JP7410020B2 - power system - Google Patents

Description

The present invention relates to a power supply system that supplies battery voltage and battery current of a plurality of batteries to a load.

A power supply system that supplies power to a load from a plurality of batteries is disclosed in, for example, Japanese Patent Application Publication No. 2015-220772, Japanese Patent Publication No. 2016-533154, Japanese Patent Application Publication No. 5-111190, and Japanese Patent Application Publication No. 2014-527689. Disclosed.

Japanese Unexamined Patent Publication No. 2015-220772 discloses that the sub-battery is equipped with a high-output and expensive first capacitor (main battery) and a plurality of inexpensive second capacitors (sub-batteries) with relatively high internal resistance. A removable power system is disclosed.

Japanese Translation of PCT Publication No. 2016-533154 discloses that a single or multiple batteries are connected in series or in parallel to supply power to an electric vehicle (load) from the batteries.

Japanese Unexamined Patent Publication No. 5-111190 discloses switching a battery whose voltage has decreased among a plurality of batteries to a battery that can be discharged.

Japanese Patent Publication No. 2014-527689 discloses that when a portable electrical energy storage device, which is a removable battery, consumes power, the portable electrical energy storage device is collected, charged, and distributed. has been done.

When multiple batteries are lent to an unspecified number of users and exchanged using the collection charge distribution device of Japanese Patent Application Publication No. 2014-527689, each of the multiple batteries may be damaged due to differences in manufacturing date or usage method. Deterioration conditions may vary. These differences in deterioration conditions result in differences in the fully charged capacity and internal resistance of the battery.

When multiple batteries with different internal resistance values are connected in parallel to the load to supply power (battery voltage and battery current) to the load, the internal resistance values are different, so each battery is discharged and the load is The battery current flowing to the battery does not flow as intended. As a result, it becomes impossible to use up the capacities of all batteries equally.

Furthermore, if there is a voltage difference between the batteries, there is a risk that a large current may momentarily flow between the batteries. Therefore, it is necessary to use a battery with a matching state of charge and state of deterioration.

Furthermore, as technology advances, it is desirable to replace the battery with a new one. However, replacing the battery may change the battery characteristics (internal resistance value, discharge voltage).

In this way, in existing power supply systems, when a plurality of batteries are connected in parallel to a load, only the same type of batteries can be used.

The present invention has been made in consideration of such problems, and it is an object of the present invention to provide a power supply system that can use batteries of different types or in different states at the same time.

An aspect of the present invention is a power supply system that supplies battery voltages and battery currents of a plurality of batteries to a load, the power supply system including a control device, an input device that inputs a requested output value to the control device, and a power supply system connected to the plurality of batteries. and an output device having an input side connected to the plurality of voltage and current control devices in parallel and an output side connected to the load.

In this case, the control device determines a required voltage value and a required current value according to the required output value required on the input side of the output device, and based on the states of the plurality of batteries and the required current value. Then, a current command value is set for each of the plurality of voltage and current control devices.

Further, the plurality of voltage and current control devices adjust the output voltage to be output to the input side of the output device to the required voltage value by boosting and lowering the battery voltage, and output the voltage to the input side of the output device. Adjust the output current to the current command value.

According to the present invention, a plurality of voltage and current control devices connected to a plurality of batteries step up and down the battery voltage based on the required voltage value and current command value set by the control device, thereby adjusting the required voltage value. The output voltage can be adjusted to compensate for the difference, and the output current can be adjusted to the current command value. This allows multiple batteries to be used at the same time even if they are of different types or in different states.

Furthermore, it is possible to efficiently use the capacity of a plurality of batteries, such as by simultaneously using up the capacity of a plurality of batteries or by using up only the capacity of a specific battery first. As a result, it is also possible to replace the battery efficiently.

