JP2015118787A - Battery controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress output of a battery at an appropriate timing.SOLUTION: A battery controller 10 controls the output from a battery 20 to a motor 30 being driven with power stored in the battery 20. Output control means 128 determines whether or not the deterioration X of the battery 20 is less than a threshold degree of deterioration X, determined based on the charging rate S, and performs normal output where the output from the battery 20 is a request output P if the deterioration X is less than the threshold degree of deterioration X, otherwise performs output suppression for making the output from the battery 20 less than the request output P.

Description

  The present invention relates to a battery control device that controls output of a battery.

Conventionally, in an electric vehicle that travels by driving a motor using electric power stored in a battery, output suppression is performed to limit the original power performance (motor output performance) when the battery is in a predetermined state. ing. Such output suppression is performed, for example, when a battery state of charge (SOC) decrease, a battery temperature increase, a battery deterioration, or the like occurs.
For example, in Patent Document 1 below, the battery control unit obtains a depth of discharge representing the current degree of discharge with respect to the output power when the battery is fully charged, and the output of the battery is determined according to the calculated depth of discharge. Obtain the output limit start temperature that starts the power limit. If the battery temperature detected by the temperature detector is larger than the output limit start temperature, the output limit value is set to limit the output power of the battery according to the battery temperature. Based on this, the output power of the battery is limited.

Japanese Patent No. 3757602

  In the above-described conventional technology, output suppression is performed based on the relationship between the battery temperature and the battery charge rate, but the point of output suppression based on the relationship between the battery deterioration degree and the battery charge rate is not considered.

  The present invention has been made in view of the above-described problems of the related art, and an object of the present invention is to suppress battery output at an appropriate timing.

In order to solve the above-described problems and achieve the object, a battery control device according to a first aspect of the invention is a battery control for controlling an output from the battery to a load device that is driven using electric power stored in the battery. A request output acquisition means for acquiring a request output from the load device; a deterioration degree detection means for detecting a deterioration degree of the battery; a charge rate detection means for detecting a charge rate of the battery; Output control that determines whether or not the degree of deterioration is less than a threshold degree of deterioration determined based on the charging rate, and performs output suppression to make the output less than the required output when the degree of deterioration is equal to or higher than the threshold degree of deterioration. And means.
The battery control device according to the invention of claim 2 is characterized in that the threshold deterioration degree is set to a smaller value as the charging rate is lower.
According to a third aspect of the present invention, there is provided a battery control device comprising a notifying means for notifying that the output suppression may be performed when the deterioration level is equal to or higher than the threshold deterioration level.
In the battery control device according to a fourth aspect of the invention, the output control means sets an upper limit value of the output when the output is suppressed, and when the requested output exceeds the upper limit value, the output is set to the requested output. On the other hand, a value obtained by multiplying a coefficient less than 1 is used, and when the required output is less than or equal to the upper limit value, the output is set as the required output.
In the battery control device according to the invention of claim 5, a plurality of the threshold deterioration degrees are set with respect to the charging rate, and the output control means is configured to further reduce the deterioration degree among the plurality of threshold deterioration degrees. The upper limit value is decreased as the value exceeds a larger value.
In the battery control device according to the sixth aspect of the invention, when the deterioration degree exceeds the threshold deterioration degree, the notification unit notifies the plurality of threshold deterioration degrees in an identifiable manner. It is characterized by that.

According to the first aspect of the present invention, output suppression is performed based on the degree of deterioration of the battery and the charging rate, so that it is possible to suppress the output of the battery at an appropriate timing.
According to the invention of claim 2, since the threshold deterioration degree is set to a lower value as the battery charging rate is lower, it is possible to easily shift to output suppression in a situation where the battery charging rate is low and high output is difficult. . In addition, it is possible to start suppression of battery output at an appropriate time by linking the charging rate and the degree of deterioration, which are a major factor that reduces the output of the battery.
According to the third aspect of the present invention, when the output suppression is performed based on the degree of deterioration of the battery and the charging rate, the notification device for notifying that the output suppression may be performed is provided. The user (driver) can recognize the possibility of output suppression before actual output suppression is performed, and calmly continue operation of the load device even if the load device does not operate as intended due to output suppression can do.
According to the invention of claim 4, when the output is suppressed, an upper limit value (output upper limit value) is set, and when the requested output exceeds the upper limit value, the output from the battery is made less than the requested output, and the requested output is the output upper limit. If it is less than the value, the output from the battery is used as the requested output. Thereby, the degree of output suppression can be changed by changing the output upper limit value, and the degree of freedom of control in the battery control device can be improved.
According to the invention of claim 5, a plurality of threshold deterioration degrees are set, and the output upper limit value is lowered as the threshold deterioration degree is larger, so that the output can be suppressed step by step and matched to the state of the battery. The output can be controlled finely.
According to the invention of claim 6, since the battery deterioration level is notified in an identifiable manner below which of the plurality of threshold deterioration levels, the user can determine in advance what level of output suppression is performed. For example, it is possible to recognize the timing of performing an operation on the load device or performing maintenance on the battery.

