JP3778821B2 - Power supply for automobile - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a power supply device for an automobile including an assembled battery formed by connecting a plurality of divided units in series.
[0002]
[Prior art]
Nickel metal hydride batteries are excellent in basic characteristics such as energy density, power density, and cycle characteristics, and are being developed for practical use as power sources for electric vehicles and the like. When used for an electric vehicle, a battery capacity capable of flowing a current of about 50 to 200 A and an output voltage of about 100 to 350 V are required to obtain a predetermined output. Since the nickel hydride battery has an output voltage of about 1.2 V per cell, a large number of cells are connected in series to obtain a required output voltage. For example, by connecting 6 cells in series to form one module, and further connecting 32 modules in series, a power supply device including a battery pack of 192 cells is configured, and an output voltage of about 230 V is obtained.
[0003]
In such a power supply device, it is necessary to monitor the state of the battery in order to always obtain a stable output. In monitoring the battery state, it is easy in terms of construction to detect the output voltage and / or battery temperature of the entire assembled battery.
[0004]
[Problems to be solved by the invention]
In this configuration, even if one of the modules and cells constituting the assembled battery is in an abnormal state, it is difficult to find the presence of the abnormality. Japanese Patent Application Laid-Open No. 11-165540 describes a configuration in which a voltage sensor for detecting a battery voltage is provided for each battery module. In this configuration, the state of each module can be detected individually.
[0005]
However, in the prior art, what is provided for each module is a sensor that simply detects the voltage of the module, and various calculations based on the output of each sensor are performed intensively by the battery ECU. Therefore, there are many problems such as a heavy load on the battery ECU.
[0006]
Furthermore, since one battery ECU detects the state of all the battery modules, it is difficult to accurately detect each battery module independently. Also, if the remaining capacity is calculated independently while taking into account the voltage of each battery module, the load on the battery ECU will increase more and more. Furthermore, the power supply device that detects the voltage of each battery module with the voltage sensor needs to connect the lead wire of each voltage sensor to the battery ECU. Since the voltage sensor is connected to each battery module, it has a high potential. For this reason, when a power supply device is damaged by an accident etc., there exists a fault to which a heavy current flows into a high voltage lead wire.
[0007]
The present invention has been developed for the purpose of solving such drawbacks. An important object of the present invention is to provide a power supply device for an automobile capable of detecting in more detail the state of a divided unit composed of each battery module while reducing the load on the battery ECU and using an inexpensive one. Is to provide.
[0008]
Another important object of the present invention is that it can extend the life of the battery module, improve safety and reliability at the time of collision, further reduce the error due to noise, and more accurately configure the battery module. An object of the present invention is to provide a power supply device for an automobile that can detect the state of a divided unit.
[0009]
[Means for Solving the Problems]
The power supply device for an automobile of the present invention includes an assembled battery in which a plurality of divided units are connected in series, a plurality of battery state detection circuits 9 connected to each divided unit constituting the assembled battery, A battery ECU 8 connected to each battery state detection circuit 9 via an external communication bus 10 is provided. Each battery state detection circuit 9 includes a voltage detector that detects the battery voltage of the dividing unit, an A / D converter that converts the output of the voltage detector into a digital signal, and a voltage detected by the voltage detector. And a communication circuit for transmitting the state of the divided unit detected by the unit calculation circuit to the battery ECU 8 via the external communication bus 10. The battery state detection circuit 9 detects the state of each divided unit by the unit arithmetic circuit, and transmits the detected state of the divided unit to the battery ECU 8 via the external communication bus 10.
