JPH08162171A - Monitoring device for set battery - Google Patents

Abstract

PURPOSE: To solve the complication of a wiring by detecting the voltage of each module battery of a set battery connected in series, converting it into a digital signal followed by serial transmission and outputting. CONSTITUTION: The voltage between respective terminals of modules 101-124 is detected by a voltage detecting circuit 20, converted into a digital signal by a signal converting and transmitting circuit 21, and transmitted to an ECU 3 through serial transmission lines 4a, 4b. The circuit 21 contains a CPU, and also transmits various data stored in a ROM 23 to the ECU 3. Voltmeter units 201-224 are mounted on the respective side surfaces of the modules 101-124. The input terminals of each unit 201-224 are connected to both (+) and (-) terminals of the corresponding module to receive each voltage of the module. It is only the unit 201 to be connected through the transmission line 4a that is directly connected to the ECU 3, and the mutual connection of the units 202-224 is performed by only the transmission line 4b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called assembled battery which is a storage battery mounted as a power source for driving a moving body such as an electric vehicle and which is composed of an assembly of a plurality of unit storage batteries. The present invention relates to a device for monitoring and holding various information about a battery.

[0002]

2. Description of the Related Art Lead-acid batteries, nickel-hydrogen storage batteries and the like used as power sources for drive motors in moving bodies such as electric vehicles and motor-driven industrial vehicles are generally
A plurality of unit batteries are connected in series to obtain a total voltage required for exhibiting a predetermined power performance. For example, a sealed nickel-hydrogen storage battery, which has excellent basic characteristics such as energy density, output density, and cycle life, has been drawing attention in recent years as a power source for a drive motor for electric vehicles, etc. I'm out. When the battery is used as a power source for an electric vehicle, in order to obtain a predetermined drive output, the battery capacity is 50 to 120 Ah and 100 to 100 Ah.
A total voltage of about 350V is required. The output voltage of a nickel-hydrogen battery is 1.2, which is the minimum unit for practical use.
Since it is about V, many cells are connected in series to obtain a required total voltage. FIG. 10 is mounted on an electric vehicle,
It is an internal circuit diagram of the storage battery which consists of an assembly of a sealed nickel-hydrogen storage battery. The battery 1 includes a plurality of (for example, 24) modules 101, 102, 103 ,. ． ． ,
And 124 in series connection (hereinafter referred to as assembled battery 1), and each module further includes a plurality (usually 10
Cell) connected in series. In this way, an assembled battery of 240 cells is obtained with a total voltage of 28
8V is obtained.

In such an electric vehicle using a battery as a power source, the vehicle voltage is monitored by monitoring the battery voltage in the same manner as an automobile using an internal combustion engine as a power source always monitors the remaining amount of fuel. It is necessary to know the amount. FIG. 11 is a diagram showing a schematic configuration of a conventional assembled battery 1. In the figure, the battery pack 1 has 24 modules 101 to 124 arranged vertically 6
One piece and four pieces are arranged side by side and housed in the container 131. The voltage between the + and-terminals of each of the modules 101 to 124 is sent to the monitoring device 2 provided near the assembled battery 1 via the lead wire 132 (the lead wire 132 is the module 101, 1).
Only 02 and 124 are shown), and further sent from the monitoring device 2 to the electronic control unit (ECU) 3 which is the center (central control device) of monitoring and control.

[0004]

According to the conventional monitoring device as described above, since all the modules 101 to 124 are connected to the monitoring device 2 by the lead wires 132, a total of 48 lead wires 132 are assembled. Wired to crawl on top of the battery. Therefore, there is a problem that the wiring work takes time and the reliability of the connection is not high. Further, in the conventional monitoring device, only the voltage information is acquired by the ECU.
3, and various other information regarding the unique characteristics of the battery is set in the ECU 3. However, for example, when the battery is replaced with another manufacturer's product, the characteristics of the battery change, so the settings related to them change in the ECU 3
Must be changed in. Therefore, the ECU 3 must be prepared according to the battery, which is inconvenient.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an assembled battery monitoring device capable of eliminating the complexity of wiring. Another object of the present invention is to provide a battery pack monitoring device that allows the ECU 3 to be used universally even if the type of battery changes.

[0006]

A monitoring device for an assembled battery according to the present invention comprises a voltage detection circuit connected across both ends of each module battery of an assembled battery formed by connecting a plurality of module batteries in series, A signal converter that converts the output of the voltage detection circuit into a digital signal and serially outputs the signal.
A voltage measuring unit including a transmission circuit is provided in proximity to the corresponding module battery.

Further, the voltage measuring unit is housed in a side fixing frame for fixing the module battery.

