CN108110349A - Battery charging method and device and computer readable storage medium - Google Patents
Battery charging method and device and computer readable storage medium Download PDFInfo
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- CN108110349A CN108110349A CN201711348604.5A CN201711348604A CN108110349A CN 108110349 A CN108110349 A CN 108110349A CN 201711348604 A CN201711348604 A CN 201711348604A CN 108110349 A CN108110349 A CN 108110349A
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- 238000007600 charging Methods 0.000 title claims abstract description 172
- 238000000034 method Methods 0.000 title claims abstract description 87
- 238000010278 pulse charging Methods 0.000 claims abstract description 39
- 238000007599 discharging Methods 0.000 claims description 43
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical group [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims description 6
- 230000008569 process Effects 0.000 abstract description 51
- 230000010287 polarization Effects 0.000 abstract description 22
- 230000000052 comparative effect Effects 0.000 description 27
- 239000006258 conductive agent Substances 0.000 description 8
- 238000009825 accumulation Methods 0.000 description 6
- 235000013547 stew Nutrition 0.000 description 6
- 230000014759 maintenance of location Effects 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 4
- 238000004134 energy conservation Methods 0.000 description 4
- 229910052744 lithium Inorganic materials 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000010277 constant-current charging Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000010280 constant potential charging Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000004519 manufacturing process Methods 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
- 238000001556 precipitation Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- 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
- 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
-
- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The embodiment of the invention provides a method and a device for charging a battery and a computer-readable storage medium, relates to the technical field of batteries, and can relieve the polarization phenomenon of the battery in the charging process of the battery, effectively improve the charging capacity of the battery and prolong the service life of the battery. On one hand, the embodiment of the invention charges the battery with constant power by using the first specified power until the state of charge of the battery reaches the first threshold value; then, pulse charging is carried out on the battery for at least one time, and the battery is stopped to be charged when the voltage of the battery reaches a charging cut-off voltage; wherein each pulse charge comprises: firstly, standing the battery; secondly, carrying out pulse discharge on the battery; and thirdly, charging the battery at a second specified power with constant power until the state of charge of the battery reaches a second threshold value. The method and the device are applied to the constant-power charging process of the battery.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of battery technologies, and in particular, to a method and an apparatus for charging a battery, and a computer-readable storage medium.
[ background of the invention ]
For charging the battery, the prior art mainly adopts a constant-current constant-voltage charging mode, that is, after the constant-current charging is performed to a certain voltage, the constant-voltage charging is performed to a charging cutoff current. However, in some battery application fields, such as the application technology field of frequency modulation and peak shaving of the power grid, since the control mode is the constant power control mode, the constant current and constant voltage charging mode cannot be adopted, and instead, the constant power charging mode is adopted.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
when the battery is charged by adopting a constant-power charging mode, the polarization phenomenon of the battery in the charging process cannot be relieved, the polarization accumulation of the battery in the charging process is realized, the charging capacity of the battery is reduced, and the service life of the battery is prolonged.
[ summary of the invention ]
In view of the above, embodiments of the present invention provide a method and an apparatus for charging a battery, and a computer-readable storage medium, so as to solve the problems of the prior art that, in a constant power charging process, battery polarization is accumulated, and a charging capacity and a service life of the battery are reduced.
In one aspect, an embodiment of the present invention provides a method for charging a battery, where the method includes:
charging the battery at constant power with a first specified power, and stopping until the state of charge of the battery reaches a first threshold;
performing pulse charging on a battery for at least one time until the voltage of the battery reaches a charging cut-off voltage, and stopping charging the battery;
wherein each pulse charge comprises:
standing the battery;
pulse discharging the battery;
and charging the battery at a second specified power with constant power until the state of charge of the battery reaches a second threshold value.
The above-described aspect and any possible implementation further provides an implementation in which the second threshold is equal to a sum of a threshold corresponding to an adjacent previous constant-power charge and an amplification threshold.
The above aspect and any possible implementation manner further provide an implementation manner, wherein during each pulse charging process, the discharging amount of pulse discharging the battery is smaller than the charging amount of constant power charging of the battery at a second specified power.
The above aspects and any possible implementations further provide an implementation in which the amount of discharge of the pulsed discharge is proportional to the power used in constant power charging.
The above aspect and any possible implementation manner further provide an implementation manner, wherein in each pulse charging process, the time for pulse discharging the battery is shorter than the time for constant power charging of the battery at the second specified power.
