CN202059162U

CN202059162U - Charging battery protecting device

Info

Publication number: CN202059162U
Application number: CN2011201143485U
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 charging battery protecting device, comprising a charging battery pack, a charging end, a discharging end, a single chip microcomputer, a battery management chip, an LED (light-emitting diode) indicating lamp, a charging control field effect transistor, a discharging control field effect transistor and a voltage-stabilizing chip, wherein the charging battery pack converts the voltage of charging batteries into direct-current voltage by the voltage-stabilizing chip and supplies the direct-current voltage for the single chip microcomputer and the battery management chip for working; the single chip microcomputer controls the display of the LED indicating lamp and controls the connection and the disconnection of the charging end and the positive electrode of the charging battery pack by controlling the switching on and switching off of the charging control field effect transistor; and the single chip microcomputer controls the connection and the disconnection of the discharging end and the positive electrode of the charging battery pack by controlling the switching on and switching off of the discharging control field effect transistor. The charging battery protecting device has the advantages that the functions are more, the programmed design is adopted, the structure is simple and the self power consumption is low.

Description

The secondary battery protective device

Technical field

The utility model relates to a kind of secondary battery protective device, relates in particular to a kind of multi-functional devices such as rechargeable battery capacity analysis, battery protection, battery indication that have.

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

The utility model has proposed a kind of secondary battery protective device at the problem that existing overall structure of existing secondary battery protective device and function in the prior art remain to be improved.

The utility model for the technical scheme that solves its technical problem and adopt is:

A kind of secondary battery protective device comprises rechargeable battery set; The charging end; Discharge end; Single-chip microcomputer; Battery management chip; LED light; Charging controlling filed effect transistor; Discharge controlling filed effect transistor; The voltage stabilizing chip;

Described single-chip microcomputer and described battery management chip, described LED light, described charging controlling filed effect transistor, discharge controlling filed effect transistor and described voltage stabilizing chip electrically connect, described rechargeable battery set is converted to direct voltage by the voltage stabilizing chip with described charged battery voltage and offers single-chip microcomputer and battery management chip work use, the demonstration of the described LED light of described Single-chip Controlling, described single-chip microcomputer is by controlling opening of described charging controlling filed effect transistor and being connected and disconnection of the positive pole of the described charging end of closing control and described rechargeable battery set, and described single-chip microcomputer is by controlling opening of described discharge controlling filed effect transistor and being connected and disconnection of the positive pole of the described discharge end of closing control and described rechargeable battery set.

Preferably, described single-chip microcomputer is by carrying out exchanges data with described battery management chip, and the signal that the voltage digital signal of described rechargeable battery set is discerned by single-chip microcomputer is stored in the relevant register, carries out detecting voltage.

Preferably, there is the temperature detecting thermistor described battery management chip inside, in corresponding registers, single-chip microcomputer reads the temperature information that is stored in the described battery management chip corresponding registers by the I2C communications protocol, carries out temperature detecting with the storage that detects.

Preferably, also be provided with a capacity sense terminal between the negative pole of described rechargeable battery set and the ground wire, described battery management chip is by the described capacity sense terminal voltage of detecting, charging and discharging currents, pass through charge and discharge cycles, metering battery total capacity, current capacity, cycle-index, and detecting data is stored in the corresponding registers, carry out the capacity detecting.

Preferably, described single-chip microcomputer reads the capacity data of rechargeable battery set by the I2C communications protocol, and described single-chip microcomputer can carry out zero clearing, write operation to the chip that stores capacity data.

Preferably, described battery management chip obtains the voltage of described capacity sense terminal, and by passing to described single-chip microcomputer after the internal integral circuit conversion, described single-chip microcomputer shows capacity data again by described LED light.

Preferably, 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 over-charge protective point, the described charging of described Single-chip Controlling was controlled field effect transistor and is closed.

Preferably, during the discharge of described rechargeable battery set, be lower than when putting protection point or discharging current greater than over-current protection point when described single-chip microcomputer detects described rechargeable battery set cell voltage, the described discharge control of described Single-chip Controlling field effect transistor is closed.

Preferably, when described rechargeable battery set charge or discharge, described single-chip microcomputer detects ambient temperature when being higher than overheat protector point, and described single-chip microcomputer cuts out described charging control field effect transistor or described discharge control field effect transistor.

Preferably, described LED light comprises working station indicator, charging indicator light and discharge indicator light.

The beneficial effects of the utility model are: function is many, and the sequencing design is simple in structure, and is low from power consumption.

Description of drawings

Fig. 1 is the electrical block diagram of the utility model preferred embodiment.

Embodiment

Below with reference to Fig. 1 preferred embodiment of the present utility model is elaborated.

