KR0183068B1 - Battery charging control device of ev and its method - Google Patents

Abstract

Battery temperature sensing means; Battery ambient temperature sensing means; Battery voltage sensing means; Charging current sensing means; A charge mode setting switch; When the power is applied, it detects the over-discharge state of the battery, outputs the 1-step constant current charge signal, which is a common step of all current charging methods, detects the 1-level full charge state according to the charge limit temperature method, and then sets the charge set by the user. If the set charging method is 80% charging method, the compensation charging signal is output according to the charging ambient temperature and charging efficiency.If the set charging method is the three-step constant current charging method, the two-step constant current charging signal is output. After detecting the two-stage full charge state according to the charge limit temperature method, it outputs the three-stage constant current charge signal again, and detects the full charge state according to the charge limit temperature method, the voltage limit method, and the voltage drop detection method. In case of the constant current / constant voltage / constant current method, it outputs a two-stage constant voltage charge signal and charge limit is on. After detecting the two-stage full charge state according to the method, and performing the three-stage constant current charging, and then detecting the full charge state according to all the charge termination control methods described above, the full charge state of the battery is Charge control means for outputting a charge end signal if detected; The battery charging control device of the electric vehicle, which is composed of battery charging means for performing a charging operation of the battery, charges the battery according to the charging method set by the user and then applies all the charging completion detection methods that can be performed according to the charging method. In addition, by sensing the completion state of the battery can reduce the consumption rate of the battery due to overcharge and improve the stability, it can provide a method.

Description

Battery charging control device and method for electric vehicle

1 is a block diagram illustrating a configuration of a battery charge control apparatus for an electric vehicle according to an exemplary embodiment of the present invention.

Figure 2a is a characteristic diagram of the first charging method of the battery charge control device of an electric vehicle according to an embodiment of the present invention.

Figure 2b is a characteristic diagram of a second charging method of the battery charge control device for an electric vehicle according to an embodiment of the present invention.

3 is a general operation flowchart of a method for controlling battery charge of an electric vehicle according to an embodiment of the present invention.

4A to 4E are detailed operation flowcharts of a method for controlling battery charge of an electric vehicle according to an embodiment of the present invention.

The present invention relates to a battery charging control device and method of the electric vehicle. More specifically, the battery of the electric vehicle for terminating the charge by charging the battery to drive each electric device of the same vehicle and then detects a full charge state A charging control device and method thereof are provided.

In general, there are two systems of power supply for each electric device of a vehicle, a battery and a charging device. While the engine is running, the charging device is powered by the power of each electric device, but when the engine is stopped or the engine is started, it cannot be powered from the charging device. do.

There are primary and secondary batteries in storage batteries, and rechargeable batteries are used in automobiles. Secondary batteries include lead acid and alkaline batteries, and lead acid batteries are used as automotive batteries.

The charging of the battery is carried out when the battery is shipped from the manufacturing company to supercharge the wet battery that does not contain electrolyte, and to supplement the capacity consumed when the used battery is discharged. ).

The supplementary charging method is generally divided into normal charging and rapid charging, and the corner charging is classified into constant current charging, constant voltage charging, and single current charging, and the rapid charging is performed when there is no time to replenish the battery when the battery is discharged. It charges with a large current that is several times the total current.

The constant current charging method is a method of charging with a constant current from the start of the charge to the end, the temperature of the electrolyte solution during charging should not exceed a certain temperature (about 45 ℃), the explosion because the mixed gas of hydrogen gas and oxygen gas is generated during charging Keep flames away from them for prevention.

The constant voltage charging method is a method of charging at a constant voltage from the beginning of the charging to the end. In the initial stage of charging, a large charging current flows, but a small current flows as charging progresses, so that almost no current flows at the end of charging.

Therefore, there is little gas generation and the efficiency is good, but since a large current flows in the initial stage of charging and the influence on the life of the battery is large, there is a drawback that a corresponding equipment must be provided, and this charging method is not used much before replenishment.

The single-phase current charging method is a method of charging by gradually decreasing the current during charging, which is sometimes used because it increases the charging efficiency and decreases the temperature rise of the electrolyte.

In addition, the step-by-step current charging method reduces the current at the end of the charge to prevent power loss during gas generation and to prevent the risk of explosion by the gas.

However, when the battery is fully charged when the battery is fully charged, but the charging current continues to flow into the battery, there is a negative curve which does not increase the voltage of the battery but rather decreases, which causes a lot of heat in the battery. Problems that have a fatal effect on the lifespan and efficiency of the system arise.

Therefore, conventionally, in order to solve the above problems, a method of detecting the state of charge of the battery according to each charging method and terminating the charging is used.

Generally, battery charging modes include a constant current charging method and a constant current / constant voltage charging method.

In the constant current charging method, a method of detecting a state of completion of charging of a battery includes a temperature limit method, that is, a TCO (Temperature Cut-Off) method, a flat time limiting method, and a voltage drop method, that is,-△ The V method is used.

