CN112993422A - Energy storage unit charging method - Google Patents
Energy storage unit charging method Download PDFInfo
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- CN112993422A CN112993422A CN201911307115.4A CN201911307115A CN112993422A CN 112993422 A CN112993422 A CN 112993422A CN 201911307115 A CN201911307115 A CN 201911307115A CN 112993422 A CN112993422 A CN 112993422A
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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
- H01M10/4242—Regeneration of electrolyte or reactants
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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
- H01M10/446—Initial charging measures
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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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Abstract
The application provides an energy storage unit charging method, which comprises the following steps. First, a first energy storage unit and a second energy storage unit are provided, and the first energy storage unit and the second energy storage unit are connected in series in a first current path. And, a power converter is provided for providing a first charging current to the first current path. Then, the voltages of the first energy storage unit and the second energy storage unit are respectively detected, so as to obtain a first voltage value and a second voltage value. Then, whether one of the first voltage value and the second voltage value reaches the default voltage is determined. When the first voltage value reaches the default voltage and the second voltage value does not reach the default voltage, the first current path is set to bypass the first energy storage unit.
Description
Technical Field
The present disclosure relates to a charging method, and more particularly, to a charging method for simultaneously charging a plurality of energy storage units.
Background
Generally, after the battery is manufactured, the battery needs to be placed in a battery formation device, and the battery can normally function after a certain period of formation procedure. For example, the battery formation equipment performs a series of charging and discharging operations on the battery, so that active substances in the battery can be activated. In addition, the battery formation equipment is provided with a plurality of power converters, each power converter is electrically connected to only one battery, and the respective batteries are charged and discharged by the power converters. Conventionally, the power converter and the battery are connected in a one-to-one manner in order to seek stability of a system and avoid interference of other power converters when the battery is charged and discharged. However, as will be appreciated by those skilled in the art, the large number of power converters not only occupies a large space, but also has a relatively high cost.
On the other hand, if a plurality of batteries are connected in series by only one power converter, it is difficult to accurately supply a charging voltage or a charging current required for each battery, and there is a possibility that the efficiency of battery formation may be reduced. Accordingly, there is a need for a more efficient and cost effective way to charge batteries.
Disclosure of Invention
In view of the above, the present application provides a method for charging an energy storage unit, which can use one power converter to charge a plurality of energy storage units and determine whether the energy storage units have been charged to a default voltage.
The application provides an energy storage unit charging method, which comprises the following steps. First, a first energy storage unit and a second energy storage unit are provided, and the first energy storage unit and the second energy storage unit are connected in series in a first current path. And, a power converter is provided for providing a first charging current to the first current path. Then, the voltages of the first energy storage unit and the second energy storage unit are respectively detected, so as to obtain a first voltage value and a second voltage value. Then, whether one of the first voltage value and the second voltage value reaches the default voltage is determined. When the first voltage value reaches the default voltage and the second voltage value does not reach the default voltage, the first current path is set to bypass the first energy storage unit.
In some embodiments, the first charging current is a constant current, and the first charging current is set to a first current value. In addition, the method for charging the energy storage unit further comprises the following steps. First, after the first current path is set to bypass the first energy storage unit, it can be determined whether the second voltage value reaches the default voltage. When the second voltage value reaches the default voltage, the first current path can be set to pass through the first energy storage unit and the second energy storage unit. And when the second voltage value reaches the default voltage, the power converter can be set to provide the second charging current for the first current path. The second charging current may be a constant current, and the second charging current is set to have a second current value smaller than the first current value.
The application also provides an energy storage unit charging method, which comprises the following steps. First, a first energy storage unit and a second energy storage unit are provided, and the first energy storage unit and the second energy storage unit are connected in series in a first current path. And, a power converter is provided for providing a first charging current to the first current path. Then, the voltages of the first energy storage unit and the second energy storage unit are respectively detected, so as to obtain a first voltage value and a second voltage value. Then, whether the first voltage value and the second voltage value both reach the default voltage is determined. When the first voltage value and the second voltage value both reach the default voltage, the power converter is set to provide the second charging current for the first current path.
In some embodiments, the first charging current and the second charging current are constant currents, the first charging current is set to have a first current value, the second charging current is set to have a second current value, and the second current value may be smaller than the first current value. In addition, the method for charging the energy storage unit further comprises the following steps. First, whether one of the first voltage value and the second voltage value reaches a default voltage is determined, and when the first voltage value reaches the default voltage and the second voltage value does not reach the default voltage, the first current path can be set to bypass the first energy storage unit.
