JP6174963B2 - Battery control system - Google Patents

Description

  The present invention relates to a battery control system that controls a current flowing in a secondary battery.

  Battery systems installed in electric vehicles (EV), plug-in hybrid vehicles (PHEV), and hybrid vehicles (HEV) include secondary batteries connected in series or in parallel, and on / off of the electrical connection between the secondary battery and the load. It consists of electrical parts such as a switch and a current sensor for controlling the current. The battery system includes a battery control system that limits a current flowing from a secondary battery to a load such as a motor when transient use of the battery system is detected. By providing such a battery control system, it is possible to avoid the secondary battery and various components constituting the battery system from deviating from thermal restrictions, and to suppress a decrease in output due to deterioration of the secondary battery. ing.

  As a current limiting method for such a battery system, the current value detected by the current detector is squared, and the current value is integrated according to a time series to calculate a current square integrated value. Based on the current square integrated value, Specifically, when the current square integrated value exceeds a predetermined threshold, the output limit value is transmitted to the controller that controls the current flowing through the load such as a motor, and the current flowing from the battery to the inverter is limited. A technique is known (see, for example, Patent Document 1).

JP 2006-149181 A

  By the way, when the battery system is actually used, how the battery is used varies depending on the user. However, in the technique described in Patent Document 1, the current limit value is determined based on a predetermined load pattern. For this reason, if the load pattern input to the battery system during actual use is higher or lower than the predefined load pattern, limiting the current flowing through the battery system with the predefined current limit value will result in an excessive or excessive May limit current. As a result, there is a problem that the battery system deviates from thermal restrictions and the energy of the secondary battery cannot be fully utilized.

According to a first aspect of the present invention , a current detection unit that detects a current of a capacitor, a temperature detection unit that detects a temperature of the capacitor, and a current value based on a history of the current and temperature of the capacitor in a predetermined time window A control unit that performs limit control to limit the current of the battery so as not to exceed the limit value, and the control unit is configured to control the temperature change in a predetermined time window within a predetermined range. The current is limited by the first current limit value that has already been set, and if the change in temperature in the predetermined time window is outside the predetermined range, the first current limit value is changed to a different second current limit value. When the current is limited by the second current limit value after the setting change and the first current limit value is changed to the second current limit value and the change in temperature exceeds a predetermined range, the second current limit value is set. The value is smaller than the first current limit value And then, if a change in the temperature is below the predetermined range, characterized by a second current limit value greater than the first current limit value.
According to a second aspect of the present invention, a current detection unit that detects a current of a capacitor, a temperature detection unit that detects a temperature of the capacitor, and a current value based on a history of the current and temperature of the capacitor in a predetermined time window A control unit that performs limit control to limit the current of the capacitor so as not to exceed the limit value, and the control unit is already set when the temperature change in the predetermined time window is within the predetermined range. When the current is limited by the first current limit value and the temperature change in the predetermined time window is outside the predetermined range, the first current limit value is set to a different second current limit value, and the first (2) A battery control system that limits a current by a current limit value, wherein the predetermined time window includes a plurality of time windows having different time widths, the predetermined range is set for each of the plurality of time windows, and the control unit includes: Temperature in each of multiple time windows The change is compared with a corresponding predetermined range, it is determined whether the temperature change is within the predetermined range or outside the predetermined range, and the current is limited by the first current limit value or the second current limit value based on the determination result It is characterized by doing.
According to a third aspect of the present invention, a current detection unit that detects a current of a capacitor, a temperature detection unit that detects a temperature of the capacitor, and a current value based on a history of the current and temperature of the capacitor in a predetermined time window A control unit that performs limit control to limit the current of the capacitor so as not to exceed the limit value, and the control unit is already set when the temperature change in the predetermined time window is within the predetermined range. When the current is limited by the first current limit value and the temperature change in the predetermined time window is outside the predetermined range, the first current limit value is set to a different second current limit value, and the first 2 A battery control system that limits a current by a current limit value, wherein the control unit calculates a calorific value of the capacitor based on an internal resistance of the capacitor and a current detected by the current detector as a current history, Calculated calorific value and And performing limitation control based on the change in the degree.
According to a fourth aspect of the present invention, a current detection unit that detects a current of a capacitor, a temperature detection unit that detects a temperature of the capacitor, and a current value based on a history of the current and temperature of the capacitor in a predetermined time window A control unit that performs limit control to limit the current of the capacitor so as not to exceed the limit value, and the control unit is already set when the temperature change in the predetermined time window is within the predetermined range. When the current is limited by the first current limit value and the temperature change in the predetermined time window is outside the predetermined range, the first current limit value is set to a different second current limit value, and the first 2 A battery control system that limits a current by a current limit value, and includes a duty ratio detection unit that detects a duty ratio as a ratio of current application time in a predetermined time window, and the control unit detects the duty ratio detection unit Dut And wherein varying the first and second current limit value on the basis of the ratio.
The battery control system according to the fifth aspect of the present invention is based on a current detector that detects the current of the battery, a temperature detector that detects the temperature of the battery, and a history of the current and temperature of the battery in a predetermined time window. A control unit that performs limit control to limit the change in the amount of power of the battery, and the control unit calculates the heat generation amount of the battery based on the internal resistance of the battery and the current detected by the current detector as a current history. The limiting control is performed based on the calculation result of the calorific value of the battery and the temperature history.
The battery control system according to the sixth aspect of the present invention is based on a current detection unit that detects the current of the battery, a temperature detection unit that detects the temperature of the battery, and a history of the current and temperature of the battery in a predetermined time window. A control unit that performs limit control to limit a change in the amount of power of the battery, and a duty ratio detection unit that detects a duty ratio as a ratio of a current application time in a predetermined time window, and the control unit includes a duty ratio detection unit The amount of electric power is changed based on the duty ratio detected by.

  According to the present invention, an appropriate current limit value can be set according to the actual use state of the battery system.