[0010]
  Furthermore, the present inventionPower ofThe source device includes an assembled battery in which a plurality of divided units are connected in series, a plurality of battery state detection circuits 9 connected to each divided unit constituting the assembled battery, and a current flowing through the assembled battery. A battery current detection circuit 11 for detection and a battery ECU 8 connected to each battery state detection circuit 9 via an external communication bus 10 are provided. Each battery state detection circuit 9 includes a voltage detector that detects the battery voltage of the divided unit, an A / D converter that converts the output of the voltage detector into a digital signal, a voltage detected by the voltage detector, and a battery. A unit arithmetic circuit that calculates the remaining capacity of the divided unit from the current detected by the current detection circuit 11 and a communication circuit that transmits the remaining capacity calculated by the unit arithmetic circuit to the battery ECU 8 via the external communication bus 10 are provided. The battery state detection circuit 9 calculates the remaining capacity of each divided unit by the unit calculation circuit, and transmits the calculated remaining capacity to the battery ECU 8 via the external communication bus 10.
[0012]
The battery current detection circuit 11 preferably includes an A / D converter that converts the detected battery current into a digital signal, and the battery current of the digital signal converted by the A / D converter is transmitted via the external communication bus 10. This is transmitted to the battery state detection circuit 9. The battery current detection circuit 11 can also detect the battery current and convert it into a voltage signal of an analog signal, and transmit the current signal as an analog signal to each battery state detection circuit 9. The battery state detection circuit 9 can convert an analog current signal into a digital signal by an A / D converter that converts the battery voltage into a digital signal. Further, the battery state detection circuit 9 may include a dedicated A / D converter that converts a current signal that is an analog signal into an A / D converter.
[0014]
  Furthermore, the power supply device of the present invention houses a plurality of battery modules 1 in a battery case 4 and is an end that fixes a bus bar 6 that is a part of the battery case 4 and connects the battery modules 1 in series. On plate 5Battery module (1) Without using the storage spaceThe battery state detection circuit 9 can be fixed. The battery current detection circuit 11 can measure the current by detecting the voltage of the bus bar 6 connecting the battery modules 1 in series. Further, the power supply device can accommodate the battery case 4 in the case 3 and be disposed in the battery ECU 8 inside the case 3 and outside the battery case 4..
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. However, the embodiments described below exemplify a power supply device for embodying the technical idea of the present invention, and the present invention does not specify the power supply device as follows.
[0016]
Further, in this specification, in order to facilitate understanding of the scope of claims, the numbers corresponding to the members shown in the examples are referred to as “the scope of claims” and “the means for solving the problems”. It is added to the member shown by. However, the members shown in the claims are not limited to the members in the embodiments.
[0017]
FIG. 1 shows a power supply apparatus according to an embodiment of the present invention used in an electric vehicle or the like, and a circuit diagram of the power supply apparatus is shown in FIG. The power supply device of FIG. 1 has a battery for driving a motor that drives an automobile built in a case 3. The case 3 has a battery storage portion 3A for storing a battery, and an impact absorbing portion 3B disposed adjacent to the battery storage portion 3A. The shock absorber 3B destroys itself and absorbs the shock. The shock absorbing part 3B that destroys itself and sucks the shock is manufactured so that the breaking strength is weaker than that of the battery housing part 3A.
[0018]
The battery storage unit 3A stores a battery case 4 and a battery ECU 8 that store a plurality of batteries. The power supply device of FIG. 1 stores two battery cases 4 in a battery storage portion 3A. As shown in this figure, the battery storage portion 3A can store a plurality of battery cases 4. The structure in which the plurality of battery cases 4 are accommodated in the battery accommodating portion 3A can make the battery case 4 light and small, so that the operation for accommodating the battery accommodating portion 3A can be efficiently performed. Furthermore, the battery case 4 provided with handles on both sides can be more efficiently inserted into and removed from the battery storage portion 3A.
