JP2013099119A - Battery charger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery charger with suppressed adverse effects due to heat generation of the battery charger.SOLUTION: A battery charger includes: a body case 10 that has a box shape and in which its top surface area is formed larger than the bottom surface of a battery pack BP to be mounted; a mounting part 20 that is provided on the top surface of the body case 10 and is used for mounting the battery pack BP in a standing position; a circuit board 30 that is embedded in the body case 10 and on which a charging circuit 32 supplying power for charging the battery pack BP mounted on the mounting part 20 is mounted; and a cover part 14 that covers the surface of the body case 10 and has heat insulating properties. The inside of the body case 10 is divided into a battery mounting region in which the mounting part 20 is provided and a circuit arrangement region in which the charging circuit 32 is arranged, and the mounting part 20 is provided at a position eccentric to the center of the body case 10.

Description

  The present invention relates to a charger for charging a battery pack that is detachably set to an electric vehicle such as an electric motorcycle, an assist bicycle, and an electric cart and supplies electric power to a motor that runs the electric vehicle.

  A battery pack that supplies power to a motor that drives an electric vehicle such as an electric motorcycle has a large output or a large number of batteries in order to increase the output, that is, to increase the discharge power supplied to the electric vehicle. Built-in to increase output voltage and output current. This battery pack has a structure in which a connector is provided on the battery pack case so that the battery pack can be detachably set, and the battery pack is discharged to supply electric power. Also, the battery pack is removed from the electric vehicle and set in the charger, and the battery built in the battery pack is charged with the charger.

  An example of a state in which the battery pack is set in the charger is shown in FIG. The charger 100X is constituted by a main body case 10X of a rectangular charger, and has a pack insertion portion for inserting the battery pack BPX in an upright posture on the upper surface thereof.

  Such a charger has a built-in charging circuit for receiving a power supply from the outside and converting it into a voltage suitable for charging the battery pack. This charging circuit is mounted with members such as FETs, diodes, and transformers which are power semiconductor elements, and these generate heat when energized. In particular, when the power consumption is 100 W or more, the amount of heat generated is large, and heat is easily trapped inside the charger. For this reason, at the time of charge, there was a problem that the surface of the main body case was heated by the heat generated by such a heat generating member. When the surface of the main body case becomes hot, problems such as a user misunderstanding that the charger is malfunctioning or the battery pack is heated by radiant heat occur.

Japanese Patent Laid-Open No. 2004-236450

  The present invention has been made for the purpose of solving the conventional problems. A main object of the present invention is to provide a charger capable of suppressing adverse effects caused by the heat generated by the charger.

Means for Solving the Problems and Effects of the Invention

  A first charger according to the present invention is a charger for setting a battery pack BP extended in one direction to an upright posture and charging the battery pack BP. A main body case 10 which is larger than the bottom surface of the battery pack BP to which the battery pack BP is mounted, a mounting portion 20 provided on the upper surface of the main body case 10 for mounting the battery pack BP in an upright posture, and the main body case Circuit board 30 mounted with a charging circuit 32 for supplying power to charge the battery pack BP mounted in the mounting unit 20 and the surface of the main body case 10 and having heat insulation. A cover part 14, and the inside of the main body case 10 is divided into a battery mounting area in which the mounting part 20 is provided and a circuit arrangement area in which the charging circuit 32 is arranged, and the mounting part 20. The It can be provided at a position eccentric from the center of the serial body case 10. As a result, in the charger that stably holds the battery pack in a state where the upper surface of the charger is made larger than the bottom surface of the battery pack and the battery pack is mounted vertically, the battery pack is not set at the center. By setting the position shifted from the center, the internal space is continuously secured, and parts and the like are easily arranged. Further, by disposing the circuit arrangement area where the charging circuit for generating heat is arranged so as not to overlap the battery installation area where the battery pack is installed, the battery pack can be prevented from being heated by the charging circuit or the like. Further, the heat insulating cover portion provided on the surface of the main body case can suppress the heat generated by the charging circuit mounted on the circuit board from the surface of the charger.