The above aspect and any possible implementation further provide an implementation, where the pulse discharging the battery includes:
pulse discharging the battery with a current, wherein the current is a constant current or a non-constant current;
or,
pulse discharging the battery with power, wherein the discharge power is constant power or non-constant power.
The above aspects, and any possible implementations, further provide an implementation,
when the battery is subjected to pulse discharge by using a constant current, the constant current is greater than or equal to 0.05C and less than or equal to 10C, wherein C is a rated charging current corresponding to the situation that the battery is fully charged within 1 hour;
or,
when the battery is subjected to pulse discharge by using constant discharge power, the constant discharge power is greater than or equal to 0.05P and less than or equal to 10P, wherein P is the corresponding rated charge power when the battery is fully charged within 1 hour.
The above aspect and any possible implementation further provide an implementation, wherein the time taken for pulse discharging in each pulse charging is greater than or equal to 0.1s and less than or equal to 300 s.
The above aspect and any possible implementation manner further provide an implementation manner, when the battery is a lithium iron phosphate battery, the first specified power and the second specified power are both 2P, and the pulse discharge is a constant power discharge, the first threshold is 70% of the rated capacity of the battery, the discharge power per pulse discharge is 0.1P, the discharge time is 5s, and the amplification threshold is 0.5% of the rated capacity of the battery.
The above-described aspects and any possible implementations further provide an implementation in which the first specified power is the same as the second specified power; or the first specified power is different from the second specified power.
In another aspect, an embodiment of the present invention further provides an apparatus for charging a battery, where the apparatus includes:
the first charging unit is used for charging the battery at constant power with first specified power and stopping until the state of charge of the battery reaches a first threshold value;
the second charging unit is used for carrying out pulse charging on the battery for at least one time until the voltage of the battery reaches a charging cut-off voltage, and stopping charging the battery;
wherein the second charging unit is specifically configured to:
standing the battery;
pulse discharging the battery;
and charging the battery at a second specified power with constant power until the state of charge of the battery reaches a second threshold value.
In another aspect, the present invention provides a computer-readable storage medium, including: computer-executable instructions which, when executed, perform the steps of:
charging the battery at constant power with a first specified power, and stopping until the state of charge of the battery reaches a first threshold;
performing pulse charging on a battery for at least one time until the voltage of the battery reaches a charging cut-off voltage, and stopping charging the battery;
wherein each pulse charge comprises:
standing the battery;
pulse discharging the battery;
and charging the battery at a second specified power with constant power until the state of charge of the battery reaches a second threshold value.
One of the above technical solutions has the following beneficial effects:
according to the technical scheme provided by the embodiment of the invention, firstly, constant power charging is carried out by using first specified power until the state of charge of a battery reaches a first threshold value, then, the battery is charged by adopting a pulse charging mode until the voltage of the battery reaches a charging cut-off voltage, wherein each pulse charging comprises the following steps: and standing the battery, performing pulse discharge on the battery, and performing constant-power charging on the battery at a second specified power until the state of charge of the battery reaches a second threshold value. In the technical scheme provided by the invention, after the state of charge of the battery reaches a first threshold value and before the voltage of the battery reaches a charge cut-off voltage, the battery is charged by adopting a pulse charging mode, and each pulse charging process comprises the following steps: the battery and the pulse discharge stew, at the in-process that charges, through setting up the battery and the pulse discharge stew of certain number of times to can effectively alleviate the polarization phenomenon that the battery produced at the charging process, reduce electric core appearance positive pole overpotential and the lithium risk of analysing, and then improve the security in the battery charging process, improve the life of battery. In addition, the charging method provided by the invention can realize effective reduction Of polarization phenomenon in the charging process Of the battery without providing an additional conductive agent for the battery and changing the energy density Of the battery or the State-Of-Charge (SOC) Of the battery, so that compared with the technical scheme Of adding the conductive agent or changing some parameters Of the battery, the technical scheme provided by the invention has low cost and increases the charging capacity Of the battery to a certain extent.
[ description of the 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 embodiments will be briefly described 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 to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for charging a battery according to an embodiment of the present invention;
fig. 2 is a charging parameter-time curve during charging by using the method for charging a battery according to the embodiment of the present invention;
FIG. 3 is a graph comparing the energy retention rate versus cycle number curves of the batteries of the comparative example and the example of the present invention;
fig. 4 is a schematic structural diagram of a device for charging a battery according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first, second, etc. may be used to describe specified powers in embodiments of the invention, these specified powers should not be limited by these terms. These terms are only used to distinguish specified powers from each other. For example, the first specified power may also be referred to as the second specified power, and similarly, the second specified power may also be referred to as the first specified power, without departing from the scope of embodiments of the present invention.
