CN101626153A - Battery protection circuit and protection method thereof - Google Patents
Battery protection circuit and protection method thereof Download PDFInfo
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- CN101626153A CN101626153A CN200810135699A CN200810135699A CN101626153A CN 101626153 A CN101626153 A CN 101626153A CN 200810135699 A CN200810135699 A CN 200810135699A CN 200810135699 A CN200810135699 A CN 200810135699A CN 101626153 A CN101626153 A CN 101626153A
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Abstract
The invention provides a battery protection circuit and a protection method thereof, which are suitable for a rechargeable battery. The rechargeable battery is provided with a positive voltage pin, a negative voltage pin and a temperature induction pin, wherein an impedance value output by the temperature induction pin is changed along with the temperature of the rechargeable battery. The battery protection circuit comprises a temperature and voltage detection unit and a discharge unit, wherein the temperature and voltage detection unit judges the temperature of the rechargeable battery according to the impedance value output by the temperature induction pin. When the temperature of the rechargeable battery is greater than a preset temperature, the rechargeable battery is discharged by the discharge unit; when the voltage value output by the positive voltage pin is smaller than a preset voltage, the discharge unit stops discharging the rechargeable battery.
Description
Technical field
The invention relates to a kind of battery protecting circuit and guard method thereof, and particularly relevant for a kind of battery protecting method that under hot environment, delays cell expansion.
Background technology
But along with the progress with light and handy carried type electronic goods science and technology, every high-performance components of product also strides forward with the idealized target of " light, thin, short, little " mostly.Therefore battery in light weight, that volume is little, carried charge is high also just seems important especially.In addition, battery except volume little with the high manufacturing of reserve of electricity research and development, the battery protecting circuit that influences battery useful life and user's safety also is suitable important.For the circuit of battery protection, roughly all be to the battery in using generally, its charge and discharge status detection and protection for example overcharge monitoring, cross the protective circuit of putting monitoring, excess electric current (Excess current) and short circuit current (Short).
Overcharge detect protective circuit mainly be since battery in use; may cause overcharge (Overcharge) owing to user's mistake use; the generation battery temperature rises; and owing to the decomposition of electrolyte produces gas; its internal pressure is risen; and disengaging of inside battery chemical liquids and cause danger on fire and that break; therefore whether will detect the charging of battery by protective circuit excessive; with the deterioration in characteristics that prevents battery, on fire and break, and then guarantee user's fail safe.Crossing and putting the detection protective circuit then is to detect battery when discharge whether unusual situation to be arranged, to guarantee the useful life of battery.Excess electric current and short circuit current protective circuit take place under the unusual situation at operating current in order to this battery pack to be provided, and then will cut off being connected of battery and load, treat to return operate as normal after the unusual condition releasing, reach the function of protection.
Though these battery protecting circuits have monitoring and the function of protecting for the battery in the operation, but can't protect the battery in the non-use.For example, when mobile phone or camera are positioned in the car of high-temperature, though its inner battery not in user mode because the influence of high ambient temperature degree, battery has phenomenon unusual or expansion (swelling).Therefore cause the battery non-working condition under, the reduction in its battery useful life and cause user's danger.
Summary of the invention
In view of this, the invention provides a kind of battery protecting circuit, can slow down battery and be in the hot environment, the unusual expansion and the chemical variation of reversibility not take place, to improve the useful life of battery.
For reaching above-mentioned and other purpose, the present invention proposes a kind of battery protecting circuit, is applicable to rechargeable battery, and rechargeable battery has positive voltage pin, negative voltage pin and temperature sense pin.Wherein the resistance value exported of this temperature sense pin becomes with the temperature of rechargeable battery.This battery protecting circuit comprises temperature and voltage detection unit and discharge cell.Temperature and voltage detection unit are coupled to the positive voltage pin and the temperature sense pin of rechargeable battery, and judge the temperature of rechargeable battery according to the resistance value that the temperature sense pin is exported.Discharge cell then is coupled to positive voltage pin and temperature and voltage detection unit.
Wherein, when the temperature of rechargeable battery during greater than a preset temperature, discharge cell discharges to rechargeable battery.And if the magnitude of voltage that the positive voltage pin is exported is during less than one first preset value, then discharge cell stops rechargeable battery being discharged.
In an embodiment of the present invention, said temperature and voltage detection unit comprise bias unit and voltage detection unit.Bias unit is coupled between the voltage stabilizing pin and temperature sense pin that the rechargeable battery positive voltage changes out, and the resistance value that bias unit is exported according to the temperature sense pin of rechargeable battery is exported first voltage.Voltage detection unit then is coupled to the dividing potential drop pin in the bias unit, and the magnitude of voltage that voltage detection unit is exported according to first voltage and dividing potential drop pin is exported discharge signal to discharge cell.Wherein, when this first voltage during less than one second preset value, this discharge cell comes this rechargeable battery is discharged according to discharge signal.
In an embodiment of the present invention, above-mentioned bias unit comprises first resistance and second resistance.One end of first resistance is coupled to the voltage stabilizing pin that this positive voltage is changed out, and second resistance is coupled between the other end and this temperature sense pin of first resistance, and the shared node between first resistance and this second resistance is exported this first voltage.
In an embodiment of the present invention, above-mentioned voltage detection unit comprises voltage-sensor, bipolar transistor, first resistance and second resistance.Voltage-sensor is coupled to bias unit, and when this first voltage during less than this second preset value, an output voltage of voltage-sensor is a logic low potential.Bipolar transistor is coupled between the output and discharge cell of voltage-sensor, and it is in order to produce discharge signal.First resistance is coupled between the base stage and positive voltage pin of this bipolar transistor.One second resistance is coupled between the collector electrode and positive voltage pin of bipolar transistor (bipolarjunction transistor is called for short BJT).
In an embodiment of the present invention, above-mentioned bipolar transistor is a NPN transistor, and the collector electrode of this bipolar transistor is coupled to discharge cell, in order to produce this discharge signal, and the emitter of bipolar transistor is coupled to the output of this voltage-sensor, wherein when first voltage during less than this second preset value, then discharge signal is a logic low potential.In addition, the magnitude of voltage of being exported when the positive voltage pin is during less than this first preset value, and then discharge signal is a logic high potential.
In an embodiment of the present invention, above-mentioned discharge cell comprises: the switch and first resistance.One end of switch is coupled to this positive voltage pin, and resistance is coupled between the other end and earth terminal of switch.Wherein, when the temperature of rechargeable battery during greater than a preset temperature, then switch conduction to be discharging to rechargeable battery, and the magnitude of voltage of being exported when the positive voltage pin is during less than first preset value, and switch cuts out stopping rechargeable battery being discharged.In addition, the resistance of the usefulness that is used in the discharge cell discharging can use two resistance modes parallel with one another to realize, to improve the tolerances of discharging current and power.
In an embodiment of the present invention, above-mentioned switch is PMOS transistor (P channel metal oxidesemiconductor transistor), and its source electrode is coupled to the positive voltage pin, and drain electrode is coupled to first resistance, and grid then is coupled to discharge signal.
From another perspective, the present invention proposes a kind of battery protecting method in addition, and it is applicable to rechargeable battery, and rechargeable battery has positive voltage pin, negative voltage pin and temperature sense pin.The temperature that above-mentioned battery protecting method comprises the following steps: to detect rechargeable battery with when the temperature of rechargeable battery during greater than a preset temperature; rechargeable battery is discharged; and the magnitude of voltage of being exported when the positive voltage pin of rechargeable battery stops this rechargeable battery is discharged during less than a preset value
In an embodiment of the present invention, in the step of the temperature of above-mentioned this rechargeable battery of detection, also the resistance value of being exported according to this temperature sense pin is judged the temperature of this rechargeable battery.
In an embodiment of the present invention, the thermistor of the built-in negative temperature coefficient of above-mentioned rechargeable battery, thermistor is coupled to the temperature sense pin, and the output impedance of temperature sense pin is become with temperature.
