JP5585308B2 - Battery control device - Google Patents

Battery control device Download PDF

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JP5585308B2
JP5585308B2 JP2010189444A JP2010189444A JP5585308B2 JP 5585308 B2 JP5585308 B2 JP 5585308B2 JP 2010189444 A JP2010189444 A JP 2010189444A JP 2010189444 A JP2010189444 A JP 2010189444A JP 5585308 B2 JP5585308 B2 JP 5585308B2
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battery
current
allowable
voltage
based
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JP2012050228A (en
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ゆかり 田所
武志 藤田
拓哉 木下
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日産自動車株式会社
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Description

    The present invention relates to a battery control device.

  Calculate each permissible discharge current or each permissible charge current of a plurality of batteries connected in parallel, and based on the calculated permissible discharge current or the lowest permissible charge current among the permissible discharge current or permissible charge current, There is known a power supply control device that sets an overall current flowing through the plurality of batteries and controls charge / discharge currents of the plurality of batteries (Patent Document 1).

Japanese Patent Laid-Open No. 2004-215559

  However, when the conventional power supply control device is applied to control a power supply including a battery group in which a plurality of battery arrays connected in series are connected in parallel, the current flows in a battery array different from the battery that is the reference of the smallest allowable discharge current. There was a possibility that the discharge current would exceed the allowable current of the battery in the battery row, resulting in overdischarge.

  Therefore, the present invention provides a battery control device that prevents overdischarge or overcharge of a battery group in which a plurality of battery arrays connected in series are connected in parallel.

  The present invention calculates the allowable current of each battery in the battery group, calculates a first voltage applied to the battery array using the allowable current, and controls the current of each battery based on the calculation result. Solve the problem.

The present invention estimates the current that actually flows for each battery included in the battery group, and controls the current of each battery, so that overdischarge or overcharge in a battery other than the reference battery when setting the current is performed. After confirming the possibility of charging, the optimum current of each battery can be controlled, and as a result, overdischarge or overcharge of the battery can be prevented.

It is a block diagram which shows the battery control apparatus which concerns on embodiment of invention. It is a flowchart which shows the control procedure of the battery control apparatus of FIG. It is a flowchart which shows the control procedure of the battery control apparatus which concerns on other embodiment of invention.

  Hereinafter, embodiments of the invention will be described with reference to the drawings.

<< First Embodiment >>
FIG. 1 is a block diagram showing a battery control system according to an embodiment of the present invention. A battery group 1 shown in the figure is a battery group 100 in which a battery string 1 and a battery string 2 are connected in parallel. In the battery row 1, the cell 11 and the cell 21 are connected in series, and in the battery row 2, the cell 12 and the cell 22 are connected in series. The unit cells 11, 12, 21, and 22 are secondary batteries such as lithium-ion batteries, for example, and the same battery is used. However, the use of these batteries may cause variations. . Further, the battery group 100 of this example is provided with four batteries, but it is not always necessary to have four batteries. The battery array group 100 only needs to include at least a plurality of battery arrays 1 and 2 in which batteries are connected in series.

  Voltage sensors 31, 32, 33, and 34 are connected to the cells 11, 12, 21, and 22, respectively. The voltage sensors 31, 32, 33, 34 detect the voltages of the single cells 11, 12, 21, 22 and transmit the detected voltages to the battery controller 10 described later. The voltage sensors 31, 32, 33, 34 may detect the voltages of the individual cells 11, 12, 21, 22 at a preset sampling cycle, for example, and control signals to be transmitted from the battery controller 10. The voltage may be detected using as a trigger.

  A current sensor 41 is connected to the battery array 1, and a current sensor 42 is connected to the battery array 2. The current sensor 41 detects the current flowing through the batteries 11 and 21 of the battery array 1 and transmits the detected current to the battery controller 10 described later. The current sensor 42 detects the current flowing through the batteries 12 and 22 in the battery array 1 and transmits the detected current to the battery controller 10 described later. The current sensors 31, 32, 33, and 34 detect, for example, currents of the individual cells 11, 12, 21, and 22 at a preset sampling cycle, and trigger a control signal to be transmitted from the battery controller 10. The current may be detected.

  The battery controller 10 manages the state of each single cell 11, 12, 21, 22 from the detected voltage and the detected current. The state of the battery includes, for example, the battery state (SOC: State Of Charge) of each of the unit cells 11, 12, 21, and 22, and the current flowing through or applied to each of the unit cells 11, 12, 21, and 22 The possibility of overdischarge or overcharge based on voltage is also included.

