JPS60109729A - Charger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to a charger.

[Background technology]

Generally, when a storage battery is charged and discharged at low temperatures, its charging efficiency is extremely reduced. This is because the viscosity of electrolyte solutions such as sulfuric acid increases when the temperature drops, and the diffusion rate slows down, resulting in the electrolyte concentration near the electrode plates becoming thinner. For example, cordless circular saws often stop working due to the initial crystal load, and the number of pieces cut decreases.

Conventionally, as a method of heating and keeping a storage battery warm at low temperatures, there is a method of arranging a heater near the storage battery.

For example, in the device disclosed in Japanese Utility Model Publication No. 46-55317, since a heating resistor is provided separately, there is a problem that the loss is large and the power consumption during charging is high, resulting in poor efficiency. Further, even in the device disclosed in Japanese Patent Publication No. 52-7528, the output terminal is used in place of a heater, which often causes the problem that a large amount of power is consumed overnight during charging, resulting in poor efficiency.

In addition, a plurality of magnetic locks are placed in the extending direction of the heat sink.
In the case of a charger that charges 12 storage batteries, the amount of heat transferred to the battery block located away from the heat-generating components is small, and the battery temperature does not rise, resulting in overcharging. On the other hand, batteries that are close to heat-generating parts transfer a lot of heat, causing the battery temperature to rise and becoming insufficiently charged. ! There is a difference in battery life, which means that the battery's performance cannot be fully demonstrated, and it has the disadvantage that its life tends to deteriorate.

[Purpose of the invention]

The present invention has been provided in view of the above-mentioned points, and by heating the battery, charging efficiency is increased and the charging capacity at low temperatures is increased, and heat is uniformly transferred to the battery flock that constitutes the battery. The purpose of this invention is to provide a charger that prevents battery deterioration.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a specific circuit diagram, and FIG. 5 shows an external view of the charger main body A. In Figure 1, (2) is a battery to be charged, and this battery + 210i charging control circuit +
Charging can be controlled from IIK. (3) A transformer that steps down the current power supply 'IX voltage to the required voltage.
) secondary output is 1DID2% conduit switch C1
The rectifying and smoothing circuit (5), which includes the following components, performs full-wave rectification and smoothing. (6) is a voltage detection circuit for detecting the voltage of the battery (2), and is composed of resistors R1 to R1.

(6a) is an output terminal of the voltage detection circuit (6). Between the positive and negative sides of the rectifying and smoothing circuit (5), r is a pond (2
), a diode D4, and a series circuit of 7 diodes rr serving as a heating element are connected to form the main circuit. Voltage detection port # (61) is connected to the positive electrode side of the battery (2), and the output terminal (θa) of the voltage detection circuit (6) is connected to the battery (
2) is connected to terminal ■ of I Cfi+ to control charging. In addition, a Zener diode D for generating a reference voltage is connected to the terminal (■) of ICt8), and the terminal (■) is connected to the
A constant setting capacitor C2, a thermistor R4, and a resistor R5R6 of the timer circuit are connected, respectively, and the other end of each of the above components is connected to the negative side of the rectifying and smoothing circuit (6).

The output terminal (2) of IC+81 is connected to the base of the transistor Tr via a resistor R8. Further, a resistor R7 is connected between the collector and emitter of the transistor 'rr. (8) is a charging indicator lamp.

FIG. 2 shows the functional block diagram of FIG.
It mainly consists of a voltage switch, a V-I converter, etc. The output timer shown in the figure consists of a capacitor C2, a thermistor R4, and resistors R and R6, and the current control section consists of a transistor Tr and a resistor R7. The voltage switch connects the output voltage of the voltage detection circuit and the Zener diode D.
If the Zener voltage is better, the capacitor C2 is charged by the voltage switch, and the voltage from the V-I converter is proportional to the charging voltage of the capacitor C2. The current signal thus obtained is output to the transistors Tr'J and Tr of the current control section. Also,
As will be described later, when the battery (2) is charged and the voltage of the voltage detection circuit (6) becomes higher than the Zener voltage,
] The electric charge of the sensor C2 is discharged, and V is proportional to it.
-The output current from the I converter decreases.

On the other hand, the charger main body A has a charging control circuit (1) shown in UrJ housed in a housing (4) constituting the outer shell, as shown at 71''-T in FIGS. 0 to 6. j(4
) is formed with a notch (11) and a recess for attaching and detaching the battery (2). This recess is designated as the battery storage area (l/).