FIG. 1 is a diagram for explaining a battery system mounted on a plug-in hybrid vehicle. FIG. 2 is a block diagram showing a circuit configuration of the unit cell control unit 121. FIG. 3 is a block diagram showing the assembled battery control unit 150. FIG. 4 is a block diagram showing the current limit value determination unit 151. FIG. 5 is a diagram illustrating an example of the current limiting characteristic stored in the storage unit 180. FIG. 6 is a diagram illustrating time windows TW1 to TWn. FIG. 7 is a diagram illustrating an example of a data table of current limiting characteristics. FIG. 8 is a block diagram showing the processing contents of the calorific value calculation unit 1511. Figure 9 is a diagram illustrating a calorific value _Q TW1 _{to Q TW4} per time window TW1～TW4. FIG. 10 is a block diagram showing the current limit value correction determination unit 1512. FIG. 11 is a diagram illustrating a temperature change for each time window. FIG. 12 is a block diagram showing the current limit value calculation unit 1513. FIG. 13 is a diagram illustrating a current limit value correction process. FIG. 14 is a block diagram showing the power limit calculation unit 153. FIG. 15 is a flowchart illustrating an example of the current limiting operation and the current limiting characteristic correcting operation. FIG. 16 is a flowchart illustrating an example of the current limit value correction process in step S140. FIG. 17 shows the current (line L50, line L51), temperature (line L52), and effective current (or average current) in the time window Tw1 (line L53, line) of the assembled battery 110 during charging and discharging in the first embodiment. It is a figure which shows transition of L54). FIG. 18 is a block diagram showing an assembled battery control unit 150A in the second embodiment. FIG. 19 is a block diagram showing the power amount limiting coefficient determination unit 154. As shown in FIG. FIG. 20 is a diagram illustrating an example of the definition of electric energy. FIG. 21 is a block diagram showing the power amount limiting unit 155. As shown in FIG. FIG. 22 is a diagram illustrating changes in temperature (line L61), state of charge (SOC) (line L62), and electric energy (line L63) during charging / discharging of the assembled battery 110 according to the second embodiment. FIG. 23 is a diagram for explaining the definition of the duty ratio and the current limiting characteristic according to the duty ratio. FIG. 24 is a block diagram showing the current limit value determining unit 151B.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the embodiment described below, a case where the present invention is applied to a power storage device of a plug-in hybrid vehicle (PHEV) will be described as an example. The configuration of the embodiment described below can also be applied to a storage device control circuit of a power storage device that constitutes a power source for an industrial vehicle such as a passenger vehicle such as a hybrid vehicle (HEV) or an electric vehicle (EV) or a hybrid railway vehicle.

  In the following, a case where a lithium ion battery is applied to a capacitor constituting the power storage unit will be described as an example. However, as the capacitor, a nickel metal hydride battery, a lead battery, an electric double layer capacitor, a hybrid capacitor, etc. are used. You can also.

-First embodiment-
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram for explaining a battery system mounted on a plug-in hybrid vehicle.

  The battery system 10 including the assembled battery 110 is connected to the inverter 400 via the switches 300 and 310 and is connected to the charger 420 via the switches 320 and 330. Inverter 400 and charger 420 are controlled by vehicle control unit 200.

  While the vehicle is traveling, the battery system 10 is connected to the inverter 400, and the motor generator 410 is driven by the energy stored in the assembled battery 110. During vehicle braking, the motor generator 410 functions as a generator, and the three-phase AC power output from the motor generator 410 is converted into DC power by the inverter 400 to charge the assembled battery 110 provided in the battery system 10. Used. When charging, the battery system 10 is connected to the charger 420, and the assembled battery 110 is charged by supplying power from a household power supply or a desk lamp.

(Configuration of battery system 10)
The battery system 10 includes an assembled battery 110 and a battery control system 100 that monitors and controls the state of the assembled battery 110. The battery control system 100 includes a single battery management unit 120, a current detection unit 130, a voltage detection unit 140, an assembled battery control unit 150, and a storage unit 180. The assembled battery 110 includes a plurality of single cells 111. The unit cell management unit 120 monitors the state of the unit cells 111 constituting the assembled battery 110. The current detection unit 130 detects a current flowing through the battery system 10. The voltage detection unit 140 detects the total voltage of the assembled battery 110. The assembled battery control unit 150 controls the assembled battery 110. The storage unit 180 stores information regarding battery characteristics of the assembled battery 110, the single battery 111, and the single battery group 112.

  The assembled battery 110 is configured by electrically connecting a plurality of unit cells 111 (lithium ion batteries) capable of storing and releasing electrical energy (charging and discharging DC power) in series. The output voltage of the unit cell 111 is, for example, 3.0 to 4.2 V (average output voltage: 3.6 V). Of course, other voltage specifications may be used.

  The assembled battery 110 includes a plurality of unit cells 111 that are electrically connected in series. The plurality of single cells 111 constituting the assembled battery 110 are grouped into a plurality of single cell groups 112 including a predetermined number of single cells 111 for convenience of managing and controlling the battery state. The unit cell group 112 may be equally divided by a predetermined unit number such as 1, 4, 6,..., Or the unit cell groups 112 and 6 each including four unit cells 111. There is a case where the composite section is combined with a unit cell group 112 composed of individual unit cells 111.

  In this embodiment, in order to simplify the description, the assembled battery 110 includes two unit cell groups 112a and 112b formed by electrically connecting four unit cells 111 in series. It is configured to be connected in series and includes a total of eight unit cells 111.

  The unit cell management unit 120 includes a plurality of unit cell control units 121, and one unit cell control unit 121 is assigned to the unit cell group 112 grouped as described above. The unit cell control unit 121 operates by receiving power from the allocated unit cell group 112, and monitors and controls the state of the unit cells 111 constituting the unit cell group 112. In the example shown in FIG. 1, the single cell management unit 120 is provided with two single cell control units 121a and 121b corresponding to the two single cell groups 112a and 112b.

  The assembled battery control unit 150 is transmitted from the voltage detection unit 140, the battery voltage and temperature of the single cell 111 transmitted from the single cell management unit 120, the current value flowing through the battery system 10 transmitted from the current detection unit 130, and the voltage detection unit 140. The total voltage value of the assembled battery 110 is input. The assembled battery control unit 150 detects the state of the assembled battery 110 based on the input information. The result of the process performed by the assembled battery control unit 150 is transmitted to the single cell management unit 120 and the vehicle control unit 200.

  Signal transmission / reception between the assembled battery control unit 150 and the single cell management unit 120 is performed by a signal communication unit 160 provided with an insulating element 170 such as a photocoupler. The insulating element 170 is provided because the operating voltage of the assembled battery control unit 150 and the operating power source of the unit cell management unit 120 are different. The cell management unit 120 operates by receiving power from the assembled battery 110, whereas the assembled battery control unit 150 uses a battery for on-vehicle auxiliary equipment (for example, a 14V battery) as a power source.

  The insulating element 170 may be mounted on a circuit board that constitutes the unit cell management unit 120 or may be mounted on a circuit board that constitutes the assembled battery control unit 150. Depending on the system configuration, the insulating element 170 may be omitted.

  The unit cell control units 121a and 121b described above are connected in series by the signal communication unit 160 in the descending order of potentials of the unit cell groups 112a and 112b monitored by each unit. The signal transmitted by the assembled battery control unit 150 is input to the single cell control unit 121a by the signal communication unit 160 via the insulating element 170. Similarly, the signal communication unit 160 connects between the output of the unit cell control unit 121a and the input of the unit cell control unit 121b, and signals are transmitted.

  The output of the cell control unit 121b is transmitted to the battery pack control unit 150 by the signal communication unit 160 via the insulating element 170. Thus, the assembled battery control unit 150 and the single cell control units 121a and 121b are connected in a loop by the signal communication unit 160. This loop connection may be referred to as a daisy chain connection, a daisy chain connection, or a random connection. In the present embodiment, the unit cell control unit 121a and the unit cell control unit 121b are connected not via the insulating element 170, but may be connected via the insulating element 170.