It is explanatory drawing which shows the structure of the battery control apparatus 10 concerning embodiment. It is an example of the output determination map which the output control means 130 hold | maintains. It is an example of the output determination map reflecting actual output suppression. It is explanatory drawing which shows an example of the output calculation method at the time of output suppression. 4 is a flowchart showing processing of the battery control device 10. 10 is an example of an output determination map in the second embodiment. 10 is an explanatory diagram illustrating an example of an output calculation method according to Embodiment 2. FIG. 6 is a flowchart illustrating processing of the battery control device 10 according to Embodiment 2.

  Exemplary embodiments of a battery control device according to the present invention will be described below in detail with reference to the accompanying drawings.

(Embodiment 1)
FIG. 1 is an explanatory diagram illustrating a configuration of a battery control device 10 according to the embodiment.
In the present embodiment, a motor 30 that drives an electric vehicle is taken as an example of a load device that is driven using electric power stored in the battery 20, and the battery control device 10 is mounted on the electric vehicle. .
The battery control device 10 according to the embodiment controls the output from the battery 20 to the motor 30 that is driven using the electric power stored in the battery 20.
The battery 20 is an assembled battery in which a plurality of battery cells are connected in series, and is charged by receiving external power from a charging port (not shown).
The electric power stored in the battery 20 is supplied to the motor 30 via the power line _L. The battery 20 may supply power to other load devices (for example, an air conditioner for an electric vehicle) in addition to the motor 30.

A voltage sensor 114 and a current sensor 116 are connected to the battery 20.
The voltage sensor 114 measures the battery voltage V of the battery 20. The voltage sensor 114 measures a cell voltage that is a voltage of each battery cell constituting the battery 20, for example.
The current sensor 116 measures the current I supplied from the battery 20 to the motor 30.

The battery control device 10 includes a processing unit 12 and a notification unit 14.
The processing unit 12 includes a CPU, a ROM that stores and stores a control program, a RAM as an operation area of the control program, an EEPROM that holds various data in a rewritable manner, an interface unit that interfaces with peripheral circuits, and the like. Composed.
The processing unit 12 is, for example, an ECU that controls the entire electric vehicle or a BMU (Battery Management Unit) that controls the battery 20.
Note that the processing unit 12 is not an ECU or a BMU alone, and may perform processing described later in cooperation with each other.

The processing unit 12 includes a request output acquisition unit 120, a charging rate detection unit 124, a deterioration degree detection unit 126, and an output control unit 128.
The request output acquisition unit 120 acquires a request output P from the motor 30 that is a load device.
The request output acquisition means 120 detects the amount of operation of the accelerator pedal 26 by the driver, for example, and the number of rotations of the motor 30 corresponding to the amount of accelerator operation and the amount of electric power to be supplied to the motor 30 to realize the number of rotations. Is calculated as the required output P.
The charging rate detection unit 124 detects the charging rate S (SOC) of the battery 20.
The charging rate detection unit 124 stores, for example, an SOC map indicating the relationship between the charging rate of the battery 20 and the battery voltage, and reads the value of the charging rate corresponding to the battery voltage measured by the voltage sensor 114 from the SOC map. In addition, when the cell voltage is measured by the voltage sensor 114, the charging rate detection means 124 uses the average value of the cell voltage as the battery voltage. Calculation of the battery voltage V from the cell voltage may be performed by the voltage sensor 114. In this case, the charging rate detection unit 124 acquires the value of the battery voltage V calculated by the voltage sensor 114 and calculates the charging rate S of the battery 20.
The deterioration degree detection unit 126 detects the deterioration degree X of the battery 20.
Deterioration degree detection means 126 obtains the internal resistance and open-circuit voltage of battery 20 based on, for example, battery voltage V measured by voltage sensor 114 and current I measured by current sensor 116, and the battery is based on these values. 20 current maximum outputs are calculated. Then, the degree of deterioration X is calculated by comparing the calculated current maximum output with the maximum output of the battery 20 in the initial state (when the degree of deterioration is 0). The deterioration of the battery 20 is known to be aged deterioration that is proportional to the years from the start of use and the use deterioration that is proportional to the frequency of use. The deterioration degree detection unit 126 determines the deterioration of the battery 20 by combining these deteriorations. Degree X is detected.

