CN115693809A - Charging method, device, equipment and storage medium - Google Patents
Charging method, device, equipment and storage medium Download PDFInfo
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- CN115693809A CN115693809A CN202110834261.3A CN202110834261A CN115693809A CN 115693809 A CN115693809 A CN 115693809A CN 202110834261 A CN202110834261 A CN 202110834261A CN 115693809 A CN115693809 A CN 115693809A
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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
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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 application discloses a charging method, a charging device, charging equipment and a storage medium, and belongs to the technical field of charging. The method comprises the following steps: circularly executing a plurality of charging operations on the lithium battery until a charging cut-off condition is met; wherein the charging operation includes: and carrying out first-stage charging on the lithium battery by using a first charging current, and increasing the negative electrode potential of the lithium battery after the first-stage charging is finished. The technical scheme provided by the embodiment of the application can improve the charging efficiency of the lithium battery on the premise of avoiding the phenomenon of lithium precipitation of the lithium battery.
Description
Technical Field
The present disclosure relates to the field of charging technologies, and in particular, to a charging method, a charging apparatus, a charging device, and a storage medium.
Background
Currently, lithium batteries are becoming more and more common as a type of rechargeable battery in people's daily lives. In the process of charging a lithium battery, lithium ions in the lithium battery are extracted from a positive electrode of the lithium battery, diffused to a negative electrode of the lithium battery, and inserted into the negative electrode of the lithium battery. In some cases, lithium ions may not be normally inserted into the negative electrode of the lithium battery, and at this time, the lithium ions may capture electrons at the negative electrode of the lithium battery to form lithium ions which are precipitated out of the negative electrode of the lithium battery, and this phenomenon is called lithium precipitation, which accelerates the aging of the lithium battery.
In the related technology, the negative electrode potential of the lithium battery can be controlled to be always kept above the lithium-separation critical potential (generally 0V) in the charging process so as to ensure that lithium ions can not capture electrons at the negative electrode of the lithium battery, and thus the occurrence of the lithium-separation phenomenon is fundamentally avoided.
However, in order to control the negative electrode potential of the lithium battery to be always kept above the lithium deposition critical potential during the charging process, it is necessary to ensure that the charging current is always kept at a low level.
Disclosure of Invention
Based on this, the embodiment of the application provides a charging method, a charging device, charging equipment and a storage medium, which can improve the charging efficiency of a lithium battery on the premise of avoiding the lithium precipitation phenomenon of the lithium battery.
In a first aspect, a charging method is provided, which includes:
circularly executing multiple charging operations on the lithium battery until a charging cut-off condition is met;
wherein the charging operation comprises:
and carrying out first-stage charging on the lithium battery by using a first charging current, and after the first-stage charging is finished, increasing the negative electrode potential of the lithium battery.
In a second aspect, there is provided a charging device, the device comprising:
the charging module is used for circularly executing multiple charging operations on the lithium battery until a charging cut-off condition is met;
wherein the charging module includes:
the charging unit is used for carrying out first-stage charging on the lithium battery by utilizing first charging current;
and the processing unit is used for increasing the negative electrode potential of the lithium battery after the first-stage charging is finished.
In a third aspect, an electronic device is provided, comprising a memory and a processor, the memory storing a computer program, the computer program implementing the charging method according to the first aspect when executed by the processor.
In a fourth aspect, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the charging method as described in the first aspect above.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the lithium battery is circularly charged for multiple times until a charge cut-off condition is met, wherein the charge operation comprises the steps of carrying out first-stage charge on the lithium battery by using first charge current, and after the first-stage charge is finished, the negative electrode potential of the lithium battery is increased.
Drawings
Fig. 1 is a flowchart of a charging method according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a variation of a negative electrode potential according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of the change of the negative electrode potential according to the embodiment of the present application
Fig. 4 is a flowchart of a charging method according to an embodiment of the present disclosure;
fig. 5 is a flowchart of a charging method according to an embodiment of the present disclosure;
fig. 6 is a flowchart of a charging method according to an embodiment of the present disclosure;
fig. 7 is a flowchart of a charging method according to an embodiment of the present disclosure;
fig. 8 is a flowchart of a charging method according to an embodiment of the present disclosure;
fig. 9 is a block diagram of a charging device according to an embodiment of the present application;
fig. 10 is a block diagram of an electronic device according to an embodiment of the present application.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In practical applications, during the process of charging a lithium battery, lithium ions in the lithium battery are desorbed from a positive electrode of the lithium battery, diffused to a negative electrode of the lithium battery, and inserted into the negative electrode of the lithium battery. In some cases, lithium ions may not be normally inserted into the negative electrode of the lithium battery, and at this time, the lithium ions may capture electrons in the negative electrode of the lithium battery to form lithium ions which are precipitated out of the negative electrode of the lithium battery, and this phenomenon is called lithium precipitation, wherein the chemical expression of the lithium precipitation is:
Li + +e - —Li。
generally, the phenomenon of lithium separation usually occurs in the scenes of a fast charging process, a low-temperature charging process, battery aging and the like, and the phenomenon of lithium separation occurs in the fast charging process because: in the quick charging process, the speed of lithium ions inserted into the negative electrode of the lithium battery is lower than the rated multiplying power, so that the lithium ions can be enriched on the surface of the negative electrode of the lithium battery; the lithium evolution phenomenon occurs during low temperature charging because: the low temperature causes the diffusion activity of lithium ions to be reduced, so that the speed of lithium ions being inserted into the negative electrode of the lithium battery is slowed, and the lithium ions are enriched on the surface of the negative electrode of the lithium battery; the phenomenon of lithium evolution occurs in the context of battery aging because: the internal resistance of the lithium battery is increased by a Solid Electrolyte Interface (SEI) film generated by battery side reaction in the aged battery, according to a negative electrode potential expression: phi (anode) = phi (e) + delta phi, phi (anode) is the negative electrode potential of the lithium battery, phi (e) is the lithium precipitation equilibrium potential, delta phi is the potential due to the internal resistance of the lithium battery, and delta phi < 0, it can be seen that: because the increase of the internal resistance of the lithium battery can cause the potential delta phi generated by the internal resistance of the lithium battery to decrease, the increase of the internal resistance of the lithium battery can cause the negative electrode potential of the lithium battery to be more easily lower than the lithium deposition critical potential (generally 0V), so that the lithium deposition phenomenon is more easily caused.
