CN202059163U

CN202059163U - Voltage sensing type protective device of rechargeable battery

Info

Publication number: CN202059163U
Application number: CN2011201144685U
Authority: CN
Inventors: 温凯闵
Original assignee: KUNSHAN BESTS ELECTRONIC CO Ltd
Current assignee: KUNSHAN BESTS ELECTRONIC CO Ltd
Priority date: 2011-04-19
Filing date: 2011-04-19
Publication date: 2011-11-30
Anticipated expiration: 2021-04-19

Abstract

The utility model discloses a voltage sensing type protective device of a rechargeable battery. The protective device includes a rechargeable battery set, a charging terminal, a discharging terminal, a one-chip-microcomputer, a sensing resistor, a current sensing amplifier, LED indicating lamps, a charging control field effect transistor, a discharging control field effect transistor, and a voltage stabilizing chip. The charging battery set converts the voltage of the rechargeable battery into the direct current voltage via the voltage stabilizing chip and then provides the voltage for the operation of the one-chip-microcomputer and the current sensing amplifier. The current sensing amplifier senses the voltages on the two ends of the sensing resistor and sends the voltage information to the one-chip-microcomputer. The one-chip-microcomputer controls the display of the LED indicating lamps. The one-chip-microcomputer controls the connection and the disconnection of the anode of the rechargeable battery set with the charging terminal through controlling the opening and closing of the charging control field effect transistor, and controls the connection and the disconnection of the anode of the rechargeable battery set with the discharging terminal through controlling the opening and closing of the discharging control field effect transistor. The voltage sensing type protective device has the advantages of multiple functions, programmed design, simple structure, and low self-energy-consumption.

Description

Detecting voltage type secondary battery protective device

Technical field

The utility model relates to a kind of detecting voltage type secondary battery protective device.

Background technology

Along with being extensive use of of products such as digital product such as mobile phone, notebook computer, electric bicycle, rechargeable battery also is used widely in this series products, advantages such as rechargeable battery has economy, environmental protection, electric weight foot, it is high-power to be fit to, long-time use, but existing improper use meeting causes damage to battery itself in its use, overcharging or putting excessively such as what cause during rechargeable battery is used, electric current is excessive or temperature is high excessively, the capital causes damage to rechargeable battery, influences its useful life.

The circuit arrangement of at present rechargeable battery being protected has a lot, but its overall structure and function have much room for improvement.

Summary of the invention

In order to overcome above-mentioned defective, the utility model provides a kind of detecting voltage type secondary battery protective device, and this secondary battery protective device not only overcharges, low pressure, overcurrent protection, and can assess battery electric quantity, and is simultaneously low from power consumption.

The utility model for the technical scheme that solves its technical problem and adopt is: a kind of detecting voltage type secondary battery protective device, it comprises rechargeable battery set, the charging end, discharge end, charging controlling filed effect transistor, discharge controlling filed effect transistor, single-chip microcomputer, LED light, the voltage stabilizing chip, detecting resistance and current sense amplifier, described single-chip microcomputer and described rechargeable battery set, described current sense amplifier, described LED light, described charging controlling filed effect transistor, described discharge controlling filed effect transistor and described voltage stabilizing chip electrically connect, and described detecting resistance string is connected between described rechargeable battery set and the described ground wire; Described rechargeable battery set is converted to direct voltage by described voltage stabilizing chip with described charged battery voltage and offers described single-chip microcomputer, LED light and current sense amplifier; Described current sense amplifier is detected the voltage at described detecting resistance two ends and is messaging in described single-chip microcomputer, establish A/D converter in the described single-chip microcomputer, and the voltage analog signal of its reception is converted to is converted to current data by calculating after the digital signal and stores in the relevant register; The demonstration of the described LED light of described Single-chip Controlling; Described single-chip microcomputer is by controlling opening of described charging control field effect transistor and being connected and disconnection of the described charging end of closing control and described rechargeable battery set positive pole, and described single-chip microcomputer is controlled opening of field effect transistor and being connected and disconnection of the described discharge end of closing control and described rechargeable battery set positive pole by controlling described discharge.

As further improvement of the utility model, be provided with ten A/D converters in the described single-chip microcomputer, and test described rechargeable battery set voltage by described detecting resistance, described single-chip microcomputer shows rechargeable battery set voltage again by described LED light.

As further improvement of the utility model, described single-chip microcomputer obtains battery capacity according to rechargeable battery set voltage and charging and discharging currents, and the rechargeable battery capacity is analyzed acquisition capacity-voltage-to-current contrast relationship table.

As further improvement of the utility model, during the charging of described rechargeable battery set, when the voltage that detects described rechargeable battery set when described single-chip microcomputer was higher than overshoot protection point, the described charging controlling filed of described Single-chip Controlling effect transistor was closed.

