KR20120004670A - Battery sensor for vehicle - Google Patents

Abstract

PURPOSE: A battery sensor for a vehicle is provided to measure the internal resistance of a battery for calculating the cold cranking ampere, and the charging state of the battery. CONSTITUTION: A battery sensor(1) for a vehicle for calculating the charging state of a battery(B) for the vehicle capable of charging and discharging electric energy comprises the following: a sensing unit(10) including a temperature sensor(11) for measuring the temperature of the batter, a voltage measuring sensor(12) for measuring the voltage of the battery, and an internal resistance measuring sensor(13) for measuring the internal resistance of the battery; and a controller(20) estimating the current battery condition based on the information obtained from the sensing unit, calculating the battery charging condition, and transmitting the obtained battery charging condition to an electronic control unit(E) of the vehicle.

Description

Automotive Battery Sensors {BATTERY SENSOR FOR VEHICLE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery sensor for a vehicle, and more particularly, to measure the internal resistance of a battery and to measure the state of health of the battery due to a change in the internal resistance, a cold starting current (CCA), and a cold starting current (CCA). The present invention relates to a vehicle battery sensor capable of accurately calculating a state of a battery even in a dynamic load situation by calculating a state of charge (SOC) of the battery.

In general, a vehicle that uses gasoline or heavy oil as its main fuel to obtain power for driving with explosive power due to its combustion uses a battery for driving a starting motor or supplying electric current required for other electronic components at engine start-up.

In particular, the recent increase in the importance of the battery as the addition of multimedia devices, convenience and safety devices in the car, according to the recent statistics, about 36% of car failures are caused by electrical defects, more than 50% of them Batteries have been shown to be the cause and it is becoming important to know the exact state of the battery.

On the other hand, recently developed automobile technology includes technologies to freely use electronic devices such as air conditioners, heaters, and navigation even when the vehicle is turned off while the vehicle is stopped and technologies that automatically turn off the engine to reduce idling during signal waiting. Getting started. The purpose of this technique is to reduce pollution and improve fuel efficiency by turning off the engine and preventing idling using the battery during the stop. However, in order to use this technology, it is difficult to restart, so it is important to know the state of charge (SOC) of the battery at all times.

Accordingly, in recent years, high-end automobiles are beginning to be applied with battery sensors that measure the condition of the battery in order to cope with CO2 regulations through the prevention of vehicle failure, safety and fuel efficiency improvement.

The conventional vehicle battery sensor counts the number of charge / discharge cycles of the battery to uniformly calculate the state of health (SOH) of the battery and charge the battery by measuring the voltage, current, and temperature of the battery according to the calculated health state. Calculate the state.

However, such a conventional vehicle battery sensor has a calculated state of charge because the state of health is calculated uniformly by the number of charge / discharge cycles. The error has a big problem.

On the other hand, since the viscosity of various oils is increased to start a stopped engine after the engine of the automobile is cooled, the resistance increases. Especially in winter, the resistance is so great that the car does not start.

Sufficient current must be supplied to the starting motor to reach the minimum RPM for starting the engine. This requires not only a sufficient battery charge, but also the cold start current, which means the maximum amount of current discharged during cold start even in the same battery capacity. CCA; Cold Cranking Amphere should be large. Therefore, the information on the cold starting current of the battery is information that can prevent the starting failure upon restarting together with the state of charge.

However, the conventional vehicle battery sensor for measuring the voltage, current and temperature of the battery has a problem that can not provide the information about the state of charge required when restarting because the cold starting current (CCA; .

The present invention was conceived by recognizing the above point is an object of the present invention by measuring the internal resistance of the battery by changing the internal resistance of the battery state (SOH; State Of Health), cold start current (CCA; Cold) The present invention provides a vehicle battery sensor capable of accurately calculating the state of a battery even in a dynamic load situation by calculating a cranking ampere and a state of charge (SOC) of the battery.

In order to achieve the above object, the vehicle battery sensor according to the present invention is a vehicle battery sensor for calculating a state of charge of a vehicle battery in which electrical energy is charged and discharged so as to supply electrical energy to a vehicle. Sensing unit including an internal resistance measuring sensor to measure the voltage and the voltage measuring sensor to measure the voltage of the battery, the actual health of the battery from the data on the relationship between the internal resistance and the health state of the battery and the internal resistance measured by the sensing unit Estimating the state, calculating the state of charge of the battery in the state of health estimated from the data on the relationship between the voltage and the state of charge for each health state and the voltage measured by the sensing unit and calculates the calculated state of charge of the electronic control unit of the vehicle It characterized in that it comprises a controller for transmitting to.

In the vehicle battery sensor according to the present invention, the controller unit calculates a cold start current of the battery from data on the relationship between the internal resistance and the cold start current of the battery and the internal resistance measured by the sensing unit. The cold start current is transmitted to the electronic control unit of the vehicle.

In addition, the vehicle battery sensor according to the present invention, the internal resistance measuring sensor is characterized in that for measuring the internal resistance of the battery by applying a pulse current of DC to the terminal of the battery.

In addition, the vehicle battery sensor according to the present invention is characterized in that the sensing unit and the controller unit is molded integrally or integrally mounted in the interior of the body of the battery.

By the above configuration, the vehicle battery sensor according to the present invention relates to a vehicle battery sensor, and more particularly, by measuring the internal resistance of the battery and the health state of the battery due to the change in the internal resistance (SOH; Health), Cold Cranking Ampere (CCA) and State of Charge (SOC) of the battery are calculated to have the advantage of accurately calculating the state of the battery even under dynamic load conditions.

1 is a block diagram showing the configuration of a vehicle battery sensor according to an embodiment of the present invention;
2 is a flowchart illustrating the operation of a vehicle battery sensor according to an embodiment of the present invention.
Figure 3a is a graph showing the relationship between the internal resistance of the battery and the health state of the battery in a vehicle battery sensor according to an embodiment of the present invention
Figure 3b is a graph showing the relationship between the internal resistance of the battery and the cold start current of the battery in a vehicle battery sensor according to an embodiment of the present invention
Figure 3c is a graph showing the relationship between the state of charge and the voltage of the battery according to the health state of the battery in the vehicle battery sensor according to an embodiment of the present invention

Hereinafter, a vehicle battery sensor according to an exemplary embodiment of the present invention will be described in detail with reference to the exemplary embodiment shown in the drawings.

1 is a block diagram showing the configuration of a vehicle battery sensor according to an embodiment of the present invention, Figure 2 is a flow chart showing the operation of the vehicle battery sensor according to an embodiment of the present invention, Figure 3a is a present invention In the vehicle battery sensor according to an embodiment of the graph showing the relationship between the internal resistance of the battery and the health state of the battery, Figure 3b is a cold battery of the internal resistance of the battery and the battery in the vehicle battery sensor according to an embodiment of the present invention 3C is a graph illustrating a relationship between a starting current, and FIG. 3C is a graph illustrating a relationship between a charging state of a battery and a voltage according to a health state of a battery in a vehicle battery sensor according to an exemplary embodiment of the present invention.

The vehicle battery sensor 1 according to the present invention is a state of health (SOH), cold start current (Cold Cranking Ampere) and charging of the vehicle battery (B) in which the electrical energy is charged and discharged to supply the electrical energy to the vehicle. A state of charge (SOC) is calculated and transmitted to an electronic control unit (E), that is, an electronic control unit (ECU) of the vehicle, and includes a sensing unit 10 and a controller unit 20.

The sensing unit 10 is a component for collecting voltage, temperature, and internal resistance, which are information for estimating the state of the vehicle battery B. Referring to the drawings, the sensing unit 10 includes a temperature measuring sensor 11, a voltage measuring sensor 12, an internal resistance measuring sensor 13, and a multiplexer 14 (MUX).

The temperature measuring sensor 11 is for measuring the temperature of the vehicle battery B in real time, and is mounted on the battery B to measure the internal temperature of the battery B.

The voltage measuring sensor 12 is a component for measuring the voltage through the anode of the vehicle battery (B).

The internal resistance measuring sensor 13 is a component for measuring the internal resistance of the battery (B). The present invention is characterized in that the internal resistance of the battery (B) is configured to measure the health state and cold start current of the battery in real time from the internal resistance of the battery (B), which changes according to the state of the battery, that is, temperature, health state, and the like.

In particular, the present invention is characterized in that the internal resistance measuring sensor 13 measures the internal resistance of the battery by applying a direct current pulse current to the terminal of the battery. That is, the internal resistance measuring sensor 13 connects each of the source terminal and the measurement terminal that apply a direct current pulse current to the battery B to both terminals of the battery, and oscillates the direct current pulse current at the source terminal. The internal circuit of the battery is measured to measure the resistance of the battery internal circuit, that is, the battery internal resistance, from the pulse current sensed by the measurement terminal. Accordingly, the present invention has the advantage that the internal resistance can be easily and accurately measured without being influenced by the load connected to the battery B and external noise.

The multiplexer 14 is configured to transmit a plurality of signals measured from the temperature measuring sensor 11, the voltage measuring sensor 12, and the internal resistance measuring sensor 13 to the controller 20.

The controller 20 controls the operation of the sensing unit 10, and in particular, information about a temperature T, a voltage V, and an internal resistance IR of the battery measured by the sensing unit 10. The A / D converter 21, the microprocessor 22, and the communication unit 23 are configured for estimating and calculating the state of the battery.

The A / D converter 21 is for converting an analog signal transmitted from the sensing unit 10 into a digital signal. In this process, the signal may be filtered.

The microprocessor 22 compares the stored reference data with information about the measured temperature (T), voltage (V), and internal resistance (IR) of the battery to estimate and calculate the state of the battery. It is a configuration for performing an operation for estimating and calculating. In order to estimate and calculate the state of the battery, the reference data stored in advance in the microprocessor 22 includes data on the relationship between the internal resistance and the health state of the battery, data on the relationship between the internal resistance and the cold start current of the battery, and each health. There is data on the relationship between voltage and state of charge for each state. 3A to 3C show the relationship between the internal resistance and the health state of the battery, the relationship between the internal resistance and the cold start current of the battery, and the relationship between the voltage and the state of charge for each health state, respectively.

In general, as the battery ages, the internal resistance increases constantly from the initial internal resistance. As the internal resistance increases, the health of the battery deteriorates. Can be obtained through According to FIG. 3A, which illustrates the relationship between the internal resistance of the battery and the health state of the battery, when the internal resistance IR of the battery is smaller than the initial value, the health state (SOH) of the battery is high and the internal resistance (IR) of the battery is high. If the increase is large compared to the initial value, the health state (SOH) of the battery has a small relationship. The data on the relationship between the internal resistance of the battery and the health state of the battery is obtained in advance and the microprocessor 22 is previously obtained. The data is stored and used as reference data for estimating battery health status and cold start current.

The present invention estimates the actual health state of the battery in real time from the internal resistance measured by the sensing unit 10 using the relationship data between the battery's internal resistance and the health state of the battery. That is, referring to FIG. 3A, a process of estimating an actual state of health will be described. When the internal resistance IR measured by the sensing unit 10 is increased by 0% from the initial value, aging of the battery is hardly achieved. The health state SOH, which is the state H1, is calculated as 100%, and when the internal resistance measured by the sensing unit 10 is increased by 55% from the initial value, the battery is in a state where the aging is about 50% (H2). Health status is calculated at 50%.

In addition, the present invention is calculated from the cold starting current (Cold Cranking Ampere) from the internal resistance measured by the sensing unit 10 using the relationship data of the internal resistance of the battery and the cold starting current of the battery in the controller 20 Cold Cranking Ampere is calculated. That is, the process of estimating the actual cold starting current (Cold Cranking Ampere) with reference to Figure 3b showing the relationship between the internal resistance and the cold starting current of the battery, the internal resistance measured by the sensing unit ( If the IR) is 5.5m, the cold start current is calculated as 545A. Data on the relationship between the internal resistance and the cold start current of the battery can be obtained through experiments for each battery.

On the other hand, according to Figure 3c showing the relationship between the voltage and charge state of each health state, the state of charge (SOC) of the battery of each health state is the state of charge (SOH) of the battery is large, if the battery voltage (V) is large, When the voltage V is small, the state of charge (SOC) of the battery has a small relationship. The data on the relationship between the voltage of the battery and the state of charge of the battery is obtained in advance and stored in the microprocessor 22 in advance. do. The present invention calculates the current state of charge of the battery from the voltage measured by the sensing unit 10 by using the relationship data between the voltage of the battery and the state of charge of the battery in the controller unit 20. That is, FIG. 3C shows the relationship between the voltage of the battery and the state of charge of the battery in the state of health 100% (H1) and the relationship between the voltage of the battery and the state of charge of the battery in the state of health 60% (H2). Referring to the process of calculating the actual state of charge with reference to, when the voltage (V) is measured at 14V in the sensing unit 10, the state of charge (SOC) in the state (H1) of the health state of the battery 100% ) Is calculated as 100% (C1), and the state of charge (SOC) in the state (H2) where the state of health of the battery is 60% is calculated as 65% (C2).