  Further, the second charger can form a gap GP between the cover part 14 and the surface of the main body case 10. Thereby, in addition to the heat insulating cover portion, heat insulation of the air layer can be further interposed between the cover portion and the charger surface, so that heat radiation from the charger surface can be further suppressed.

  Furthermore, the third charger further includes leg portions 44 provided at corners on the bottom surface of the main body case 10 and a heat radiating plate 40 disposed on the bottom surface inside the main body case 10. Can do. Thereby, heat can be radiated from the bottom surface side of the main body case, and an advantage that the amount of heat radiated from the surface side can be relatively reduced is obtained.

  Furthermore, the fourth charger interposes a heat conductive sheet 42 between the heat radiating plate 40 and the circuit board 30, and heats the heat radiating plate 40 and the circuit board 30 with the heat conductive sheet 42. Can be combined. Thereby, the heat generation of the circuit board can be efficiently conducted to the heat radiating plate, and the heat radiating performance from the bottom surface side of the charger can be enhanced.

  Furthermore, the fifth charger further includes a display unit 50 provided on the upper surface of the main body case 10, and the display unit 50 can be formed of a semiconductor light emitting element. Thereby, the operation of the charger can be confirmed by the display means, and even if the surface temperature of the charger rises, it is possible to avoid the situation that it is misunderstood as abnormal heat generation by indicating to the user that the charger is operating.

  Furthermore, in the sixth charger, the cover portion 14 can have translucency. Thereby, the appearance of the charger can be improved by giving the cover part translucency, and the design can be easily changed by replacing the cover part. Further, the display device can diffuse the light emitted from the semiconductor light emitting element to realize a display with better appearance.

  Furthermore, in the seventh charger, the battery mounting area and the circuit arrangement area can be diagonally arranged inside the main body case 10. Thereby, the site | part which installs a battery pack and the site | part which provides the member which generate | occur | produces heat can be spaced apart as much as possible in the limited space in a main body case, and the influence which heat can have on a battery pack can be reduced.

  Furthermore, the eighth charger can further include an engagement structure that mechanically engages and connects the battery pack BP to the mounting portion 20. As a result, the battery pack can be mechanically coupled with the battery pack attached to the charger, and the reliability of electrical connection can be improved while improving the stability of the connection.

  Furthermore, the ninth charger can partition the battery mounting area with ribs 16 inside the main body case 10. As a result, even if water droplets or the like enter from the part where the battery pack is attached, it is possible to prevent the ribs from entering other parts, preventing heat generation to the battery pack and preventing corrosion of the electronic circuit due to water immersion. Thus, the reliability of the charger is improved.

It is an external appearance perspective view which shows the charger which concerns on one embodiment of this invention. It is an external appearance perspective view which shows the state which attached the battery pack to the charger of FIG. It is a top view of the charger of FIG. It is the external appearance perspective view which looked at the charger of FIG. 1 from the back surface. FIG. 5 is a vertical sectional view taken along line VV in the plan view of FIG. 3. It is a disassembled perspective view which shows the state which removed the cover part and the upper case from the charger of FIG. FIG. 4 is a vertical sectional view taken along line VII-VII in the plan view of FIG. 3. It is the perspective view which looked at the state which removed the lower case from the charger of FIG. 1 from diagonally downward. It is a disassembled perspective view which shows the state which removed the heat radiating plate and the heat conductive sheet from the charger of FIG. It is an external appearance perspective view which shows the state which looked at the charger of FIG. 1 from diagonally downward. It is a circuit diagram which shows the state which connected the battery pack to the charger. It is a perspective view which shows the state which set the battery pack to the conventional charger.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below is for embodying the technical idea of the present invention, and the present invention is not specified as follows. In the present specification, in order to facilitate understanding of the scope of claims, the numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is appended to the members shown. However, the members shown in the claims are not limited to the members in the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention only to the description unless otherwise specified. It's just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.