In an embodiment of the present invention, a thermistor of the built-in positive temperature coefficient of above-mentioned rechargeable battery, thermistor is coupled to the temperature sense pin, and the output impedance of temperature sense pin is become with temperature.
Described according to the above embodiments with explanation; battery protecting circuit of the present invention and method thereof; can be at high temperature the battery of full voltage be discharged; and avoid the battery over-discharge can simultaneously; be subjected to high temperature and caused expansion, break and the chemical damage of reversibility not to slow down battery, and then prolong the useful life of battery and promote the fail safe of battery.
Description of drawings
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated, wherein:
Fig. 1 is the functional block diagram of battery protecting circuit according to an embodiment of the invention.
Fig. 2 is the circuit block diagram of battery protecting circuit according to an embodiment of the invention.
Fig. 3 is battery protecting method flow chart according to an embodiment of the invention.
Fig. 4 is the expansion rate bar chart of battery before the charging according to an embodiment of the invention.
Fig. 5 is the expansion rate bar chart of battery after the charging according to an embodiment of the invention
The main element symbol description:
100: battery protecting circuit
102: temperature and voltage detection unit
104: discharge cell
130: rechargeable battery
220: voltage detection unit
221: voltage-sensor
222: bipolar transistor
240: bias unit
241: voltage stabilizing element
250: switch
V+, V-, NTC: pin
R1, R2, R3: precision is regulated resistance
R4: switch controlling resistance
R5, R6: discharge resistance
R7: thermistor
FS: discharge signal
F: node
Vout: voltage detecting reaction output
S301～S305: step
Embodiment
First embodiment
Fig. 1 is the functional block diagram of battery protecting circuit according to an embodiment of the invention.Please refer to Fig. 1, battery protecting circuit 100 goes for rechargeable battery 130.Rechargeable battery 130 has positive voltage pin V+, negative voltage pin V-and temperature sense pin NTC.Battery protecting circuit 100 comprises temperature and voltage detection unit 102 and discharge cell 104.Temperature and voltage detection unit 102 are coupled to positive voltage pin V+ and temperature sense pin NTC.And discharge cell 104 is coupled to positive voltage pin V+ and temperature and sensing cell 102.The resistance value that the temperature sense pin NTC of rechargeable battery 130 is exported can change along with the temperature of rechargeable battery 130.So 102 resistance values of being exported according to temperature sense pin NTC of temperature and voltage detection unit are judged the temperature of rechargeable battery.Discharge cell 104 then discharges to rechargeable battery 130 according to the temperature detection result of temperature and voltage detection unit 102 and the voltage of rechargeable battery.
Because under the environment of high temperature, the rechargeable battery 130 of general voltage (about 3.7volt) is compared to the rechargeable battery 130 of full voltage (about 4.2volt), rechargeable battery 130 its speeds of expansion and the degree of general voltage are comparatively slow.Therefore, according to the battery behavior of above-mentioned rechargeable battery 130, at high temperature,, then help to reduce the speed of expansion of battery and avoid cell damage if can the rechargeable battery of full voltage be discharged.
So, the resistance value of being exported by temperature sense pin NTC when temperature and voltage detection unit 102 and the temperature that detects rechargeable battery 130 are during greater than a preset value, discharge cell 104 can discharge to rechargeable battery 130, make rechargeable battery 130 after discharging and become the state of unsaturation voltage, with slow down high temperature cause rechargeable battery 130 expansion, break and the not infringement of reversibility such as on fire.
Though discharge can slow down the bulking effect of rechargeable battery 130, discharge excessively also can cause rechargeable battery 130 permanent failures and shorten useful life.Therefore for fear of over-discharge can, the magnitude of voltage of being exported as positive voltage pin V+ is during less than first preset value, and when just the electric weight of rechargeable battery was less than a preset value, discharge cell 104 can stop rechargeable battery 130 is discharged.
