battery module. The temperature of the secondary battery module is calculated according to any one of the first to tenth aspects, in which the temperature of the secondary battery module is calculated based on an expression showing a relationship between the heat generation amount determined by the difference between the heat generation amount to the atmosphere of the secondary battery module. Abnormality judgment device.

  Further, the twelfth aspect is that the temperature of the secondary battery module is predetermined by continuing charging and discharging of the secondary battery module for a predetermined continuous charging and discharging time based on the ambient temperature of the secondary battery module. A charge / discharge information presentation device comprising: a physical quantity calculation unit that calculates a physical quantity related to charge / discharge that is equal to or higher than an abnormality determination temperature; and a presentation unit that presents information based on the physical quantity calculated by the physical quantity calculation unit.

  In addition, in a thirteenth aspect, the physical quantity calculation unit includes a calorific value determined by a temperature change amount of the secondary battery module, an internal resistance value relating to deterioration of the secondary battery module, and an electrical physical quantity relating to charge / discharge, and The charging / discharging information presentation apparatus according to the twelfth aspect, wherein the physical quantity related to the charging / discharging is calculated based on an expression indicating a relationship of a difference in heat dissipation amount to the atmosphere of the secondary battery module.

  A fourteenth aspect is a secondary battery module including a plurality of cell batteries and the abnormality determination device according to any one of the first to eleventh aspects.

  The fifteenth aspect is an abnormality determination method for determining whether or not the secondary battery module is abnormal, and the secondary battery module is configured based on a physical quantity related to electricity charged and discharged by the secondary battery module. A step of calculating a temperature, and a step of determining that the secondary battery module is abnormal when a difference between the temperature calculated by the temperature calculation unit and the measured temperature of the secondary battery module exceeds a predetermined temperature range. And an abnormality determination method.

  In addition, the sixteenth aspect is the computer including a temperature calculation unit that calculates a temperature of the secondary battery module based on a physical quantity related to electricity that is charged and discharged by the secondary battery module, the temperature calculated by the temperature calculation unit, and the temperature This is a program for functioning as a determination unit that determines that the secondary battery module is abnormal when the difference from the measured temperature of the secondary battery module exceeds a predetermined temperature range.

  According to at least one aspect among the above aspects, it is possible to determine whether there is an abnormality in the secondary battery module including the cell battery and the peripheral device.

It is the schematic which shows the structure of the secondary battery module which concerns on at least 1 embodiment. It is a schematic block diagram which shows the structure of BMU which concerns on 1st Embodiment. It is a figure which shows an example of the relationship between cell temperature and internal resistance value at the time of fixing the charging rate of a cell battery. It is a figure which shows an example of the relationship between the charging rate of a cell battery when a cell temperature is fixed, and an internal resistance value. It is a flowchart which shows the abnormality determination method of the secondary battery module which concerns on 1st Embodiment. It is a schematic block diagram which shows the structure of BMU which concerns on 2nd Embodiment. It is a schematic block diagram which shows the structure of BMU which concerns on 3rd Embodiment. It is a schematic block diagram which shows the structure of BMU which concerns on 4th Embodiment. It is a schematic block diagram which shows the structure of the computer which concerns on at least 1 embodiment.

Hereinafter, embodiments will be described in detail with reference to the drawings.
<< First Embodiment >>
FIG. 1 is a schematic diagram illustrating a configuration of a secondary battery module 1 according to at least one embodiment.
The secondary battery module 1 includes an outer casing 11, a plurality of cell batteries 12, a plurality of CMUs 13 (cell monitoring unit), a blower fan 14, an ambient temperature sensor 15, and a BMU 16 (battery management unit). Control circuit).

The cell batteries 12 are provided inside the housing 11 and are connected in series. In the example shown in FIG. 1, the number of cell batteries 12 in the housing 11 is four, but the number of cell batteries 12 may be other than four.
The CMU 13 is provided for each cell battery 12 and measures the voltage value, current value, and cell temperature of the cell battery 12. That is, the CMU 13 acquires sensor values from current sensors, voltage sensors, and temperature sensors (not shown) provided for each cell battery 12. Note that the cell temperature measured by the CMU 13 in this embodiment is an example of an actually measured temperature. In addition, the CMU 13 is provided not for each cell battery 12 but for a plurality of cell batteries, and a measurement cable is extended from the cell battery 12 to each cell battery 12 so that the voltage value, current value, and cell of each cell battery 12 are extended. The temperature may be measured. If the cell batteries 12 are connected in series, the current values of the cell batteries 12 are all the same. Therefore, the current values may be measured at any one of the plurality of cell batteries 12 connected in series. .
The blower fan 14 has a function of forcibly moving the air heated by the heat generated inside the housing from the inside of the housing 11. In the present embodiment, air is an example of a refrigerant.
The ambient temperature sensor 15 measures the ambient temperature of the secondary battery module 1. That is, the ambient temperature sensor 15 measures the temperature outside the housing 11.

