KR100389890B1 - Apparatus for measuring voltage and temperature of battery - Google Patents

Abstract

PURPOSE: An apparatus for measuring voltage and temperature of a battery is provided to reduce the power consumption by turning on a voltage measuring module at a measuring period of time. CONSTITUTION: An apparatus for measuring voltage and temperature of a battery includes a constant voltage circuit(42), a relay driver(44), a data processor(47), and a board ID provider(49). The constant voltage circuit(42) receives the power from a battery and outputs stably the power. The relay driver(44) receives the driving power and applies the battery power to the constant voltage circuit. The data processor(47) is operated by the power of the constant voltage circuit in order to convert the battery voltage information to a digital signal. The board ID provider(49) compares the address information of the data processor with the stored address information and outputs the stored address information and the battery voltage information according to a compared result.

Description

A device for measuring the voltage and temperature of the battery

The present invention relates to a device for measuring the voltage and temperature of the battery in a system using a large amount of battery, more specifically, to measure the voltage and temperature of the individual battery, and based on the measured individual battery and voltage and temperature The present invention relates to a battery voltage and temperature measuring device which measures the voltage of a battery and displays the state of an individual battery in which an abnormality has occurred as a result of measuring the entire battery.

In systems such as electric vehicles, electric forklifts, and UPSs of large computers, it is generally necessary to check the voltage of individual batteries to check whether the individual batteries are abnormal. This is because there is a rare case in which the entire battery is abnormal, and since only a few individual batteries may be abnormal in the entire battery, only the individual battery with the abnormality needs to be found and replaced.

However, in the prior art, in most cases, only the voltage of the entire battery is measured (see US Pat. Nos. 5,130,650, 5,047,961, 4,990,885, 4,968,942, 4,333,149). LED is displayed only when the voltage falls below. (U.S. Patent 4,823,086)

1 is a view showing a device for measuring the voltage of a battery using a multiplexer of the prior art, the individual battery 10, a multiplexer 12 for inputting the voltages supplied from the individual battery 10 and the multiplexer ( 12) the main system 14 for controlling.

However, in the technology, as the number of individual batteries 10 increases, the number of wires connected to the multiplexer 12 increases to twice the number of individual batteries 10, the wiring becomes complicated, and the length of the wires increases. As such, the length of the wiring has a disadvantage in that the measurement system is easily affected by noise.

Therefore, the present invention was created in order to solve the above-mentioned problems, and by checking the presence of an abnormal battery and displaying the state of a battery in which an abnormality occurs, when an abnormality occurs in a specific individual battery, each individual The purpose is to provide an individual battery measuring device so that only the battery can be replaced, because the status of the battery that causes an error is displayed on the display even when the voltage of all batteries is not measured individually using the measurement module connected to the battery. It is done.

In addition, in the present invention, the amount of battery used increases or decreases by 0.8% as the temperature of 1 degree Celsius changes with respect to room temperature. Thus, a temperature measuring circuit capable of measuring a change in the performance of the battery according to temperature is provided. Its purpose is to provide.

In addition, in the present invention, the voltage measuring method using the conventional multiplexing using the polling voltage measuring method and the method of US Patent 4,823,086 increase the number of wires to 2n (where n is the number of batteries) in proportion to the number of batteries. On the other hand, it is an object of the present invention to provide a battery voltage measuring device which reduces the number of wiring strands and the wiring length by minimizing the number of wiring strands by minimizing the effect of noise due to the wiring length by connecting only four wires in series.

Measuring device for measuring the voltage and temperature of the battery according to the present invention for achieving the above object

A relay driver for driving a relay connected to the battery to output a voltage supplied from the battery;

A constant voltage circuit unit for converting and outputting an unstable voltage supplied to the battery output by the relay driver to a stable voltage;

Scaling circuit unit for supplying by converting the voltage supplied from the battery by the relay to an input voltage that can be converted in the A / D converter:

A temperature measuring circuit unit for measuring the temperature of the battery by the power supplied from the constant voltage circuit unit:

A data processor for converting an analog signal of voltage and temperature into a digital signal from the scaling circuit unit and the temperature measuring circuit unit;

A board ID circuit for generating an address of voltage measurement modules of each battery and outputting the address to the A / D converter;

A microprocessor managing a voltage measurement module including the relay driver, a constant voltage circuit, a scaling circuit, a temperature measurement circuit, and an A / D converter; And

It is characterized in that it comprises a display unit for receiving the data output from the microprocessor to display the total voltage of the battery and the bad battery.