Inside the helidine 3 (4), lint boards θ are placed where the transformer (3) and the power supply control circuit m are mounted, and the transistors Tr that still consume power are mounted on the heat sink (7). It is fixed at 1st, etc. The heat sink (7) is connected to the battery compartment (10).
) and facing the battery (2) so as to touch the bottom surface of the battery (2). /) Ru. That is, as shown in FIGS. 4 and 6, the heat sink (7) is arranged close to the 1-degree side of the battery storage section (10) as will be described later. Here, heat sink (7
) and (2), the contact with (2) is small near the transistor Tr, and increases as the distance from the transistor Tr increases. That is, as shown in FIG. 8, the upper surface of the heat dissipation plate (7) is cut with two triangular recesses aη having upper surface openings, and the bottom of the recesses aη is formed on the side of the transistor Tr. , the tip is a transistor T
It is formed so as to be located away from r. The contact area between the bottom surface of the battery (2) and the top surface of the heat sink (7) is connected to the transistor TrK by a triangular four-part line.
The closer you get, the less it becomes. Therefore, heat is uniformly transferred from the transistor Tr to the battery (2) via the heat sink (7). The upper ijL four parts (one part constitutes the temperature control means, 03) are partition walls that separate the charging control circuit +11 and the battery (2). The heat dissipation plate (7) is made of an aluminum plate with good thermal conductivity, but the battery compartment (lO) of the housing (4) is molded with two colors of Al'E and foil, and a part of this aluminum foil is made of aluminum. When attaching or detaching the battery (2), which may be fixedly connected to the transistor Tr, when attaching or detaching the battery (2) to the charger, the battery (2)
It is easy to attach and detach the battery, and since it becomes unstable if the charger body A is turned upside down, the battery (2) is placed with the heat sink (2) side on the bottom for charging. The battery (2) can be reliably kept warm by the heat dissipation plate (7) located above (7).

Here, as shown in Fig. 3 and Fig. 0, the charger main body A
A space X is provided between the bottom surface of the heat dissipation plate (7) and the lower surface of the heat sink (7) by interposing a heat insulating material (c). In other words, since the heat sink (7) is supported by the housing (4) via the heat insulating material, the heat generated by the transistor 'rr is prevented from being transferred to the housing (4). Almost all of the battery (2) can be consumed for heating the battery (2), resulting in high charging efficiency. The heat sink (7) is still attached to the housing j (4).
Since no heat is transferred, the temperature of the outer surface of the housing (4) does not become abnormally high, and the user does not feel uncomfortable.

Next, the operation will be explained. As shown in Fig. 7, the voltage V of the battery (2) reaches a voltage V1 at which the voltage V of the battery (2) is cut off by the Zener voltage of the Zener diode D3 connected to the terminal ■ of the IC (8).
Therefore, when the voltage V detected by the voltage detection circuit (6) is smaller, the capacitor C2 connected to the terminal 2 of ICf8) is charged, current is output from the terminal 0, and the transistor Tr is turned on. As a result, photoelectricity starts to be applied to the battery (2). As this charging progresses, the battery voltage V increases,
Then, when this battery voltage (2) reaches the set voltage 71 or higher, the charging current no longer flows to the battery +jC2 due to the operation of the IC+81. As a result, the sensor C2 starts discharging through the thermistor R5R6, and
Due to this discharge, the voltage of capacitor C2 gradually decreases. However, due to the function of IC (8), this capacitor C2
As the voltage decreases, the output current of the terminal (2) and the base current of the transistor Tr gradually decrease, and as a result, the transistor Tr also changes from a saturated state to an unsaturated state. Then, as the discharge of capacitor C2 progresses and its voltage becomes zero, the output current at the terminal @ of the IC axis becomes zero,
Transistor Tr is turned off. However, since a low current determined by the resistor R7 connected to the 7th row of transistors Tr K flows, a supplementary charging current to the battery (2) flows. As shown in FIG. 7, the time from the time t1 when the battery voltage V reaches the set voltage 71 or higher to the time t2 when the charging current becomes a minute current is determined by the capacitor C2, thermistor R4, and resistor R5R6. It is determined by the time constant of K, and by adding two of these values K, the time can be changed as appropriate. In addition, I shown in FIG. 7 is a battery (2
) shows the photocurrent.

Here, when charging the battery (2), a large current flows through the main circuit, and a loss occurs in the transistor TrK, which is emitted as heat. Assuming that the charging current is I and the voltage between the emitter and the collector of l-transistor T is VCK, the loss P is expressed by the following equation.

p=ixvcE (watts) Therefore, the transistor Tr generates heat. The heat generated by this transistor Tr is transferred to the heat sink (7) and the battery (
2) The bottom surface of the battery is heated by a heat sink (7), and the battery temperature is raised to C, allowing reliable charging even at low temperatures.

