CN101106283A - Method for charging battery of portable handheld device - Google Patents
Method for charging battery of portable handheld device Download PDFInfo
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- CN101106283A CN101106283A CNA2007101300272A CN200710130027A CN101106283A CN 101106283 A CN101106283 A CN 101106283A CN A2007101300272 A CNA2007101300272 A CN A2007101300272A CN 200710130027 A CN200710130027 A CN 200710130027A CN 101106283 A CN101106283 A CN 101106283A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention provides a battery charge method for portable hand-held equipment, which comprises that the battery with normal voltage scope is charged with a plurality of charging current grades according to the temperature change and the prior electric quantity of the battery; when the charging voltage is more than a first voltage threshold value, the constant voltage charge is carried out, while, when the charging current is less than the first voltage threshold value, the charge is over. Therefore, the invention is capable of fast charging with higher current under the condition that the electric quantity of the battery is lower to enhance the charge efficiency.
Description
Technical field
The present invention relates to method for charging batteries, more specifically, relate to the method that the battery that is integrated in the handheld devices such as mobile phone is charged.
Background technology
Handheld devices such as mobile phone need a kind of battery of high-energy-density as power supply; generally all can use lithium ion battery; because lithium ion is a kind of very active metal; so we are when charging to it; need strict control its voltage and temperature, when charging, also will keep safe charging clocklike.The charging management method of battery of mobile phone mainly contained for three steps at present; as shown in Figure 1; (1) when the minimal protection voltage of voltage less than battery; adopt the preliminary filling of little electric current, begin normal constant current charge after (2) voltage is normal, change constant voltage charge into after being charged to 4.2V; (3) behind the constant voltage charge; electric current can reduce gradually along with the increase of battery capacity, when electric current is enough little, charging will by.Played a protective effect in this medium temperature, when temperature arrives predetermined maximum value, charging will end.Like this environment of high temperature and large current charge temperature rise very fast in, the protection of temperature is not very desirable just.
Summary of the invention
Consider the problems referred to above and make the present invention, for this reason, main purpose of the present invention is that providing a kind of is the method for the battery charge of portable handheld device, and it comprises:
Step S102 for the battery that is in the normal voltage scope, has electric weight now, charges with a plurality of charging current grades according to variations in temperature, battery; And
Step S104, when charging voltage is carried out constant voltage charge during greater than first voltage threshold, and when charging current complete charge during less than first current threshold.
The charging current grade can comprise quick constant current charge, normal current charging and half current charges.
The duty of pulse-width modulation waveform that can be by adjusting portable handheld device is recently adjusted the charging current grade.
Before step S102, can also comprise: compare cell voltage and minimal protection voltage,, then carry out precharge if cell voltage is lower than the normal voltage scope.
Step S102 can comprise: detect the electric weight of battery, if electric weight less than 50%, is then carried out quick constant current charge, and the variations in temperature of detection battery, if variations in temperature, is then carried out the normal current charging greater than first temperature threshold; If electric weight, is then carried out the normal current charging greater than 50%, and detect the variations in temperature of battery, if variations in temperature greater than second temperature threshold, is then carried out half current charges.
Fast the twice that constant current charge can normal current is to battery charge.
Half current charges can normal current half to battery charge.
Step S104 comprises: if detected battery temperature greater than the 3rd temperature threshold stop the charging.
Per 2 seconds once sampling of battery temperature, and battery temperature is stored in the array.
Battery temperature can obtain by thermistor.
Adjust current class by variation of temperature and the initial electric weight of battery, make the battery surface temperature in a stable scope, under temperature is subjected to better controlled, can when battery electric quantity is low, carry out quick charge with bigger electric current, improved charge efficiency.Be suitable for the quick charge of high capacity cell.
Other features and advantages of the present invention will be set forth in the following description, and, partly from specification, become apparent, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of being write, claims and accompanying drawing.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used from explanation the present invention with embodiments of the invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the curve chart of the battery charging process of existing portable handheld device;
Fig. 2 shows the flow chart according to the method for the battery charge for portable handheld device of the present invention;
Fig. 3 is the curve chart according to the battery charging process for portable handheld device of the present invention; And
Fig. 4 is an adjustment charging current grade schematic representation of apparatus according to the present invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, and be not used in qualification the present invention.
