CN112952223B - Battery charging method and device and battery management system - Google Patents
Battery charging method and device and battery management system Download PDFInfo
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- CN112952223B CN112952223B CN202110285159.2A CN202110285159A CN112952223B CN 112952223 B CN112952223 B CN 112952223B CN 202110285159 A CN202110285159 A CN 202110285159A CN 112952223 B CN112952223 B CN 112952223B
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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
- H01M10/441—Methods for charging or discharging for several batteries or cells simultaneously or sequentially
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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
- H01M10/4285—Testing apparatus
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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
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
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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
Abstract
The application is applicable to the technical field of storage batteries, and provides a battery charging method, a device and a battery management system, wherein the battery charging method comprises the following steps: acquiring voltage values of two ends of each battery cell acquired by a voltage acquisition unit connected with the battery in the charging process of the battery; if the voltage values at two ends of at least one battery cell in the voltage values at two ends of each battery cell collected at the first moment respectively reach the respective rated voltage value of the at least one battery cell, performing constant-voltage charging on the battery based on the first voltage value; the first voltage value is the sum of the voltage values at the two ends of all the battery cells at the first moment. The charging method provided by the application can enable all the battery cores in the battery to not trigger the overvoltage protection operation for the battery in the charging process, so that the charging and discharging loop of the battery can not be disconnected due to the overvoltage protection operation for the battery in the charging process of the battery, and the battery can be supplied with power for electrical appliances without interruption.
Description
Technical Field
The present application belongs to the field of battery technologies, and in particular, to a battery charging method and apparatus, and a battery management system.
Background
One of the functions of the battery management system is to perform overvoltage protection operation on the battery, generally, in the charging process of the battery, when the voltage value at two ends of one battery core in the battery reaches the overvoltage protection voltage value corresponding to the battery core, the battery management system is triggered to perform overvoltage protection operation on the battery, and when the battery management system performs overvoltage protection operation on the battery, the safety switch arranged in a charging and discharging loop is disconnected, so that the charging and discharging loop of the battery is cut off, and the battery cannot be charged and discharged.
Generally, as the service life of the battery increases, the cells in the battery may age, and the aging degrees of different cells may generally have differences, resulting in different charging rates of different cells in the battery. The existing charging method is generally used for charging a battery at a constant voltage based on the sum of rated voltage values of all battery cores, and because the charging rates of different battery cores in the battery are different, when the battery is charged by adopting the charging method, the situation that the voltage values at two ends of some battery cores reach the corresponding overvoltage protection voltage values, and some battery cores are not fully charged exists, and the situation can trigger a battery management system to perform overvoltage protection operation on the battery by mistake, so that a charging and discharging loop of the battery is disconnected, and the battery cannot realize uninterrupted power supply on an electrical appliance.
Disclosure of Invention
In view of this, embodiments of the present application provide a battery charging method and apparatus, and a battery management system, so as to solve the technical problem that, in an existing charging method, an overvoltage protection operation for a battery is triggered by a battery in a charging process by mistake, so that the battery cannot achieve uninterrupted power supply to an electrical appliance.
In a first aspect, an embodiment of the present application provides a method for charging a battery, where the battery includes a plurality of battery cells connected in series, and the battery is connected to a voltage acquisition unit, and the method includes:
acquiring voltage values of two ends of each electric core acquired by the voltage acquisition unit in the charging process of the battery;
if the voltage values at two ends of at least one battery cell in the voltage values at two ends of each battery cell acquired at the first moment respectively reach the respective rated voltage value of the at least one battery cell, performing constant-voltage charging on the battery based on the first voltage value; and the first voltage value is the sum of the voltage values at the two ends of the battery cell at the first moment.
Optionally, each of the battery cells is connected to one voltage relief unit; accordingly, after the constant-voltage charging of the battery based on the first voltage value, the charging method further includes:
sending a voltage relief instruction to a voltage relief unit connected with the at least one battery cell; the voltage bleeding instruction is used for instructing the voltage bleeding unit to execute voltage bleeding operation;
after the voltage values at the two ends of the at least one battery cell are all reduced to a second voltage value, performing constant-voltage charging on the battery based on a third voltage value until the voltage values at the two ends of each battery cell reach respective rated voltage values; and the third voltage value is greater than the first voltage value and less than or equal to a preset voltage value, and the preset voltage value is the sum of the rated voltage values of all the battery cells.
