CN113571789A - Method and device for accelerating charging speed of lithium ion battery and storage medium - Google Patents
Method and device for accelerating charging speed of lithium ion battery and storage medium Download PDFInfo
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- CN113571789A CN113571789A CN202110852314.4A CN202110852314A CN113571789A CN 113571789 A CN113571789 A CN 113571789A CN 202110852314 A CN202110852314 A CN 202110852314A CN 113571789 A CN113571789 A CN 113571789A
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- 238000007600 charging Methods 0.000 title claims abstract description 130
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 102
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000009467 reduction Effects 0.000 claims abstract description 46
- 238000010277 constant-current charging Methods 0.000 claims abstract description 23
- 238000004590 computer program Methods 0.000 claims description 13
- 230000007423 decrease Effects 0.000 claims description 13
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000010280 constant potential charging Methods 0.000 abstract description 6
- 230000003247 decreasing effect Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 229910052744 lithium Inorganic materials 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
- H02J7/007186—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage obtained with the battery disconnected from the charge or discharge circuit
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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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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The method, the device and the storage medium for accelerating the charging speed of the lithium ion battery comprise the steps of carrying out constant current charging Icc on the lithium ion battery, judging whether the voltage of the lithium ion battery reaches the sum of a full charge threshold and a first compensation amount, and if the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, reducing the charging current for the first time, wherein the reduction amount is Icc/n, and the compensation amount is reduced to a second compensation amount in the same proportion; if the voltage of the lithium ion battery reaches the sum of the full charge threshold and the second compensation amount, the charging current is further reduced, the compensation amount is further reduced, whether the current reduction frequency is n or not and whether the compensation amount is zero or not are judged, if the current reduction frequency is n and the compensation amount is zero, the charging is finished, after the internal resistance compensation, the constant voltage charging time is obviously shortened, and the full charge degree is also improved. The circuit is simple and reliable to realize, the charging speed is obviously improved, and the full-charge voltage is optimized.
Description
Technical Field
The present disclosure relates to the field of lithium ion batteries, and more particularly, to a method, an apparatus, and a storage medium for increasing the charging speed of a lithium ion battery.
Background
With the popularization of lithium batteries, the demand for lithium battery charging management is more and more vigorous. The lithium battery charging needs to meet the three-stage charging specification of trickle, constant current and constant voltage, as shown in figure 1, namely, when the battery voltage is less than 2.9V, trickle charging with small current is carried out; after the voltage is higher than 2.9V, carrying out large-current constant-current rapid charging; when the voltage reaches or approaches 4.2V (different according to different battery materials), constant voltage charging is carried out, and the current is gradually reduced until the battery is fully charged. Therefore, the charging safety is ensured, and the service life of the battery is also prolonged.
The traditional charging management chip can enter a Constant Voltage (CV) charging stage when the battery is nearly fully charged, so that more electric quantity can be charged into the battery while the battery voltage is not overcharged. In the constant voltage charging process, the charging current gradually decreases, and when the current decreases to a certain value, which is usually 1/10 of Constant Current (CC) charging current, the chip detects the current value and enters a full charge state. The charging management mode has the advantages of large circuit overhead, and low charging precision and efficiency.
Disclosure of Invention
In view of the above, it is necessary to provide a method, an apparatus and a storage medium for accelerating the charging speed of a lithium ion battery.
The embodiment of the application provides a method for accelerating the charging speed of a lithium ion battery, which comprises the following steps:
s10, carrying out constant current charging Icc on the lithium ion battery;
s20, judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount;
s30, if the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, the charging current is reduced for the first time, the reduction amount is Icc/n, and the compensation amount is reduced to a second compensation amount in the same proportion; wherein n is a positive integer;
s40, if the voltage of the lithium ion battery reaches the sum of the full threshold and the second compensation amount, further reducing the charging current, further reducing the compensation amount, and judging whether the current reduction frequency is n and whether the compensation amount is zero;
s50, if the current reduction times is n and the compensation amount is reduced to zero, ending the charging;
and S20, judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, if the voltage of the lithium ion battery does not reach the sum of the first threshold and the first compensation amount, continuing to execute S10, and carrying out constant current charging Icc on the lithium ion battery.