[0019]
The power supply apparatus of this invention comprises an assembled battery by the some division | segmentation unit connected in series. The dividing unit is composed of one or a plurality of battery modules 1. As shown in FIG. 3, the battery case 4 houses a plurality of battery modules 1 constituting the divided unit, arranged in parallel so that a gap is formed. The battery module 1 has a plurality of unit cells 2 connected in series in a straight line. The plurality of battery modules 1 housed in the battery case 4 are connected to each other in series by a metal plate bus bar 6 to increase the output voltage. The bus bar 6 is attached to the end plate 5 of the battery case 4. Further, the outputs of the plurality of battery cases 4 stored in the battery storage unit 3A are also connected in series. Accordingly, all the unit cells 2 housed in the battery housing portion 3A are connected in series to increase the output voltage. The output voltage of the power supply device is adjusted by the number of unit cells 2, in other words, the number of battery modules 1. The output voltage of the power supply device is set to an optimum voltage according to the output required for the automobile, and is set to a range of 100 to 300 V, for example. The unit cell 2 is a 5 to 7 Ah nickel-hydrogen battery. However, the capacity of the unit cell 2 is not specified to this value and can be made larger or smaller than this value. The unit cell 2 can be any secondary battery such as a lithium ion battery or a nickel-cadmium battery.
[0020]
In the battery module 1, for example, 5 to 10 unit cells 2 are linearly connected in series. In the battery module 1, a cylindrical unit cell 2 is linearly connected via a dish-like connecting body 7 made of a metal plate. However, the battery module can also be manufactured by connecting square unit cells in series. At both ends of the battery module 1, an electrode terminal (not shown) composed of a positive electrode terminal and a negative electrode terminal is connected. This electrode terminal is connected by the bus bar 6, and all the battery modules 1 are connected in series.
[0021]
The unit cells connected in series can be connected by welding the opposing surfaces of the U-curved lead plates without using a dish-like connection body. In this battery module, a large current is pulsed in the direction in which the unit cell is discharged, and the opposing surfaces of the U-curved lead plate are welded. Further, the battery module performs a large current pulse energization process in the direction of discharging the unit cell in a state where the metal plate is sandwiched between the positive and negative electrodes of the unit cell, and welds the metal plate to the unit cell electrode. You can also
[0022]
Furthermore, the positive and negative electrodes of the unit cell can be directly welded without sandwiching the metal plate between the unit cells. In this unit cell, a conical protrusion is provided on the upper surface of the sealing plate which is a positive electrode terminal, and this protrusion is welded by applying a large current pulse to the negative electrode terminal of the adjacent unit cell.
[0023]
As shown in FIG. 3, the battery case 4 has a battery state detection circuit 9 attached to the end plate 5. The end plate 5 is located at both ends of the battery module 1. The end plate 5 is equipped with a bus bar 6 that connects the battery modules 1 in series. The bus bar 6 is fixed to the positive electrode terminal and the negative electrode terminal of the adjacent battery module 1 by screwing ends, and connects the adjacent battery modules 1 in series. The end plate 5 is mounted with a battery state detection circuit 9 together with the bus bar 6.
[0024]
In the power supply apparatus, a plurality of divided units connected in series form an assembled battery, and one divided unit includes one battery module 1 or a plurality of battery modules 1. A power supply device that uses one battery module 1 as one divided unit can detect the state of each battery module 1 most accurately. This is because the battery state detection circuit 9 detects the state of one battery module 1 as one divided unit. One divided unit can be composed of two battery modules 1. This power supply device can detect the voltages of all the divided units by attaching the battery state detection circuit 9 to the end plate 5 on one side of the battery case 4. This is because the voltage between the adjacent bus bars 6 becomes the voltage of the two battery modules 1. However, the voltage of all the divided units can also be detected by the battery state detection circuit that is constituted by one battery module and is mounted on one end plate. In this power supply device, a lead wire for detecting a voltage is extended to an end plate on the side opposite to that provided with a battery state detection circuit and connected to a bus bar. Further, the division unit can be constituted by a series of three or more battery modules. However, the more the battery module is configured in one divided unit, the more difficult it is to accurately detect the state of each battery module. Therefore, the division unit constituted by a plurality of battery modules preferably constitutes one division unit by 2 to 4 battery modules.