Comprehensively above-mentioned, whether whether discharge cell 104 can discharge to rechargeable battery 130 according to temperature and voltage detection unit 102 detected temperature decisions, and stop to discharge according to electric weight (magnitude of voltage of the positive voltage pin V+) decision of rechargeable battery 130.Whereby, the rechargeable battery 130 of avoiding full voltage perhaps produces because of over-discharge can causes the problem of life-span impairment or permanent failure at high temperature because of expansion damages.
Above-mentioned discharge cell 104 usefulness determine whether temperature preset value that discharges and the voltage preset value that stops to discharge (for example 3.7 volts), can set according to environment for use and characteristic that circuit designers is considered rechargeable battery 130, and so-called hot environment can for example be parked in the sealed vehicle under outdoor that sunshine tans by the sun, its internal temperature is greater than 60 degree Celsius, even all possible to 100.
Next, illustrate that further the detailed circuit of each circuit box among Fig. 1 is made flowing mode with it, please refer to Fig. 2, Fig. 2 is the circuit block diagram of battery protecting circuit according to an embodiment of the invention.Battery protecting circuit 100 mainly comprises temperature and voltage detection unit 102 and discharge cell 104.Wherein, temperature and voltage detection unit 102 still comprise voltage detection unit 220 and bias unit 240.Voltage detection unit 220 couples bias unit 240 and positive voltage pin V+, and bias unit 240 then couples between the voltage stabilizing pin and temperature sense pin NTC that positive voltage V+ changes out.
Voltage-sensor 221 can be adjusted the current potential of voltage detecting reaction output Vout according to the voltage of node F, when the voltage of node F during less than preset value (temperature of expression rechargeable battery is greater than preset temperature), the voltage detecting reaction output Vout of voltage-sensor 221 is a logic low potential.Because precision is regulated resistance R 1 and is coupled between the base stage and positive voltage pin V+ of bipolar transistor 222, switch controlling resistance R4 is coupled between the collector electrode and positive voltage pin V+ of bipolar transistor 222, and the emitter of bipolar transistor 222 is coupled to the voltage detecting reaction output Vout of voltage-sensor 221.Therefore, when the voltage detecting reaction output output voltage that Vout produced of voltage-sensor 221 is logic low potential, potential difference between positive voltage pin V+ and the voltage detecting reaction output Vout can make bipolar transistor 222 conductings, and then produces lower current potential (pressure reduction that switch controlling resistance R4 is caused because electric current is flowed through) in the collector terminal of bipolar transistor 222.
The discharge signal FS that temperature and voltage detection unit 102 are exported is promptly formed by the collector voltage of bipolar transistor 222.When discharge signal FS reduces to electronegative potential because of bipolar transistor 222 conductings (temperature of expression rechargeable battery is greater than preset temperature), switch 250 in the discharge cell 104 (replacing with the PMOS transistor in the present embodiment) meeting conducting thereupon, rechargeable battery 130 promptly sees through discharge resistance R5, R6 and discharges.
In the present embodiment, the switch 250 in the discharge cell is the PMOS transistor, and discharge resistance R5 and R6 coupled in parallel are between the drain electrode and earth terminal GND of PMOS transistor 250.Discharge resistance R5 and R6 mainly provide the discharge path and the power consumption of rechargeable battery 130, and its quantity in parallel is not limited.Considering size, price and thermal diffusivity, present embodiment is the circuit that example realizes discharge cell with two 1/2W resistance.And the voltage-sensor 221 in temperature and voltage detection unit 102 can for example be the voltage-sensor of hat electronics corporation of middle section, and its model is R3112Q151A-TR-F.
In addition, because rechargeable battery has the restriction of certain cut-ff voltage (cut off voltage), and excessive discharge can cause the impairment in its useful life, even permanent failure.Therefore, present embodiment can design discharge cut-off voltage, and when the voltage of rechargeable battery (positive voltage pin V+) was lower than a preset value, temperature and voltage detection unit 102 can make discharge cell 104 stop rechargeable battery being discharged.Present embodiment can come design accuracy to regulate the resistance value (for example 91K) of resistance R 1 according to the required bias voltage of the internal resistance of bipolar transistor 222 and conducting.When the brownout of positive voltage pin V+, make discharge signal FS can transfer high potential to off switch 250, make discharge cell 104 stop rechargeable battery 130 is discharged.