  The storage unit 180 stores information on current limiting characteristics of the battery system 10 and battery characteristics of the assembled battery 110, the single battery 111, and the single battery group 112. The battery characteristics include, for example, data tables and mathematical formulas describing the relationship between the state of charge (SOC) and open circuit voltage (OCV), the internal resistance characteristics, the polarization resistance characteristics, etc. There are data tables and mathematical formulas describing the correspondence with various parameters. In this embodiment, the storage unit 180 is installed outside the assembled battery control unit 150 and the unit cell management unit 120, but the assembled battery control unit 150 or the unit cell management unit 120 stores the storage unit. The above information may be stored in this configuration.

(Configuration of unit cell control unit 121)
FIG. 2 is a diagram illustrating a circuit configuration of the unit cell control unit 121. The unit cell control unit 121 includes a voltage detection circuit 122, a control circuit 123, a signal input / output circuit 124, and a temperature detection unit 125. The voltage detection circuit 122 measures the voltage between the terminals of each unit cell 111. The temperature detection unit 125 measures the temperature of the cell group 112. The control circuit 123 transmits the measurement results input from the voltage detection circuit 122 and the temperature detection unit 125 to the assembled battery control unit 150 via the signal input / output circuit 124.

  Although not shown because of a well-known configuration, the single cell control unit 121 is generally provided with a circuit for equalizing voltage variations between the single cells 111 caused by self-discharge and current consumption variations. Is done.

  The temperature detection unit 125 provided in the unit cell control unit 121 measures one temperature as the entire unit cell group 112 and treats the temperature as a representative temperature value of the unit cells 111 constituting the unit cell group 112. The temperature measured by the temperature detection unit 125 is used for various calculations for detecting the state of the cell 111, the cell group 112, or the assembled battery 110.

  Note that a temperature detection unit 125 may be provided for each single cell 111 to measure the temperature for each single cell 111, and various calculations may be performed based on the temperature for each single cell 111. However, in this case, the configuration of the unit cell control unit 121 becomes complicated as the number of the temperature detection units 125 increases.

  In FIG. 2, the temperature detection unit 125 is illustrated in a simplified manner, but actually, a temperature sensor is installed on the temperature measurement target, and a voltage as temperature information is output from the temperature sensor. This measurement result is transmitted to the signal input / output circuit 124 via the control circuit 123, and is output to the outside of the unit cell control unit 121 by the signal input / output circuit 124. The unit cell control unit 121 is equipped with a function for realizing this series of flows as a temperature detection unit 125. Note that the voltage detection circuit 122 can also be used to measure temperature information (voltage).

(Configuration of battery pack controller 150)
FIG. 3 is a block diagram illustrating a configuration of the assembled battery control unit 150. The assembled battery control unit 150 includes a current limit value determination unit 151, a battery state detection unit 152, and a power limit calculation unit 153.

  The assembled battery control unit 150 includes the measured values of the battery voltage and temperature of the unit cell 111 output from the unit cell management unit 120, the current value from the current detection unit 130, and the assembled battery 110 output from the voltage detection unit 140. The total voltage value, the battery characteristic information of the cell 111 stored in the storage unit 180, and a current limit value described later are input. In addition, the cell management unit 120 has a function of diagnosing whether the cell 111 is overcharged or overdischarged, and a function of outputting an abnormal signal when a communication error occurs in the cell management unit 120. These diagnosis results and abnormal signals are also input to the battery pack controller 150. Furthermore, a signal is also input from the vehicle control unit 200 which is a host control device.

  The assembled battery control unit 150 is configured to appropriately control charging / discharging of the assembled battery 110 based on the input information and the current limit value stored in advance in the storage unit 180 and the battery characteristics of the unit cell 111. The calculation of the limit value, the calculation of the power limit value, the calculation of the SOC and the deterioration state (SOH: State Of Health) of the unit cell 111, and the calculation for performing the voltage equalization control are executed. The assembled battery control unit 150 outputs these calculation results and instructions based on the calculation results to the unit cell management unit 120 and the vehicle control unit 200.

(Detailed description of the current limit value determination unit 151)
The current limit value determination unit 151 illustrated in FIG. 3 will be described in more detail with reference to FIG. FIG. 4 is a block diagram illustrating a configuration of the current limit value determination unit 151. The current limit value determination unit 151 includes a heat generation amount calculation unit 1511, a current limit value correction determination unit 1512, and a current limit value calculation unit 1513.

  The heat generation amount calculation unit 1511 calculates the heat generation amount of the assembled battery 110 or the single battery 111 based on the current detected by the current detection unit 130. The current limit value correction determination unit 1512 determines whether or not the current limit value needs to be corrected based on the heat generation amount calculated by the heat generation amount calculation unit 1511 and the battery temperature detected by the temperature detection unit 125. The current limit value calculation unit 1513 receives the output from the heat generation amount calculation unit 1511 (heat generation amount) and the output from the current limit value correction determination unit 1512 (determination of whether or not the current limit value needs to be corrected). The current limit value calculation unit 1513 corrects the current limit value stored in advance in the storage unit 180 based on the input information, and outputs the corrected current limit value. The corrected current limit value is stored in the storage unit 180 separately from the current limit value stored in advance.

  FIG. 5 shows an example of the current limiting characteristic stored in the storage unit 180. The current limiting characteristic shown in FIG. 5 shows the current limiting value for each time window. The current limit value is a limit value for controlling the current value to a value for suppressing a decrease in output due to deterioration without departing from the thermal restriction of the battery system 10. For example, the average value or effective value of the current that does not deviate from the thermal constraints of the battery system 10 or promote the progress of deterioration is extracted from an experiment or the like in which an arbitrary current waveform is input to the battery system 10 in advance. These are the current limit values. The thermal influence on the battery system 10 and the influence on the deterioration characteristics vary depending on the time during which the current flows. Therefore, in the present embodiment, the current limit value is set according to the time window as shown in FIG.

  FIG. 6 is a diagram for explaining the time windows Tw1 to Twn. In FIG. 6, the time windows Tw1 to Tw4 are shown so as to overlap the time change of the current value indicated by the line L1. The time windows Tw4 to Twn are not shown. The time window defines a time width when data sampling is performed. In the example shown in FIG. 6, time widths (time windows) Tw1 to Tw4 that are traced back to the past with the current time as a base point are related to time T1 and time T2. It is shown. As time elapses, the time widths Tw1 to Tw4 move to the right in the figure, and the sampling data in the time windows Tw1 to Tw4 also change.

  The storage unit 180 stores the current limiting characteristics shown in FIG. 5 as a data table as shown in FIG. Further, instead of the data table, the correspondence between the time window and the current limit value may be expressed by a mathematical expression or the like, and is not limited to the form of the data table. Note that the current limit value may be determined in consideration of not only the thermal restrictions of the assembled battery 110 or the single battery 111 but also the deterioration characteristics of the assembled battery 110 or the single battery 111, the thermal restrictions of the members of the switch 300, and the like. good.

FIG. 8 is a block diagram showing the processing contents of the calorific value calculation unit 1511. Based on the current value I (A) detected by the current detection unit 130 and the internal resistance R (Ω) of the cell 111 stored in the storage unit 180, the heat generation amount calculation unit 1511 In 1), calorific values Q _{Tw1 to} Q _Twn (J) corresponding to the time windows Tw1 to Twn (sec) are calculated.