  In FIG. 1, the external appearance of the charger 100 which concerns on one embodiment of this invention is shown. The charger 100 sets the battery pack BP and charges the battery pack BP. For this reason, the charger 100 is connected to an external power source such as a commercial power source, converts power obtained from the external power source into power suitable for charging the battery pack BP, and supplies power to the battery pack BP. To charge. For this reason, a charging circuit 32 for converting electric power supplied from the outside into a charging voltage is housed inside the charger 100 (details will be described later).

A charger 100 shown in FIG. 1 includes a main body case 10 whose outer shape is a box shape. A mounting portion 20 for setting the battery pack BP in an upright posture is provided on the upper surface of the main body case 10. As shown in FIG. 2, the battery pack BP is inserted into the mounting unit 20 in an upright posture and charged. The battery pack BP has a box-like outer shape that is elongated vertically. In addition, a pack-side connector for connecting to the mounting portion 20 of the charger 100 is provided on the bottom surface. Here, the battery pack for assist bicycles is shown as the battery pack BP. However, the present invention can also be used as a charger for other electric vehicles or other battery packs such as electric tools, electric motorcycles, and portable devices.
(Mounting part 20)

  The upper surface of the main body case 10 is larger than the bottom surface of the battery pack BP in order to place the battery pack BP. A mounting portion 20 for mounting the battery pack BP is provided on the upper surface of the battery case. The mounting portion 20 is recessed from the surface of the charger 100 and held in an upright posture with the battery pack BP inserted into this portion. In the example shown in the plan view of FIG. 3, the mounting portion 20 is provided in a battery mounting area to be described later. Here, it is provided not at the center of charger 100 but at a position eccentric to the right in the drawing.

  In general, in order to stably hold a vertically long battery pack in a state where it is set in a charger, it is preferable to provide a mounting portion near the center of the charger from the viewpoint of the center of gravity and balance. In particular, in order to install a large and heavy battery pack such as a battery pack for assist bicycles in a vertical position, it is important to consider the weight balance, and it is desirable to place the battery pack in the center.

  Here, the mounting portion for mounting the battery pack is formed in a concave shape so that the lower end of the battery pack is partially buried in the charger, and thus partially occupies the space inside the charger. It will be. For this reason, if a mounting part is arrange | positioned in the center, the internal space of a charger will be parted, the magnitude | size of each space of the both sides parted by the mounting part will become narrow, and space efficiency will worsen. For example, in order to efficiently arrange relatively large members such as transformers and coils, it is preferable to secure a gathered space. In addition, when the mounting portion is disposed at the center, the charging circuit is disposed so as to surround the periphery thereof. The electronic components that constitute the charging circuit include members that generate a large amount of heat, such as power transistors, diodes, and transformers. For this reason, if the heat generating member is arranged around the battery pack mounting portion so as to surround the battery pack, the battery pack is heated from the periphery, which may affect the life of the battery pack. It is done.

Therefore, in the present embodiment, by providing the mounting portion 20 for mounting the battery pack BP at a position shifted from the center of the charger 100, the heat generating member is separated from the battery pack BP, thereby reducing the influence of heat. ing. Further, when the mounting portion 20 is shifted from the center, the balance of the center of gravity is relatively lowered. However, by inserting the lower end of the battery pack BP so as to be embedded in the charger 100, the connection stability is improved. Further, in order to realize such embedding, by forming the mounting portion 20 in a concave shape, the internal space of the charger 100 is partially divided, but by providing it at a position eccentric from the center as described above, The space inside the main body case 10 is secured widely by minimizing the division.
(Engagement structure)

  In addition, a mechanical connection structure can be added so that the battery pack BP is mechanically firmly coupled to the mounting portion 20. For example, in the examples of FIGS. 1, 2, and 4, an engagement structure that engages the battery pack BP and the charger 100 is provided. Here, the shape of the mounting portion 20 is concave, and is formed in a stepped shape corresponding to the bottom surface of the battery pack BP. Furthermore, a notch 18 is formed in the concave inner wall surface, and is configured to engage with a convex portion 19 provided in the battery pack BP. With such an engagement structure, a mechanical connection structure can be realized and the connected state can be maintained in a state where the battery pack BP is mounted on the charger 100.