In discharge process, the voltage quasi position of rechargeable battery 130 has the trend of successively decreasing downwards, present embodiment is promptly controlled the conducting state of bipolar transistor 222 whereby, and the collocation precision is regulated the resistance value of resistance R 1 and set the voltage level that bipolar transistor 222 is ended.When the voltage quasi position of rechargeable battery 130 is lower than preset value (for example 3.7V), bipolar transistor 222 just can end, and makes discharge signal FS transfer high potential (level off to positive voltage pin V+ current potential) to.At this moment, switch 250 can cut out thereupon and stop rechargeable battery being discharged.
Comprehensively above-mentioned, in the present embodiment, when the temperature of rechargeable battery 130 during greater than preset temperature, the discharge signal FS that temperature and voltage detection unit 102 are exported can transfer electronegative potential (because of bipolar transistor 222 conductings) to, at this moment, 104 pairs of rechargeable batteries 130 of discharge cell discharge.In discharge process, when the voltage of rechargeable battery 130 was lower than a preset value, discharge signal FS can transfer high potential (because of bipolar transistor 222 ends) to, and at this moment, discharge cell 104 stops rechargeable battery 130 is discharged.
In addition, it should be noted that, the thermistor R7 of rechargeable battery 130 is coupled to temperature sense pin NTC, and it can be negative temperature coefficient (Negative Temperature Coefficient, NTC) or positive temperature coefficient (Positive Temperature Coefficient, PTC) thermistor is example at present embodiment with the thermistor of negative temperature coefficient.The circuit of said temperature and voltage detection unit 102 and discharge cell 104 only is one embodiment of the invention, the present invention is not exceeded with the circuit of above-mentioned Fig. 2, the present technique field has knows that usually the knowledgeable is after via exposure of the present invention, should know all the other execution modes of foregoing circuit easily by inference, not add tired stating at this.
Second embodiment
Comprehensively above-mentioned, the present invention can summarize a kind of battery protecting method.Fig. 3 is battery protecting method flow chart according to an embodiment of the invention.Please refer to Fig. 3, at first as described in the step S301, temperature and voltage detection unit detect the temperature of rechargeable battery according to the resistance value of the temperature sensing pin output of rechargeable battery.Then as described in the step S302, whether the temperature of judging rechargeable battery greater than a preset temperature, if temperature was not greater than preset temperature (what just step 302 indicated " deny "), and repeating step S301 then, the temperature of continuation detection rechargeable battery.
On the other hand, if during execution in step 302, the temperature of rechargeable battery is during greater than preset temperature, (what just step 302 indicated " be "), then shown in step 303, discharge cell then discharges to rechargeable battery.Next as described in the step 304, the magnitude of voltage of judging rechargeable battery (output of positive voltage pin) whether less than the temperature of a preset value or rechargeable battery less than preset temperature, this step is the damage that causes rechargeable battery for fear of over-discharge can.Therefore, the magnitude of voltage of being exported when the positive voltage pin is during as yet less than preset value (what just step 304 indicated " deny "), then repeating step S303 continues rechargeable battery is discharged.If the magnitude of voltage that the positive voltage pin is exported is during less than preset value or the temperature of rechargeable battery during less than preset temperature (what just step 304 indicated " be "); then discharge cell stops rechargeable battery being discharged; repeat battery protecting method step S301～S305 then, continue to detect and the protection rechargeable battery.
The present technique field has knows the exposure of the knowledgeable via above-mentioned first embodiment usually, should know all the other details of present embodiment by inference, does not add tired stating at this.
The 3rd embodiment
Table 1 be 25 ℃ with 85 ℃ under cell thickness measurement figure.Please refer to table 1, table 1 is divided into three items with the state of battery, is respectively and does not use cell thickness that circuit of the present invention and ambient temperature are (25 ℃) under the room temperature, do not use circuit of the present invention and battery to be placed in ambient temperature be 85 ℃ of following cell thickness of eight hours that to be placed in ambient temperature be 85 ℃ of following cell thickness of eight hours with using circuit of the present invention and battery.
