CN112104031A - Lithium battery charging method and charging device - Google Patents
Lithium battery charging method and charging device Download PDFInfo
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- CN112104031A CN112104031A CN202010953824.6A CN202010953824A CN112104031A CN 112104031 A CN112104031 A CN 112104031A CN 202010953824 A CN202010953824 A CN 202010953824A CN 112104031 A CN112104031 A CN 112104031A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/0071—Regulation of charging or discharging current or voltage with a programmable schedule
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/00714—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery charging or discharging current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- 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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- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
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Abstract
The embodiment of the invention discloses a lithium battery charging method and a charging device. The lithium battery charging method comprises the following steps: constant-current charging is carried out on a lithium battery by using a first charging current until the lithium battery reaches a first preset voltage; stopping charging and keeping the preset time; constant-current charging is carried out on the lithium battery by using the second charging current until the lithium battery reaches a second preset voltage; and charging the lithium battery at a constant voltage by using a second preset voltage until the lithium battery is fully charged. According to the technical scheme of the embodiment of the invention, the polarization in the battery cell of the lithium battery can be effectively reduced, the voltage difference between the battery cells after the charging of the battery cells of the same type is reduced, the consistency of the voltage of the battery cells is favorably improved, the voltage range of the self-discharging of the battery cells is reduced, and the production efficiency is improved.
Description
Technical Field
The embodiment of the invention relates to a charging technology, in particular to a lithium battery charging method and a charging device.
Background
The lithium battery has the advantages of high single output voltage, long cycle life, large specific energy, small volume, low self-discharge, no memory effect, no pollution, wide working temperature range and the like, and is widely applied to various fields of electronic instruments, digital products, household electrical appliances, electric vehicles and the like.
In the prior art, a constant-current-constant-voltage charging mode is generally adopted in a battery core charging process of a lithium battery, when the battery core is subjected to constant-current charging to a certain fixed voltage, the voltage at the moment is not the real voltage of the battery, if voltage limitation is not carried out, the voltage of the battery core can continuously rise to cause internal polarization and even destroy the battery structure, and if the fixed voltage is just reached, the battery core is not fully charged. In order to further fully charge the battery without damaging the cell, the charging is continued in a constant voltage mode. Along with the increase of the charging amount, the actual voltage of the battery cell is closer to the set voltage, and at this time, in order to maintain the voltage constant, the current value is gradually reduced until the charging is cut off when the set minimum current is reached, that is, the battery cell is considered to be fully charged at this time. If the off current is not set for the constant voltage charging, it is theoretically possible to stop the charging when the current is as small as 0mA, but the time required for this is considerably long, and in view of the problem of charging efficiency, the conventional charging standard stipulates that the constant voltage charging is stopped when the current is reduced to 0.05C.
Because the current is 0.05C when the constant voltage charging is stopped, the polarization of the battery cell can cause the voltage of the battery cell to still have a larger reduction space, the consistency of the voltage of the battery cell is poorer, and the yield of the battery cell during capacity grading is lower.
Disclosure of Invention
The embodiment of the invention provides a lithium battery charging method and a charging device, and the charging method can improve the consistency of the cell voltage during capacity grading of a lithium battery, weaken the polarization phenomenon of a cell and improve the production efficiency.
In a first aspect, an embodiment of the present invention provides a lithium battery charging method, including:
constant-current charging is carried out on a lithium battery by using a first charging current until the lithium battery reaches a first preset voltage;
stopping charging and keeping the preset time;
constant-current charging is carried out on the lithium battery by using a second charging current until the lithium battery reaches a second preset voltage;
and charging the lithium battery at constant voltage to full charge by using the second preset voltage.
Optionally, before the first charging current is used for constant current charging of the lithium battery until the lithium battery reaches a first preset voltage, the method further includes:
obtaining the type of the lithium battery, and determining values of a first preset voltage and a second preset voltage according to the type of the lithium battery;
wherein the first preset voltage is greater than the second preset voltage.