[0025]
The battery state detection circuit 9 includes a voltage detector that detects the battery voltage of the divided unit, a temperature detector that detects the temperature of the battery module 1 that constitutes the divided unit, and a digital signal that outputs the voltage detector and the temperature detector. A / D converter that converts the output of the voltage detector and the temperature detector into a digital signal, a unit arithmetic circuit that detects the state of the divided unit from the signal converted into a digital signal, and the state of the divided unit detected by the unit arithmetic circuit Is transmitted to the battery ECU 8 via the external communication bus 10.
[0026]
Each unit arithmetic circuit detects a state of each divided unit, for example, a remaining capacity or an abnormal state of the divided unit, based on a signal input from the A / D converter. The detected state of each divided unit is transmitted to the battery ECU 8 via the external communication bus 10. The unit arithmetic circuit determines that the abnormal state is present, for example, when the voltage deviation of each divided unit is a predetermined value (for example, 1 V) or more, or when the battery temperature deviation is a predetermined value (for example, 10 ° C.) or more. Further, the unit arithmetic circuit can also determine that the divided unit is in an abnormal state when the voltage value of the divided unit is higher than the highest voltage or lower than the lowest voltage, and when the temperature of the divided unit is higher than the set value. .
[0027]
The power supply device of FIG. 2 includes a battery current detection circuit 11 that detects the current of the assembled battery. The battery current detection circuit 11 includes an A / D converter that detects the current flowing through the assembled battery by measuring the voltage across the shunt resistor and converts it into a digital signal as shown in FIG. Instead of the shunt resistor, an element capable of measuring a current value such as a Hall element may be used. The battery current of the digital signal converted by the A / D converter is transmitted to the battery state detection circuit 9 via the external communication bus 10. This power supply device uses a unit arithmetic circuit of the battery state detection circuit 9 to convert a digital signal input from the battery current detection circuit 11 and a signal of the voltage detector and the temperature detector into a digital signal by an A / D converter. The remaining capacity of the division unit is calculated from the obtained signal. The remaining capacity is calculated by integrating the charge / discharge current flowing in the battery. Since all the battery modules 1 are connected in series in the power supply device, the same current flows through all the battery modules 1. Therefore, it is not necessary to detect the current in each battery module 1, and one detection value can be used for calculation of the remaining capacity of all the battery modules 1.
[0028]
The remaining capacity is calculated by subtracting the discharge capacity from the charge capacity. The charge capacity is calculated by the product of the integrated value of the charge current and the charge efficiency, and the discharge capacity is calculated by the product of the integrated value of the discharge current and the discharge efficiency. All battery modules 1 are connected in series and the same current flows, but the remaining capacity of each battery module 1 does not necessarily match. In particular, the relative remaining capacity that displays the remaining capacity in% fluctuates as it deteriorates. This is because the maximum charge capacity changes and the relative remaining capacity changes. The relative remaining capacity is calculated by the ratio of remaining capacity / maximum charging capacity. Therefore, if the maximum charge capacity of any one of the divided units is reduced by half compared to the other, the calculated relative remaining capacity is doubled.
[0029]
Further, when a divided unit having a relative remaining capacity exceeding 100% is charged, the divided unit is overcharged and the unit cell 2 is significantly deteriorated. Further, even if the divided unit having a relative remaining capacity of 0% is discharged, the unit cell 2 is over-discharged to be significantly deteriorated. In order to minimize the degradation of the unit cell 2, all the divided units must be prevented from being overcharged and overdischarged. The battery ECU 8 is preferably charged and discharged within a range of 20 to 80%, more preferably 30 to 70% so that the relative remaining capacity of the divided units does not exceed the range of 0 to 100%. However, the battery ECU 8 discharges until the remaining capacity becomes zero or is fully charged only when necessary to correct the remaining capacity of the divided unit or when necessary to eliminate the memory effect of the battery. Charge until
[0030]
When the divided unit is completely discharged, the battery voltage drops to the set voltage. Therefore, when the voltage of the divided unit is reduced to the set voltage, the unit arithmetic circuit corrects the remaining capacity calculated from the integrated value of the charge / discharge current to a completely discharged state. When the divided unit is fully charged, the battery voltage increases to the set voltage, or the peak voltage decreases by -ΔV. A battery module in which a unit cell is a lithium ion battery detects that the battery voltage has increased to a set voltage and determines that the battery is fully charged. A battery module in which the unit cell is a nickel-hydrogen battery or a nickel-cadmium battery detects that the battery voltage is reduced by -ΔV from the peak voltage and determines that the battery is fully charged. When the battery is fully charged, the relative remaining capacity is corrected to 100%, or the remaining capacity (Ah) calculated at that time is corrected to the maximum charging capacity. As described above, when the remaining capacity of the battery is detected to be 0 or 100% and the remaining capacity is corrected, the remaining capacity can be corrected extremely accurately.