Since the TCO method is dangerous when the battery temperature is too high during constant current charging, the TCO method is controlled according to the charge limit temperature set according to the spec of the battery manufacturer. It is desirable to determine the charge limit temperature in consideration of this.

In the above voltage drop method, the battery uses a voltage drop phenomenon due to the generation and recombination of internal gas after the maximum battery voltage is generated in the full charge zone, and the optimum battery voltage is obtained by experimenting. Control the charge.

The flat-time limiting method described above sets a -ΔV detection time limit to prevent the charging from being continued when the -ΔV value is not detected sensitively to the surrounding variables during constant current charging of the battery. If -ΔV is not detected during the -ΔV detection time limit, battery charging is terminated.

In the constant current / constant voltage charging method, a method for detecting a charging state includes a TCO method and a charging current limiting method.

In the charging current limiting method, when a constant current is charged in the constant current charging and then the constant voltage charging, a large charging current flows initially, but the charging current decreases with time. At this time, the charging is terminated when the charging current is lower than the specified value.

An object of the present invention is to charge a battery of a vehicle, that is, a battery, by charging the battery according to the charging method set by the user and then applying all the charging completion detection method that can be performed according to the charging method, the battery The present invention is to provide an electric vehicle battery charging control device and method for detecting a battery's completion state according to charging temperature, charging voltage, and current flowing during charging / discharging to reduce battery consumption rate and improve stability. have.

The configuration of the present invention to achieve the above object, the battery temperature sensing means for detecting the temperature of the battery and outputs an electrical signal corresponding thereto; Battery ambient temperature sensing means for sensing an ambient temperature of the battery and outputting an electrical signal corresponding thereto; Battery voltage sensing means for sensing a charging voltage of the battery and outputting an electrical signal corresponding thereto; Current sensing means for measuring a current during charging / discharging of the battery and outputting an electrical signal corresponding thereto; A charge mode setting switch configured to set an 80% charging method, a three-stage charging method, and a constant current / constant voltage / constant current charging method of the battery; When the power is applied, it detects the light discharge state of the battery, outputs the one-step constant current charge signal, which is a common step of all current charging methods, detects the one-step full charge state according to the charge limit temperature method, and then sets the charge set by the user. If the set charging method is 80% charging method, the compensation charging signal is output according to the charging ambient temperature and charging efficiency.If the set charging method is the three-step constant current charging method, the two-step constant current charging signal is output. After detecting the two-stage full charge state according to the charge limit temperature method, it outputs the three-stage constant current charge signal again, and detects the full charge state according to the charge limit temperature method, the voltage limit method, and the voltage drop detection method. In case of the constant current / constant voltage / constant current method, it outputs a two-stage constant voltage charge signal and charge limit is on. After detecting the two-stage full charge state according to the diagram method, performing three-stage constant current charging, and then detecting the full charge state according to all the charge termination control schemes described above, and then, the full charge state of the battery according to the charging operation. A charging control means for outputting a charging end signal when is detected; Battery charging means for performing a charging operation of the battery in accordance with the signal output from the charge control means.

Another aspect of the present invention for achieving the above object is the step of initializing all the use parameters when the power is applied, and then detecting the battery over-discharge state in accordance with the voltage difference between the initial voltage of the battery and a certain time after charging; Performing a one-step constant current charging operation, which is a common step of all charging methods, and detecting a one-step full charge state according to the charge limit temperature method; Determining the charging method set by the user when the first step charging is completed; Replenishing the lost amount according to the charging ambient temperature and the charging efficiency when the set charging method is the 80% charging method; When the charging method set above is a three-step constant current charging method, the two-step constant current charging operation is performed, and then, the two-stage full charge state is detected according to the charging limit temperature method, and when the two-step charging ends, the three-step constant current charging operation is performed. Detecting the three-stage full charge state according to the charge limiting temperature method, the voltage limiting method, and the voltage drop detection method, and terminating the three-step constant current charging when the three-step charging ends; When the charging method set above is a constant current / constant voltage / constant current charging method, a two-stage constant voltage charging operation is performed, and then a two-stage full charge state is detected according to the charging limit temperature method. After performing the constant current charging operation, a three-step full charge state is detected according to the charge limit temperature method, the voltage limit method, and the voltage drop detection method.

When described with reference to the accompanying drawings the most preferred embodiment which can easily implement this invention by the above configuration as follows.

1 is a block diagram illustrating a configuration of a battery charging control apparatus for an electric vehicle according to an exemplary embodiment of the present invention, and FIG. 2a is a characteristic diagram of a first charging method for a battery charging control apparatus for an electric vehicle according to an exemplary embodiment of the present invention. 2b is a characteristic diagram of a second charging method of a battery charging control apparatus for an electric vehicle according to an embodiment of the present invention, and FIG. 3 is an overall operation flowchart of the battery charging control method for an electric vehicle according to an embodiment of the present invention. 4a to e are detailed operation flowcharts of a battery charging control method for an electric vehicle according to an embodiment of the present invention.

