CN101630762B - Method and device for charging battery - Google Patents
Method and device for charging battery Download PDFInfo
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- CN101630762B CN101630762B CN2008101379429A CN200810137942A CN101630762B CN 101630762 B CN101630762 B CN 101630762B CN 2008101379429 A CN2008101379429 A CN 2008101379429A CN 200810137942 A CN200810137942 A CN 200810137942A CN 101630762 B CN101630762 B CN 101630762B
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- 238000007600 charging Methods 0.000 title claims abstract description 125
- 238000000034 method Methods 0.000 title claims abstract description 29
- 230000008859 change Effects 0.000 claims description 6
- 230000007423 decrease Effects 0.000 claims description 5
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- 230000009467 reduction Effects 0.000 abstract description 2
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- 230000008569 process Effects 0.000 description 5
- 230000033228 biological regulation Effects 0.000 description 3
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- 230000001105 regulatory effect Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a method and a device for charging a battery. The method comprises the following steps: when a battery module is charged with constant current or constant voltage, detecting the temperature of each buttery cell in the battery module; when the temperature of any one of the battery cells is over a threshold, reducing the charging current, wherein the threshold is not higher than the critical temperature requiring charging voltage reduction prescriptive in a safety specification; and after a period of time, judging whether the temperature of the buttery has a downtrend, if the temperature of the battery has a downtrend, maintaining the charging current, and if the temperature of the battery has no downtrend, reducing the charging current continuously. According to the steps, the battery can be charged under the condition of taking account of security consideration and no loss of battery capacity.
Description
Technical field
The present invention relates to a kind of method for charging batteries and device thereof, particularly a kind of temperature according to battery is adjusted the method for charging batteries and the device thereof of charging current.
Background technology
Along with development of science and technology, battery has become the indispensable power source of portable electron device, for example MP3 walkman, mobile phone and notebook computer etc., all using battery is main power source, for this reason, propose multiple charging method (method) successively, as decide trickle charge (Constant Trickle CurrentCharge), constant-current charge (Constant Current Charge), constant-current constant-voltage charging (ConstantCurrent Constant Voltage Charge) and the charging of two stages etc.
Yet, when battery module being charged with aforesaid various known charge methods, be full of electricity and shorten the charging interval in order to ensure battery, tend to battery module is applied charging voltage above rated voltage, the easy like this temperature of battery module that causes is too high, makes that battery is impaired even can have influence on user's safety.Be to solve foregoing problems, thus various safety standards have been proposed, as represented among Fig. 1 be the related specifications of present Japanese government charging current, voltage and the temperature formulated in 2007.Under the requirement of this regulation and stipulation, after the temperature of charging cell module is higher than 45 ℃ of the first standard temperature thresholds, suppose when charging current is 0.7C, the voltage of rechargeable battery must be from the first standard voltage threshold 4.2V, pressure is reduced to the second standard voltage threshold 4.1V with charging voltage, just charging voltage can be increased to again the first standard voltage threshold 4.2V after battery temperature is lower than the described first standard temperature threshold.Under such standard, can cause battery can't reach the battery capacity that specified charging voltage is 4.2V because the temperature of battery is higher than the described first standard temperature threshold when stopping to charge, and the battery charge time also be extended, cause user's inconvenience.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of method for charging batteries and device thereof of taking into account security consideration and not loss battery capacity.
To achieve these goals, the invention provides a kind of method for charging batteries, described method comprises following steps: provide charging current and charging voltage that described rechargeable battery is charged, whether the battery temperature of judging described rechargeable battery is higher than first threshold, when described battery temperature is higher than described first threshold, then reduce described charging current, next, detect the variation of described battery temperature in a period of time, the decline that is changed to as if described battery temperature, then keep described charging current,, then continue to reduce described charging current if being changed to of described battery temperature risen or kept.
Charging method provided by the invention, also can be included in before whether the battery temperature of judging described rechargeable battery be higher than first threshold, whether the voltage of judging described rechargeable battery is higher than second threshold value, when described voltage is lower than described second threshold value, then keeps described charging current; When described voltage is greater than or equal to described second threshold value, judge further then whether temperature is higher than first threshold, when described battery temperature is higher than described first threshold, then reduce described charging current, next, detect the variation of described battery temperature in a period of time, the decline that is changed to as if described battery temperature, then keep described charging current,, then continue to reduce described charging current if being changed to of described battery temperature risen or kept.