Calorific value _Q Tw1 _{to Q Twn} calculated by the calorific value calculation unit 1511, the measurement data (i current value Ii to be obtained for each such time window Tw1~Twn 6 were obtained for each sampling period data The sample number is indicated). Each calculation result is output from the calorific value calculation unit 1511. In FIG. 8 and equation (1), the value of the internal resistance is a constant value, but the value of the internal resistance may be changed according to the SOC and temperature to calculate the heat generation amount.

Figure 9 is a diagram illustrating a calorific value _Q Tw1 _{to Q Twn} per time window Tw1～Twn, it illustrates with respect to time windows Tw1～Tw4. A line L2 indicates a change over time in the accumulated value of the heat generation amount. The calorific values Q _{Tw1 to} Q _Tw4 correspond to the calorific values generated in the time windows _{Tw1 to Tw4} .

In the present embodiment, the calorific value is calculated from Equation (1), and in the following description, a method for correcting and determining the current limit value based on the calculated calorific value will be described. However, a parameter that can serve as an index for preventing a reduction in output due to thermal restriction or deterioration is not limited to the amount of heat generated by the formula (1), and for example, the current square of the current flowing through the assembled battery 110 or the single battery 111. The integrated value may be calculated and output from the following formula (2) according to the time window, or the average value of the current flowing through the assembled battery 110 or the single battery 111 may be calculated from the following formula (3) according to the time window. You may calculate and output. Furthermore, it is good also as a structure which calculates and outputs the temperature change for every certain time window width.

  Next, the current limit value correction determination unit 1512 in the current limit determination unit 151 will be described. FIG. 10 is a block diagram showing the current limit value correction determination unit 1512. The current limit value correction determination unit 1512 includes a correction determination unit 15121 and a correction necessity determination unit 15122. The correction determination unit 15121 is provided for each of the time windows Tw1 to Twn.

Based on the amount of heat input from the heat generation amount calculation unit 1511 and the battery temperature input from the temperature detection unit 125, the correction determination unit 15121 determines the amount of heat generated in the time window and the temperature change in the time window. Comparison is made for each of Tw1 to Twn, and the comparison result is output. First, the correction determination section 15121 is the calorific value of the calorific value calculation unit 1511 time calculated in each window Tw1~Twn _Q Tw1 _~Q the _Twn, threshold preset heating value for each time window Tw1~Twn _{Q th1} Compare with ~ Q _thn . The modification judging unit 15121 is, whether the calorific value _Q Tw1 _{to Q Twn} reaches the threshold value _Q th1 _{to Q thn,} determines for each time window Tw1～Twn.

When the correction determination unit 15121 determines that the heat generation amount has reached the threshold value, the temperature ΔT changes in the time acquired by the temperature detection unit 125 and the temperature change threshold values (lower limit threshold value ΔT _LT , upper limit threshold value ΔT _UT ). Compare the magnitude relationship with. The temperature change threshold is set for each of the time windows Tw1 to Twn. That is, as the width of the time window is larger, the temperature change thresholds (lower threshold ΔT _LT , upper threshold ΔT _UT ) are also set to larger values. This determination and comparison is performed for each time window, and the comparison result is output from the correction determination unit 15121. FIG. 11 is a diagram showing a temperature change for each time window. In FIG. 11, a line L3 indicates a time-series change in temperature. Temperatures Tcell1 to Tcell4 indicate the time at the left end position (start position) of the time windows Tw1 to Tw4. The temperature changes ΔT _{Tw1 to} T Tw4 in the time windows _{Tw1 to Tw4} can be expressed by the difference between the temperature Tcell and the temperatures Tcell1 to _Tcell4 at the current time.

As a comparison result, for example, when the temperature change ΔT is higher than the threshold range (ΔT _UT ≦ ΔT), the flag “1” is output, and when the temperature change ΔT is lower than a certain threshold range (ΔT ≦ ΔT) _The flag “2” is output to ( _LT ), and when the temperature change ΔT is within the threshold range (ΔT _LT ≦ ΔT ≦ ΔT _UT ), the flag “0” is output.

  Next, the correction necessity determination unit 15122 will be described. A determination result for each of the time windows Tw1 to Twn is input from the correction determination unit 15121 to the correction necessity determination unit 15122. The correction necessity determination unit 15122 determines whether or not the current limit value should be corrected based on the determination results for each of the time windows Tw1 to Twn, and outputs the correction necessity determination result. For example, there is a method of outputting the flag having the largest number among the plurality of flags input from the correction determination unit 15121 as the correction necessity determination result output. In addition, the flag input for each time window from the correction determination unit 15121 may be output for each time window as it is so that a current limit value correction process described later can be executed for each time window. Furthermore, the correction determination result of the correction determination unit 15122 may be counted for a predetermined number of times, and whether or not correction is necessary is determined based on the counted result and output.

  FIG. 12 is a block diagram showing the current limit value calculation unit 1513. The current limit value calculation unit 1513 includes a current limit value correction unit 15131, a current limit determination unit 15132, and a current limit value setting unit 15133. The current limit determination unit 15132 is provided for each of the time windows Tw1 to Twn.

  The current limit value correction unit 15131 executes current limit value correction processing based on the correction necessity determination flag input from the current limit value correction determination unit 1512 illustrated in FIG. 10. The correction result is stored in the storage unit 180 and output to the current limit determination unit 15132. FIG. 13 is a diagram illustrating a current limit value correction process. In FIG. 13, a line L40 is a current limiting characteristic set at the present time. When the vehicle is started, the current limiting characteristic stored in advance in the storage unit 180 is set as the current limiting characteristic. If the input correction necessity determination flag is a flag requesting correction, the setting of the current limiting characteristic is changed from the line L40 to the lines L41 and L42.

For example, consider the case where the above-described correction necessity determination unit 15122 is configured to output the flag having the largest number among the plurality of flags input from the correction determination unit 15121. If modification request judgment flag is "1", among the plurality of time windows heating value exceeds its threshold value, the time the temperature change [Delta] T obtained in the time window width is higher than the upper limit threshold [Delta] T _UT The number of windows will be the largest. In this case, it is determined that the current limit is insufficient (insufficient), and the current limit characteristic is corrected so as to increase the current limit. That is, the current limiting characteristic indicated by the line L40 in FIG. 13 is corrected downward as indicated by the line L41, and the current limiting value of all time windows is corrected to be small. As a result, the current limit is further strengthened.

On the other hand, when the correction request determination flag is “2”, it is determined that the current limit is excessive because the heat generation amount exceeds the threshold value but the temperature change ΔT is lower than the lower limit threshold value ΔT _LT. The current limit characteristic is corrected so as to loosen the limit. That is, the current limiting characteristic indicated by the line L40 in FIG. 13 is corrected upward as indicated by the line L42 so that the current limiting values of all the time windows are increased. If the correction request determination flag is “0”, it is determined that the current limit is appropriate, and the current limit characteristic is not corrected.