In summary, the energy storage unit charging method provided by the present application can determine whether each energy storage unit has been charged to the default voltage, in addition to charging a plurality of energy storage units with one power converter. And when part of the energy storage units are charged to the default voltage, bypassing the energy storage units which have reached the default voltage, and continuously charging the energy storage units which have not reached the default voltage. When all the energy storage units are charged to the default voltage, all the energy storage units are conducted, and all the energy storage units are continuously charged by using lower charging current. Therefore, the energy storage unit charging method provided by the application can have lower hardware cost and can improve the formation efficiency.
Further details regarding other functions and embodiments of the present application are described below with reference to the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a circuit diagram illustrating a charging method using an energy storage unit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of current and voltage of a first energy storage unit according to an embodiment of the present application
FIG. 3 is a schematic diagram of current and voltage of a second energy storage unit according to an embodiment of the present application;
FIG. 4 is a flowchart illustrating steps of a method for charging an energy storage unit according to an embodiment of the present disclosure
Fig. 5 is a flowchart illustrating steps of a method for charging an energy storage unit according to another embodiment of the present disclosure.
Description of the symbols
10 power supply 11 power converter
12 voltage detection unit 13 switch control unit
14 switch 15 voltage detecting unit
16 switch control unit 17 switch
20 energy storage unit (first energy storage unit)
22 energy storage unit (second energy storage unit)
Flow of A-F endpoints S400-S410
S500-S510 Process
Detailed Description
The foregoing and other technical matters, features and effects of the present application will be apparent from the following detailed description of a preferred embodiment, which is to be read in connection with the accompanying drawings. Directional terms as referred to in the following examples, for example: up, down, left, right, front or rear, etc., are simply directions with reference to the drawings. Accordingly, the directional terminology used is intended to be in the nature of words of description rather than of limitation.
Referring to fig. 1, fig. 1 is a circuit diagram illustrating a charging method using an energy storage unit according to an embodiment of the present application. As shown in fig. 1, the energy storage unit charging method of the present application may be applied to a charging system, which may be, for example, a battery formation device or a charging device for various batteries, and the present embodiment is not limited herein. In addition, the charging system may include a power supply 10, a power converter 11, a voltage detection unit 12, a switch control unit 13, a switch 14, a voltage detection unit 15, a switch control unit 16, and a switch 17. The voltage detecting unit 12, the switch control unit 13, and the switch 14 correspond to the energy storage unit 20 (the first energy storage unit), and the voltage detecting unit 15, the switch control unit 16, and the switch 17 correspond to the energy storage unit 22 (the second energy storage unit). It should be noted that although fig. 1 only shows two energy storage units, the present application is not limited thereto, for example, the energy storage unit charging method of the present application can also be applied to 3 or more than 3 energy storage units. The energy storage unit charging method of the present application is illustrated by each component in the charging system.
The power supply 10 shown in fig. 1 can provide ac or dc power, and can output the power to the power converter 11, and the power converter 11 converts the power received from the power supply 10 into dc power to charge the energy storage unit 20 and the energy storage unit 22. In practice, the power converter 11 may include an ac-to-dc converter (ac/dc converter) and/or a dc-to-dc converter (dc/dc converter), and the embodiment is not limited herein. In addition, when the power converter 11 charges the energy storage unit 20 and the energy storage unit 22, the power converter 11, the energy storage unit 20, and the energy storage unit 22 may be connected in series in the same current path (first current path), and the power converter 11 outputs charging currents of different magnitudes to the current paths at different time points.
Here, the power converter 11, the energy storage unit 20 and the energy storage unit 22 are not fixedly electrically connected in the first current path, and the first current path may also bypass (bypass) the energy storage unit 20 and the energy storage unit 22. In one example, the energy storage unit 20 may be electrically connected to the power converter 11 through the switch 14. As shown in fig. 1, the switch 14 may be, for example, a three-terminal device, wherein the terminal a may be electrically connected to the power converter 11, the terminal B may be electrically connected to the energy storage unit 20, and the terminal C may be connected to the terminal D of the switch 17. In practice, the switch 14 may be controlled by the switch control unit 13, and when the switch control unit 13 controls the switch 14 to conduct the terminal a to the terminal B, it can be seen that the energy storage unit 20 is connected in series in the first current path. On the contrary, when the switch control unit 13 controls the switch 14 to conduct the terminal a to the terminal C, it can be regarded that the energy storage unit 20 is bypassed (bypassed) and is no longer connected in series in the first current path.
Similarly, the energy storage unit 22 may also be electrically connected to the power converter 11 through the switch 17. As shown in fig. 1, the switch 17 may also be a three-terminal device, wherein the terminal D may be electrically connected to the energy storage unit 20 and the terminal C of the switch 14, the terminal E may be electrically connected to the energy storage unit 22, and the terminal F may be connected back to the power converter 11. In addition, the switch 17 may be controlled by the switch control unit 16, and when the switch control unit 16 controls the switch 17 to conduct the terminal D to the terminal E, it can be seen that the energy storage unit 22 is connected in series in the first current path. Conversely, when the switch control unit 16 controls the switch 17 to conduct the terminal D to the terminal F, it can be regarded that the energy storage unit 22 is bypassed and is no longer connected in series in the first current path.
