JP4318184B2 - Electric vehicle charging device - Google Patents

Electric vehicle charging device Download PDF

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Publication number
JP4318184B2
JP4318184B2 JP2005249174A JP2005249174A JP4318184B2 JP 4318184 B2 JP4318184 B2 JP 4318184B2 JP 2005249174 A JP2005249174 A JP 2005249174A JP 2005249174 A JP2005249174 A JP 2005249174A JP 4318184 B2 JP4318184 B2 JP 4318184B2
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battery
charging
vehicle
electric vehicle
electric
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JP2007068285A (en
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淳 米花
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本田技研工業株式会社
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Description

  The present invention relates to a charging device for an electric vehicle, and more particularly, to a charging device for an electric vehicle that can reduce the size of a temperature fuse built in an in-vehicle battery.

  2. Description of the Related Art Conventionally, an electric vehicle that travels by converting a DC power source of a vehicle-mounted battery into AC power by a power converter and driving an AC motor is known. For charging the battery of such an electric vehicle, it is preferable that a commercial AC power source distributed to a general household can be used from the viewpoint of convenience. However, in order to charge the in-vehicle battery from the AC power source, a power converter that converts the AC power source into DC power is required, and there is a problem that weight and installation space increase when this is mounted on a vehicle.

  Patent Document 1 discloses an electric vehicle in which a commercial AC power source can be used for charging an in-vehicle battery by providing a power converter with a bidirectional power conversion function. This electric vehicle is configured to be capable of step-up charging to an in-vehicle battery while using a winding of an AC motor for driving as a reactor necessary for step-up chopper control, eliminating the need for a dedicated charging device. ing.

Further, a normal vehicle battery is provided with a temperature fuse for forcibly stopping charging when the temperature of the battery abnormally rises, as in the battery pack disclosed in Patent Document 2. Since this thermal fuse is a mechanism that cuts an electric circuit by being blown by the heat of the battery, it is known that the thermal fuse is installed in contact with the battery, and the one having a larger capacity is used as the battery voltage is higher. ing.
JP-A-5-207664 JP 2000-195567 A

  However, when a temperature fuse as disclosed in Patent Document 2 is to be installed in an in-vehicle battery of an electric vehicle disclosed in Patent Document 1, if a portion to which a voltage after boosting is applied is selected as this installation position, In order to increase the capacity of the fuse, it is necessary to take a measure such as raising the rating, and there is a problem that the size of the entire apparatus is increased.

  An object of the present invention is to solve the above-described problems of the prior art and to provide a charging device for an electric vehicle capable of downsizing a temperature fuse of a vehicle-mounted battery.

  In order to achieve the above-described object, the present invention provides an electric motor for driving a vehicle, a battery charged with electric power supplied from an external power source, and direct current power supplied from the battery is converted into alternating current power. In a charging device for an electric vehicle including a driver for driving and controlling a switching element so as to control the operation of the electric motor, the boosting unit charges the battery by boosting the power supplied from the external power source to the charging voltage of the battery. And a thermal fuse that disconnects an electric circuit that supplies electric power to the battery when the temperature of the battery reaches a predetermined value or more, and the thermal fuse is disposed on the electric circuit in the arrangement of the external power source. The first feature is that it is provided between the voltage booster and the booster.

  The boosting means has a second feature in that it is configured using a switching element that is driven and controlled by the driver and a stator coil of the electric motor.

  Furthermore, the third feature is that the external power source is an adapter that converts commercial AC power into DC power having a voltage lower than the charging voltage of the battery.

  According to the first aspect of the present invention, since the thermal fuse having a small capacity with respect to the battery voltage can be used, the size and weight of the thermal fuse can be suppressed, and the battery or the like can be miniaturized.

  According to the invention of claim 2, since the boosting process can be performed by using the switching element and the stator coil originally mounted on the vehicle, it is not necessary to newly provide a charging device or the like, and the vehicle can be enlarged. Will be able to prevent.

  According to the invention of claim 3, since the voltage of the DC power flowing through the connection portion with the vehicle is lower than the battery charging voltage, it is possible to reduce the influence when the current leaks.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a scooter type electric motorcycle to which a charging device for an electric vehicle according to the present invention is applied. A vehicle body frame 1 formed by processing a highly rigid metal member is bent rearward at a head pipe 10, a front frame 11 extending downwardly from the head pipe 10, and a lower end portion of the front frame 11. The intermediate frame 12 is configured to extend substantially horizontally, and the rear frame 13 is inserted through the rear end portion of the intermediate frame 12 and extends rearward. A battery pack 30 is accommodated in the intermediate frame 12 and the front frame 11, and an upper portion of the intermediate frame 12 is covered with a step floor 14.