In addition, lithium simple substance is generally separated out in the form of lithium dendrite, and the lithium dendrite may pierce through a diaphragm in the lithium battery, so that the lithium battery is overheated and even brings the risk of short circuit of a positive electrode and a negative electrode to the lithium battery.
As can be seen from the above description, the lithium precipitation phenomenon accelerates the aging of the lithium battery, and even brings a safety risk to the use of the lithium battery. Therefore, in the process of charging the lithium battery, measures are usually required to avoid the occurrence of the lithium precipitation phenomenon.
In the related technology, the negative electrode potential of the lithium battery can be controlled to be always kept above the lithium-separation critical potential in the charging process so as to ensure that lithium ions can not capture electrons at the negative electrode of the lithium battery, thereby fundamentally avoiding the occurrence of the lithium-separation phenomenon.
However, in order to control the negative electrode potential of the lithium battery to be kept above the lithium deposition critical potential all the time during the charging process, it is necessary to ensure that the charging current is always kept at a low level, and since the magnitude of the charging current directly affects the charging efficiency of the lithium battery, ensuring that the charging current is always kept at a low level may result in the charging efficiency of the lithium battery being low.
In view of this, embodiments of the present application provide a charging method, an apparatus, a device, and a storage medium, which can improve charging efficiency of a lithium battery on the premise of avoiding a lithium precipitation phenomenon of the lithium battery.
It should be noted that the execution subject of the charging method provided in the embodiments of the present application may be a charging device, and the charging device may be implemented as part or all of an electronic device by software, hardware, or a combination of software and hardware. The electronic device is provided with a lithium battery, and the electronic device can be a smart phone, a tablet computer, a wearable device, a vehicle-mounted device, an electronic book reader, an MP3 player or an MP4 player, and the like.
It should be further noted that a charging control chip may also be disposed in the electronic device, and the charging method provided in the embodiment of the present application may be specifically executed by the charging control chip in the electronic device.
Please refer to fig. 1, which shows a flowchart of a charging method provided in an embodiment of the present application, and the charging method can be applied to the above electronic device. As shown in fig. 1, the charging method may include the following technical processes:
the electronic equipment circularly executes a plurality of charging operations on the lithium battery until a charging cutoff condition is met.
In a possible implementation manner, the electronic device may monitor a battery state of the lithium battery during the charging operation that is performed cyclically, and the electronic device may stop performing the charging operation when the monitored battery state meets a charge cut-off condition. Optionally, after stopping performing the charging operation, the electronic device may further perform a subsequent charging process on the lithium battery until the lithium battery is fully charged. The battery state monitored during the cyclic execution of the charging operation may include: the temperature of the lithium battery, the battery voltage of the lithium battery, and the like, which are not particularly limited in this application example.
In another possible implementation manner, during the charging operation, the electronic device may record the number of times of performing the charging operation in a cycle, and in a case that the number of times of performing the cycle reaches a certain threshold, it is considered that the charging cutoff condition is met, at this time, the electronic device may stop performing the charging operation. Optionally, after stopping performing the charging operation, the electronic device may further perform a subsequent charging process on the lithium battery until the lithium battery is fully charged.
In yet another possible implementation manner, during the charging operation is performed cyclically by the electronic device, a time length of the charging operation being performed cyclically may be recorded, and in a case that the time length reaches a certain time length threshold, it is considered that the charging cutoff condition is met, at which time the electronic device may stop performing the charging operation. Optionally, after stopping performing the charging operation, the electronic device may further perform a subsequent charging process on the lithium battery until the lithium battery is fully charged.
In another possible implementation manner, the electronic device may perform multiple charging operations on the lithium battery cyclically in the constant-current charging stage, and in a case that it is detected that the lithium battery meets the switching condition for switching the constant-current charging stage to the constant-voltage charging stage, it may be considered that the charging cutoff condition is met, and at this time, the electronic device may stop performing the charging operation. Optionally, after stopping performing the charging operation, the electronic device may further perform a subsequent charging process on the lithium battery until the lithium battery is fully charged, in which case the subsequent charging process may be a constant-voltage charging process.
The above switching condition for switching the constant-current charging stage to the constant-voltage charging stage may be: the battery voltage reaches the charge cut-off voltage of the constant-current charging phase, wherein the charge cut-off voltage may be the rated cut-off voltage of the battery or may be greater than the rated cut-off voltage of the battery, for example, the charge cut-off voltage may be the sum of the rated cut-off voltage of the electric potential and a fixed value, wherein the fixed value may be 0.05V.
In addition, the switching condition for switching the constant current charging phase to the constant voltage charging phase as described above may be: the charging voltage reaches a preset charging voltage value, or the charging duration of the constant current charging stage reaches a preset charging duration value, and the like.
The charging process of the lithium battery generally comprises a constant current charging stage and a constant voltage charging stage, in the constant current charging stage, the lithium battery can be charged by relatively constant charging current, in the constant current charging stage, the battery voltage of the lithium battery gradually rises, under the condition that the battery voltage of the lithium battery reaches a certain voltage threshold value, the lithium battery can be considered to meet the switching condition that the constant current charging stage is switched to the constant voltage charging stage, at the moment, the constant voltage charging stage can be entered, in the constant voltage charging stage, the lithium battery can be charged by relatively constant charging voltage, in the constant voltage charging stage, the charging current continuously drops, and the charging is stopped until the charging current drops to a certain smaller value.
Next, in the embodiment of the present application, a technical process of a primary charging operation performed by an electronic device will be briefly described with reference to fig. 1, and as shown in fig. 1, the technical process includes step 101 and step 102.
Alternatively, the first charging current may be equal to or greater than the lithium deposition critical current value.
Since the first charging current is equal to or greater than the lithium evolution critical current value, the potential of the negative electrode of the lithium battery is equal to or less than the lithium evolution critical potential during the first stage charging, wherein the lithium evolution critical potential may be 0V.
Generally, charging the lithium battery with a larger first charging current (greater than or equal to the lithium deposition critical current value) results in a negative electrode potential of the lithium battery being less than or equal to the lithium deposition critical potential, and under the condition that the negative electrode potential of the lithium battery is less than or equal to the lithium deposition critical potential, lithium ions may capture electrons at the negative electrode of the lithium battery to form a lithium simple substance, that is, a lithium deposition phenomenon may occur.