Further, as described above, in the case where the correction necessity determination unit 15122 in FIG. 10 is configured to output the flag input from the correction determination unit 15121 for each time window as it is for each time window, the current is output for each time window. The limit value may be corrected. That is, instead of correcting the current limit characteristic L40 upward or downward as a whole, the current limit value is corrected every time window. Further, the correction amount of the current limit value may be such that, for example, when the correction determination request flag is “1” or “2”, the 1 A current limit value may be corrected downward or corrected upward. When the temperature rise deviates from the temperature rise threshold (ΔT _UT or ΔT _LT ), a correction amount corresponding to the difference between the actual temperature rise and the temperature rise threshold may be determined in advance.

Next, the current limit determination unit 15132 will be described. The current limit determination unit 15132, and the corrected current limit value from the current limit value modification unit 15131, and the calorific value _Q Tw1 _{to Q Twn} of time calculated by the heat generation amount calculation unit 1511 for each window Tw1~Twn is input The Current restriction determination unit 15132 determines whether the calculation result of the calorific value _Q Tw1 _{to Q Twn} in accordance with the time window has reached the threshold _Q th1 _{to Q thn} of calorific value, sets a limit request flag. For example, the restriction request flag is set to “1” when the heat generation amount reaches the threshold value, and the restriction request flag is set to “0” when it has not reached. After setting the limit request flag, it outputs it to the current limit value setting unit 15133.

  Next, the current limit value setting unit 15133 will be described. The current limit value setting unit 15133 sets the current limit value based on the limit request flag input from the limit determination unit 15132. As a method of setting the current limit value, for example, among a plurality of set time windows, the current limit value having the smallest value among the current limit values in the time window in which the calorific value is determined to be higher than the threshold value is determined. Set to. The current limit value used here is the current limit value after the change when the temperature change ΔT in the time window is out of the threshold range and changed from the line L40 to the lines L41 and L42. .

(Detailed description of the battery state detection unit 152)
The battery state detection part 152 which comprises the assembled battery control part 150 is demonstrated. The battery state detection unit 152 is based on the voltage of the single cell 111 measured by the single cell control unit 120, the current value acquired by the current detection unit 130, and the battery temperature acquired by the temperature detection unit 125. Is calculated. As shown in the following formula (4), the SOC is expressed as a ratio between the capacity Qmax at the time of full charge and the capacity Qremain currently stored in the battery. Further, the deterioration state SOHR based on the internal resistance is expressed as a ratio between the internal resistance R0 at the time of a new product and the current internal resistance R1, as shown by the following formula (5). Here, the calculation method of SOC and SOHR is omitted as it is known.

(Detailed description of the power limit calculation unit 153)
FIG. 14 is a block diagram showing the power limit calculation unit 153. The power limit calculation unit 153 receives the current limit value determined by the current limit value determination unit 151, the SOC and SOHR calculated by the battery state detection unit 152, and the battery temperature detected by the temperature detection unit 125. . The power limit calculation unit 153 calculates and outputs the power limit value of the assembled battery 110 based on these input values. The power limit value is calculated by the following formula (6) based on the current limit value and the voltage of the assembled battery 110 when a current corresponding to the current limit value is energized to the assembled battery 110. In Equation (6), N is the number (units) of unit cells 111 constituting the assembled battery 110, I _limit is the current limit value (A), OCV is the open circuit voltage (V), and R0 is the internal resistance ( Ω) and SOHR indicate the deterioration state (%).

  Next, an example of the current limiting operation and the current limiting characteristic correcting operation will be described with reference to the flowcharts of FIGS. This process is repeatedly executed at predetermined time intervals in the assembled battery control unit 150. First, the overall flow will be described with reference to FIG.

  In step S100, it is determined whether a vehicle activation signal (a signal indicating whether the vehicle has been activated) has been received. If it determines with having received the vehicle starting signal, it will progress to step S110 from step S100.

In step S110, calorific values Q _{Tw1 to} Q _Twn are calculated for each of the time windows _{Tw1 to} Twn, and the battery temperature is measured. In step S120, the calorific value _Q Tw1 _{to Q Twn} computed for each time window Tw1～Twn determines whether the threshold _Q th1 _{to Q thn} more per time window Tw1～Twn. Here, when it determines with the emitted-heat amount being less than a threshold value regarding all the time windows Tw1-Twn, it returns to step S110. On the other hand, if the heat generation amount is greater than or equal to the threshold value in any time window, the process proceeds to step S130.

In step S130, the temperature changes ΔT _{Tw1 to} T _Tw4 acquired for each of the time windows _{Tw1 to Twn} are _compared with the temperature change threshold values (lower limit value ΔT _LT , upper limit value ΔT _UT ), and the temperature change ΔT is compared with the upper limit value ΔT _UT . It is determined whether it is above or below the lower limit value ΔT _LT . That is, it is determined whether or not the temperature change ΔT is outside the threshold range. If it is determined as YES (out of range) in step S130, the process proceeds to step S140. If it is determined NO (in range), the process proceeds to step S150.

  In step S140, current limit value correction processing is executed. Details of the correction process will be described later. In step S150, a current limit value is determined. That is, when it is determined in step S130 that the temperature change ΔT is outside the threshold range, the current limit value is corrected, and the current limit value is determined using the corrected current limit value. On the other hand, when it is determined in step S130 that the temperature change ΔT is within the threshold range, the current limit value is determined using the current current limit value before correction. In step S160, the power limit value is determined based on the current limit value.

FIG. 16 is a flowchart illustrating an example of the current limit value correction process in step S140. First, in step S141, it determines whether the temperature change [Delta] T in the time window exceeds the upper limit value [Delta] T _UT. When it is determined that [Delta] T> [Delta] T _UT at step S141 proceeds to step S142, the process proceeds to step S143 otherwise.

  In step S142, it is determined that the temperature change ΔT is high, that is, the assembled battery 110 or the single battery 111 is in a state of excessive heat generation, and the current limit value is decreased (that is, the limit is increased). Correct it. In step S143, it is determined that the temperature change is low, that is, the assembled battery 110 or the single battery 111 is not generating heat, and the current limit value is increased (that is, the limit is relaxed).

The effect of this embodiment will be described with reference to FIG. FIG. 17A shows an example of a current waveform flowing through the assembled battery 110, FIG. 17B shows an example of a temperature waveform of the assembled battery 110, and FIG. 17C shows an effective current in the time window Tw1. (Or the average current) is shown, and a state in which charging / discharging is controlled based on two time windows Tw1 and Tw2 is shown. Here, for the sake of simplicity, only the effect of the current limit correction process in the section of the time window Tw1 is shown. That describes only effect of limiting values of a time window Tw1 is modified from _{I th1} of FIG. 17 (c) on to the _{I th1} '.

When the vehicle starts traveling and detects that the calculated value of the heat generation amount exceeds the threshold within the time window Tw1, the battery temperature rise ΔT _Tw1 is detected. When Tw1 has elapsed, since ΔT _Tw1 is within the threshold range (ΔT _LT ≦ ΔT _Tw1 ≦ ΔT _UT ), a current limit value (I _th1 ) corresponding to Tw1 stored in the storage unit 180 is set and set. The charge / discharge is controlled so as not to deviate from the current limit value or the power limit value determined based on the current limit value.

Similarly, after the time window Tw2 elapses, the battery temperature increase ΔT _Tw2 is detected. When Tw2 has elapsed, the temperature rise (ΔT _Tw2 ) measured from the temperature waveform (line L52) as shown in FIG. 17B is smaller than the lower limit threshold for temperature rise (ΔT _Tw2 ≦ ΔT _LT ). It is determined that the current limit value stored in 180 excessively limits the current, and the limit of the current limit value corresponding to each time window in which the current limit value is stored in advance in the storage unit 180 is relaxed. Correct in the direction. That is, herein, to modify the _{I th1} as shown in FIG. 17 (c) to _{I th1} '. As a result, the effective current value (or the average current value) after the current limit value correction shown in the line L53 in FIG. 17C is compared with the case of no correction shown in the line L54 in FIG. , Big value. In addition, the current value after correction of the line L50 in FIG. 17A also has a larger absolute value of current than the current value without correction shown in the line L51. FIG. 17 illustrates an example in which charge / discharge is controlled based on the corrected current limit value, but charge / discharge is controlled based on the power limit value determined based on the corrected current limit value. Also good.

The case where the detected temperature rise (ΔT _Tw2 ) is smaller than the temperature rise lower limit threshold has been described as an example based on FIG. 17, but if the temperature rise is larger than the temperature rise upper limit threshold (ΔT _Tw2 ≧ ΔT _UT ), current limiting is performed. In other words, the current limit value is corrected to a small value.

Further, the degree of temperature increase differs depending on the difference between the battery temperature and the ambient temperature of the battery. When a certain charge / discharge pattern is input, the temperature rises, but eventually, the point where the heat generation and heat dissipation of the battery are balanced (the heat dissipation amount that increases according to the difference between the battery temperature and the ambient temperature is equal to the heat generation amount of the battery) Point). When the heat generation and heat dissipation of the battery are balanced, the temperature change in the time window becomes small despite charging / discharging, so the temperature rise in the time window is determined to be below the threshold value despite charging / discharging. However, the current limitation may be excessively relaxed. Therefore, the difference between the ambient temperature of the battery and the current temperature may be obtained, and the temperature increase threshold value (ΔT _UT or ΔT _LT ) for each time window may be determined accordingly.

  According to the present embodiment, it is possible to appropriately set the current limit value or the power limit value based on the temperature rise of the battery, so that the output reduction due to deterioration does not deviate from the thermal restriction of the battery. Suppressible charge / discharge control can be realized.

-Second Embodiment-
In the first embodiment described above, by correcting the current limit value (or power limit value), the battery system does not deviate from thermal restrictions and suppresses output reduction due to deterioration of the secondary battery. Charge / discharge control can be realized. In the second embodiment described below, instead of limiting the current value or power value of the assembled battery 110, the amount of power (unit: Wh) of the assembled battery 110 is limited to solve the above problem. I tried to do it.

  A configuration example of the power storage device of the plug-in hybrid vehicle in the present embodiment is the same as FIG. Moreover, although the structural example of the cell control part 121 in this embodiment is the same as that of FIG. 2, only the structure of the assembled battery control part 150 is different. Below, the assembled battery control part from which a structure differs is demonstrated.

  FIG. 18 is a block diagram showing an assembled battery control unit 150A in the present embodiment. The assembled battery control unit 150A corresponds to the assembled battery control unit 150 shown in FIG. The assembled battery control unit 150A includes a battery state detection unit 152A, a power amount restriction coefficient determination unit 154, and a power amount restriction unit 155.

The power amount limiting coefficient determination unit 154 determines a limiting coefficient for limiting the power amount based on the current input from the current detection unit 130 and the battery temperature input from the temperature detection unit 125. The power amount restriction unit 155 calculates the power amount based on the restriction coefficient determined by the power amount restriction coefficient determination unit 154 and the battery temperature from the temperature detection unit 125. The battery state detection unit 152A corresponds to the battery state detection unit 152 of the first embodiment, and calculates the deterioration state SOHQ of the unit cell 111 in addition to the SOC and SOHR of the unit cell 111. This SOHQ indicates the rate of decrease of the full charge capacity of the unit cell 111 due to deterioration, and is defined by the following formula (7) using the full charge capacity Qmax0 when new and the full charge capacity Qmax after deterioration. Is done. Here, since the calculation method of SOHQ is a well-known one, details are omitted.

  FIG. 19 is a block diagram showing the power amount limiting coefficient determination unit 154. As shown in FIG. The power amount limiting coefficient determining unit 154 includes a heat generation amount calculating unit 1541 and a power amount limiting coefficient calculating unit 1542. The calorific value calculation unit 1541 is the same as the calorific value calculation unit 1511 of the first embodiment, and has the same configuration as that shown in FIG. . The power amount limit coefficient calculation unit 1542 determines and outputs a power amount limit coefficient based on the heat generation amount Q calculated by the heat generation amount calculation unit 1541 and the battery temperature measured by the temperature detection unit 125.

The power amount limiting coefficient calculation unit 1542 provides a heat generation amount threshold value (Q _{th1 to} Q _thn ) for each time window, and when the heat generation amount reaches the threshold value, the temperature change threshold value (ΔT _LT , ΔT _UT ) and the acquired temperature change Compare ΔT _Tw . Then, in any time window, when the temperature change ΔT _Tw is ΔT _Tw ≧ ΔT _UT , for example, a value smaller than 1 is output as the power amount limiting coefficient. The power amount can be limited by multiplying the power amount calculation coefficient, which will be described later, by this power amount limit coefficient. When ΔT _LT ≦ ΔT _Tw ≦ ΔT _UT , the power amount limiting coefficient = 1 (initial setting value).

  Next, the power amount restriction unit 155 will be described with reference to FIGS. FIG. 20 is a diagram illustrating an example of the definition of the electric energy, where the horizontal axis indicates the SOC and the vertical axis indicates the battery voltage. In FIG. 20, the waveform indicated by the dotted line indicates the open circuit voltage (OCV) of the unit cell 111, and the waveform indicated by the solid line indicates the battery voltage when energized with a certain current.

When a current in the unit cell 111 is energized, a voltage change occurs due to the internal resistance of the unit cell 111 as shown by the solid line in the figure. During discharging, the voltage drops from the open circuit voltage by the voltage change caused by the internal resistance. The definition of the remaining power amount described in the present embodiment is calculated by the following equation (8), for example. That is, the product of the amount of electricity and the battery voltage from the current SOC to the lower limit SOC, that is, the hatched portion in the figure. Here, the battery voltage in the equation (8) is calculated by the following equation (9) using the open circuit voltage (OCV), the internal resistance (R), and the rate of increase of the internal resistance (degraded state SOHR). The current value used for the electric energy calculation included in Equation (9) may be a fixed value, or may be variable based on past current history.

In addition, the amount of electricity in the equation (8) is calculated from the current SOC to the lower limit SOC using the current SOC (SOC), the lower limit SOC, the full charge amount Qmax0 at the time of a new product, and the rate of decrease of the full charge capacity (SOHQ). Is calculated from the following equation (10). The lower limit SOC in the equation (10) may be defined as a function of temperature and deterioration state as an SOC for securing a minimum output necessary for the vehicle to travel, or may be a fixed value, for example, actual use It may be defined as the lower limit SOC of the battery at the time.