Optionally, the first charging current is 0.3C to 0.5C, and the second charging current is 0.3C to 0.5C.
Optionally, the preset time is 2-5 minutes.
Optionally, the step of charging the lithium battery to full charge at constant voltage with the second preset voltage comprises:
acquiring a third charging current in constant-voltage charging in real time;
and when the third charging current is 0.001-0.03C, judging that the lithium battery is fully charged.
In a second aspect, an embodiment of the present invention further provides a lithium battery charging apparatus, including:
the first charging module is used for charging the lithium battery at a constant current by using a first charging current until the lithium battery reaches a first preset voltage;
the timing module is used for recording the preset time for stopping charging and keeping of the first charging module;
the second charging module is used for charging the lithium battery at a constant current by using a second charging current until the lithium battery reaches a second preset voltage;
and the third charging module is used for charging the lithium battery to full charge at constant voltage by using the second preset voltage.
Optionally, the method further includes:
the voltage determining module is connected with the first charging module and the second charging module and used for acquiring the type of the lithium battery and determining values of a first preset voltage and a second preset voltage according to the type of the lithium battery;
wherein the first preset voltage is greater than the second preset voltage.
Optionally, the first charging current is 0.3C to 0.5C, and the second charging current is 0.3C to 0.5C.
Optionally, the preset time is 2-5 minutes.
Optionally, the third charging module is further configured to:
acquiring a third charging current in constant-voltage charging in real time;
and when the third charging current is 0.001-0.03C, judging that the lithium battery is fully charged.
According to the lithium battery charging method provided by the embodiment of the invention, the lithium battery is charged at constant current by using the first charging current until the lithium battery reaches the first preset voltage, and the first preset voltage can be measured according to a preliminary experiment; then stopping charging and keeping the preset time to ensure that the voltage of the lithium battery is reduced to be stable; then, constant-current charging is carried out on the lithium battery by using a second charging current until the lithium battery reaches a second preset voltage, and the second preset voltage is the voltage obtained by the expected lithium battery; and finally, the lithium battery is charged at a constant voltage by using a second preset voltage until the electric quantity is full. Through the charging method of twice constant-current charging and once constant-voltage charging, the polarization in the lithium battery cell can be effectively reduced, the voltage difference between the cells after the charging of the cells of the same type is finished is reduced, the consistency of the cell voltage is favorably improved, the voltage range of the self-discharging of the cell is reduced, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a cross-flow-constant voltage charging curve for a lithium battery of the prior art;
fig. 2 is a schematic flow chart of a lithium battery charging method according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of another lithium battery charging method according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a lithium battery charging device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another lithium battery charging apparatus according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
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. It should be noted that the terms "upper", "lower", "left", "right", and the like used in the description of the embodiments of the present invention are used in the angle shown in the drawings, and should not be construed as limiting the embodiments of the present invention. In addition, in this context, it is also to be understood that when an element is referred to as being "on" or "under" another element, it can be directly formed on "or" under "the other element or be indirectly formed on" or "under" the other element through an intermediate element. The terms "first," "second," and the like, are used for descriptive purposes only and not for purposes of limitation, and do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Fig. 1 is a schematic diagram illustrating a cross-flow-constant voltage charging curve of a lithium battery in the prior art, referring to fig. 1, before starting charging, a battery voltage is first detected, and if the battery voltage is lower than a threshold voltage (about 2.5V), the battery is precharged with a small current of 0.1C, so that the battery voltage slowly rises; when the voltage of the battery reaches the threshold voltage, the constant-current charging is carried out, the battery is rapidly charged at the stage with higher current (0.5C-1C) intensity, the voltage of the battery rises faster, and the capacity of the battery reaches about 85% of the rated value of the battery; after the battery voltage rises to the upper limit voltage (4.2V), the circuit is switched to a constant voltage charging mode, the battery voltage is basically maintained at 4.2V, the charging current is gradually reduced, the charging speed is slowed, the stage mainly ensures that the battery is fully charged, and when the charging current drops to 0.05C, the battery is judged to be fully charged. Wherein C represents the charge and discharge multiplying power of the battery, and the charge and discharge multiplying power is charge and discharge current/rated capacity; for example: when 20A for a battery having a rated capacity of 100 A.h was discharged, the discharge rate was 0.2C.