  The BMU 16 monitors and controls the secondary battery module 1. The BMU 16 determines whether a failure has occurred in any of the cell battery 12, the voltage sensor, the current sensor, the cell temperature sensor, and the ambient temperature sensor 15. In the present embodiment, the BMU 16 is an example of an abnormality determination device. In the example shown in FIG. 1, one BMU 16 is installed for each secondary battery module, but one BMU 16 may be installed for a plurality of secondary battery modules 1. When the number of cell batteries 12 is small, the voltage value, current value, and cell temperature of each cell battery 12 may be measured by the BMU 16.

FIG. 2 is a schematic block diagram showing the configuration of the BMU 16 according to the first embodiment.
The BMU 16 includes a sensor value acquisition unit 101, a charge rate estimation unit 102, an internal resistance storage unit 103, an internal resistance specification unit 104, a temperature range specification unit 105, a determination time specification unit 106, a temperature calculation unit 107, a calculated temperature storage unit 108, A difference calculating unit 109, a determining unit 110, and a time measuring unit 111 are provided.

  The sensor value acquisition unit 101 acquires a voltage value, a current value, and a cell temperature from the CMU 13. The sensor value acquisition unit 101 acquires the ambient temperature of the secondary battery module 1 from the ambient temperature sensor 15.

  The charging rate estimation unit 102 estimates the charging rate of the cell battery 12 based on the voltage value or current value acquired by the sensor value acquisition unit 101. For example, the charging rate estimation unit 102 estimates the charging rate of the cell battery 12 based on the open circuit voltage estimated from the voltage value acquired by the sensor value acquisition unit 101. For example, the charging rate estimation unit 102 estimates the charging rate of the cell battery 12 based on the integrated value of the current values acquired by the sensor value acquisition unit 101.

  The internal resistance storage unit 103 stores the internal resistance value when the cell battery 12 without deterioration has the temperature and the charging rate in association with the combination of the cell temperature and the charging rate. The internal resistance value is a value obtained in advance through experiments or the like.

  The internal resistance specifying unit 104 reads the internal resistance value associated with the combination of the cell temperature acquired by the sensor value acquisition unit 101 and the charging rate estimated by the charging rate estimation unit 102 from the internal resistance storage unit 103, The internal resistance value of the cell battery 12 is specified.

  The temperature range specifying unit 105 specifies a temperature range that becomes wider as the internal resistance value increases. For example, the temperature range specifying unit 105 specifies the temperature range based on a table indicating the relationship between the internal resistance value and the temperature range. Further, for example, the temperature range specifying unit 105 specifies the temperature range by substituting the internal resistance into a predetermined monotonous non-decreasing function. In the present embodiment, the lower limit value of the temperature range specified by the temperature range specifying unit 105 is 0 degrees.

  Based on the internal resistance value specified by the internal resistance specifying unit 104, the determination time specifying unit 106 specifies a determination time for monotonously non-decreasing with respect to the internal resistance value. That is, the determination time specifying unit 106 specifies a determination time that increases as the internal resistance value increases. For example, the determination time specifying unit 106 may specify the determination time based on a table indicating the relationship between the internal resistance value and the determination time. Further, for example, the determination time specifying unit 106 may specify the determination time by substituting the internal resistance into a function determined in advance.

  The temperature calculation unit 107 calculates the cell temperature using the ambient temperature and current value acquired by the sensor value acquisition unit 101 and the internal resistance value specified by the internal resistance specifying unit 104. Specifically, the temperature calculation unit 107 calculates the cell temperature according to the following equation (1).

Ts _(t) is the cell temperature at time t calculated by the temperature calculation unit 107. That is, Ts _(t) is a theoretical value of the cell temperature at time t. ΔT is a calculation period of the cell temperature by the temperature calculation unit 107. H is a heat transfer coefficient of the cell battery 12. A is the heat transfer area of the cell battery 12. C is the specific heat of the cell battery 12. M is the mass of the cell battery 12. T∞ _(t) is the ambient temperature of the secondary battery module 1 at time t. I _(t) is the current value of the current flowing through the cell battery 12 at time t. DCR _(t) is the internal resistance value of the cell battery 12 at time t. Among these, the calculation period ΔT, the heat transfer coefficient H, the heat transfer area A, the specific heat C, and the mass M are values obtained in advance by measurement.
In the present embodiment, time t is an example of the first time, and time t + ΔT is an example of the second time.

  In addition, Formula (1) represents the heat calculation formula (2) shown by a differential equation with a forward difference discrete formula. That is, Expression (1) is equivalent to Expression (2). Expression (2) is an expression showing the relationship between the temperature change amount of the secondary battery module 1, the heat generation amount determined by the internal resistance value and the current value, and the difference in the heat dissipation amount to the atmosphere of the secondary battery module 1.

  The calculated temperature storage unit 108 stores the cell temperature calculated by the temperature calculation unit 107 in association with the time. Specifically, the calculated temperature storage unit 108 stores the cell temperature at time t + ΔT calculated by the temperature calculation unit 107 at time t in association with time t + ΔT.