The constant voltage circuit part of the device for measuring the voltage of the individual battery according to the present invention is characterized by supplying power to the voltage measuring module using two analog switches of the DPDT relay or SPDT type.

The microprocessor of the device for measuring the voltage of the individual battery according to the present invention manages the entire voltage measurement module of the battery, and when the voltage of a specific battery is lowered below a certain level, the battery number is displayed or voiced. It is characterized by informing you of the abnormality of the battery.

The display unit of the device for measuring the voltage of the individual battery according to the invention is characterized in that for receiving the data of the microprocessor to display the voltage and the defective battery of the entire battery.

The voltage measurement module for measuring the voltage of the individual battery according to the present invention is connected in a polling manner, the first voltage measurement module in position when the address is not the magnetic address and the A / D control signal of the lower voltage measurement module Is transmitted to perform a voltage measurement.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

2 is a view showing the configuration of the entire system for measuring the voltage and temperature of individual batteries using a CAN (Control Area Network; CAN) according to the present invention, a plurality of individual batteries 20, It consists of a number of measurement modules 22 corresponding to a plurality of individual batteries 20 and the main system 24 for controlling the operation of the measurement module 22.

In addition, the A terminal of the measuring module 22 is connected to the (+) terminal of the battery, the B terminal is connected to the (-) terminal of the battery, and the C terminal of the terminals of the measuring module 22 differ in position. It is connected to the measurement module 22, the D terminal is connected to the lower measurement module 22 in position, and the C terminal of the uppermost measurement module 22 in position is connected to the main system 24.

In addition, the B terminal of the measuring module 22 is connected to the lower individual battery 20 in position, the A terminal is connected to the upper individual battery 20 in position, and the lowest measuring module ( Terminal B of 22) is connected to the main 24 system and ground.

In addition, between the terminals A and B of each measurement module, there is a voltage V of the battery connected to the measurement module.

3 is a diagram showing the mechanical configuration of the measurement module shown in FIG. 2, where A terminal is connected to the (+) terminal of the individual battery, B terminal is connected to the (-) terminal of the battery. In addition, the C terminal is connected to the upper voltage measurement module in position and the D terminal is connected to the lower voltage measurement module in position. In addition, the highest voltage measurement module and the lowest voltage measurement module are connected to the main system in position, and the ground is connected to the line connecting the lowest voltage measurement module and the main system.

However, the connection method of these terminals is to make it easy to distinguish between them. When connecting to other measuring module, connect to C terminal or D terminal, but set their own address for each voltage measuring module. It does not matter because it can be represented. Detailed signals for the C and D terminals are described in FIG.

FIG. 4 is a detailed view of the measurement module of FIG. 3 of the present invention. The measurement module shown in FIG. 4 is supplied with +12 volts of power from the main system 24 to drive the relay. Relay drive unit 44 for applying power from battery 40 to measurement module, constant voltage circuit unit 42 for receiving power supplied from individual batteries and supplying stable power to each circuit of measurement module, from individual battery 40 The scaling circuit section 46 for converting the supplied voltage into a voltage that can be input to the data processing section, the temperature measuring circuit section 48 for measuring the temperature of the individual battery by receiving a stable power from the constant voltage circuit section 42, the temperature measurement Data processing unit 47 for converting the battery voltage input from the circuit unit and the scaling circuit unit 46 into a digital signal, and generating the address of the measurement module to process the data. Consists of a board ID circuit 49 is provided in (47).

Next, the operation of the measurement module illustrated in FIG. 4 is as follows.

When the main system is operated, the power of +12 volts is supplied to drive the relay 44 of each module to supply the battery power to the constant voltage circuit unit 42 in the measurement module.