As shown in FIG. 1, a configuration of a battery charge control apparatus for an electric vehicle according to an exemplary embodiment of the present invention includes a battery temperature detector 1 that detects a temperature according to charging of a battery of an automobile, and a temperature around the battery. A battery ambient temperature sensing unit 2 for sensing a battery voltage, a battery voltage sensing unit 3 for sensing a voltage of a battery, a charging current sensing unit 4 for sensing a current charged in a battery, and a charging method A charge mode setting switch (S1), an input interface (5) connected to the output terminals of the sensing units (1 to 4) and the charge mode setting switch (S1) to convert an input analog signal into a digital signal and output the digital signal; Connected to the output terminal of the input interface 5 to charge the battery according to the set charging method and check the full charge state to determine whether the end of charging and the corresponding control signal, the current charge state and A charging control unit 6 for outputting an information signal for displaying the previous method, an output interface 7 for converting and outputting a signal connected to an output terminal of the charging control unit 6 into a corresponding digital signal, and A charging power unit 8 for controlling the charging of the battery according to a control signal input and connected to an output terminal of the output interface 7 and a current charging according to the input information signal connected to the output terminal of the output interface 7. An information display unit 11 indicating a state and a charging method, a DC-DC converter 10 connected to a battery to supply driving power to the operating device, and an auxiliary battery connected to an output terminal of the DC-DC converter 10. It consists of 12.

The main battery according to the embodiment of the present invention is made of a lead acid battery, but is not necessarily limited thereto.

The operation of the battery charge control device of the electric vehicle according to the embodiment of the present invention by the above configuration is as follows.

As shown in FIG. 3, the method of charging a vehicle battery according to an exemplary embodiment of the present invention detects an overdischarge state of an initial battery, performs one-step constant current charging corresponding to all charging methods, and then sets a charging method. If the three-stage constant current charging method is set, perform the two-stage and three-stage constant current charging, and then detect the full charge state.If it is set to the constant current / constant voltage / constant current charging method, perform the constant voltage / constant current charge and then the full charge state. When the 80% charging method is set, the charging amount due to the difference in the battery voltage according to the ambient temperature is made.

Detailed operations for performing the charging operation as described above will be described with reference to the accompanying FIG.

When power is applied, the charging control unit 6 initializes all operating circuits and use parameters (S110), and then measures the voltage state of the initial main battery 9 (S120).

The battery voltage detector 3 measures the voltage of the main battery 9 before being charged and outputs an electrical signal corresponding thereto to the charging controller 6. The voltage signal output from the battery voltage sensing unit 3 is converted into a digital signal through the input interface 5 and input to the charging control unit 6.

In the above, the charging control unit 6 measures the main battery voltage (Vb: t = 0) before performing the charging operation, and then outputs a charging signal for performing constant current charging. Since the charging signal output from the charging control unit 6 is input to the charging power unit 8 through the output interface 7, the charging power unit 8 uses the main battery 9 for 20A according to the input charging signal. Charged at a constant current of (S130).

The charging control unit 6 determines whether the time elapses after the initial main battery 9 starts to be charged (S140), and when the charging time elapses for 1 minute, the voltage of the main battery 9 after 1 minute of charging (Vb: t = 60) is measured (S150).

In the above, the charging control unit 6 measures the voltage of the main battery 9 after one minute of charging, and then the voltage (Vb: t = 0) of the main battery 9 before charging in order to detect an overdischarge state of the battery. The rising width (ΔVb) of the voltage (Vb: t = 60) after 1 minute of charging is calculated (S160).

Subtract the voltage before charging (Vb: t = 0) from the voltage (Vb: t = 60) of the main battery 9 measured 1 minute after charging to obtain the rising width (ΔVb), and then to detect an over-discharge state. It is determined whether or not the first set voltage (0.1 × N, N: number of batteries mounted in the vehicle and connected in series) is equal to or greater (S170).

When the measured voltage rise ΔVb is greater than or equal to the set voltage, it is determined that the battery is in the overdischarge state, the variable value for checking the overdischarge state is increased, and then the charging operation of the main battery 9 is performed.

When the measured voltage rise ΔVb is smaller than the set voltage, it is determined that it is not in an overdischarge state and the charging operation of the main battery 9 is performed.

The method of charging the battery includes the above-described constant current, constant voltage, and multi-stage method, and in the embodiment of the present invention, the 80% charging method, the three-stage constant current charging method, and the constant current / constant voltage so that the discharge amount is 80% of the rated capacity A constant current charging method is used, in which the first step of charging is performed in the same manner.

After detecting the over-discharge state of the main battery 9, the charging control unit 6 charges the main battery 9 with a constant current of 0.2C to perform the first step of charging (S190).

After performing the first stage charging operation on the main battery 9, the charging control unit 6 measures the temperature of the main battery 9 to determine whether the first stage charging is completed. The battery temperature sensor 1 measures the temperature of the main battery 9 and outputs an electrical signal corresponding thereto.

In the above, the charging controller 6 sets three points Tb1, Tb2, and Tb3 by measuring the temperature of the main battery 9 three times, and then determines the maximum value of the measured three points Tb1, Tb2, and Tb3. (S200 to S210).