  A steering unit 2 is supported on the head pipe 10 so as to be steerable. The steering unit 2 includes a stem shaft 2a that is rotatably supported by the head pipe 10, and a handle pipe 2c that is connected to an upper end portion of the stem shaft 2a via a handle stay 2b. The handle stay 2b is provided with a headlamp 3 at its tip and a horn 6 below. A pair of left and right front forks 4 are connected to the lower portion of the stem shaft 2a, and a front wheel FW is pivotally supported at the lower end thereof.

  The rear frame 13 includes a frame main body 13a and a frame pipe 13b inserted through the frame main body 13a. A seat stay 5 and a rear combination stay 7 are connected to the exposed portion of the frame pipe 13b. A rear end portion of the rear combination stay 7 is provided with a combination lamp 15 in which a brake lamp and a winker lamp are integrally arranged, and a number plate holder 16 is provided therebelow.

  The seat stay 5 is fixed to a seat post 5a, a fastener 5b for fastening the seat post 5a to the rear frame pipe 13b, and an upper portion of the seat post 5a by a connecting stay 5c and extends rearward. It is comprised from the helmet holder 5d. On the upper part of the seat stay 5, there is disposed a seating seat 8 that can be opened and closed with the support portion 21 at the rear end of the helmet holder 5d as an axis. Inside the connecting stay 5 c, a plug 22 for charging the battery pack 30 is accommodated together with a cord 23. Further, the helmet 9 is stored inside the helmet holder 5d in an inverted posture.

  A swing unit 17 that incorporates an AC motor as an electric motor and drives the rear wheel RW is connected to and supported by a rear end portion of the intermediate frame 12 via a link member 24 so as to be swingable. The upper part of the swing unit 17 is connected to the upper part of the rear frame body 13a via the rear cushion 18.

  FIG. 2 is an explanatory perspective view of the battery pack 30. The battery pack 30 is composed of a plurality of battery cells 31 that are stacked in two stages so that the cross-sectional shape in the longitudinal direction is a substantially parallelogram. When mounted on the vehicle, a shrink pack and a resin exterior cover (not shown) made of a heat shrink film are applied to the outside. A thermal fuse 32 for forcibly stopping charging when the temperature of the battery pack 30 exceeds a predetermined value and a thermistor 33 as a temperature sensor are disposed in the gap between the battery cells 31. The battery pack 30 in the present embodiment is configured to obtain a voltage of 48 V by connecting the battery cells 31 in series, and the positive and negative power lines are taken out via the connector 34.

  FIG. 3 is a schematic explanatory diagram of a charging device for an electric vehicle according to an embodiment of the present invention. The same reference numerals as those described above denote the same or equivalent parts. The stator coil 26 of the drive AC motor built in the swing unit 17 (see FIG. 1) includes FETs (field effect transistors, generally, constituting a full-wave rectifier 40 in U, V, and W phases thereof. Solid switching elements) 40a, 40b, 40c, 40d, 40e, and 40f are connected to each other. The driver 41 transmits a drive signal to the full-wave rectifier 40 based on a command signal from the CPU 43 that calculates the optimum control state of the AC motor by detecting the throttle opening, the vehicle speed, and the like with various sensors. When the scooter type motorcycle is running, the FETs 40a to 40f of the full-wave rectifier 40 are switching-controlled to convert the DC power source of the battery pack 30 into three-phase AC power, and the AC motor is driven by this AC power. ing.

  For charging the battery pack 30, commercial AC power (usually 100 V or 200 V) is taken in from the outside using the plug 22 and the cord 23. In this embodiment, the AC / DC adapter 25 that is a charger as an external power source is mounted on the vehicle side. However, the AC / DC adapter 25 may be connected only when charging as a separate unit from the vehicle.

  In the present embodiment, the AC / DC adapter 25 is a power converter that converts 100V AC power into 36V DC power. In this case, since the battery pack 30 of 48V cannot be charged with the converted 36V DC power, the boosting process is performed by the boosting means 42 including the full-wave rectifier 40 and the stator coil 26. The step-up chopper control as the step-up process requires a reactor for effectively using the inductive reactance. In the present embodiment, the stator coil 26 of the drive AC motor originally mounted on the vehicle is used as the reactor. By doing so, the boosting process can be executed without using a dedicated charging device.

  When charging the battery pack 30, the FETs 40 a to 40 f are chopped by the drive signal from the driver 41, so that the DC power of 36 V is boosted to 48 V that is the charging voltage of the battery pack 30. Here, the procedure of battery charge control will be described with reference to the flowchart of FIG.