Further, the voltage measuring unit is provided in a part of a container of cells constituting the module battery.

Further, the battery pack monitoring apparatus according to the present invention is
A storage device that stores control information of the module batteries for the assembled battery that is to be centrally monitored and controlled by the central control device, and that control information that is stored is transmitted to the central control device. A battery information unit provided with a transmission circuit is provided for each module battery.

Further, the battery pack monitoring apparatus according to the present invention is
A switch that sets a unique address of a module battery for a battery pack that is to be centrally monitored and controlled by a central controller and a transmission circuit that transmits the address to the central controller, which is formed by connecting a plurality of module batteries in series. A battery information unit provided with was attached for each module battery.

[0011]

According to the assembled battery monitoring apparatus of the present invention, the voltage of each module battery of the assembled battery formed by connecting a plurality of module batteries in series in the voltage measuring unit provided in the vicinity of the corresponding module battery The voltage detection circuit connected between both ends detects it, and the signal conversion / transmission circuit converts the output of the voltage detection circuit into a digital signal and outputs it serially.

Further, the side fixing frame for fixing the module battery also has a role of accommodating the voltage measuring unit.

Further, a part of the cell container constituting the module battery also serves as a case of the voltage measuring unit.

Further, the battery pack monitoring apparatus according to the present invention comprises:
The control information of the module battery stored in the storage device inside the battery information unit additionally provided for each module battery is transmitted to the central controller by the transmission circuit.

Further, the battery pack monitoring apparatus according to the present invention comprises:
The address set by the switch inside the battery information unit provided separately for each module battery is transmitted to the central controller by the transmission circuit.

[0016]

1 is a circuit diagram showing an assembled battery monitoring device and the like according to the present invention. All the illustrated devices are mounted on a moving body such as an electric vehicle. Regarding the internal configuration of the battery pack 1, the above description of FIG. 10 is applied as it is. In addition,
The target storage battery type may be a nickel-hydrogen storage battery, a lead storage battery, or a nickel-cadmium storage battery. 1, the assembled battery 1 includes modules 101, 102 ,. ． ． , And 124 across each of the voltage measuring units 201, 202 ,. ． ． , And 224 are connected to each other. Each of the voltage measuring units 201 to 224 corresponds to the corresponding module 10
The terminal voltages of 1 to 124 are input as signals to be measured, and the power supply of the voltage measuring unit itself is obtained from the terminal voltage of the module. Voltage measurement units 201-2
Each of 24 is a voltage detection circuit 20, a signal conversion / transmission circuit 21, a ROM 22 as a storage device, and a setting switch 2.
Equipped with 3. The voltage measurement unit 201 is connected to an electronic control unit (hereinafter referred to as ECU) 3 by a serial communication line 4a. The voltage measuring unit 201 is connected to the other voltage measuring units 202 to 224 via the serial communication line 4b.

The voltage between both terminals of the module 101 is detected by the voltage detection circuit 20. Then, the output signal of the voltage detection circuit 20 is converted into a digital signal by the signal conversion / transmission circuit 21, and is transmitted via the serial transmission line 4a.
It is transmitted to the ECU 3. Similarly, the voltage between both terminals of each of the modules 102 to 124 is detected and is once transmitted to the voltage measuring unit 201 via the serial transmission line 4b.
After that, it is transmitted to the ECU 3. For example, the voltage measurement is E
Each voltage measurement unit 1 receives a measurement command signal from CU3
01 to 124 do this all at once, and sequentially transmit the measured voltage data to the ECU 3 in serial. In addition, E
The CU 3 is a central control unit that controls various kinds of monitoring and control such as charge control of the assembled battery 1 and life determination.

The signal conversion / transmission circuit 21 is a circuit including a CPU, and can transmit various data stored in the ROM 22 to the ECU 3. For example, each of the voltage measuring units 201 to 224 has an address number of the unit set by the setting switch 23, and by adding the address number to the voltage data and transmitting the voltage data, the voltage measuring unit of the ECU 3 side is changed. Identification becomes easy. That is, it is possible to easily grasp which module has a lowered voltage. Further, various kinds of information are set in the ROM 22.
For example, the types of batteries that make up the assembled battery 1 (nickel / hydrogen storage battery, lead storage battery, nickel / cadmium storage battery, etc.)
Is remembered. Further, the manufacturer of the battery, lot information, battery capacity, etc. are also stored. Furthermore, control information necessary for charging the battery (control voltage value, control temperature value, temperature increase control value, control time, charging efficiency, etc.) and control information necessary for displaying the remaining battery capacity such as self-discharge rate and discharge efficiency are also included. Remembered That is, the voltage measuring units 201 to 224 also have a function as a battery information unit. These various kinds of information are received serially from the ECU 3 and serially transmitted in the same manner as the voltage data transmission described above.
By thus storing all the information about the battery in the voltage measuring units 201 to 224, the ECU
3 does not need to directly hold the information unique to the battery. This not only reduces the storage capacity burden on the ECU 3, but also prevents the setting items of the ECU 3 from being changed even if the type and specifications of the battery change, so that the ECU 3 becomes versatile. This is a great practical effect.