The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
In order to alleviate the problems of polarization accumulation of the battery during constant power charging, reduction of the charging capacity and service life of the battery, more conductive agent can be used in the battery to reduce the polarization phenomenon of the battery, but as the conductive agent in the battery is increased, the energy density of the battery is reduced, thereby increasing the cost. Alternatively, to mitigate battery polarization accumulation during constant power charging, reducing the available range of state of charge of the battery, which in effect reduces the available charge of the battery; alternatively, the charging power is reduced in the later stage of charging the battery, and the constant power charging is changed into the step power charging, so that the charging time is prolonged obviously.
In order to solve the problems in the prior art, an embodiment of the present invention provides a method for charging a battery, where a flow diagram of the method is shown in fig. 1, and the method includes:
101. and charging the battery at a first specified power with constant power until the state of charge of the battery reaches a first threshold value.
The first threshold may be set according to a material of the battery cell or a model of the battery, and the first threshold is not specifically limited in the present invention.
102. And carrying out pulse charging on the battery for at least one time until the voltage of the battery reaches a charging cut-off voltage, and stopping charging the battery.
It should be noted that, in step 102, the Battery is cyclically charged by pulses for several times, and after each pulse charging is performed, the BMS (Battery Management System) needs to acquire the voltage of the Battery in the current state, compare the voltage of the Battery in the current state with the charge cut-off voltage, and determine whether to stop charging the Battery. If the voltage in the current state is less than the charge cut-off voltage, circularly executing pulse charge for one time; and if the voltage in the current state is less than the charge cut-off voltage, stopping charging the battery.
Because a certain degree of chemical reaction and movement of electrons and ions are generated inside the battery along with the increase of the electric quantity of the battery, and a certain degree of battery polarization phenomenon is correspondingly generated in the chemical reaction and the movement of the electrons and the ions inside the battery, in order to relieve the accumulation of battery polarization, a cyclic pulse charging mode is adopted in the stage corresponding to the final stop of charging the battery after the state of charge of the battery reaches a first threshold value, wherein each pulse charging mode comprises the following steps:
step 1, standing the battery.
And 2, carrying out pulse discharge on the battery.
And 3, charging the battery at constant power with second specified power until the state of charge of the battery reaches a second threshold value.
After the primary constant power charging is executed and before the pulse discharging is executed, the battery is placed statically, so that the heat accumulation of the battery during the execution of the charging can be relieved, the internal temperature of the battery is reduced, the safety performance of the battery is improved, and the polarization phenomenon of the battery can be relieved to a certain extent; after the battery is placed statically, pulse discharge is carried out on the battery, so that the point position of the anode of the battery cell can be reduced, the problem of lithium precipitation of the battery cell can be solved, and the polarization phenomenon of the battery can be further solved by carrying out pulse discharge on the battery; and after the pulse discharge is carried out, the battery is charged with constant power by adopting second specified power, so that the electric quantity lost by the pulse discharge can be compensated, and the voltage of the battery can reach the charge cut-off voltage.
In order to ensure that the voltage of the battery can reach the charge cut-off voltage quickly during the pulse charging process of the battery, so as to reduce the time for charging the battery, the second threshold is equal to the sum of the threshold corresponding to the adjacent previous constant power charging and the amplification threshold.
In addition, in the charging process, the first specified power used in the initial charging period and the second specified power used in the pulse charging process can be the same; or, the first specified power used in the initial charging period may be different from the second specified power used in the pulse charging process, and the first specified power and the second specified power are not specifically limited in the present invention, and may be set according to the material of the battery electric core or the relevant performance parameter of the battery. In addition, it should be noted that the second specified power used in each pulse charging may be the same or different, and the relationship between the second specified powers used in each pulse charging is not specifically limited in the present invention.