As further improvement of the utility model, during the discharge of described discharge battery group, when the voltage that detects described discharge battery group when described single-chip microcomputer was lower than overshoot protection point, the described discharge controlling filed of described Single-chip Controlling effect transistor was closed.

As further improvement of the utility model, when the discharge of described rechargeable battery set, the discharging current that described single-chip microcomputer detects described rechargeable battery set is during greater than over-current protection point, and the described discharge controlling filed of described Single-chip Controlling effect transistor is closed.

As further improvement of the utility model, described LED light comprises working station indicator, charging indicator light and discharge indicator light.

The beneficial effects of the utility model are: have the indication of discharging and recharging, overcharge, low pressure, overcurrent, short-circuit protection, and function such as electric quantity metering, design simultaneously is light and handy, and sequencing control is simple to operate, and is low from power consumption.

Description of drawings

Fig. 1 is the utility model principle schematic.

In conjunction with the accompanying drawings, make the following instructions:

1---rechargeable battery set 2---charging end

3---discharge end 6---single-chip microcomputer

4---charging controlling filed effect transistor

5---discharge controlling filed effect transistor

7---LED light 8---voltage stabilizing chip

9---current sense amplifier Rs---detect resistance

10---ground wire 71---working station indicator

72---charging indicator lights 73---discharge indicator light

Embodiment

Below with reference to Fig. 1 the utility model is elaborated.

A kind of detecting voltage type secondary battery protective device, comprise rechargeable battery set 1, charging end 2, discharge end 3, charging controlling filed effect transistor 4, discharge controlling filed effect transistor 5, single-chip microcomputer 6, LED light 7, voltage stabilizing chip 8, detecting resistance R s and current sense amplifier 9, single-chip microcomputer and rechargeable battery set, current sense amplifier, LED light, charging controlling filed effect transistor, discharge controlling filed effect transistor and voltage stabilizing chip electrically connect, and the detecting resistance string is connected between rechargeable battery set and the ground wire 10; Rechargeable battery set is converted to direct voltage by the voltage stabilizing chip with charged battery voltage and offers single-chip microcomputer, LED light and current sense amplifier work use, the operating voltage of general single-chip microcomputer is 5V, and promptly the voltage of rechargeable battery set uses for single-chip microcomputer be converted to the direct current of 5V through the voltage stabilizing chip after; The voltage at current sense amplifier detecting detecting resistance two ends also is messaging in single-chip microcomputer, establishes A/D converter in the single-chip microcomputer, and the voltage analog signal of its reception is converted to is converted to current data by calculating after the digital signal and stores in the relevant register; The demonstration of Single-chip Controlling LED light; Single-chip microcomputer is by opening of control charging control field effect transistor and being connected and disconnection of closing control charging end and rechargeable battery set positive pole, and single-chip microcomputer is controlled opening of field effect transistor and being connected and disconnection of closing control discharge end and rechargeable battery set positive pole by the control discharge.

Be provided with ten A/D converters in the single-chip microcomputer, and test rechargeable battery set voltage by detecting resistance, single-chip microcomputer shows rechargeable battery set voltage again by LED light.

Single-chip microcomputer obtains battery capacity according to rechargeable battery set voltage and charging and discharging currents, and the rechargeable battery capacity is analyzed acquisition capacity-voltage-to-current contrast relationship table.In rechargeable battery set when charging,, when the voltage that detects rechargeable battery set when single-chip microcomputer was higher than overshoot protection point, the Single-chip Controlling controlling filed effect transistor that charges was closed.

In discharge battery group when discharge,, when the voltage that detects the discharge battery group when single-chip microcomputer was lower than overshoot protection point, the Single-chip Controlling controlling filed effect transistor that discharges was closed.

In rechargeable battery set when discharge,, the discharging current that detects rechargeable battery set when single-chip microcomputer is during greater than over-current protection point, and single-chip microcomputer controls discharge controlling filed effect transistor equally and cuts out.

LED light comprises working station indicator 71, charging indicator light 72 and discharge indicator light 73.LED light is shown according to data such as the charging and discharging state of the rechargeable battery set that detects, battery capacities by single-chip microcomputer.During the rechargeable battery set charging, the charging indicator light LED C1-4 circulation of charging indicator light 72 is lighted, and blanking time, 2S had 5 recurrent states, and the LED D1-4 of discharge indicator light 73 goes out; During the rechargeable battery set discharge, the LED C1-4 of charging indicator light 72 goes out, and the LED D1-4 of discharge indicator light 73 drives its on and off according to cell load change in voltage scope; When leaving standstill, the LED C1-4 of charging indicator light 72 goes out, and the LED D1-4 of discharge indicator light 73 goes out.As shown in table 1.