Optionally, the performing constant-voltage charging on the battery based on the third voltage value includes:
sequentially constant-voltage charging the battery based on a plurality of the incremented third voltage values, respectively.
Optionally, if, in the voltage values at the two ends of each of the electric cores acquired at the first time, the voltage values at the two ends of at least one electric core respectively reach the respective rated voltage value of the at least one electric core, performing constant-voltage charging on the battery based on the first voltage value includes:
and if the voltage values at two ends of at least one battery cell in the voltage values at two ends of each battery cell acquired at the first moment are respectively equal to the respective rated voltage value of the at least one battery cell, performing constant-voltage charging on the battery based on the first voltage value.
Optionally, if, in the voltage values at the two ends of each of the electric cores acquired at the first time, the voltage values at the two ends of at least one electric core respectively reach the respective rated voltage value of the at least one electric core, performing constant-voltage charging on the battery based on the first voltage value includes:
if the voltage values at two ends of at least one battery cell in the voltage values at two ends of each battery cell collected at the first moment are respectively greater than the respective rated voltage value of the at least one battery cell and less than the respective corresponding overvoltage protection voltage value of the at least one battery cell, performing constant voltage charging on the battery based on the first voltage value.
Optionally, if, in the voltage values at the two ends of each of the electric cores acquired at the first time, the voltage values at the two ends of other electric cores except the at least one electric core are all equal, the second voltage value is smaller than or equal to the voltage values at the two ends of other electric cores at the first time.
Optionally, if, in the voltage values at the two ends of each of the electric cores acquired at the first time, the voltage values at the two ends of other electric cores except the at least one electric core are not equal, the second voltage value is smaller than or equal to a minimum value of the voltage values at the two ends of other electric cores at the first time.
In a second aspect, an embodiment of the present application provides a charging device for a battery, where the battery includes a plurality of battery cells connected in series, the battery is connected to a voltage acquisition unit, and the charging device includes:
the voltage acquisition unit is used for acquiring voltage values at two ends of each electric core acquired by the voltage acquisition unit in the charging process of the battery;
the charging unit is used for performing constant-voltage charging on the battery based on a first voltage value if the voltage values at two ends of at least one battery cell in the voltage values at two ends of each battery cell acquired at the first moment respectively reach the respective rated voltage value of the at least one battery cell; and the first voltage value is the sum of the voltage values at the two ends of the battery cell at the first moment.
In a third aspect, an embodiment of the present application provides a battery management system, which is connected to a battery, where the battery includes a plurality of battery cells connected in series; the battery management system includes: the charging device comprises a voltage acquisition unit connected with the battery and a charging device connected with the voltage acquisition unit;
the voltage acquisition unit is used for acquiring voltage values at two ends of each electric core in the charging process of the battery;
the charging device is configured to perform the charging method according to the first aspect.
In a fourth aspect, the present application provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a processor, the computer program implements the charging method according to the first aspect or any optional manner of the first aspect.
In a fifth aspect, embodiments of the present application provide a computer program product, which, when run on a charging apparatus, causes the charging apparatus to perform the charging method according to the first aspect or any alternative manner of the first aspect.
The implementation of the battery charging method, the device, the battery management system, the computer readable storage medium and the computer program product provided by the embodiment of the application has the following beneficial effects:
in the charging method for the battery provided in the embodiment of the present application, the voltage values at two ends of each electrical core in the battery, which are acquired by the voltage acquisition unit in the charging process of the battery, are acquired, and when it is detected that the voltage value at two ends of at least one electrical core among the voltage values at two ends of each electrical core acquired at the first time reaches the rated voltage value, the battery is charged at a constant voltage based on the first voltage value, because the first voltage value is the sum of the voltage values at two ends of all the electrical cores at the first time, after the battery is charged at a constant voltage by using the first voltage value, the voltage value at two ends of each electrical core can not be increased any more after the first time, so that the voltage value at two ends of at least one electrical core cannot be increased any more to the corresponding overvoltage protection voltage value, and the overvoltage protection operation for the battery cannot be triggered, and the charging and discharging loop of the battery cannot be disconnected due to the overvoltage protection operation for the battery, therefore, the battery can realize uninterrupted power supply to the electrical appliance.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic flowchart of a charging method provided in an embodiment of the present application;
fig. 2 is a schematic flow chart of a charging method according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a charging device according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a battery management system according to an embodiment of the present application.
Detailed Description
In the embodiments of the present application, terms such as "first" and "second" are used to distinguish the same or similar items having substantially the same function and action. For example, the first voltage value and the second voltage value are only used for distinguishing different voltage values, and the sequence thereof is not limited. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.
It is noted that, in the present application, words such as "exemplary" or "for example" are used to mean exemplary, illustrative, or descriptive. Any embodiment or design described herein as "exemplary" or "e.g.," is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
In the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone, wherein A and B can be singular or plural.
Referring to fig. 1, fig. 1 is a schematic flowchart of a battery charging method according to an embodiment of the present disclosure. The charging method is performed by a charging device, which may be a charger, by way of example and not limitation. It should be noted that the charging method is applicable to a battery including a plurality of cells connected in series, and the battery is connected to a voltage acquisition unit for acquiring voltage values across the respective cells in the battery. The battery in the embodiment of the present application is a secondary battery (i.e., a secondary battery), such as a lithium ion battery.
As shown in fig. 1, the charging method may include S11 to S12, which are detailed as follows:
s11: and acquiring voltage values of two ends of each battery cell acquired by the voltage acquisition unit in the charging process of the battery.
In the embodiment of the application, when the charging device charges the battery, the constant current charging mode can be firstly adopted to perform constant current charging on the battery, and when the charging device performs constant current charging on the battery, the charging voltage of the battery can be kept at the preset voltage value. The preset voltage value is the sum of rated voltage values of all the battery cells in the battery, and the rated voltage value of each battery cell refers to the voltage value of two ends of each battery cell when the battery cells are fully charged.
It should be noted that rated voltage values of different battery cores in the battery may be the same or different, and are specifically set according to actual requirements, which is not limited herein. For example, when all the cells in the battery adopt the same cell, the voltage ratings of all the cells are the same.
In the whole charging process of the battery, the voltage acquisition unit can acquire the voltage values at two ends of each battery cell in the battery in real time; the voltage acquisition unit can also acquire the voltage values at two ends of each electric core in the battery at intervals of first time. The first time interval is greater than 0, and the specific value of the first time interval may be set according to actual requirements, which is not limited herein.
For example, the voltage collecting unit may include a plurality of voltage collecting circuits, each of which is configured to collect a voltage value across one cell in the battery, that is, the number of voltage collecting circuits in the voltage collecting unit may be the same as the number of cells in the battery. For another example, the voltage acquisition unit may also include only one voltage acquisition control chip, where the voltage acquisition control chip is connected to the positive electrode and the negative electrode of each cell, and the voltage acquisition control chip is used to acquire the voltage values at the two ends of each cell.
The charging device acquires voltage values of two ends of each battery cell acquired by the voltage acquisition unit in the charging process of the battery, and judges whether the voltage values of two ends of each battery cell acquired at each acquisition moment reach the rated voltage value of the battery cell.
In an embodiment of the application, if the charging device detects that, of the voltage values across the battery cells collected at a certain time (e.g., the first time), the voltage values across at least one battery cell respectively reach the respective rated voltage values of the at least one battery cell, the charging device performs S12.
In another embodiment of the present application, if the charging device detects that the voltage values at the two ends of all the battery cells collected at a certain time (for example, the first time) do not reach their respective rated voltage values, the charging device may continue to perform constant-current charging on the battery, and maintain the charging voltage at the preset voltage value.
In another embodiment of the present application, if the charging device detects that the voltage values across all the battery cells collected at a certain time (e.g., the first time) reach their respective rated voltage values, the charging device may stop charging the battery.
For example, if the battery includes 5 cells, the rated voltage of each cell is 3.6V. When charging the battery, the charging device may first perform constant current charging on the battery in a constant current charging manner, and maintain the charging voltage of the battery at 18V (i.e., 3.6V × 5). In the charging process of the battery, if the charging device detects that the voltage values at two ends of 2 battery cells in the voltage values at two ends of each battery cell collected at the first moment reach 3.6V, and the voltage values at two ends of other battery cells except the 2 battery cells do not reach 3.6V, the charging device executes S12; if the charging device detects that the voltage values at the two ends of all the battery cells collected at the first moment do not reach 3.6V, the charging device can continue to perform constant-current charging on the battery and keep the charging voltage at 18V; and if the charging device detects that the voltage values at the two ends of all the electric cores collected at the first moment reach 3.6V, the charging device stops charging the battery.
In a possible implementation manner, when the voltage value at the two ends of the battery cell reaches the rated voltage value of the battery cell, the following steps may be performed: and the voltage values at the two ends of the battery cell are equal to the rated voltage value of the battery cell.
In another possible implementation manner, when the voltage value at the two ends of the battery cell reaches the rated voltage value of the battery cell, the following steps may be performed: the voltage values at the two ends of the battery core are greater than the rated voltage value of the battery core and less than the overvoltage protection voltage value corresponding to the battery core. And the overvoltage protection voltage value corresponding to the battery cell is greater than the rated voltage value of the battery cell. For example, if the rated voltage value of a cell is 3.6V, the overvoltage protection voltage value corresponding to the cell may be 3.8V.
S12: and if the voltage values at two ends of at least one battery cell in the voltage values at two ends of each battery cell acquired at the first moment respectively reach the respective rated voltage value of the at least one battery cell, performing constant-voltage charging on the battery based on the first voltage value.
When the charging device detects that, among the voltage values at the two ends of each electric core acquired at the first time, the voltage values at the two ends of at least one electric core respectively reach the respective rated voltage values of the at least one electric core, in order to prevent the voltage values at the two ends of the at least one electric core from increasing after the first time, the charging device may perform constant-voltage charging on the battery based on the first voltage value at this time.
The first voltage value is the sum of the voltage values at the two ends of all the battery cells at the first moment.
The charging device performs constant-voltage charging on the battery based on the first voltage value: the charging device charges the battery at a constant voltage by using the first voltage value as a charging voltage of the battery.
For example, if the battery includes 5 battery cells, and the rated voltage value of each battery cell is 3.6V, in the charging process of the battery, if the voltage values at two ends of 2 battery cells are 3.6V and the voltage values at two ends of other 3 battery cells are 3V in the voltage values at two ends of each battery cell acquired at the first time, the charging device performs constant voltage charging on the battery with the charging voltage of 16.2V (that is, 3.6V × 2+3V × 3) at this time, so that it can be ensured that the voltage values at two ends of all the battery cells do not increase any more after the first time.
As can be seen from the above, in the charging method for a battery provided in this embodiment, the voltage values at two ends of each electrical core in the battery, which are acquired by the voltage acquisition unit in the charging process of the battery, are acquired, and when it is detected that the voltage value at two ends of at least one electrical core among the voltage values at two ends of each electrical core acquired at the first time reaches the rated voltage value thereof, the battery is charged at a constant voltage based on the first voltage value, because the first voltage value is the sum of the voltage values at two ends of all the electrical cores at the first time, after the battery is charged at the constant voltage by using the first voltage value, the voltage value at two ends of each electrical core is not raised any more after the first time, so that the voltage values at two ends of the at least one electrical core cannot be raised any more to the corresponding overvoltage protection voltage value thereof, and the overvoltage protection operation for the battery is not triggered, and the charging and discharging loop of the battery is not disconnected due to the overvoltage protection operation for the battery, therefore, the battery can realize uninterrupted power supply to the electrical appliance.
Referring to fig. 2, fig. 2 is a schematic flowchart of a battery charging method according to another embodiment of the present disclosure. With respect to the embodiment corresponding to fig. 1, each battery cell in this embodiment is further connected to a voltage bleeding unit, and the voltage bleeding unit is configured to bleed voltage across the connected battery cell, based on which, as shown in fig. 2, the charging method in this embodiment may further include, after S12, S13 to S14, which are detailed as follows:
s13: and sending a voltage relief instruction to a voltage relief unit connected with the at least one battery cell.
