CN2798328Y - Charging apparatus for secondary battery - Google Patents

Abstract

The utility model announces a secondary battery charging device, which includes an insulating shell, a charging power supply circuit, a secondary battery surface temperature monitoring circuit, and a charging current adjustment circuit. At least one of the battery electrode conductive clamping parts is bent into a The thermal sensor is wrapped on the elastic conductive clamping reed. The signal output terminal of the thermal sensor is connected to the input terminal of the secondary battery surface temperature monitoring circuit with a wire. The installation method is novel and the heat conduction efficiency is high. The ambient temperature Close to the surface temperature of the battery, there are no strict requirements for the user to place the secondary battery. As long as the secondary battery is clamped by the elastic conductive clamp for charging, the thermal sensor can detect the temperature. It has the advantages of accurate and timely temperature detection, and can reliably avoid damage to battery performance and service life due to excessive heat accumulation inside the battery, especially causing battery bursts or even fires. The device of the utility model can be widely used for charging various secondary batteries.

Description

A secondary battery charging device

technical field

The utility model relates to a charging device for a secondary battery or a secondary half battery, in particular to a charging device for a secondary battery.

Background technique

Portable electronic products are very popular among modern people for their outstanding features such as small size and easy to carry. It can make people's work, study and entertainment free from time and geographical constraints, and significantly improve work efficiency and quality of life. Portable electronic products widely use secondary batteries, which have the advantages of repeated charging and large capacity. The fast charging device used to charge the rechargeable battery uses a large or super-large current. A thermal sensor is installed near the guide slot where the secondary battery is charged to detect the surface temperature of the battery in real time. When the temperature exceeds the allowable set value, the charging current is reduced or cut off to avoid damage to battery performance due to excessive heat accumulation inside the battery. service life, especially if the battery bursts or even fires. However, there are defects in the following two main installation methods of the thermal sensor of the existing secondary battery charging device: a kind of thermal sensor is embedded in the insulating casing under the guide groove for placing the secondary battery for charging, Because the shell material is a poor conductor of heat, the temperature measurement is inaccurate and untimely; and a kind of thermal sensor is placed on the surface of the guide groove for placing the secondary battery for charging, which is difficult for the user to place the secondary battery. There are strict requirements, the surface of the secondary battery must be close to the surface of the guide groove, otherwise the thermal sensor will lose its function, resulting in the inability to measure the temperature.

Contents of the invention

The technical problem to be solved by the utility model is to make up for the defects of the prior art and provide a secondary battery charging device which improves the installation method of the thermal sensor.

The technical problem of the utility model is solved like this:

This secondary battery charging device includes an inner cavity provided with a guide groove for charging a secondary battery with a corresponding external size and a conductive holder for battery electrodes, and an insulating casing with a printed circuit board in the other inner cavity. , and a charging power supply circuit provided on the printed circuit board to provide charging current to the secondary battery, a secondary battery surface temperature monitoring circuit connected to a thermal sensor at the input end, and a secondary battery surface temperature detection circuit controlled by the secondary battery for adjustment The charging current adjusting circuit for outputting the charging current from the charging power supply circuit.

The characteristics of this secondary battery charging device are:

At least one of the conductive clamping parts of the battery electrodes is an elastic conductive clamping reed that is bent to wrap the thermal sensor on it, and the signal output end of the thermal sensor is connected to the The input terminal of the secondary battery surface temperature monitoring circuit on the printed circuit board. Wrap the thermal sensor on the elastic conductive holder of the battery electrode. When the secondary battery is charged, the battery electrode is in close contact with the elastic conductive clamping reed. The heat conduction efficiency is high, and the ambient temperature of the thermal sensor is close to the surface temperature of the battery. As the charging time increases, the surface temperature of the battery rises rapidly, and the internal heat of the battery is conducted to the thermal sensor attached to it through the elastic conductive clamping reed. Once the thermal sensor detects that the temperature exceeds the allowable set value, Accurately and timely control the charging current adjustment circuit used to adjust the output charging current of the charging power supply circuit to reduce or cut off the charging current, so as to avoid damage to battery performance and service life due to excessive heat accumulation inside the battery, especially causing battery bursting or even fire.

The technical problem of the present utility model can be solved like this:

The elastic conductive clamping reed is an e-shaped elastic conductive clamping reed. The thermal sensor can be firmly wrapped on the battery electrode elastic conductive clamp. When the secondary battery is charged, the battery electrode is in very close contact with the elastic conductive clamp reed, the heat conduction efficiency is higher, and the ambient temperature of the thermal sensor is lower. close to the battery surface temperature.

The elastic conductive clamping reed is an e-shaped elastic conductive clamping reed with excellent thermal conductivity, preferably an e-shaped elastic conductive clamping reed made by bending a nickel-plated or gold-plated phosphor bronze sheet. The charging current adjustment circuit used to adjust the output charging current of the charging power supply circuit can be controlled more accurately and timely to reduce or cut off the charging current, so as to reliably avoid the possibility of damage to battery performance and service life due to excessive heat accumulation inside the battery, especially causing damage to the battery. Burst or even fire.

Technical problem of the present utility model can be further solved like this:

The e-shaped elastic conductive clamping reed can be an elastic conductive clamp for the negative electrode of the battery, an elastic conductive clamp for the positive electrode of the battery, or an elastic conductive clamp for the positive and negative electrodes of the battery.