  The control unit 20 is connected to the battery group 100 and controls the current flowing through each of the single cells 11, 12, 21, 22 based on a control signal from the battery controller 10. Each unit cell 11, 12, 21, 22 is charged based on regenerative control of a charger (not shown) or a motor (not shown), and outputs a current to the motor to drive it. At this time, the control unit 20 controls the charging current or the discharging current to prevent the single cells 11, 12, 21, 22 from being overdischarged or overcharged.

Next, the control content of the battery controller 10 will be described. First, the battery controller 10 calculates the open voltage and internal resistance of each of the single cells 11, 12, 21, 22 from the detection voltage of the voltage sensors 31, 32, 33, 34 and the detection current of the current sensors 41, 42. For example, the open-circuit voltage and the internal resistance derive IV linear characteristics from the detection voltage and detection current of each of the cells 11, 12, 21, and 22 at a predetermined time. Then, the internal resistance is derived from the slope of the IV linear characteristic, and the open circuit voltage is derived from the intercept of the IV linear characteristic. Here, the open voltage of the cell 11 is E 1,1 , the open voltage of the cell 21 is E 2,1 , the open voltage of the cell 12 is E 1,2 , and the open voltage of the cell 11 is E 2,1 . 2 . The internal resistance of the cell 11 is R 1,1 , the internal resistance of the cell 21 is R 2,1 , the internal resistance of the cell 12 is R 1,2 , and the internal resistance of the cell 11 is R 2,2 . To do.

Next, the battery controller 10 calculates the allowable discharge current or the allowable charge current of each of the single cells 11, 12, 21, 22. The allowable discharge current is a threshold current of the discharge current of each of the unit cells 11, 12, 21, 22 and indicates a limit value of a current that can be discharged by the unit cell in a certain state. For example, when a discharge current having a magnitude exceeding the allowable discharge current of the single battery 11 is required for the single battery 11, the single battery 11 may be overdischarged. The allowable charging current is a threshold current of the charging current of each of the unit cells 11, 12, 21, and 22, and indicates a limit value of a current that can be charged by the unit cell in a certain state. For example, when the unit cell 11 is charged with a charging current that exceeds the allowable charging current of the unit cell 11, the unit cell 11 may be overcharged. Here, the allowable charging current of the battery 11 is Ic 1,1 , the allowable charging current of the single battery 21 is Ic 2,1 , the allowable charging current of the single battery 12 is Ic 1,2 , and the allowable charging current of the single battery 22 is Let Ic 2,2 . The allowable discharge current of the battery 11 is Id 1,1 , the allowable discharge current of the single battery 21 is Id 2,1 , the allowable discharge current of the single battery 12 is Id 1,2 , and the allowable discharge current of the single battery 22 is Id 2. , 2

The allowable charging current (Ic 1,1 , Ic 2,1 , Ic 1,2 , Ic 2,2 ) is calculated from the maximum allowable voltage of each single cell 11, 12, 21, 22, and the allowable discharge current (Id 1 , 1 , Id 2 , 1 , Id 1 , 2 , Id 2 , 2 ) are calculated from the minimum allowable voltages of the respective cells 11, 12, 21, 22. Here, the maximum allowable voltage of the unit cell 11 is Vc 1,1 , the maximum allowable voltage of the unit cell 21 is Vc 2,1 , the maximum allowable voltage of the unit cell 12 is Vc 1,2 , and the maximum allowable voltage of the unit cell 22 Is Vc 2,2 . Further, the minimum allowable voltage of the battery 11 is Vd 1,1 , the minimum allowable voltage of the single battery 21 is Vd 2,1 , the minimum allowable voltage of the single battery 12 is Vd 1,2 , and the minimum allowable voltage of the single battery 22 is Vd. 2 and 2 . The maximum allowable voltage and the minimum allowable voltage are voltage values set in advance for each of the cells 11, 12, 21, and 22, and correspond to the rated maximum voltage and the rated minimum voltage, respectively.

The allowable charging current (Ic i, j ) is a current that flows in a single cell when a maximum allowable voltage is applied to the single cell. The allowable discharge current (Id i, j ) is the minimum allowable voltage. This is the current that flows through the unit cell when applied. The allowable charging current (Ic i, j ) and the allowable discharging current (Id i, j ) depend on the internal resistance and open circuit voltage of the unit cell, and are calculated by Expression 1 and Expression 2, respectively.