Table 1
And under three different conditions, measure battery (3.8V) and the thickness of (4.2V) afterwards that charges before charging respectively.Can find by three the actual measurements of battery under different conditions in the table 1, when temperature is risen to 85 ℃ of high temperature by room temperature (25 ℃), the battery of using circuit of the present invention is arranged compared to the battery of not using circuit of the present invention, the thickness swelling amount of the battery of application circuit of the present invention is smaller really.Specifically, the battery under state after the charging, the thickness swelling amount that its battery raises and increases with temperature compared to the battery of not using circuit of the present invention, has its thickness swelling amount of battery of using circuit of the present invention significantly to reduce many.Next just clearly present the slow down degree of circuit of the present invention for the thickness swelling amount of battery with expansion rate numerical value.
The expansion rate numerical tabular of table 2 for being calculated according to table 1 cell thickness.Please refer to table 2, table 2 presented be with the cell expansion rate be divided into battery before charging with charging after two states under, come accounting temperature from 25 ℃ of expansion rates that rise to 85 ℃.In addition, more be divided in the table 2 battery before using circuit of the present invention with use after the expansion rate of cell thickness, and expansion rate reduction value (using the difference of expansion rate after the present invention's electricity rate).Can clearly understand degrees of expansion that circuit of the present invention is reached by expansion rate reduction value slows down and the effect that descends.
Table 2
At first; we observe the expansion rate reduction value before the battery charge earlier; by battery one; battery two can be found with the expansion rate reduction value of battery three; though battery be recharge preceding or the charging after state; use circuit of the present invention that the expansion rate of battery is descended; this be since the ambient temperature of battery greater than preset temperature; so can start battery protecting circuit of the present invention; to battery discharge; and because the magnitude of voltage (3.8V) before its charging is not less than predeterminated voltage; so battery protecting circuit still can discharge to battery before charging, therefore can clearly understand the effect of circuit of the present invention according to the reduction of expansion rate.Then, we observe the expansion rate reduction value of charging back battery again, expansion rate reduction value compared to the preceding battery of charging, the expansion rate reduction value of charging back battery is bigger, this is because charging back and do not use the battery of circuit of the present invention, its expansion issues that caused by temperatures involved is quite serious, makes charging back battery after using circuit of the present invention, its expansion issues of reduction that can be a large amount of.
Fig. 4 is the expansion rate bar chart of battery before the charging according to an embodiment of the invention, and Fig. 5 is the expansion rate bar chart of battery after the charging according to an embodiment of the invention.Fig. 4 and Fig. 5 are the bar chart that utilizes the expansion rate of table 2 to illustrate.Please refer to Fig. 4, is example with battery one, and the battery one before the charging is not using under the situation of this circuit, expansion rate is 5.78%, and after using circuit of the present invention, its expansion rate is 4.49, so the battery one before the charging is after using circuit of the present invention, expansion reduction value is 1.29%.Please refer to Fig. 5, the battery one of charging back (4.2V) is not before using circuit of the present invention, and it is subjected to the influence of 85 ℃ of high temperature, make expansion rate height to 11.28%, and after using circuit of the present invention, expansion rate just drops to 5.74%, so its expansion rate reduction value is 5.54%.Please merge with reference to Fig. 4 and Fig. 5; expansion rate by battery one, two, three can be found; battery protecting circuit of the present invention has the cell expansion rate under the high temperature and significantly slows down effect, and more can reduce and the problem of slowing down its expansion the battery after the charging especially.
Comprehensively above-mentioned; battery protecting circuit provided by the present invention and method thereof can be come battery discharge according to the temperature of battery; make battery under non-working condition, also can avoid expanding and unusual damage situation, and then promote the useful life of battery and promote the fail safe that the user uses battery.