In one embodiment, if the voltage of the lithium ion battery does not reach the sum of the full charge threshold and the second compensation amount, the charging is continued.
In one embodiment, in the method S50 for increasing the charging speed of the lithium ion battery, if the current reduction number does not reach n and the compensation amount does not decrease to zero, the process continues to step S40.
In one embodiment, the compensation threshold is k × IBATESR, where K is a real number from 0 to 1, IBATThe ESR is the current of the lithium ion battery and the internal resistance of the charging circuit and the battery.
In one embodiment, the method for accelerating the charging speed of the lithium ion battery includes the following steps:
wherein the trickle charge threshold voltage is VTRFull of target voltage VFVREF; at VTRTo VFDuring the period, the constant current is always ICCCharging; the current for terminating the charging is ICCN; and C is the capacitor of the charging circuit.
In an embodiment, in the method for accelerating the charging speed of the lithium ion battery, the voltage after the charging is finished is
An apparatus for increasing the charging speed of a lithium ion battery, comprising:
the charging module is used for carrying out constant current charging Icc on the lithium ion battery;
the judging module is used for judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount;
the execution module is used for reducing the charging current for the first time if the voltage of the lithium ion battery reaches the sum of a full charge threshold and a first compensation amount, wherein the reduction amount is Icc/n, and the compensation amount is reduced to a second compensation amount in the same proportion; the judging module is further used for judging whether the current reduction frequency is n and whether the compensation quantity is zero, and the executing module is further used for ending the charging if the current reduction frequency is n and the compensation quantity is zero; and if the voltage of the lithium ion battery does not reach the sum of the first threshold value and the first compensation amount, continuing to perform the step of performing constant current charging Icc on the lithium ion battery.
In an embodiment, the execution module is further configured to continue charging if the voltage of the lithium ion battery does not reach the sum of the full charge threshold and the second compensation amount.
In an embodiment of the apparatus for increasing the charging speed of the lithium ion battery, the executing module is further configured to continue to execute S40 if the current reduction number does not reach n and the compensation amount does not decrease to zero.
Embodiments of the present application further provide a computer storage medium, where a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to implement the following steps:
s10, carrying out constant current charging Icc on the lithium ion battery;
s20, judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount;
s30, if the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, the charging current is reduced for the first time, the reduction amount is Icc/n, and the compensation amount is reduced to a second compensation amount in the same proportion; wherein n is a positive integer;
s40, if the voltage of the lithium ion battery reaches the sum of the full threshold and the second compensation amount, further reducing the charging current, and further reducing the compensation amount until judging whether the current reduction frequency is n and whether the compensation amount is zero;
s50, if the current reduction times is n and the compensation amount is reduced to zero, ending the charging;
and S20, judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, if the voltage of the lithium ion battery does not reach the sum of the first threshold and the first compensation amount, continuing to execute S10, and carrying out constant current charging Icc on the lithium ion battery.