  FIG. 4 is a flowchart showing a procedure of battery charging control. When the plug 22 of the charger (AC / DC adapter 25) is connected to a commercial power outlet in step S10, the process proceeds to step S11. When the CPU 43 recognizes the connection of the charger, the charger is allowed to charge. A signal is output. In the subsequent step S12, the 36V power output from the AC / DC adapter 25 is boosted to 48V by the boosting chop control of the driver 41, and charging of the battery pack 30 is started. In step S13, it is determined whether or not the charging is normally performed by the CPU 43. If it is determined that the charging is normal, the process proceeds to step S14 and the charging is continued. In the following step S15, it is determined whether or not a predetermined voltage for ending charging has been reached. If it is determined that the voltage has not been reached, the process returns to step S14 to continue charging. It progresses to S16 and complete | finishes charge.

  Here, in the flowchart, if it is determined in step S13 that charging is not normal, the process immediately proceeds to step S16 and ends charging. This determination is based on various diagnostic functions of the CPU 43. Has been done by. The thermal fuse 32 is equipped to surely terminate the charging if the CPU 43 does not function normally and the charging is not properly terminated.

  Returning to FIG. 3, the thermal fuse 32 is installed so as to contact the battery cell 31. If the temperature of the battery cell 31 rises beyond the normal value because charging is not normal, The electric circuit is cut off by being melted by the heat. Normally, a rated product that matches the battery voltage is used for such a thermal fuse. However, in the present embodiment, the installation location of the thermal fuse 32 in the electric circuit is between the AC / DC adapter 25 and the boosting means 42, so that the 36V rated voltage is significantly smaller than the battery voltage of 48V. Thermal fuses can be used. As a result, the size and weight of the thermal fuse can be suppressed, so that the battery pack 30 and the like can be miniaturized.

  Moreover, when connecting the vehicle and the external power source for battery charging, there is a possibility that current leaks for some reason. In the charging device for an electric vehicle according to the present invention, conversion is performed by the AC / DC adapter 25. Since the voltage of the DC power to be applied is set to be significantly lower than the battery voltage, it is possible to obtain a charging device for an electric vehicle with little influence even if the current leaks.

1 is a side view of a scooter type electric motorcycle to which a charging device for an electric vehicle according to the present invention is applied. It is a description perspective view of a battery pack. 1 is a schematic explanatory diagram of a charging device for an electric vehicle according to an embodiment of the present invention. It is a flowchart which shows the procedure of battery charge control.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 22 ... Plug, 25 ... AC / DC adapter, 26 ... Stator coil, 30 ... Battery pack, 31 ... Battery cell, 32 ... Thermal fuse, 40 ... Full wave rectifier, 40a-40f ... FET, 41 ... Driver, 43 ... CPU

Claims (5)

  1. An electric motor for driving the vehicle;
    A battery charged with power supplied from an external power source;
    In a charging device for an electric vehicle comprising: a driver that drives and controls a switching element so that the DC power supplied from the battery can be converted into AC power and the operation of the electric motor can be controlled.
    Boosting means for boosting the power supplied from the external power source to the charging voltage of the battery and charging the battery;
    A thermal fuse for cutting an electric circuit for supplying electric power to the battery when the temperature of the battery reaches a predetermined value or more;
    The battery is configured by stacking a plurality of cells,
    The temperature fuse is formed in a cylindrical shape, and is disposed in a gap between a plurality of cylindrical cells constituting the battery, and in an arrangement on an electric circuit, between the external power source and the boosting unit. Provided ,
    The charging device for an electric vehicle, wherein the boosting unit is configured using a switching element that is driven and controlled by the driver and a stator coil of the electric motor.
  2. 2. The charging device for an electric vehicle according to claim 1, wherein the thermal fuse is disposed such that a longitudinal direction of the thermal fuse is along a longitudinal direction of the cell.
  3. Comprising a thermistor for detecting the temperature of the battery;
    The thermistor is formed in a cylindrical shape, and is arranged in a gap between a plurality of cylindrical cells constituting the battery so that the longitudinal direction of the thermistor is along the longitudinal direction of the cells. The charging device for an electric vehicle according to claim 1 or 2.
  4. 4. The charging device for an electric vehicle according to claim 1, wherein the external power source is an adapter that converts commercial AC power into DC power having a voltage lower than a charging voltage of the battery. 5.
  5. 5. The charging device for an electric vehicle according to claim 1, wherein the vehicle is a motorcycle.
JP2005249174A 2005-08-30 2005-08-30 Electric vehicle charging device Expired - Fee Related JP4318184B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2005249174A JP4318184B2 (en) 2005-08-30 2005-08-30 Electric vehicle charging device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005249174A JP4318184B2 (en) 2005-08-30 2005-08-30 Electric vehicle charging device

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JP2007068285A JP2007068285A (en) 2007-03-15
JP4318184B2 true JP4318184B2 (en) 2009-08-19

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102195269A (en) * 2010-03-03 2011-09-21 唐山普林亿威科技有限公司 Vehicle-mounted charger with drive motor function

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102195269A (en) * 2010-03-03 2011-09-21 唐山普林亿威科技有限公司 Vehicle-mounted charger with drive motor function

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