CN203101601U

CN203101601U - Lithium battery capacity simple and fast testing circuit

Info

Publication number: CN203101601U
Application number: CN 201320021188
Authority: CN
Inventors: 何林
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-01-15
Filing date: 2013-01-15
Publication date: 2013-07-31
Anticipated expiration: 2023-01-15

Abstract

The utility model discloses a lithium battery capacity simple and fast testing circuit. The lithium battery capacity simple and fast testing circuit includes a 3.7V lithium battery, a constant current discharge control circuit, a 1.5V quartz clock power supply loop, a discharge indication circuit and a quartz clock. The capacities of mobile phone lithium batteries or other lithium batteries which have been used for a long time and the capacities of lithium batteries disassembled from a laptop battery group are decreased, but the specific capacities of these mobile phone lithium batteries cannot be known. The lithium battery capacity simple and fast testing circuit of the utility model can satisfy the measurement requirements of the lithium batteries; the circuit does not need to be additionally connected with a working power supply and is powered by detected lithium batteries, and the lithium battery simple and fast testing circuit is suitable for lithium batteries with discharge protection boards. Because there is no need to know the exact capacities of the lithium batteries, there is also no need to draw discharge curves, and therefore, the quartz clock is adopted to record discharge time; and the lithium battery capacity simple and fast testing circuit of the utility model is advantageous in easiness in production, low production cost, and convenient usage.

Description

The simple and direct test circuit of lithium battery capacity

Technical field

The utility model belongs to electronic technology and battery boosting technology field, is about the simple and direct test circuit of a kind of lithium battery capacity.

Background technology

The cellular li-ion battery of using for a long time or other lithium batteries, and the lithium battery of pulling down in the cells in notebook computer group, these lithium battery capacities descend, but do not know how many capacity lithium battery also has actually.Through repetition test, the utility model has designed a kind of circuit that meets the lithium battery test request, and this circuit does not need to connect in addition working power, and circuit is suitable for having the lithium battery of discharge prevention plate by tested lithium battery power supply itself.Because do not need to know lithium battery capacity accurately, do not need to draw discharge curve yet, so adopt crystal clock to count the recording playback electricity time, have and make than being easier to, cost of manufacture is low, uses more convenient as low capacity lithium battery test circuit.

Below describe the simple and direct test circuit of lithium battery capacity described in the utility model related relevant technologies content in implementation process in detail.

The utility model content

Goal of the invention and beneficial effect: the cellular li-ion battery of using for a long time or other lithium batteries, and the lithium battery of pulling down in the cells in notebook computer group, these lithium battery capacities descend, but do not know how many capacity lithium battery also has actually.Through repetition test, the utility model has designed a kind of circuit that meets the lithium battery test request, and this circuit does not need to connect in addition working power, and circuit is suitable for having the lithium battery of discharge prevention plate by tested lithium battery power supply itself.Because do not need to know the accurate capacity of lithium battery, do not need to draw discharge curve yet, so adopt crystal clock to count the recording playback electricity time, have and make than being easier to, cost of manufacture is low, uses easily as low capacity lithium battery test circuit.

Circuit working principle: the simple and direct test circuit of lithium battery capacity; be suitable for the lithium battery of discharge prevention plate; it forms the constant-current discharge circuit by elements such as positive-negative-positive silicon triode VT1～VT2 and resistance R 1～R2; be used for the lithium battery constant-current discharge; constant-current discharge electric current 100mA; silicon rectifier diode D1～D2 two ends obtain 1.5V voltage, as the crystal clock power supply, so that timing in discharge process.Because of this circuit discharging later stage actual current less than 100mA, and crystal clock is still in timing, so it is not high enough to record the capacity accuracy of lithium battery, the lithium battery capacity of measuring is bigger than normal a little, but can satisfy general needs.

Technical characterictic: the simple and direct test circuit of lithium battery capacity, it comprises 3.7V lithium battery, constant-current discharge circuit, 1.5V crystal clock electric power loop, discharge condition indicating circuit and crystal clock, it is characterized in that:

The constant-current discharge circuit: it is made up of positive-negative-positive silicon triode VT1, positive-negative-positive silicon triode VT2, resistance R 1 and resistance R 2, the base stage of positive-negative-positive silicon triode VT1 connects the emitter of positive-negative-positive silicon triode VT2 and an end of resistance R 1, the emitter of another termination positive-negative-positive silicon triode VT1 of resistance R 1 and the positive pole of lithium battery, positive-negative-positive silicon triode VT1 collector connects an end of base stage and the resistance R 2 of positive-negative-positive silicon triode VT2, the negative pole of another termination lithium battery of resistance R 2, the collector of positive-negative-positive silicon triode VT2 connect 1.5V crystal clock electric power loop and discharge indicating circuit;

