JPH0513108A - Secondary battery - Google Patents

Abstract

PURPOSE:To conduct charging control in accordance with classification by providing a charging control device with a charging control part, identification code decoder and secondary battery internal temperature detection part while providing a senior secondary battery with a secondar battery cell, identification code generation part and internal temperature detection part. CONSTITUTION:A source current is input through a terminal A and controlled by a charging control part 2 to charge a cell 6 of a senior secondary battery 5 through a terminal B. An identification signal generated by an identification code generation part incorporated in the battery 5 is superposed on temperature information of an incorporated battery internal temperature detection part 8 to be transmitted through a terminal C to an identification code decoder 3 and a battery internal temperature detection part 4 both incorporated in a charging control device 1. The decoder 3 transmits a decision signal of continuous/intermittent charging the control part 2. The temperature detection part 4 transmits a decision signal of charging/stop according to internal temperature of the battery 5. The control part 2 based on this signal selects large current continuous plus temperature intermittent control or ordinary continuous charging.

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 for a portable VTR or the like, and more particularly to a secondary battery for charging in a shorter time.

[0002]

2. Description of the Related Art In recent years, there are various types of secondary batteries and devices for charging these secondary batteries, and charging in a shorter time is required. However, the secondary battery has the property that the internal temperature rises as a large amount of current is flown in order to charge it in a short time, and it is destroyed when it exceeds a certain temperature. Charging is impossible.

On the other hand, as a method for solving this problem, there is a system called intermittent charging. The method is a method that, instead of charging with a larger current than the continuous charging method, charging is performed while keeping the internal temperature of the secondary battery from rising due to repeated charging and stopping for a certain period of time. Can be charged in a short time. FIG. 6 shows a block diagram of a typical intermittent charging type secondary battery charging control system. In FIG. 6, the solid line shows the flow of the charging current and the broken line shows the flow of the control signal. The power supply current input from the input terminal A is current-limited by the charging control unit 61, and then the secondary battery 63 is charged from the charging output terminal B. Further, in the charge timer unit 62, the timer starts to operate from the start of charging, and a constant charge time and a constant rest time are alternately set. Then, this setting signal is sent to the charging control unit 6
The intermittent charging operation is carried out by alternately sending charging to 1 and stopping charging.

[0004]

However, since the above-mentioned configuration is the intermittent charging operation in which only the time is managed,
The reached value of the internal temperature of the secondary battery upon completion of charging differs depending on the environmental temperature during charging, and for example, when charging in a low temperature environment as shown in FIG. While the charging is completed in the state where the battery is left, in the high temperature environment as shown in FIG. 8, the charging is completed near the critical internal temperature. The temperature must be set so as not to exceed the limit internal temperature, and therefore, there is a problem that it is difficult to dramatically reduce the charging time as compared with the case where continuous charging is performed.
Therefore, as a method for solving this problem, it is conceivable to detect the internal temperature of the secondary battery and control the charging by this internal temperature. However, the temperature is detected by the secondary battery,
If charge control is performed on the charger side by this, conversely, for a general secondary battery having no temperature detection unit, a new problem arises that the versatility of the charger is lost.

The present invention has been made in view of the above problems, and when a charger is connected to a secondary battery,
For the purpose of providing a secondary battery that can know the type of the secondary battery, for example, whether or not it has a temperature detection unit on the charger side, and can cause the charger to perform charging control according to the type There is.

[0006]

The secondary battery of the present invention is a secondary battery cell for charging / discharging, and a temperature for monitoring the temperature of the secondary battery cell and converting it to a temperature information signal. The detector includes a detection unit, an identification code generation unit that generates a code for identifying its type, and an output terminal that outputs the temperature information and the identification code to the outside.

In this secondary battery, when connected to the charger, the temperature information detected by the temperature detector and the identification code generated by the identification code generator are given to the charger through the output terminal, and the charger is charged. By providing the control program of the charging mode according to the type in advance, the type can be known from the identification code, and the charging control according to the type can be performed.

[0008]

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 charging system showing an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a charge control device, which includes a charge control unit 2, an identification code decoder 3, and a secondary battery internal temperature detection unit 4. Reference numeral 5 denotes a high-grade secondary battery, which includes an identification code generator 7 and an internal temperature detector 8 in addition to the secondary battery cell 6. Further, in FIG. 1, the solid line shows the flow of charging current and the broken line shows the flow of signals.