It is determined whether the detected maximum temperature of the three points of the main battery 9 measured above is equal to or higher than the charging limit temperature Tc for detecting the full charge state (S220). When the measured maximum temperature of the main battery 9 is equal to or higher than the charging limit temperature Tc, it is determined that the battery is in a fully charged state and the charging is terminated, and the current charging termination method exceeds the charging limit temperature through the information display unit 11. To indicate that the charging is completed TCO method (S290 ~ S300).

If the measured maximum temperature of the main battery 9 is not equal to or higher than the charging limit temperature Tc, the current voltage of the main battery 9 is measured, and then it is determined whether or not the gas generating voltage (1.430 × N) or more ( S230-250).

In the above, the charging controller 6 determines that the voltage and the specific gravity of the main battery 9 gradually increase and the internal gas is generated even when the measured main battery 9 has a voltage equal to or greater than the first gas generation voltage. In operation S260, the gas generating lamp of the information display unit 11 is turned on to indicate that gas is generated in the main battery 9.

The information display unit 11 which displays the charging state, the charging method and the charging termination method of the main battery 9 according to the embodiment of the present invention is configured as follows.

When the voltage of the main battery 9 measured above is smaller than the gas generation voltage, it is determined that the first stage constant current charging is not completed, and the first stage lamp of the information display unit 11 is turned on to indicate that the current charging stage is one stage. After displaying (S270), the main battery 9 is continuously charged (S190).

In the above, the charging control unit 6 determines whether the gas of the main battery 9 is generated according to the charging operation, and then, in order to determine whether the first stage charging is completed, the voltage of the currently detected main battery 9 and the first stage charging are completed. The relationship with the voltage (1.450 x N) is determined (S280).

When the voltage of the main battery 9 sensed above is less than the first stage charging completion voltage, the first stage charging operation is continuously performed, and when the voltage of the main battery 9 is greater than the first stage charging completion voltage, all charging methods are performed. In step S310, it is determined that the first stage flooring, which is a common stage, is completed and the currently set charging mode is determined (S310).

Determines the charging method set by the user among the 80% charging method, the three-step constant current charging method, and the constant current / constant voltage / constant current charging method according to an embodiment of the present invention, and performs a two-step charging operation according to the set charging method. .

When the charging method set above is the 80% charging method, the charging operation is performed according to the routine shown in FIG. 4B.

When the 80% charging method is selected and the first stage charging is completed, the charging control unit 6 detects the ambient temperature Ts of the main battery 9 (S320). The relationship between the measured ambient temperature Ts of the main battery 9 and the set temperature (about 20 ° C.) for compensating the charge amount due to the difference in battery voltage according to the ambient temperature during charging is determined (S330).

If the measured ambient temperature Ts of the main battery 9 is smaller than the set temperature, the voltage level is formed higher than the charge amount, and thus the constant current charging is performed again to compensate for the charging loss according to the ambient temperature and the charging efficiency. Next, when the temperature is lower than the set temperature, the set variable value ATCT1 and the set time X1 are compared and judged in order to count the time before replenishment (S340 to S360).

In the above, the charging control unit 6 ends charging when the set variable value ATCT1 exceeds the set time X1 and the replenishment time for compensating the charging loss according to the ambient temperature has elapsed. The charging end lamp of (11) is driven to display the charging end state (S370 to S380).

When the measured ambient temperature Ts of the main battery 9 is equal to or higher than the set temperature, constant current charging is performed again to compensate for the charging loss according to the ambient temperature and the charging efficiency, and then, when the temperature exceeds the set temperature, The set variable value ATCT2 is compared with the set time X2 in order to count the values (S390 to S410).

In the above, the charging control unit 6 terminates charging when the supplementary charging time for compensating the charging loss and the charging loss according to the ambient temperature has elapsed after the set variable value ATCT2 is greater than or equal to the set time X2. The charging end lamp of (11) is turned on to display the charging end state (S370 to S380).

When the charging method set above is the constant current / constant voltage / constant current charging method, the charging operation is performed according to the routine shown in FIG. 4C.

In the above-described charging, the battery voltage reaches 1.450 × N voltage to perform constant current one-stage charging, and then the charging control unit 6 performs 1.45 × N V constant voltage charging.

After charging at the constant voltage of 1.450 × NV, the charging control unit 6 measures the temperature of the main battery 9 three times to set three points Tb1, Tb2, and Tb3 to determine whether the charging is completed. Next, the maximum value of the measured three points (Tb1, Tb2, Tb3) is set and compared with the charging limit temperature (Tc) (S430 to S450).

When the measured maximum temperature of the main battery 9 is equal to or higher than the charging limit temperature Tc, it is determined that the battery is in a fully charged state and the charging is terminated, and the current charging termination method exceeds the charging limit temperature through the information display unit 11. To indicate that the charging is completed TCO method (S290 ~ S300).

When the measured maximum temperature of the main battery 9 is lower than the charging limit temperature Tc, the charging current Ic of the main battery 9 according to the constant voltage charging is measured, and then the current charging current is transferred to the next charging step. It is determined whether or not the setting current (0.05C to 0.1C: 5A to 10A) region for switching has been reached (S460 to S470).

In the above, when the charging current according to the constant voltage charging does not reach the set current region, the charging control unit 6 continuously performs constant voltage charging, and is currently performing the first and second stage charging through the information display unit 11. (S480)

When the charging current according to the constant voltage charging reaches the set current region, the process proceeds to the next charging step and performs constant current charging with the set current (S490). After performing the three-step constant current charging, the maximum temperature Tb of the main battery 9 is sensed in order to detect the full charge state and compared with the charging limit temperature Tc (S490 to S520).

When the maximum temperature of the main battery 9 detected above is the charge limit temperature Tc or more, the charging is terminated and the current charge end state is displayed (S290 to S300), and the battery is lower than the charge limit temperature Tc. Detects the ambient temperature (S530).

In the above, the charging control unit 6 obtains the value? T obtained by subtracting the ambient temperature Ts from the detected maximum temperature Tb of the main battery 9, and then the routine shown in FIG. As a result, the relationship between the calculated value? T and the set temperature? Tc is determined (S690).

When the calculated value ΔT is equal to or higher than the set temperature ΔTc, charging is terminated (S290 to S300), and when the calculated value ΔT is lower than the set temperature ΔTc, the main battery 9 The relationship with the charging limit voltage (1.5 × N) is determined by measuring the current voltage of (S700 to S710).

When the voltage of the main battery 9 detected according to the constant current / constant voltage / constant current charge is equal to or greater than the charge limit voltage (1.5 × N), the charging is terminated, and the current charging termination method of the information display unit 11 is set to the voltage limit. VCO (Voltage Cut Off) lamp indicating that the system is turned on and displayed (S720 to S730).

When the voltage of the main battery 9 detected according to the constant current / constant voltage / constant current charging is smaller than the charge limit voltage (1.5 × N), the setting variable ST for calculating the sampling time is increased, and then the setting is performed. It is determined whether or not the sampling time coincides with the sampling time (about 300 sec) (S740 to S750).

In the case where the measured sampling time and the set sampling time do not coincide with each other, the charging control unit 6 indicates that the first, second, and third stages of charging are currently performed through the information display unit 11 (S760). The constant current charging step (S490) is performed.

In the above, when the sampling time measured and the set sampling time coincide with each other, the charging controller 6 of the main battery 9 measured during the current sampling time from the voltage Vi-1 of the main battery 9 measured in the previous step. The voltage Vbi is subtracted to determine whether the voltage drops.

The charging control unit 6 is sampled with the voltage of the main battery measured in the previous step in order to detect the voltage drop caused by the generation and recombination of the internal gas after the maximum cell voltage in the full charge zone during constant current charging If the measured voltage difference is greater than 0 V, it is determined that a voltage drop has occurred, and the charging of the main battery 9 is terminated and the lamp indicating that the current termination control method is the voltage drop method is turned on through the information display unit 11. Mark it to (S790-S800).

In the case where the difference between the voltage of the main battery measured in the previous step and the measured and measured voltage is not more than 0 V, the voltage drop value may not be detected in response to the surrounding variables during constant current charging, and thus the calculation may be performed. When the voltage difference value is 0V, the voltage drop detection time variable FL is set in order to prevent continuous charging during full charge (S810 and S840).

In the above, the charging control unit 11 determines whether the measured voltage drop detection time has passed the set time (about 2 sec) (S850), and when the voltage drop is not detected for a predetermined time in the full charge zone, the surrounding variable at the time of full charge. It is determined that the voltage drop is not detected by the controller, and the charging of the main battery 9 is terminated, and the charging end control method applied through the information display unit 11 indicates that the flat time limiting method is terminated (S860 to S880). .

When the calculated voltage difference is not 0 V, the charging control unit 11 determines that the charge is not a full charge zone, and resets the variable for measuring the sampling time, and resets the voltage value measured during the sampling time. It is set to the previous voltage value (S810 to S830), and the information display unit 11 indicates that the first, second, and third stages of charging of the main battery 9 are continuously performed (S760), and then the constant current charging is performed again. Step S490 is performed.

When the current charging method set in step S310 is a three-step constant current charging method, the charging operation is performed according to the routine shown in FIG. 4D.

After completing the one-step constant current charging described above, two-step constant current charging is started as shown in FIG. 4D. The charging control unit 11 charges the main battery 9 with a constant current of 0.1C (10A), detects the temperature of the main battery 9 at three points, measures a maximum value, and then measures the measured main battery ( The full charge state is detected as described above according to the relationship between the maximum temperature of 9) and the charge limit temperature Tc (S550 to SS580).

When the maximum temperature of the main battery 9 measured above is the charging limit temperature Tc or more, the charging is terminated and the charging end method is displayed (S290 to S300), and the maximum temperature is lower than the charging limit temperature Tc. Next, the voltage of the main battery 9 is measured to determine the relationship with the set voltage (1.5 × N) corresponding to the completion of the two-stage charging (S570 to S580).