According to the technical scheme provided by the embodiment of the invention, firstly, constant power charging is carried out by using first specified power until the state of charge of a battery reaches a first threshold value, then, the battery is charged by adopting a pulse charging mode until the voltage of the battery reaches a charging cut-off voltage, wherein each pulse charging comprises the following steps: and standing the battery, performing pulse discharge on the battery, and performing constant-power charging on the battery at a second specified power until the state of charge of the battery reaches a second threshold value. In the technical scheme provided by the invention, after the state of charge of the battery reaches a first threshold value and before the voltage of the battery reaches a charge cut-off voltage, the battery is charged by adopting a pulse charging mode, and each pulse charging process comprises the following steps: the battery and the pulse discharge stew, at the in-process that charges, through setting up the battery and the pulse discharge stew of certain number of times to can effectively alleviate the polarization phenomenon that the battery produced at the charging process, reduce electric core appearance positive pole overpotential and the lithium risk of analysing, and then improve the security in the battery charging process, improve the life of battery. In addition, the charging method provided by the invention can realize effective reduction Of polarization phenomenon in the charging process Of the battery without providing an additional conductive agent for the battery and changing the energy density Of the battery or the State-Of-Charge (SOC) Of the battery, so that compared with the technical scheme Of adding the conductive agent or changing some parameters Of the battery, the technical scheme provided by the invention has low cost and increases the charging capacity Of the battery to a certain extent.
Further, since there is a certain frequency of pulse discharge in the whole charging process, in order to ensure that the electric quantity of the battery is in an increased state in the pulse charging process, the discharge amount of pulse discharge performed on the battery in each pulse charging process is smaller than the charge amount of constant power charging performed on the battery with the second specified power.
Specifically, in order to realize that the discharge amount of pulse discharge is smaller than the charge amount of constant-power charging of the battery with the second specified power, in each pulse charging process, the pulse discharge time is adjusted to be smaller than the time of constant-power charging of the battery with the second specified power, so that the discharge amount of pulse discharge is smaller than the charge amount of constant-power charging of the battery with the second specified power. In order to ensure the efficiency of battery charging, the time for pulse discharging in each pulse charging is greater than or equal to 0.1s and less than or equal to 300 s. Or, in order to realize that the discharge amount of the pulse discharge is smaller than the charge amount of the constant-power charging of the battery at the second specified power, in each pulse charging process, the discharge amount of the pulse discharge can be smaller than the charge amount of the constant-power charging of the battery at the second specified power by adjusting the size of the relevant electric quantity parameters (such as the discharge current, the discharge power, the discharge voltage and the like) used in the discharging process; or, the discharging amount of the pulse discharging is smaller than the charging amount of the constant-power charging of the battery with the second specified power by adjusting the time in the discharging process and the related electric quantity parameter used in the discharging process.
Referring to fig. 2, fig. 2 is a graph of charging parameters versus time in a charging process by using the method for charging a battery according to the embodiment of the present invention. Wherein, the abscissa is time; the ordinate is the charging parameter used in the charging process by using the method provided by the invention, the process of constant power charging corresponds to the process above the abscissa, and the pulse discharging process corresponds to the process below the abscissa. In the graph, the area of the rectangular closed region formed by the abscissa and ordinate represents the charge amount of constant power charge or the discharge amount of pulse discharge of the battery.
It should be noted that the discharge amount of the pulse discharge is proportional to the power used in the constant power charging, and the greater the charging power used in the constant power charging, the more obvious the polarization phenomenon of the battery caused by the constant power charging, so in order to effectively improve the polarization phenomenon of the battery and prolong the service life of the battery, the discharge amount of the pulse discharge is increased. The discharge amount of the pulse discharge can be increased by increasing the pulse discharge time and/or increasing the relevant parameters (such as current, voltage, power, etc.) of the electric quantity used in the pulse discharge.
Further, the battery may be discharged in a current discharge manner, i.e., the battery is discharged in a pulse manner by using a current, wherein the current is a constant current or a non-constant current.
Specifically, when the battery is subjected to pulse discharge by using a constant current, the constant current of the pulse discharge is greater than or equal to 0.05C and less than or equal to 10C, wherein C is a rated charging current corresponding to a full charge of the battery for 1 hour.
Further, the battery can be subjected to pulse discharge by using power in a power discharge manner, wherein the discharge power is constant power or non-constant power.
Specifically, when the battery is subjected to pulse discharge by using constant discharge power, the constant discharge power is greater than or equal to 0.05P and less than or equal to 10P, wherein P is the rated charge power corresponding to the full charge of the battery for 1 hour.