FIG. 1 is a configuration diagram of a power supply system according to the present embodiment. 2 is a flowchart of the operation of the voltage and current control device of FIG. 1; 2 is a flowchart of the operation of the ECU in FIG. 1. FIG. 5 is a timing chart illustrating a step-up/step-up operation for battery voltage. 2 is a configuration diagram showing a modification of the power supply system of FIG. 1. FIG. FIG. 6 is a diagram showing the map of FIG. 5; FIG. 6 is a diagram showing the map of FIG. 5; FIG. 6 is a diagram showing the map of FIG. 5; 6 is a flowchart of the operation of the BMU of FIG. 5; 6 is a flowchart of a partial operation of the ECU of FIG. 5. FIG.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a power supply system according to the present invention will be illustrated and described with reference to the accompanying drawings.

[1. Configuration of this embodiment]
As shown in FIG. 1, the power supply system 10 according to the present embodiment includes a plurality of batteries 12, a plurality of voltage and current control devices 14, a power drive unit (PDU) 16 as an output device, an electronic control unit (ECU) 18, and an input It has a device 20. The ECU 18, the plurality of voltage and current control devices 14, and the PDU 16 are capable of transmitting and receiving signals or information via communication lines 22 and 24. The power supply system 10 is applied to, for example, an electric vehicle (object) 26 such as a two-wheeled vehicle, a three-wheeled vehicle, or a four-wheeled vehicle.

The plurality of batteries 12 are detachable batteries that can be attached to and detached from the electric vehicle 26. Specifically, each of the plurality of batteries 12 is housed in a battery pack (not shown). The plurality of batteries 12 can be attached to and detached from the electric vehicle 26 by attaching and detaching the battery pack to the electric vehicle 26. Note that the number of batteries 12 shown in FIG. 1 is an example, and the power supply system 10 may include two or more batteries 12.

The plurality of voltage and current control devices 14 are power conversion devices such as DC/DC converters. Each of the plurality of voltage and current control devices 14 has a primary side connected to any one battery 12 among the plurality of batteries 12, and a secondary side connected to the PDU 16. Accordingly, multiple voltage and current control devices 14 are connected in parallel to PDU 16. The plurality of voltage and current control devices 14 adjust the voltage (output voltage) output to the PDU 16 to a desired output voltage value by increasing and decreasing the voltage (battery voltage) of the battery 12 connected to the primary side. , adjust the current (output current) flowing through the PDU 16 to a desired output current value.

Further, the plurality of voltage and current control devices 14 control at least one of the state of the battery 12 connected to the primary side, that is, the SOC, degree of deterioration (SOH), temperature (battery temperature), and type of the battery 12. and transmits information indicating the detected state of the battery 12 to the ECU 18 via the communication line 22. For example, the plurality of voltage and current control devices 14 sequentially detect the SOC, degree of deterioration (SOH), or temperature of the battery 12 using a sensor (not shown), and transmit it to the ECU 18 via the communication line 22.

The PDU 16 includes a three-phase bridge type inverter. A plurality of voltage and current control devices 14 are connected in parallel to the input side of the PDU 16. A motor 28 of an electric vehicle 26, which is a load of the power supply system 10, is connected to the output side of the PDU 16. When the electric vehicle 26 is powered, DC power is supplied from the plurality of batteries 12 to the PDU 16 via the plurality of voltage and current control devices 14 . PDU 16 converts DC power into three-phase AC power and supplies it to motor 28 . Thereby, the motor 28 is driven, and the electric vehicle 26 can be driven. On the other hand, during regeneration of the electric vehicle 26, the PDU 16 converts AC power generated by the motor 28 into DC power. Thereby, DC power can be supplied (charged) to the plurality of batteries 12 via the plurality of voltage and current control devices 14.

The input device 20 is an accelerator operation section, a throttle operation section, etc. operated by the driver of the electric vehicle 26. For example, when the electric vehicle 26 is running due to the drive of the motor 28, when the driver operates the input device 20, an input value (required output value) corresponding to the operation amount of the input device 20 is input to the ECU 18. be done.