Though the present invention discloses as above with preferred embodiment; right its is not in order to qualification the present invention, any those skilled in the art, without departing from the spirit and scope of the present invention; when can doing a little modification and perfect, so protection scope of the present invention is when with being as the criterion that claims were defined.
Claims (15)
1. battery protecting circuit; be applicable to a rechargeable battery; this rechargeable battery has a positive voltage pin, a negative voltage pin and a temperature sense pin, and wherein the resistance value exported of this temperature sense pin becomes with the temperature of this rechargeable battery, and this battery protecting circuit comprises:
One temperature and voltage detection unit are coupled to this positive voltage pin and this temperature sense pin, and judge the temperature of this rechargeable battery according to this resistance value that this temperature sense pin is exported; And
One discharge cell is coupled to this positive voltage pin and this temperature and voltage detection unit;
Wherein, when the temperature of this rechargeable battery during greater than a preset temperature, this discharge cell discharges to this rechargeable battery, and the magnitude of voltage of being exported when this positive voltage pin is during less than one first preset value, and this discharge cell stops this rechargeable battery is discharged.
2. battery protecting circuit as claimed in claim 1 is characterized in that, this temperature and voltage detection unit comprise:
One bias unit is coupled between this positive voltage pin and this temperature sense pin, exports one first voltage according to this resistance value that this temperature sense pin is exported; And
One voltage detection unit is coupled to this bias unit and this positive voltage pin, according to the magnitude of voltage that this first voltage and this positive voltage pin are exported, exports a discharge signal to this discharge cell;
Wherein, when this first voltage during less than one second preset value, this discharge cell discharges to this rechargeable battery according to this discharge signal.
3. battery protecting circuit as claimed in claim 2 is characterized in that, this bias unit comprises:
One voltage stabilizing element, an end of this voltage stabilizing element is coupled to this positive voltage pin;
One first resistance, an end of this first resistance is coupled to this voltage stabilizing element pin; And
One second resistance is coupled between the other end and this temperature sense pin of this first resistance;
Wherein, the shared node between this first resistance and this second resistance is exported this first voltage.
4. battery protecting circuit as claimed in claim 2 is characterized in that, this voltage detection unit comprises:
One voltage-sensor is coupled to this bias unit, and when this first voltage during less than this second preset value, an output voltage of this voltage-sensor is a logic low potential;
One bipolar transistor is coupled between the output and this discharge cell of this voltage-sensor, in order to produce this discharge signal; And
One first resistance is coupled between the base stage and this positive voltage pin of this bipolar transistor; And
One second resistance is coupled between the collector electrode and this positive voltage pin of this bipolar transistor.
5. battery protecting circuit as claimed in claim 4; it is characterized in that; this bipolar transistor is a NPN transistor; and this collector electrode of this bipolar transistor is coupled to this discharge cell; in order to produce this discharge signal; one emitter of this bipolar transistor is coupled to the output of this voltage-sensor; wherein when this first voltage during less than this second preset value; this discharge signal is a logic low potential; the magnitude of voltage of being exported when this positive voltage pin is during less than this first preset value, and this discharge signal is a logic high potential.
6. battery protecting circuit as claimed in claim 1 is characterized in that, this discharge cell comprises:
One switch, an end of this switch is coupled to this positive voltage pin; And
One first resistance is coupled between the other end and an earth terminal of this switch;
Wherein, when the temperature of this rechargeable battery during greater than a preset temperature, this switch conduction to be discharging to this rechargeable battery, and the magnitude of voltage of being exported when this positive voltage pin is during less than one first preset value, and this switch cuts out stopping this rechargeable battery is discharged.
7. battery protecting circuit as claimed in claim 1 is characterized in that, this discharge cell comprises:
One second resistance is parallel to this first resistance.
8. battery protecting circuit as claimed in claim 6; it is characterized in that this switch is a PMOS transistor, the transistorized one source pole of this PMOS is coupled to this positive voltage pin; the transistorized drain electrode of this PMOS is coupled to this first resistance, and grid then is coupled to discharge signal.