[0031]
However, the remaining capacity can be corrected when the remaining capacity of the divided unit is 20% or 80%. This is because, when the remaining capacity is 20% or less, or 80% or more, the voltage of the divided unit has a characteristic of rapidly changing (decreasing or increasing). The unit arithmetic circuit for realizing this stores the correlation between the remaining capacity and the battery voltage, and corrects the remaining capacity accurately from the battery voltage when the remaining capacity becomes a predetermined value.
[0032]
Furthermore, the unit arithmetic circuit of each battery state detection circuit 9 can also correct the remaining capacity by correcting the maximum charge capacity from the number of charge / discharge cycles, the total value of charge / discharge current, or the use state of the power supply device. . This power supply device has a feature that the calculated remaining capacity can be corrected without charging or discharging the remaining capacity until it reaches a predetermined capacity. The remaining capacity calculated by the unit arithmetic circuit of the power supply device is transmitted from the external communication bus 10 to the battery ECU 8 as a relative remaining capacity or a capacity represented by Ah. The unit calculation circuit that calculates the capacity represented by Ah instead of the relative remaining capacity transmits the maximum charge capacity together with the remaining capacity from the external communication bus 10 to the battery ECU 8. This is to prevent the battery ECU 8 from charging the divided unit beyond the maximum charging capacity.
[0033]
The A / D converter of the battery current detection circuit 11 and the A / D converter of the battery state detection circuit 9 are controlled at a constant sampling period or by a signal input from the battery ECU 8, and the current and voltage are digitalized. Convert to signal. A current signal which is a digital signal A / D converted by the A / D converter of the battery current detection circuit 11 is transmitted to the unit arithmetic circuit of each battery state detection circuit 9 via the external communication bus 10.
[0034]
The battery current detection circuit 11 detects a voltage drop of the bus bar 6 connecting the battery modules 1 in series to detect a current. The voltage drop of the bus bar 6 is the product of the current flowing through the battery and the resistance value of the bus bar 6, and the polarity of the voltage drop is reversed between the charging current and the discharging current. Since the resistance value of the bus bar 6 is extremely small, the voltage drop of the bus bar 6 with respect to the current is small. Therefore, the voltage of the bus bar 6 is amplified by the amplifier and converted into a digital signal by the A / D converter.
[0035]
Since the battery state detection circuit 9 includes an A / D converter, the analog signal of the battery current detection circuit 11 can be converted into a digital signal by the A / D converter. The power supply device transmits a current signal, which is an analog signal, from the battery current detection circuit 11 to each battery state detection circuit 9. Each battery state detection circuit 9 converts the current signal into a digital signal and calculates the remaining capacity of the division unit. In this power supply device, it is not necessary to provide an A / D converter in the battery current detection circuit 11, and the battery current detection circuit 11 can be made simple and inexpensive. Further, the A / D converter built in the battery state detection circuit 9 can convert an analog signal input from both the voltage detector and the temperature detector into a digital signal. The battery state detection circuit 9 includes one A / D converter. However, the battery state detection circuit 9 can also convert the analog signals of the voltage detector and the temperature detector into digital signals separately by a dedicated A / D converter.