In practice, the switch control unit 13 and the switch control unit 16 can be controlled by the voltage detection unit 12 and the voltage detection unit 15, respectively. In one example, the voltage detecting unit 12 may be electrically connected to the positive and negative terminals of the energy storage unit 20, and detect the voltage of the energy storage unit 20 to generate the first voltage value. Similarly, the voltage detecting unit 15 can be electrically connected to the positive and negative terminals of the energy storage unit 22, and detect the voltage of the energy storage unit 22 to generate the second voltage value. At this time, the voltage detecting unit 12 and the voltage detecting unit 15 can respectively determine whether the first voltage value and the second voltage value reach a default voltage. When the voltage detection unit 12 determines that the first voltage value reaches the default voltage, the voltage detection unit 12 may send a command to the switch control unit 13, and the switch control unit 13 controls the switch 14 to turn on the terminal a to the terminal C, so that the energy storage unit 20 may be bypassed and charging may not be continued. Similarly, regarding the voltage detecting unit 15, the switch control unit 16, the switch 17 and the energy storage unit 22 alone, but not discussing other energy storage units in the first current path, when the voltage detecting unit 15 determines that the second voltage value reaches the default voltage, the voltage detecting unit 15 may send a command to the switch control unit 16, and the switch control unit 16 controls the switch 17 to turn on the terminal D to the terminal F, so that the energy storage unit 22 may be bypassed and charging may not be continued.
However, since there are multiple energy storage units in the first current path, when all the energy storage units reach the default voltage, the operation of the charging system is different from that of the charging system in which there is only a single energy storage unit in the first current path. For example, the voltage detecting unit 12 and the voltage detecting unit 15 can not only send commands to the switch control unit 13 and the switch control unit 16, but also transmit charging information of the energy storage unit 20 and the energy storage unit 22 to the power converter 11. In other words, the power converter 11 can know whether all the energy storage units (such as the energy storage unit 20 and the energy storage unit 22 in fig. 1) in the first current path reach the default voltage. The default voltage may be equal to or higher than the default voltage, and the embodiment is not limited. In an example, the energy storage units 20 and 22 may reach the default voltage sequentially, and it is assumed that the energy storage unit 22 reaches the default voltage first, since the voltage detection unit 15 can know from the power converter 11 that other energy storage units in the first current path do not reach the default voltage, the voltage detection unit 15 can instruct the switch control unit 16 to bypass the energy storage unit 22 by the switch 17.
Then, when the energy storage unit 20 subsequently reaches the default voltage, since the voltage detection unit 12 can know from the power converter 11 that other energy storage units (e.g., the energy storage unit 22 in fig. 1) in the first current path have all reached the default voltage, the voltage detection unit 12 can instruct the switch control unit 13 to leave the energy storage unit 20 in the first current path (not bypassed by the switch 14). In practice, when all the energy storage units reach the default voltage, the voltage detection unit 15 instructs the switch control unit 16 to connect the energy storage unit 22 back to the first current path in series. The power converter 11 charges the energy storage unit 20 and the energy storage unit 22 with the second charging current. In one example, the second charging current corresponds to a second current value, and the second current value is smaller than the first current value of the first charging current. In other words, the power converter 11 of the present embodiment performs a plurality of cycles of charging, when all the energy storage units reach the default voltage in the first round of charging, the energy storage units that were bypassed are connected in series again and return to the first current path, and the power converter 11 performs a second round of charging on all the energy storage units with a smaller charging current.
In order to describe in more detail how the energy storage unit charging method of the present application is applied to a charging system, the following description is made with reference to a corresponding example. Please refer to fig. 1, fig. 2 and fig. 3. Fig. 2 is a schematic current-voltage diagram of a first energy storage unit according to an embodiment of the present application, and fig. 3 is a schematic current-voltage diagram of a second energy storage unit according to an embodiment of the present application. Fig. 2 illustrates a possible charging state of the energy storage unit 20, wherein a voltage V20 between the positive terminal and the negative terminal of the energy storage unit 20 is plotted versus time at the top of fig. 2, and a charging current I20 of the energy storage unit 20 is plotted versus time at the bottom of fig. 2. Similarly, fig. 3 illustrates a possible charging state of the energy storage unit 22, wherein the voltage V22 between the positive terminal and the negative terminal of the energy storage unit 22 is shown in the upper part of fig. 3, and the charging current I22 of the energy storage unit 22 is shown in the lower part of fig. 3.