The embodiment of the application provides a method for accelerating the charging speed of a lithium ion battery, which comprises the steps of carrying out constant current charging Icc on the lithium ion battery, judging whether the voltage of the lithium ion battery reaches the sum of a full charge threshold and a first compensation amount, if the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, reducing the charging current for the first time, wherein the reduction amount is Icc/n, and the compensation amount is reduced to a second compensation amount in the same proportion; if the voltage of the lithium ion battery reaches the sum of the full charge threshold and the second compensation amount, the charging current is further reduced, the compensation amount is further reduced, whether the current reduction frequency is n or not and whether the compensation amount is zero or not are judged, if the current reduction frequency is n and the compensation amount is zero, the charging is finished, whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount or not is judged, and if the voltage of the lithium ion battery does not reach the sum of the first threshold and the first compensation amount, S10 is continuously executed, and the constant current charging Icc is carried out on the lithium ion battery. In the repeated process, the charging current is further reduced, and the compensation amount is further reduced, which means that when the current reduction frequency is not n and the compensation amount reduction is not zero, the current is further reduced for the third time, the compensation amount is reduced to the third compensation amount in the same proportion, and so on until the current reduction frequency is n and the compensation amount is reduced to zero. In the process of current decrement, the compensation amount of each time is reduced in the same proportion, the target value of charging is higher than the full charge voltage by one compensation amount in each charging current period, and the compensation amount is larger when the current value is larger.
After the internal resistance compensation, the constant voltage charging time is obviously shortened, and the full-filling degree is also improved. The compensated current and voltage curves are as shown in fig. 6, and since the voltage falls back to the same magnitude each time, it can be seen from the geometrical relationship that the voltage rises again and experiences a parallelogram diagonal line, which is shorter than the rectangle without internal resistance compensation, i.e. the charging duration is shorter.
The function of compensating the internal resistance of the battery is added on the basis of the current decreasing technology, the circuit is simple and reliable to realize, the charging speed is obviously improved, and the full-charge voltage is optimized.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a charging curve diagram of a lithium battery chip according to an embodiment of the present disclosure.
Fig. 2 is a diagram of a current step-down charging architecture according to an embodiment of the present application.
FIG. 3 is a schematic diagram of an uncompensated current step-down provided in accordance with an embodiment of the present application;
fig. 4 is a schematic diagram of a charging circuit internal resistance compensation architecture according to an embodiment of the present disclosure;
fig. 5 is a schematic flow chart of a method for increasing a charging speed of a lithium ion battery according to an embodiment of the present application.
Fig. 6 is a schematic diagram of compensated current decrementing according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Referring to fig. 2, the present embodiment provides a charging mode of current-decreasing voltage successive approximation. The comparator C2 detects the output voltage in real time based on VREF, and once the output voltage is higher than a set value (e.g. 4.2V), the C2 gives an indication signal, and the control module receives the indication signal from C2 to control the current source ICSThe charging current is changed. Comparator C1 is responsible for detecting electricityAnd if the battery voltage is greater than 2.9V, switching between trickle charging and constant-current charging is completed. ESR and C in the dotted line frame are simplified lithium battery models, and the charging current I in constant current chargingBAT＝ICCWhen the battery voltage is higher than VREF (4.2V), the comparator C2 is turned over for the first time, and the control circuit (LOGIC) reduces the charging current to ICC(n-1)/n; the reduction of the charging current reduces the voltage drop on the internal resistance of the battery, and the voltage of the battery drops back to ESR ICCN, causing comparator C2 to reset; is charged withCCContinuing the current of (n-1)/n until C2 turns over again and then reduces the current to ICCN-2)/n, and so on until the charging current is reduced to ICCAnd after the charge is carried out until the C2 is turned over, the charge is terminated. In the figure, LOGIC is a control chip, C1 and C2 are comparators, and ESR and C are equivalent capacitance and equivalent resistance of the charging circuit.
Referring to fig. 3, the waveform of the battery voltage and the charging current in the full charge process is gradually decreased in current and gradually increased in voltage, so the charging method is called as a current-decreasing voltage successive approximation charging method. Where VF is VREF, the comparator C2 flip threshold, which is also the target full voltage. The charging mode of current decrement does not need to detect the termination current, has no control loop, and is simple and reliable; however, compared with the conventional charging method, the constant voltage charging time is longer, as shown in fig. 3, the dotted line is the conventional charging method, and in order to make the areas under the lines the same, the current gradual decrease method needs a longer time; although n can be increased, the gradually decreased broken line infinitely approaches to a continuous broken line, the circuit overhead is also increased, and in order to make up for the defect, the battery internal resistance compensation technology is invented on the basis of current decrease.