By the way, as shown in Figs. 8, 9, and 10, the storage battery (2) is busy, with a plurality of batteries (18) connected to the heat sink (7).
They are arranged in parallel in the direction of extension. Here, since the heat of the transistor Tr is transferred in the extending direction of the heat sink (7), the temperature of the surface of the culm heat sink (7) near the transistor Tr is high. But 1. Since the heat sink (7) has a concave portion θη, the closer the transistor Tr is, the smaller the contact area between the heat sink (7) and the storage battery (2), so that each battery block can be removed from the heat sink (7). The amount of heat transferred to the θ calf can be made uniform. Therefore, the amount of charge does not differ for each battery block (I8), and the storage battery (2) can exhibit its original discharge performance and life.

By the way, generally, as shown in FIGS. 9, 10, and 11, the storage battery (2) has a plurality of electrode plates (14) facing each other with spacers 1J5) interposed therebetween, and the same electrode plates H (141) ,
They are connected by a connecting member (16) 116)'. In addition, the connecting member (181 (16)' has a pole column lA'
protrudes and penetrates to the outside of the battery case. In this way, a plurality of battery blocks (181) as shown in FIG. 10 are arranged in parallel and separated by partition walls to form a storage battery (2) as shown in FIG. 8. (F) is inserted into the container (goods) with its five sides in close contact.+23) is the middle lid of the container, and the threshold is the top lid. Fig. 12 shows another embodiment of the terminal, in which the facing area of the battery (2) and the heat sink (7) can be increased as the distance from the transistor Tr, which is the heating element, increases. be. That is, the heat sink (7)
A folded part (2
G) is composed of folded J, and T
As the distance from r increases, the height of the folded portion (support) increases, and the area facing the battery (2) increases to make heat transfer to the battery (2) uniform. In addition, η is a transistor Tr
This is a screw that secures the heat sink to the heat sink (7).

〔Effect of the invention〕

The non-invention is that in the charging circuit as described above, a temperature control means is attached to the heat sink to uniformly distribute the heat radiation from the heat sink to the battery in the charge control circuit that photoelectrically controls the battery. By uniformly transmitting the heat from the heating element to the battery via the heat sink, regardless of whether the pond is near or far from the heating element, heavy oil can be reliably pumped even at low temperatures. It has the effect of being able to charge. However, since heat can be evenly transferred to the multiple battery blocks that make up the battery, and the temperature rise can be made uniform, there is no difference in the amount of charge between the battery blocks, and there is no overcharging or undercharging, which extends the life of the battery. It has an effect that does not deteriorate, and since there is no need for a heater to heat or keep the battery warm, it is possible to obtain a charger with good charging efficiency even at low temperatures at a low cost and with a simple structure. Make the most of your efforts.

[Brief explanation of the drawing]

Fig. 1 is a specific circuit diagram of an embodiment of the present invention, Fig. 2 is a functional block diagram of the same as above, Fig. 5 is a plan view of the charging main body of the same as above,
Figure 4 is a longitudinal sectional view of the same as above, Figure 5 is a broken front view of the same as above,
Figure fJ6 is the cross-sectional view of the same as above, and Figure 7 is the movement tax stamp 1 of the same as above.
Figure 8 is a perspective view showing the relationship between the storage battery and the heat dissipation plate, Figures 9 (a) and 9 (b) are cross-sectional views and front views of the battery block shown above, and Figure 10 is the battery block shown above. Figure 11 is a sectional view showing the internal structure of the battery, Figure 1.2 is a perspective view of the battery.
The figure is a perspective view showing another embodiment of the heat sink same as above. il+ is a charging control circuit, (2) is a battery, (7) is a heat sink, 0η is a recess, A is a charger body, and X is a space. Figure 6 Figure 7 Figure 9 Figure 1 o Figure b Figure 11 Figure 12

Claims (1)

[Scope of Claims] In a charger that charges a battery to be charged by detachably attaching it to the ill charger main body, charging the battery is caused by heat dissipation from a heat dissipation plate of a charging control circuit that controls the battery to the battery. A charger characterized in that a temperature control means is attached to a heat sink to make the distribution of heat uniform. (2) As the distance from the heating element of the charging control circuit increases, r
2. The charger according to claim 1, wherein the contact area between the battery and the heat sink is widened. (3) The charger according to claim 2, characterized in that a recess is provided in the heat sink. (4) The heat sink faces the side surface of the battery, and the height of the heat sink facing the side surface of the battery increases as the distance from the heat generating element increases.
'Charger as described in section. (5) The charger according to claim 1, characterized in that a space is provided between the charger main body and the heat sink.