Because the current is 0.05C when the constant voltage charging stops in the existing constant current-constant voltage charging mode, the cell voltage still has a space for reduction, the cell voltage grades charged by the constant current-constant voltage in the industry at present are generally two, the grade range difference is about 10mV, and the range is larger; and the time from the capacity grading of the battery cell to the first test voltage is 24-48 hours, then the polarization of the battery cell is basically stable, the polarization phenomenon of the battery cell is serious due to the existing charging mode, the voltage consistency among different battery cells is poor, and the production efficiency needs to be improved.
To solve the above problem, fig. 2 is a schematic flow chart of a lithium battery charging method according to an embodiment of the present invention, which is applicable to a first charging condition of a battery before a high-temperature aging test, and the method can be executed by a lithium battery charging apparatus, where the charging method includes:
step S110, the lithium battery is subjected to constant current charging by using the first charging current until the lithium battery reaches a first preset voltage.
The first preset voltage may be determined through an early-stage test experiment performed on the lithium battery, and is generally set to be slightly higher than a voltage that the lithium battery is expected to reach, for example, the voltage that the lithium battery is expected to reach is 3.75V, the first preset voltage may be 3.80V, and the first preset voltage may be set according to an actual situation in a specific implementation, which is not limited in the embodiment of the present invention. Optionally, the first charging current may be 0.3C to 0.5C, and may be flexibly selected according to an actual situation in specific implementation.
And step S120, stopping charging and keeping the preset time.
It is understood that at the moment of stopping charging, the voltage will instantaneously drop to a certain value due to the polarization, and then slowly drop, and the voltage will not drop after keeping stable for a preset time. In specific implementation, the preset time can be 2-5 minutes optionally.
And step S130, performing constant current charging on the lithium battery by using the second charging current until the lithium battery reaches a second preset voltage.
The second preset voltage is a voltage expected by the lithium battery, and may be, for example, 3.75V, optionally, the second charging current may be 0.3C to 0.5C, for example, in a certain embodiment, the first charging current and the second charging current may be set to be the same, and may be flexibly selected according to actual situations in specific implementation.
Step S140, charging the lithium battery with a second preset voltage at a constant voltage until the lithium battery is fully charged.
Optionally, the constant voltage charging to full charge of the lithium battery with a second preset voltage comprises:
acquiring a third charging current in constant-voltage charging in real time;
and when the third charging current is 0.001-0.03C, judging that the lithium battery is fully charged.
In one embodiment, the initial value of the third charging current may be set to 0.05C, and the cutoff current may be set to 0.01C, and compared with the prior art, if the cutoff current is set to 0.01C by using a conventional constant current-constant voltage charging method, although the polarization of the battery cell may be reduced, the charging time may be prolonged, and the utilization rate of the charging device may be reduced.
The charging method provided by the embodiment can perform charging by using two constant current charging and one constant voltage charging modes without affecting the production efficiency, the cut-off current after charging is less than 0.05C in the prior art, the polarization in the battery cell can be reduced, the voltage consistency during the capacity grading of the battery is improved, and the voltage is ensured to be within a grade; the preset time is stopped between two times of constant current charging, so that the voltage of the battery cell is recharged after being reduced to be stable, the self-discharge value of the voltage after the battery cell is fully charged can be reduced, a bad battery can be better picked out, and the inspection accuracy is improved; the charging mode can also save the aging time of the battery and effectively reduce the production period, thereby reducing the operation cost and improving the production efficiency; according to the process, the voltage grade range of the battery cell is continuously reduced, so that the battery cell with a grade closer to that of the battery cell can be selected for matching and assembling the battery, the matching efficiency is improved, the influence of the voltage in matching is reduced, and the service life of the battery is prolonged; because the polarization inside the battery core is reduced, the time from the capacity grading of the battery to the first voltage testing can be shortened.