When the measured charging voltage of the main battery 9 is smaller than the set voltage (1.5 × N), the display unit 11 indicates that the first and second stages of charging are being performed (S610). 0.2C constant current charging is performed (S550).

When the measured charging voltage of the main battery 9 is equal to or higher than the set voltage (1.5 × N), the controller 3 proceeds to three-step constant current charging to charge the main battery 9 with 0.05C (about 5A) constant current (S630).

In order to determine whether the battery is fully charged after performing the three-stage constant current charging, the temperature of the main battery 9 is measured (S650), and when the maximum temperature is equal to or higher than the charging limit temperature Tc, the charging is terminated ( S290 to S300, when the measured maximum temperature is lower than the charge limit temperature Tc, the ambient temperature Ts of the main battery 9 is measured to measure the maximum temperature and the ambient temperature ( The difference temperature ΔTi value from Ts) is calculated (S670 to S680).

The difference temperature ΔTi value between the maximum temperature of the main battery 9 and the ambient temperature Ts measured above is calculated, and then the main battery 9 is again in accordance with the routine shown in FIG. Determine whether it is fully charged.

The charging control unit 9, like the above-described operation for determining whether the main battery 9 is fully charged in the constant current / constant voltage / constant current charging method, the voltage drop method that is the charging end method of the constant current charging method, and the flat time limiting According to the method, the full charge state of the main battery 9 according to the three-step constant current charging is sensed.

When the voltage drop does not occur by determining whether the voltage drops in the three-step constant current charging method, it indicates that the current charging is continuously performed (S710 to S770), and performs the three-step constant current charging operation (S630).

As described above, in the case of charging the battery of the vehicle, that is, the battery according to the embodiment of the present invention, all charging completion detection methods that can be performed according to the charging method after charging the battery according to the charging method set by the user The electric vehicle battery having the effect of reducing the consumption rate of the battery due to overcharging and improving the safety by detecting the completion state of the battery according to the charging temperature of the battery, the charging voltage, and the current flowing at the time of charging / discharging It is possible to provide a charging control device and a method thereof.

Claims (22)