The power supplied from the main system driving the relay is supplied only when the microprocessor located in the main system wants to measure the voltage of the battery. The power is not supplied when the voltage measurement module does not need to measure the voltage. Thus, the + 12V and ground power supplies from the main system are initially power supplies for driving relays or analog switches. In this way, since the voltage is supplied from the main system to the voltage measurement module only at the time of measuring the voltage of the battery, unnecessary waste of power can be reduced.

The constant voltage circuit unit 42 receives an unstable voltage that may vary from the battery 40 to 8 to 17V when the relay driver 44 is driven, and supplies the stable voltage to the voltage measuring module. The constant voltage circuit section 42 receives the battery voltage of 8 to 17V and outputs voltages of + 5V and + 12V. At + 5V voltage, typical TTL and data processor are driven and + 12V is used as the voltage of analog circuit.

The scaling circuit 46 converts the input voltage into an input voltage that can be converted by the data processor 47. In general, the voltage of the battery 40 is 8V to 17V, whereas the data processor 47 is limited to the input voltage range, and most of them accept an input voltage of 0V to 5V, but 0V to 10V or -10V to + 10V. In some cases, an input voltage of? Therefore, the voltage is divided by using a resistor or an OP amplifier so as to be accepted by the voltage of the input range received by the data processor 47.

The temperature measuring circuit 48 is a circuit for performing temperature measurement to compensate for the change in the capacity of the battery according to the change in temperature. The interface circuit can be configured using a thermistor or a thermocouple or dedicated IC for temperature measurement.

The board ID circuit unit 50 is for representing a plurality of voltage measuring module unique addresses, and has a unique address set by a dip switch.

FIG. 5 is a detailed view of the main system shown in FIG. 2, and inputs data output from the CAN controller and driver unit 50, the microprocessor 52 and the microprocessor 52 managing the entire voltage measurement module. It is composed of a display unit 54 for receiving the total voltage of the battery and the defective battery, the CAN controller and driver unit 80 and the microprocessor 52 provides mutual data and control signals.

As such, the main system 24 checks the voltage and temperature of the individual batteries from the entire individual voltage measurement module, calculates the total battery voltage by adding the individual battery voltages based on this, and calculates the total voltage and the defective battery below a certain voltage. It finds and displays.

Next, the operation of the main system shown in FIG. 5 will be described.

The CAN controller and driver unit 50 serves to match general digital data of the microprocessor 52 to the data format of CAN.

The display unit 54 receives data output from the microprocessor 52 and displays a total voltage and a number of batteries in which an abnormality has occurred.

Next, the operation principle of the device for measuring the voltage and temperature of the individual batteries with reference to FIGS. 2 to 5 according to the present invention.

The power of the individual battery 40 is connected to the relay of the measurement module of the individual battery 40. When the microprocessor 52 wants to read the voltage of the individual battery 40, the main system (FIG. 5) From the + 12V and ground power supply to the measurement module of the individual battery, the relay driver 44 drives the relay to supply power to all the measurement module (Fig. 4).

The relay driver uses a combination of two sets of analog switches (not shown) of a double pole double throw (DPDT) type or a single pole double throw (SPDT) type.

The measurement module of each individual battery receives power from each individual battery and generates + 5v and + 12v power in the constant voltage circuit unit 42 using a voltage rectifier to supply + 5v power to the data processing unit 47. ) And a + 12V power supply to the scaling circuit section 46 and the temperature measuring circuit section 48.

The data processing unit 47, which receives the appropriate voltage from the scaling circuit unit 46 and the temperature measuring circuit unit 48, can be controlled through the CAN bus, and has an A / D control register (not shown) and A / D. There are registers (not shown in the figure) that store the converter and A / D conversion results, and use the ones that can be set by their address dip switches.

Data is transmitted and received between the microprocessor 52 of the main system (FIG. 5) and the measurement module (FIG. 4) via two serial lines, a CAN high line and a CAN low line.