The output control means 130 controls the output from the battery 20 to the motor 30 based on the deterioration degree X of the battery 20, the charging rate S of the battery 20, and the requested output P.
Specifically, the output control unit 130 determines whether threshold degradation level X _L below whether the deterioration degree X of the battery 20 is determined based on the charging rate S, the deterioration degree of X is the threshold degradation level X _L or more In this case, output suppression is performed so that the output from the battery 20 is less than the required output P.
Further, the output control unit 130, in this embodiment, when the deterioration degree X is less than the threshold degree of degradation X _L and the required output P of the output from the battery 20. In this manner, the output form in which the output from the battery 20 = the requested output P is hereinafter referred to as “normal output”.
Here, conventionally, when the charging rate S of the battery 20 decreases, it is known to suppress output for the purpose of extending the cruising distance or the like.
In general, it is known that the battery performance decreases as the battery 20 deteriorates. That is, when the deterioration degree of the battery 20 is high, the output is reduced as compared with the case where the battery 20 is new. Therefore, the output control unit 130 performs the output suppression when the deterioration degree X of the battery 20 is less than the threshold value degradation degree X _L, and controls the output from the battery 20 within the performance range of the battery 20.

FIG. 2 is an example of an output determination map held by the output control unit 130.
In FIG. 2, the vertical axis represents the deterioration degree X of the battery 20, and the horizontal axis represents the charging rate S (SOC). The degree of deterioration X on the vertical axis is expressed as a percentage, and is smaller (closer to 0%) on the upper side of the vertical axis and larger (closer to 100%) on the lower side of the vertical axis. That is, 0% degradation indicates that the battery 20 is in a new state, and 100% degradation indicates the state in which the battery 20 is most degraded.
Output control unit 130 identifies a threshold degradation level X _L on the output determination map based on the charging rate S, determines whether the deterioration degree X of the battery 20 is the threshold degradation level X _L or more.
As shown in FIG. 2, the threshold deterioration degree _XL is smaller as the charging rate S is lower. That is, when the charging rate S is low, output suppression is started while the deterioration degree X is low.
If the deterioration degree X of the battery 20 is not less than the threshold value degradation degree X _L, corresponding to the normal output area of output decision map, it performs normal output to output = required output from the battery 20. On the other hand, when the deterioration degree X of the battery 20 is less than the threshold value degradation degree X _L, corresponding to the output suppression area of the output decision map, performs output suppression to output <request output from the battery 20.
That is, the output control means 130 plots a point where the charging rate S and the deterioration degree X of the battery 20 intersect on the output determination map shown in FIG. 2, and whether the plot is in the normal output area or the output suppression area. To determine whether or not to suppress output.
2 is read as a graph of the threshold charge rate of the charge rate S, the threshold charge rate is specified based on the deterioration degree X of the battery, and it is determined whether or not the charge rate S of the battery 20 is equal to or higher than the threshold charge rate. Of course, it's also good.

