JPH0515079A - Secondary battery with charging control function - Google Patents

Abstract

PURPOSE:To obtain a secondary battery capable of being charged even by a simple-type charger, by providing a secondary battery cell, a temperature detecting section which converts into temperature information signals, - V detecting section, a control signal generating section which controls charging current, and an initial timer for setting a detection inhibiting period for the - V detecting section. CONSTITUTION:A signal is transmitted from the signal output terminal C' of a secondary battery 11 through the signal input terminal C of a charger 1 to the current control section 2 of the charger 1. Under the condition that a voltage drop is not detected with a - V detecting section 14, a control signal is continuously made on at first by temperature information. And if the temperature reaches a specified value being smaller than a limit inside temperature, an intermittent control signal of ON and OFF is outputted after that. When a voltage drop of - V is detected by the - V detecting section 14, a control signal generating section 15 turns the control signal off judging that the charging should be finished. And this makes it possible to charge a battery with a simple- charger having a current control section only.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary battery used in a portable VTR or the like, and more particularly to a secondary battery having its own charge control function.

[0002]

2. Description of the Related Art In recent years, there are various types of secondary batteries and devices that charge the secondary batteries, and most of them have a function of monitoring the state of charge of the secondary batteries and completing the charging normally. It is mounted on the side. FIG. 2 shows a block diagram of the typical secondary battery charging system. In FIG. 2, the solid line shows the flow of charging current and the broken line shows the flow of signals. The charging current input from the input terminal A of the charger 21 is current-limited by the current controller 22 and then passes from the output terminal B of the charger 21 to the input terminal B ′ of the secondary battery 31 to the secondary battery cell 32. Supplied. The voltage at the output terminal B of the charger 21 is -Δ.
It is constantly monitored by the V detection unit 23, and the −ΔV detection information detected here is supplied to the current control unit as a control signal. The initial timer setting unit 24 sets, for the −ΔV detection unit 23, a period during which −ΔV detection is not performed for a certain period after the start of charging. On the other hand, the output signal of the temperature detector 33 built in the secondary battery 31 is transmitted from the output terminal C ′ of the secondary battery 31 through the input terminal C of the charger 21 to the temperature detection unit 25 in the charger 21, It is converted into a control signal and transmitted to the current control unit 22. The current control unit 22 receives two kinds of control signals from the -ΔV detection unit 23 and the temperature detection unit 25 to control the charging current and to normally charge the secondary battery.

[0003]

However, in the above configuration, when the secondary battery is charged, the charging control circuit for monitoring the charging state and completing the charging normally is provided on the charger side. Therefore, the configuration of the charger becomes complicated,
Further, from the side of the secondary battery, there is a problem that a dedicated type charger is required because charging cannot be performed with a simple type charger.

The present invention has been made in view of the above problems, and an object thereof is to provide a secondary battery which can be charged even with a simple type charger.

[0005]

A secondary battery of the present invention is a secondary battery cell for charging and discharging, and a temperature for monitoring the temperature of the secondary battery cell and converting it to a temperature information signal. A detection unit, the terminal voltage of the secondary battery cell is monitored, and a constant voltage drop width after confirming the maximum value -ΔV is detected as information on completion of charging-ΔV detection unit, the temperature detection unit, and the- Based on the information detected by the ΔV detection unit, a control signal generation unit that generates a control signal for controlling the charging current of the charger and the −ΔV detection unit for a certain period from the start of charging. It is characteristically provided with an initial timer section for setting a detection prohibition period for prohibiting the operation.

In this secondary battery, a control signal is generated by the control signal generator and is supplied to the charger, whereby a charging current flows from the charger to the secondary battery cell. After charging is started, -Δ for the time set by the initial timer setting section.
The operation of the V detector is prohibited. Further, the internal temperature is monitored by the temperature detecting section, and the control signal output from the control signal generating section is controlled by the detected temperature. For example, after the start of charging, the control signal for continuous charging is kept ON, and when the internal temperature reaches a predetermined value slightly lower than the limit temperature, the control signal is turned off.
When FF is performed and the temperature drops to a predetermined value, the control signal is turned on again, and thereafter intermittent charging is performed until the charging is completed. On the other hand, when the set time of the initial timer setting unit has elapsed, -ΔV
The detection unit detects that the charging voltage has changed by -V.
By this detection, the control signal generator turns off the control signal,
Stop charging.

[0007]

The present invention will be described in more detail with reference to the following examples. FIG. 1 is a block diagram of a secondary battery showing an embodiment of the present invention. In FIG. 1, the secondary battery 11
Monitors the temperature of the secondary battery cell 12 for charging / discharging, the temperature of the secondary battery cell 12, and the temperature detection unit 13 that converts the temperature information signal, and the terminal voltage of the secondary battery cell 12. , -ΔV detection unit 14 that detects as a charge completion information with a constant voltage drop width after confirming the maximum value, temperature information from the temperature detection unit 3, and voltage information detected by the -ΔV detection unit 14. Of the control signal generator 15 for generating a control signal for controlling the charging current to the charger 1 based on the above, and the -ΔV detector 14 in order not to detect the initial drop at the start of charging. Operation is prohibited for a certain period.
Initial timer setting unit 1 for setting the detection prohibition period
Equipped with 6. In FIG. 1, the solid line shows the flow of charging current and the broken line shows the flow of signals.

Now, when the control signal generator 15 applies a control signal ON, that is, a charge command is applied to the current controller 2 in the state of being connected as shown in FIG. 1, charging is started. Charger 1
The charging current input from the input terminal A of the
After the current is limited by the secondary battery cell 12 from the output terminal B of the charger 1 to the input terminal B ′ of the secondary battery 11.
Is supplied to. The temperature of the secondary battery cell 12 is constantly monitored by the temperature detection unit 13, and the obtained temperature information is converted into a temperature information signal and transmitted to the control signal generation unit 15.
The terminal voltage of the secondary battery cell 12 is constantly monitored by the −ΔV detection unit 14. The detected −ΔV information is transmitted to the control signal generator 15 as a control signal. The control signal generation unit 15 generates and outputs a control signal for controlling the charging current of the charger 1 based on the signals generated by the temperature detection unit 13 and the −ΔV detection unit 14. .. This signal is transmitted from the signal output terminal C ′ of the secondary battery 11 to the current control unit 2 of the charger 1 through the signal input terminal C of the charger 1. For example, in the state where the voltage drop is not detected by the −ΔV detection unit 14, the control signal is continuously turned on first according to the temperature information, and when the temperature reaches a predetermined value lower than the limit internal temperature, the ON and OFF are intermittently thereafter. Output a control signal. When the −ΔV detection unit 14 detects a voltage drop of −ΔV, the control signal generation unit 15 turns off the control signal because the charging is completed. It should be noted that the initial timer setting unit 16 controls the ΔV detection unit 14 within a certain period from the start of charging.
Since the detection prohibition period in which ΔV is not detected is set, the −ΔV detection unit does not operate during that period from the start of charging.

As described above, in the secondary battery with a charging function of this embodiment, the secondary battery is monitored in all the parts other than the current controller in the circuit for monitoring the charging state of the secondary battery and completing the charging normally. It is installed in the battery. When the applicable secondary battery 11 has a remaining amount indicator and the display control is performed by the CPU, the temperature detecting unit 13, the −ΔV detecting unit 14,
The respective functions of the control signal generation unit 15 and the initial timer setting unit 16 can be shared by the CPU.

[0010]

According to the present invention, in the circuit that controls the charge control function, the temperature detecting section, the -ΔV detecting section, the control signal generating section,
Since the secondary battery is provided with the initial timer setting unit and most of the unit, charging can be performed by a simple charger having only a current control unit. In particular, when used as a secondary battery for a device such as a portable VTR, the charger can be greatly simplified. Further, in a secondary battery having a residual voltage display function, a CPU (microcomputer) is provided to perform the processing. However, when the present invention is applied to such a secondary battery, each of the above circuit parts This function is particularly effective because the CPU can fulfill the function of (1) and the function can be improved without significantly increasing the cost of the secondary battery.

[Brief description of drawings]

FIG. 1 is a block diagram of a system for charging a secondary battery with a charge control function according to an embodiment of the present invention.

FIG. 2 is a block diagram of a typical secondary battery charging system in the related art.

[Explanation of symbols]

 11 Secondary Battery 12 Secondary Battery Cell 13 Temperature Detection Unit 14-ΔV Detection Unit 15 Control Signal Generation Unit 16 Initial Timer Setting Unit

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Takashi Horii 18-12 Fukada-cho, Kadoma-shi, Osaka Inside the Yumura Electric Co., Ltd. (72) Inventor Takuma Tamada 18-12 Fukada-cho, Kadoma-shi, Osaka Mura Denki Co., Ltd. (72) Inventor Kazuhide Hirose 18-12 Fukada-cho, Kadoma-shi, Osaka Yumura Electric Co., Ltd. (72) Inventor Susumu Fukusaki 3-13-21 Hisayo, Kawanishi-shi, Hyogo KDI Building (72) Inventor Kenji Ando 2-16 Nakazaki Nishi, Kita-ku, Osaka City, Osaka Prefecture Taiyo Kogyo Co., Ltd.

Claims (1)

Claim: What is claimed is: 1. A secondary battery which can be charged by a charger, and which is a secondary battery cell for charging and discharging.
A temperature detector that monitors the temperature of the secondary battery cell and converts it into a temperature information signal, and a constant voltage drop width (hereinafter -ΔV) after monitoring the terminal voltage of the secondary battery cell and confirming the maximum value.
") Is detected as the information indicating that charging is completed-ΔV
A detection unit, a control signal generation unit that generates a control signal for causing the charger to control the charging current based on the information detected by the temperature detection unit and the −ΔV detection unit,
A secondary battery with a charge control function, comprising: an initial timer unit for setting a detection prohibition period for prohibiting the operation of the −ΔV detection unit for a certain period from the start of charging.