  The difference calculation unit 109 calculates an absolute difference between the cell temperature stored in the calculation temperature storage unit 108 and the cell temperature acquired by the sensor value acquisition unit 101. That is, the difference calculation unit 109 calculates the absolute difference between the cell temperature acquired by the sensor value acquisition unit 101 at time t + ΔT and the cell temperature at time t + ΔT calculated by the temperature calculation unit 107 at time t.

The determination unit 110 determines whether or not the state in which the difference absolute value calculated by the difference calculation unit 109 exceeds the temperature range specified by the temperature range specifying unit 105 has continued for the determination time specified by the determination time specifying unit 106. Thus, it is determined whether or not the secondary battery module 1 is abnormal.
The time measuring unit 111 measures the duration of the state in which the difference absolute value calculated by the difference calculating unit 109 exceeds the temperature range specified by the temperature range specifying unit 105.

Here, the reason why the temperature range and the determination time are set to values that do not monotonously decrease with respect to the internal resistance value will be described.
FIG. 3 is a diagram showing an example of the relationship between the cell temperature and the internal resistance value when the charging rate of the cell battery 12 is fixed.
As shown in FIG. 3, the lower the cell temperature, the higher the internal resistance value of the cell battery 12. Further, as shown in FIG. 3, the lower the cell temperature, that is, the higher the internal resistance value, the higher the rate of change of the internal resistance value. That is, the higher the internal resistance value, the greater the variation in the internal resistance value due to the temperature sensor error. Therefore, by using the temperature range and the determination time that are monotonously non-decreasing with respect to the internal resistance value, it is possible to prevent the abnormality from being erroneously detected due to the variation.
It is clear from the above description that the monotonic non-decreasing with respect to the internal resistance value is equivalent to the monotonic non-decreasing with respect to the rate of change of the internal resistance value with respect to the cell temperature.

FIG. 4 is a diagram showing an example of the relationship between the charging rate of the cell battery 12 and the internal resistance value when the cell temperature is fixed.
As shown in FIG. 4, the internal resistance value of the cell battery 12 becomes higher as the charge rate of the cell battery 12 is separated from a predetermined charge rate (for example, 50%). Further, as shown in FIG. 4, the rate of change of the internal resistance value becomes higher as the charging rate of the cell battery 12 is separated from the predetermined charging rate, that is, as the internal resistance value is higher. That is, the higher the internal resistance value, the larger the variation in the internal resistance value due to a charging rate estimation error caused by an error of the voltage sensor or current sensor. Therefore, by using the temperature range and the determination time that are monotonously non-decreasing with respect to the internal resistance value, it is possible to prevent the abnormality from being erroneously detected due to the variation. The relationship between the charging rate and the internal resistance value is not limited to the example shown in FIG. For example, depending on the design of the secondary battery, the lower the charging rate of the cell battery 12, the higher the internal resistance may be.
In addition, it is clear from the above description that the monotonous non-decreasing with respect to the internal resistance value is equivalent to the monotonic non-decreasing with respect to the rate of change of the internal resistance value with respect to the charging rate.

Next, the abnormality determination method for the secondary battery module 1 according to the first embodiment will be described.
FIG. 5 is a flowchart showing an abnormality determination method for the secondary battery module 1 according to the first embodiment.

  The sensor value acquisition unit 101 of the BMU 16 acquires a voltage value, a current value, a cell temperature, and an ambient temperature from the CMU 13 and the ambient temperature sensor 15 (step S1). Next, the charging rate estimation unit 102 estimates the charging rate of the cell battery 12 based on the current value or voltage value acquired by the sensor value acquisition unit 101 (step S2).

Next, the internal resistance specifying unit 104 reads out the internal resistance value associated with the charging rate estimated by the charging rate estimation unit 102 and the cell temperature acquired by the sensor value acquisition unit 101 from the internal resistance storage unit 103 (step) S3).
Next, the temperature range specifying unit 105 specifies a temperature range that is monotonously non-decreasing with respect to the internal resistance specified by the internal resistance specifying unit 104 (step S4).
Further, the determination time specifying unit 106 specifies the determination time for monotonously non-decreasing with respect to the internal resistance specified by the internal resistance specifying unit 104 (step S5).

  Next, the temperature calculation unit 107 reads the cell temperature associated with the current time from the calculated temperature storage unit 108 (step S6). Next, the temperature calculation unit 107 calculates the ambient temperature and current value acquired by the sensor value acquisition unit 101, the internal resistance value specified by the internal resistance specifying unit 104, and the cell temperature read from the calculated temperature storage unit 108 using the formula (1). ) To calculate the cell temperature after the calculation period ΔT has elapsed (step S7). Next, the temperature calculation unit 107 records the calculated cell temperature in the calculated temperature storage unit 108 in association with the time obtained by adding the calculation period ΔT to the current time (step S8).