In an alternative embodiment of the present application, the electronic device may determine the first charging current according to a preset first negative electrode potential, where the first negative electrode potential may be equal to or less than a lithium deposition critical potential.
In this embodiment of the present application, the first negative electrode potential may be a potential value preset locally in the electronic device, or may be a potential value obtained by the electronic device according to a battery state of the lithium battery, or may be a negative electrode potential value of the lithium battery that is obtained by the electronic device and is charged in a first stage in a historical charging operation process.
The technical process that the electronic device correspondingly obtains the potential of the first negative electrode according to the battery state of the lithium battery can be as follows: the electronic equipment queries a negative potential database preset in the local electronic equipment according to the battery state of the lithium battery, wherein the negative potential database stores a plurality of corresponding relations between the battery state of the lithium battery and the negative potential, and the electronic equipment can use the queried negative potential as the first negative potential.
In addition, the technical process that the electronic device correspondingly obtains the first negative electrode potential according to the battery state of the lithium battery can also be as follows: the electronic device sends the battery state of the lithium battery to the server, so that the server queries a negative potential database according to the battery state of the lithium battery, wherein a plurality of corresponding relations between the battery state of the lithium battery and the negative potential are stored in the negative potential database, the server can send the queried negative potential to the electronic device, and the electronic device can use the negative potential sent by the server as the first negative potential.
It should be noted that, similarly to the above description, the battery state of the lithium battery referred to herein may include: the temperature of the lithium battery, the battery voltage of the lithium battery, and the like, which are not particularly limited in this application example. The method for acquiring the first negative electrode potential according to the battery state of the lithium battery can fully consider various conditions of aging of the lithium battery and the like, so that the acquired first negative electrode potential is more accurate.
The inventor of the present application finds that lithium ions inserted into the negative electrode of the lithium battery are gradually increased during the charging operation performed cyclically, and difficulty of lithium ions being inserted into the negative electrode of the lithium battery is gradually increased during the charging operation performed cyclically due to the repulsion of the same poles, so that the lithium deposition phenomenon is more likely to occur as the number of cycles increases during the charging operation performed cyclically.
In order to avoid that all precipitated lithium simple substances cannot be converted into lithium ions to be inserted into the negative electrode of the lithium battery in the subsequent step due to the serious lithium precipitation degree in the first-stage charging process, in an optional embodiment of the present application, the first negative electrode potentials corresponding to the respective charging operations may be different among the multiple charging operations that are executed in a circulating manner.
The first charging current corresponding to each charging operation in the plurality of charging operations executed in a cycle may be inversely related to the execution order of each charging operation in the cycle, and correspondingly, the first negative electrode potential corresponding to each charging operation in the plurality of charging operations executed in a cycle may be positively related to the execution order of each charging operation in the cycle.
In other words, the charging operation performed later in the cycle may be made to correspond to a smaller first charging current and a larger first negative electrode potential (i.e., closer to the lithium deposition critical potential), for example, the first negative electrode potential corresponding to the charging operation performed 100 th time is larger than the first negative electrode potential corresponding to the charging operation performed 99 th time, and the first charging current corresponding to the charging operation performed 100 th time is smaller than the first charging current corresponding to the charging operation performed 99 th time.
Reduce first charging current gradually in the cycle process, increase first negative pole potential, can increase the degree of difficulty that the lithium phenomenon appears of analyzing gradually, thereby offset and analyze the situation that the lithium phenomenon can appear more easily along with the increase of cycle number, consequently, can avoid causing more serious lithium of analyzing more in the cycle process more the charging operation of carrying out after, avoid leading to can't becoming the lithium simple substance that separates out and all becoming the negative pole that lithium ion imbeds the lithium cell because of first stage charging process is analyzed lithium degree seriously, thereby further guarantee that the lithium cell does not appear in the charging operation in-process and analyze the lithium phenomenon.
In a possible implementation manner, in the first-stage charging process, the first charging current is kept unchanged, correspondingly, the negative electrode potential of the lithium battery is also kept unchanged in the first-stage charging process, and optionally, the negative electrode potential of the lithium battery in the first-stage charging process may be kept unchanged as described above.
It should be noted that, in the embodiments of the present application, the concept of being kept constant should be understood to be expanded, that is, the keeping constant may be always equal to a certain value or may always fluctuate around a certain value. The first charging current is kept unchanged in the first-stage charging process, so that the control complexity of the first-stage charging can be reduced, and the calculation amount of the electronic equipment in the first-stage charging process is reduced.
In another possible implementation manner, the first charging current is reduced in the first stage charging process, for example, the first charging current may be reduced from a first current value to a second current value, and correspondingly, the negative electrode potential of the lithium battery may be increased from a third potential to a fourth potential in the first stage charging process, where both the third potential and the fourth potential may be less than or equal to the lithium deposition critical potential, and the third potential may be the first negative electrode potential described above.
Optionally, in this embodiment of the application, the first charging current may be linearly reduced from the first current value to the second current value, or may be nonlinearly reduced from the first current value to the second current value, that is, in the first-stage charging process, a change rate of the first charging current may be kept unchanged, or may be changed, for example, the change rate of the first charging current may be gradually reduced or gradually increased, which is not specifically limited in this embodiment of the application.
Correspondingly, in the first-stage charging process, the negative electrode potential of the lithium battery may be linearly increased from the third potential to the fourth potential, or may be nonlinearly increased from the third potential to the fourth potential, that is, in the first-stage charging process, the change rate of the negative electrode potential of the lithium battery may be kept unchanged, or may be changed, for example, the change rate of the negative electrode potential of the lithium battery may be gradually decreased or gradually increased, which is not specifically limited in this embodiment of the present application.
The first charging current is gradually reduced in the first-stage charging process, the negative electrode potential of the lithium battery is gradually increased in the first-stage charging process, and the lithium analysis degree of the lithium battery can be gradually reduced in the first-stage charging process, so that the lithium simple substance separated out in the first charging stage of the lithium battery can be favorably converted into the negative electrode of the lithium ion embedded lithium battery in the subsequent steps, the situation that the separated lithium simple substance cannot be completely converted into the negative electrode of the lithium ion embedded lithium battery due to the serious lithium analysis degree in the first-stage charging process is avoided, and the lithium analysis phenomenon of the lithium battery in the charging operation process is further avoided.