Referring to FIG. 4, in one embodiment of the present application, the required compensation voltage is obtained by calculating IBATESR. Wherein IBATFor the battery current, ESR is the charging circuit and the battery internal resistance, a compensation factor k is introduced during charging, where k-1 represents the maximum compensation amount and k-0 represents the minimum and no compensation. As can be seen from FIG. 4, after introducing the compensation, the threshold value of comparator C2 for each flip is
VBAT＝VREF+k*IBAT*ESR
With decreasing current, IBATAnd reducing the compensation voltage, reducing the compensation voltage to zero with the reduction of the current, and ending the charging. On one hand, the time or voltage range of large-current charging is prolonged; on the other hand, the compensation voltage amount is finally reduced to zero along with the reduction of the current, and overcharging cannot be caused. The compensation factor k may be an empirical value or may be obtained by fitting.
Referring to fig. 5, in an embodiment, a method for increasing a charging speed of a lithium ion battery includes:
s10, carrying out constant current charging Icc on the lithium ion battery;
s20, judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount;
s30, if the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, the charging current is reduced for the first time, the reduction amount is Icc/n, and the compensation amount is reduced to a second compensation amount in the same proportion; wherein n is a positive integer;
s40, if the voltage of the lithium ion battery reaches the sum of the full threshold and the second compensation amount, further reducing the charging current, further reducing the compensation amount, and judging whether the current reduction frequency is n and whether the compensation amount is zero;
s50, if the current reduction times is n and the compensation amount is reduced to zero, ending the charging;
and S20, judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, if the voltage of the lithium ion battery does not reach the sum of the first threshold and the first compensation amount, continuing to execute S10, and carrying out constant current charging Icc on the lithium ion battery.
In the repeated process of S40, the charging current is further decreased, and the compensation amount is further decreased, which means that when the current decrease frequency is not n and the compensation amount decrease is not zero, the current is further decreased for the third time, and the compensation amount is decreased proportionally to the third compensation amount, and so on until the current decrease frequency is n and the compensation amount decreases to zero. In the process of current decrement, the compensation amount of each time is reduced in the same proportion, the target value of charging is higher than the full charge voltage by one compensation amount in each charging current period, and the compensation amount is larger when the current value is larger.
In one embodiment, in S40, if the voltage of the lithium ion battery does not reach the sum of the full charge threshold and the second compensation amount, the charging is continued.
In one embodiment, in S50, if the current reduction number does not reach n and the compensation amount does not drop to zero, S40 is continuously performed.
In one embodiment, the trickle charge threshold voltage is assumed to be VTRFull of target voltage VFVREF at VTRTo VFDuring the charging period, constant current is always charged, and the current for stopping charging is ICCN, it can be shown that the time required for filling without compensation is
In one embodiment, the time required for full charge after compensation of internal resistance is
In one embodiment, the charging time can be shortened after the internal resistance compensation is that
In one embodiment, the uncompensated end-of-charge battery voltage is
In one embodiment, the battery voltage at the end of the charge after compensation is
Therefore, after the internal resistance compensation, the constant-voltage charging time is obviously shortened, and the full-charge degree is also improved. The compensated current and voltage curves are as shown in fig. 6, and since the voltage falls back to the same magnitude each time, it can be seen from the geometrical relationship that the voltage rises again and experiences a parallelogram diagonal line, which is shorter than the rectangle without internal resistance compensation, i.e. the charging duration is shorter.
The embodiment of the application increases the battery internal resistance compensation function on the basis of the current decrement technology, the circuit is simple and reliable to realize, the charging speed is obviously improved, and the full charge voltage is optimized.
