JP3326250B2 - Battery charger for electric vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery charging device for an electric vehicle, and more particularly to an electric vehicle battery charging device in which charging at night is completed immediately before traveling to increase the temperature of the battery fluid and extend the traveling distance per charge in winter. The present invention relates to a battery charger.

[0002]

2. Description of the Related Art An electric vehicle has a short traveling distance per charge, particularly in winter, especially when the battery temperature is lowered due to a decrease in the temperature of the battery. The capacity of the battery is reduced, and the battery is shortened by repeating deep discharge.

It is known that the performance of a battery can be improved in winter by raising the temperature of the battery. Therefore, as a method of raising the battery temperature,
A method of heating by attaching an electric heater to the side surface of the battery or a method of heating by generating an Joule heat by applying an alternating current can be considered, but these methods have problems in practicality, durability, and cost.

[0004] Therefore, there has been proposed a battery charging device for an electric vehicle, in which charging at night is completed immediately before traveling to raise the temperature of the battery fluid and extend one charge traveling distance in winter.

FIG. 3 is a circuit diagram showing a conventional battery charger for an electric vehicle disclosed in Japanese Utility Model Laid-Open No. 55-4691.

In FIG. 3, power supply terminals 2 and 3 of a charger 1 are shown.
Is connected to the power supply 6 via the output contact 5 of the timer 4
It is connected to the. The timer 4 is for setting a charging completion time, and the output contact 5 closes at the start of the time limit and opens when the time limit is completed and the set time comes. Furthermore, the timer 4 is connected to the power supply 6 via an output contact 8 of a second timer 7 connected in parallel to the power supply 6. Output contacts 9 and 10 of charger 1
Is connected to a battery 11.

Next, the operation will be described.

A timer 4 for charging the battery 11
And the second timer 7 sets the time limit start time of the timer 4. In this case, the charging time is 10
If the time and the start time of using the electric car is 8:00 in the morning,
The time limit of the timer 4 is set to 10 hours, and the time at which the second timer 7 operates and the output contact 8 is closed, that is, the charging start time is set to 10:00 of the previous night.

[0009] With this setting, at 8:00 am when the electric vehicle starts running, it is immediately after the charging is completed. Therefore, the liquid temperature of the battery 11 is in a high temperature state, and sufficient discharge can be performed even in winter. You can do it.

[0010] However, when the electric vehicle is used for work such as delivery, the use start time of the electric vehicle is almost the same every day. Therefore, the electric vehicle has a memory function for storing the setting data when the previous timer was set. The present applicant has devised a battery charger for an electric vehicle. As a result, it is possible to save the trouble of setting the time limit setting (charging time) and the charging start time every day by using the previous setting data as it is.

[0011]

However, in the above-described battery charging device for an electric vehicle having a memory function, if the user has a habit of charging the battery without changing the settings, the battery may be charged on the next day such as a holiday. In addition, if the setting data of the previous day was different from usual, it is easy to inadvertently forget to change the setting, charging it with the previous day's data and charging the battery when trying to use an electric car May be insufficient, or charging may not be performed at all.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problem, and compares the setting data of the timer two times before and the previous setting data. It is an object of the present invention to provide a battery charger for an electric vehicle that can be used.

[0013]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an electric vehicle battery charging apparatus according to the present invention has a timer for setting a battery charging completion time and a timer setting data. Storage means for storing the setting data of the last two times stored in the storage means and the previous setting data, and, when performing the timer setting, the setting data of the last two times and the previous setting data compared by the comparing means when performing the timer setting And a warning means for issuing a warning when the numbers are different from each other.

[0014]

According to the above construction, the battery charging device for an electric vehicle according to the present invention stores the setting data of the timer by the storage means, and compares the setting data of the last two times stored in the storage means with the previous setting data by the comparing means. When comparing and setting the charging completion time of the battery in the timer, a warning is issued by the warning unit when the setting data before and after the comparison by the comparing unit is different from the previous setting data.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1A is a block diagram showing a battery charger for an electric vehicle according to one embodiment of the present invention, and FIG. 1B is a block diagram of the electric vehicle battery shown in FIG. FIG. 3 is a block diagram showing an operation unit of the battery charger.

The battery charger for an electric vehicle has a charger 1 for charging the battery 11 from an external power supply 6, and the charger 1 includes a system check such as a state of the battery 11 and a voltage of the power supply. Is connected. The operation unit 13 is connected to the charge controller 12.

The operation unit 13 has an input / output unit 14 connected to the charge controller 12. This input / output unit 14
Is connected to a CPU 15 that controls each unit. C
The PU 15 stores a timer 16 for setting the charging completion time of the battery 11, a memory 17 as a storage unit for storing the setting data of the timer 16, A comparator 18 as comparison means for comparison is built in. The CPU 15 has a setting switch 20 for inputting the next battery use time and the like, and a mode for the CPU 15, for example, switching between a state of inputting the set time and a time measuring state for starting charging. A mode switch 21, a display 19 for displaying the content of the signal sent to the CPU 15 by the setting switch 20 and the mode switch 21, and a timer setting.
Warning means 2 for issuing a warning when the setting data obtained two times before the comparison by the comparator 18 is different from the previous setting data
2 are connected.

Next, the charging device according to the present embodiment will be described with reference to the flowchart of FIG.