And 102, after the first-stage charging is finished, the electronic equipment raises the negative electrode potential of the lithium battery.
Alternatively, the potential of the negative electrode after the raising treatment may be equal to or greater than the lithium deposition critical potential. The negative electrode potential of the lithium battery is increased, an environment for converting the separated lithium simple substance into the negative electrode of the lithium ion embedded lithium battery can be provided for the lithium battery, and the lithium simple substance separated out in the first charging stage of the lithium battery can be converted into the negative electrode of the lithium ion embedded lithium battery.
The inventor of the application finds that slight lithium precipitation is generally reversible, that is, lithium simple substance precipitated by the phenomenon of slight lithium precipitation can be generally converted into lithium ions to be inserted into the negative electrode of the lithium battery again. Based on the principle, after the first-stage charging is finished, the electronic equipment can raise the potential of the negative electrode of the lithium battery so as to convert the lithium simple substance separated out from the lithium battery in the first charging stage into the negative electrode of the lithium ion embedded lithium battery, thereby avoiding the phenomenon of lithium separation in the charging process.
In a possible implementation manner, the electronic device raises the negative electrode potential of the lithium battery and controls the negative electrode potential of the lithium battery to be kept unchanged.
In general, if the first charging current is kept constant during the first stage charging process and the negative electrode potential of the lithium battery is kept constant, the electronic device may correspondingly raise the negative electrode potential of the lithium battery and control the negative electrode potential of the lithium battery to be kept constant.
Optionally, the negative electrode potential of the lithium battery may be kept unchanged, where the fifth potential may be a potential value preset locally in the electronic device, or an obtained potential value corresponding to the battery state of the lithium battery by the electronic device, or a negative electrode potential value of the lithium battery obtained after the negative electrode potential is increased in the historical charging operation process by the electronic device.
The technical process that the electronic device correspondingly obtains the fifth potential according to the battery state of the lithium battery is the same as the technical process that the electronic device correspondingly obtains the first negative electrode potential according to the battery state of the lithium battery, and the embodiment of the application is not described herein again.
The method for acquiring the fifth potential according to the battery state of the lithium battery can fully consider various conditions of aging of the lithium battery and the like, so that the acquired fifth potential is more accurate.
In another possible implementation manner, the electronic device performs an increasing process on the negative electrode potential of the lithium battery and controls the negative electrode potential of the lithium battery to be reduced from the first potential to the second potential.
In general, if the first charging current is reduced from the first current value to the second current value during the first stage charging process, and the negative electrode potential of the lithium battery is increased from the third potential to the fourth potential, the electronic device may correspondingly increase the negative electrode potential of the lithium battery and control the negative electrode potential of the lithium battery to be reduced from the first potential to the second potential.
Optionally, in this embodiment of the present application, the negative electrode potential of the lithium battery may be linearly reduced from the first potential to the second potential, or may be nonlinearly reduced from the first potential to the second potential, that is, after the negative electrode potential of the lithium battery is increased, a change rate of the negative electrode potential of the lithium battery may be kept unchanged, or may be changed, for example, the change rate of the negative electrode potential of the lithium battery may be gradually reduced or gradually increased, which is not specifically limited in this embodiment of the present application.
Similarly to the above, in the embodiment of the present application, the first potential and the second potential may be potential values preset in a local area of the electronic device, may also be potential values obtained by the electronic device according to a battery state of the lithium battery, and may also be a negative potential of the lithium battery after the negative potential is increased in a historical charging operation process obtained by the electronic device.
The technical process of the electronic device correspondingly obtaining the first potential and the second potential according to the battery state of the lithium battery is the same as the technical process of the electronic device correspondingly obtaining the first negative electrode potential according to the battery state of the lithium battery, and the embodiment of the application is not repeated herein. Similarly to the above, the manner of acquiring the first potential and the second potential according to the battery state of the lithium battery can fully consider various conditions of aging of the lithium battery, and the like, so that the acquired first potential and second potential are more accurate.
Referring to fig. 2 and 3, fig. 2 shows a schematic diagram of the change of the negative potential of the lithium battery during the charging operation performed cyclically under the condition that the negative potential (V1) of the lithium battery is kept constant, the negative potential of the lithium battery is increased and the negative potential (V2) of the lithium battery is controlled to be kept constant during the first stage of charging, and fig. 3 shows a schematic diagram of the change of the negative potential of the lithium battery during the charging operation performed cyclically under the condition that the negative potential (V1) of the lithium battery is gradually increased, the negative potential of the lithium battery is increased and the negative potential (V2) of the lithium battery is controlled to be gradually decreased during the first stage of charging.
In an alternative embodiment of the present application, the raising of the negative electrode potential of the lithium battery may include one of: and utilizing a second charging current to charge the lithium battery in a second stage, perform standing treatment on the lithium battery or discharge the lithium battery, wherein the second charging current is smaller than the first charging current.
Wherein, carrying out the second stage to the lithium cell and charging, can increase the charge operation in-process and prolong to the charging of lithium cell, further improve the charge efficiency of lithium cell. Discharging the lithium battery, and accelerating the speed of converting the lithium simple substance separated out in the first charging stage of the lithium battery into the negative electrode of the lithium ion embedded lithium battery, thereby reducing the execution time of the rising treatment of the negative electrode potential of the lithium battery, and then increasing the time occupation ratio of the first-stage charging in the charging operation process, and further ensuring the charging efficiency of the lithium battery. In addition, because the charging current that first stage was charged is great, consequently, the first stage is charged and can lead to the temperature of lithium cell to show and rise, stews the processing to the lithium cell, reduces the temperature of lithium cell, avoids the lithium cell to age with higher speed, promotes the security in the charging process.
Optionally, the second charging current may be less than or equal to the lithium deposition critical current, and since the second charging current is less than or equal to the lithium deposition critical current value, it may be ensured that the negative electrode potential of the lithium battery is greater than or equal to the lithium deposition critical potential in the second stage charging process.
In an alternative embodiment of the present application, the electronic device may determine the second charging current according to a preset second negative electrode potential, wherein the second negative electrode potential may be greater than or equal to the lithium deposition critical potential.