In addition, a connection terminal 22 is provided on the bottom surface of the mounting portion 20 for electrical connection with the battery pack BP. As shown in the sectional view of FIG. 5, the connection terminal 22 has a flat plate shape that penetrates the bottom surface of the mounting portion 20, and is connected to an electrical component such as the charging circuit 32 on the inner surface side of the main body case 10. The connection terminal 22 is connected to a pack-side connector provided on the bottom surface of the battery pack BP. As a result, power can be supplied to the battery pack BP, and an electric signal can be exchanged between the battery pack BP and the charger 100. In this example, four flat connection terminals 22 are arranged in parallel. Among these, the two connection terminals 22 at both ends are high voltage terminals, and the two inner connection terminals 22 are signal terminals.
(Main body case 10)

  The charger 100 divides the main body case 10 into an upper case 11 and a lower case 12 as shown in an exploded perspective view of FIG. This main body case 10 is comprised with the insulating member excellent in heat insulation and heat resistance. In this example, it is made of polycarbonate ABS resin. A circuit board 30 on which a charging circuit 32 is mounted is housed inside the main body case 10. The charging circuit 32 is a circuit that supplies power to charge the battery pack BP attached to the attachment unit 20. Here, power supplied from an external power source is converted into power suitable for charging.

  As described above, inside the main body case 10, a circuit arrangement area in which the charging circuit 32 is arranged and a battery mounting area in which the mounting portion 20 is provided are divided. In other words, the heat generating member is arranged in the circuit arrangement area and not arranged in the battery mounting area, thereby avoiding heat transfer to the battery pack BP as much as possible. Further, it is preferable that the battery mounting area and the circuit arrangement area are diagonally arranged inside the main body case 10, and by such arrangement, a part where the battery pack BP is attached and a part where a member that generates heat is provided. Can be separated as much as possible in a limited space in the main body case 10, and the influence of heat on the battery pack BP can be reduced.

Further, the charger 100 may have a waterproof structure. In this case, as shown in the cross-sectional view of FIG. 5, the connection terminal 22 does not affect the electronic components such as the charging circuit 32 even if the interior of the main body case 10 is submerged from the portion where the connection terminal 22 is provided. A rib 16 is provided on the back side of the main body case 10 to physically partition the inside of the main body case 10. The battery mounting area is closed by the rib 16 but is not sealed. In addition, a drain hole is provided on the lower surface of the partitioned room, so that water submerged from the upper part can be discharged to the outside. In this way, from the back surface side of the mounting portion 20 where the battery pack BP is arranged, electronic components are eliminated as much as possible, and heat is transmitted to the battery pack BP located at the top by not arranging the heat generating member on the lower surface of the battery pack BP. In addition to preventing this, even if water or the like enters, the electronic circuit can be prevented from being affected, and the reliability of the battery pack BP can be improved.
(Display means 50)

Further, a display means 50 is provided on the upper surface of the main body case 10. The display means 50 is provided at a site different from the mounting unit 20. In the example of FIG. 6, display means 50 is provided on the left side of the mounting portion 20. The display means 50 indicates that the charger 100 is operating. For example, it blinks red during charging, and when charging is completed, it switches to continuous lighting, so that the user can be notified of the progress and termination of charging. As the display means 50, a semiconductor light emitting element can be suitably used. In particular, LEDs have low power consumption and can be suitably used without fear of running out of balls. Thus, the operation of the charger 100 can be confirmed by the display means 50, and even if the surface temperature of the charger rises, it is possible to avoid the situation that it is misunderstood as abnormal heat generation by indicating to the user that it is operating. .
(Cover 14)

  Further, as shown in the exploded perspective view of FIG. The cover part 14 is formed in a size and shape in which the mounting part 20 is cut out so as to cover the upper surface of the upper case 11 excluding the mounting part 20.