Further, when the charging method provided by the invention is applied to a lithium iron phosphate battery, that is, when the battery is a lithium iron phosphate battery, the first specified power and the second specified power are both 2P, and pulse discharge is constant power discharge, the first threshold is 70% of the rated capacity of the battery, the power of each pulse discharge is 0.1P, the discharge time is 5s, and the amplification threshold is 0.5% of the rated capacity of the battery.
It should be added that, when the battery is a lithium iron phosphate battery, the first specified power and the second specified power are both 2P, and the pulse discharge is a constant power discharge, the first threshold is 70% of the rated capacity of the battery, and the pulse discharge may also be performed with a current of 0.1C for each discharge, with a discharge time of 5s and an amplification threshold of 0.5% of the rated capacity of the battery.
Based on the materials and the performance of the lithium iron phosphate battery, the polarization accumulation degree of the battery is relatively small before the charging capacity of the battery is 70% of the rated capacity of the battery, so that the charging time of the battery is shortened, and the first threshold is set as 70% of the rated capacity of the battery; in the process of pulse discharging, if the pulse discharging power or the pulse discharging current is smaller than a first value and/or the discharging time is smaller than a second value, the polarization phenomenon of the battery is relieved, so that the performance improvement effect of the battery charged by constant power is not obvious; if the pulse discharge power or the pulse discharge current is larger than the third numerical value and/or the discharge time is larger than the fourth numerical value, the pulse discharge causes excessive loss of the battery capacity, so that the charge time is long, therefore, in order to ensure that the battery electric quantity is not lost excessively due to discharge, the polarization phenomenon of the battery is effectively relieved, in the pulse discharge process, the pulse discharge power is 0.1P or the pulse discharge current is 0.1C, and the discharge time lasts for 5 s.
The following cycle tests were performed on comparative example one, comparative example two, comparative example three and the example using the present invention using the prior art, and the test results were compared.
Comparative example 1
a) During charging, the battery is charged at 2P (W) constant power to the charging termination voltage of nC constant current mode charging allowed by the battery.
b) Standing for 30 min.
c) When in discharging use, the battery is discharged to a constant current discharging allowable termination voltage at mP (W) constant power;
d) standing for 30 min.
And (c) performing the steps a) to d) for several times in a circulating manner, thereby obtaining the energy conservation rate-circulating number curve of the scheme of the comparative example.
Comparative example No. two
In order to further improve the service life and performance of the battery, the service life and performance of the battery were further improved by adjusting the end voltage during charging in comparative example on the basis of the scheme of comparative example one, and the scheme of comparative example two was as follows:
a) during charging, the battery is charged at 2P (W) constant power to a voltage less than the end-of-charge voltage of nC constant current charging allowed by the battery.
b) Standing for 30 min.
c) When in discharging use, the battery is discharged to a constant current discharging allowable termination voltage at mP (W) constant power;
d) standing for 30 min.
And (c) performing the steps a) to d) for several times in a circulating manner, thereby obtaining the energy conservation rate-circulating number curve of the scheme of the comparative example.
Comparative example No. three
Comparative example three is based on the scheme of comparative example one, and the battery service life and performance are further improved by adjusting the discharge termination voltage in the discharge process, and the scheme of comparative example three is as follows:
a) during charging, the battery is charged at 2P (W) constant power to the charging termination voltage of nC constant current mode charging allowed by the battery.
b) Standing for 30 min.
c) In discharging use, the battery is discharged at mP (W) constant power to a voltage above the constant current discharge allowed termination voltage.
d) Standing for 30 min.
And (c) performing the steps a) to d) for several times in a circulating way, thereby obtaining the energy conservation rate-circulating times curve of the third scheme of the comparative example.
Example one
a) In the charging process, the following steps are performed:
step one, a battery is charged to 80% SOC at a constant power of 2P (W).
And step two, standing for 2 s.
And step three, discharging the battery for 5s at a constant current of 0.1P (W).
And step four, charging the battery at 2P1(W) constant power to be 0.5% higher than the SOC value obtained by the constant power charging in the last step.
And step five, continuously and circularly executing the step two to the step four until the battery reaches the charging termination voltage.
b) And standing for 30 mins.
c) During discharging use, the battery is discharged at mP1(W) constant power to a constant current discharge allowing the voltage to be terminated.
d) Standing for 30 min.
The steps a) to d) are executed in a circulating way for a plurality of times, so that the curve of the energy conservation rate and the circulating times of the embodiment is obtained.