ECU 18 is an electronic control device for electric vehicle 26. The ECU 18 performs various processes by reading and executing programs stored in a memory (not shown). Specifically, the ECU 18 determines an output voltage value (( Determine the required voltage value) and output current value (required current value). Further, the ECU 18 causes the plurality of voltage and current control devices 14 to operate in step-up/down operation based on the states of the plurality of batteries 12 and the required current values received from the plurality of voltage and current control devices 14 via the communication line 22. Set the current command value. The ECU 18 transmits current command values and required voltage values to the plurality of voltage and current control devices 14 via the communication line 22 , and also transmits control signals to the PDU 16 via the communication line 24 .

Note that, as described above, the plurality of voltage and current control devices 14 are connected in parallel to the PDU 16. Therefore, the output voltage values of the plurality of voltage and current control devices 14 are the voltage values on the input side of the PDU 16. Therefore, the required voltage values for the plurality of voltage and current control devices 14 are the same value. On the other hand, the current value flowing to the input side of the PDU 16 is the sum of the output current values flowing from the plurality of voltage and current control devices 14. Therefore, the required current values for the plurality of voltage and current control devices 14 are different from each other depending on the states of the plurality of batteries 12.

The plurality of voltage and current control devices 14 increase or decrease the battery voltage of the connected battery 12 based on the current command value and required voltage value received from the ECU 18 via the communication line 22, thereby increasing the voltage on the input side of the PDU 16. Adjust the output voltage to the required voltage value. Further, the plurality of voltage and current control devices 14 adjust the output current output to the input side of the PDU 16 to the current command value by step-up/step-down operations on the battery voltage.

[2. Operation of this embodiment]
The operation of the power supply system 10 according to the present embodiment configured as described above will be described with reference to the flowcharts in FIGS. 2 and 3 and the timing chart in FIG. 4. This operation will be explained with reference to the configuration diagram in FIG. 1 as necessary. Here, the operations of the plurality of voltage and current control devices 14 (steps S11 to S16 in FIG. 2 and FIG. 4) and the operation of the ECU 18 (steps S21 to S26 in FIG. 3) when the electric vehicle 26 is running will be mainly described. .

When the electric vehicle 26 starts traveling, in step S11 in FIG. and sends it to the ECU 18. After the transmission to the ECU 18, the plurality of voltage and current control devices 14 are in a state of waiting to receive a signal or information from the ECU 18.

On the other hand, the ECU 18 acquires the states of the plurality of batteries 12 from the plurality of voltage and current control devices 14 in step S21 of FIG.

In the next step S22, when the driver operates the input device 20 while the electric vehicle 26 is traveling, an input value corresponding to the amount of operation of the input device 20 is input to the ECU 18. The ECU 18 calculates a required load value for the motor 28 from the input value.

In step S23, the ECU 18 determines the required voltage value and required current value required on the input side of the PDU 16 based on the load request value.

In step S24, the ECU 18 determines a current command value for each of the plurality of voltage and current control devices 14 based on the states of the plurality of batteries 12 and the required current values. In this case, the ECU 18 determines a plurality of current command values that are mutually different current values by distributing the required current value according to the states of the plurality of batteries 12. For example, in the configuration of the power supply system 10 shown in FIG. 1, if the required current value is 50A, the ECU 18 sets the current command value for each of the three voltage and current control devices 14 to 30A, 15A, and 5A. (30A+15A+5A=50A).

In step S25, the ECU 18 transmits the current command value and the required voltage value to the plurality of voltage and current control devices 14 via the communication line 22.

In the next step S26, the ECU 18 determines whether or not the electric vehicle 26 has finished traveling. Specifically, the ECU 18 determines whether the electric vehicle 26 has finished traveling by checking whether the driver has turned off the main switch of the electric vehicle 26.

If the electric vehicle 26 is running (step S26: NO), the ECU 18 returns to step S21 and executes the processes of steps S21 to S26 again. On the other hand, if the electric vehicle 26 finishes traveling (step S26: YES), the ECU 18 ends the process of FIG. 3. Therefore, the ECU 18 repeatedly executes the process shown in FIG. 3 while the electric vehicle 26 is running.