  This cover part 14 is made into the member excellent in heat insulation. As described above, the heat insulating effect can be further enhanced by disposing the heat insulating cover 14 on the upper surface of the heat insulating main body case 10, and the heat inside the charger is conducted to the surface of the charger. To suppress that. In particular, by improving the thermal insulation effect on the upper surface of the upper cover that is easy for the user to touch, even if the user touches the hand during charging, it avoids feeling abnormal due to the high temperature or causing low-temperature burns. it can.

  Moreover, it is preferable that the cover part 14 is provided with translucency. Thereby, the designability of the charger 100 can be improved. For example, by changing the color and transparency of the cover part 14, it can be easily changed to chargers of various designs. In addition, the light emission of the semiconductor light emitting element in the display means 50 is diffused to realize a display with better appearance. For example, the vicinity of the light emitting portion of the LED can be textured to diffuse the light and produce planar light emission.

Furthermore, the cover part 14 can be overlapped on the upper case 11 so that the upper surface of the main body case 10 can be double protected, and the mechanical strength can be improved. A battery pack BP charger having a relatively large and heavy weight, such as a battery pack for an assist bicycle, is often used on the floor. For this reason, it is conceivable that the user steps on the foot or accidentally drops the battery pack BP on the upper surface of the charger. For this reason, by reinforcing the surface of the upper case 11 from the strength surface, a secondary effect that it is possible to counter such external force can be obtained. The cover portion 14 is made of polycarbonate in order to have sufficient strength.
(Gap GP)

A gap GP is formed between the cover portion 14 and the surface of the main body case 10. By forming such a gap GP, a heat insulating layer of an air layer is further formed, and the amount of heat released from the surface of the charger 100 can be further suppressed. The size of the gap GP is about 0.05 mm to 2 mm, preferably about 0.2 mm. Further, the cover portion 14 and the surface of the main body case 10 do not need to be separated from each other, and may be in partial contact.
(Heat dissipation plate 40)

Furthermore, the charger 100 is provided with a heat dissipation mechanism for radiating heat to the bottom surface side. That is, the heat radiating plate 40 is disposed on the bottom surface inside the main body case 10. In the example shown in the cross-sectional view of FIG. 7, the heat dissipation plate 40 is disposed on the back side of the circuit board 30. The heat radiating plate 40 is made of a metal having excellent thermal conductivity, such as an aluminum plate. The heat radiating plate 40 does not necessarily have to be provided on the front surface of the circuit board 30 and can be efficiently radiated by being preferably disposed in the circuit arrangement region, more preferably in the vicinity of a member that generates heat. In the example shown in the perspective view of FIG. 8, it arrange | positions centering on the site | part on the diagonal of a battery mounting area | region.
(Thermal conduction sheet 42)

  Furthermore, as shown in the exploded perspective view of FIG. 9, a heat conductive sheet 42 is interposed between the heat dissipation plate 40 and the circuit board 30. The heat conductive sheet 42 is a member having insulation properties and excellent heat conductivity. Thereby, the thermal coupling between the heat radiating plate 40 and the circuit board 30 can be enhanced, the heat conduction from the circuit board 30 to the heat radiating plate 40 can be promoted, and the heat radiation property can be enhanced. The heat conductive sheet 42 preferably has flexibility. Thereby, it can press between the thermal radiation plate 40 and the circuit board 30, can reduce the clearance gap in a contact surface, and can prevent formation of an air layer. For the heat-dissipating sheet 40, for example, a silicone material such as a sircon sheet (trade name) can be suitably used. Moreover, it is preferable to coat a highly conductive member such as a metal on the contact surface of the circuit board 30 with the heat radiating sheet 40 in order to enhance heat conduction. In the example of FIG. 9, two heat conductive sheets 42 are stacked.