In this embodiment of the application, the second negative electrode potential may be a potential value preset locally in the electronic device, or may be a potential value obtained by the electronic device according to a battery state of the lithium battery, or may be a negative electrode potential value of the lithium battery charged at the second stage in a historical charging operation process, where the negative electrode potential value is obtained by the electronic device.
The technical process that the electronic device correspondingly acquires the second negative electrode potential according to the battery state of the lithium battery is the same as the technical process that the electronic device correspondingly acquires the first negative electrode potential according to the battery state of the lithium battery, and the embodiment of the application is not repeated herein. The method for acquiring the second negative electrode potential according to the battery state of the lithium battery can fully consider various conditions of aging of the lithium battery and the like, so that the acquired second negative electrode potential is more accurate.
In addition, if the first negative electrode potential corresponding to each charging operation is different during the charging operation executed in a cyclic manner, correspondingly, the second negative electrode potential corresponding to each charging operation in a plurality of charging operations executed in a cyclic manner may be different, wherein the second negative electrode potential corresponding to each charging operation in the plurality of charging operations executed in a cyclic manner is inversely related to the execution order of each charging operation in the cyclic manner.
In other words, the charging operation performed later in the cycle may be controlled such that the second negative electrode potential is smaller (i.e., closer to the lithium deposition critical potential), for example, the second negative electrode potential corresponding to the 100 th performed charging operation is smaller than the second negative electrode potential corresponding to the 99 th performed charging operation.
In a possible implementation manner, the second charging current is kept unchanged during the second-stage charging process, and correspondingly, the negative electrode potential of the lithium battery is also kept unchanged during the second-stage charging process.
The second charging current is kept unchanged in the second stage charging process, so that the control complexity of the second stage charging can be reduced, and the calculation amount of the electronic equipment in the second stage charging process is reduced.
In another possible implementation manner, during the second-stage charging process, the second charging current is increased, wherein the second charging current may be increased from a third current value to a fourth current value during the second-stage charging process, and correspondingly, the potential of the negative electrode of the lithium battery may be decreased from the first potential to the second potential during the second-stage charging process.
Optionally, in this embodiment of the application, the second charging current may be linearly increased from the third current value to the fourth current value, or may be nonlinearly increased from the third current value to the fourth current value, that is, in the second-stage charging process, a change rate of the second charging current may be kept unchanged, or may be changed, for example, the change rate of the second charging current may be gradually decreased or gradually increased, which is not specifically limited in this embodiment of the application.
Correspondingly, in the second-stage charging process, the negative electrode potential of the lithium battery may be linearly reduced from the first potential to the second potential, or may be nonlinearly reduced from the first potential to the second potential, that is, in the second-stage charging process, the change rate of the negative electrode potential of the lithium battery may be kept unchanged, or may be changed, for example, the change rate of the negative electrode potential of the lithium battery may be gradually reduced or gradually increased, which is not specifically limited in this embodiment of the present application.
Referring to fig. 4, which shows an exemplary flowchart for determining the first charging current according to an embodiment of the present application, as shown in fig. 4, the technical process includes the following steps:
Wherein, the magnitude of the first initial charging current can be preset in the electronic device.
Optionally, the electronic device may detect the negative electrode potential of the lithium battery in various ways, and in the following, the embodiment of the present application provides three ways of detecting the negative electrode potential of the lithium battery exemplarily:
in the first type, a reference electrode may be disposed inside the lithium battery, for example, the reference electrode may be a lithium-plated copper wire, and the electronic device may detect a voltage between a negative electrode of the lithium battery and the reference electrode, and use the detected voltage as a negative electrode potential of the lithium battery.
Secondly, the electronic device may calculate an increase amount of the battery capacity of the lithium battery by using the charging current and the charging duration in a period of time, and measure the increase amount of the battery voltage of the lithium battery in the period of time, and the electronic device may calculate the negative electrode potential of the lithium battery based on the increase amount of the battery capacity and the increase amount of the battery voltage.
And thirdly, the electronic equipment can obtain a pre-established battery model of the lithium battery, measure the battery voltage, the temperature and the charging current of the lithium battery, and substitute the measured battery voltage, the measured temperature and the measured charging current of the lithium battery into the battery model, so that the potential of the negative electrode of the lithium battery is calculated.
In step 403, the electronic device adjusts the first initial charging current according to the difference between the first negative electrode potential and the detected negative electrode potential of the lithium battery, so as to obtain a first charging current.
In this embodiment, the electronic device may detect the negative electrode potential of the lithium battery in real time or periodically during the charging process, determine a difference between the first negative electrode potential and the detected negative electrode potential of the lithium battery after detecting the negative electrode potential of the lithium battery, and then adjust the first initial charging current according to the difference until the detected negative electrode potential of the lithium battery is consistent with the first negative electrode potential, at which time, the first charging current may be obtained.
Referring to fig. 5, a flowchart of an exemplary technical process for performing a first-stage charging on a lithium battery according to an embodiment of the present application is shown, and as shown in fig. 5, the technical process includes the following steps:
In an optional embodiment of the present application, a corresponding relationship between the charging duration and the negative electrode potential may be preset in the electronic device, and the electronic device may query the corresponding relationship according to the negative electrode potential corresponding to the first-stage charging, and obtain the first charging duration according to a query result.
In addition, the preset first charging time period may be determined according to the first negative electrode potential and a preset lithium analysis condition, where the preset lithium analysis condition includes that lithium simple substances separated out from the lithium battery can be completely converted into lithium ions after the lithium battery discharges according to a preset discharge rate, and the lithium ions are returned to the positive electrode of the lithium battery.
It is noted that the preset discharge rate may be the maximum discharge rate of the lithium battery.
In an optional embodiment of the present application, the manner for determining whether all lithium simple substances are converted into lithium ions may include: disassembling the lithium battery in an inert atmosphere, and observing whether the surface of the negative electrode has stripes or lithium metal or not through a scanning electron microscope.
Referring to fig. 6, a flowchart of an exemplary technical process of performing second-stage charging on a lithium battery according to an embodiment of the present application is shown, and as shown in fig. 6, the technical process includes the following steps:
Wherein, the magnitude of the second initial charging current can be preset in the electronic device.