  Next, the difference calculation unit 109 calculates an absolute difference between the cell temperature at the current time read by the temperature calculation unit 107 in step S6 and the cell temperature acquired by the sensor value acquisition unit 101 (step S9). Next, the determination unit 110 determines whether or not the absolute difference value calculated by the difference calculation unit 109 exceeds the temperature range specified by the temperature range specifying unit 105 (step S10).

  When the determination unit 110 determines that the difference absolute value calculated by the difference calculation unit 109 exceeds the temperature range specified by the temperature range specification unit 105 (step S10: YES), the difference absolute value exceeds the temperature range. It is determined whether or not the time measuring unit 111 has timed the duration of the recorded state (step S11). If the determination unit 110 determines that the time measurement unit 111 has not timed the duration of the state in which the difference absolute value exceeds the temperature range (step S11: NO), the determination unit 110 starts time measurement by the time measurement unit 111 (step S12). The process returns to step S1.

On the other hand, when the determination unit 110 determines that the time measurement unit 111 is measuring the duration of the state where the difference absolute value exceeds the temperature range (step S11: YES), the time duration measured by the time measurement unit 111 is: It is determined whether it is more than the determination time specified by the determination time specifying unit 106 (step S13). If the determination unit 110 determines that the duration time counted by the time measuring unit 111 is less than the determination time specified by the determination time specifying unit 106 (step S13: NO), the process returns to step S1. This is because the difference absolute value may accidentally exceed the temperature range due to an error in the sensor value or the like.
On the other hand, when determining unit 110 determines that the duration time counted by timer unit 111 is equal to or longer than the determination time specified by determination time specifying unit 106 (step S13: YES), there is an abnormality in secondary battery module 1. Is determined (step S14), and the process is terminated.

  On the other hand, when the determination unit 110 determines in step S10 that the difference absolute value calculated by the difference calculation unit 109 does not exceed the temperature range specified by the temperature range specifying unit 105 (step S10: NO), the difference absolute It is determined whether or not the time measuring unit 111 is measuring the duration of the state where the value exceeds the temperature range (step S15). The determination part 110 returns a process to step S1, when it determines with the time measuring part 111 not measuring the continuation time in the state where the difference absolute value exceeded the temperature range (step S15: NO). On the other hand, when the determination unit 110 determines that the time counting unit 111 is measuring the duration of the state in which the absolute difference value exceeds the temperature range (step S15: YES), the time duration measured by the time measuring unit 111 is Is reset to stop timing (step S16), and the process returns to step S1.

Here, when the difference between the cell temperature (actual value) acquired by the sensor value acquisition unit 101 and the cell temperature (theoretical value) calculated by the temperature calculation unit 107 is large, it is determined that the secondary battery module 1 is abnormal. Explain why.
When the secondary battery module 1 is normal, the relationship among the cell temperature, current value, ambient temperature, and internal resistance satisfies the formula (1). Therefore, even if there is a measurement error of the sensor, the difference between the measured value and the theoretical value of the cell temperature is a small value. On the other hand, when there is abnormal heat generation in the cell battery 12, the measured value of the cell temperature is larger than the theoretical value. The abnormal heat generation of the cell batteries 12 includes, for example, heat generation due to arc discharge caused by poor contact of bus bars connecting the cell batteries 12, heat generation due to deterioration of the cell batteries 12, and the like. In addition, when a sensor (current sensor, voltage sensor) or an ambient temperature sensor 15 for measuring a physical quantity related to charging / discharging provided in the cell battery 12 fails, the cell temperature calculated by the temperature calculation unit 107 is not an accurate value. The difference between the theoretical value of the cell temperature and the actually measured value of the cell temperature becomes large. Further, when the temperature sensor provided in the cell battery 12 fails, the measured value of the cell temperature is not an accurate value, so that the difference between the theoretical value of the cell temperature and the measured value becomes large.
Thus, according to the present embodiment, the BMU 16 can determine whether there is an abnormality in the secondary battery module 1 including the cell battery 12 and peripheral devices.

  In the present embodiment, the case where the difference calculation unit 109 calculates the absolute value of the difference between the measured value of the cell temperature and the theoretical value of the cell temperature has been described, but the present invention is not limited to this. For example, the difference calculation unit 109 may calculate a value obtained by subtracting the theoretical value of the cell temperature from the actual measurement value of the cell temperature. In this case, the temperature range specifying unit 105 can obtain the same effect as the present embodiment by specifying a temperature range in which the lower limit value is a negative value and the upper limit value is a positive value. On the other hand, in another embodiment, the determination unit 110 may perform the abnormality determination only when the measured value of the cell temperature is higher than the predicted value. This is because when the measured value of the cell temperature is lower than the predicted value, the cell battery 12 does not generate heat, and the necessity for abnormality determination is low.

  Moreover, although the temperature calculation part 107 demonstrated the case where the temperature calculation part 107 calculated the theoretical value of cell temperature based on the atmospheric temperature acquired from the atmospheric temperature sensor 15 in this embodiment, it is not restricted to this. For example, the temperature calculation unit 107 calculates the theoretical value of the cell temperature using a fixed ambient temperature if the ambient temperature is always kept constant by the air conditioner provided outside the secondary battery module 1. May be. In this case, the secondary battery module 1 may not include the ambient temperature sensor 15.