  FIG. 21 is a block diagram showing the power amount limiting unit 155. As shown in FIG. The power amount calculation unit 1551 provided in the power amount restriction unit 155 calculates the power amount based on Expression (8). The calculation result is multiplied by the limit coefficient input from the power amount limit coefficient determination unit 154 and output as the final power amount.

  Based on FIG. 22, the effect of the invention in the present embodiment will be described. FIG. 22 shows three graphs. From the top, a graph plotting changes in temperature (line L61), SOC (line L62), and electric energy (line L63) during charging / discharging of the assembled battery 110 is shown. Show.

  When an excessive temperature rise of the battery is detected during charging / discharging of the assembled battery 110, that is, in any one of the time windows, the temperature change detected by the temperature detection unit 125 is greater than a preset temperature change threshold value. When it is detected that the value is large, the power amount limiting coefficient determination unit 154 determines a limiting coefficient and limits the power amount.

  When the amount of power is limited by detecting an excessive temperature rise, as compared with the case where there is no limit on the amount of power (line indicated by a broken line) as shown by the waveform of the power amount shown by the solid line in FIG. 22 (line L63). The calculation result becomes smaller. For this reason, it becomes possible to calculate an appropriate amount of electric power according to the use state of the assembled battery 110, and as a result, transient use of the battery system can be avoided.

  The configuration of the assembled battery control unit 150A described above is merely an example, and is not limited to the configuration described above (for example, the configuration illustrated in FIG. 21).

-Third embodiment-
A third embodiment of the present invention will be described with reference to FIGS. In the third embodiment, the current is limited in accordance with a ratio of energization time within a certain period (hereinafter, this ratio is referred to as a Duty ratio).

  This embodiment differs from the first embodiment only in the configuration of the current limit value determination unit 151 in the assembled battery control unit 150 shown in FIG. Therefore, in the following description, only the current limit value determination unit 151 different from the first embodiment will be described. In the present embodiment, reference numeral 151B is assigned to the current limit value determining unit. FIG. 24 is a block diagram showing the current limit value determining unit 151B.

  First, the relationship between the duty ratio and the current limiting characteristic in this embodiment will be described with reference to FIG. FIG. 23A is a diagram for explaining the definition of the duty ratio, and FIG. 23B is a diagram showing the current limiting characteristic according to the duty ratio. By the way, the deterioration of the battery varies depending on the usage state of the battery. In particular, it differs depending on how often current is supplied to the unit cell 111. Therefore, as shown in FIG. 23A, the energization time in a certain period, for example, one day (= 24 hours) is defined as the Duty ratio. That is, it is defined as (Duty ratio) = (energization time) / (constant time). Further, as indicated by a line L71 in FIG. 23B, a current limit value corresponding to the duty ratio is determined. Then, at the time of designing the battery system, a current limit value corresponding to the duty ratio corresponding to the usage frequency of the user is set in advance. A line L71 indicates a current limit value set in advance for each time window as described above, and is stored in the storage unit 180.

  Since how the battery is used varies depending on the user, the duty ratio shown in FIG. 23A also varies depending on the user. Therefore, in this embodiment, as shown in FIG. 24, a current limit value determination unit 151B is obtained by further adding a duty ratio determination unit 1514 to the current limit value determination unit 151 in the first embodiment.

  Then, the duty ratio is calculated by measuring the energization time within a certain period (for example, one day (= 24 hours)), and the current limit value is corrected accordingly. That is, when the duty ratio during use of the battery system is smaller than the duty ratio corresponding to the preset current limit characteristic, the duty ratio is corrected so as to loosen the current limit (line L72), and the duty ratio during use of the battery system is If it is larger than the duty ratio corresponding to the preset current limit characteristic, the current limit is corrected so as to increase (line L73).

  In the present embodiment, the battery control system 100 can perform the same current limit control as in the first embodiment, and further according to the usage state of the assembled battery 110 (according to the duty ratio). It is possible to calculate an appropriate current limit value or power limit value. As a result, a battery control system capable of achieving both protection of the battery system and maximum utilization of energy can be provided. The restriction process according to the duty ratio in the present embodiment can also be applied to the cases of the first and second embodiments described above.

In the embodiment described above, the battery control system 100 includes the current detection unit 130 that detects the current of the unit cell 111, the temperature detection unit 125 that detects the temperature of the unit cell 111, and the unit in the predetermined time windows Tw1 to Twn. current and temperature history of the battery 111 (for example, the calorific value _Q Tw1 _{to Q Twn,} the temperature change ΔT _Tw1 ~T _Tw4) based on the current value to limit the current of the unit cell 111 so as not to exceed the current limit value And a control unit 150 that performs restriction control. Then, the control unit 150, when the temperature changes [Delta] T _Tw1 through T _Tw4 in a predetermined time window Tw1~Twn is within the predetermined range (less than or equal to the upper limit threshold value [Delta] T _UT at the lower limit threshold [Delta] T _LT or higher) has already been set When the current is limited by the first current limit value (line L40 in FIG. 13) and the temperature changes ΔT _{Tw1 to} T _Tw4 in the predetermined time windows _{Tw1 to Twn} are outside the predetermined range, the first current limit values are different. The setting is changed to the second current limit value (lines L41 and L42 in FIG. 13), and the current is limited by the second current limit value after the setting change.

  Since the preset current limit value is set on the premise of a predetermined load pattern, when the current limit is performed using only the current limit value as in the conventional case, for example, the battery is used in a high load pattern. In some cases, the battery temperature may rise excessively and deviate from the thermal constraints of the battery. Conversely, when used in a low load pattern, there is a possibility of excessive current limiting. However, in the present embodiment, as described above, the current limit value is changed according to the temperature change of the battery, so that the current limit according to the actual use state can be performed, which is too small or too large. Current limit can be avoided, and the current limit value can be appropriately set according to the state of the battery system.

  The second current limit value is set to a value smaller than the first current limit value when the temperature change exceeds a predetermined range, and is larger than the first current limit value when the temperature change falls below the predetermined range. It is good to be said.

  Further, the predetermined time window is composed of a plurality of time windows Tw1 to Twn having different time widths, and a change in temperature for each of the plurality of time windows Tw1 to Twn is compared with a predetermined range set for each of the time windows Tw1 to Twn. As a result, the state of the battery can be grasped more accurately, and more appropriate current limitation can be performed.

  Furthermore, while performing the limit control using the current limit value, by limiting the power output from the battery by the battery state, the first or second current limit value, and the power limit value based on the battery state, More appropriate restriction control can be performed in consideration of the degradation state SOHR and the like.

  In addition, the battery control system 100 includes a current detection unit 130 that detects the current of the unit cell 111, a temperature detection unit 125 that detects the temperature of the unit cell 111, and the current and temperature of the unit cell 111 in a predetermined time window Tw1 to Twn. And a control unit 150 that performs restriction control for restricting a change in the electric energy of the single battery 111 based on the history of As described above, when the amount of power is limited by detecting an excessive temperature rise, the calculation result is smaller than when the amount of power is not limited (line indicated by a broken line) as shown by a line L63 in FIG. Thus, the transient use of the unit cell 111 can be avoided.