The technical process of detecting the negative electrode potential of the lithium battery by the electronic device is the same as that described above, and the embodiment of the application is not described herein again.
Similarly to the above, in the embodiment of the present application, the electronic device may detect the negative electrode potential of the lithium battery in real time or periodically during the charging process, determine the difference between the second negative electrode potential and the detected negative electrode potential of the lithium battery after detecting the negative electrode potential of the lithium battery, and then adjust the second initial charging current according to the difference until the detected negative electrode potential of the lithium battery is equal to the second negative electrode potential, at which time, the second charging current may be obtained.
Referring to fig. 7, it shows a flowchart of an exemplary technical process for performing the second-stage charging on the lithium battery according to an embodiment of the present application, and as shown in fig. 7, the technical process includes the following steps:
In an optional embodiment of the present application, a corresponding relationship between the charging duration and the negative electrode potential may be preset in the electronic device, and the electronic device may query the corresponding relationship according to the negative electrode potential corresponding to the second stage charging, and obtain the second charging duration according to a query result.
The second charging time period is determined according to the second negative electrode potential, the first charging time period of the first stage charging and a preset lithium simple substance elimination condition, wherein the preset lithium simple substance elimination condition comprises that all lithium simple substances separated out in the first stage charging are converted into lithium ions to be embedded into the negative electrode of the lithium battery.
As described above, the manner of determining whether all of the elemental lithium is converted into lithium ions may include: the lithium battery is disassembled in an inert atmosphere, and then whether the surface of the negative electrode has speckles or lithium metal or not is observed through a scanning electron microscope.
It should be noted that, in order to ensure that all the lithium simple substances precipitated by the first-stage charging are converted into the negative electrode of the lithium ion-embedded lithium battery, a value obtained by performing an integration operation on the negative electrode potential corresponding to the second-stage charging based on the second charging time period needs to be larger than a value obtained by performing an integration operation on the negative electrode potential corresponding to the first-stage charging based on the first charging time period.
And step 702, the electronic equipment performs second-stage charging on the lithium battery according to the second charging time period.
Referring to fig. 8, it shows a flowchart of a technical process of an exemplary charging operation provided in this embodiment, as shown in fig. 8, the charging operation includes the following steps:
Wherein the first negative electrode potential, which positively correlates with an execution order of the currently executed charging operation during the cycle, may be equal to or less than a lithium deposition critical potential. The first charging current may be equal to or greater than a lithium-evolution critical current, the first charging current being inversely related to an execution order of the currently executed charging operation during the cycle.
The first charging time is determined according to the first negative electrode potential and a preset lithium analysis condition, wherein the preset lithium analysis condition comprises that lithium simple substances separated out from the lithium battery can be completely converted into lithium ions after the lithium battery discharges according to a preset discharge rate and then the lithium ions are returned to the positive electrode of the lithium battery.
Wherein the first charging current remains unchanged during the first stage charging; alternatively, the first charging current is reduced from the first current value to the second current value during the first stage charging.
And 806, the electronic device charges the lithium battery based on the second initial charging current.
In step 807, in the charging process, the electronic device detects the negative electrode potential of the lithium battery.
Wherein the second negative electrode potential, which is inversely related to the execution order of the currently executed charging operation during the cycle, may be equal to or greater than the lithium deposition critical potential. The second charging current may be equal to or less than a lithium deposition critical current, the second charging current being positively correlated with an execution order of the currently executed charging operation during the cycle.
The second charging time is determined according to the second negative electrode potential, the first charging time and a preset lithium simple substance elimination condition, wherein the preset lithium simple substance elimination condition comprises that all lithium simple substances separated out in the first-stage charging are converted into lithium ions to be embedded into the negative electrode of the lithium battery.
Step 810, the electronic device charges the lithium battery for a second charging time period based on the second charging current to complete the second stage charging, and then the electronic device returns to execute step 801 until the charge cut-off condition is met.
The second charging current is kept unchanged in the second stage charging process; or the second charging current is increased from the third current value to the fourth current value in the second-stage charging process.
Referring to fig. 9, a block diagram of a charging apparatus 900 provided in an embodiment of the present disclosure is shown, where the charging apparatus 900 may be configured in the electronic device described above. As shown in fig. 9, the charging device 900 may include: a charging module 901.
The charging module 901 is configured to perform multiple charging operations on a lithium battery in a circulating manner until a charge ending condition is met.
The charging module 901 includes:
and the charging unit 9011 is configured to perform first-stage charging on the lithium battery by using the first charging current.
And a processing unit 9012, configured to raise the negative electrode potential of the lithium battery after the first-stage charging is finished.
In an optional embodiment of the present application, during the first stage charging, the first charging current is kept constant; alternatively, the first charging current is reduced during the first stage charging.
In an optional embodiment of the present application, the charging unit 9011 is specifically configured to: charging the lithium battery based on a first initial charging current; detecting the negative electrode potential of the lithium battery in the charging process; and adjusting the first initial charging current according to the difference between the preset first negative electrode potential and the detected negative electrode potential of the lithium battery to obtain the first charging current. .
In an optional embodiment of the present application, in the plurality of charging operations performed in a cycle, the first negative electrode potential corresponding to each charging operation is different.
In an optional embodiment of the present application, the charging unit 9011 is specifically configured to: and performing the first-stage charging on the lithium battery by using the first charging current according to a preset first charging time, wherein the first charging time is determined according to the first cathode potential and a preset lithium-separating condition.
In an optional embodiment of the present application, the processing unit 9012 is specifically configured to: raising the negative electrode potential of the lithium battery, and controlling the negative electrode potential of the lithium battery to be kept unchanged; or, the negative electrode potential of the lithium battery is increased and is controlled to be reduced from the first potential to the second potential
In an optional embodiment of the present application, the processing unit 9012 is specifically configured to: performing second-stage charging on the lithium battery by using second charging current, wherein the second charging current is smaller than the first charging current; or, the lithium battery is subjected to standing treatment; or, discharging the lithium battery
In an alternative embodiment of the present application, the second charging current is kept constant during the second stage charging; alternatively, the first and second liquid crystal display panels may be,
and increasing the second charging current in the second-stage charging process.