According to the technical scheme of the embodiment, the lithium battery is charged in a constant current mode by using the first charging current until the lithium battery reaches a first preset voltage, and the first preset voltage can be measured according to a preset experiment; then stopping charging and keeping the preset time to ensure that the voltage of the lithium battery is reduced to be stable; then, constant-current charging is carried out on the lithium battery by using a second charging current until the lithium battery reaches a second preset voltage, and the second preset voltage is the voltage obtained by the expected lithium battery; and finally, the lithium battery is charged at a constant voltage by using a second preset voltage until the electric quantity is full. Through the charging method of twice constant-current charging and once constant-voltage charging, the polarization in the lithium battery cell can be effectively reduced, the voltage difference between the cells after the charging of the cells of the same type is finished is reduced, the consistency of the cell voltage is favorably improved, the voltage range of the self-discharging of the cell is reduced, and the production efficiency is improved.
Fig. 3 is a schematic flow chart of another lithium battery charging method according to an embodiment of the present invention, and referring to fig. 3, optionally, the lithium battery charging method according to the embodiment includes:
step S210, obtaining the type of the lithium battery, and determining the values of the first preset voltage and the second preset voltage according to the type of the lithium battery.
The first preset voltage is greater than the second preset voltage. In specific implementation, the first preset voltage may be determined through an early-stage test experiment performed on the lithium battery, and is generally set to be slightly higher than a voltage that the lithium battery is expected to reach, for example, the voltage that the lithium battery is expected to reach is 3.75V, the first preset voltage may be 3.80V, the second preset voltage may be 3.75V, and the first preset voltage may be set according to an actual situation in specific implementation, which is not limited in the embodiment of the present invention.
Step S220, the lithium battery is subjected to constant current charging by using the first charging current until the lithium battery reaches a first preset voltage.
Optionally, the first charging current may be 0.3C to 0.5C, and may be flexibly selected according to an actual situation in specific implementation.
And step S230, stopping charging and keeping the preset time.
Optionally, the preset time may be 2-5 minutes.
And step S240, charging the lithium battery with the second charging current in a constant current mode until the lithium battery reaches a second preset voltage.
Optionally, the second charging current may be 0.3C to 0.5C, for example, in a certain embodiment, the first charging current and the second charging current may be set to be the same, and may be flexibly selected according to an actual situation in specific implementation.
And step S250, charging the lithium battery at a constant voltage by using a second preset voltage until the lithium battery is fully charged.
Optionally, the constant voltage charging to full charge of the lithium battery with a second preset voltage comprises:
acquiring a third charging current in constant-voltage charging in real time;
and when the third charging current is 0.001-0.03C, judging that the lithium battery is fully charged.
In the lithium battery charging method provided by this embodiment, the type of the lithium battery is obtained first, the first preset voltage and the second preset voltage are determined according to the type of the lithium battery, and then a charging method of twice constant-current charging and once constant-voltage charging is used, so that polarization inside the battery core of the lithium battery can be effectively reduced, voltage difference between the battery cores after charging of the battery cores of the same type is reduced, consistency of voltage of the battery cores is improved, a voltage range of self-discharge of the battery cores is narrowed, and production efficiency is improved.
For example, taking a nickel-cobalt-manganese (NCM) ternary lithium battery as an example, the grouping voltage is set to 3.730V-3.735V, the initial current of the constant voltage charging is 0.05C, and the cutoff current is 0.01C, table 1 shows the charging results of the charging method provided by the embodiment of the present invention, and table 2 shows the charging results of the conventional constant current-constant voltage charging, wherein the initial current of the constant voltage charging in table 2 is 0.33C, and the cutoff current is 0.05C.