(However, i and j are natural numbers of 1 or more, i corresponds to a row of the battery group 100, and j corresponds to a column of the battery group 100. The same applies hereinafter.)
Next, the battery controller 10 extracts the minimum allowable charging current (Ic min ) from each allowable charging current (Ic i, j ) during charge control, and each allowable charge current during discharge control. The minimum allowable discharge current (Id min ) is extracted from the discharge current (Id i, j ).

Then, when the minimum allowable charging current (Ic min ) or the minimum allowable discharge current (Id min ) flows to the corresponding single cells 11, 12, 21, 22, the battery controller 10 corresponds to the corresponding single cells 11, 12. , 21, and 22 are calculated as estimated currents. For example, when the allowable charging current (Ic 1,1 ) of the unit cell 11 becomes the minimum allowable discharge current (Ic min ), the battery controller 10 estimates the estimated current flowing through the battery array 2. Thereby, the battery controller 10 estimates the current that actually flows through each of the single cells 11, 12, 21, 22.

The estimated current is the voltage between the terminals, the internal resistance and the open circuit voltage of the battery cells 1, 12, 21, 22 corresponding to the minimum allowable charging current (Ic min ) or the minimum allowable discharging current (Id min ). Is calculated from

First, the terminal voltage (V j ) of the battery rows 1 and 2 is calculated from (Equation 3) and (Equation 4).

In addition, Formula 3 and Formula 4 are the voltage between terminals in case the allowable charge current or allowable discharge current of the battery 11 (or battery 21) is the minimum allowable charge current (Ic min ) or the minimum allowable discharge current (Id min ). It is an arithmetic expression of (V 1 ). When the allowable discharge current or the allowable charge current of the batteries 12 and 22 is the minimum allowable charge current (Ic min ) or the minimum allowable discharge current (Id min ), E 1 in (Expression 3) and (Expression 4) , 1 and E 2,1 are replaced by E 1,2 and E 2,2 , and R 1,1 and R 2,1 are replaced by R 1,2 and R 2,2 , and the terminal voltage (V 2 ) is calculated. Further, the voltage between terminals is calculated using (Equation 3) during charging and using (Equation 4) during discharging.

The estimated current (Is j ) is calculated from (Equation 5) using the inter-terminal voltage (V j ).

Note that Formula 5 is an estimated current of the battery array 2 when the allowable discharge current or the allowable charge current of the battery 11 (or the battery 21) is the minimum allowable charge current (Ic min ) or the minimum allowable discharge current (Id min ). It is an arithmetic expression of (Is 2 ). When the allowable discharge current or the allowable charge current of the batteries 12 and 22 is the minimum allowable charge current (Ic min ) or the minimum allowable discharge current (Id min ), in (Equation 5), E 1 , 1 and E 2 , 1 is replaced with E 1,2 + E 2,2 and R 1,1 and R 2,1 are replaced with R 1,2 + R 2,2 to calculate the estimated current (Is 1 ) of battery array 1 Is done.

Next, the battery controller 10 compares the allowable charging current (Ic i, j ) and the estimated current (Is j ) in correspondence with each of the cells 11, 12, 21, 22, or the allowable discharging current (Id i, j ) and the estimated current (Is j ) are compared. Thus, when the minimum allowable charging current (Ic min ) or the minimum allowable discharge current (Id min ) is supplied to the corresponding single cells 11, 12, 21, 22, the other single cells 11, 12, 21, 22 are supplied. It is confirmed whether or not the flowing current is smaller than the allowable charging current (Ic i, j ) or the allowable discharging current (Id i, j ). That is, for example, when the allowable charging current of the cell 11 becomes the minimum allowable charging current, and the minimum allowable charging current is allowed to flow through the single cell 11, the current flowing through the single cells 12 and the single cells 22 in the other battery arrays 2 is estimated current ( Is 2 ). Then, whether or not the estimated current (Is 2 ) is lower than the allowable charging current (Ic 1,2 ) of the unit cell 12 and the allowable charging current (Ic 2,2 ) of the unit cell 22 is checked.

And as a result of the comparison, if the estimated current (Is j ) is less than or equal to the allowable charging current (Ic i, j ) or the allowable discharging current (Id i, j ) in all the cells 11, 12, 21, 22, When the minimum allowable charging current (Ic min ) or the minimum allowable discharge current (Id min ) is passed through the corresponding single cells 11, 12, 21, 22, the excess in all the single cells 11, 12, 21, 22 The possibility of charging or overdischarge is eliminated.