On the other hand, the plurality of voltage and current control devices 14 receive the current command value and the required voltage value from the ECU 18 via the communication line 22 in step S12 of FIG. Thereby, in step S13, the plurality of voltage and current control devices 14 perform a step-up/down operation on the battery voltage of the connected battery 12 based on the received current command value and required voltage value. As a result, in step S14, the output current is adjusted to the current command value.

If the output voltage is not adjusted to the required voltage value in step S15 (step S15: NO), the plurality of voltage and current control devices 14 repeatedly perform the process of step S14.

FIG. 4 is a timing chart illustrating the relationship between changes over time in the battery voltages of the plurality of batteries 12 (broken line, dashed-dotted line, and dashed-double-dotted line) and the required voltage value (Vreq shown by the solid line). In this case, the battery voltages of the plurality of batteries 12 decrease over time. The plurality of voltage and current control devices 14 perform step-up and step-down operations on the battery voltage so that the output voltage becomes a required voltage value. That is, the output voltage adjustment is repeatedly performed until the output voltages of all voltage and current control devices 14 reach the same required voltage value.

When the output voltage is adjusted to the required voltage value (step S15: YES), the process advances to step S16. In step S16, the plurality of voltage and current control devices 14 determine whether or not the electric vehicle 26 has finished traveling. In this case, for example, it is determined whether or not a notification has been received from the ECU 18 via the communication line 22 that the traveling of the electric vehicle 26 has ended (step S26 in FIG. 3: YES).

If the notification has not been received from the ECU 18, that is, the electric vehicle 26 is running (step S16: NO), the plurality of voltage and current control devices 14 return to step S11 and execute the processes of steps S11 to S16 again. . On the other hand, when receiving a notification from the ECU 18 and determining that the electric vehicle 26 has finished traveling (step S16: YES), the plurality of voltage and current control devices 14 terminate the process of FIG. 2. Therefore, the plurality of voltage and current control devices 14 repeatedly execute the process shown in FIG. 2 while the electric vehicle 26 is running.

[3. Modification of this embodiment]
Next, a modified example (power supply system 30) of the power supply system 10 according to the present embodiment will be described with reference to FIGS. 5 to 10. The power supply system 30 of FIG. 5 differs from the power supply system 10 of FIGS. 1 to 4 in that each of the plurality of batteries 12 is provided with a battery management unit (BMU) 32 that monitors the battery 12. Note that in the power supply system 30 of the modification, the same components as those in the power supply system 10 of FIGS. 1 to 4 are given the same reference numerals, and detailed explanations will be omitted.

The BMU 32 is built into the battery pack together with the battery 12. The BMU 32 determines the SOC, degree of deterioration, and temperature of the battery 12 using a sensor (not shown). Then, the BMU 32 calculates the internal resistance value of the battery 12 using one of the following two calculation methods.

BMU 32 is connected to voltage and current control device 14 via communication line 34 . Therefore, as a first calculation method, the BMU 32 calculates the amount of change in battery voltage over time and The time change in battery current is detected, and the internal resistance value is calculated from the ratio of the time change in battery voltage to the time change in battery current (internal resistance value = (time change in battery voltage) / ( Change in battery current over time)).

Further, the BMU 32 may include a map 36 that shows the relationship between the state of the battery 12 and the internal resistance value of the battery 12. Specifically, as shown in FIGS. 6 to 8, the map 36 has the state of the battery 12 (degree of deterioration (SOH), SOC, or temperature (battery temperature)) on the horizontal axis, and the internal resistance value on the vertical axis. The relationship between the state of the battery 12 and the internal resistance value at that time is stored for each type of battery 12 (solid line, broken line, dashed-dotted line). Therefore, as a second calculation method, the BMU 32 determines the internal resistance value according to the state of the battery 12 by referring to the map 36 after grasping the state of the battery 12 . Note that the map 36 is not an essential component of the BMU 32. Furthermore, the map 36 only needs to include at least one of the maps shown in FIGS. 6 to 8.