The thermal sensor can be a semiconductor thermistor, a diode thermal sensor, or an integrated transistor thermal sensor.

The thermal sensor of the utility model has a novel installation method, high heat conduction efficiency, the ambient temperature of the thermal sensor is close to the surface temperature of the battery, and there is no strict requirement for the user to place the secondary battery. The guide groove is clamped by the elastic conductive clamp for charging, and the thermal sensor can detect the temperature. It has the advantages of accurate and timely detection of battery surface temperature, and can reliably avoid damage to battery performance and service life due to excessive heat accumulation inside the battery, especially causing battery bursts or even fires. The charging device of the utility model can be widely used for charging various secondary batteries including nickel-cadmium batteries and nickel-hydrogen batteries.

Description of drawings

The accompanying drawing is a schematic diagram of the installation of a thermal sensor according to a specific embodiment of the present invention.

Detailed ways

The utility model will be further described below with reference to the accompanying drawings and in conjunction with specific embodiments.

A fast charger for a secondary battery with a charging current greater than 1A

This fast charger includes an inner cavity provided with a guide groove for charging a secondary battery 1 with a corresponding external size and a conductive holder for battery electrodes, and an insulating housing with a printed circuit board 2 in the other inner cavity. 3, and the charging power supply circuit provided on the printed circuit board 2 to provide charging current to the secondary battery 1, the secondary battery surface temperature monitoring circuit with a thermal sensor connected to the input end, and the secondary battery surface temperature detection circuit controlled by the secondary battery The charging current adjustment circuit is used for adjusting the output charging current of the charging power supply circuit.

The negative electrode elastic conductive clamping member of the battery is an e-shaped elastic conductive clamping reed 5 bent to wrap the thermal sensor 4 on it. The thermistor 3 is a semiconductor thermistor, and its two ends are connected to the input end of the secondary battery surface temperature monitoring circuit provided on the printed circuit board 2 by wires 6 . The e-shaped elastic conductive clamping reed 5 is an e-shaped elastic conductive clamping reed with excellent thermal conductivity, which is made by bending a gold-plated phosphor copper sheet.

Wrap the semiconductor thermistor on the e-shaped elastic conductive clamping reed 5, when the secondary battery is charged, the battery electrode and the e-shaped elastic conductive clamping reed 5 are in very close contact, the heat conduction efficiency is higher, and the semiconductor thermosensitive The ambient temperature of the resistor is closer to the surface temperature of the battery. As the charging time increases, the surface temperature of the battery rises rapidly, and the internal heat of the battery is conducted to the semiconductor thermistor wrapped on it through the e-shaped elastic conductive clamping reed 5. Once the semiconductor thermistor detects that the temperature exceeds the allowable When the value is set, the charging current adjustment circuit used to adjust the output charging current of the charging power supply circuit is accurately and timely controlled to reduce or cut off the charging current, so as to reliably avoid damage to battery performance and service life due to excessive heat accumulation inside the battery. Especially cause battery explosion or even fire.

The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and it cannot be assumed that the specific implementation of the utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the utility model belongs, without departing from the concept of the utility model, some simple deduction or replacement can also be made, which should be regarded as belonging to the utility model by the submitted claims. Determine the scope of patent protection.

Claims (10)

1. A charging device for a secondary battery, comprising an inner cavity provided with a guide groove for charging a secondary battery of a corresponding external size and a conductive holder for battery electrodes, and another inner cavity provided with an insulator for a printed circuit board. The casing, and the charging power supply circuit provided on the printed circuit board to provide charging current to the secondary battery, the secondary battery surface temperature monitoring circuit connected to the input terminal of the thermal sensor, and the secondary battery surface temperature detection circuit for receiving the control The charging current adjustment circuit for adjusting the output charging current of the charging power supply circuit is characterized in that: At least one of the battery electrode conductive clamping parts is an elastic conductive clamping reed bent to wrap the thermal sensor on it; The signal output end of the thermal sensor is connected to the input end of the secondary battery surface temperature monitoring circuit arranged on the printed circuit board by a conductor. 2. The secondary battery charging device according to claim 1, characterized in that: The elastic conductive clamping reed is an e-shaped elastic conductive clamping reed. 3. The secondary battery charging device according to claim 1 or 2, characterized in that: The elastic conductive clamping reed is an e-shaped elastic conductive clamping reed with excellent thermal conductivity. 4. The battery charging device according to claim 3, characterized in that: The elastic conductive clamping reed is an e-shaped elastic conductive clamping reed made by bending a nickel-plated or gold-plated phosphor copper sheet. 5. The battery charging device according to claim 4, characterized in that: The elastic conductive clamping reed is an elastic conductive clamping piece for the negative electrode of the battery. 6. The battery charging device according to claim 4, characterized in that: The elastic conductive clamping reed is an elastic conductive clamping piece for the positive electrode of the battery. 7. The battery charging device according to claim 4, characterized in that: The elastic conductive clamping reeds are elastic conductive clamping pieces for the positive and negative electrodes of the battery. 8. The battery charging device according to claim 5, 6 or 7, characterized in that: The thermal sensor is a semiconductor thermistor. 9. The battery charging device according to claim 5, 6 or 7, characterized in that: The thermal sensor is a diode thermal sensor. 10. The battery charging device according to claim 5, 6 or 7, characterized in that: The thermal sensor is an integrated transistor thermal sensor.

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