When charging the battery 11 of the electric vehicle, the operator connects the external power supply 6 to the charger 1 and presses a power on / off button (not shown) of the operation unit 13 provided in the vehicle to generate a display signal. input. (Step S1). Then, the CPU 15 detects an input from the power on / off button and displays the previous set time stored in the memory 17 on the display 19 (step S2). At this time, the comparator 18 compares the last set data stored in the memory 17 with the previous set data (Step S).
3) If the setting data of the last time is different from the setting data of the previous time, the CPU 15 outputs the warning means 22 such as a buzzer.
, A warning is issued, and the fact that the setting data of the last two times is different from the previous setting data is displayed on the display 19 (step 4). When the setting data of the last two times is the same as the setting data of the previous time, the CPU 15 does not perform any special operation.

When detecting that the power on / off button has been turned on, the CPU 15 transmits a start signal to the charge controller 12 via the input / output unit 14. Then, the charge controller 12 is started up, and after checking the system (installation of the connector, state of the charger, voltage of the power supply, and the like), a signal indicating whether the system is normal is returned. Upon receiving this reply signal, the CPU 15 turns on a normal lamp or an abnormal lamp (not shown). If the return signal is a signal indicating an abnormality, the CPU 15 does not accept an input of a switch other than the power on / off button.

On the other hand, if the reply signal is a signal indicating normality, the input of the set time is accepted and displayed (step S5). For example, assuming that the time is to be set at 8 o'clock, when the increase / decrease button of the setting switch 20 is pressed with respect to the current time (for example, 7 o'clock), the CPU 15 reads the time and adds the increased time to the display 19. Is displayed (step S5). The display is 7:00 ... 7:
30 ... 8:00. Further, the CPU 15
Sets the previous setting data stored in the memory 17 as data of the last two times and the current setting data as previous data (step S6). Then, when the operator presses a start button (not shown), the CPU 15 receives the signal and starts measuring time (step S7).

The CPU 15 transmits a stop signal to the charge controller 12 until the charge start time comes,
The charge controller 12 has stopped functioning and is in a standby state. Then, the CPU 15 calculates the time that is calculated by calculating backward from the set time, that is, the time required to start charging, that is, the time to start charging, and sets the calculated time in the timer 16. Here, about 8 hours is appropriate as the time required for charging. Then, the time is measured until the charging start time comes, and the display on the display 19 is changed accordingly.

When it is time to start charging (step S8), the CPU 15 transmits a start signal to the charge controller 12, and the charge controller 12 that has received the start signal starts. Further, the CPU 15 transmits a start signal (step S9), and the charge controller 12, which has received the start signal, first performs full discharge of the battery 11, and thereafter starts charging the battery 11 by the charger 1. Note that the entire discharge of the battery 11 is performed to prevent the capacity of the battery 11 from decreasing.

At this time, the CPU 15 calculates an optimum charging current and voltage from the voltage, current, temperature, charging integration time and the like of the battery 11 and controls the charger 1 via the charging controller 12 until the charging completion time. Note that the charge controller 12 outputs a signal according to a state such as during charging, charging end, charging abnormality, and the like, and the CPU 15 turns on a lamp according to the state or displays it on the display 19.

In the step S4, when the setting data of the last time and the previous setting data are different, when the confirmation switch (not shown) is turned on (step S10), the operation from the step S6 is performed. If the confirmation switch is not turned on, the operation after step S5 is performed.

[0027]

As described above, according to the present invention, the setting data of the timer is stored in the storage means, and the setting data of the last time stored in the storage means and the previous setting data are compared by the comparing means. When the battery charging completion time is set in the timer, a warning is issued by the warning unit when the setting data of the last two times compared by the comparing unit and the previous setting data are different from each other. If the setting data is different from usual,
It is possible to prevent the user from forgetting to change the setting and prevent the battery from being insufficiently charged or not being charged at all when the electric vehicle is used.

[Brief description of the drawings]

FIG. 1A is a block diagram illustrating a battery charger for an electric vehicle according to the present invention, and FIG. 1B is a block diagram illustrating an operation unit of the battery charger for an electric vehicle according to the present invention. It is.

FIG. 2 is a flowchart showing the operation of the present invention.

FIG. 3 is a circuit diagram showing a conventional battery charger for an electric vehicle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Charger 11 Battery 12 Charge controller 13 Operation part 14 Input / output part 15 CPU 16 Timer 17 Memory 18 Comparator 19 Indicator 20 Setting switch 21 Mode switch 22 Warning means

Continuation of front page (56) References JP-A-3-173321 (JP, A) JP-A-2-280633 (JP, A) JP-A-6-30532 (JP, A) JP-A-3-15232 (JP) , A) Japanese Utility Model 5-25950 (JP, U) Japanese Utility Model 3 104046 (JP, U) Japanese Utility Model 55-4691 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB Name) H02J 7/00-7/10 B60L 11/18

Claims (1)

(57) [Claims] 1. An electric vehicle battery charging apparatus comprising a timer for setting a charging completion time of a battery, a storage means for storing setting data of a timer, and setting data of the last two times and previous setting data stored in the storage means. And a warning unit that issues a warning when the setting data compared before and after the setting data compared by the comparing unit is different from the previous setting data when performing the timer setting. Battery charger for car battery.