The internal resistance value and the state of the battery 12 determined in this way are transmitted to the ECU 18 via the communication line 34, the voltage/current control device 14, and the communication line 22.

The operation of the modified power supply system 30 configured as described above will be described with reference to the flowcharts of FIGS. 9 and 10. Note that, in the operation of the power supply system 30 of the modified example, the description of operations similar to those of the power supply system 10 shown in FIGS. 1 to 4 will be omitted or explained in a simplified manner.

In step S31 of FIG. 9, the driver turns on the main switch of the electric vehicle 26. In this case, for example, the ECU 18 recognizes that the main switch is turned on, and notifies each of the plurality of BMUs 32 of the recognition result via the communication line 22, the plurality of voltage and current control devices 14, and the communication line 34, so that the BMU 32 can know when the main switch is on.

In steps S32 and S33, the BMU 32 calculates the internal resistance value using the first calculation method or the second calculation method described above.

In the case of the first calculation method, the BMU 32 turns on the switching element of the voltage and current control device 14 via the communication line 34 in step S32, and detects the time change in the battery voltage and the time change in the battery current. . Further, the BMU 32 grasps the state of the battery 12 (SOC, degree of deterioration, battery temperature) using a sensor (not shown). Next, in step S33, the BMU 32 calculates the internal resistance value of the battery 12 from the ratio of the time change in battery voltage to the time change in battery current.

On the other hand, in the case of the second calculation method, the BMU 32 grasps the state of the battery 12 in step S32, and refers to any of the maps 36 in FIGS. 6 to 8 in step S33 to determine the state of the battery 12 ( Determine the internal resistance value according to the SOC, degree of deterioration, battery temperature, type).

Thereby, in step S34, the BMU 32 transmits the state and internal resistance value of the battery 12 to the voltage and current control device 14 via the communication line 34. After transmitting to the voltage and current control device 14, the BMU 32 waits to receive a signal or information from the voltage and current control device 14.

As a result, the voltage and current control device 14 acquires the state and internal resistance value of the battery 12 from the BMU 32 in step S11 of FIG. Send to. After the transmission to the ECU 18, the voltage and current control device 14 is in a state of waiting to receive a signal or information from the ECU 18.

The ECU 18 sequentially performs steps S21 and S22 in FIG. However, in step S21, the states and internal resistance values of the plurality of batteries 12 are acquired from the plurality of voltage and current control devices 14.

Then, the ECU 18 executes the process in step S27 in FIG. 10 instead of steps S23 and S24 in FIG. In step S27, the ECU 18 sets a current command value for each of the plurality of voltage and current control devices 14 by proportionally distributing the required current value according to the reciprocal of the internal resistance value of the plurality of batteries 12. Therefore, the current command value for the battery 12 with a high internal resistance value becomes relatively small, while the current command value for the battery 12 with a low internal resistance value becomes relatively large. Note that in step S27, the ECU 18 may correct the plurality of set current command values in consideration of the SOC of the plurality of batteries 12.

After step S27, the ECU 18 proceeds to step S25 in FIG. 3 and outputs the current command value and the required voltage value to the plurality of voltage and current control devices 14 via the communication line 22.

As a result, the plurality of voltage and current control devices 14 execute the processes from step S12 in FIG. 2 onwards. Note that when adjusting the output current to the current command value in step S14, the BMU 32 receives the current command value from the voltage and current control device 14 via the communication line 34 in step S35 of FIG. BMU 32 causes battery current to flow from battery 12 according to the received current command value.

Then, in the next steps S36 and S37, the BMU 32 calculates the internal resistance value using the first calculation method or the second calculation method, similarly to steps S32 and S33.

That is, in the case of the first calculation method, the BMU 32 detects the time change in the battery voltage and the time change in the battery current, and grasps the state of the battery 12 in step S36. In step S37, the BMU 32 calculates the internal resistance value of the battery 12 from the ratio of the time change in battery voltage to the time change in battery current. In the case of the second calculation method, the BMU 32 grasps the state of the battery 12 in step S36, and in step S37 refers to any of the maps 36 in FIGS. 6 to 8 to determine the state of the battery 12. Determine the internal resistance value.