Be illustrated in figure 1 as the electrical block diagram of the utility model preferred embodiment, secondary battery protective device of the present utility model comprises rechargeable battery set 10; Charging end 20; Discharge end 30; Single-chip microcomputer 40; Battery management chip 50; LED light 60; Charging controlling filed effect transistor 70; Discharge controlling filed effect transistor 80; Voltage stabilizing chip 90;

Single-chip microcomputer 40 and battery management chip 50, LED light 60, charging controlling filed effect transistor 70, discharge controlling filed effect transistor 80 and voltage stabilizing chip 90 electrically connect, rechargeable battery set 10 is for its work use by voltage stabilizing chip 90 behind single-chip microcomputer 40 and the needed direct voltage of battery management chip 50 work with the voltage transitions of rechargeable battery set 10, general single-chip microcomputer 40 operating voltages are 5V, be to use for single-chip microcomputer 40 work the voltage of rechargeable battery set 10 is converted to the direct voltage of 5V through voltage stabilizing chip 90 after, the demonstration of single-chip microcomputer 40 control LED light 60, single-chip microcomputer 40 is by opening of control charging controlling filed effect transistor 70 and being connected and disconnection of the positive pole of closing control charging end 20 and rechargeable battery set 10, and single-chip microcomputer 40 is by control discharge opening of controlling filed effect transistor 80 and being connected and disconnection of the positive pole of closing control discharge end 30 and rechargeable battery set 10.

As shown in Figure 1, the anodal of rechargeable battery set 10 directly links to each other with single-chip microcomputer simultaneously, single-chip microcomputer obtains the data of its voltage, single-chip microcomputer 40 is by the communications protocol of I2C, carry out exchanges data with battery management chip 50, the signal that the voltage digital signal of rechargeable battery set 10 is discerned by single-chip microcomputer is stored in the relevant register, carries out detecting voltage.

There is temperature detecting thermistor (not shown) battery management chip 50 inside, the temperature detecting thermistor with the storage that detects in corresponding registers, single-chip microcomputer 40 reads the temperature data that is stored in battery management chip 50 corresponding registers by the I2C communications protocol, carries out temperature detecting.

Also be provided with a capacity sense terminal 91 between the negative pole of rechargeable battery set 10 and the ground wire GND, battery management chip 50 is by voltage, the charging and discharging currents of detecting capacity sense terminal 91, pass through charge and discharge cycles, metering battery total capacity, current capacity, cycle-index, and detecting data is stored in the corresponding registers, carry out the capacity detecting.

Single-chip microcomputer 40 reads the capacity data of rechargeable battery set 10 by the I2C communications protocol, operation such as simultaneously, single-chip microcomputer 40 can carry out zero clearing to the chip that stores capacity data, write.

Battery management chip 50 obtains the voltage of capacity sense terminal 91, and by passing to single-chip microcomputer 40 after the internal integral circuit conversion, single-chip microcomputer 40 shows capacity data again by LED light 60.

During rechargeable battery set 10 chargings; the charging control field effect transistor 70 of single-chip microcomputer 40 controls is opened; charging end 20 electrically connects with rechargeable battery set 10; this moment is constantly to rechargeable battery set 10 operation of charging; the voltage of rechargeable battery set 10 raises gradually; when the voltage that detects rechargeable battery set 10 when single-chip microcomputer 40 is higher than the voltage of over-charge protective point of inner setting; single-chip microcomputer 40 control charging control field effect transistor 70 are closed it; make charging end 20 and rechargeable battery set 10 disconnect; charging finishes; thereby reach the purpose that prevents rechargeable battery set 10 overshoots, play the effect of protection rechargeable battery 10.

During rechargeable battery set 10 discharges; the discharge control field effect transistor 80 of single-chip microcomputer 40 controls is opened; discharge end 30 electrically connects with rechargeable battery set 10; this moment is constantly to rechargeable battery set 10 operation of discharging; the voltage of rechargeable battery set 10 reduces gradually; when single-chip microcomputer detects mistake that the rechargeable battery set cell voltage is lower than inner setting when putting the voltage of protection point; when perhaps single-chip microcomputer detects discharging current greater than the electric current of the over-current protection point of inner setting; single-chip microcomputer 40 control discharge control field effect transistor 80 are closed it; make discharge end 30 and rechargeable battery set 10 disconnect; discharge finishes; put or the purpose of overcurrent thereby reach to prevent from rechargeable battery set 10 crossed, play the effect of protection rechargeable battery 10.

In addition; no matter during rechargeable battery set 10 charge or discharge; as long as detect ambient temperature when being higher than the temperature of overheat protector point of inner setting; single-chip microcomputer 40 will cut out corresponding charging control field effect transistor 70 or discharge control field effect transistor 80, thereby it is to preventing the too high infringement that rechargeable battery set 10 is caused of the temperature that causes because of charge or discharge.When outside line is short-circuited or other reasons such as breaking out of fire when causing temperature to raise, single-chip microcomputer 40 can cut out corresponding charging control field effect transistor 70 or discharge control field effect transistor 80 equally, realizes overheat protector.