In addition, leg portions 44 are provided on the bottom surface of the main body case 10 so as to facilitate heat dissipation, and the bottom surface of the main body case 10 and the installation surface of the charger 100 are separated from each other. The leg portions 44 are provided at the four corners of the lower case 12 as shown in the perspective view seen from the bottom of FIG. As a result, heat dissipation from the back surface side of the lower case 12 is promoted, so that heat conduction to the upper case 11 can be relatively suppressed. Moreover, since the back surface of the lower case 12 is not a part which a user usually touches, safety is also ensured.
(Charging circuit 32)

  Next, a circuit diagram of the charging circuit 32 is shown in FIG. Among the connection terminals 22 of the mounting part 20, the positive and negative charging terminals 22a arranged at both ends are connected to the positive / negative charging / discharging terminals 34 of the battery pack BP set in the mounting part 20, and charge power to the battery pack BP. Supply. As shown in the circuit diagram of FIG. 11, the charging terminal 22a on the positive electrode side is connected to the charging circuit 32, supplies power to the battery pack BP, and charges the battery 39 built therein. The charger 100 shown in the figure converts an alternating current power supplied from a commercial power source (not shown) into a direct current by a rectifier circuit 33, converts this direct current voltage into a charging voltage by a charging circuit 32, and charges a charging terminal 22a. Output from. The charging circuit 32 changes the duty ratio for controlling ON / OFF of a switching element (not shown) connected between the output side of the rectifier circuit 33 and the charging terminal 22a on the positive electrode side, for example. The charging voltage and charging current are adjusted to be optimal for charging the pack BP.

  A signal terminal 22b is disposed as a non-charging terminal between the pair of charging terminals 22a. The connection terminal 22 shown in the figure includes two signal terminals 22b. These signal terminals 22b are an abnormality signal terminal to which an abnormality signal of the battery 39 built in the battery pack BP is inputted, a temperature signal terminal to which a temperature signal of the battery 39 built in the battery pack BP is inputted, and a battery pack BP. An identification signal terminal or the like to which an identification signal of the battery 39 built in is input. In this example, two signal terminals 22b are provided, but three or more or only one may be used. Further, the signal terminal may be a signal terminal that transmits signals other than these, for example, the state of charge of the battery and various information of the battery.

  When an abnormality signal is input to the abnormality signal terminal 22b, the control circuit 31 determines that the battery pack BP is abnormal, and switches the charging circuit 32 off to stop charging. Further, the control circuit 31 detects the temperature of the battery 39 built in the battery pack BP from the temperature signal input to the temperature signal terminal 5b. When the battery temperature becomes higher than the maximum temperature, the control circuit 31 cuts off the charging current and interrupts charging, or reduces the charging current to lower the battery temperature. When the battery temperature becomes lower than the set temperature, the battery is charged with a normal charging current.

  Further, the control circuit 31 determines the optimum voltage and current value for charging the battery pack BP from the battery identification signal input from the identification signal terminal, and changes the charging voltage and charging current output from the charging terminal 22a. When the battery pack BP is mounted, the charger 100 receives the battery identification signal output from the control unit 36 of the battery pack BP by the control circuit 31, and the control circuit 31 receives the input battery identification signal. Then, the type of the battery pack BP is determined, and the charging circuit 32 is controlled so that the voltage and current value are optimal for charging the battery pack BP. The charger 100 determines the charging voltage and charging current for charging the battery pack BP from the battery identification signal input from the battery pack BP and switches to the optimum voltage for charging. A plurality of types of battery packs BP having different output voltages can be charged. However, the charger does not necessarily need to switch the output voltage, and can charge the battery pack with a constant output voltage.

  The battery pack BP is detachably attached to an electric device such as an electric tool and supplies power to these devices. Although not shown, this battery pack BP has a plurality of rechargeable secondary batteries built into the casing. The secondary battery built in the battery pack BP is a lithium ion battery. However, the secondary battery may be any other battery that can be charged, such as a nickel metal hydride battery, a nickel cadmium battery, or a polymer battery. Although not shown, the plurality of secondary batteries are connected in series to increase the output voltage, and the plurality of secondary batteries are connected in parallel to increase the output current. The battery pack BP that uses a lithium-ion battery as the secondary battery, for example, connects 16 batteries in a 4-by-4 series and sets the output voltage to 14.4 V, or connects 20 batteries in a 5-by-4 series. The output voltage is set to 18V. However, the battery pack does not specify the number of built-in secondary batteries or the connection state. In the battery pack, the number of secondary batteries incorporated and the output voltage can be designed in various ways according to the type and application of the electric equipment to be used.