[0036]
Each unit state calculation circuit built in each battery state detection circuit 9 independently calculates the remaining capacity of the divided unit, and a signal requesting output of the remaining capacity from the battery ECU 8 is input from the external communication bus 10. Then, a digital signal indicating the remaining capacity is output to the battery ECU 8. Alternatively, the unit arithmetic circuit can output the calculated remaining capacity to the battery ECU 8 at a constant cycle. The battery state detection circuit 9 converts the battery voltage detected at a constant sampling period into a digital signal and calculates the current signal input from the battery current detection circuit 11 to accurately calculate the remaining capacity. Since this power supply device does not need to calculate the remaining capacity by the battery ECU 8, the remaining capacity of each divided unit can be accurately detected while making the load on the battery ECU 8 lightest. The battery ECU 8 transmits the determination result of the remaining capacity and the battery state to the vehicle-side controller 12.
[0037]
The above power supply device can transmit the remaining capacity of the divided unit to the battery ECU 8 in the following flowchart.
[Step S1]
The battery ECU 8 transmits an ID signal indicating the detection circuit to the battery state detection circuit 9 from the external communication bus 10.
[Step S2]
The battery state detection circuit 9 corresponding to the ID signal transmits to the battery ECU 8 as a digital signal over the external communication bus 10 whether the remaining capacity of the divided unit is abnormal.
Thereafter, the battery ECU 8 sequentially transmits ID signals to the battery state detection circuits 9A,..., 9X in the same manner, and receives digital signals such as the remaining capacity from these battery state detection circuits 9.
[0038]
The battery ECU 8 to which the remaining capacity is transmitted from each divided unit controls charging / discharging so that the remaining capacity of each divided unit is performed within a range of 20% to 80% of the maximum charging capacity.
[0039]
The digital signal communication performed via the external communication bus 10 can be repeated 3 to 4 times to prevent an erroneous signal from being transmitted due to noise or the like. The battery state detection circuit 9 sequentially transmits a digital signal indicating whether the divided unit is abnormal and a digital signal of the remaining capacity to the battery ECU 8, and the battery ECU 8 transmits the result to the vehicle-side controller 12. Thereafter, this operation is repeated.
[0040]
【The invention's effect】
The power supply device for automobiles of the present invention has the feature that the state of the divided unit composed of each battery module can be detected independently and in more detail while reducing the load on the battery ECU and using an inexpensive one. . In the power supply device of the present invention, a battery state detection circuit is connected to each of a plurality of divided units, and this battery state detection circuit detects the state of each divided unit, and the detected state of the divided unit is externally indicated. This is because the data is transmitted to the battery ECU via the communication bus. As described above, the power supply apparatus in which the plurality of battery state detection circuits independently detect the state of each divided unit can detect the state of each divided unit in more detail and can reduce the load on the battery ECU and can be inexpensive. There is a feature that can use things.
[0041]
In particular, since the battery state detection circuit connected to each divided unit detects the voltage of each divided unit and detects the state of each divided unit, this power supply apparatus is distributed to each divided unit as in the prior art. There is no need to connect the lead wire of the installed voltage sensor to the battery ECU. Thus, the power supply device of the present invention that does not require complicated wiring can improve safety and reliability in the event of a collision, and can reduce the error due to noise, and more accurately the divided unit composed of battery modules. There is also a feature that can detect the state.
[0042]
Furthermore, since the power supply apparatus of the present invention is provided with a battery state detection circuit having the same configuration for each divided unit, a versatile system can be configured regardless of the increase or decrease in the number of divided units. In addition, since the battery state detection circuit can be disposed close to the divided unit, various wirings can be shortened to improve detection accuracy, and assemblability can be improved. Furthermore, the safety and reliability of the signal line can be improved by transmitting the signal from the battery state detection circuit as a digital signal.