On the other hand, in at least one single cell among the single cells 11, 12, 21, and 22, the estimated current (Is j ) is greater than the allowable charging current (Ic i, j ) or the allowable discharging current (Id i, j ). In such a case, the single cell may be overcharged or overdischarged. Therefore, the battery controller 10 determines the allowable charging current of the cells 11, 12, 21, and 22 in which the estimated current (Is j ) is larger than the allowable charging current (Ic i, j ) or the allowable discharging current (Id i, j ). (Ic i, j ) or allowable discharge current (Id i, j ) is set to the minimum allowable charging current (Ic min ) or the minimum allowable charging current (Id min ). Then, based on the minimum allowable charging current set again (Ic min) or minimum allowable discharge current (Id min), similarly to the above, to the minimum allowable charging current (Ic min) or minimum allowable discharge current (Id min) The estimated current flowing in the battery rows 1 and 2 other than the corresponding single cells 11, 12, 21, and 22 is calculated. Then, similarly to the above, the battery controller 10 compares the estimated current with the corresponding allowable charging current (Ic i, j ) or allowable discharging current (Id i, j ), and all the single cells 11, 12, The possibility of overdischarge or overcharge in 21 and 22 is confirmed.

For example, when the allowable charging current (Ic 1, 1 ) of the cell 11 becomes the minimum allowable charging current (Ic min ) and the minimum allowable charging current (Ic min ) flows through the cell 11, the estimation is performed in the cell 22. A case where the current (Is 2 ) is larger than the allowable charging current (Ic 2, 2 ) will be described. First, the battery controller 10 resets the allowable charging current (Ic 2, 2 ) to the minimum allowable charging current (Ic min ). Next, the battery controller 10 calculates the voltage (V 2 ) between the terminals of the battery array 2 using (Equation 3) based on the minimum allowable charging current (Ic min = Ic 2, 2 ). Then, the battery controller 10 calculates an estimated current (Is 1 ) of the battery array 1 that is a battery array that does not include the single cells 22 using (Equation 5). Then, in the battery 11 and the battery 12 of the battery array 1, whether or not the estimated current (Is 1 ) is equal to or less than the allowable charging current (Ic 1, 1 ) and the allowable charging current (Ic 2, 1 ) is compared. . Here, since the voltage (V s ) between the terminals of each battery row is low, the estimated current (Is 1 ) has a current value smaller than the minimum allowable charging current (Ic min ) set first. Then, if the estimated current (Is 1 ) is equal to or lower than the allowable charging current (Ic 1, 1 ) and the allowable charging current (Ic 2, 1 ), all the cells 11, 12, 21, 22 are overcharged. It is determined that there is no possibility.

Finally, in all the unit cells 11, 12, 21, and 22, when the estimated current (Is j ) becomes equal to or less than the allowable charging current (Ic i, j ) or the allowable discharge current (Id i, j ), the battery In order for the controller 10 to control the overall current of the battery group 100 by the control unit 20, a control signal based on the set minimum allowable charging current (Ic min ) or minimum allowable charging current (Id min ) is sent to the control unit 20. Send to.

Next, the control contents of the control unit 20 will be described. The control unit 20 controls the overall discharge current or charging current of the battery group 100 based on the control signal transmitted from the battery controller 10. The control unit 20 is connected to the battery controller 10 through a control signal line, and can grasp the state of each unit cell 11, 12, 21, 22 through the battery controller 10. Then, the control unit 20 from the information of the information about the state of the cells 11, 12, 21, 22, finally set minimum permissible charging current (Ic min) or minimum allowable discharge current (Id min), the By calculating the current flowing through the battery rows 1 and 2, the entire current of the battery group 100 is set.

  Thereby, in this example, after confirming the possibility of overdischarge or overcharge in all the unit cells 11, 12, 21, 22, the current of the entire battery group 100 is controlled.

  Next, the control procedure of the battery control device of this example will be described with reference to FIG. FIG. 2 is a flowchart showing a control procedure of the battery control device of this example when setting the charging current. As for the discharge control procedure, Formula 2 is used instead of Formula 1, Formula 4 is used instead of Formula 3, and the basic control procedure is the same as the following, and thus the description thereof is omitted.

First, in step S <b> 1, the battery controller 10 determines the internal resistances of the individual cells 11, 12, 21, 22 based on the detected voltages and detected currents of the voltage sensors 31, 32, 33, 34 and current sensors 41, 42. R i, j ) and the open circuit voltage (E i, j ) are calculated.