The embodiment of the application also provides a device for accelerating the charging speed of the lithium ion battery. The device comprises:
the charging module is used for carrying out constant current charging Icc on the lithium ion battery;
the judging module is used for judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount;
the execution module is used for reducing the charging current for the first time if the voltage of the lithium ion battery reaches the sum of a full charge threshold and a first compensation amount, wherein the reduction amount is Icc/n, and the compensation amount is reduced to a second compensation amount in the same proportion; the step is further repeated if the voltage of the lithium ion battery reaches the sum of the full charge threshold and the second compensation amount, the judging module is further used for judging whether the current reduction frequency is n or not and whether the compensation amount is zero or not, and the executing module is further used for ending the charging if the current reduction frequency is n and the compensation amount is zero; and if the voltage of the lithium ion battery does not reach the sum of the first threshold value and the first compensation amount, continuing to execute S10 to perform constant current charging Icc on the lithium ion battery.
In one embodiment, the execution module is further configured to continue charging if the voltage of the lithium ion battery does not reach the sum of the full charge threshold and the second compensation amount.
In one embodiment, the execution module is further configured to continue to further reduce the charging current and further reduce the compensation amount if the current reduction number does not reach n and the compensation amount does not decrease to zero.
In one embodiment, the compensation threshold is k × IBATESR, where K is a real number from 0 to 1, IBATThe ESR is the current of the lithium ion battery and the internal resistance of the charging circuit and the battery.
In one embodiment, the time required to fully charge is:
wherein the trickle charge threshold voltage is VTRFull of target voltage VFVREF; at VTRTo VFDuring the period, the constant current is always ICCCharging; the current for terminating the charging is ICCN; and C is the capacitor of the charging circuit.
In one embodiment, the voltage after the end of charging is
Embodiments of the present application further provide a computer storage medium, where a computer program is stored on the computer readable storage medium, and the computer program is executed by a processor to implement the following steps:
s10, carrying out constant current charging Icc on the lithium ion battery;
s20, judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount;
s30, if the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, the charging current is reduced for the first time, the reduction amount is Icc/n, and the compensation amount is reduced to a second compensation amount in the same proportion; wherein n is a positive integer;
s40, if the voltage of the lithium ion battery reaches the sum of the full threshold and the second compensation amount, further reducing the charging current, and further reducing the compensation amount until judging whether the current reduction frequency is n and whether the compensation amount is zero;
s50, if the current reduction times is n and the compensation amount is reduced to zero, ending the charging;
and S20, judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, if the voltage of the lithium ion battery does not reach the sum of the first threshold and the first compensation amount, continuing to execute S10, and carrying out constant current charging Icc on the lithium ion battery.
In one embodiment, the computer program is executed by a processor to implement the steps of:
in S40, if the voltage of the lithium ion battery does not reach the sum of the full charge threshold and the second compensation amount, the charging is continued.
In one embodiment, the computer program is executed by a processor to implement the steps of:
in S50, if the current reduction count has not reached n and the compensation amount has not been reduced to zero, S40 is continued.
In one embodiment, the compensation threshold is k × IBATESR, where K is a real number from 0 to 1, IBATThe ESR is the current of the lithium ion battery and the internal resistance of the charging circuit and the battery.
In one embodiment, the time required to fully charge is:
wherein the trickle charge threshold voltage is VTRFull of target voltage VFVREF; at VTRTo VFDuring the period, the constant current is always ICCCharging; the current for terminating the charging is ICCN; and C is the capacitor of the charging circuit.