[0043]
  Furthermore, the present inventionPower ofSince the source device includes a battery current detection circuit that detects a current flowing through the assembled battery, the voltage detected by each battery state detection circuit and the current detected by the battery current detection circuit The remaining capacity can be calculated accurately. For this reason, this power supply device has the feature that the remaining capacity is controlled to an ideal state for each divided unit, the deterioration of the battery module constituting each divided unit is effectively prevented, and the life of the battery module can be extended.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the internal structure of a power supply device for an automobile according to an embodiment of the present invention.
FIG. 2 is a circuit diagram of an automobile power supply device according to an embodiment of the present invention.
FIG. 3 is a schematic perspective view showing a state in which a plurality of battery modules are housed in a battery case.
[Explanation of symbols]
1 ... Battery module
2 ... Unit cell
3 ... Case 3A ... Battery storage part 3B ... Shock absorbing part
4 ... Battery case
5 ... End plate
6 ... Bus bar
7 ... Dish-shaped connector
8 ... Battery ECU
9 ... Battery state detection circuit
10 ... External communication bus
11 ... Battery current detection circuit
12 ... Car controller

Claims (8)

An assembled battery in which a plurality of divided units are connected in series, a plurality of battery state detection circuits (9) connected to each divided unit constituting the assembled battery, and a current flowing through the assembled battery are detected. A battery current detection circuit (11) and a battery ECU (8) connected to each battery state detection circuit (9) via an external communication bus (10),
Each of the battery state detection circuits (9) is detected by a voltage detector that detects the battery voltage of the divided unit, an A / D converter that converts the output of the voltage detector into a digital signal, and a voltage detector. Unit calculation circuit that calculates the remaining capacity of the split unit from the detected voltage and the current detected by the battery current detection circuit (11), and the remaining capacity calculated by the unit calculation circuit via the external communication bus (10) A communication circuit is provided for transmission to the ECU (8), the remaining capacity of each divided unit is calculated by the unit calculation circuit of the battery state detection circuit (9), and the calculated remaining capacity is calculated via the external communication bus (10). To the battery ECU (8),
The battery current detection circuit (11) includes an A / D converter that converts the detected battery current into a digital signal, and the battery current of the digital signal converted by the A / D converter is transmitted via the external communication bus (10). A power supply for automobiles that transmits to the battery state detection circuit (9). An assembled battery in which a plurality of divided units are connected in series, a plurality of battery state detection circuits (9) connected to each divided unit constituting the assembled battery, and a current flowing through the assembled battery are detected. A battery current detection circuit (11) and a battery ECU (8) connected to each battery state detection circuit (9) via an external communication bus (10),
Each of the battery state detection circuits (9) is detected by a voltage detector that detects the battery voltage of the divided unit, an A / D converter that converts the output of the voltage detector into a digital signal, and a voltage detector. Unit calculation circuit that calculates the remaining capacity of the split unit from the detected voltage and the current detected by the battery current detection circuit (11), and the remaining capacity calculated by the unit calculation circuit via the external communication bus (10) A communication circuit is provided for transmission to the ECU (8), the remaining capacity of each divided unit is calculated by the unit calculation circuit of the battery state detection circuit (9), and the calculated remaining capacity is calculated via the external communication bus (10). To the battery ECU (8),
A power supply device for an automobile in which a battery current detection circuit (11) detects a battery current, converts it into a voltage signal of an analog signal, and transmits the current signal as an analog signal to each battery state detection circuit (9).   3. The vehicle-use vehicle according to claim 2, wherein an A / D converter for converting a battery voltage into a digital signal, which is provided in the battery state detection circuit (9), converts an analog current signal into a digital signal. Power supply.   The power supply device for an automobile according to claim 2, wherein the battery state detection circuit (9) includes a dedicated A / D converter for converting a current signal which is an analog signal into an A / D converter. An assembled battery in which a plurality of divided units are connected in series, a plurality of battery state detection circuits (9) connected to each of the divided units constituting the assembled battery, and each battery state detection circuit (9 Battery ECU (8) connected via an external communication bus (10) to
Each of the battery state detection circuits (9) is detected by a voltage detector that detects the battery voltage of the divided unit, an A / D converter that converts the output of the voltage detector into a digital signal, and a voltage detector. A unit arithmetic circuit for detecting the state of the divided unit from the measured voltage, and a communication circuit for transmitting the state of the divided unit detected by the unit arithmetic circuit to the battery ECU (8) via the external communication bus (10). The unit operation circuit of the state detection circuit (9) detects the state of each divided unit, and transmits the detected state of the divided unit to the battery ECU (8) via the external communication bus (10).