FIG. 4 is an explanatory diagram illustrating an example of an output calculation method when output is suppressed.
In FIG. 4, the vertical axis is a coefficient (gain) K in the range of 0 to 1, and the horizontal axis is the accelerator opening (accelerator operation amount). Note that the accelerator opening on the horizontal axis can be controlled by the magnitude of the required output P from the motor 30.
The output control unit 128 sets a value obtained by multiplying the required output P from the load device by a coefficient K shown on the vertical axis in FIG. In the graph shown in FIG. 4, when the accelerator opening is 0% or more and less than 80%, the coefficient K = 1, that is, the requested output is used as the output from the battery 20 as it is. On the other hand, when the accelerator opening is 80% or more and 100% or less, a coefficient K that decreases in proportion to the accelerator opening is multiplied by the required output. In other words, the greater the required output, the greater the degree of output suppression. By such a method, the output from the battery 20 is suppressed within the output performance range of the battery 20.
That is, the output control means 128 sets an upper limit value (output upper limit value P _MX : accelerator opening 80% in FIG. 4) at the time of output suppression, and outputs when the requested output P exceeds the output upper limit value P _MX. Is a value obtained by multiplying the required output P by a coefficient K less than 1, and when the required output P is less than or equal to the output upper limit value P _MX , the output is the required output P.
As another method for determining the output at the time of output suppression, for example, an upper limit output from the battery 20 is determined, and when the requested output from the load device exceeds the upper limit output, the upper limit output is uniformly output. May be.

Here, in actual control, low SOC suppression as shown in FIG. 3 is performed in addition to the above-described output suppression.
That is, when the charging rate S is equal to or lower than the lower limit charging rate S _MIN , the charging rate S of the battery 20 approaches 0%, and there is a possibility of overdischarge, so low SOC suppression that limits the output is performed.
Although not shown in FIG. 3, when the battery temperature T is equal to or higher than the upper limit temperature T _MX , high temperature suppression is performed to limit the output because the battery 20 is in a high temperature state and may have a failure or the like.
Since these high temperature suppression and low SOC suppression perform control different from output suppression in this embodiment, for example, the electric vehicle is put in a limp home state, the description thereof is omitted in this embodiment.

Referring back to FIG. 1, the notification unit 14 notifies that there is a possibility that the output suppression is performed when the deterioration degree X of the battery 20 is not less than the threshold value degradation degree X _L.
As mentioned above, the actual output suppression is performed is a case where the deterioration degree X of the battery 20 is the threshold degradation level X _L or more and the required output P of the output upper limit value P _MX exceeds. On the other hand, the notification means 14, when the deterioration degree X of the battery 20 is not less than the threshold value degradation degree X _L performs the notification to the driver as potentially output restriction is performed. As a result, even when acceleration intended by the driver cannot be achieved by suppressing the output, the driver is more likely to drive calmly.
Specifically, the notification unit 14 is, for example, a warning light or a display in the instrument panel, a speaker that outputs sound, and the like, and a plurality of these may be combined. When there is a possibility of output suppression, the notification unit 14 turns on a warning lamp, displays a message or icon indicating that output suppression may be performed on the display, or the above message. Is output as audio.
Moreover, the alerting | reporting means 14 may alert | report how much throttle opening (request | requirement output P) performs output suppression. For example, a message or voice may be output or an “80%” icon or the like may be displayed as “the output is limited when the accelerator opening exceeds 80%”.

FIG. 5 is a flowchart showing processing of the battery control device 10.
First, the battery control device 10 detects the charging rate S of the battery 20 by the charging rate detection means 124 (step S10). Moreover, the battery control apparatus 10 detects the deterioration degree X of the battery 20 by the deterioration degree detection means 126 (step S12).
Next, the battery controller 10, the output control unit 128 identifies a threshold degradation level X _L based on the charging rate S, determines whether the deterioration degree X of the battery 20 is the threshold value degradation degree X _L or more (Step S14). If the deterioration degree X is not a threshold degradation level _{X L} or more (step S14: No), the process proceeds to step S24, performs a normal output to the output of the required output as it is from the battery 20 (step S24).
On the other hand, if the degradation degree X is the threshold value degradation degree X _L or more (step S14: Yes), the output suppression by the notification unit 14 to notify the driver of that there is likely to be performed (step S16).
Subsequently, the request output of the motor 30 is acquired by the request output acquisition means 120 (step S18), and it is determined whether or not the request output exceeds the upper limit value of the output by the output control means 128 (step S20).
If the requested output exceeds the upper limit of the output (step S20: Yes), output suppression is performed so that the output from the battery 20 is less than the requested output (step S22). On the other hand, when the requested output does not exceed the upper limit value of the output (step S20: No), the normal output using the requested output as it is as the output from the battery 20 is performed (step S24).
Thereafter, the battery control device 10 returns to step S10 and repeats the subsequent processing.