Battery temperature sensing means for sensing a temperature of the battery and outputting an electrical signal corresponding thereto; Battery ambient temperature sensing means for sensing an ambient temperature of the battery and outputting an electrical signal corresponding thereto; Battery voltage sensing means for sensing a charging voltage of the battery and outputting an electrical signal corresponding thereto; Current sensing means for measuring a current during charging / discharging of the battery and outputting an electrical signal corresponding thereto; A charge mode setting switch configured to set an 80% charging method, a three-stage charging method, and a constant current / constant voltage / constant current charging method of the battery; When the power is applied, it detects the over-discharge state of the battery, outputs the 1-step constant current charge signal, which is a common step of all current charging methods, detects the 1-level full charge state according to the charge limit temperature method, and then sets the charge set by the user. If the set charging method is 80% charging method, the compensation charging signal is output according to the charging ambient temperature and charging efficiency.If the set charging method is the three-step constant current charging method, the two-step constant current charging signal is output. After detecting the two-stage full charge state according to the charge limit temperature method, it outputs the three-stage constant current charge signal again, and detects the full charge state according to the charge limit temperature method, the voltage limit method, and the voltage drop detection method. In case of the constant current / constant voltage / constant current method, it outputs a two-stage constant voltage charge signal and charge limit is on. After detecting the two-stage full charge state according to the method, and performing the three-stage constant current charging, and then detecting the full charge state according to all the charge termination control methods described above, the full charge state of the battery is Charge control means for outputting a charge end signal when detected; And a battery charging means for performing a charging operation of the battery according to the signal output from the charging control means. The apparatus of claim 1, further comprising information display means for displaying a current charging state of the battery, a set charging method, and a charging end control method. The method of claim 1, wherein the charge control means measures the initial battery voltage in detecting an over-discharge state of the battery, and then outputs a signal for charging the battery at a constant current of 0.2 C (20 A), and after a predetermined time. After measuring the battery voltage, calculate the battery voltage difference after the initial measured battery voltage and a certain time after charging, if the calculated voltage difference is more than the set voltage (0.1 × N, N: the number of batteries installed) over-discharge A battery charge control device for an electric vehicle, characterized in that it is determined to be in a state. The method of claim 1, wherein the charge control means outputs a signal for charging the battery with a constant current of 0.2C in the case of performing the first-stage constant current charging, and then the full charge state is changed according to the charge limit temperature method. If not detected, the current voltage of the battery is measured and compared with the set voltage (1.430 × N), and if the measured battery voltage is lower than the set voltage, the current charging step is performed in one step while continuously outputting a one-step charging signal. Outputs an information signal to indicate that the battery is at a predetermined voltage or higher, and determines that gas has been generated inside the battery, and outputs a gas generation display signal, and compares it with the first-level maximum charging voltage (1.450 × N). When the battery voltage measured and determined is equal to or greater than the maximum charge voltage of one stage, the first stage of charging may be determined to be completed. For an electric vehicle battery charge control apparatus. The method of claim 1, wherein the charging control means is measured by measuring the ambient temperature of the battery in order to compensate for the charge loss according to the ambient temperature and charging efficiency during charging when the set charging method is 80% charging method If the battery ambient temperature is lower than the set temperature, the signal for performing recharge with a constant current of 0.2C is output again for the first set time, and again for the second set time if the measured battery ambient temperature is over the set temperature. A battery charge control device for an electric vehicle, characterized in that for outputting a signal for performing replenishment with a constant current of 0.2C, and then terminating charging and outputting a signal for indicating that the charging is finished. The method of claim 1, wherein the charging control means outputs a two-stage charging signal with a constant current of 0.1C when the set charging method is a three-stage constant current charging method, and then charges one full stage according to the charging limiting method. If the state is not fully charged and the charge voltage of the current battery is measured, and the measured charge voltage is smaller than the two-step maximum charging voltage (1.4 V × N), the controller continuously outputs the two-stage charge signal. Outputs a signal to indicate that the battery is currently performing two-stage charging, and if the measured charging voltage is greater than the two-stage charging voltage, it is determined that the two-stage charging is completed, and to perform three-stage charging with a constant current of 0.05C. Outputs the signal and judges three levels of full charge status according to the charge limit method, voltage limit method, voltage drop detection method and flat time limiting method. When the end of charging, and the charged battery for an electric vehicle, characterized in that for outputting a signal for displaying a charge-control method using end restrictor detected. The charging control means according to claim 1, wherein the charging control means outputs a signal for charging the battery at a constant voltage of 1.45 x NV when the set charging method is a constant current / constant voltage / constant current charging method, and according to the charge limit temperature method. Determine the full charge state, measure the charge current when the full charge state is not detected, and determine that the constant voltage charge is completed when the measured charge current corresponds to the limit current value at the constant voltage charge, and then the constant current Outputs a signal to perform constant current charging, and then determines the full charge state according to the charge limit temperature method, the voltage limit method, the voltage drop detection method, and the flat time limiting method. And outputting a signal for indicating a charging end limiting method used. Limiting device. The method according to any one of claims 4 to 7, wherein the charge control means, in a charge limit temperature method for detecting a full charge state, measures a plurality of temperatures of a battery, and then measures the measured plurality of battery temperatures. Detects the maximum temperature and determines the relationship between the detected maximum temperature and the charging limit temperature set according to the manufacture of the battery, and outputs a charging end signal when the maximum temperature of the battery is higher than the charging limit temperature. And a signal for indicating that the charging temperature limiting system is output. The charging control means according to claim 6 or 7, wherein the charging control means detects the charging voltage of the battery when the voltage limiting method is used when the full charge state of the battery is not detected according to the charging limiting temperature method. Determining the relationship with the charging limit voltage to output a charging end signal when the measured charging voltage is equal to or greater than the charging limit voltage, and then outputting a signal indicating that the currently used charging limiting method is a voltage limiting method. Charge control device for electric vehicles. The method according to claim 6 or 7, wherein the charge control means described above uses a voltage drop detection method when a full charge state of the battery is not detected according to the voltage limiting method. When the limiting method is performed, the voltage difference between the measured charging voltage of the battery and the measured charging voltage after a predetermined time is calculated, and when the calculated voltage difference is more than 0 V, a signal for terminating the charging is output, and then the current use is performed. And a signal for indicating that the charged charge limiting method is a voltage drop detection method. The voltage drop detection method according to claim 6 or 7, wherein the charge control means uses the flat time limiting method when the full charge state of the battery is not detected according to the voltage drop detection method. If the measured voltage difference does not occur during the