In an optional embodiment of the present application, the processing unit 9012 is specifically configured to: charging the lithium battery based on the second initial charging current; detecting the negative electrode potential of the lithium battery in the charging process; and adjusting the second initial charging current according to the difference between the preset second negative electrode potential and the detected negative electrode potential of the lithium battery to obtain the second charging current.
In an alternative embodiment of the present application, in the plurality of charging operations executed in a cycle, the second negative electrode potential corresponding to each charging operation is different.
In an optional embodiment of the present application, the processing unit 9012 is specifically configured to: and performing the first-stage charging on the lithium battery by using the second charging current according to a preset second charging time, wherein the second charging time is determined according to the second negative electrode potential, the negative electrode potential of the lithium battery in the first-stage charging, the first charging time of the first-stage charging and a preset lithium simple substance elimination condition.
In an alternative embodiment of the present application, the charge cutoff condition includes: the battery voltage reaches the charge cutoff voltage of the constant current charging stage.
The charging device provided by the embodiment of the application can realize the method embodiment, the realization principle and the technical effect are similar, and the details are not repeated.
For specific limitations of the charging device, reference may be made to the above limitations of the charging method, which are not described herein again. The modules in the charging apparatus may be implemented in whole or in part by software, hardware, and a combination thereof. The modules may be embedded in a hardware form or may be independent of a processor in the electronic device, or may be stored in a memory in the electronic device in a software form, so that the processor calls and executes operations corresponding to the modules.
Fig. 10 is a schematic diagram of an internal structure of an electronic device in one embodiment. As shown in fig. 10, the electronic device includes a processor and a memory connected by a system bus. Wherein, the processor is used for providing calculation and control capability and supporting the operation of the whole electronic equipment. The memory may include a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The computer program can be executed by a processor to implement a charging method provided in the above embodiments. The internal memory provides a cached execution environment for the operating system and computer programs in the non-volatile storage medium.
It will be understood by those skilled in the art that the structure shown in fig. 10 is a block diagram of only a portion of the structure associated with the present application, and does not constitute a limitation on the electronic device to which the present application applies, and that a particular electronic device may include more or fewer components than shown in the drawings, or may combine certain components, or have a different arrangement of components.
In one embodiment of the present application, an electronic device is provided, which includes a memory and a processor, the memory storing a computer program, and the processor implementing the following steps when executing the computer program:
circularly executing multiple charging operations on the lithium battery until a charging cut-off condition is met;
wherein the charging operation includes:
and carrying out first-stage charging on the lithium battery by using a first charging current, and increasing the negative electrode potential of the lithium battery after the first-stage charging is finished.
In one embodiment of the present application, the first charging current is maintained constant during the first stage charging; alternatively, the first charging current is reduced during the first stage charging.
In one embodiment of the application, the processor when executing the computer program further performs the steps of: charging the lithium battery based on a first initial charging current; detecting the negative electrode potential of the lithium battery in the charging process; and adjusting the first initial charging current according to the difference between the preset first negative electrode potential and the detected negative electrode potential of the lithium battery to obtain the first charging current.
In one embodiment of the present application, in the plurality of charging operations performed cyclically, the first negative electrode potential corresponding to each charging operation is different.
In one embodiment of the application, the processor when executing the computer program further performs the steps of: and performing the first-stage charging on the lithium battery by using the first charging current according to a preset first charging time period, wherein the first charging time period is determined according to the first negative electrode potential and a preset lithium separating condition.
In one embodiment of the application, the processor when executing the computer program further performs the steps of: raising the negative electrode potential of the lithium battery, and controlling the negative electrode potential of the lithium battery to be kept unchanged; or, the negative electrode potential of the lithium battery is increased, and the negative electrode potential of the lithium battery is controlled to be reduced from the first potential to the second potential.
In one embodiment of the application, the processor when executing the computer program further performs the steps of: performing second-stage charging on the lithium battery by using second charging current, wherein the second charging current is smaller than the first charging current; or, standing the lithium battery; alternatively, the lithium battery is discharged.
In one embodiment of the present application, the second charging current is kept constant during the second stage charging; alternatively, the second charging current is increased during the second stage charging.
In one embodiment of the application, the processor when executing the computer program further performs the steps of: charging the lithium battery based on a second initial charging current; detecting the negative electrode potential of the lithium battery in the charging process; and adjusting the second initial charging current according to the difference between the preset second negative electrode potential and the detected negative electrode potential of the lithium battery to obtain the second charging current.
In one embodiment of the present application, in the plurality of charging operations executed cyclically, the second negative electrode potential corresponding to each charging operation is different.
In one embodiment of the application, the processor when executing the computer program further performs the steps of: and performing the first-stage charging on the lithium battery by using the second charging current according to a preset second charging time, wherein the second charging time is determined according to the second negative electrode potential, the negative electrode potential of the lithium battery in the first-stage charging, the first charging time of the first-stage charging and a preset lithium simple substance elimination condition.
In one embodiment of the present application, the charge cutoff condition includes: the battery voltage reaches the charge cutoff voltage of the constant current charging stage.
The electronic device provided by the embodiment of the application has the implementation principle and the technical effect similar to those of the method embodiment, and is not described herein again.
In an embodiment of the application, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the steps of:
circularly executing a plurality of charging operations on the lithium battery until a charging cut-off condition is met;
wherein the charging operation includes:
and carrying out first-stage charging on the lithium battery by using a first charging current, and increasing the negative electrode potential of the lithium battery after the first-stage charging is finished.
In one embodiment of the present application, the first charging current is kept constant during the first stage charging; or, in the first-stage charging process, the first charging current is reduced.
In one embodiment of the application, the computer program when executed by the processor further performs the steps of: charging the lithium battery based on a first initial charging current; detecting the negative electrode potential of the lithium battery during the charging process; and adjusting the first initial charging current according to the difference between the preset first negative electrode potential and the detected negative electrode potential of the lithium battery to obtain the first charging current.
In an embodiment of the application, in the plurality of charging operations executed in a cycle, the first negative electrode potential corresponding to each charging operation is different.
In one embodiment of the application, the computer program when executed by the processor further performs the steps of: and performing the first-stage charging on the lithium battery by using the first charging current according to a preset first charging time, wherein the first charging time is determined according to the first cathode potential and a preset lithium-separating condition.