Table 1 charging results of the charging method provided in this example
Table 2 charging results of the prior art constant current-constant voltage charging method
As can be seen from comparison between table 1 and table 2, the voltage drop of the battery charged by the charging method provided in the embodiment of the present invention is less than or equal to 5mV, while the voltage drop of the battery charged by the conventional constant current-constant voltage charging method is greater than 10mV, and even though a more complicated charging process is adopted, the charging time is not greatly increased as compared with the constant current-constant voltage charging method used in the prior art, which affects the charging efficiency, but reduces the charging time; therefore, compared with the prior art, the charging method provided by the embodiment of the invention has obvious advantages.
Fig. 4 is a schematic structural diagram of a lithium battery charging apparatus according to an embodiment of the present invention, where the lithium battery charging apparatus according to the embodiment may be used to perform any one of the lithium battery charging methods according to the foregoing embodiments, and referring to fig. 4, the lithium battery charging apparatus includes: the first charging module 10 is used for constant-current charging the lithium battery by using a first charging current until the lithium battery reaches a first preset voltage; the timing module 20 is configured to record a preset time for the first charging module 10 to stop charging and maintain; the second charging module 30 is used for charging the lithium battery with a second charging current in a constant current manner until the lithium battery reaches a second preset voltage; and a third charging module 40 for charging the lithium battery at a second preset voltage to full charge.
The first preset voltage may be determined through an early-stage test experiment performed on the lithium battery, and is generally set to be slightly higher than a voltage that the lithium battery is expected to reach, and the second preset voltage is a voltage that the lithium battery is expected to obtain, for example, the voltage that the lithium battery is expected to reach is 3.75V, the second preset voltage is 3.75V, and the first preset voltage may be 3.80V. Optionally, the first charging current may be 0.3C to 0.5C, and the second charging current may be 0.3C to 0.5C, for example, in a certain embodiment, the first charging current and the second charging current may be set to be the same, and may be flexibly selected according to an actual situation in specific implementation.
At the moment of stopping charging, due to the existence of polarization, the voltage can instantly drop to a certain value, then slowly drop, and the voltage is kept stable for a preset time and does not drop any more. In specific implementation, the preset time can be 2-5 minutes optionally.
Optionally, the third charging module 40 is further configured to:
acquiring a third charging current in constant-voltage charging in real time; and when the third charging current is 0.001-0.03C, judging that the lithium battery is fully charged.
In one embodiment, the initial value of the third charging current may be set to 0.05C, and the cutoff current may be set to 0.01C, and compared with the prior art, if the cutoff current is set to 0.01C by using a conventional constant current-constant voltage charging method, although the polarization of the battery cell may be reduced, the charging time may be prolonged, and the utilization rate of the charging device may be reduced.
The charging device provided by the embodiment can be used for charging by using two constant-current charging modes and one constant-voltage charging mode under the condition that the production efficiency is not influenced, the cut-off current after charging is less than 0.05C in the prior art, the polarization in the battery cell can be reduced, the voltage consistency during the capacity grading of the battery is improved, and the voltage is ensured to be within a grade; the preset time is stopped between two times of constant current charging, so that the voltage of the battery cell is recharged after being reduced to be stable, the self-discharge value of the voltage after the battery cell is fully charged can be reduced, a bad battery can be better picked out, and the inspection accuracy is improved; the charging mode can also save the aging time of the battery and effectively reduce the production period, thereby reducing the operation cost and improving the production efficiency; according to the process, the voltage grade range of the battery cell is continuously reduced, so that the battery cell with a grade closer to that of the battery cell can be selected for matching and assembling the battery, the matching efficiency is improved, the influence of the voltage in matching is reduced, and the service life of the battery is prolonged; because the polarization inside the battery core is reduced, the time from the capacity grading of the battery to the first voltage testing can be shortened.