The invention provides a kind of method for charging batteries that is used for portable handheld devices such as mobile phone, the problem of temperature rise when being used to solve large current charge, and the problem of temperature rise of charging under the hot environment.Make battery can all keep constant current charge for a long time at a lower temperature.
Because battery is that electric energy is changed into chemical energy and a part of heat energy when charging, this part heat energy can cause the battery heating, and along with the increase of battery electric quantity, the ratio regular meeting that electric energy is converted to heat energy increases, and it is big that the temperature rise rate of battery also can become.The present invention increases a thermistor to carry out temperature detection in general battery of mobile phone constant current charge process, according to different temperature variations several charging current grades are set, and the grade of electric current is decided by the duty ratio of the PWM waveform of control chip output.The charging current grade can increase along with the speed (Δ T) that temperature rises and reduce, and is used for reducing the speed that temperature rises, and makes temperature remain on the scope of a safety, and battery can keep safe always, stably charging.
With reference to Fig. 2, providing a kind of is the method for the battery charge of portable handheld device, and it comprises:
Step S102 for the battery that is in the normal voltage scope, has electric weight now, charges with a plurality of charging current grades according to variations in temperature, battery; And
Step S104, when charging voltage is carried out constant voltage charge during greater than first voltage threshold, and when charging current complete charge during less than first current threshold.
The charging current grade can comprise quick constant current charge, normal current charging and half current charges.
The duty of pulse-width modulation waveform that can be by adjusting portable handheld device is recently adjusted the charging current grade.
Before step S102, can also comprise: compare cell voltage and minimal protection voltage,, then carry out precharge if cell voltage is lower than the normal voltage scope.
Step S102 can comprise: detect the electric weight of battery, if electric weight less than 50%, is then carried out quick constant current charge, and the variations in temperature of detection battery, if variations in temperature, is then carried out the normal current charging greater than first temperature threshold; If electric weight, is then carried out the normal current charging greater than 50%, and detect the variations in temperature of battery, if variations in temperature greater than second temperature threshold, is then carried out half current charges.
Fast the twice that constant current charge can normal current is to battery charge.
Half current charges can normal current half to battery charge.
Step S104 comprises: if detected battery temperature greater than the 3rd temperature threshold stop the charging.
Per 2 seconds once sampling of battery temperature, and battery temperature is stored in the array.
Battery temperature can obtain by thermistor.
With reference to Fig. 3; after having increased temperature protection of the present invention; when charging the battery; when battery electric quantity is lower at the beginning; because this time, electric energy all can convert chemical energy to basically; the part that is converted to heat energy is considerably less; so can use bigger electric current 2c (2 times to the current value of battery capacity) constant current charge fast; when the speed (Δ T) of temperature rising arrives certain value; electric current is dropped to 1c (1 times to the current value of battery capacity) constant current charge; the speed of temperature rising at this moment will be slack-off; increase along with battery electric quantity; the ratio that electric energy is converted to heat energy also will increase, and the speed (Δ T) that temperature rises also will increase, fall primary current to 0.5c (battery capacity value 1/2) when temperature rate-of-rise arrival predetermined value; at this moment battery electric quantity also has about 80%; when voltage is raised to 4.2V, transfer constant voltage charge to, the back just step 3 with general charging is identical.
Below with embodiment of the present invention will be described in more detail.
For fear of the overvoltage of battery and overheated, voltage and temperature protection are all arranged on Charge Management, general temperature protection is to set a temperature maximum, when temperature arrives this maximum, stops charging.The present invention has added the temperature protecting method of an intelligence on the basis of temperature in this maximum.
The charging current grade rely on portable sets such as mobile phone control chip output the PWM waveform and be connected on charging voltage and battery between switching tube decide, as shown in Figure 4.Recently adjust the grade of electric current with the reference voltage at Rsense two ends by the duty of adjusting PWM.
2. the collection of temperature is to obtain by being installed near the thermistor of battery.The temperature data that the variation of temperature rate is collected by control chip is added up and is obtained, the value of per 2 seconds once sampling temperature of MCU, and deposit the array R[30 of one 30 length in] in, push away before the data of every collection one secondary data with array, R[0]＜-R[1], R[1]＜-R[2] ..., R[28]＜-R[29], there is R[29 in new data of gathering] in.Calculate per minute variation of temperature amount R[29 then]-R[0], remove the time that has just begun one minute like this, the later per 2 seconds temperature variation Δ T that just can sample out.