Next, the installation locations of the voltage measuring units 201 to 224 will be described. FIG. 2 is a plan view showing the module 101. Module 101 has 10 cells 1
0 are arranged side by side and electrically connected in series.
It is housed in. A voltage measuring unit 201 housed in a case is attached to the side surface of the container 11. FIG.
FIG. 3 is a plan view showing the assembled battery 1. Twenty-four modules 101 to 124 that form the assembled battery 1 (reference numerals are partially omitted)
6 are arranged vertically and 4 horizontally and are housed in a container 131. Voltage measuring units 201 to 224 are attached to the side surfaces of the modules 101 to 124, respectively.
The input terminals (not shown) of each of the voltage measuring units 201 to 224 are the same as those of the corresponding modules 101 to 124.
It is connected to both terminals of and, and as the measured signal,
Further, it receives each voltage of the modules 101 to 124 as a power source. Only the voltage measuring unit 201 is directly connected to the ECU 3, and the voltage measuring units 202 to 224 are interconnected only by the serial transmission line 4b. In this way, the line that is wired on the upper surface of the assembled battery 1 and that extends between the modules is the serial transmission line 4b.
The connection line with the ECU 3 is only the serial transmission line 4a.
Wiring is clear and simple because it is only. Therefore,
Wiring work is also speeded up, and incorrect connections are less likely to occur.

Hereinafter, the installation locations of the voltage monitoring units 201 to 224 will be described more specifically with reference to Examples 1 to 3. 4 to 6 are drawings relating to the first embodiment.
First, FIG. 4 is a perspective view showing the outline of the structure of the module 101 in this embodiment. The ten cells 10 include side fixing frames 12 and 13 and a fixing metal fitting 1 for connecting them.
Both ends are fixed by 4 (also provided on the back side of the figure) to form a solid individual body as a whole. In addition,
Although the shape of the cell 10 is omitted in this figure, in reality,
Since unevenness is formed on the side surface, even if they are closely arranged, ventilation is possible between them. Also, the fixing bracket 14
A recess for fitting is provided on the side surface. In this embodiment, the voltage measuring unit 201 is provided inside the side surface fixing frame 13. FIG. 5 is a perspective view showing only the side surface fixing frame 13. The side surface fixing frame 13 is provided with recesses inside and insulating support pins 131 are provided at four corners. A terminal block 132 is provided on the upper surface. FIG. 6 is a sectional view showing a state in which the voltage measuring unit 201 is attached to the side surface fixing frame 13. The printed circuit board 201a of the voltage measuring unit 201 is fixed on the insulating support pin 131, and the cover 133 is mounted thereon. The connection line to the outside is connected to the terminal block 132 in FIG.

7 and 8 are diagrams relating to the second embodiment. FIG. 7 is a perspective view showing the cell 10 with a partial cross section. The cell 10 has an electrode group 10H in a container composed of a battery case 10B and a lid 10A, and a positive electrode terminal 10C and a negative electrode terminal 10D project from the lid 10A. Also, the lid 10A
A safety valve 10E is also provided in the. The outer surface of the battery case 10B is provided with a rib 10J for securing a ventilation space and a fixing recess 10K when the module is configured. A recess 10F is formed at one end of the lid 10A.
The voltage measuring unit 201 is formed into a custom IC and inserted into the recess 10F. Figure 8 shows a custom IC in the recess 10F.
It is a fragmentary sectional view which shows the state which provided the converted voltage measurement unit 201A. After inserting the voltage measurement unit 201A,
Attach the cover 10G.

FIG. 9 is a diagram showing the third embodiment, and the same voltage measuring unit 201 as the second embodiment, which is a custom IC.
A (FIG. 8) is inserted into a recess 10L provided under the bottom of the battery case 10B.

[0023]

EFFECT OF THE INVENTION The assembled battery monitoring device according to the present invention constructed as described above has the following effects.