In order to more intuitively show to those skilled in the art that the technical scheme provided by the embodiment of the invention can improve the service life and performance of the battery, the energy retention rate-cycle number curves of the first comparative example, the second comparative example, the third comparative example and the first embodiment are shown by fig. 3, as shown in fig. 3, the energy retention rate-cycle number curves of the battery in the first comparative example and the second embodiment of the invention are compared, as the number of cycles of the battery is increased, the energy retention rate of the battery in the first example is obviously lower than that of the first comparative example and the second comparative example, and the energy retention rate of the battery in the first example is also obviously lower than that of the third comparative example as compared with that of the first comparative example in the comparative example shown in the comparative example 3, so that the scheme of the first example is also obviously lower than that of the first comparative example, Compared with the scheme provided by the second comparison example and the third comparison example, the service life and the performance of the battery can be obviously improved without changing parameters in the discharging and using process of the battery.
It should be noted that, in order to significantly improve the service life and performance of the battery, the scheme of the first embodiment may also change the discharge termination voltage during the discharge process to further improve the service life and performance of the battery
It should be noted that, when the scheme provided by the present invention is used, the relevant parameter value in the charging process is not limited to the parameter value provided in the first implementation, and the relevant parameter value in the charging process may be set as needed, as shown in the second and third embodiments below, and the present invention does not specifically limit the relevant parameter value in the charging process, as long as the set parameter value is within the specified range.
Example two
a) In the charging process, the following steps are performed:
step one, the battery is charged to 80% SOC at 2P1(W) constant power.
And step two, standing for 2 s.
And step three, discharging the battery for 3s at a constant current of 0.1C1 (A).
And step four, charging the battery at 2P1(W) constant power to be 0.5% higher than the SOC value obtained by the constant power charging in the last step.
And step five, continuously and circularly executing the step two to the step four until the battery reaches the charging termination voltage.
b) And standing for 30 mins.
c) Discharging the battery at mP1(W) constant power to constant current discharge allows the voltage to be terminated.
d) Standing for 30 min.
EXAMPLE III
a) In the charging process, the following steps are performed:
step one, the battery is charged to 70% SOC at a constant power of 4P1 (W).
And step two, standing for 2 s.
And step three, discharging the battery for 5s at a constant current of 0.1C1 (A).
And step four, charging the battery at a constant power of 4P1(W) until the SOC value is 0.5 percent higher than the SOC value obtained by the constant power charging in the last step.
And step five, continuously circulating the step two to the step four until the battery reaches the charging termination voltage.
b) And standing for 30 mins.
c) Discharging the battery at mP1(W) constant power to constant current discharge allows the voltage to be terminated.
d) Standing for 30 min.
An embodiment of the present invention provides a device for charging a battery, where a schematic structural diagram of the device is shown in fig. 4, and the device includes:
the first charging unit 21 is configured to perform constant-power charging on the battery at a first specified power, and stop the constant-power charging until the state of charge of the battery reaches a first threshold.
And a second charging unit 22 for pulse charging the battery at least once until the voltage of the battery reaches a charge cut-off voltage, and stopping charging the battery.
The second charging unit 22 is specifically configured to:
and standing the battery.
And discharging the battery in a pulse mode.
And charging the battery at a second specified power with constant power until the state of charge of the battery reaches a second threshold value.
An embodiment of the present invention further provides a computer-readable storage medium, including: computer-executable instructions which, when executed, perform the steps of:
and charging the battery at a first specified power with constant power until the state of charge of the battery reaches a first threshold value.
And carrying out pulse charging on the battery for at least one time until the voltage of the battery reaches a charging cut-off voltage, and stopping charging the battery.
Wherein each pulse charge comprises:
standing the battery;
pulse discharging the battery;
and charging the battery at a second specified power with constant power until the state of charge of the battery reaches a second threshold value.