In one embodiment, the voltage after the end of charging is
Those skilled in the art will appreciate that the implementation of the modules such as the program and the terminal in the above embodiments can be accomplished by instructing related hardware through a computer program, where the computer program can be stored in a non-volatile computer-readable storage medium, and when executed, the computer program can include the flow of the above embodiments of the methods. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
In one embodiment, the present application further provides a computer storage medium, where the computer storage medium has a computer program stored thereon, and the computer program is executed by a processor to implement the following steps:
the technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for accelerating the charging speed of a lithium ion battery is characterized by comprising the following steps:
s10, carrying out constant current charging Icc on the lithium ion battery;
s20, judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount;
s30, if the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, the charging current is reduced for the first time, the reduction amount is Icc/n, and the compensation amount is reduced to a second compensation amount in the same proportion; wherein n is a positive integer;
s40, if the voltage of the lithium ion battery reaches the sum of the full threshold and the second compensation amount, further reducing the charging current, further reducing the compensation amount, and judging whether the current reduction frequency is n and whether the compensation amount is zero;
s50, if the current reduction times is n and the compensation amount is reduced to zero, ending the charging;
and S20, judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, if the voltage of the lithium ion battery does not reach the sum of the first threshold and the first compensation amount, continuing to execute S10, and carrying out constant current charging Icc on the lithium ion battery.
2. The method of claim 1, wherein in step S40, if the voltage of the li-ion battery does not reach the sum of the full charge threshold and the second compensation amount, the charging is continued.
3. The method of claim 2, wherein in S50, if the current reduction times does not reach n and the compensation amount does not decrease to zero, the method continues to S40.
4. The method of claim 3, wherein the compensation threshold is k x IBATESR, where K is a real number from 0 to 1, IBATIs the current of the lithium ion battery,
ESR is the charging circuit and battery internal resistance.
5. The method for accelerating the charging speed of a lithium ion battery according to claim 4, wherein the time required for full charging is:
wherein the trickle charge threshold voltage is VTRFull of target voltage VFVREF; at VTRTo VFDuring the period, the constant current is always ICCCharging; the current for terminating the charging is ICCN; and C is the capacitor of the charging circuit.
6. The method for increasing the charging speed of a lithium ion battery according to claim 5, wherein the voltage after the charging is finished is
7. An apparatus for accelerating the charging speed of a lithium ion battery, comprising:
the charging module is used for carrying out constant current charging Icc on the lithium ion battery;
the judging module is used for judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount;
the execution module is used for reducing the charging current for the first time if the voltage of the lithium ion battery reaches the sum of a full charge threshold and a first compensation amount, wherein the reduction amount is Icc/n, and the compensation amount is reduced to a second compensation amount in the same proportion; the judging module is further used for judging whether the current reduction frequency is n and whether the compensation quantity is zero, and the executing module is further used for ending the charging if the current reduction frequency is n and the compensation quantity is zero; and if the voltage of the lithium ion battery does not reach the sum of the first threshold value and the first compensation amount, continuing to perform the step of performing constant current charging Icc on the lithium ion battery.
8. The apparatus for increasing the charging speed of a lithium ion battery according to claim 7, wherein the execution module is further configured to continue charging if the voltage of the lithium ion battery does not reach the sum of the full charge threshold and the second compensation amount.
9. The apparatus for increasing the charging speed of a lithium ion battery according to claim 8, wherein the executing module is further configured to continue to execute S40 if the current reduction number does not reach n and the compensation amount does not decrease to zero.
10. A computer storage medium, having a computer program stored thereon, the computer program being executable by a processor to perform the steps of:
s10, carrying out constant current charging Icc on the lithium ion battery;
s20, judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount;
s30, if the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, the charging current is reduced for the first time, the reduction amount is Icc/n, and the compensation amount is reduced to a second compensation amount in the same proportion; wherein n is a positive integer;
s40, if the voltage of the lithium ion battery reaches the sum of the full threshold and the second compensation amount, further reducing the charging current, and further reducing the compensation amount until judging whether the current reduction frequency is n and whether the compensation amount is zero;
s50, if the current reduction times is n and the compensation amount is reduced to zero, ending the charging;
and S20, judging whether the voltage of the lithium ion battery reaches the sum of the full charge threshold and the first compensation amount, if the voltage of the lithium ion battery does not reach the sum of the first threshold and the first compensation amount, continuing to execute S10, and carrying out constant current charging Icc on the lithium ion battery.
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