9. battery protecting circuit as claimed in claim 1 is characterized in that, a thermistor of the built-in negative temperature coefficient of this rechargeable battery, this thermistor are coupled to this temperature sense pin, and the output impedance of this temperature sense pin is become with temperature.
10. battery protecting circuit as claimed in claim 1 is characterized in that, a thermistor of the built-in positive temperature coefficient of this rechargeable battery, this thermistor are coupled to this temperature sense pin, and the output impedance of this temperature sense pin is become with temperature.
11. battery protecting circuit as claimed in claim 1 is characterized in that, this negative voltage pin is coupled to an earth terminal.
12. a battery protecting method is applicable to a rechargeable battery, this rechargeable battery has a positive voltage pin, a negative voltage pin and a temperature sense pin, and this battery protecting method comprises:
Detect the temperature of this rechargeable battery;
When the temperature of this rechargeable battery during, this rechargeable battery is discharged greater than a preset temperature; And
The magnitude of voltage of being exported when this positive voltage pin of this rechargeable battery stops this rechargeable battery is discharged during less than a preset value.
13. battery protecting method as claimed in claim 12 is characterized in that, in the step of the temperature that detects this rechargeable battery, more the resistance value of being exported according to this temperature sense pin is judged the temperature of this rechargeable battery.
14. battery protecting method as claimed in claim 12; it is characterized in that; one thermistor of the built-in negative temperature coefficient of this rechargeable battery, this thermistor are coupled to this temperature sense pin, and the output impedance that makes this temperature sense pin becomes with the temperature of this rechargeable battery.
15. battery protecting method as claimed in claim 12; it is characterized in that; one thermistor of the built-in positive temperature coefficient of this rechargeable battery, this thermistor are coupled to this temperature sense pin, and the output impedance that makes this temperature sense pin becomes with the temperature of this rechargeable battery.
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| CN2008101356997A CN101626153B (en) | 2008-07-08 | 2008-07-08 | Battery protection circuit and protection method thereof |
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| CN2008101356997A CN101626153B (en) | 2008-07-08 | 2008-07-08 | Battery protection circuit and protection method thereof |
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| CN101626153B CN101626153B (en) | 2011-11-30 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102136741A (en) * | 2010-01-22 | 2011-07-27 | 深圳富泰宏精密工业有限公司 | Power supply device and discharging method thereof |
| CN103904379A (en) * | 2012-12-27 | 2014-07-02 | 联想(北京)有限公司 | Method for protecting battery and electronic device |
| CN107219021A (en) * | 2016-03-22 | 2017-09-29 | 罗伯特·博世有限公司 | A kind of method and apparatus for detecting battery temperature |
| CN107863073A (en) * | 2017-12-22 | 2018-03-30 | 深圳Tcl新技术有限公司 | LCOALDIMMING backlight drive circuits and display device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100193736B1 (en) * | 1996-09-17 | 1999-06-15 | 윤종용 | Battery pack with battery protection |
| JP3380766B2 (en) * | 1999-03-18 | 2003-02-24 | 富士通株式会社 | Protection method, control circuit, and battery unit |
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2008
- 2008-07-08 CN CN2008101356997A patent/CN101626153B/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136741A (en) * | 2010-01-22 | 2011-07-27 | 深圳富泰宏精密工业有限公司 | Power supply device and discharging method thereof |
| CN103904379A (en) * | 2012-12-27 | 2014-07-02 | 联想(北京)有限公司 | Method for protecting battery and electronic device |
| CN107219021A (en) * | 2016-03-22 | 2017-09-29 | 罗伯特·博世有限公司 | A kind of method and apparatus for detecting battery temperature |
| CN107863073A (en) * | 2017-12-22 | 2018-03-30 | 深圳Tcl新技术有限公司 | LCOALDIMMING backlight drive circuits and display device |
| CN107863073B (en) * | 2017-12-22 | 2022-07-29 | 深圳Tcl新技术有限公司 | LCOALDIMMING backlight driving circuit and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101626153B (en) | 2011-11-30 |
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