When power is supplied to the measurement module (Fig. 4) of the individual battery and the main system (Fig. 5) wants to read the voltage of the specific measurement module, the microprocessor 52 can be specified through the CAN controller and driver 50. A signal for starting the data processor 47 of the measurement module of the individual battery at the address is sent. After a predetermined time has elapsed, the data processing unit 47 of the measurement module of the specific address individual battery, via the CAN controller and driver 50, converts the result of A / D with its own address into the microprocessor 52. Will be sent to.

The microprocessor 52 reads the data converted from the data terminal and converts it to the actual voltage, adds all the voltages of the individual batteries to calculate the total voltage, and finds a defective battery having a predetermined voltage or less and displays the defective value in the display unit 54. send.

The display unit 54 receives the data supplied from the microprocessor 50 and displays the number of individual batteries in which the total voltage and abnormality have occurred.

Therefore, as described above, the method for measuring the voltage and temperature of the individual battery using the CAN according to the present invention has an effect of preventing unnecessary power loss because the voltage measuring module is turned on only at the required time.

In addition, since the voltage of the individual battery is measured, if any one of the individual battery is abnormal, it has the effect of immediately knowing whether the battery is abnormal even without measuring the voltage of all the batteries.

In addition, using the conventional multiplexing method, the number of lines to be measured is doubled to the number of batteries, but since only four lines are connected in series, the number of lines can be greatly reduced and the length of the lines is shortened. Has the effect of reducing the effect of.

Moreover, even if the number of individual batteries to be measured increases, only the measurement module needs to be inserted, which has the effect of maximizing work efficiency when expanding and assembling the system.

1 is a configuration diagram of the prior art.

2 is an overall configuration diagram according to the present invention.

3 is a structural diagram according to the present invention.

4 is a block diagram showing a voltage measurement module of the present invention.

5 is a diagram showing the main system of the present invention.

Claims (5)

A constant voltage circuit unit configured to generate stable power by receiving power from a connected battery; A relay driver which receives driving power and connects the battery power to the constant voltage circuit part; A data processing unit operated by receiving a predetermined power from the constant voltage circuit unit, and converting the battery voltage information into a digital signal and outputting the digital signal; And A board ID providing unit which provides its address information to the data processing unit; And the data processor compares the received address information with its own address information and outputs its own address information together with the battery voltage information. The method of claim 1, And a scaling circuit unit which is operated by receiving power from the constant voltage circuit unit and converts the battery voltage value into a value within a range that can be processed by the data processing unit and supplies the scaling circuit unit to the data array unit. The method of claim 1, It is operated by receiving power from a singer constant voltage circuit unit, and further comprising a temperature measuring circuit unit for measuring the battery temperature and provides it to the data processing unit, And the data processor outputs the battery temperature information together with battery voltage information. A constant voltage circuit unit for generating stable power by receiving power from a connected battery; A relay driver which receives driving power and connects the battery power to the constant voltage circuit; A data processor operating by receiving a predetermined power from the constant voltage circuit unit, converting the battery voltage information into a digital signal, and outputting the digital signal; A battery voltage measuring unit including a board ID providing unit providing its address information to the data processing unit; And An input / output unit which receives a voltage measurement command of the battery from a user and provides the measured battery voltage information to a user; A battery voltage measurement including a microprocessor which supplies driving power to the battery measuring device according to a voltage measuring command of the battery provided from the input / output unit, receives the battery voltage information from the battery measurement value, and provides the battery voltage information to the input / output unit Including a control unit, The data processor compares the received address information with its own address provided from the board ID providing unit and outputs its own address information together with the battery voltage information when the data is matched. . The method of claim 4, wherein The input / output unit of the battery voltage measurement control unit receives selection information for selecting a battery to measure voltage from among a plurality of batteries, and provides the measured voltage information of the selected batteries to the user. The microprocessor of the battery voltage measurement controller transmits a driving power and address information of the battery voltage measurement unit together with a battery power measurement unit to measure the voltage of the selected battery according to the selection command provided from the input / output unit. Battery voltage management device, characterized in that for receiving the voltage information of the battery corresponding to it from the voltage measuring unit and provided to the input and output unit.