In step S <b> 2, the battery controller 10 calculates the allowable charging current (Ic i, j ) of each single cell 11, 12, 21, 22 using Equation 1.

Then, set at step S3, the allowable charging current (Ic i, j) calculated by step S2 among the minimum allowable charging current (Ic i, j), the minimum allowable charging current (Ic min) To do.

In step S < b> 4, the battery controller 10 calculates the voltage (V j ) between the terminals of the battery arrays 1 and 2 using Equation 3. In step S < b > 5, the battery controller 10 calculates an estimated current (Is j ) using Equation 5. At this time, the estimated current is an estimated current (Is j ) flowing through a battery string other than the battery string of the battery corresponding to the minimum allowable charging current (Ic min ) set in step S3.

Next, in step S6, the allowable charging current (Ic i, j ) and the estimated current (Is j ) are compared. In step S2, the allowable charging current (Ic i, j ) of each of the single cells 11, 12, 21, and 22 is calculated. In the battery through which the estimated current (Is j ) flows, the allowable charging current (Ic i, j ) and The estimated current (Is j ) is compared for each cell.

If the estimated current (Is j ) is larger than the allowable charging current (Ic i, j ), the allowable charging current (Is j ) is reset to the minimum allowable charging current (Ic min ) in step S7. In this case, a plurality of unit cells 11, 12, 21, 22, the estimated current (Is j) is permissible charging current (Ic i, j) is greater than, for example, estimated current (Is j) flows battery the smallest allowable charge current in the set to the minimum allowable charging current (Ic min). Alternatively, for each battery in which the estimated current (Is j ) flows , the ratio of the estimated current (Is j ) to the allowable charging current (Ic i, j ) is calculated, and the allowable charging current corresponding to the largest ratio is calculated. The minimum allowable charging current (Ic min ) may be set.

  And it returns to step S4 and performs the process of step S4-step S6 again.

On the other hand, if the estimated current (Is j ) is less than or equal to the allowable charging current (Ic i, j ), in step S8, the control unit 20 determines the battery based on the set minimum allowable charging current (Ic min ). The charging current of the group 100 is controlled.

As described above, the battery control device of this example calculates the allowable current (Ic i, j or Id i, j ) of each of the single cells 11, 12, 21, 22 and at least one of the battery groups 1, 2. The estimated currents (Is j ) of the cells 11, 12, 21, and 22 included in the battery rows 1 and 2 of the first and second battery rows 1 and 2 are estimated, and the allowable current (Ic i, j or Id i, j ) and the estimated current (Is j ) The charge / discharge current of the battery group 100 is controlled according to the comparison result. As a result, in each of the unit cells 11, 12, 21, and 22, the charge / discharge current is not controlled based on only the minimum allowable charge current (Ic min ) or the minimum allowable discharge current (Id min ). Since the current is controlled after confirming the possibility of discharge or overcharge, overdischarge or overcharge can be prevented.

That is, for example, as in the conventional case, the allowable current (Ic i, j or Id i, j ) of each single cell 11, 12, 21, 22 is calculated, and the minimum allowable current is extracted from a plurality of allowable currents. Based on the extracted minimum allowable current, the charging / discharging current of the battery group 100 is set. In such a case, the flowing current is suppressed to be equal to or less than the allowable current in the battery for which the minimum allowable current is set. However, in battery arrays including other series batteries, the flowing current may exceed the allowable current, and there is a risk of overcharge or overdischarge in the battery array.

  In this example, a minimum allowable current is set, and an estimated current flowing through another battery array is calculated based on the minimum allowable current. Therefore, when the minimum allowable current is supplied, the current actually flowing through the other battery is confirmed. be able to. Thereby, in this example, overdischarge or overcharge can be prevented.

  Moreover, this example performs the said process using the internal resistance and open circuit voltage of each cell 11, 12, 21, 22. The unit cells 11, 12, 21, and 22 may vary depending on the use of the battery. When the charge / discharge current is controlled based on only the minimum allowable current as in the prior art, the current that actually flows through each of the single cells 11, 12, 21, and 22 varies depending on the battery state. In this example, the control can be performed after the influence due to the variation is reflected in the above arithmetic expression. Therefore, even if the battery has variations, overdischarge or overcharge can be prevented.