In step S38, the plurality of BMUs 32 determine whether the electric vehicle 26 has finished traveling and the main switch has been turned off. In this case, it is determined whether a notification has been received from the ECU 18 via the communication line 22, the voltage/current control device 14, and the communication line 34 to the effect that the traveling of the electric vehicle 26 has ended (step S26 in FIG. 3: YES).

If the above notification has not been received, that is, if the electric vehicle 26 is running (step S38: NO), the plurality of BMUs 32 return to step S34 and send the voltage and current control device 14 the state and internal resistance value of the battery 12. After transmitting, the processes of steps S35 to S38 are executed again. On the other hand, if the plurality of BMUs 32 receive the above notification and know that the electric vehicle 26 has finished traveling (step S38: YES), the plurality of BMUs 32 terminate the process of FIG. 9 . Therefore, the plurality of BMUs 32 repeatedly execute the processes of steps S34 to S38 in FIG. 9 while the electric vehicle 26 is running.

[4. Effects of this embodiment]
As described above, the power supply systems 10 and 30 according to the present embodiment are power supply systems 10 and 30 that supply the battery voltage and battery current of the plurality of batteries 12 to the motor (load) 28, and are equipped with an ECU (electronic control 18, an input device 20 that inputs an input value (required output value) to the ECU 18, a plurality of voltage and current control devices 14 connected to the plurality of batteries 12, and a plurality of voltage and current control devices 14 on the input side. It has a PDU (output device) 16 that is connected in parallel and has a motor 28 connected to the output side.

The ECU 18 determines a required voltage value and a required current value according to the input value required on the input side of the PDU 16, and controls the voltage and current control devices 14 based on the states and required current values of the multiple batteries 12. Set the current command value for each. The plurality of voltage and current control devices 14 adjust the output voltage output to the input side of the PDU 16 to a required voltage value by increasing and decreasing the battery voltage, and adjust the output current output to the input side of the PDU 16 to a current command value. do.

As a result, the plurality of voltage and current control devices 14 connected to the plurality of batteries 12 increase or decrease the battery voltage based on the required voltage value and current command value set by the ECU 18, thereby increasing the difference from the required voltage value. It is possible to adjust the output voltage so as to fill the gap, and adjust the output current to the current command value. Thereby, even if the plurality of batteries 12 are of different types or in different states, they can be used at the same time.

Furthermore, it is possible to efficiently use the capacity of the plurality of batteries 12, such as by simultaneously using up the capacity of the plurality of batteries 12 or by using up only the capacity of a specific battery 12 first. As a result, it is also possible to replace the battery 12 efficiently.

Further, since the plurality of batteries 12 are removable batteries 12 for the electric vehicle 26 (object) to which the power supply system 10 is applied, the plurality of removable batteries 12 in various states are used at the same time. becomes possible.

Furthermore, conventionally, for example, in an electric vehicle 26 equipped with four removable batteries 12, if the capacity of all the batteries 12 is used on average, the capacity will be the same, so it is necessary to replace all the batteries 12. was there. In contrast, in this embodiment, by controlling the plurality of voltage and current control devices 14 so that the capacity of two batteries 12 is used up first, the capacity of the remaining two batteries 12 is set to 100%. However, it is only necessary to replace the two batteries 12 that have used up their capacity. As a result, since the capacity of all batteries 12 is 100% after replacement, it is possible to reduce the replacement work.

Further, the state of the plurality of batteries 12 is at least one of the SOC, degree of deterioration, temperature, and type of the batteries 12. This makes it possible to efficiently utilize the capacity of a plurality of batteries 12 that have different internal resistance values or voltage drops due to different SOCs, degrees of deterioration, temperatures, or types.

Further, the plurality of voltage and current control devices 14 monitor the states of the batteries 12 connected to their own devices, and output the monitored states of the batteries 12 to the ECU 18, and the ECU 18 receives the input states of the plurality of batteries 12. A current command value for each of the plurality of voltage and current control devices 14 is set based on the current value and the required current value. Thereby, the current command value can be appropriately set according to the state of each battery 12, so that the capacity of each battery 12 can be used more efficiently.