  As the current history, the battery heat parameter, the amount of heat generated by the battery based on the internal resistance of the battery and the current detected by the current detector, and the current square integrated value based on the current detected by the current detector Alternatively, an average current section value in a time window may be used.

  Furthermore, a duty ratio detection unit 1514 is provided as a duty ratio detection unit that detects a duty ratio as a ratio of the current application time in the time window, and the first and second current limit values are determined based on the duty ratio by the duty ratio determination unit 1514. That is, the lines L41 and L42 shown in FIG. 13 are further changed to lines L72 and L73 in FIG. 23B based on the duty ratio. As a result, it is possible to calculate an appropriate current limit value or power limit value according to the usage state of the battery (according to the duty ratio), and it is possible to achieve both protection of the battery system and maximum utilization of energy. Become.

  Each of the embodiments described above may be used alone or in combination. This is because the effects of the respective embodiments can be achieved independently or synergistically. Moreover, the above description is an example to the last and this invention is not limited to the said embodiment at all. For example, in the above-described embodiment, a plurality of time windows Tw1 to Twn are set, but the present invention can be similarly applied even when there is one time window.

  10: battery system, 100: battery control system, 110: battery pack, 111: single battery, 125: temperature detector, 130: current detector, 150, 150A: battery controller, 151, 151B: current limit value determination Unit, 153: power limit calculation unit, 154: power amount limit coefficient determination unit, 155: power amount limit unit, 180: storage unit, 1514: Duty ratio determination unit, Tw1 to Twn: time window

Claims (12)

A current detector for detecting the current of the battery;
A temperature detector for detecting the temperature of the battery;
A control unit that performs limit control to limit the current of the battery so that the current value does not exceed a current limit value based on a history of current and temperature of the battery in a predetermined time window. ,
The controller is
If the change in temperature in the predetermined time window is within a predetermined range, the current is limited by the first current limit value that is already set,
When the change in temperature in the predetermined time window is out of a predetermined range, the first current limit value is changed to a different second current limit value, and the current is changed according to the second current limit value after the setting change. limited to,
When changing the setting of the first current limit value to the second current limit value, if the temperature change exceeds the predetermined range, the second current limit value is smaller than the first current limit value. The battery control system is characterized in that when the temperature change falls below the predetermined range, the second current limit value is set to a value greater than the first current limit value . A current detector for detecting the current of the battery;
A temperature detector for detecting the temperature of the battery;
A control unit that performs limit control to limit the current of the capacitor so that the current value does not exceed the current limit value based on the current and temperature history of the capacitor in a predetermined time window,
The controller is
If the change in temperature in the predetermined time window is within a predetermined range, the current is limited by the first current limit value that is already set,
When the change in temperature in the predetermined time window is out of a predetermined range, the first current limit value is changed to a different second current limit value, and the current is changed according to the second current limit value after the setting change. A battery control system to limit,
The predetermined time window is composed of a plurality of time windows having different time widths,
The predetermined range is set for each of the plurality of time windows,
The controller is
Comparing the change in temperature with the predetermined range corresponding to each of the plurality of time windows to determine whether the change in temperature is within a predetermined range or out of a predetermined range;
A battery control system, wherein the current is limited by the first current limit value or the second current limit value based on the determination result. The battery control system according to claim 1 or 2 ,
The controller is
A battery control system that performs the limit control and limits the power output from the battery by a power limit value based on a battery state and the first or second current limit value. The battery control system according to any one of claims 1 to 3 ,
The controller is
As the current history, calculate the calorific value of the battery based on the internal resistance of the battery and the current detected by the current detector,
The battery control system, wherein the restriction control is performed based on a calculation result of a calorific value of the battery and a change in the temperature. The battery control system according to any one of claims 1 to 3 ,
The controller is
As the current history, the current square integrated value based on the current detected by the current detection unit is calculated,
The battery control system, wherein the limit control is performed based on a calculation result of the current square integrated value and a change in the temperature. The battery control system according to any one of claims 1 to 3 ,
The controller is
As the current history, calculate the current interval average value in the predetermined time window,
The battery control system, wherein the limit control is performed based on the current section average value and the temperature change. The battery control system according to any one of claims 1 to 3 ,
A duty ratio detection unit for detecting a duty ratio as a ratio of a current application time in the predetermined time window;
The controller is
The battery control system, wherein the first and second current limit values are changed based on the duty ratio detected by the duty ratio detection unit. A current detector for detecting the current of the battery;
A temperature detector for detecting the temperature of the battery;
A control unit that performs limit control to limit the current of the capacitor so that the current value does not exceed the current limit value based on the current and temperature history of the capacitor in a predetermined time window,
The controller is
If the change in temperature in the predetermined time window is within a predetermined range, the current is limited by the first current limit value that is already set,
When the change in temperature in the predetermined time window is out of a predetermined range, the first current limit value is changed to a different second current limit value, and the current is changed according to the second current limit value after the setting change. A battery control system to limit,
The controller is
As the current history, calculate the calorific value of the battery based on the internal resistance of the battery and the current detected by the current detector,
The battery control system, wherein the restriction control is performed based on a calculation result of a calorific value of the battery and a change in the temperature. A current detector for detecting the current of the battery;
A temperature detector for detecting the temperature of the battery;
A control unit that performs limit control to limit the current of the capacitor so that the current value does not exceed the current limit value based on the current and temperature history of the capacitor in a predetermined time window,
The controller is
If the change in temperature in the predetermined time window is within a predetermined range, the current is limited by the first current limit value that is already set,
When the change in temperature in the predetermined time window is out of a predetermined range, the first current limit value is changed to a different second current limit value, and the current is changed according to the second current limit value after the setting change. A battery control system to limit,
A duty ratio detection unit for detecting a duty ratio as a ratio of a current application time in the predetermined time window;
The controller is
The battery control system, wherein the first and second current limit values are changed based on the duty ratio detected by the duty ratio detection unit. The battery control system according to claim 8 or 9 ,
The controller is
A battery control system that performs the limit control and limits the power output from the battery by a power limit value based on a battery state and the first or second current limit value. A current detector for detecting the current of the battery;
A temperature detector for detecting the temperature of the battery;
A control unit that performs restriction control to limit a change in the amount of electric power of the battery, based on the current and temperature history of the battery in a predetermined time window , and
The controller is
As the current history, calculate the calorific value of the battery based on the internal resistance of the battery and the current detected by the current detector,
The battery control system, wherein the limit control is performed based on a calculation result of a calorific value of the battery and a history of the temperature . A current detector for detecting the current of the battery;
A temperature detector for detecting the temperature of the battery;
A control unit that performs restriction control to limit a change in the amount of electric power of the battery, based on a history of current and temperature of the battery in a predetermined time window;
A duty ratio detection unit that detects a duty ratio as a ratio of a current application time in the predetermined time window ;
The controller is
The battery control system characterized by changing the electric energy based on the duty ratio detected by the duty ratio detection unit .

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