Further, when judged result will reduce charging current, can be according to the size of described temperature change trend, the value that decides described charging current to descend.
Description of drawings
Fig. 1 is the schematic diagram of relation of charging voltage, electric current and the temperature of mandatory rule;
Fig. 2 is the block diagram of embodiment of the battery charger of embodiments of the invention;
Fig. 3 is the battery temperature of embodiments of the invention and the schematic diagram of charging current and time relation;
Fig. 4 is the flow chart of steps of the method for charging batteries of embodiments of the invention.
Primary clustering symbol description: 20: charging device; 21: charging module; 22: control module; 23: adjustment module; 24: built-in internal memory; 241: first threshold; 242: the second threshold values; 243: the first Preset Times; 244: the second Preset Times; 25: temperature detecting module; 26: voltage detection module; 27: battery module; 271: battery; 40～44,401: steps flow chart.
Embodiment
Below with reference to accompanying drawings, method for charging batteries and device thereof according to the preferred embodiment of the invention are described, for the ease of understanding, in the following embodiments, identical assembly is denoted by the same reference numerals.
With reference to Fig. 2, Fig. 2 shows the block diagram of embodiment of the battery charger of embodiments of the invention.Among the figure, battery charger 20 can be used for having the rechargeable battery of intelligent chip.Described battery comprises the battery module 27 with a plurality of battery 271, and wherein, intelligent chip comprises temperature detecting module 25 and voltage detection module 26, is respectively applied for the temperature and the voltage that detect battery.And described charging device 20 comprises charging module 21 and control module 22, and charging module 21 is used for battery 271 input charging currents charging, and control module 22 is adjusted the charging current of described charging module 21 according to the program in the control module of being pre-stored in; Control module 22 comprises that also adjustment module 23 is to regulate the electric weight of charging current, adjustment module 23 can be one of variable resistor or current modulating device, but be not limited to this, adjustment module 23 can also realize in the mode of software, wherein, control module 22 also comprises built-in internal memory 24, and built-in internal memory 24 is used for storing first threshold 241, second threshold value 242, first Preset Time 243 and second Preset Time 244.
In this embodiment, temperature detecting module 25 detects the temperature of battery 271 in charging process, when the temperature that detects any one battery 271 surpasses first threshold 241 (for example 40 ℃), 22 of control modules to the charging current of battery (for example reduce by regulating and controlling module 23, reduce by 20%), behind first Preset Time 243 (for example 5 seconds), judge again whether the temperature of battery 271 has a declining tendency, if have, then keep described charging current; If no, then continue to reduce charging current to battery by adjustment module 23.Then, behind charging second Preset Time 244, judge whether that once more the temperature of any one battery 271 surpasses first threshold 241,, then keep charging current if do not have; If have, then continue the charging current that reduces battery by adjustment module 23.Control charging current by charging device 20, can allow the battery temperature maintenance below the first standard temperature threshold, and then the higher charging first standard voltage threshold (4.2V shown in the 1st figure) in the maintenance standard, the so not only fail safe of compliant also can be kept the charging capacity of battery.Especially described first threshold 241 is a little less than this standard temperature threshold, and battery 271 temperature continue to swing up and down at the standard temperature threshold in the charging process to avoid, and causes the necessary changing situation of charging voltage.
With reference to Fig. 3, Fig. 3 is the battery temperature of the embodiment of the invention and the schematic diagram of charging current and time relation, this schematic diagram is corresponding among first embodiment, temperature curve when battery 271 shown in Figure 2 is recharged and the decline curve of charging current, when temperature reaches first threshold (as 40 ℃), the charging current fixed value that then descends, and judge whether temperature has the trend of reduction, if no, then continue to reduce charging current, for example, at time point t1, charging current drops to C2 by C1, and when time point t2, the battery temperature does not have downward trend, therefore charging current drops to C3 by C2 once more, and when time point t3, the battery temperature does not have downward trend, so charging current drops to C4 by C3 once more.And after time point t3,,, therefore charging current is maintained C4 so the battery temperature presents downward trend because charging current has descended a lot.
In another embodiment, control module 23 further judges whether the battery temperature presents downward trend, and the speed of counting cell variations in temperature and determine the change amount of described charging current according to described speed.When rate temperature change was big, the magnitude of current that charging current changed was little; Otherwise when rate temperature change hour, the magnitude of current that charging current reduced is big, can further reduce the time difference that descends and caused because of electric current like this.
In another embodiment, also comprise voltage detection module 26, be used to detect the terminal voltage of battery 271.When the voltage that detects rechargeable battery when voltage detection module 26 is higher than second threshold value 242 (for example 4.1V), control module 22 is confirmed the temperature that temperature detecting module 25 transmits simultaneously, if described temperature reaches described first threshold, then regulating and controlling module 23 reduces charging current; If temperature does not reach described first threshold, then keep described charging current, and behind second Preset Time 244, judge once more whether temperature reaches first threshold.So also can meet aforesaid safety standard, and can further reduce the charging interval, because when cell voltage during not near the described first standard voltage threshold 4.2V, the expression battery does not also have near filling full state, and described situation is not subjected to the constraint of standard yet, so can continue to charge with higher charging current regardless of the too high misgivings of temperature, and then can be in safety and do not reduce under the prerequisite of battery capacity, can significantly not influence the charging interval.
With reference to Fig. 4, Fig. 4 is the flow chart of the embodiment of method for charging batteries of the present invention.In Fig. 4, described method for charging batteries is corresponding to battery charger shown in Figure 2.After charging module 21 begins to provide charging current and charging voltage to come described rechargeable battery charged, control module 22 in the charging device 20 begins the voltage with detected battery 271, the data that built-in internal memory 24 stores in parameters such as electric current and temperature and the control module 22 compare, in charging process, surpass the first standard temperature threshold (for example 45 ℃) in the standard for fear of described battery temperature, then need to reduce charging voltage (for example being reduced to 4.1V) according to described regulation, the situation that causes battery capacity to be full of fully, therefore, carry out as shown in Figure 4 flow process.In step 40, provide certain electric current to battery charge.Then, in step 41, judge whether the battery temperature of described rechargeable battery is higher than presetting first threshold (for example 40 ℃), when the temperature of rechargeable battery is higher than described first threshold, then carry out step 42.Wherein, first threshold is a little less than 45 ℃ of the first standard temperature threshold, and avoiding in charging process, battery temperature continues to raise and causes the variation of charging voltage.
In step 42, reduce the charging current of described battery, and carry out step 43 at the fixed time.The magnitude of current after wherein reducing can be in the step 41, and the primary current amount deducts fixed value; Also can be in the step 41, the percentage of former charging current, for example: when former charging current is 3.42A, reduce charging current to 70% of former charging current.
Then in step 43, judge whether battery temperature is on a declining curve, if then carry out step 44; If not, then get back to step 42.Wherein, the method of judging the trend that described battery temperature changes can be: more described battery temperature in first scheduled time first temperature difference and with continuous second scheduled time first scheduled time in second temperature difference, if described second temperature difference, is then judged the trend that described battery temperature changes less than described first temperature difference and is decline.
In addition, in step 44, keep described charging current, and behind charging second Preset Time execution in step 41, judge the temperature of battery once more.Wherein, behind second Preset Time, the reason that rejudges is that over time, the energy that the battery major part is filled has into changed into storable electric energy, therefore keeps the rising that described charging current can cause battery temperature once more.
Wherein, in step 42, the amplitude that electric current reduces can be adjusted according to the speed that temperature descends, and when the temperature fall off rate was big, the magnitude of current that charging current reduced was little; Otherwise when temperature fall off rate hour, the electric current that charging current reduced is big, can further reduce the required time of charging like this.
In addition, in this embodiment step 44, before getting back to step 41, can judge again as required whether described battery temperature is lower than the 3rd threshold value, if then improve described charging current; If not, then directly get back to step 41.Can further reduce the time of charging like this.Wherein, the 3rd threshold value is the temperature value that is lower than first threshold, and when for example first threshold was set at 40 ℃, the 3rd threshold value can be set at 35 ℃.
In another preferred embodiment, in order further to reduce the charging interval, before step 41, increase step 401, judge the terminal voltage of battery 271, when described cell voltage is higher than second threshold value (for example 4.1V), just carry out step 41, when not satisfying, then do not carry out any action as if described condition; Wherein, second threshold value is a little less than the 4.2V of the first standard voltage threshold.Since present charging regulation and stipulation under the specific charging voltage battery temperature can not surpass specified temp, even therefore battery temperature exceeds 40 ℃, if charging voltage surpasses the specific charging voltage of standard defined, then can think not have misgivings on safe on the battery.
Aforesaid all embodiment can be in judgement stops condition to battery charge, increase the restrictive condition that temperature need be lower than this standard threshold value, further guarantee can not occur in when stopping to charge, battery causes the situation of underfill because of the factor of temperature, make the capacity loss of battery.
The above only is exemplary, rather than restrictive.Anyly do not break away from spirit of the present invention and scope, and, all should be included in the scope of claims equivalent modifications or change that the present invention carries out.
Claims (10)
1. method for charging batteries is characterized in that said method comprising the steps of:
(a) provide charging current that rechargeable battery is charged;
(b) whether the battery temperature of judging described rechargeable battery is higher than first threshold, when described battery temperature is higher than described first threshold, then carries out step (c);
(c) reduce described charging current;
(d) reduce after the described charging current, detect the variation of described battery temperature,, then keep described charging current and execution in step (b) as if the decline that is changed to of described battery temperature, otherwise execution in step (c).
2. method for charging batteries as claimed in claim 1 is characterized in that also comprising the following steps: before in step (b)
Whether the voltage of judging described rechargeable battery is higher than second threshold value, if, execution in step (b) then.
3. method for charging batteries as claimed in claim 1 is characterized in that (b) is preceding in execution in step, also comprises the following steps: in step (d)
Judge whether described battery temperature is lower than the 3rd threshold value, if then improve described charging current.
4. method for charging batteries as claimed in claim 3 is characterized in that described the 3rd threshold value is lower than the temperature value of described first threshold.
5. method for charging batteries as claimed in claim 1 is characterized in that step (c) also comprises:
Calculate the speed that described battery temperature changes, and reduce described charging current according to described speed.
6. a battery charger is applicable to the rechargeable battery with a plurality of battery, it is characterized in that described battery charger comprises:
Charging module is used for described rechargeable battery input charging current to charge;
Temperature detecting module is used to detect the battery temperature of described rechargeable battery;
Adjustment module, to regulate described charging current: and
Control module, be used to judge whether the described battery temperature of described rechargeable battery is higher than first threshold, when described battery temperature is higher than described first threshold, then control described adjustment module and reduce described charging current, and detect the variation of described battery temperature, if being changed to of described battery temperature risen or kept, then control described adjustment module once more and reduce described charging current.
7. battery charger as claimed in claim 6 is characterized in that also comprising:
Voltage detection module is used to detect the cell voltage of described rechargeable battery;
Wherein, described control module comprises also whether the described cell voltage of judging described rechargeable battery is higher than second threshold value, when described cell voltage is lower than described second threshold value, then keep described charging current, when described cell voltage is greater than or equal to described second threshold value, then judge the described battery temperature of described rechargeable battery.
8. battery charger as claimed in claim 6 is characterized in that described control module judges also whether described battery temperature is lower than the 3rd threshold value, if then improve described charging current.
9. battery charger as claimed in claim 8 is characterized in that described the 3rd threshold value is lower than the temperature value of described first threshold.
10. battery charger as claimed in claim 6 is characterized in that described control module also calculates speed that described battery temperature changes and the change amount that determines described charging current according to described speed.
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| CN2008101379429A CN101630762B (en) | 2008-07-14 | 2008-07-14 | Method and device for charging battery |
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| CN2008101379429A CN101630762B (en) | 2008-07-14 | 2008-07-14 | Method and device for charging battery |
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| CN101630762A CN101630762A (en) | 2010-01-20 |
| CN101630762B true CN101630762B (en) | 2011-12-07 |
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| CN101630762A (en) | 2010-01-20 |
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