  Furthermore, the battery pack BP shown in FIG. 11 includes a plurality of external terminals 37 connected to the plurality of connection terminals 22 arranged in the mounting portion 20 of the charger 100. The plurality of external terminals 37 are arranged on the bottom surface facing the bottom surface of the mounting portion 20 in a state where the battery pack BP is mounted on the mounting portion 20 of the charger 100. The battery pack BP of FIG. 1 is provided with a plurality of convex portions 19 on the side surface at the lower end of the battery pack case, and is guided to the notch 18 provided in the mounting portion 20 of the charger 100 to be in a fixed position of the mounting portion 20. To be set.

  The charger according to the present invention can be suitably used as, for example, a battery pack charger for an electrically assisted bicycle, or a battery pack charger for an electric motorcycle, an electric tool, a portable device, or the like.

DESCRIPTION OF SYMBOLS 100, 100X ... Charger 10, 10X ... Main body case 11 ... Upper case 12 ... Lower case 14 ... Cover part 16 ... Rib 18 ... Notch 19 ... Convex part 20 ... Mounting part 22 ... Connection terminal; 22a ... Charging terminal; ... Signal terminal 30 ... Circuit board 31 ... Control circuit 32 ... Charge circuit 33 ... Rectifier circuit 34 ... Charge / discharge terminal 36 ... Control part 37 ... External terminal 39 ... Battery 40 ... Heat radiation plate 42 ... Heat conduction sheet 44 ... Leg 50 ... Display means BP, BPX ... battery pack GP ... gap

Claims (9)

A battery pack (BP) that is extended in one direction is set in an upright posture and charged by the charger,
A main body case (10) whose outer shape is a box shape and whose upper surface area is larger than the bottom surface of the battery pack (BP) to be mounted,
A mounting portion (20) for mounting the battery pack (BP) in an upright posture provided on the upper surface of the main body case (10),
A circuit board (30) mounted with a charging circuit (32) for supplying power to charge the battery pack (BP) mounted in the mounting portion (20), which is built in the main body case (10),
Covering the surface of the main body case (10), a cover portion (14) having heat insulation,
With
The inside of the main body case (10),
A battery mounting area provided with the mounting portion (20),
A circuit arrangement area in which the charging circuit (32) is arranged;
It is divided into
The charger is characterized in that the mounting portion (20) is provided at a position eccentric from the center of the main body case (10). The charger according to claim 1,
A charger comprising a gap (GP) formed between the cover (14) and the surface of the main body case (10). The charger according to claim 1, further comprising:
Legs (44) provided at the corners on the bottom surface of the main body case (10),
A heat dissipating plate (40) disposed on the bottom side inside the main body case (10);
A charger comprising: The charger according to claim 3,
Between the heat dissipation plate (40) and the circuit board (30), a heat conductive sheet (42) is interposed,
A battery charger comprising the heat conductive sheet (42) and the heat radiating plate (40) and the circuit board (30) thermally coupled to each other. The charger according to any one of claims 1 to 4, further comprising:
Display means (50) provided on the upper surface of the main body case (10)
With
The battery charger characterized in that the display means (50) comprises a semiconductor light emitting element. The charger according to claim 5, wherein
The battery charger characterized in that the cover (14) has translucency. The charger according to any one of claims 1 to 6,
Inside the main body case (10), the battery mounting area and the circuit arrangement area are arranged diagonally. The charger according to any one of claims 1 to 7, further comprising:
A battery charger characterized by comprising an engaging structure for mechanically engaging and connecting the battery pack (BP) to the mounting portion (20). The charger according to any one of claims 1 to 8,
The battery charger, wherein the battery mounting region is partitioned by a rib (16) inside the main body case (10).

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