The power supply current input from the input terminal A is current-controlled by the charging control unit 2 and then charged by the charging output terminal B.
Is charged in the cell 6 of the secondary battery 5. The identification signal generated by the identification signal generator 7 incorporated in the advanced secondary battery 5 is a superposition signal with the temperature information from the secondary battery internal temperature detector 8 also incorporated in the advanced secondary battery 5. As C
It is supplied to the identification signal decoder 3 and the secondary battery internal temperature detection unit 4 of the charging control device 1 through the terminal. After that, the identification signal decoder 3 creates a signal for determining continuous charging or intermittent charging according to the presence or absence of the identification signal, and sends it to the charging control unit 2,
In addition, the secondary battery internal temperature detection unit 4 creates a signal for determining whether to charge or stop the charging in accordance with the internal temperature of the advanced secondary battery, and sends the signal to the charging control unit 2. The charging control unit 2 continuously charges an ordinary secondary battery based on these sent signals, and intermittently charges a high-grade secondary battery with a large current by temperature control.

FIG. 2 shows the state of the charging current and the internal temperature of the secondary battery when charging the advanced secondary battery in the low temperature environment, and FIG. 3 shows the state of the same items in the high temperature environment. FIG. 2A shows changes in the internal temperature of the secondary battery. In Fig. 2, because of the low temperature environment, the internal temperature of the secondary battery rises very slowly,
After the continuous charging with the large current I _C , the charging is completed within a time up to about two intermittent operations. On the other hand, in FIG. 3, (a) similarly shows the change in the internal temperature of the secondary battery, but unlike in the case of FIG. 2, this is in a high temperature environment, and therefore the internal temperature of the secondary battery rises. The charging is completed soon after a few intermittent operations. However, in both cases, charging is performed with a large current in an internal temperature state that does not leave an extra margin with respect to the limit internal temperature of the secondary battery, thus charging the secondary battery in a short time. It can be carried out.
Further, it is particularly effective in a low temperature environment.

FIG. 4 is a circuit diagram showing a specific example of the circuit shown in FIG. The charging current from the charging control device 1 flows into the cell 6 of the secondary battery 5 to be charged. A voltage corresponding to the internal temperature of the secondary battery 5 at this time is derived by the thermistor 11,
It is supplied from the OP amplifiers 12 and 15 to the charging control device 1 side via the C ′ terminal of the secondary battery 5. In addition, the secondary battery 5
It is provided with a remaining amount indicator 14 for the voltage of the cell 6 and a CPU 13 for taking in the voltage of the cell 6 and displaying it on the remaining amount indicator 14. Here, the clock signal CLK (= 800 KHz) for the CPU 13 is used as an identification code. That is, the clock signal CLK is O
The P amplifier 15 superimposes it on the DC temperature signal and outputs it from the C'terminal. This output waveform is shown in FIG. On the charging control device 1 side, from the superimposed signal input to the C terminal,
A filter circuit including a resistor 21 and a capacitor 22 and a comparator 25 separate the clock signal component of 800 KHz and the temperature signal component of DC component. Then, the temperature signal component is fetched from the A / DIN terminal of the CPU 26,
A clock signal is taken in from the command IN terminal, the secondary battery 5 can be identified as a high-grade battery by the clock signal, and the temperature signal can perform control according to the temperature.

[0012]

According to the present invention, in addition to the secondary battery cell, the temperature detecting section and the identification code generating section are provided, and the temperature information and the identification code indicating the type can be transmitted from the output terminal to the charger, and the charging can be performed. On the charger side, large current continuous + temperature intermittent control based on temperature information in advance and normal continuous charging can be selected, which is useful for ensuring versatility of the charger.

[Brief description of drawings]

FIG. 1 is a block diagram of a secondary battery charging system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a change in internal temperature of the secondary battery and a charging current characteristic when the advanced secondary battery is charged in a low temperature environment by the system.

FIG. 3 shows a change in internal temperature of the secondary battery and a charging current characteristic when the advanced secondary battery is charged in a high temperature environment by the system.

FIG. 4 is a circuit diagram showing a specific example of FIG.

FIG. 5 is a diagram showing superimposed waveforms of a temperature signal and a clock signal of the specific circuit.

FIG. 6 is a block diagram of a typical secondary battery intermittent charging system in a conventional example.

FIG. 7 is a diagram showing a change in internal temperature of a secondary battery and a charging current characteristic when the secondary battery is charged in a low temperature environment in a conventional example.

FIG. 8 is a diagram showing a change in internal temperature of a secondary battery and a charging current characteristic when the secondary battery is charged under a high temperature environment in a conventional example.

[Explanation of symbols]

 5 Secondary Battery 6 Secondary Battery Cell 7 Identification Code Generator 8 Internal Temperature Detector

 ─────────────────────────────────────────────────── ─── 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 detection unit that monitors the temperature of the secondary battery cell and converts it into a temperature information signal, an identification code generation unit that generates a code for identifying its type, and outputs the temperature information and the identification code to the outside. A secondary battery comprising: