CN107834630B - Charging method and charging device - Google Patents
Charging method and charging device Download PDFInfo
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- CN107834630B CN107834630B CN201711090105.0A CN201711090105A CN107834630B CN 107834630 B CN107834630 B CN 107834630B CN 201711090105 A CN201711090105 A CN 201711090105A CN 107834630 B CN107834630 B CN 107834630B
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Classifications
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- H02J7/0077—
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
- H01M10/443—Methods for charging or discharging in response to temperature
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- H02J7/0091—
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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
Abstract
The invention provides a charging method and a charging device, wherein the method comprises the following steps: in the embodiment of the invention, the temperature and the voltage of the target rechargeable battery are detected; determining a target temperature range in which the temperature is located; when the voltage of the target rechargeable battery is smaller than a preset first cut-off voltage, continuously changing pulsating current is adopted to charge the target rechargeable battery; in the same time, the charging amount of the target rechargeable battery by adopting the pulsating current is greater than or equal to the charging amount of the target rechargeable battery by adopting a target constant-current charging current value matched with the target temperature range; and the valley current of the pulse current is smaller than the target constant current charging current value. The invention can effectively shorten the charging time of the target rechargeable battery and simultaneously can effectively reduce the probability of safety problems caused by the anode potential of the target rechargeable battery dropping to the lithium analysis potential due to polarization.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a charging method and a charging device.
Background
With the development of communication technology, the functions of the mobile terminal are more and more abundant, and the operation load of the mobile terminal is increased, so that the standby time of the mobile terminal is shorter and shorter. Therefore, batteries are increasingly gaining importance in the field of application of mobile terminals as a carrier for supplying energy to the mobile terminals.
The current charging mode mainly comprises two stages of constant current charging and constant voltage charging, specifically, when the voltage of a battery is smaller than a threshold voltage, the battery is charged by adopting the constant current charging mode, and when the voltage of the battery reaches the threshold voltage, the battery is charged by adopting the constant voltage charging mode. During the constant-current charging process, the battery generates an impedance accumulation polarization phenomenon, during the constant-voltage charging process, the impedance accumulation polarization phenomenon needs to be eliminated, and after the impedance accumulation polarization phenomenon is completely eliminated, the charging process of the battery is completed. In the prior art, after the constant-current charging is carried out for a long time, the impedance cumulative polarization phenomenon generated in the constant-current charging process is eliminated through the constant-voltage charging process, so that the elimination time of the impedance cumulative polarization phenomenon is long, and the charging time is long.
Disclosure of Invention
The embodiment of the invention provides a charging method and a charging device, which aim to solve the problem that the cruising ability of a target rechargeable battery is reduced due to the fact that the charging time of the target rechargeable battery is shortened in the conventional charging mode.
In a first aspect, an embodiment of the present invention provides a charging method, where the method includes:
detecting the temperature and voltage of the target rechargeable battery;
determining a target temperature range in which the temperature is located;
when the voltage of the target rechargeable battery is smaller than a preset first cut-off voltage, continuously changing pulsating current is adopted to charge the target rechargeable battery;
in the same time, the charging amount of the target rechargeable battery by adopting the pulsating current is greater than or equal to the charging amount of the target rechargeable battery by adopting a target constant-current charging current value matched with the target temperature range; and the valley current of the pulse current is smaller than the target constant current charging current value.
In a second aspect, an embodiment of the present invention further provides a charging device, including:
the detection module is used for detecting the temperature and the voltage of the target rechargeable battery;
the determining module is used for determining a target temperature range in which the temperature is located;
the first charging module is used for charging the target rechargeable battery by adopting continuously-changed pulsating current when the voltage of the target rechargeable battery is smaller than a preset first cut-off voltage;
in the same time, the charging amount of the target rechargeable battery by adopting the pulsating current is greater than or equal to the charging amount of the target rechargeable battery by adopting a target constant-current charging current value matched with the target temperature range; and the valley current of the pulse current is smaller than the target constant current charging current value.
In a third aspect, an embodiment of the present invention further provides a charging apparatus, which includes a processor, a memory, and a computer program stored on the memory and executable on the processor, and when executed by the processor, the computer program implements the steps of the charging method described above.
In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored, and when being executed by a processor, the computer program implements the steps of the charging method described above.
In the embodiment of the invention, the temperature and the voltage of the target rechargeable battery are detected; determining a target temperature range in which the temperature is located; when the voltage of the target rechargeable battery is smaller than a preset first cut-off voltage, continuously changing pulsating current is adopted to charge the target rechargeable battery; in the same time, the charging amount of the target rechargeable battery by adopting the pulsating current is greater than or equal to the charging amount of the target rechargeable battery by adopting a target constant-current charging current value matched with the target temperature range; and the valley current of the pulse current is smaller than the target constant current charging current value. Compared with the prior art that the target rechargeable battery is charged by adopting constant-current charging current, when the target rechargeable battery is charged by adopting continuously-changed pulsating current, the charging stage that the charging current in any period is reduced from the peak value to the valley value can relieve the phenomenon of impedance accumulation polarization caused by the charging stage that the charging current is increased from the valley value to the peak value, so that the constant-voltage charging time of the target rechargeable battery can be shortened, the overall charging time of the target rechargeable battery can be shortened, and the probability of safety problems caused by the fact that the anode potential of the target rechargeable battery is reduced to the lithium analysis potential due to polarization can be reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of a charging method according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a charging current provided by an embodiment of the present invention;
fig. 3 is a flowchart of a charging method according to another embodiment of the present invention;
FIG. 4 is a second schematic diagram of the charging current provided by the embodiment of the present invention;
fig. 5 is a structural diagram of a charging device according to an embodiment of the present invention;
fig. 6 is a structural diagram of a charging device according to still another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a flowchart of a charging method according to an embodiment of the present invention, and as shown in fig. 1, the charging method according to the embodiment includes the following steps:
In this embodiment, the charging device is preset with at least two charging modes, and the charging device can set at least one set of charging parameters corresponding to the same charging mode. The target rechargeable battery is a battery electrically connected with the charging device, and after the charging device is connected with the target rechargeable battery, the charging device selects a proper charging mode and charging parameters according to the detected state of the target rechargeable battery to charge the target rechargeable battery, so that the charging reliability of the target rechargeable battery is improved. Wherein, the charging parameters may include, but are not limited to, charging current and charging voltage; the state of the target rechargeable battery may include, but is not limited to, the temperature and voltage of the target rechargeable battery.
Specifically, the charging device may determine the charging manner of the target rechargeable battery according to a comparison result of the detected voltage of the target rechargeable battery and a preset first off voltage. In detail, when the target rechargeable battery of the voltage connected to the charging device is detected to be less than the preset first cut-off voltage, the target rechargeable battery may be charged in the first charging manner, and when the voltage connected to the charging device is detected to reach the first cut-off voltage, the target rechargeable battery may be charged in the second charging manner. The first charging mode in this embodiment is to charge the target rechargeable battery with a continuously changing pulsating current, that is, the intensity of the charging current of the target rechargeable battery changes periodically and continuously with time.
The charging device may determine the charging parameter in the charging mode according to a temperature range in which the detected temperature of the target rechargeable battery is located.
Therefore, after the charging device is connected to the target secondary battery, the temperature and voltage of the target secondary battery are detected.
And 102, determining a target temperature range where the temperature is located.
In this embodiment, for the first charging mode, the charging device may set at least two sets of charging parameters corresponding to different temperature ranges. Therefore, after the charging device detects the temperature of the target rechargeable battery, the temperature range in which the temperature is located can be determined as the target temperature range, so that the target rechargeable battery is charged by adopting the charging parameters corresponding to the target temperature range.
And 103, when the voltage of the target rechargeable battery is smaller than a preset first cut-off voltage, charging the target rechargeable battery by adopting continuously-changed pulsating current.
In the same time, the charging amount of the target rechargeable battery by adopting the pulsating current is greater than or equal to the charging amount of the target rechargeable battery by adopting a target constant-current charging current value matched with the target temperature range; and the valley current of the pulse current is smaller than the target constant current charging current value. The first cutoff voltage may be a full voltage threshold.
In this step, the charging current is a pulsating current, which indicates that the intensity of the charging current periodically changes with time, and the magnitude of the charging current value changes with the change of time in any period; since the pulsating current continuously changes, it indicates that the charging current value corresponding to the ending time point of the ith period is equal to the charging current value corresponding to the starting time point of the (i + 1) th period, wherein i is a natural number greater than 1; therefore, when the charging device charges the target secondary battery with a continuously varying ripple current, the charging current has a peak current (hereinafter, abbreviated as I)max) And valley current (hereinafter abbreviated as I)min) And in a certain way from IminRises to ImaxFrom then to ImaxDown to Imin。
In addition, in the present embodiment, the amount of charge of the target rechargeable battery charged by the pulsating current is equal to or greater than a target constant current charging current value (hereinafter referred to as I) corresponding to the target temperature rangeAllow for) A charge amount for charging the target rechargeable battery. Wherein, IAllow forThe charging chip is used for pre-configuring a target constant current charging current which is matched with a target temperature range and does not analyze lithium for a battery core matched with the target temperature range aiming at a new target rechargeable battery, namely when the charging device detects that the temperature of the target rechargeable battery is in the target temperature range, the charging device uses IAllow forWhen charging the target rechargeable battery, the electric core of the target rechargeable battery does not separate lithium, IAllow forIs in the range of [0.2C, 3C]I.e. ILet 1Greater than or equal to 0.2C and less than 3C, wherein C is the capacity of the target rechargeable battery. However, in practical situations, the time from the target rechargeable battery being configured in the mobile terminal to the first charging of the mobile terminal is long, and the aging of the target rechargeable battery during the time will cause the impedance of the target rechargeable battery to increase, and the I is directly usedAllow forThis leads to a series of problems in that the withstand current of the target secondary battery is exceeded. Therefore, in this embodiment, I of the pulse currentminIs less than IAllow forWhen the charging mode of the invention is adopted to charge the target rechargeable battery for the first time, the charging mode is just startedThe target rechargeable battery is gradually increased but is less than IAllow forThe current charging of (2) can make the target rechargeable battery which is placed for a long time fully activated to eliminate partial impedance, and reduce the risk of capacity loss caused by first charging.
In summary, when the charging device charges the target rechargeable battery with continuously varying pulsating current, the charging current is changed from I to I in any periodmin→IAllow for→Imax→IAllow for→Imin. In Imin→IAllow forStage by using a gradual increase but less than IAllow forThe target rechargeable battery can be fully activated by current charging; in IAllow for→ImaxStage, using a larger than IAllow forThe charging speed can be greatly improved by charging with gradually increased current; in Imax→IAllow forStage, using a larger than IAllow forBut the charging with gradually reduced current can also relieve I under the condition of increasing the charging speedAllow for→ImaxRapid accumulation of impedance due to increase in step current; in IAllow for→IminStage, using a less than IAllow forAnd the polarization phenomenon caused by a large-current charging process can be gradually reduced by gradually reducing the current charging, so that the safety problem caused by the fact that the anode potential of the target rechargeable battery is rapidly reduced to the lithium precipitation potential is avoided.
Optionally, the pulsating current is a triangular wave current. For ease of understanding, please refer to FIG. 2. In fig. 2, the abscissa is the charging time T and the ordinate is the charging current I; at time T1Detecting, by the charging device, that the voltage of the target secondary battery reaches a first cutoff voltage; at time T2At this point, the charging current reaches the cutoff current; i of pulsating currentminAnd ImaxHas a sum of IAllow forTwice as much. When T is less than T1The charging device charges the target rechargeable battery with a continuously varying pulsating current.
As shown in FIG. 2, during a minimum positive period, the charging current is from IminBegins to increase to I in a linearly increasing mannerAllow forTo ImaxFrom then to ImaxStarts to decrease to I in a linearly decreasing mannerAllow forTo Imin1And the steps are repeated in a circulating mode until the charging device detects that the voltage of the target charging battery reaches the first cut-off voltage. The following equation may be used, incremental segments: i ═ K1T+Imin(ii) a A decreasing section: i ═ Imax-K2And T. The slope absolute value of the triangular wave current linearly increasing and the slope absolute value of the linearly decreasing can be the same or different, namely K1And K2May or may not be equal; since the charging amount is proportional to the charging current in the same time, I of the pulsating current provided by the charging devicemax1And Imin1Can be formed byAllow forAnd (4) determining.
Of course, in other specific embodiments, the continuously varying first pulse current may be represented as a sine wave current, i.e. the charging current is from I to I within a minimum positive periodminBegin increasing to I in sinusoidal incrementsAllow forTo ImaxFrom then to ImaxStarts decreasing to I in a sinusoidal decreasing mannerAllow forTo Imin(ii) a Alternatively, the continuously varying first pulse current may be in a minimum positive period from IminBegin to increase to I in other waysAllow forTo ImaxFrom then to ImaxBegin to fall down to I in other waysAllow forTo IminThe embodiment of the present invention is not limited thereto.
In fig. 2, when T is greater than T1In the meantime, the charging device adopts a constant voltage charging mode, such as keeping the first cut-off voltage constant until the charging current reaches a preset cut-off current (I in the figure)Cutting block) The manner of charging the target rechargeable battery is only an example, and in other embodiment, when the charging device detects that the voltage of the target rechargeable battery reaches the first cut-off voltage, the charging device may charge the target rechargeable battery in other manners until the charging current reaches ICutting blockThe embodiment of the present invention is not limited thereto. In addition, IminAnd ImaxHas a sum of IAllow forTwice of, i.e. the same timeIn other embodiments, the charging amount of the target rechargeable battery by using the pulsating current is equal to the charging amount of the target rechargeable battery by using the target constant current charging current value matching the target temperature rangeminAnd ImaxThe sum of (A) and (B) may be greater than IAllow forTwice, this is not limited by the embodiments of the present invention.
Therefore, the invention adopts continuous pulsating current to charge the target rechargeable battery, and the charging current of any period is from ImaxDown to IminThe charging stage can effectively relieve the charging current from IminRises to ImaxCompared with the prior art, the method can effectively shorten the constant-voltage charging time, further shorten the overall charging time of the target rechargeable battery, and simultaneously can effectively reduce the probability of safety problems caused by the fact that the anode potential of the target rechargeable battery rapidly drops to the lithium analysis potential due to polarization.
In addition, since the charging amount of the target secondary battery, that is, the capacity of the target secondary battery is fixed, if the charging amount of the target secondary battery with continuous pulsating current is larger than the charging amount of the target secondary battery with the target constant current charging current value matching the target temperature range, the charging time for the target secondary battery voltage to reach the first threshold voltage can be shortened, and the overall charging time for the target secondary battery to be fully charged can be further shortened.
In the embodiment of the present invention, the charging device may be an adapter or a charger, and the like, which is not limited in the embodiment of the present invention; when the target rechargeable battery is configured in the mobile terminal for use, the mobile terminal may be a mobile phone, a Tablet Personal Computer (Tablet Personal Computer), a Laptop Computer (Laptop Computer), a Personal digital assistant (PDA for short), a Mobile Internet Device (MID), a Wearable Device (Wearable Device), or the like; the target rechargeable battery can be composed of an anode, a cathode, electrolyte, a diaphragm and an aluminum plastic film and is manufactured through a series of processes such as formation, aging and the like. The middle yinThe electrode can be made of 97% LiCoO2(cobalt lithium oxide), 1.6% PVDF (polyvinylidene fluoride) and 1.4% SP (Super P, ultra-fine carbon powder) are mixed, the anode can be formed by mixing 97.7% artificial graphite, 1.0% SBR (Styrene Butadiene Rubber) and 1.3% CMC (sodium carboxymethylcellulose), the diaphragm can be PE (Polyethylene) film, the electrolyte can be formed by organic solvent and additive and LiPF (lithium iron phosphate) according to a certain proportion6(lithium hexafluorophosphate), which is not limited by the examples of the present invention.
In the charging method of the present embodiment, the temperature and voltage of the target rechargeable battery are detected; determining a target temperature range in which the temperature is located; when the voltage of the target rechargeable battery is smaller than a preset first cut-off voltage, continuously changing pulsating current is adopted to charge the target rechargeable battery; in the same time, the charging amount of the target rechargeable battery by adopting the pulsating current is greater than or equal to the charging amount of the target rechargeable battery by adopting a target constant-current charging current value matched with the target temperature range; and the valley current of the pulse current is smaller than the target constant current charging current value. Compared with the prior art that the target rechargeable battery is charged by adopting constant-current charging current, when the target rechargeable battery is charged by adopting continuously-changed pulsating current, the charging stage that the charging current in any period is reduced from the peak value to the valley value can relieve the phenomenon of impedance accumulation polarization caused by the charging stage that the charging current is increased from the valley value to the peak value, so that the constant-voltage charging time of the target rechargeable battery can be shortened, the overall charging time of the target rechargeable battery can be shortened, and the probability of safety problems caused by the fact that the anode potential of the target rechargeable battery is reduced to the lithium analysis potential due to polarization can be reduced.
Referring to fig. 3, fig. 3 is a flowchart of a charging method according to another embodiment of the present invention, and the main difference between this embodiment and the above embodiment is that the step of charging the target rechargeable battery with continuously varying ripple current when the voltage of the target rechargeable battery is less than a preset first cut-off voltage is further defined, specifically: when the voltage of the target rechargeable battery is smaller than a preset second cut-off voltage, charging the target rechargeable battery by adopting the first pulsating current; and when the voltage of the target rechargeable battery is greater than or equal to the second cut-off voltage and less than a preset first cut-off voltage, charging the target rechargeable battery by adopting the second pulsating current.
As shown in fig. 3, the charging method of the present embodiment includes the following steps:
In this embodiment, step 301 is the same as step 101 in the above method embodiment, and step 302 is the same as step 102 in the above method embodiment, and reference may be specifically made to the description in the above embodiment, and in order to avoid repetition, details are not repeated here.
And step 303, when the voltage of the target rechargeable battery is smaller than a preset second cut-off voltage, charging the target rechargeable battery by using the first pulsating current.
And step 304, when the voltage of the target rechargeable battery is greater than or equal to the second cut-off voltage and less than a preset first cut-off voltage, charging the target rechargeable battery by using the second pulsating current.
In this embodiment, when it is detected that the voltage of the target rechargeable battery is smaller than the preset first cut-off voltage, the charging phase using the continuously-changing ripple current is divided into two phases, and correspondingly, the ripple current is further subdivided into the first ripple current and the second ripple current. Specifically, when the voltage of the television is detected to be smaller than a preset second cut-off voltage, the target rechargeable battery is charged by adopting the first pulsating current until the voltage of the target rechargeable battery reaches the preset second cut-off voltage, and then the target rechargeable battery is charged by adopting the second pulsating current until the voltage of the target rechargeable battery reaches the preset first cut-off voltage.
And in the same time, the charging amount of the target rechargeable battery by adopting the first pulsating current is larger than the charging amount of the target rechargeable battery by adopting the second pulsating current. Meanwhile, in consideration of the fact that the charging amount of the target rechargeable battery by the pulsating current is greater than or equal to the charging amount of the target rechargeable battery by the target constant-current charging current value matching the target temperature range within the same time, it can be understood that the charging amount of the target rechargeable battery by the first pulsating current is greater than the charging amount of the target rechargeable battery by the target constant-current charging current value matching the target temperature range within the same time; and the charging amount of the target rechargeable battery by adopting the second pulsating current is greater than or equal to the charging amount of the target rechargeable battery by adopting a target constant-current charging current value matched with the target temperature range.
Since the ripple current continuously changes, the valley current of the first ripple current is equal to the valley current of the second ripple current, and the peak current of the first ripple current is larger than the peak current of the second ripple current. Therefore, after the voltage of the target rechargeable battery reaches the second cut-off voltage, the target rechargeable battery is charged by the second pulsating current, and compared with the case that the target rechargeable battery is charged by the first pulsating current, the impedance accumulation polarization phenomenon caused by large-current charging can be reduced to a certain extent.
The first ripple current and the second ripple current are both triangular waves for explanation, please refer to fig. 4. In fig. 4, the abscissa represents the charging time T, and the ordinate represents the charging current I. To facilitate comparison of the prior art with the present invention, a first pulsating current, a second pulsating current, and a constant voltage charging curve of the present invention are plotted simultaneously at time T of the curve in FIG. 41The charging device detects that the voltage of the target rechargeable battery reaches a second cut-off voltage for a time T2Detecting, by the charging device, that the voltage of the target secondary battery reaches a first cutoff voltage; time T3At this point, the charging current reaches the cutoff current; and charging current curves at constant current and constant voltage charging stages of the prior artAt time T of the curve4Detecting, by the charging device, that the voltage of the target secondary battery reaches a first cutoff voltage; time T5At this point, the charging current reaches the cutoff current. I of the first pulsating currentmin1And Imax1Is greater than IAllow forTwice the second ripple current, Imin2And Imax2Has a sum of IAllow forIs twice as large as Imin1And Imin2Equal therefore, marked I in FIG. 4min。
In the first pulse current charging phase, i.e. T is less than T1Stage Imin1And Imax1Is greater than IAllow forTwice, the charging amount of the target rechargeable battery in the invention is larger than that of the target rechargeable battery in the prior art in the same time. Therefore, compared with the prior art, the charging time of the target rechargeable battery voltage reaching the second cut-off voltage can be shortened in the stage, and meanwhile, the phenomenon of impedance accumulation polarization caused by high-current charging in the stage can be relieved, so that the later constant-voltage charging time is shortened.
In a second pulsating current charging phase, i.e. T is greater than T1Is less than T2Stage Imin2And Imax2Has a sum of IAllow forTwice, the charging amount of the target rechargeable battery in the invention is equal to that of the target rechargeable battery in the prior art in the same time. Therefore, compared with the prior art, although the charging time of the target rechargeable battery voltage from the second cut-off voltage to the first cut-off voltage cannot be shortened in the stage, the impedance accumulation polarization phenomenon caused by large-current charging in the stage can be relieved, and the constant-voltage charging time in the later stage can be shortened. In another embodiment, if the charging amount of the target rechargeable battery by using the second ripple current is larger than the charging amount of the target rechargeable battery by using the target constant current charging current value matching the target temperature range, the time for the target rechargeable battery voltage to reach the first cut-off voltage may be further shortened at this stage, and the overall charging time of the target rechargeable battery may be further shortened.
To sum up, adopt the bookThe charging mode of the invention ensures that the time for the voltage of the target rechargeable battery to reach the first cut-off voltage is shorter than the time for the voltage of the target rechargeable battery to reach the first cut-off voltage by adopting the prior art, the time for constant voltage charging by adopting the charging mode of the invention is shorter than the time for constant voltage charging by adopting the charging mode of the prior art, and no lithium precipitation occurs in the interface of the disassembled target rechargeable battery after full charge. As shown in fig. 4, it takes time T to charge the target rechargeable battery by the charging method of the present invention2The voltage of the target rechargeable battery reaches the first cut-off voltage, and the charging method in the prior art is adopted to charge the target rechargeable battery, which needs to consume time T4Causing the target rechargeable battery voltage to reach a first cutoff voltage; t is consumed for charging the target rechargeable battery by adopting the charging mode of the invention3-T2The charging current reaches the cut-off current by the time, and the target rechargeable battery is charged by adopting the charging mode in the prior art, which needs T5-T4The time is such that the charging current reaches the cutoff current.
Optionally, the method further includes:
and when the voltage of the target rechargeable battery is greater than or equal to the first cut-off voltage, charging the target rechargeable battery in a constant voltage charging mode until the charging current reaches a preset cut-off current.
In this step, the target rechargeable battery may be charged with the first cut-off voltage kept constant until the charging current reaches the preset cut-off current, that is, the entire charging phase of the target rechargeable battery is completed. The constant voltage charging stage is mainly used for eliminating the phenomenon of impedance accumulated polarization caused by the pulsating current charging stage and recovering the activity of the target rechargeable battery. Wherein, the cut-off current is a charge cut-off current, the range of the cut-off current is [0.02C, 0.1C ], namely, the cut-off current is more than or equal to 0.02C and less than 0.1C, and C is the target rechargeable battery capacity.
It should be noted that this optional step is equally applicable to the above-described method embodiments.
Optionally, the target temperature range at least includes a first temperature range and a second temperature range;
and if the minimum value of the first temperature range is larger than the maximum value of the second temperature range, the valley current of the pulsating current corresponding to the first temperature range is larger than the constant current charging current matched with the second temperature range.
Specifically, if the minimum value of the first temperature range is greater than the maximum value of the second temperature range, the valley current of the ripple current corresponding to the first temperature range is greater than the constant current charging current matched with the second temperature range; the valley current of the pulsating current corresponding to the first temperature range is smaller than the constant current charging current matched with the first temperature range; a valley current of the ripple current corresponding to the second temperature range is larger than an off-current.
In this step, the target temperature ranges including three temperature ranges of 10 ℃ to 15 ℃, 15 ℃ to 20 ℃ and 20 ℃ to 45 ℃ are taken as examples for explanation, and it is assumed that the target rechargeable battery capacity C is 3000mAh, the second cut-off voltage is 4.2V, the first cut-off voltage is 4.4V, and the cut-off current is greater than or equal to 0.01C and less than 0.1C.
If the temperature is in the range of 10-15 ℃, the constant current charging current I isAllow for0.3C 900mA, preset I in the temperature range of 15-20 DEG CminGreater than or equal to 0.1C and less than 0.3C; constant current charging current I in the temperature range of 15-20 DEG CAllow for0.4C 1200mA, preset I in the temperature range of 15-20 DEG CminMore than 0.3C and less than 0.4C; constant current charging current I in the temperature range of 20-45 DEG CAllow for0.7C 2100mA, preset I at 20-45 deg.CminGreater than 0.4C and less than 0.7C.
Assuming a temperature in the range of 10 ℃ to 15 ℃, IAllow for＝0.3C；Imin1＝Imin2＝Imin＝0.2C；Imax1＝0.5C；Imax20.4C; in the temperature range of 15-20 ℃, IAllow for＝0.4C；Imin1＝Imin2＝Imin＝0.3C，Imax1＝0.6C，Imax20.5C; in the temperature range of 20-45 ℃, IAllow for＝0.7C；Imin1＝Imin2＝Imin＝0.5C，Imax1＝1C，Imax2＝0.9C。
According to coulomb's law integral calculation, the second ripple current charging phase makes the charging time of the target rechargeable battery voltage from the second cut-off voltage to the first cut-off voltage equal to the charging time of the prior art constant current charging phase making the target rechargeable battery voltage from the second cut-off voltage to the first cut-off voltage; however, as shown in table 1, in different temperature ranges, the charging amount per unit time in the first ripple current charging stage can be increased to a certain extent compared with the constant current charging stage in the prior art, and especially, the charging speed can be significantly increased at a lower temperature, so that the time for the target rechargeable battery voltage to reach the second cut-off voltage can be shortened, and the duration of the constant voltage charging stage can also be shortened.
Table 1: comparison relation table of first pulsating current charging stage and constant current charging stage
Referring to fig. 5, fig. 5 is a structural diagram of a charging device according to an embodiment of the present invention, and as shown in fig. 5, the charging device 500 includes: a detection module 501, a determination module 502, and a first charging module 503.
The detection module 501 is configured to detect a temperature and a voltage of a target rechargeable battery;
a determining module 502, configured to determine a target temperature range in which the temperature is located;
a first charging module 503, configured to charge the target rechargeable battery with a continuously varying ripple current when the voltage of the target rechargeable battery is less than a preset first cut-off voltage;
in the same time, the charging amount of the target rechargeable battery by adopting the pulsating current is greater than or equal to the charging amount of the target rechargeable battery by adopting a target constant-current charging current value matched with the target temperature range; and the valley current of the pulse current is smaller than the target constant current charging current value.
Optionally, the ripple current includes a first ripple current and a second ripple current;
a first charging module 503, comprising:
the first charging unit is used for charging the target rechargeable battery by adopting the first pulsating current when the voltage of the target rechargeable battery is smaller than a preset second cut-off voltage;
the second charging unit is used for charging the target rechargeable battery by adopting the second pulsating current when the voltage of the target rechargeable battery is greater than or equal to the second cut-off voltage and is less than a preset first cut-off voltage;
and in the same time, the charging amount of the target rechargeable battery by adopting the first pulsating current is larger than the charging amount of the target rechargeable battery by adopting the second pulsating current.
Optionally, the charging device 500 further includes:
and the second charging module is used for charging the target rechargeable battery in a constant voltage charging mode when the voltage of the target rechargeable battery is greater than or equal to the first cut-off voltage until the charging current reaches a preset cut-off current.
Optionally, the pulsating current is a triangular wave current.
Optionally, the target temperature range at least includes a first temperature range and a second temperature range;
and if the minimum value of the first temperature range is larger than the maximum value of the second temperature range, the valley current of the pulsating current corresponding to the first temperature range is larger than the constant current charging current matched with the second temperature range.
The charging device 500 can implement the processes implemented by the charging device in the method embodiments of fig. 1 and fig. 3 and the same beneficial effects, and in order to avoid repetition, the detailed description is omitted here.
Referring to fig. 6, the charging device 600 includes: a processor 601, a memory 602, a computer program stored on the memory 602 and executable on said processor 601, the computer program, when executed by the processor 601, being adapted to:
detecting the temperature and voltage of the target rechargeable battery;
determining a target temperature range in which the temperature is located;
when the voltage of the target rechargeable battery is smaller than a preset first cut-off voltage, continuously changing pulsating current is adopted to charge the target rechargeable battery;
in the same time, the charging amount of the target rechargeable battery by adopting the pulsating current is greater than or equal to the charging amount of the target rechargeable battery by adopting a target constant-current charging current value matched with the target temperature range; and the valley current of the pulse current is smaller than the target constant current charging current value.
Optionally, the ripple current includes a first ripple current and a second ripple current;
the computer program, when executed by the processor 601, is further operable to:
when the voltage of the target rechargeable battery is smaller than a preset second cut-off voltage, charging the target rechargeable battery by adopting the first pulsating current;
when the voltage of the target rechargeable battery is greater than or equal to the second cut-off voltage and smaller than a preset first cut-off voltage, charging the target rechargeable battery by adopting the second pulsating current;
and in the same time, the charging amount of the target rechargeable battery by adopting the first pulsating current is larger than the charging amount of the target rechargeable battery by adopting the second pulsating current.
Optionally, the computer program, when executed by the processor 601, is further configured to:
and when the voltage of the target rechargeable battery is greater than or equal to the first cut-off voltage, charging the target rechargeable battery in a constant voltage charging mode until the charging current reaches a preset cut-off current.
Optionally, the pulsating current is a triangular wave current.
Optionally, the target temperature range at least includes a first temperature range and a second temperature range;
and if the minimum value of the first temperature range is larger than the maximum value of the second temperature range, the valley current of the pulsating current corresponding to the first temperature range is larger than the constant current charging current matched with the second temperature range.
It should be noted that, in this embodiment, the charging device 600 may be a charging device in any implementation manner in the method embodiment in the embodiment of the present invention, that is, any implementation manner of the charging device in the method embodiment in the embodiment of the present invention may be implemented by the charging device 600 in this embodiment, and the same beneficial effects are achieved, and in order to avoid repetition, no further description is provided herein.
The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process of the charging method embodiment, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (10)
1. A charging method is applied to a charging device and is characterized by comprising the following steps:
detecting the temperature and voltage of the target rechargeable battery;
determining a target temperature range in which the temperature is located;
when the voltage of the target rechargeable battery is smaller than a preset first cut-off voltage, continuously changing pulsating current is adopted to charge the target rechargeable battery, and the first cut-off voltage is smaller than or equal to a full-charge voltage threshold value;
in the same time, the charging amount of the target rechargeable battery by adopting the pulsating current is greater than or equal to the charging amount of the target rechargeable battery by adopting a target constant-current charging current value matched with the target temperature range; the valley current of the pulsating current is smaller than the target constant current charging current value, and the peak current of the pulsating current is larger than the target constant current charging current value;
the ripple current comprises a first ripple current and a second ripple current;
when the voltage of the target rechargeable battery is smaller than a preset first cut-off voltage, the step of charging the target rechargeable battery by adopting continuously-changed pulsating current comprises the following steps:
when the voltage of the target rechargeable battery is smaller than a preset second cut-off voltage, charging the target rechargeable battery by adopting the first pulsating current;
when the voltage of the target rechargeable battery is greater than or equal to the second cut-off voltage and smaller than a preset first cut-off voltage, charging the target rechargeable battery by adopting the second pulsating current;
and in the same time, the charging amount of the target rechargeable battery by adopting the first pulsating current is larger than the charging amount of the target rechargeable battery by adopting the second pulsating current.
2. The charging method according to claim 1, further comprising:
and when the voltage of the target rechargeable battery is greater than or equal to the first cut-off voltage, charging the target rechargeable battery in a constant voltage charging mode until the charging current reaches a preset cut-off current.
3. The charging method according to claim 1, wherein the pulsating current is a triangular wave current.
4. The charging method according to claim 1, wherein the target temperature range includes at least a first temperature range and a second temperature range;
and if the minimum value of the first temperature range is larger than the maximum value of the second temperature range, the valley current of the pulsating current corresponding to the first temperature range is larger than the constant current charging current matched with the second temperature range.
5. A charging device, comprising:
the detection module is used for detecting the temperature and the voltage of the target rechargeable battery;
the determining module is used for determining a target temperature range in which the temperature is located;
the first charging module is used for charging the target rechargeable battery by adopting continuously-changed pulsating current when the voltage of the target rechargeable battery is smaller than a preset first cut-off voltage, wherein the first cut-off voltage is smaller than or equal to a full-charge voltage threshold value;
in the same time, the charging amount of the target rechargeable battery by adopting the pulsating current is greater than or equal to the charging amount of the target rechargeable battery by adopting a target constant-current charging current value matched with the target temperature range; the valley current of the pulsating current is smaller than the target constant current charging current value, and the peak current of the pulsating current is larger than the target constant current charging current value; the ripple current comprises a first ripple current and a second ripple current;
the first charging module includes:
the first charging unit is used for charging the target rechargeable battery by adopting the first pulsating current when the voltage of the target rechargeable battery is smaller than a preset second cut-off voltage;
the second charging unit is used for charging the target rechargeable battery by adopting the second pulsating current when the voltage of the target rechargeable battery is greater than or equal to the second cut-off voltage and is less than a preset first cut-off voltage;
and in the same time, the charging amount of the target rechargeable battery by adopting the first pulsating current is larger than the charging amount of the target rechargeable battery by adopting the second pulsating current.
6. The charging device according to claim 5, further comprising:
and the second charging module is used for charging the target rechargeable battery in a constant voltage charging mode when the voltage of the target rechargeable battery is greater than or equal to the first cut-off voltage until the charging current reaches a preset cut-off current.
7. A charging arrangement as claimed in claim 5, in which the pulsating current is a triangular wave current.
8. A charging arrangement as claimed in claim 5, in which the target temperature range comprises at least a first temperature range and a second temperature range;
and if the minimum value of the first temperature range is larger than the maximum value of the second temperature range, the valley current of the pulsating current corresponding to the first temperature range is larger than the constant current charging current matched with the second temperature range.
9. A charging apparatus, comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the charging method as claimed in any one of claims 1 to 4.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the charging method according to any one of claims 1 to 4.
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| CN111183561B (en) * | 2018-09-12 | 2024-02-23 | Oppo广东移动通信有限公司 | Charging control method and device, electronic equipment and computer readable storage medium |
| CN110729520B (en) * | 2019-09-05 | 2024-02-20 | 力神（青岛）新能源有限公司 | Ternary battery rapid charging method |
| CN112886650A (en) * | 2019-11-29 | 2021-06-01 | 北京小米移动软件有限公司 | Charging control method, charging control device and storage medium |
| US11498446B2 (en) * | 2020-01-06 | 2022-11-15 | Ford Global Technologies, Llc | Plug-in charge current management for battery model-based online learning |
| CN111654075A (en) * | 2020-05-18 | 2020-09-11 | 肇庆小鹏汽车有限公司 | Battery charging control method and device, battery management system and vehicle |
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