1.5V crystal clock electric power loop: it is made up of silicon rectifier diode D1～D2, the collector of positive-negative-positive silicon triode VT2 connects the positive pole of silicon rectifier diode D1 and the positive pole of crystal clock power supply, the negative pole of silicon rectifier diode D1 connects the positive pole of silicon rectifier diode D2, the negative pole connection circuit ground GND of silicon rectifier diode D2 and the negative pole of crystal clock power supply.

The discharge condition indicating circuit: the positive pole of red light emitting diodes LED connects the collector of positive-negative-positive silicon triode VT2, the negative pole connection circuit ground GND of red light emitting diodes LED.

Description of drawings

Accompanying drawing 1 is the circuit working schematic diagram that the utility model provides a simple and direct test circuit embodiment of lithium battery capacity.

Embodiment

Circuit working schematic diagram and description of drawings according to the simple and direct metering circuit of lithium battery capacity shown in the accompanying drawing 1, and according to the annexation between the components and parts in the described each several part circuit of utility model content, and the components and parts technical parameter described in the embodiment requires to implement to realize the utility model.

The selection of components and parts and technical parameter thereof

The model of VT1 is 8550, also positive-negative-positive triode such as available 2SC9012, require Icm＞300mA, VT2 can select miniwatt positive-negative-positive silicon triodes such as 2SC9015, A1015 for use, require hfe＞150;

The model that silicon rectifier diode D1～D2 selects for use is 1N4000, perhaps selects 1N4148 for use, requires 2 silicon rectifier diode series connection back forward drops just in time to be 1.5V;

LED is a red light emitting diodes, is used to indicate the discharge duty of lithium battery;

All resistance use l/8 W metalfilmresistor, and the resistance of resistance R 1 is 6.8 Ω, and the resistance of resistance R 2 is 1K Ω;

It is 1.5V that crystal clock is selected working power voltage, promptly uses the crystal clock of a batteries.

Device circuit is made general condensed summary and circuit debugging

When making the simple and direct metering circuit of lithium battery capacity, as long as the electronic devices and components performance of selecting for use is intact, and the components and parts annexation in the accompanying drawing 1 is welded to specifications, physical connection line and welding quality through scrutiny correct after, but circuit need not debugged just operate as normal substantially;

The discharge cut-off voltage of the utility model circuit design is 3.3V, is suitable for having the test of discharge prevention plate lithium battery capacity;

Be suitable for being used to measure the test of the following low capacity lithium battery of 600mAh.

Claims

1. simple and direct test circuit of lithium battery capacity, it comprises 3.7V lithium battery, constant-current discharge circuit, 1.5V crystal clock electric power loop, discharge condition indicating circuit and crystal clock, it is characterized in that:

Described constant-current discharge circuit is by positive-negative-positive silicon triode VT1, positive-negative-positive silicon triode VT2, resistance R 1 and resistance R 2 are formed, the base stage of positive-negative-positive silicon triode VT1 connects the emitter of positive-negative-positive silicon triode VT2 and an end of resistance R 1, the emitter of another termination positive-negative-positive silicon triode VT1 of resistance R 1 and the positive pole of lithium battery, positive-negative-positive silicon triode VT1 collector connects an end of base stage and the resistance R 2 of positive-negative-positive silicon triode VT2, the other end connection circuit ground GND of resistance R 2 and the negative pole of lithium battery, the collector of positive-negative-positive silicon triode VT2 connect 1.5V crystal clock electric power loop and discharge indicating circuit;

Described 1.5V crystal clock electric power loop is made up of silicon rectifier diode D1～D2, the collector of positive-negative-positive silicon triode VT2 connects the positive pole of silicon rectifier diode D1 and the positive pole of crystal clock power supply, the negative pole of silicon rectifier diode D1 connects the positive pole of silicon rectifier diode D2, the negative pole connection circuit ground GND of silicon rectifier diode D2 and the negative pole of crystal clock power supply.

2. the simple and direct test circuit of lithium battery capacity according to claim 1, it is characterized in that: the positive pole of red light emitting diodes LED connects the collector of positive-negative-positive silicon triode VT2 in the discharge condition indicating circuit, the negative pole connection circuit ground GND of red light emitting diodes LED.