A power supply device for an automobile in which a battery case (4) is housed in a case (3), and a battery ECU (8) is disposed outside the battery case (4) inside the case (3). An assembled battery in which a plurality of divided units are connected in series, a plurality of battery state detection circuits (9) connected to each divided unit constituting the assembled battery, and a current flowing through the assembled battery are detected. A battery current detection circuit (11) and a battery ECU (8) connected to each battery state detection circuit (9) via an external communication bus (10),
Each of the battery state detection circuits (9) is detected by a voltage detector that detects the battery voltage of the divided unit, an A / D converter that converts the output of the voltage detector into a digital signal, and a voltage detector. Unit calculation circuit that calculates the remaining capacity of the split unit from the detected voltage and the current detected by the battery current detection circuit (11), and the remaining capacity calculated by the unit calculation circuit via the external communication bus (10) A communication circuit is provided for transmission to the ECU (8), the remaining capacity of each divided unit is calculated by the unit calculation circuit of the battery state detection circuit (9), and the calculated remaining capacity is calculated via the external communication bus (10). To the battery ECU (8),
A power supply device for an automobile in which a battery case (4) is housed in a case (3), and a battery ECU (8) is disposed outside the battery case (4) inside the case (3). An assembled battery in which a plurality of divided units are connected in series, a plurality of battery state detection circuits (9) connected to each of the divided units constituting the assembled battery, and each battery state detection circuit (9 Battery ECU (8) connected via an external communication bus (10) to
Each of the battery state detection circuits (9) is detected by a voltage detector that detects the battery voltage of the divided unit, an A / D converter that converts the output of the voltage detector into a digital signal, and a voltage detector. A unit arithmetic circuit for detecting the state of the divided unit from the measured voltage, and a communication circuit for transmitting the state of the divided unit detected by the unit arithmetic circuit to the battery ECU (8) via the external communication bus (10). The unit operation circuit of the state detection circuit (9) detects the state of each divided unit, and transmits the detected state of the divided unit to the battery ECU (8) via the external communication bus (10).
A plurality of battery modules (1) are stored in a battery case (4), and a bus bar (6) that is a part of the battery case (4) and connects the battery modules (1) in series is fixed. A vehicle power supply device in which the battery state detection circuit (9) is fixed to the end plate (5) without using the storage space for the battery module (1) . An assembled battery in which a plurality of divided units are connected in series, a plurality of battery state detection circuits (9) connected to each divided unit constituting the assembled battery, and a current flowing through the assembled battery are detected. A battery current detection circuit (11) and a battery ECU (8) connected to each battery state detection circuit (9) via an external communication bus (10),
Each of the battery state detection circuits (9) is detected by a voltage detector that detects the battery voltage of the divided unit, an A / D converter that converts the output of the voltage detector into a digital signal, and a voltage detector. Unit calculation circuit that calculates the remaining capacity of the split unit from the detected voltage and the current detected by the battery current detection circuit (11), and the remaining capacity calculated by the unit calculation circuit via the external communication bus (10) A communication circuit is provided for transmission to the ECU (8), the remaining capacity of each divided unit is calculated by the unit calculation circuit of the battery state detection circuit (9), and the calculated remaining capacity is calculated via the external communication bus (10). To the battery ECU (8),
A plurality of battery modules (1) are stored in a battery case (4), and a bus bar (6) that is a part of the battery case (4) and connects the battery modules (1) in series is fixed. A vehicle power supply device in which the battery state detection circuit (9) is fixed to the end plate (5) without using the storage space for the battery module (1) .

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