  In other embodiments, the determination unit 110 may not perform abnormality determination depending on the charging rate of the secondary battery and the range of the actually measured temperature. For example, when the internal resistance value specified by the internal resistance specifying unit 104 is not within a predetermined range, the determining unit 110 may not perform the abnormality determination. This is because in a region where the internal resistance of the secondary battery is large, heat generation is large and calculation errors are likely to occur.

  Moreover, although this embodiment demonstrated the case where a temperature range and determination time monotonously non-decrease with respect to an internal resistance value, it is not restricted to this. For example, the temperature range or the determination time may be monotonously non-decreasing to the current value. This is because the higher the current value, the more heat generated in the secondary battery, and the more likely it is that a calculation error with the measured battery temperature will occur.

<< Second Embodiment >>
Next, a second embodiment will be described.
The secondary battery module 1 according to the second embodiment is different from the first embodiment in the operation of the BMU 26.

FIG. 6 is a schematic block diagram showing the configuration of the BMU 26 according to the second embodiment.
The BMU 26 according to the second embodiment further includes an air blowing determination unit 212 and a heat transfer coefficient determination unit 213 in addition to the configuration of the first embodiment. Further, the BMU 26 according to the second embodiment differs from the first embodiment in the operation of the temperature calculation unit 207.

The air blowing determination unit 212 determines whether or not the air blowing fan 14 is operating. The blower fan 14 is switched between operation and non-operation by the BMU 26 according to the temperature of the cell battery 12. The BMU 26 operates the blower fan 14 when the temperature of any one of the cell batteries 12 exceeds a predetermined threshold (for example, 35 degrees Celsius). That is, the blower fan 14 operates only when the necessity for cooling is high. This is because the life of the blower fan 14 is determined by the operation time. Moreover, this is because auxiliary power loss occurs due to the operation of the blower fan 14.
Since the efficiency of heat exchange varies depending on the flow velocity, the efficiency of heat exchange using air varies depending on whether or not the blower fan 14 is operating.

  The heat transfer coefficient determination unit 213 determines the heat transfer coefficient H of Expression (1) based on the determination result by the air blowing determination unit 212. Specifically, the heat transfer coefficient Hon when the blower fan 14 is operating and the heat transfer coefficient Hoff when the blower fan 14 is not operating are measured in advance by experiments or the like. The heat transfer coefficient determination unit 213 determines the heat transfer coefficient H as the heat transfer coefficient Hon when the blower determination unit 212 determines that the blower fan 14 is operating. On the other hand, the heat transfer coefficient determination unit 213 determines the heat transfer coefficient H to be the heat transfer coefficient Hoff when the blow determination unit 212 determines that the blower fan 14 is not operating.

The temperature calculation unit 207 calculates the cell temperature using the heat transfer coefficient determined by the heat transfer coefficient determination unit 213 as the heat transfer coefficient H of the equation (1).
Thereby, BMU26 concerning this embodiment can predict the temperature of cell battery 12 more correctly. Therefore, the BMU 26 can determine the failure of the secondary battery module 1 with high accuracy.

<< Third Embodiment >>
FIG. 7 is a schematic block diagram showing the configuration of the BMU 36 according to the third embodiment.
The BMU 36 according to the third embodiment further includes an internal resistance calculation unit 314 and a resistance deterioration coefficient calculation unit 315 in addition to the configuration of the first embodiment. Further, the BMU 36 according to the third embodiment is different from the first embodiment in the operation of the internal resistance specifying unit 304.

  The internal resistance calculation unit 314 calculates the internal resistance value of the cell battery 12 based on the current value or voltage value obtained when the current value or voltage value acquired by the sensor value acquisition unit 101 is equal to or less than a predetermined rate of change. . For example, the internal resistance calculation unit 314 determines that the cell battery 12 is in a static state when the variance of the change in the current value acquired by the sensor value acquisition unit 101 during a predetermined time (for example, 1 second) is smaller than the predetermined value. Judge that there is. The internal resistance calculation unit 314 records the voltage value and current value of the cell battery 12 in a static state in a storage unit (not shown). The internal resistance calculation unit 314 calculates the internal resistance value of the cell battery 12 based on the difference between the voltage value and the current value recorded at different times in the storage unit.

  The resistance deterioration coefficient calculation unit 315 calculates a ratio between the internal resistance value calculated by the internal resistance calculation unit 314 and the internal resistance value read by the internal resistance specifying unit 304 from the internal resistance storage unit 103 as a resistance deterioration coefficient. The internal resistance value calculated by the internal resistance calculation unit 314 is an internal resistance value reflecting the deterioration of the cell battery 12. On the other hand, the internal resistance value stored in the internal resistance storage unit 103 is an internal resistance value when the cell battery 12 is not deteriorated. Therefore, the resistance deterioration coefficient calculation unit 315 can calculate the resistance deterioration coefficient by taking the ratio between the internal resistance value reflecting the deterioration and the internal resistance value when there is no deterioration.