The voltage bleeding instruction is used for instructing the voltage bleeding unit to execute voltage bleeding operation. When the voltage relief unit performs a voltage relief operation, the voltage across the battery cell connected to the voltage relief unit may be reduced.
In this embodiment, in order to finally enable each electric core to be fully charged, the charging device sends a voltage bleeding instruction to each voltage bleeding unit connected to the at least one electric core after performing constant voltage charging on the battery based on the first voltage value, so that each voltage bleeding unit connected to the at least one electric core performs voltage bleeding operation on the at least one electric core, and further, the voltage values at two ends of the at least one electric core are reduced.
S14: and after the voltage values at the two ends of the at least one battery cell are all reduced to the second voltage value, carrying out constant voltage charging on the battery based on a third voltage value until the voltage values at the two ends of each battery cell reach the respective rated voltage value.
In this embodiment, because the voltage acquisition unit can gather in real time or gather the voltage value at each electric core both ends based on first time interval in the charging process of battery, charging device can acquire the voltage value at each electric core both ends that the voltage acquisition unit gathered, consequently, charging device can monitor the voltage value at each electric core both ends in whole charging process. Based on this, after the voltage relief unit connected to the at least one battery cell performs the voltage relief operation, if the charging device monitors that the voltage values at the two ends of the at least one battery cell are all reduced to the second voltage value, the battery is charged at a constant voltage based on the third voltage value.
In a possible implementation manner, if the voltage values at two ends of each of the battery cells collected at the first time are the same as the voltage values at two ends of other battery cells except the at least one battery cell, the second voltage value may be smaller than or equal to the voltage values at two ends of other battery cells at the first time.
For example, if the battery includes 5 battery cells, and the rated voltage value of each battery cell is 3.6V, if, of the voltage values across the battery cells collected at the first time, the voltage values across 2 battery cells are 3.6V, and the voltage values across the other 3 battery cells are 3V, the second voltage value may be 3V.
In another possible implementation manner, if, in the voltage values at the two ends of each battery cell collected at the first time, the voltage values at the two ends of other battery cells except the at least one battery cell are different, the second voltage value may be smaller than or equal to a minimum value of the voltage values at the two ends of other battery cells at the first time.
For example, if the battery includes 5 battery cells, and the rated voltage value of each battery cell is 3.6V, if, of the voltage values at two ends of each battery cell collected at the first time, the voltage values at two ends of 2 battery cells are 3.6V, and the voltage values at two ends of the other 3 battery cells are 3V, 2.8V, and 2.6V, respectively, then the second voltage value may be 2.6V.
That is, when the voltage value across the at least one battery cell decreases to be the same as or smaller than the voltage values across the other battery cells, the charging device performs constant-voltage charging on the battery based on the third voltage value.
In this embodiment, the third voltage value is greater than the first voltage value and less than or equal to the predetermined voltage value.
In one possible implementation, the charging device performing constant-voltage charging on the battery based on the third voltage value may include: and performing constant-voltage charging on the battery based on one third voltage value.
In this implementation manner, after the voltage values at the two ends of the at least one battery cell are all reduced to the second voltage value, the charging device may perform constant-voltage charging on the battery based on a fixed third voltage value until the voltage values at the two ends of each battery cell all reach their respective rated voltage values.
For example, when the first voltage value is 16.2V and the preset voltage value is 18V, the third voltage value may be 18V, that is, after the voltage values at both ends of the at least one battery cell are all decreased to the second voltage value, the charging device performs constant-voltage charging on the battery based on the charging voltage of 18V.
In another possible implementation, the charging device performing constant-voltage charging on the battery based on the third voltage value may include: and sequentially performing constant-voltage charging on the batteries based on a plurality of increasing third voltage values respectively.
In this implementation, after the voltage values at the two ends of the at least one battery cell are all reduced to the second voltage value, the charging device may sequentially perform constant-voltage charging on the voltage based on a plurality of increasing third voltage values until the voltage values at the two ends of each battery cell all reach their respective rated voltage values.