LED light 60 comprises working station indicator 61, charging indicator light 62 and discharge indicator light 63.LED light 60 is shown according to data such as the charging and discharging state of the rechargeable battery set 10 that detects, battery capacities by single-chip microcomputer 40.During rechargeable battery set 10 chargings, the LED C1 of charging indicator light 62～4 circulations are lighted, and blanking time, 2S had 5 recurrent states, go out in LED D1～4 of discharge indicator light 63; During rechargeable battery set 10 discharges, go out in LED C1～4 of charging indicator light 62, and LED D1～4 of discharge indicator light 63 are according to the battery remaining power on and off; When static, go out in LED C1～4 of charging indicator light 62, goes out in LED D1～4 of discharge indicator light 63; Rechargeable LED D1～4 use capacity to be benchmark with voltage according to the battery remaining power on and off for the first time, do charge and discharge cycles after, be benchmark with the actual test capacity that detects.As shown in table 1.

Table 1

In the utility model, as shown in Figure 1, there are five cycle of states in the LEDC1 of charging indicator light 62～4, and being respectively: goes out in 1.LED C1～4; 2.LEDC1 it is bright; 3.LED C1～2 are bright; 4.LED C1～3 are bright; 5.LED C1～4 are bright.After battery is full of, LED C1～4 Chang Liang, behind the disconnection charger, go out in LED C1～4.

In the utility model, as shown in Figure 1, the residual capacity of the LEDD1 of discharge indicator light 63～4 indication rechargeable battery set 10, the residual capacity of rechargeable battery set is judged according to cell voltage, data are obtained after need doing capacity analysis to battery, and table 2 is discharge indicator light 63 show state tables.

Sequence number	Battery remaining power	The LED indicating status
			1	＝100％C _M	LED D1～4 are bright
2	75％-99％	LED D1～3 are bright
			3	50％-74％	LED D1～2 are bright
4	15％-49％	LED D1 is bright
			5	＜14％	Go out in LED D1～4

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 overshoot protection, overcurrent protection, cross and put functions such as protection, capacity detecting, overheat protector rechargeable battery simultaneously; 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. secondary battery protective device, it is characterized in that: it comprises rechargeable battery set; The charging end; Discharge end; Single-chip microcomputer; Battery management chip; LED light; Charging controlling filed effect transistor; Discharge controlling filed effect transistor; The voltage stabilizing chip;

2. secondary battery protective device according to claim 1; it is characterized in that: described single-chip microcomputer is by carrying out exchanges data with described battery management chip; the signal that the voltage digital signal of described rechargeable battery set is discerned by single-chip microcomputer is stored in the relevant register, carries out detecting voltage.

3. secondary battery protective device according to claim 1; it is characterized in that: there is the temperature detecting thermistor described battery management chip inside; with the storage that detects in corresponding registers; single-chip microcomputer reads the temperature information that is stored in the described battery management chip corresponding registers by the I2C communications protocol, carries out temperature detecting.

4. secondary battery protective device according to claim 1; it is characterized in that: also be provided with a capacity sense terminal between the negative pole of described rechargeable battery set and the ground wire; described battery management chip is by the described capacity sense terminal voltage of detecting, charging and discharging currents; pass through charge and discharge cycles; metering battery total capacity, current capacity, cycle-index; and detecting data is stored in the corresponding registers, carry out the capacity detecting.

5. secondary battery protective device according to claim 4 is characterized in that: described single-chip microcomputer reads the capacity data of rechargeable battery set by the I2C communications protocol, and described single-chip microcomputer can carry out zero clearing, write operation to the chip that stores capacity data.

6. secondary battery protective device according to claim 4; it is characterized in that: described battery management chip obtains the voltage of described capacity sense terminal; by passing to described single-chip microcomputer after the internal integral circuit conversion, described single-chip microcomputer shows capacity data again by described LED light.

7. 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 over-charge protective point, the described charging control of described Single-chip Controlling field effect transistor was closed.

8. secondary battery protective device according to claim 1; it is characterized in that: when described rechargeable battery set is discharged; be lower than when putting protection point or discharging current greater than over-current protection point when described single-chip microcomputer detects described rechargeable battery set cell voltage, the described discharge control of described Single-chip Controlling field effect transistor is closed.

9. secondary battery protective device according to claim 1; it is characterized in that: when described rechargeable battery set charge or discharge; described single-chip microcomputer detects ambient temperature when being higher than overheat protector point, and described single-chip microcomputer cuts out described charging control field effect transistor or described discharge control field effect transistor.

10. according to each described secondary battery protective device of claim 1-9, it is characterized in that: described LED light comprises working station indicator, charging indicator light and discharge indicator light.