  The internal resistance specifying unit 304 calculates an internal resistance value reflecting the deterioration by multiplying the internal resistance value read from the internal resistance storage unit 103 by the resistance deterioration coefficient calculated by the resistance deterioration coefficient calculating unit 315. Can do.

The internal resistance calculation unit 314 cannot calculate the internal resistance value of the cell battery 12 unless the cell battery 12 is in a specific operation state. The specific operation state is, for example, a case where a steep charge / discharge current is generated and the resistance DCR = ΔV / ΔI can be obtained from the voltage change ΔV and the current change ΔI at that time.
However, according to the present embodiment, by using the resistance deterioration coefficient γ calculated by the resistance deterioration coefficient calculating unit 315, the internal resistance specifying unit 304 can determine whether the cell battery 12 is in a specific operation state or not. The internal resistance value can be specified as a value of DCR × γ in consideration of deterioration.
As described above, when the resistance deterioration coefficient γ is known, the DCR _{(t) in} the equation (1) can be corrected to DCR _(t) × γ, and the DCR in the equation (2) can be corrected to DCR × γ. Thereby, the BMU 36 according to the present embodiment can predict the temperature of the cell battery 12 more accurately. Therefore, the BMU 36 can determine the failure of the secondary battery module 1 with high accuracy.
When the deterioration is not regarded as an abnormality of the cell battery 12, the above-described correction is performed. However, when the deterioration is regarded as an abnormality, the internal resistance specifying unit 204 may not perform the above correction.

<< Fourth Embodiment >>
FIG. 8 is a schematic block diagram showing the configuration of the BMU 46 according to the fourth embodiment.
The BMU 46 according to the fourth embodiment further includes an allowable current calculation unit 416 and a presentation unit 417 in addition to the configuration of the first embodiment. In addition, BMU46 which concerns on 4th Embodiment is an example of an abnormality determination apparatus, and is also an example of a charging / discharging information presentation apparatus.

Based on the ambient temperature acquired by the sensor value acquisition unit 101 and the internal resistance specified by the internal resistance specifying unit 104, the allowable current calculation unit 416 calculates an allowable current value that is a current at which the cell temperature becomes a predetermined abnormality determination temperature. calculate. The abnormality determination temperature is a temperature at which the cell battery 12 is determined to be abnormal.
Specifically, the allowable current calculation unit 416 calculates the allowable current value based on Expression (3).
When the abnormality determination temperature Tsinh is equal to or lower than the ambient temperature T∞ (Tsinh−T∞ ≦ 0), the allowable current calculation unit 416 sets the allowable current to 0 A regardless of the equation (3). In the present embodiment, the allowable current calculation unit 416 is an example of a physical quantity calculation unit.

  Imax is an allowable current. Expression (3) is an expression obtained by substituting the abnormality determination temperature Tsinh for the battery temperature Ts of Expression (2) and substituting 0 for the temperature change amount dTs / dt. When the resistance deterioration coefficient γ is known as in the third embodiment, the DCR in Expression (3) may be corrected to DCR × γ. When the deterioration is not regarded as an abnormality of the cell battery 12, the above-described correction is performed. However, when the deterioration is regarded as an abnormality, the allowable current calculation unit 416 may not perform the above correction.

The presentation unit 417 presents information based on the allowable current value calculated by the allowable current calculation unit 416. Specifically, the presentation unit 417 gives the user of the secondary battery module 1 a current value related to charging / discharging of the secondary battery module 1 below the allowable current value calculated by the allowable current calculation unit 416. Present a notice to limit. In addition, the presentation unit 417 presents a warning when the time during which the difference between the current value acquired by the sensor value acquisition unit 101 and the allowable current value exceeds the temperature range continues for the determination time or longer.
In the present embodiment, the case where the allowable current calculation unit 416 calculates the allowable current value that is the current that becomes the abnormality determination temperature has been described, but the present invention is not limited thereto. For example, instead of the allowable current calculation unit 416, an allowable voltage calculation unit that calculates an allowable voltage value that is a voltage that becomes the abnormality determination temperature may be provided.

  As described above, the embodiment has been described in detail with reference to the drawings. However, the specific configuration is not limited to that described above, and various design changes and the like can be made.

FIG. 9 is a schematic block diagram illustrating a configuration of a computer 900 according to at least one embodiment.
The computer 900 includes a CPU 901, a main storage device 902, an auxiliary storage device 903, and an interface 904.
The above-described BMU is implemented in the computer 900. The operation of each processing unit described above is stored in the auxiliary storage device 903 in the form of a program. The CPU 901 reads a program from the auxiliary storage device 903, develops it in the main storage device 902, and executes the above processing according to the program. Further, the CPU 901 secures a storage area corresponding to each of the above-described storage units in the main storage device 902 according to the program.

  In at least one embodiment, the auxiliary storage device 903 is an example of a tangible medium that is not temporary. Other examples of the tangible medium that is not temporary include a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, and a semiconductor memory connected via the interface 904. When this program is distributed to the computer 900 via a communication line, the computer 900 that has received the distribution may develop the program in the main storage device 902 and execute the above processing.

  The program may be for realizing a part of the functions described above. Further, the program may be a so-called difference file (difference program) that realizes the above-described function in combination with another program already stored in the auxiliary storage device 903.

  In other embodiments, some or all of the functions described above may be executed by a dedicated integrated circuit instead of the CPU 901.

  DESCRIPTION OF SYMBOLS 1 ... Secondary battery module 11 ... Case 12 ... Cell battery 13 ... CMU 14 ... Blower fan 15 ... Ambient temperature sensor 16 ... BMU 101 ... Sensor value acquisition part 102 ... Charge rate estimation part 103 ... Internal resistance memory | storage part 104 ... Internal Resistance specifying unit 105 ... Temperature range specifying unit 106 ... Determination time specifying unit 107 ... Temperature calculation unit 108 ... Calculated temperature storage unit 109 ... Difference calculation unit 110 ... Determination unit 111 ... Time measuring unit 26 ... BMU 207 ... Temperature calculation unit 212 ... Blower Determination unit 213 ... Heat transfer coefficient determination unit 36 ... BMU 304 ... Internal resistance specifying unit 314 ... Internal resistance calculation unit 315 ... Resistance degradation coefficient calculation unit 46 ... BMU 416 ... Allowable current calculation unit 417 ... Presentation unit 900 ... Computer 901 ... CPU 902 ... Main storage device 903 ... Auxiliary storage device 904 ... Interface

Claims (14)