In the plurality of incremental third voltage values, a difference between every two adjacent third voltage values may be the same or different, and is specifically set according to an actual requirement, which is defined herein. For example, when the first voltage value is 16.2V and the preset voltage value is 18V, the third voltage value may include: 17V, 17.5V, and 18V, that is, after the voltage values at the two ends of the at least one battery cell are all reduced to the second voltage value, the charging device sequentially performs constant-voltage charging on the battery based on the charging voltages of 17V, 17.5V, and 18V.
In this implementation, the charging device gradually increases the charging voltage of the battery when performing constant-voltage charging on the battery, so that the voltage values at two ends of each battery cell in the battery can be increased more smoothly.
In this embodiment, the charging device performs constant-voltage charging on the battery based on the third voltage value until the voltage value at both ends of each battery cell reaches its respective rated voltage value, which means that: and the charging device performs constant-voltage charging on the battery based on the third voltage value, and stops charging the battery when the voltage values at the two ends of each battery cell reach the respective rated voltage values.
As can be seen from the above, in the charging method provided in this embodiment, after the voltage values at the two ends of at least one battery cell are all reduced to the second voltage value, because the voltage values at the two ends of all the battery cells in the battery at this time do not reach their respective rated voltage values, the charging device performs constant-voltage charging on the battery based on the third voltage value that is greater than the first voltage value and is less than or equal to the preset voltage value at this time, and the voltage values at the two ends of each battery cell can continue to be increased until the voltage values at the two ends of each battery cell all reach their respective rated voltage values, that is, when the voltage values at the two ends of each battery cell all reach their respective rated voltage values, the charging device stops charging the battery. Therefore, in the charging process of the battery, the charging device can dynamically adjust the charging voltage of the battery according to the voltage values at the two ends of each electric core in the battery at different moments, so that the overvoltage protection operation of the battery can be prevented from being triggered by mistake, and the battery can be fully charged.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Based on the charging method provided by the above embodiment, an embodiment of the charging device implementing the above method embodiment is further provided in the embodiment of the present invention.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a battery charging device according to an embodiment of the present disclosure. For convenience of explanation, only the portions related to the present embodiment are shown. The charging device 30 provided in this embodiment is used to charge a battery including a plurality of cells connected in series, and the battery is connected to a voltage acquisition unit. As shown in fig. 3, the charging device 30 includes: a voltage acquisition unit 31 and a charging unit 32. Wherein:
the voltage acquiring unit 31 is configured to acquire voltage values at two ends of each electric core acquired by the voltage acquiring unit in a charging process of the battery.
The charging unit 32 is configured to, if, in the voltage values at the two ends of each of the battery cells collected at the first time, the voltage values at the two ends of at least one of the battery cells respectively reach the respective rated voltage values of the at least one of the battery cells, perform constant-voltage charging on the battery based on the first voltage value; and the first voltage value is the sum of the voltage values at the two ends of the battery cell at the first moment.
Optionally, each battery cell is connected to a voltage relief unit, and correspondingly, the charging device 30 further includes a first transmitting unit.
The first sending unit is used for sending a voltage relief instruction to a voltage relief unit connected with the at least one battery cell; the voltage bleeding instruction is used for instructing the voltage bleeding unit to execute voltage bleeding operation.
The charging unit 32 is further configured to, after the voltage values at the two ends of the at least one electrical core are both reduced to the second voltage value, perform constant-voltage charging on the battery based on a third voltage value until the voltage values at the two ends of each electrical core reach their respective rated voltage values; and the third voltage value is greater than the first voltage value and less than or equal to a preset voltage value, and the preset voltage value is the sum of the rated voltage values of all the battery cells.
Optionally, the charging unit 32 is configured to:
sequentially constant-voltage charging the battery based on a plurality of the incremented third voltage values, respectively.
Optionally, the charging unit 32 is specifically configured to:
and if the voltage values at two ends of at least one battery cell in the voltage values at two ends of each battery cell acquired at the first moment are respectively equal to the respective rated voltage value of the at least one battery cell, performing constant-voltage charging on the battery based on the first voltage value.
Optionally, the charging unit 32 is specifically configured to:
if the voltage values at two ends of at least one battery cell in the voltage values at two ends of each battery cell collected at the first moment are respectively greater than the respective rated voltage value of the at least one battery cell and less than the respective corresponding overvoltage protection voltage value of the at least one battery cell, performing constant voltage charging on the battery based on the first voltage value.