Further, the required current value is the sum of output currents flowing from the plurality of voltage and current control devices 14 to the input side of the PDU 16 according to the input value, and the ECU 18 calculates the required current value by taking into consideration the states of the plurality of batteries 12. By distributing this, a current command value for each of the plurality of voltage and current control devices 14 is set. Thereby, the current command value is appropriately set according to the states of the plurality of batteries 12, so that the capacity of each battery 12 can be used more efficiently.

Specifically, the power supply system 30 further includes a BMU (battery management unit) 32 that is installed alongside the plurality of batteries 12 and monitors the installed batteries 12. The plurality of BMUs 32 calculate the internal resistance value of the battery 12 installed in parallel, and output the calculated internal resistance value to the ECU 18. The ECU 18 sets a current command value for each of the plurality of voltage and current control devices 14 by proportionally distributing the required current value according to the plurality of input internal resistance values. Thereby, current command values for the plurality of voltage and current control devices 14 can be set simply and efficiently.

In this case, the plurality of BMUs 32 detect the SOC of the battery 12 installed in parallel, and output the detected SOC to the ECU 18, and the ECU 18 takes into account the plurality of input SOCs and sets the plurality of current command values. It may be corrected. Thereby, the current command value can be set so that more battery current flows for the battery 12 with a large SOC.

Alternatively, the plurality of BMUs 32 are provided with a map 36 that shows the relationship between the internal resistance value of the battery 12 installed in parallel and the degree of deterioration, SOC, or temperature of the battery 12, and at least when the power supply system 30 starts up, What is necessary is to detect the degree of deterioration, SOC, or temperature, and refer to the map 36 to specify the internal resistance value according to the detected degree of deterioration, SOC, or temperature. Thereby, the internal resistance value can be calculated simply and easily, and the current command value can be set.

It goes without saying that the present invention is not limited to the above-described embodiments, and can take various configurations based on the contents of this specification.

Claims (3)

A power supply system that supplies battery voltage and battery current of a plurality of batteries to a load, the power supply system comprising:
a control device, an input device for inputting a required output value to the control device, a plurality of voltage and current control devices connected to the plurality of batteries, and a plurality of the voltage and current control devices connected in parallel to the input side, It has an output device to which the load is connected to the output side, and a battery management unit that is installed alongside the plurality of batteries and monitors the batteries that are installed together,
The plurality of battery management units detect the SOC of the batteries installed in parallel , calculate the internal resistance value of the battery , and output the detected SOC and the calculated internal resistance value to the control device,
The control device determines a necessary voltage value and a necessary current value according to the required output value required on the input side of the output device, and determines the necessary voltage value and necessary current value according to the input internal resistance values of the plurality of batteries. By proportionally distributing the required current value, a current command value for each of the plurality of voltage and current control devices is set, and the plurality of set current command values are corrected in consideration of the plurality of inputted SOCs. ,
The required current value is the sum of output currents flowing from the plurality of voltage and current control devices to the input side of the output device according to the required output value,
The plurality of voltage and current control devices adjust the output voltage output to the input side of the output device to the required voltage value by increasing and decreasing the battery voltage, and the output voltage output to the input side of the output device . A power supply system that adjusts current to the current command value. The power supply system according to claim 1,
A power supply system, wherein the plurality of batteries are batteries that are detachable from an object to which the power supply system is applied. The power supply system according to claim 1 or 2 ,
The plurality of battery management units are provided with a map showing the relationship between the internal resistance value of the batteries installed in parallel, the degree of deterioration of the battery, SOC, or temperature, and at least when the power supply system is started, the battery management units are configured to detect the deterioration of the battery. The power supply system detects the degree of deterioration, the SOC, or the temperature, and specifies the internal resistance value according to the detected degree of deterioration, the SOC, or the temperature by referring to the map.

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