The present example, the allowable current of each battery 11, 12, 21 and 22 (Ic i, j or Id i, j) of, based on the minimum allowable current (Ic min or Id min), the battery array 1 The inter-terminal voltage (V j ) is calculated, and the estimated current (Is j ) flowing in the battery array that does not include the single cells 11, 12, 21, 22 corresponding to the minimum allowable current (Ic min or Id min ) is estimated. . As a result, the current that actually flows in the battery row other than the battery row that includes the single cell that is the basis for setting the minimum allowable current (Ic min or Id min ) may be estimated, resulting in overdischarge or overcharge. It can be confirmed whether or not there is. Thereby, this example can suppress overdischarge or overcharge.

The present embodiment, the estimated current (Is j) is permissible current (Ic i, j or Id i, j) is greater than, based on the allowable current (Ic i, j or Id i, j), again, The estimated current (Is j ) is estimated, the allowable current (Ic i, j or Id i, j ) is compared with the estimated current (Is j ) estimated again, and the allowable current (Ic i, j or Id) is compared. i, j ) or the estimated current (Is j ) estimated again is used to control the charge / discharge current. As a result, overdischarge or overcharge occurs in the unit cells 11, 12, 21, 22 other than the unit cells 11, 12, 21, 22 corresponding to the minimum allowable current (Ic min or Id min ) set in step S3. In the case where there is a possibility, the current that is the reference for setting the charging / discharging current is further lowered, and again the possibility of overdischarge or overcharge in each of the unit cells 11, 12, 21, 22 is confirmed. Can do. As a result, this example can suppress overdischarge or overcharge.

In step S8, when the process of step S8 is performed after the process of step S7, the charging current is set based on the allowable charging current (Ic i, j ). In such a case, the inter-terminal voltage based on the allowable charging current (Ic i, j ) and the inter-terminal voltage based on the estimated current (Is j ) estimated in step S5 and the allowable charging current (Ic i, j ) are the same voltage. Therefore, the charging current may be set based on the estimated current (Is j ) estimated in step S5.

  In this example, the open circuit voltage and the internal resistance are calculated based on the IV linear characteristic, but are not necessarily the IV linear characteristic, and may be calculated using, for example, an approximate function based on a quadratic curve, or may be another method.

  In addition, the battery group 100 of this example is connected in two rows in parallel, but may be three or more rows.

Further, in this example, in addition to the above control, the heat generation amount of each of the single cells 11, 12, 21, and 22 may be calculated, and the charge / discharge current may be limited according to the calculated heat generation amount. That is, in order to protect the batteries, the unit cells 11, 12, 21, and 22 are set in advance with a heat generation amount threshold value (allowable heat generation amount) corresponding to the battery temperature. When the unit cells 11, 12, 21, and 22 are charged or discharged beyond the allowable heat generation amount, it is determined that there is a possibility that the temperature of the battery exceeds the threshold temperature and the battery performance may be hindered. . The amount of heat generated is calculated from the current flowing through each unit cell and the internal resistance. Therefore, in this example, the allowable current (Ic i, j or Id i, j) from the internal resistance, and calculating the amount of heat generated in the battery corresponding to the allowable current (Ic i, j or Id i, j), the estimated current From the (Is j ) and the internal resistance, the amount of heat generated in the battery corresponding to the estimated current (Is j ) is calculated. In this example, the heat generation amount and the allowable heat generation amount are compared for each of the cells 11, 12, 21, and 22. In the case where a unit cell whose calorific value exceeds the allowable calorific value is present in the battery group 100, in this example, the charge / discharge current set in step S8 is limited. Thereby, this example can protect each unit cell 11, 12, 21, and 22 with respect to the heat | fever which arises by sending charging / discharging electric current.

  In addition, what is necessary is just to set the electric current amount which restrict | limits charging / discharging electric current according to the calorific value calculated with respect to the allowable calorific value. Further, when the heat generation amount exceeds the allowable heat generation amount, the battery group 100 may be controlled not to be charged / discharged.

  The battery controller 10 and the control unit 20 may be a single control unit.

The allowable charging current (Ic i, j ) and the allowable discharging current (Id i, j ) in this example correspond to the “allowable current” of the present invention, and the voltage between the terminals is (V j ) “first voltage”. The battery controller 10 corresponds to “battery state management means”, and the control unit 20 corresponds to “control means”.

<< Second Embodiment >>
A sound source position calculation apparatus and a sound source position calculation method according to another embodiment of the invention will be described. This example differs from the first embodiment described above in part of the control content. About other parts, description of 1st Embodiment is used suitably.