Optionally, if, in the voltage values at the two ends of each of the electric cores acquired at the first time, the voltage values at the two ends of other electric cores except the at least one electric core are all equal, the second voltage value is smaller than or equal to the voltage values at the two ends of other electric cores at the first time.
Optionally, if, in the voltage values at the two ends of each of the electric cores acquired at the first time, the voltage values at the two ends of other electric cores except the at least one electric core are not equal, the second voltage value is smaller than or equal to a minimum value of the voltage values at the two ends of other electric cores at the first time.
It should be noted that, for the information interaction, the execution process, and other contents between the above units, the specific functions and the technical effects brought by the method embodiments of the present application are based on the same concept, and specific reference may be made to the method embodiment part, which is not described herein again.
The embodiment of the application also provides a computer readable storage medium. The computer-readable storage medium has stored therein a computer program which, when executed by a processor, can implement the charging method described above.
The embodiment of the present application provides a computer program product, which, when running on a charging device, causes the charging device to execute the charging method described above.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a battery management system according to an embodiment of the present application, and for convenience of description, only a part related to the embodiment is shown. As shown in fig. 4, the battery management system 100 is connected to a battery 200. The battery 200 includes a plurality of cells connected in series. The battery management system 100 includes: a voltage acquisition unit 11 connected with the battery 200 and a charging device 12 connected with the voltage acquisition unit 11. Wherein:
the voltage collecting unit 11 is used for collecting voltage values at two ends of each battery cell in the battery 200 in the charging process of the battery 200.
The positive output terminal of the charging device 12 is connected to the positive pole of the battery 200, the negative output terminal of the charging device 12 is connected to the negative pole of the battery 200, and the charging device 12 is used to perform the charging method in the embodiment corresponding to fig. 1 or fig. 2. It should be noted that, the detailed functions and technical effects of the charging device 12 in this embodiment can refer to the related description of the method embodiment, and are not repeated herein.
In an embodiment of the present application, the voltage collecting unit 11 may collect voltage values at two ends of each battery cell in the battery 200 in real time during a charging process of the battery 200, and send the collected voltage values at two ends of each battery cell to the charging device 12. Based on this, the charging device 12 can acquire the voltage values across the respective battery cells at each time during the charging process of the battery 200.
In another embodiment of the present application, the voltage collecting unit 11 may collect voltage values at two ends of each battery cell in the battery 200 every first time interval during the charging process of the battery 200, and send the collected voltage values at two ends of each battery cell to the charging device 12. The first time interval is greater than 0, and the specific value of the first time interval may be set according to actual requirements, which is not limited herein. Based on this, the charging device 12 can obtain the voltage values at two ends of each battery cell at a plurality of fixed times during the charging process of the battery 200.
In practical applications, the voltage collecting unit 11 may include a plurality of voltage collecting circuits, and each voltage collecting circuit is configured to collect a voltage value across one electrical core. The specific structure of the voltage acquisition circuit can be set according to actual requirements, and is not limited here. Or the voltage acquisition unit 11 may also include only one voltage acquisition control chip, where the voltage acquisition control chip is connected to the positive electrode and the negative electrode of each battery cell, and the voltage acquisition control chip is used to acquire the voltage values at the two ends of each battery cell.
In another embodiment of the present application, as shown in fig. 4, the battery management system 100 further includes a plurality of voltage bleeding units 13, each voltage bleeding unit 13 is connected between a positive electrode and a negative electrode of one battery cell, and the voltage bleeding unit 13 is configured to perform a voltage bleeding operation on the battery cell connected thereto. Specifically, when the voltage relief unit 13 receives a voltage relief instruction sent by the charging device 12, the voltage relief operation is performed, so that the voltage across the battery cell connected thereto can be reduced.