According to the technical scheme provided by the embodiment of the invention, firstly, constant power charging is carried out by using first specified power until the state of charge of a battery reaches a first threshold value, then, the battery is charged by adopting a pulse charging mode until the voltage of the battery reaches a charging cut-off voltage, wherein each pulse charging comprises the following steps: and standing the battery, performing pulse discharge on the battery, and performing constant-power charging on the battery at a second specified power until the state of charge of the battery reaches a second threshold value. In the technical scheme provided by the invention, after the state of charge of the battery reaches a first threshold value and before the voltage of the battery reaches a charge cut-off voltage, the battery is charged by adopting a pulse charging mode, and each pulse charging process comprises the following steps: the battery and the pulse discharge stew, at the in-process that charges, through setting up the battery and the pulse discharge stew of certain number of times to can effectively alleviate the polarization phenomenon that the battery produced at the charging process, reduce electric core appearance positive pole overpotential and the lithium risk of analysing, and then improve the security in the battery charging process, improve the life of battery. In addition, the charging method provided by the invention can realize effective reduction Of polarization phenomenon in the charging process Of the battery without providing an additional conductive agent for the battery and changing the energy density Of the battery or the State-Of-Charge (SOC) Of the battery, so that compared with the technical scheme Of adding the conductive agent or changing some parameters Of the battery, the technical scheme provided by the invention has low cost and increases the charging capacity Of the battery to a certain extent.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the embodiments provided in the present invention, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and there may be other divisions in actual implementation, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
The integrated unit implemented in the form of a software functional unit may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device) or a Processor (Processor) to execute some steps of the methods according to the embodiments of the present invention. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (12)
1. A method of charging a battery, the method comprising:
charging the battery at constant power with a first specified power, and stopping until the state of charge of the battery reaches a first threshold;
performing pulse charging on a battery for at least one time until the voltage of the battery reaches a charging cut-off voltage, and stopping charging the battery;
wherein each pulse charge comprises:
standing the battery;
pulse discharging the battery;
and charging the battery at a second specified power with constant power until the state of charge of the battery reaches a second threshold value.
2. The method of claim 1, wherein the second threshold is equal to a sum of a threshold and an amplification threshold corresponding to an adjacent previous constant power charge.
3. The method of claim 1, wherein each pulsed charge cycle discharges a battery less than a constant charge at a second specified power.
4. The method of claim 3, wherein the amount of discharge of the pulsed discharge is directly proportional to the power used in constant power charging.
5. The method of claim 3, wherein the time for pulse discharging the battery during each pulse charging is less than the time for constant power charging the battery at the second specified power.
6. The method of claim 1, wherein the pulse discharging the battery comprises:
pulse discharging the battery with a current, wherein the current is a constant current or a non-constant current;
or,
pulse discharging the battery with power, wherein the discharge power is constant power or non-constant power.
7. The method of claim 6,
when the battery is subjected to pulse discharge by using a constant current, the constant current is greater than or equal to 0.05C and less than or equal to 10C, wherein C is a rated charging current corresponding to the situation that the battery is fully charged within 1 hour;
or,
when the battery is subjected to pulse discharge by using constant discharge power, the constant discharge power is greater than or equal to 0.05P and less than or equal to 10P, wherein P is the corresponding rated charge power when the battery is fully charged within 1 hour.
8. The method according to claim 1 or 5, wherein the time for pulse discharge is greater than or equal to 0.1s and less than or equal to 300s per pulse charge.
9. The method of claim 2, wherein when the battery is a lithium iron phosphate battery, the first specified power and the second specified power are both 2P, and the pulsed discharge is a constant power discharge, the first threshold is 70% of the rated capacity of the battery, the discharge power per pulsed discharge is 0.1P, the discharge time is 5s, and the amplification threshold is 0.5% of the rated capacity of the battery.
10. The method of claim 1, wherein the first specified power is the same as the second specified power; or the first specified power is different from the second specified power.
11. An apparatus for charging a battery, the apparatus comprising:
the first charging unit is used for charging the battery at constant power with first specified power and stopping until the state of charge of the battery reaches a first threshold value;
the second charging unit is used for carrying out pulse charging on the battery for at least one time until the voltage of the battery reaches a charging cut-off voltage, and stopping charging the battery;
wherein the second charging unit is specifically configured to:
standing the battery;
pulse discharging the battery;
and charging the battery at a second specified power with constant power until the state of charge of the battery reaches a second threshold value.
12. A computer-readable storage medium, comprising: computer-executable instructions which, when executed, perform the steps of:
charging the battery at constant power with a first specified power, and stopping until the state of charge of the battery reaches a first threshold;
performing pulse charging on a battery for at least one time until the voltage of the battery reaches a charging cut-off voltage, and stopping charging the battery;
wherein each pulse charge comprises:
standing the battery;
pulse discharging the battery;
and charging the battery at a second specified power with constant power until the state of charge of the battery reaches a second threshold value.
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