As described above, since the battery control device 10 according to the embodiment performs output suppression based on the deterioration degree X and the charging rate S of the battery 20, the output suppression of the battery 20 can be performed at an appropriate timing. it can.
The battery controller 10, the charging rate S of the battery 20 is in the low threshold degradation level X _L as low, high output is shifted to the output suppressed in difficult situations lower charging rate S of the battery 20 is It can be made easier. Further, by linking the charging rate S and the degree of deterioration X, which is a major factor that reduces the output of the battery 20, it is possible to start suppressing the output of the battery at an appropriate time.
In addition, since the battery control device 10 includes the notification unit 14 that notifies that there is a possibility of output suppression when performing output suppression based on the deterioration degree X and the charging rate S of the battery 20, The driver who is the user of the load device can recognize the possibility of the output suppression before the output suppression is actually performed, and settles down even when the motor 30 does not perform the intended operation due to the output suppression. The operation of the (electric vehicle) can be continued.
Further, the battery control device 10 sets an output upper limit value (output upper limit value P _MX ) when the output is suppressed, and if the requested output P exceeds the output upper limit value P _MX , the output from the battery 20 is less than the requested output P. If the requested output P is less than or equal to the output upper limit value P _MX , the output from the battery 20 is used as the requested output. Thereby, the degree of output suppression can be changed by changing the output upper limit value P _MX, and the degree of freedom of control in the battery control device 10 can be improved.

(Embodiment 2)
In the first embodiment, it is determined whether to suppress output according to the state of the battery 20.
In the second embodiment, the degree of output suppression at the time of output suppression is changed according to the state of the battery 20.
In the following description, the same components as those in Embodiment 1 are denoted by the same reference numerals, and detailed description thereof is omitted.

FIG. 6 is an example of an output determination map in the second embodiment.
In FIG. 6, the vertical axis represents the degree of deterioration of the battery 20, and the horizontal axis represents the charging rate (SOC).
In the output determination map of FIG. 6, two threshold deterioration degrees (first threshold deterioration degree X _L1 and second threshold deterioration degree X _L2 ) are set.
The first threshold deterioration degree X _L1 and the second threshold deterioration degree X _L2 are both smaller as the charging rate S is lower, and the second threshold deterioration degree X _L2 is the first one. It is set on the side where the degree of deterioration is larger than the threshold degree of deterioration X _L1 (first threshold degree of deterioration X _L1 <second threshold degree of deterioration X _L2 ).
When the deterioration degree X of the battery 20 is less than the first threshold deterioration degree X _L1 , it corresponds to the normal output area, and the deterioration degree X is equal to or more than the first threshold deterioration degree X _L1 and less than the second threshold deterioration degree X _L2 . The case corresponds to the first output suppression area, and the deterioration degree X corresponds to the second output suppression area when the deterioration degree X is equal to or greater than the second threshold deterioration degree _XL2 .
The output control means 130 specifies two threshold deterioration degrees X _L1 and X _L2 on the output determination map based on the charging rate S, and outputs normal output when the deterioration degree X is less than the first threshold deterioration degree X _L1. When the deterioration degree X is equal to or higher than the first threshold deterioration degree X _L1 and less than the second threshold deterioration degree X _L2, the first output suppression is performed. When the deterioration degree X is equal to or higher than the second threshold deterioration degree X _L2 Second output suppression is performed.