In one embodiment of the application, the computer program when executed by the processor further performs the steps of: raising the negative electrode potential of the lithium battery, and controlling the negative electrode potential of the lithium battery to be kept unchanged; or, the negative electrode potential of the lithium battery is increased, and the negative electrode potential of the lithium battery is controlled to be reduced from the first potential to the second potential.
In one embodiment of the application, the computer program when executed by the processor further performs the steps of: performing second-stage charging on the lithium battery by using second charging current, wherein the second charging current is smaller than the first charging current; or, the lithium battery is subjected to standing treatment; alternatively, the lithium battery is discharged.
In one embodiment of the present application, the second charging current is kept constant during the second stage charging; or, in the second stage charging process, the second charging current is increased.
In one embodiment of the application, the computer program when executed by the processor further performs the steps of: charging the lithium battery based on a second initial charging current; detecting the negative electrode potential of the lithium battery during the charging process; and adjusting the second initial charging current according to the difference between the preset second negative electrode potential and the detected negative electrode potential of the lithium battery to obtain the second charging current.
In an embodiment of the application, in the plurality of charging operations executed in a cycle, the second negative electrode potential corresponding to each charging operation is different.
In one embodiment of the application, the computer program when executed by the processor further performs the steps of: and performing the first-stage charging on the lithium battery by using the second charging current according to a preset second charging time, wherein the second charging time is determined according to the second negative electrode potential, the negative electrode potential of the lithium battery in the first-stage charging, the first charging time of the first-stage charging and a preset lithium simple substance elimination condition.
In one embodiment of the present application, the charge cutoff condition includes: the battery voltage reaches the charge cutoff voltage of the constant current charging stage.
The implementation principle and technical effect of the computer-readable storage medium provided by this embodiment are similar to those of the above-described method embodiment, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium used in the embodiments provided herein may include non-volatile and/or volatile memory, among others. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in M forms, such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (SyMchlimk) DRAM (SLDRAM), raMbus (RaMbus) direct RAM (RDRAM), direct RaMbus Dynamic RAM (DRDRAM), and RaMbus Dynamic RAM (RDRAM), among others.
All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure 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 claims. 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, and these are all 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 (15)
1. A method of charging, the method comprising:
circularly executing multiple charging operations on the lithium battery until a charging cut-off condition is met;
wherein the charging operation comprises:
and carrying out first-stage charging on the lithium battery by using a first charging current, and after the first-stage charging is finished, increasing the negative electrode potential of the lithium battery.
2. The method of claim 1, wherein during the first stage charging, the first charging current is held constant; alternatively, the first and second electrodes may be,
and in the first-stage charging process, reducing the first charging current.
3. The method according to claim 1 or 2, characterized in that the method further comprises:
charging the lithium battery based on a first initial charging current;
detecting the potential of a negative electrode of the lithium battery in the charging process;
and adjusting the first initial charging current according to the difference between a preset first negative electrode potential and the detected negative electrode potential of the lithium battery to obtain the first charging current.
4. The method according to claim 3, wherein the first negative electrode potential is different for each of a plurality of charging operations performed in a cycle.
5. The method of claim 3, wherein the first charging the lithium battery with a first charging current comprises:
and carrying out the first-stage charging on the lithium battery by using the first charging current according to a preset first charging time length, wherein the first charging time length is determined according to the first negative electrode potential and a preset lithium analysis condition.
6. The method of claim 1, wherein the increasing the negative electrode potential of the lithium battery comprises:
raising the negative electrode potential of the lithium battery, and controlling the negative electrode potential of the lithium battery to be kept unchanged; alternatively, the first and second electrodes may be,
and raising the negative electrode potential of the lithium battery, and controlling the negative electrode potential of the lithium battery to be reduced from a first potential to a second potential.
7. The method according to claim 1 or 6, wherein the step of increasing the negative electrode potential of the lithium battery comprises at least one of:
performing second-stage charging on the lithium battery by using second charging current, wherein the second charging current is smaller than the first charging current;
standing the lithium battery;
and discharging the lithium battery.
8. The method of claim 7, wherein during the second stage charging, the second charging current is held constant; alternatively, the first and second liquid crystal display panels may be,
and in the second-stage charging process, increasing the second charging current.
9. The method of claim 7, further comprising:
charging the lithium battery based on a second initial charging current;
detecting the potential of a negative electrode of the lithium battery in the charging process;
and adjusting the second initial charging current according to the difference between the preset second negative electrode potential and the detected negative electrode potential of the lithium battery to obtain the second charging current.
10. The method according to claim 9, wherein the second negative electrode potential is different for each of the plurality of charging operations performed in a cycle.
11. The method of claim 7, wherein the second stage charging the lithium battery with a second charging current comprises:
and carrying out the first-stage charging on the lithium battery by utilizing the second charging current according to a preset second charging time, wherein the second charging time is determined according to the second negative electrode potential, the negative electrode potential of the lithium battery in the first-stage charging, the first charging time of the first-stage charging and a preset lithium simple substance elimination condition.
12. The method of claim 1, wherein the charge cutoff condition comprises:
the battery voltage reaches the charge cutoff voltage of the constant current charging stage.
13. A charging device, the device comprising:
the charging module is used for circularly executing multiple charging operations on the lithium battery until a charging cut-off condition is met;
wherein the charging module includes:
the charging unit is used for carrying out first-stage charging on the lithium battery by utilizing first charging current;
and the processing unit is used for increasing the negative electrode potential of the lithium battery after the first-stage charging is finished.
14. An electronic device, comprising a memory and a processor, the memory storing a computer program which, when executed by the processor, implements the charging method according to any one of claims 1 to 12.
15. A computer-readable storage medium, characterized in that a computer program is stored thereon which, when being executed by a processor, carries out a charging method according to any one of claims 1 to 12.
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| CN202110834261.3A CN115693809A (en) | 2021-07-21 | 2021-07-21 | Charging method, device, equipment and storage medium |
| PCT/CN2022/106322 WO2023001117A1 (en) | 2021-07-21 | 2022-07-18 | Charging method and apparatus, and device and storage medium |
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| CN106450536B (en) * | 2016-11-09 | 2018-12-11 | 清华大学 | Quick charging method for lithium ion battery |
| CN112803510B (en) * | 2019-11-13 | 2023-10-24 | Oppo广东移动通信有限公司 | Charging control method and device, electronic equipment and computer storage medium |
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