JPS5980122A - Method of dissipating heat of storage battery charger/discharger - 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 The present invention relates to a method for dissipating heat from a semiconductor element for controlling charging and discharging of a storage battery charging and discharging device.

In order to prevent capacity reduction due to self-discharge, secondary batteries such as lead-fed batteries are constantly charged to maintain a predetermined capacity. However, actual storage batteries tend to lose capacity due to aging due to repeated charging/discharging cycles and long-term use, making it impossible to supply the necessary power in emergencies such as power outages.

For this reason, in order to understand the state of deterioration of storage batteries, discharge tests are periodically performed on storage batteries to check the battery capacity, and if the capacity has significantly decreased, measures such as replacement are taken.

FIG. 1 shows a conventional storage battery charging/discharging device for testing, in which 1 is a commercial power source, 2 is a rectifier, and 3 is a lead-acid battery. 4 is a charging current control semiconductor element for controlling the charging current to be constant when charging the storage battery 3;
5 is electricity storage 7I! ! 3 is a discharge current control semiconductor element for controlling the discharge current to be constant during discharge, and 6.7 is a heat dissipation fin for dissipating the heat generated by the loss of the control semiconductor element 4.5. 8 is a control circuit for controlling the current flowing through the control semiconductor elements 4 and 5 at a constant level, 9 is a switch for switching charging and discharging, and 10 is a shunt for detecting the charging and discharging current.

This charging/discharging device is a power storage/I! When carrying out the discharge test No. 13, first switch switch 9 to the solid line side,
The control circuit 8 is connected to the discharge current control semiconductor element 5 side. In this case, since no drive signal is sent to the charging current control semiconductor element 4, the input and output of the semiconductor element 4 are in an open state. On the other hand, since a drive signal is sent to the discharge current control semiconductor element 5,
The semiconductor element 5 becomes conductive, and the storage battery 3 discharges via the semiconductor element 5 and the shunt 10.

The discharge current at this time is detected by the shunt 10, and the detection signal is manually input to the control circuit 8, where it is compared with a reference value, etc., and the error signal after this comparison is sent via the switch 9. The discharge current is then sent to the semiconductor element 5, the impedance of the semiconductor element 5 is controlled, and the discharge current at that time becomes constant.

Then, when the storage battery 3 is discharged with a constant current and the voltage of the storage battery reaches the discharge end voltage, the switch 9 is activated.
When switching from the solid line side to the broken line side, the semiconductor element 5 becomes open, and the other semiconductor element 4 becomes conductive.

Thereby, the storage battery 3 is charged by the current flowing through the rectifier 2, the semiconductor element 4, and the shunt 10.

At this time, the charging current is detected by the shunt 10, the detection signal is compared with a reference value by the control circuit 8, and the error signal after this comparison is sent to the semiconductor element 4 via the switch 9. The impedance of the element 4 is controlled and the charging current becomes constant. This charging is
The energization is terminated when approximately 120% to 130% of the discharge amount is reached.

In addition, the capacity of storage battery 3 is 1! The amount of discharge is determined by multiplying the current by the time from the start of discharge to the end of discharge, and this is determined by temperature correction.

Conventionally, as a method for dissipating heat from the control semiconductor elements 4.5 of such a charging/discharging device, each of the control semiconductor elements 4.5 is provided with a heat dissipation fin 6.7, as described above.

However, if heat dissipation fins 6.7 are provided for each of the control semiconductor elements 4 and 5, as the capacity of the storage battery 3 increases and the charging/discharging current increases, the loss of the control semiconductor elements 4 and 5 increases, causing heat dissipation. As a result of the 6.7 large fins, there was a drawback that the charging/discharging device also became large.

The present invention has been made in view of the above, and an object of the present invention is to use heat dissipation fins for a semiconductor element for charging current control and a semiconductor element for discharging current control, thereby reducing the size of the device. An object of the present invention is to provide a heat dissipation method that makes it possible to dissipate heat.

Examples of the present invention will be described below. FIG. 2 shows one embodiment, and the same parts as in FIG. 1 are given the same reference numerals. In this embodiment, the charging current controlling semiconductor element 4 and the discharging current controlling semiconductor element 5 are arranged in one heat dissipating fin 11. As explained in FIG. 1, charging and discharging are not performed at the same time, so when the discharge current control semiconductor element 5 is operating, the charging ta source current control semiconductor element 4 is not operating, and the charging current control semiconductor element 4 is not operating. When the semiconductor element 4 is operating, the discharge current control semiconductor element 5 is not operating. Therefore, both conductor elements 4,
As shown in FIG. 2, the conductor element 4.5 for both years is attached to the heat radiation fin 11 of any size for the semiconductor element 4.5 in FIG. That is, the radiation fin 11 shown in FIG. 2 has the same size as the radiation fin 6 or 7 shown in FIG.

As explained above, according to the present invention, the heat dissipation fins of the semiconductor element for controlling the charging current and the semiconductor element for controlling the discharging current can be used, so the device can be made smaller and more economical. It also has some advantageous features.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram of a conventional storage battery charging/discharging device, and FIG. 2 is a circuit diagram of a storage battery charging/discharging device according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Commercial power supply, 2... Rectifier, 3... Lead-fed battery, 4... Semiconductor element for charging current control, 5... Semiconductor element for discharging current control, 6.7... Heat dissipation fin, 8...
・Control circuit, 9... Switch for charge/discharge switching, lO・
...Shunt, 11...Radiating fin. (Saikyo Ishi) Tamai, Nippon Telegraph and Telephone Public Corporation Representative, Patent Attorney Tomei Nagao

Claims (1)

[Claims] (1) In a storage battery charging/discharging device that receives a commercial power source and includes a semiconductor element for controlling a storage battery charging current and a semiconductor element for controlling a storage battery discharging current, the semiconductor element for controlling the storage battery charging current or the semiconductor element for controlling the storage battery discharging current is provided. The semiconductor device for controlling the storage battery charging current and the semiconductor device for controlling the storage battery discharging current are mounted on a heat radiation fin having a size capable of radiating heat due to loss generated in the device, and the semiconductor device for controlling the storage battery charging current and the storage battery are mounted. A heat dissipation method for a storage battery charging/discharging device characterized by dissipating heat generated in a semiconductor element for controlling discharge current.