Table 1

In the utility model, as shown in Figure 1, there are five cycle of states in the LED C1-4 of charging indicator light 72, and be respectively: 1.LED C1-4 goes out; 2.LED C1 is bright; 3.LED C1-2 is bright; 4.LED C1-3 is bright; 5.LED C1-4 is bright.After battery is full of, LED C1-4 Chang Liang, behind the disconnection charger, LED C1-4 goes out.

In the utility model, as shown in Figure 1, the residual capacity of the LED D1-4 indication rechargeable battery set of discharge indicator light 73, the residual capacity of rechargeable battery set are according to cell voltage, charging and discharging currents contrast assessment, and table 2 is discharge indicator light 73 show state tables.

Table 2

The main electrical parameter of secondary battery protective device of the present utility model is as shown in table 3.

Sequence number	Project	Specification
			1	System voltage	15～40V
2	Dynamically power consumption is flowed	5～10mA
			3	The static state electric current	Less than 500uA

Table 3

Secondary battery protective device of the present utility model; can carry out functions such as over-charge protective, overcurrent protection, low-voltage variation, capacity detecting, short-circuit protection simultaneously to rechargeable battery; show by the operating state of LED light simultaneously rechargeable battery; function is many; the sequencing design; simple in structure, low from power consumption.

The utility model is not limited to the foregoing description, and many variation designs can also be arranged, and can carry out various combination, replacement etc. on demand, and the technical scheme that equal replacement of all employings or equivalent transformation form all drops on the protection range of this patent claim.

Claims

1. detecting voltage type secondary battery protective device, it is characterized in that: it comprises rechargeable battery set (1), charging end (2), discharge end (3), charging controlling filed effect transistor (4), discharge controlling filed effect transistor (5), single-chip microcomputer (6), LED light (7), voltage stabilizing chip (8), detecting resistance (Rs) and current sense amplifier (9), described single-chip microcomputer and described rechargeable battery set, described current sense amplifier, described LED light, described charging controlling filed effect transistor, described discharge controlling filed effect transistor and described voltage stabilizing chip electrically connect, and described detecting resistance string is connected between described rechargeable battery set and the described ground wire (10); Described rechargeable battery set is converted to direct voltage by described voltage stabilizing chip with described charged battery voltage and offers described single-chip microcomputer, LED light and current sense amplifier; Described current sense amplifier is detected the voltage at described detecting resistance two ends and is messaging in described single-chip microcomputer, establish A/D converter in the described single-chip microcomputer, and the voltage analog signal of its reception is converted to is converted to current data by calculating after the digital signal and stores in the relevant register; The demonstration of the described LED light of described Single-chip Controlling; Described single-chip microcomputer is by controlling opening of described charging control field effect transistor and being connected and disconnection of the described charging end of closing control and described rechargeable battery set positive pole, and described single-chip microcomputer is controlled opening of field effect transistor and being connected and disconnection of the described discharge end of closing control and described rechargeable battery set positive pole by controlling described discharge.

2. detecting voltage type secondary battery protective device according to claim 1; it is characterized in that: be provided with ten A/D converters in the described single-chip microcomputer; and test described rechargeable battery set voltage by described detecting resistance, described single-chip microcomputer shows rechargeable battery set voltage again by described LED light.

3. detecting voltage type secondary battery protective device according to claim 2; it is characterized in that: described single-chip microcomputer obtains battery capacity according to rechargeable battery set voltage and charging and discharging currents, and the rechargeable battery capacity is analyzed acquisition capacity-voltage-to-current contrast relationship table.

4. detecting voltage type secondary battery protective device according to claim 1; it is characterized in that: when described rechargeable battery set is charged; when the voltage that detects described rechargeable battery set when described single-chip microcomputer was higher than overshoot protection point, the described charging controlling filed of described Single-chip Controlling effect transistor was closed.

5. detecting voltage type secondary battery protective device according to claim 1; it is characterized in that: when described discharge battery group is discharged; when the voltage that detects described discharge battery group when described single-chip microcomputer was lower than overshoot protection point, the described discharge controlling filed of described Single-chip Controlling effect transistor was closed.

6. detecting voltage type secondary battery protective device according to claim 1; it is characterized in that: when described rechargeable battery set is discharged; the discharging current that described single-chip microcomputer detects described rechargeable battery set is during greater than over-current protection point, and the described discharge controlling filed of described Single-chip Controlling effect transistor is closed.

7. according to each described detecting voltage type secondary battery protective device in the claim 1 to 6, it is characterized in that: described LED light comprises working station indicator (71), charging indicator light (72) and discharge indicator light (73).