FIG. 7 is an explanatory diagram illustrating an example of an output calculation method according to the second embodiment.
In FIG. 7, the vertical axis is a coefficient (gain) in the range of 0 to 1, and the horizontal axis is the accelerator opening (accelerator operation amount). It should be noted that the accelerator opening on the horizontal axis can be controlled by the magnitude of the required output from the motor 30.
In FIG. 7, two coefficient curves M1 and M2 are shown. The coefficient curve M1 is used when the first output is suppressed. The coefficient curve M2 is used when the second output is suppressed.
The coefficient curve M1 has a coefficient of 1 when the accelerator opening is 0% or more and less than 80%, and is smaller in proportion to the accelerator opening when the accelerator opening is 80% or more and 100% or less. That is, the output upper limit value P _MX1 in the first output suppression is the accelerator opening degree 80%.
The coefficient curve M2 has a coefficient of 1 when the accelerator opening is 0% or more and less than 50%, and the coefficient is small in proportion to the accelerator opening when the accelerator opening is 50% or more and 100% or less. That is, the output upper limit value P _MX2 in the second output suppression is the accelerator opening degree 50%.
When the coefficient curve M1 and the coefficient curve M2 are compared, the accelerator opening at which the coefficient is less than 1 in the coefficient curve 2, that is, the output upper limit P (P _MX2 ) is low, and the required output P is small. Output suppression has started. Further, the coefficient curve M2 has a smaller coefficient than the coefficient curve M1 even at the same accelerator opening, and the degree of suppression of output is larger.
That is, when the first output suppression is compared with the second output suppression, the second output suppression has a greater output suppression degree.
In other words, in the second embodiment, a plurality of threshold deterioration levels X _L are set for the charging rate S, and the output control unit 128 determines that the deterioration level X of the battery 20 is a plurality of threshold deterioration levels X _L 1, X. of _{L 2,} which reduces the upper limit value of as the required output P exceeds a value greater than (second threshold degradation level X _L2 in FIG. _6).
Compared with the state of the battery 20 at the time of the first output suppression, the state of the battery 20 at the time of the second output suppression is in a state with a lower charge rate state and further deterioration, This is because it is difficult to output.
Thus, by performing output suppression in steps, an appropriate output can be set according to the state of the battery 20, and the electric power in the battery 20 can be utilized more efficiently.

In Embodiment 2, when the deterioration degree X of the battery 20 exceeds the threshold deterioration degree, the notification means 14 notifies the user whether the plurality of threshold deterioration degrees X _L1 or X _L2 are higher. . In other words, the driver is informed of whether there is a possibility of being the first output suppression or the second output suppression.
Specifically, for example, when the notification means 14 is a warning light, the color of the warning light is changed for each threshold temperature. In this case, if only the first threshold deterioration degree X _L1 is exceeded, the warning light is turned on in yellow, and if it exceeds the second threshold deterioration degree X _L2 , the warning light is turned on in red. , a display, such as attracting attention as strong as the threshold degradation level X _L increases.
Further, the notification unit 14 is a display, and if the output suppression displaying the likelihood is that a message or an icon or the like to be performed, even in the case of outputting the message by voice, as a threshold degradation level X _L increases operation Expression that strongly attracts the attention of the person.
This is because as the threshold deterioration degree _XL increases, the output of the battery 20 decreases, and as a result, there is a high possibility that the driving intended by the driver cannot be performed.
Moreover, you may alert | report how much throttle opening (request | requirement output) is performed similarly to Embodiment 1. FIG. For example, when the first output is suppressed, a notification is made that “the output is limited when the accelerator opening exceeds 80%”, and when the second output is suppressed, “the output is exceeded when the accelerator opening exceeds 50%”. Will be limited. "
By performing such notification, the driver can grasp the state of the electric vehicle (battery 20) in more detail, and can easily take necessary measures such as charging and maintenance of the battery 20, for example.

FIG. 8 is a flowchart showing processing of the battery control device 10 according to the second embodiment.
The battery control device 10 detects the charging rate S of the battery 20 by the charging rate detection means 124 (step S30). Moreover, the battery control apparatus 10 detects the deterioration degree X of the battery 20 by the deterioration degree detection means 126 (step S32).
Next, the battery control device 10 specifies the first threshold deterioration degree X _L1 and the second threshold deterioration degree X _L2 based on the charging rate S by the output control means 128, and the deterioration degree X of the battery 20 is the first deterioration degree X. It is determined whether or not the threshold deterioration degree X _L2 is 2 or more (step S34).
When the deterioration degree X is a second threshold degradation level X _L2 or more (step S34: Yes), the second output suppression by notifying means 14 notifies the driver to the effect that may be performed ( Step S36).
Subsequently, the required output P of the motor 30 is acquired by the required output acquisition means 120 (step S38), and it is determined whether or not the required output P exceeds the second output upper limit value P _MX2 by the output control means 128 (step S38). S40).
When the requested output P exceeds the output upper limit value P _MX2 (step S40: Yes), the process proceeds to step S50, and second output suppression is performed based on the coefficient curve M2 of FIG. 7 (step S50). On the other hand, when the request output P does not exceed the second output upper limit value P _MX2 (step S40: No), the process proceeds to step S52, and normal output is performed using the request output as output from the battery 20 as it is (step S52). ).
In step S34, if the deterioration level X is not equal to or higher than the second threshold deterioration level X _L2 (step S34: Yes), whether or not the deterioration level X of the battery 20 is equal to or higher than the first threshold deterioration level X _L1 . Is determined (step S42).
When the deterioration degree of X is the first threshold degradation level X _L1 or more (step S42: Yes), the first output suppressed by informing means 14 informs the driver of the fact that there is likely to be performed ( Step S44).
Subsequently, the required output P of the motor 30 is acquired by the required output acquisition means 120 (step S46), and it is determined whether or not the required output P exceeds the first output upper limit value P _MX1 by the output control means 128 (step S46). S48).
When the requested output P exceeds the output upper limit value P _MX1 (step S48: Yes), the first output suppression is performed based on the coefficient curve M1 of FIG. 7 (step S50). On the other hand, when the requested output P does not exceed the first output upper limit value P _MX1 (step S48: No), the process proceeds to step S52, and normal output is performed using the requested output as is from the battery 20 (step S52). ).
Further, in step S42, when the deterioration degree of X is less than the first threshold value degradation degree _{X L1} (step S42: No), the process proceeds to step S52, normal output to the output of the required output as it is from the battery 20 Is performed (step S52).
Thereafter, the battery control device 10 returns to step S30 and repeats the subsequent processing.