3. charging process:
3.1 if cell voltage less than minimal protection voltage, uses little pre-charge, with the normal voltage range of being charged to of cell voltage safety.
3.2 if battery begins just to be in the normal voltage scope, detect its electric weight, if electric weight is greater than 50%, skip to step 3.3, if adopt 2 times of electric currents (being generally 2C) constant current charge fast to normal current less than 50%, then jump to step 3.3 if detect Δ T greater than predetermined value therebetween, it's not true skips to step 3.5.
3.3 in this step the inside, the electric weight of battery is more than 50%, battery is with normal current charging (being generally 1C), for temperature sensitive environment and the not so good battery of temperature characterisitic, may detect Δ T greater than predetermined value, detect and then jump to step 3.4, it's not true skips to step 3.5.
3.4 in this step the inside, the electric weight of battery is about 80%, the electric energy that charges this time has had and has much changed into heat energy, so will charge with normal current half (being generally 1/2C).
3.5 detect the voltage and current of battery, if temperature is greater than predetermined maximum temperature values, then stop charging, if voltage then transfers constant voltage charge to, along with the increase of battery electric quantity greater than predetermined maximum voltage value, electric current can descend gradually, drop to the predetermined current cutoff, it is full to illustrate that then battery has filled, and stops charging.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. one kind is the method for the battery charge of portable handheld device, it is characterized in that, comprising:
Step S102 for the battery that is in the normal voltage scope, has electric weight now, charges with a plurality of charging current grades according to variations in temperature, battery; And
Step S104, when charging voltage is carried out constant voltage charge during greater than first voltage threshold, and when charging current complete charge during less than first current threshold.
2. according to claim 1 is the method for the battery charge of portable handheld device, it is characterized in that, described charging current grade comprises quick constant current charge, normal current charging and half current charges.
3. according to claim 2 is the method for the battery charge of portable handheld device, it is characterized in that, the duty of the pulse-width modulation waveform by adjusting described portable handheld device is recently adjusted described charging current grade.
4. according to claim 3 is the method for the battery charge of portable handheld device, it is characterized in that, also comprises before described step S102:
More described cell voltage and minimal protection voltage if described cell voltage is lower than described normal voltage scope, are then carried out precharge.
5. according to claim 4 is the method for the battery charge of portable handheld device, it is characterized in that, described step S102 comprises:
Detect the electric weight of described battery,, and detect the described variations in temperature of described battery, if described variations in temperature, is then carried out described normal current charging greater than first temperature threshold if described electric weight less than 50%, is then carried out quick constant current charge;
If described electric weight, is then carried out the normal current charging greater than 50%, and detect the described variations in temperature of described battery, if described variations in temperature greater than second temperature threshold, is then carried out half current charges.
6. according to claim 5 is the method for the battery charge of portable handheld device, it is characterized in that, described quick constant current charge with the twice of normal current to described battery charge.
7. according to claim 5 is the method for the battery charge of portable handheld device, it is characterized in that, described half current charges with half of described normal current to described battery charge.
8. according to claim 4 is the method for the battery charge of portable handheld device, it is characterized in that, described step S104 comprises:
If detected battery temperature greater than the 3rd temperature threshold stop the charging.
9. described according in the aforementioned claim each is the method for the battery charge of portable handheld device, it is characterized in that, and per 2 seconds once sampling of described battery temperature, and described battery temperature is stored in the array.
10. according to claim 8 is the method for the battery charge of portable handheld device, it is characterized in that, described battery temperature obtains by thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN200710130027A CN100578889C (en) | 2007-07-25 | 2007-07-25 | Method for charging battery of portable handheld device |
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| CN200710130027A CN100578889C (en) | 2007-07-25 | 2007-07-25 | Method for charging battery of portable handheld device |
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| CN100578889C CN100578889C (en) | 2010-01-06 |
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| CN102914744A (en) * | 2012-06-29 | 2013-02-06 | 惠州Tcl移动通信有限公司 | Mobile terminal, battery power display system of mobile terminal, and method for acquiring battery power |
| CN102944846A (en) * | 2012-11-05 | 2013-02-27 | Tcl通讯（宁波）有限公司 | Method and system for detecting electricity quantity of battery in constant voltage charging process of mobile terminal |
| US8395357B2 (en) | 2009-06-26 | 2013-03-12 | AUSUSTeK Computer Inc. | Charging system and method for managing electric quantity of battery |
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