According to a first aspect of the present invention, there is provided a battery pack monitoring device, wherein for each module battery of the battery pack, a voltage detection circuit connected between both ends of the battery pack and a serial transmission output by converting the output of the voltage detection circuit into a digital signal. Since the voltage measurement unit including the signal conversion / transmission circuit that operates is provided close to the corresponding module battery, the wiring from the module battery to the voltage measurement unit is shortened, and the output of the voltage measurement unit is reduced. Since the signals are transmitted serially, it is sufficient to connect the modules in order. Therefore, the wiring is simplified, and the wiring work can be performed quickly and accurately.

According to the battery pack monitoring apparatus of the second aspect, since the voltage measuring unit is housed in the side surface fixing frame for fixing the module battery, a dedicated mounting space is not required, and the battery pack as a whole has a very compact structure. become.

In the assembled battery monitoring device of the third aspect, since the voltage measuring unit is provided in a part of the container of the cells constituting the module battery, the monitoring device also has a very compact structure.

According to a fourth aspect of the present invention, in the assembled battery monitoring device, each module includes a battery information unit including a storage device that stores control information of the module battery and a transmission circuit that transmits the stored control information to an external central control device. Since it is provided separately for each battery, it is not necessary to set various kinds of information on the type of battery and control in the central controller. Further, the module battery and the battery information unit can be handled integrally. Therefore, if the battery to be handled is changed, the battery information unit is also changed to a dedicated battery information unit, and the central control unit can be commonly used.

According to a fifth aspect of the present invention, in the assembled battery monitoring device, a battery information unit having a switch for setting a unique address of the module battery and a transmission circuit for transmitting the address to an external central control device is provided for each module battery. Since it is provided as an accessory, the central control unit that receives the signal from the battery information unit can reliably identify which module battery the signal is from. Therefore, it becomes easy to identify the module battery in which the failure has occurred.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing an assembled battery monitoring device of the present invention.

FIG. 2 is a plan view showing one module of an assembled battery of the present invention and a voltage measurement unit (battery information unit) provided on the side surface thereof.

FIG. 3 is a plan view showing a schematic arrangement configuration of an assembled battery monitoring device according to the present invention.

FIG. 4 is a perspective view showing a battery pack monitoring apparatus according to a first embodiment in which a voltage measuring unit (battery information unit) is provided in a side surface fixing frame of the module.

5 is a perspective view showing a specific example of the side surface fixing frame shown in FIG.

6 is a cross-sectional view showing a state in which a voltage measuring unit (battery information unit) is attached to the side surface fixing frame shown in FIG.

FIG. 7 is a perspective view showing a second embodiment in which a concave portion for accommodating a voltage measuring unit (battery information unit) is provided in a lid portion of a cell which is a minimum unit battery constituting an assembled battery.

8 is a partial cross-sectional view showing a state in which a voltage measuring unit (battery information unit) is inserted in the recess of FIG.

FIG. 9 is a perspective view showing a third embodiment in which a concave portion for accommodating a voltage measuring unit (battery information unit) is provided in a bottom portion of a cell.

FIG. 10 is a diagram showing an internal circuit configuration of an assembled battery.

FIG. 11 is a plan view showing wiring and the like to a conventional assembled battery monitoring device.

[Explanation of symbols]

1 assembled battery 3 ECU (electronic control unit) 10 cell 10A lid 10B battery case 10F, 10L recess 13 side surface fixed frame 20 voltage detection circuit 21 signal conversion / transmission circuit 22 ROM 23 switch 101-124 module 201-224 voltage measurement unit ( Battery information unit)

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Noboru Ito 1006 Kadoma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor, Kanji Takada 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] 1. A voltage detection circuit connected between both ends of each module battery of an assembled battery formed by connecting a plurality of module batteries in series and an output of the voltage detection circuit is converted into a digital signal for serialization. An assembled battery monitoring device, characterized in that a voltage measuring unit comprising a signal conversion / transmission circuit for transmitting and outputting is provided in proximity to a corresponding module battery. 2. The assembled battery monitoring device according to claim 1, wherein the voltage measuring unit is housed in a side surface fixing frame for fixing the module battery. 3. The assembled battery monitoring device according to claim 1, wherein the voltage measuring unit is provided in a part of a container of cells constituting the module battery. 4. A storage device, which stores control information of module batteries, and a control information stored in the storage device, which comprises a plurality of module batteries connected in series and which is to be centrally monitored and controlled by a central controller. A battery pack monitoring device, characterized in that a battery information unit having a transmission circuit for transmitting to a central control device is provided for each module battery. 5. A switch for setting a unique address of a module battery and an address of the central controller for an assembled battery which is formed by connecting a plurality of module batteries in series and which is to be centrally monitored and controlled by the central controller. A battery pack monitoring device, characterized in that a battery information unit having a transmission circuit for transmitting to a battery is additionally provided for each module battery.