According to the technical scheme of the embodiment, the first charging module is used for constant-current charging of the lithium battery by using a first charging current until the lithium battery reaches a first preset voltage, and the first preset voltage can be measured according to a preliminary experiment; then stopping charging and keeping the preset time, and timing by using a timing module to enable the voltage of the lithium battery to be reduced to be stable; then, a second charging module is used for charging the lithium battery at a constant current by using a second charging current until the lithium battery reaches a second preset voltage, wherein the second preset voltage is a voltage obtained by the expected lithium battery; and finally, the third charging module is used for charging the lithium battery at a constant voltage by using a second preset voltage until the lithium battery is full of electric quantity. Through the charging method of twice constant-current charging and once constant-voltage charging, the polarization in the lithium battery cell can be effectively reduced, the voltage difference between the cells after the charging of the cells of the same type is finished is reduced, the consistency of the cell voltage is favorably improved, the voltage range of the self-discharging of the cell is reduced, and the production efficiency is improved.
Fig. 5 is a schematic structural diagram of another lithium battery charging device according to an embodiment of the present invention, and referring to fig. 5, optionally, the lithium battery charging device according to the embodiment further includes: the voltage determining module 50 is connected with the first charging module 10 and the second charging module 30, and the voltage determining module 50 is used for acquiring the type of the lithium battery and determining values of a first preset voltage and a second preset voltage according to the type of the lithium battery; the first preset voltage is greater than the second preset voltage.
The lithium battery charging device provided by this embodiment obtains the type of the lithium battery through the voltage determining module, determines the first preset voltage and the second preset voltage according to the type of the lithium battery, and then uses the charging method of twice constant current charging and once constant voltage charging, so as to effectively reduce the polarization inside the electric core of the lithium battery, reduce the voltage difference between the electric cores after the electric cores of the same type are charged, facilitate to improve the consistency of the electric core voltage, reduce the voltage range of the electric core self-discharge, and improve the production efficiency.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A method of charging a lithium battery, comprising:
constant-current charging is carried out on a lithium battery by using a first charging current until the lithium battery reaches a first preset voltage;
stopping charging and keeping the preset time;
constant-current charging is carried out on the lithium battery by using a second charging current until the lithium battery reaches a second preset voltage;
and charging the lithium battery at constant voltage to full charge by using the second preset voltage.
2. The method of claim 1, further comprising, before the step of constant current charging the lithium battery at a first charging current until the lithium battery reaches a first predetermined voltage:
obtaining the type of the lithium battery, and determining values of a first preset voltage and a second preset voltage according to the type of the lithium battery;
wherein the first preset voltage is greater than the second preset voltage.
3. The method of claim 1, wherein the first charging current is 0.3C-0.5C, and the second charging current is 0.3C-0.5C.
4. The method of claim 1, wherein the predetermined time is 2 to 5 minutes.
5. The method of claim 1, wherein the step of charging the lithium battery to full charge at the second predetermined voltage comprises:
acquiring a third charging current in constant-voltage charging in real time;
and when the third charging current is 0.001-0.03C, judging that the lithium battery is fully charged.
6. A lithium battery charging device, comprising:
the first charging module is used for charging the lithium battery at a constant current by using a first charging current until the lithium battery reaches a first preset voltage;
the timing module is used for recording the preset time for stopping charging and keeping of the first charging module;
the second charging module is used for charging the lithium battery at a constant current by using a second charging current until the lithium battery reaches a second preset voltage;
and the third charging module is used for charging the lithium battery to full charge at constant voltage by using the second preset voltage.
7. A lithium battery charging apparatus as claimed in claim 6, further comprising:
the voltage determining module is connected with the first charging module and the second charging module and used for acquiring the type of the lithium battery and determining values of a first preset voltage and a second preset voltage according to the type of the lithium battery;
wherein the first preset voltage is greater than the second preset voltage.
8. The lithium battery charging device according to claim 6, wherein the first charging current has a magnitude of 0.3C to 0.5C, and the second charging current has a magnitude of 0.3C to 0.5C.