A temperature calculation unit that calculates a temperature of the cell battery based on a physical quantity related to electricity charged and discharged by a cell battery included in the secondary battery module;
Based on the measured temperature or charging rate of the cell batteries in the cell batteries, the cells measured temperature or determine the internal resistance of the cell batteries in the battery, the temperature of the internal resistance value identifies a widens the temperature range as large A range identification part;
A determination unit that determines that the secondary battery module is abnormal when the difference between the temperature calculated by the temperature calculation unit and the measured temperature of the cell battery exceeds the temperature range specified by the temperature range specification unit;
An abnormality determination device comprising: A temperature calculation unit that calculates a temperature of the cell battery based on a physical quantity related to electricity charged and discharged by a cell battery included in the secondary battery module;
Based on the measured temperature or charging rate of the cell batteries in the cell batteries, and the cell obtains the internal resistance value of the battery, identifying the higher the internal resistance value becomes larger the longer decision time determination time specifying unit,
When the state where the difference between the temperature calculated by the temperature calculation unit and the measured temperature of the cell battery exceeds a predetermined temperature range continues for the determination time specified by the determination time specifying unit, the secondary battery module is A determination unit that determines that an abnormality is present;
An abnormality determination device comprising: An internal resistance storage unit that associates and stores the temperature of the cell battery and the charging rate of the cell battery provided in the secondary battery module , and the internal resistance value of the cell battery ;
An internal resistance calculation unit that calculates an internal resistance value of the cell battery based on a physical quantity related to the electricity of the cell battery when a physical quantity related to the electricity of the cell battery becomes a predetermined change rate or less;
The measured temperature and the cell battery of the cell batteries and resistance deterioration coefficient calculating portion to which the internal resistance storage unit and the internal resistance value in which the internal resistance calculation unit has calculated to calculate the ratio of the internal resistance value stored as the resistance deterioration coefficient A temperature calculation unit that calculates the temperature of the cell battery based on a value obtained by multiplying the internal resistance value associated with a charging rate by the resistance deterioration coefficient and a physical quantity related to electricity that the cell battery charges and discharges;
A determination unit that determines that the secondary battery module is abnormal when the difference between the temperature calculated by the temperature calculation unit and the measured temperature of the cell battery exceeds a predetermined temperature range;
An abnormality determination device comprising: Based on the ambient temperature of the secondary battery module, a physical quantity calculation unit that calculates a physical quantity related to the charging / discharging so that the temperature of the cell battery becomes a predetermined abnormality determination temperature;
A presentation unit for presenting information based on the physical quantity calculated by the physical quantity calculation unit;
The abnormality determination device according to any one of claims 1 to 3 , further comprising: The abnormality determination device according to claim 4 , wherein the presenting unit presents a warning when a difference between a physical quantity related to charging / discharging of the cell battery and a physical quantity calculated by the physical quantity calculating unit exceeds a predetermined range. The temperature calculation unit, release of the temperature change amount of the secondary battery module, to an atmosphere of heating value and the secondary battery module determined by the physical quantity of electricity according to the charging and discharging of the internal resistance and the cell battery of the cell battery The abnormality determination device according to any one of claims 1 to 5 , wherein the temperature of the secondary battery module is calculated based on an expression indicating a relationship with a difference in heat amount. Based on the ambient temperature of the secondary battery module, a physical quantity calculation unit that calculates a physical quantity related to charging and discharging of the cell battery such that the temperature of the cell battery included in the secondary battery module becomes a predetermined abnormality determination temperature;
A presentation unit for presenting information based on the physical quantity calculated by the physical quantity calculation unit;
With
The physical quantity calculation unit is configured to calculate a difference between a heat generation amount determined by a temperature change amount of the secondary battery module, an internal resistance value of the cell battery , and a physical quantity of electricity related to charge / discharge, and a heat dissipation amount to the atmosphere of the secondary battery module. A charge / discharge information presentation device that calculates a physical quantity related to the charge / discharge based on an expression indicating a relationship. A secondary battery module comprising a plurality of the cell batteries and the abnormality determination device according to any one of claims 1 to 6 . An abnormality determination method for determining whether or not a secondary battery module including a cell battery is abnormal,
Calculating a temperature of the cell battery based on a physical quantity related to electricity charged and discharged by the cell battery ;
A step based on the measured temperature or charging rate of the cell batteries in the cell batteries, determine the internal resistance of the cell batteries, to identify widens the temperature range as the internal resistance value increases,
Determining that the secondary battery module is abnormal when the difference between the calculated temperature and the measured temperature of the cell battery exceeds the specified temperature range;
An abnormality determination method having: An abnormality determination method for determining whether or not a secondary battery module including a cell battery is abnormal,
Calculating a temperature of the cell battery based on a physical quantity related to electricity charged and discharged by the cell battery ;
A step of the cell based on the measured temperature or charging rate of the cell batteries in the battery, determine the internal resistance of the cell batteries, identifying the higher the internal resistance value becomes larger the longer the determination period,
Determining that the secondary battery module is abnormal when the difference between the calculated temperature and the measured temperature of the cell battery exceeds a predetermined temperature range for a specified determination time or longer. ,
An abnormality determination method having: An abnormality determination method for determining whether or not a secondary battery module including a cell battery is abnormal,
An internal resistance calculation unit that calculates an internal resistance value of the cell battery based on a physical quantity related to the electricity of the cell battery when a physical quantity related to the electricity of the cell battery becomes a predetermined change rate or less;
Resistance and the charging rate of the temperature and the cell battery of the cell batteries, the internal resistance internal resistance storage unit stores that associates and stores the internal resistance of the cell batteries, the ratio of the internal resistance value the calculated to a physical quantity step and the cell actually measured temperature and the cell batteries and a value obtained by multiplying the resistance deterioration coefficient to the internal resistance value associated with the charging rate of the cell battery of the battery is calculated as the deterioration coefficient is related to the electric charging and discharging Calculating the temperature of the cell battery based on:
Determining that the secondary battery module is abnormal when the difference between the calculated temperature and the measured temperature of the cell battery exceeds a predetermined temperature range;
An abnormality determination method having: Computer
A temperature calculation unit that calculates the temperature of the cell battery based on a physical quantity related to electricity charged and discharged by the cell battery included in the secondary battery module;
The cell based on the measured temperature or charging rate of the cell batteries in the battery, determine the internal resistance of the cell batteries, the temperature range identifying unit for identifying a widens the temperature range as the internal resistance value increases,
A determination unit that determines that the secondary battery module is abnormal when the difference between the temperature calculated by the temperature calculation unit and the measured temperature of the cell battery exceeds the temperature range specified by the temperature range specification unit;
Program to function as. Computer
A temperature calculation unit that calculates the temperature of the cell battery based on a physical quantity related to electricity charged and discharged by the cell battery included in the secondary battery module;
The cell based on the measured temperature or charging rate of the cell batteries in the battery, the cells determine the internal resistance of the battery, determining the time specifying unit for specifying the higher the internal resistance value becomes larger the longer the determination period,
When the state where the difference between the temperature calculated by the temperature calculation unit and the measured temperature of the cell battery exceeds a predetermined temperature range continues for the determination time specified by the determination time specifying unit, the secondary battery module is A program for functioning as a determination unit that determines that there is an abnormality. Computer
Internal resistance storage unit that associates and stores the temperature and the charging rate of the cell battery cell battery provided in the battery module, and an internal resistance of the cell batteries,
An internal resistance calculation unit that calculates an internal resistance value of the cell battery based on a physical quantity related to the electricity of the cell battery when the physical quantity related to the electricity of the cell battery becomes a predetermined change rate or less;
A resistance deterioration coefficient calculation unit that calculates a ratio of the internal resistance value calculated by the internal resistance calculation unit and the internal resistance value stored by the internal resistance storage unit as a resistance deterioration coefficient;
Temperature of the cell batteries based on the physical quantity measured temperature and the cell battery and a value obtained by multiplying the resistance deterioration coefficient to the internal resistance value associated with the charging rate of the cell battery of the cell battery according to the electric charging and discharging A temperature calculation unit for calculating
A program for functioning as a determination unit that determines that the secondary battery module is abnormal when the difference between the temperature calculated by the temperature calculation unit and the measured temperature of the cell battery exceeds a predetermined temperature range.

Images