The battery controller 10 of the present example calculates the allowable charging current (Ic i, j ) or the allowable discharging current (Id i, j ) for each of the cells 11, 12, 21, 22 calculated using Equation 1 and Equation 2. from), the minimum allowable charging current for each battery array 1, 2 (Ic min, j) or minimum allowable charge current (Id min, j) to extract, the minimum allowable charging current (Ic min, j) or the minimum allowable charge (V j ) is calculated from the current (Id min, j ) as the terminal voltage for each of the battery arrays 1 and 2.

The extraction of the minimum allowable charging current (Ic min, j ) or the minimum allowable charging current (Id min, j ) is performed by extracting the allowable charging currents of the single cells 11, 12, 21, 22 connected to each of the battery rows 1 and 2 ( Ic i, j) or allowable discharge current (Id i, from among j), the smallest value of the permissible charging current (Ic i, j) or allowable discharge current (Id i, a j), the minimum allowable charge current (Ic min, j ) or the minimum allowable charging current (Id min, j ).

The terminal voltage (V j ) for each of the battery arrays 1 and 2 is based on the minimum allowable charging current (Ic min, j ) or the minimum allowable charging current (Id min, j ) using Expression 3 and Expression 4. Calculated.

That is, when the allowable current is different for each of the single cells 11, 12, 21, 22, if the minimum allowable current is estimated and passed separately for each of the battery rows 1, 2, the inter-terminal voltage for each of the battery rows 1, 2 Is different. And as long as the voltage between terminals calculated for every battery row | line applies the voltage below the said voltage between the said terminals, possibility that the cell 11, 12, 21, 22 will be overdischarged or overcharged is suppressed. Among the different inter-terminal voltages, when the smallest inter-terminal voltage (V min, j ) is extracted, the battery strings 1 and 2 do not correspond to the minimum inter-terminal voltage (V min, j ). Since a voltage equal to or lower than the inter-terminal voltage calculated every time is applied, the possibility of overdischarge or overcharge is suppressed in all the unit cells 11, 12, 21, 22.

Therefore, in this example, the inter-terminal voltage (V j ) for each of the battery arrays 1 and 2 is calculated based on the allowable current (Ic i, j or Id i, j ), and the minimum inter-terminal voltage (V min, j ) is calculated. The charging / discharging current is controlled based on the minimum allowable charging current (Ic min, j ) of the corresponding battery groups 1 and 2. Thereby, this example can suppress the possibility of overdischarge or overcharge in the cells 11, 12, 21, 22.

Next, the battery controller 10 calculates the smallest inter-terminal voltage (V min, j ) from the inter-terminal voltage (V j ) for each of the battery rows 1 and 2. Then, the battery controller 10 and the control unit 100 determine the minimum allowable charging current (Ic min, j ) or the minimum allowable charging current (Id min, ) in the battery rows 1 and 2 corresponding to the smallest inter-terminal voltage (V j ) . j ), the charge / discharge current of the battery group 100 is controlled.

  Next, the control procedure of the battery control device of this example will be described with reference to FIG. FIG. 3 is a flowchart showing a control procedure of the battery control device of this example when setting the charging current. In addition, about the control procedure of discharge, since the basic control procedure is the same as that of charge, description is abbreviate | omitted.

First, in step S <b> 11, the battery controller 10 determines the internal resistances of the single cells 11, 12, 21, 22 based on the detected voltages and detected currents of the voltage sensors 31, 32, 33, 34 and the current sensors 41, 42. R i, j ) and the open circuit voltage (E i, j ) are calculated.

In step S <b> 12, the battery controller 10 calculates the allowable charging current (Ic i, j ) of each single cell 11, 12, 21, 22 using Equation 1.

Next, in step S13, the minimum allowable charging current (Ic i, j ) is extracted for each of the battery arrays 1 and 2 from the allowable charging current (Ic i, j ) calculated in step S12. Set to the minimum allowable charging current (Ic min, j ).

In step S < b> 14, the battery controller 10 calculates the inter-terminal voltage (V j ) for each of the battery rows 1 and 2 using Equation 3. In step S15, the minimum inter-terminal voltage (V min, j ) is extracted from the inter-terminal voltage (V j ) group calculated in step S14.

In step S16, the control unit 20 controls the charging current of the battery group 100 based on the minimum allowable charging current (Ic min, j ) of the battery group corresponding to the minimum voltage (V min, j ) between the terminals. To do.