In the above embodiments, the description of each embodiment has its own emphasis, and parts that are not described or illustrated in a certain embodiment may refer to the description of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (7)
1. A charging method of a battery, wherein the battery includes a plurality of cells connected in series, each of the cells is connected to a voltage tapping unit, and the battery is connected to a voltage collecting unit, the charging method comprising:
acquiring voltage values of two ends of each electric core acquired by the voltage acquisition unit in the charging process of the battery;
if the voltage values at two ends of at least one battery cell in the voltage values at two ends of each battery cell acquired at the first moment respectively reach the respective rated voltage value of the at least one battery cell, performing constant-voltage charging on the battery based on the first voltage value; the first voltage value is the sum of voltage values at two ends of the battery cell at the first moment;
after the battery is subjected to constant voltage charging based on the first voltage value, sending a voltage relief instruction to a voltage relief unit connected with the at least one battery cell; the voltage bleeding instruction is used for instructing the voltage bleeding unit to execute voltage bleeding operation;
after the voltage values at the two ends of the at least one battery cell are all reduced to a second voltage value, performing constant-voltage charging on the battery based on a third voltage value until the voltage values at the two ends of each battery cell reach respective rated voltage values; the third voltage value is greater than the first voltage value and less than or equal to a preset voltage value, and the preset voltage value is the sum of the rated voltage values of all the battery cells; the second voltage value is less than or equal to the voltage values at the two ends of the other battery cells except the at least one battery cell at the first moment, or the second voltage value is less than or equal to the minimum value of the voltage values at the two ends of the other battery cells at the first moment.
2. The charging method according to claim 1, wherein the constant-voltage charging the battery based on the third voltage value includes:
sequentially constant-voltage charging the battery based on a plurality of the incremented third voltage values, respectively.
3. The charging method according to claim 1 or 2, wherein if, in the voltage values across the battery cells collected at the first time, the voltage values across the other battery cells except the at least one battery cell are all equal, the second voltage value is less than or equal to the voltage values across the other battery cells at the first time.
4. The charging method according to claim 1 or 2, wherein if, in the voltage values across the battery cells acquired at the first time, the voltage values across the other battery cells except the at least one battery cell are not equal to each other, the second voltage value is less than or equal to a minimum value among the voltage values across the other battery cells at the first time.
5. A charging device for a battery, wherein the battery comprises a plurality of cells connected in series, each of the cells is connected to a voltage tapping unit, the battery is connected to a voltage collecting unit, the charging device comprises:
the voltage acquisition unit is used for acquiring voltage values at two ends of each electric core acquired by the voltage acquisition unit in the charging process of the battery;
the charging unit is used for performing constant-voltage charging on the battery based on a first voltage value if the voltage values at two ends of at least one battery cell in the voltage values at two ends of each battery cell collected at the first moment respectively reach the respective rated voltage value of the at least one battery cell; the first voltage value is the sum of voltage values at two ends of all the battery cells at the first moment;
the charging device further comprises a first transmitting unit;
the first sending unit is used for sending a voltage relief instruction to a voltage relief unit connected with the at least one battery cell after the battery is subjected to constant voltage charging based on the first voltage value; the voltage bleeding instruction is used for instructing the voltage bleeding unit to execute voltage bleeding operation;
the charging unit is further configured to, after the voltage values at the two ends of the at least one battery cell are both reduced to the second voltage value, perform constant-voltage charging on the battery based on a third voltage value until the voltage values at the two ends of each battery cell reach their respective rated voltage values; the third voltage value is greater than the first voltage value and less than or equal to a preset voltage value, wherein the preset voltage value is the sum of the rated voltage values of all the battery cells; the second voltage value is less than or equal to the voltage values at the two ends of the other battery cells except the at least one battery cell at the first moment, or the second voltage value is less than or equal to the minimum value of the voltage values at the two ends of the other battery cells at the first moment.
6. A battery management system connected to a battery, the battery comprising a plurality of cells connected in series; it is characterized in that each battery core is connected with a voltage bleeder unit, and the battery management system comprises: the charging device is connected with the voltage acquisition unit;
the voltage acquisition unit is used for acquiring voltage values at two ends of each electric core in the charging process of the battery;
the charging device is used for executing the charging method according to any one of claims 1 to 4.
7. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, implements the charging method according to any one of claims 1 to 4.
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Inventor after: Wu Qiming Inventor after: Wu Peiji Inventor after: Cai Gang Inventor before: Zhao Zhenchao |