The data on the relationship between the change of the internal resistance of the battery and the health state (SOH) of the battery, the cold start current data of the internal resistance and the battery, and the data of the voltage and state of charge for each health state vary depending on the type of battery. Can be obtained experimentally.

The communication unit 23 transmits data such as health state, state of charge, and measured battery voltage, internal resistance, and the like calculated by the microprocessor 22 to the electronic control unit E of the vehicle, and the electronic control unit E of the vehicle. ) Is a configuration for receiving a command or data required for sensing the battery.

Meanwhile, the vehicle battery sensor 1 according to the present invention configured as the sensing unit 10 and the controller unit 20 as described above is protected by the sensing unit 10 and the controller so as to be protected from moisture, vibration, dust, temperature, gas, and the like. The unit 20 may be integrally molded and attached to the battery B, and the measurement terminal of the sensor unit 10 may be connected to the battery B. In addition, the vehicle battery sensor 1 according to the present invention may be mounted inside the battery so as to be protected from moisture, vibration, dust, temperature, gas, etc., and may be configured to be integrated with the battery. That is, the battery sensor 10 is housed inside a battery manufactured to accommodate the sensor, etc. of the battery case, and the measurement terminal of the sensor is connected to a preconfigured connection terminal inside the battery to be integrated with the battery. Can be.

The vehicle battery sensor 1 according to the exemplary embodiment of the present invention configured as described above calculates the state of the battery, that is, the health state, the cold start current, and the charge state, in the same manner as in FIG. 2. That is, the sensing unit 10 measures the voltage V, the internal resistance IR, and the temperature T of the battery in real time, and measures the internal resistance IR measured using predetermined health state and internal resistance relation data. Estimates the state of health (SOH), calculates the cold start current from the measured internal resistance (IR) using the relationship between the predetermined internal resistance and the cold start current, and the voltage at the estimated state of health (SOH). The state of charge (SOC) of the battery is calculated from the measured voltage (V) by using the relationship between the state of charge and the state of charge. In particular, the present invention measures the internal resistance and voltage of the battery in real time at the dynamic load applied to the battery according to the driving as well as the engine starting step, reflecting the health condition that changes in real time, accurate dynamic charging state (D -SOC; Dynamic SOC) can be obtained.

The vehicle battery sensor described above and illustrated in the drawings is only one embodiment for implementing the present invention, and should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is defined only by the matters set forth in the claims below, and the embodiments which have been improved and changed without departing from the gist of the present invention will be apparent to those skilled in the art. It will be said to belong to the protection scope of the present invention.

1 battery sensor
10 sensing part
11 Temperature Sensor
12 Voltage measuring sensor
13 Internal resistance measuring sensor
14 multiplexer
20 Controller
21 A / D Converter
22 microprocessor
23 Communications Department
B battery
Electronic controls of the E vehicle

Claims (4)

A vehicle battery sensor for calculating a state of charge of a vehicle battery in which electrical energy is charged and discharged to supply electrical energy to a vehicle,
A sensing unit including an internal resistance measuring sensor for measuring internal resistance of the battery, a voltage measuring sensor for measuring the voltage of the battery, and a temperature sensor for measuring the temperature of the battery;
From the data on the relationship between the internal resistance and the health state of the battery and the internal resistance measured by the sensing unit, the actual health state of the battery is estimated, and the data on the relationship between the voltage and charge state of each health state and the sensing unit And a controller unit for calculating a state of charge of the battery in the estimated state of health from the voltage measured by the controller and transmitting the calculated state of charge to the electronic control unit of the vehicle. The method of claim 1,
The controller unit calculates a cold start current of the battery from data on the relationship between the internal resistance and the cold start current of the battery and the internal resistance measured by the sensing unit, and transmits the calculated cold start current to the electronic control unit of the vehicle. Vehicle battery sensor, characterized in that. The method according to claim 1 or 2,
The internal resistance measuring sensor is a vehicle battery sensor, characterized in that for measuring the internal resistance of the battery by applying a pulse current of DC to the terminal of the battery. The method according to claim 1 or 2,
And the sensing unit and the controller unit are integrally molded or integrally mounted in the body of the battery.

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