As described above, the battery control device of this example calculates the allowable current (Ic i, j or Id i, j ) of each unit cell 11, 12, 21, 22 and the allowable current (Ic i, j or Based on Id i, j ), the inter-terminal voltage (V j ) for each of the battery arrays 1 and 2 is calculated, the minimum inter-terminal voltage (V min, j ) is extracted, and the minimum inter-terminal voltage (V min, j ) is obtained. The charging / discharging current is controlled based on the minimum allowable charging current (Ic min, j ) of the corresponding battery groups 1 and 2. As a result, in each of the unit cells 11, 12, 21, and 22, the charge / discharge current is not controlled based on only the minimum allowable charge current (Ic min ) or the minimum allowable discharge current (Id min ). Since the current is controlled after confirming the possibility of discharge or overcharge, overdischarge or overcharge can be prevented.

DESCRIPTION OF SYMBOLS 100 ... Battery group 1, 2 ... Battery row 10 ... Battery controller 20 ... Control part 31, 32, 33, 34 ... Voltage sensor 41, 42 ... Current sensor R1,1 , R2,1 , R1,2 , R 2, 2 ... Internal resistance E 1,1 , E 2,1 , E 1 , 2 , E 2,2 ... Open circuit voltage

Claims (8)

  1. A battery group in which a plurality of battery rows in which a plurality of batteries are connected in series are arranged in parallel;
    Battery state management means for managing the state of each battery included in the battery group;
    Control means for controlling the current of each battery,
    The battery state management means includes
    Calculate the internal resistance and open circuit voltage of each battery,
    Based on the internal resistance and open circuit voltage, the allowable current of each battery is calculated,
    Based on the allowable current, a first voltage applied to one battery row among the plurality of battery rows is calculated,
    Based on the first voltage, an estimated current flowing in a battery included in another battery row among the plurality of battery rows is estimated,
    Each of the allowable current and the estimated current corresponding to the batteries included in the other battery row,
    When the estimated current is larger than the corresponding allowable current, the second voltage applied to the one battery string is calculated based on the allowable current corresponding to the battery included in the other battery string,
    The battery control apparatus, wherein the control means controls the current of each battery based on the second voltage .
  2. The battery state management means includes
    Based on the smallest allowable current among the allowable currents of each battery, the first voltage is calculated,
    2. The battery control device according to claim 1, wherein the estimated current flowing through a battery included in the other battery array not including a battery corresponding to the smallest allowable current is estimated based on the first voltage. .
  3. The said control means controls the electric current of each said battery based on the said permissible current corresponding to the battery of the said one battery row | line | column, when the said permissible current is larger than the said estimated current corresponding. The battery control device according to 1 or 2.
  4. The battery state management means includes
    Based on the second voltage, an estimated current of a battery included in the one battery row is estimated,
    Comparing the allowable current and the estimated current corresponding to the batteries included in the one battery row,
    The control means controls the current of each battery based on the allowable current corresponding to a battery included in the other battery array or the estimated current corresponding to a battery included in the one battery array. The battery control device according to claim 1 or 2.
  5. Voltage detecting means for detecting a voltage of a battery included in the battery group;
    A current detecting means for detecting a current of a battery included in the battery group;
    The battery state management means includes
    5. The internal resistance and the open-circuit voltage are calculated based on a detection voltage detected by the voltage detection unit and a detection current detected by the current detection unit. 6. The battery control device described in 1.
  6. The battery state management means includes
    Based on the preset allowable voltage of each battery, the allowable current is calculated,
    6. The battery control device according to claim 1, wherein the estimated current is calculated based on the allowable voltage.
  7. The battery state management means includes
    Based on the allowable current, the estimated current, and the internal resistance, the calorific value of each battery is calculated,
    Compare the calorific value of each battery with the preset allowable calorific value of each battery,
    The said control means restrict | limits the electric current of each battery based on the said allowable heat generation amount, when the said heat generation amount is higher than the said allowable heat generation amount. Battery control device.
  8. A battery group in which a plurality of battery rows in which a plurality of batteries are connected in series are arranged in parallel;
    Battery state management means for managing the state of each battery included in the battery group;
    Control means for controlling the current of each battery,
    The battery state management means includes
    Calculate the internal resistance and open circuit voltage of each battery,
    Based on the open circuit voltage and the internal resistance, to calculate the allowable current of each battery,
    Based on the allowable current, a first voltage applied to each of the plurality of battery rows is calculated,
    Extracting the allowable current corresponding to the smallest first voltage among the first voltages applied to the plurality of battery rows;
    The battery control apparatus, wherein the control means controls the current of each battery based on the allowable current extracted by the battery state management means.
JP2010189444A 2010-08-26 2010-08-26 Battery control device Expired - Fee Related JP5585308B2 (en)

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