charging time limit and maintains a constant voltage, it outputs a signal for terminating charging, and then outputs a signal to indicate that the currently used charging limit method is a flat time limiting method. Charge control device for an electric vehicle, characterized in that. Initializing all the usage variables when power is applied, and detecting a battery overdischarge state according to a difference between the initial voltage of the battery and a voltage after a predetermined time of charging; Performing a one-step constant current charging operation, which is a common step of all charging methods, and detecting a one-step full charge state according to the charge limit temperature method; Determining the charging method set by the user when the first step charging is completed; Replenishing the lost amount according to the charging ambient temperature and the charging efficiency when the set charging method is the 80% charging method; When the charging method set above is a three-step constant current charging method, the two-step constant current charging operation is performed, and then, the two-stage full charge state is detected according to the charging limit temperature method, and when the two-step charging ends, the three-step constant current charging operation is performed. Detecting the three-stage full charge state according to the charge limiting temperature method, the voltage limiting method, and the voltage drop detection method, and terminating the three-step constant current charging when the three-step charging ends; When the charging method set above is a constant current / constant voltage / constant current charging method, a two-stage constant voltage charging operation is performed, and then a two-stage full charge state is detected according to the charging limit temperature method. After performing the constant current charging operation, detecting the three-stage full charge state according to the charge limit temperature method, the voltage limit method, and the voltage drop detection method, and terminating the three-stage constant current charging after the three-stage charging is completed. Charge control device of electric vehicle. The method of claim 12, further comprising an information display step of displaying a current charging state of the battery, a set charging method, and a charging end control method. The method of claim 12, wherein in the step of detecting an over-discharge state of the battery, after measuring the initial battery voltage, and outputs a signal for charging the battery with a constant current of 0.2C (20A) and the battery voltage after a predetermined time After the measurement, the battery voltage difference measured after initial charging and the predetermined battery time is calculated, and when the calculated voltage difference differs by more than the set voltage (0.1 × N, N: number of batteries installed), the device is in an over discharge state. Battery charging control method for an electric vehicle characterized in that it determines. The method of claim 12, wherein in the step of performing the above-described one-step constant current charging, a signal for charging the battery with the constant current of one-step 0.2C is output, and then a full charge state is not detected according to the charge limit temperature method. In this case, the current voltage of the battery is measured and compared with the set voltage (1.430 × N), and when the measured battery voltage is smaller than the set voltage, the output of the first stage charging signal is continued, indicating that the current charging stage is one stage. Outputs an information signal, and if the battery voltage is higher than the set voltage, it is determined that gas is generated inside the batterer, and outputs a gas generation indication signal, and compares the result with the maximum charging voltage (1.450 × N) of the first stage. If the measured battery voltage is equal to or greater than the maximum level of the first level of charging, the first step of charging is determined. Method of controlling the battery charge. The method according to claim 12, wherein the set charging method performs the 80% charging method, wherein the battery ambient temperature measured by measuring the ambient temperature of the battery is measured to compensate for the charging loss according to the ambient temperature during charging and charging efficiency. If the temperature is lower than the set temperature, a signal for performing replenishment with a constant current of 0.2 C is output again for the first set time, and if the measured battery ambient temperature is greater than or equal to the set temperature, 0.2 C is again made for the second set time. And outputting a signal for performing replenishment with a constant current and then terminating charging and outputting a signal for indicating that the charging is finished. The method of claim 12, wherein the set charging method performs a three-step constant current charging method, and outputs a two-stage charging signal with a constant current of 0.1 C, and then determines the one-step full charging state according to the charging limiting method. When the battery is not fully charged, the current battery charge is output while the current battery charge is measured while the measured charge voltage of the current battery is smaller than the maximum charge voltage (1.4 V × N). Outputs a signal to indicate that it is performing two-stage, and if the measured charging voltage is more than two-stage charging voltage, it is determined that the two-stage charging is completed, and outputs a signal for performing three-stage charging with a constant current of 0.05C The full charge state is detected by determining the three-level full charge state according to the charge limit method, the voltage limit method, the voltage drop detection method, and the flat time limiting method again. End the surface charge and the charge end control method how signal charge limitation of the electric vehicle battery, characterized in that for outputting for display use. The method of claim 12, wherein the set charging method performs a constant current / constant voltage / constant current charging method, and outputs a signal for charging the battery at a constant voltage of 1.45 × NV and sets the full charge state according to the charge limit temperature method. When the full charge state is not detected, the charging current is measured, and when the measured charging current corresponds to the limit current value at the constant voltage charging, it is determined that the constant voltage charging is completed. After outputting a signal to perform, the full charge state is judged again according to the charge limit temperature method, the voltage limit method, the voltage drop detection method, and the flat time limiting method. Battery charging limit room of an electric vehicle, characterized in that for outputting a signal for indicating the termination limit method . 19. The method according to any one of claims 15 to 18, wherein in the step of performing the charge limit temperature method for detecting the full charge state, a plurality of temperatures of a battery are measured and then a maximum of the plurality of measured battery temperatures is measured. Determining the relationship between the detected maximum temperature and the charge limit temperature set according to the battery manufacturing by detecting the temperature, and outputs a charge end signal when the maximum temperature of the battery is above the charge limit temperature, and the currently used charge end method is charged A battery charging control method for an electric vehicle, characterized in that for outputting a signal for indicating that the temperature limit system. Determining the relationship with the charge limit voltage by sensing the charge voltage of the battery, and outputs a charge end signal when the measured charge voltage is more than the charge limit voltage, and then to indicate that the current charge limit method is a voltage limit method Charging control method for an electric vehicle, characterized in that for outputting a signal. 19. The method of claim 17 or 18, wherein in the step of using the voltage drop detection method when the full charge state of the battery is not detected according to the voltage limiting method, the voltage limiting method is performed after a predetermined time has elapsed. The voltage difference between the measured charging voltage of the battery and the measured charging voltage after a predetermined time is calculated, and when the calculated voltage difference is 0V or more, a signal for terminating charging is output, and the currently used charge limiting method is a voltage. A charging control method for an electric vehicle, characterized in that for outputting a signal for indicating that the drop detection method. 19. The method of claim 17 or 18, wherein in the step of using the flat time limiting method when the full charge state of the battery is not detected according to the voltage drop detection method, the voltage difference measured according to the voltage drop detection method is In the case of maintaining a constant voltage without occurring during the charging time limit, outputting a signal for terminating the charging, and then outputs a signal to indicate that the currently used charge limiting method is a flat time limiting method How to control the charging of the car.