As described above, the battery control device 10 according to the second exemplary embodiment sets a plurality of threshold deterioration levels X _L1 and X _L2, and outputs as the deterioration level X of the battery 20 exceeds the larger threshold deterioration level X _L. Since the upper limit value P _MX is lowered, the output can be suppressed in stages, and the output can be finely controlled according to the state of the battery 20.
Moreover, since the battery control apparatus 10 concerning Embodiment 2 alert | reports so that the deterioration degree X of the battery 20 is over which of the some threshold deterioration degree _XL1 and _XL2 is identifiable, how is a driver | operator? It is possible to recognize in advance whether or not a certain degree of output suppression is performed. For example, it is possible to recognize the timing of performing an operation (accelerator operation) on the load device or charging or maintaining the battery 20.

In the second embodiment, two threshold deterioration degrees X _L1 and X _L2 are set. However, three or more threshold deterioration degrees may be set to suppress output in three or more stages.
In the present embodiment, the load device is the motor 30, but the load device may be any device that is driven using the electric power stored in the battery 20. For example, an air conditioner of an electric vehicle may be used as the load device. .

  DESCRIPTION OF SYMBOLS 10 ... Battery control apparatus, 12 ... Processing part, 14 ... Notification means, 20 ... Battery, 26 ... Accelerator pedal, 30 ... Motor, 114 ... Voltage sensor, 116 ... Current sensor, 120 ... Request output acquisition means 124... Charge rate detection means 126... Deterioration degree detection means 128... Output control means 130.

Claims (6)

A battery control device that controls an output from the battery to a load device that is driven using electric power stored in the battery,
Request output acquisition means for acquiring a request output from the load device;
A deterioration degree detecting means for detecting a deterioration degree of the battery;
Charging rate detection means for detecting the charging rate of the battery;
An output for determining whether or not the deterioration degree is less than a threshold deterioration degree determined based on the charging rate, and performing output suppression to make the output less than the requested output when the deterioration degree is equal to or higher than the threshold deterioration degree. Control means;
A battery control device comprising: The threshold deterioration degree is set to a smaller value as the charging rate is lower.
The battery control device according to claim 1. A notification means for notifying that the output suppression may be performed when the deterioration level is equal to or higher than the threshold deterioration level;
The battery control apparatus according to claim 1 or 2, wherein The output control means sets an upper limit value of the output when the output is suppressed, and when the requested output exceeds the upper limit value, the output is set to a value obtained by multiplying the requested output by a coefficient less than 1. When the requested output is less than or equal to the upper limit value, the output is the requested output.
The battery control device according to claim 1, wherein the battery control device is a battery control device. A plurality of the threshold deterioration degrees are set for the charging rate,
The output control means decreases the upper limit value as the deterioration degree exceeds a larger value among the plurality of threshold deterioration degrees.
The battery control device according to claim 4. When the deterioration degree is higher than the threshold deterioration degree, the notification means notifies the identification of which of the plurality of threshold deterioration degrees is higher.
The battery control device according to claim 5.

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