9. The lithium battery charging device as claimed in claim 6, wherein the predetermined time is 2 to 5 minutes.
10. The lithium battery charging apparatus of claim 6, wherein the third charging module is further configured to:
acquiring a third charging current in constant-voltage charging in real time;
and when the third charging current is 0.001-0.03C, judging that the lithium battery is fully charged.
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| CN202010953824.6A CN112104031A (en) | 2020-09-11 | 2020-09-11 | Lithium battery charging method and charging device |
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| CN202010953824.6A CN112104031A (en) | 2020-09-11 | 2020-09-11 | Lithium battery charging method and charging device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112964996A (en) * | 2021-04-25 | 2021-06-15 | 北京骑胜科技有限公司 | Battery detection method, device, equipment and storage medium |
| CN114243135A (en) * | 2021-12-16 | 2022-03-25 | 新余赣锋电子有限公司 | Capacity-grading-free electronic cigarette battery and full electrochemical forming method thereof |
| CN114683874A (en) * | 2020-12-25 | 2022-07-01 | 苏州宝时得电动工具有限公司 | Automatic working system, charging station and charging control method |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1988317A (en) * | 2005-12-21 | 2007-06-27 | 刘孝伟 | Self adaptive fixed flow intermittent pulse limit time charging method |
| CN105186053A (en) * | 2015-08-24 | 2015-12-23 | 长春理工大学 | Variable-current charging method of storage battery |
| JP2016131452A (en) * | 2015-01-14 | 2016-07-21 | 株式会社豊田自動織機 | Charging current controller and charging current controlling method |
| CN106785143A (en) * | 2016-12-29 | 2017-05-31 | 宁德新能源科技有限公司 | Method for charging batteries and device |
| CN110350240A (en) * | 2019-07-23 | 2019-10-18 | 蜂巢能源科技有限公司 | Ion lithium battery partial volume method and lithium ion battery |
| CN111211367A (en) * | 2020-01-13 | 2020-05-29 | 珠海冠宇电池有限公司 | Quick charging method of long-life lithium ion secondary battery |
| CN111509789A (en) * | 2019-01-30 | 2020-08-07 | 北京小米移动软件有限公司 | Charging method and device |
-
2020
- 2020-09-11 CN CN202010953824.6A patent/CN112104031A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1988317A (en) * | 2005-12-21 | 2007-06-27 | 刘孝伟 | Self adaptive fixed flow intermittent pulse limit time charging method |
| JP2016131452A (en) * | 2015-01-14 | 2016-07-21 | 株式会社豊田自動織機 | Charging current controller and charging current controlling method |
| CN105186053A (en) * | 2015-08-24 | 2015-12-23 | 长春理工大学 | Variable-current charging method of storage battery |
| CN106785143A (en) * | 2016-12-29 | 2017-05-31 | 宁德新能源科技有限公司 | Method for charging batteries and device |
| CN111509789A (en) * | 2019-01-30 | 2020-08-07 | 北京小米移动软件有限公司 | Charging method and device |
| CN110350240A (en) * | 2019-07-23 | 2019-10-18 | 蜂巢能源科技有限公司 | Ion lithium battery partial volume method and lithium ion battery |
| CN111211367A (en) * | 2020-01-13 | 2020-05-29 | 珠海冠宇电池有限公司 | Quick charging method of long-life lithium ion secondary battery |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114683874A (en) * | 2020-12-25 | 2022-07-01 | 苏州宝时得电动工具有限公司 | Automatic working system, charging station and charging control method |
| CN112964996A (en) * | 2021-04-25 | 2021-06-15 | 北京骑胜科技有限公司 | Battery detection method, device, equipment and storage medium |
| CN114243135A (en) * | 2021-12-16 | 2022-03-25 | 新余赣锋电子有限公司 | Capacity-grading-free electronic cigarette battery and full electrochemical forming method thereof |
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Application publication date: 20201218 |