As can be seen from fig. 2 and 3, before time T0, the voltages V20 and V22 across the positive and negative terminals of the energy storage unit 20 and the energy storage unit 22 have not yet reached the default voltage Vset, so that the energy storage unit 20 and the energy storage unit 22 are also connected in series in the first current path and both receive the charging current Iset1 (first charging current) from the power converter 11. It can be noted that the voltage V20 across the positive and negative terminals of the energy storage unit 20 and the voltage V22 across the positive and negative terminals of the energy storage unit 22 both exhibit a tendency to increase in steps due to the stable charging current Iset 1. At time T0, the voltage V22 of the energy storage unit 22 reaches the default voltage Vset, and the voltage detection unit 15 instructs the switch control unit 16 to bypass the energy storage unit 22 by the switch 17 as described above. The voltage detecting unit 15 can report the voltage to the power converter 11, and inform the voltage V22 of the energy storage unit 22 to reach the default voltage Vset.
As can be seen from fig. 3, after the energy storage unit 22 is bypassed by the switch 17, since the energy storage unit 22 is not in the first current path, the charging current I22 of the energy storage unit 22 should be zero, and the voltage V22 across the positive and negative terminals of the energy storage unit 22 is slightly decreased (less than the default voltage Vset). In detail, since the voltage V22 is measured by the voltage detecting unit 15 outside the energy storage unit 22, it is not completely the cell voltage of the energy storage unit 22. Therefore, assuming that the cell voltage of the energy storage unit 22 is Vcap2 and the internal resistance of the energy storage unit 22 is R22, the voltage V22 can be expressed as the following equation (1):
V22＝Vcap2+I22×R22 (1)
as will be understood by those skilled in the art, when the energy storage unit 22 is bypassed by the switch 17 to return the charging current I22 to zero, the voltage V22 measured by the voltage detection unit 15 is Vcap2 of the battery cell of the energy storage unit 22, and since the term "I22 × R22" is less, the voltage V22 is slightly decreased. Of course, the cell voltage Vcap2 or the internal resistor R22 are only exemplary and are not intended to limit various parameters of the energy storage unit 22. Since the energy storage unit 22 is in an open state, the voltage V22 between the positive and negative terminals of the energy storage unit 22 should be substantially constant from time T0 to time T1.
Also between time T0 and time T1, the energy storage cell 20 is still in the first current path because the default voltage Vset has not been reached yet, and is charged by the charging current Iset1 (first charging current) provided by the power converter 11. Until time T1, the energy storage unit 20 just reaches the default voltage Vset, and the voltage detection unit 12 can also report the default voltage Vset to the power converter 11, which informs that the voltage V20 of the energy storage unit 20 reaches the default voltage Vset. Since the power converter 11 receives the reports from all the voltage detecting units (the voltage detecting unit 12 and the voltage detecting unit 15) in the first current path, it can be known that all the energy storing units (the energy storing unit 20 and the energy storing unit 22) have been charged in the first round. In other words, the charging time of the first round is from the beginning to the time T1. It is worth mentioning that, as can be seen from fig. 2 and 3, the charging current Iset1 provided by the power converter 11 between the time T0 and the time T1 is fixed, so that the power converter 11 is said to charge the energy storage unit 20 and the energy storage unit 22 in the constant current mode (CC mode).
Then, from time T1, the power converter 11 reduces the charging current, and instead uses the charging current Iset2 (the second charging current) to perform the second round of charging. As shown, after the power converter 11 provides the charging current Iset2, the voltage V20 across the positive and negative terminals of the energy storage unit 20 is also slightly decreased (less than the default voltage Vset). As mentioned above, since the voltage V20 is also measured by the voltage detection unit 12 outside the energy storage unit 20, it is not completely the cell voltage of the energy storage unit 20. Therefore, assuming that the cell voltage of the energy storage unit 20 is Vcap1 and the internal resistance of the energy storage unit 20 is R20, the voltage V20 can be expressed as the following equation (2):
V20＝Vcap1+I20×R20 (2)
since the charging current I20 of the energy storage cell 20 is changed from the larger charging current Iset1 (the first charging current) to the smaller charging current Iset2 (the second charging current), the voltage V20 is decreased by "(" Iset1-Iset2) × R20 ", and thus it is known that the voltage V20 is slightly decreased when the second round starts charging.
Similarly, between time T1 and time T2, the voltage V22 of the energy storage unit 22 returns to the default voltage Vset, and the voltage detection unit 15 instructs the switch control unit 16 to bypass the energy storage unit 22 by the switch 17. Also, the voltage detecting unit 15 can report to the power converter 11, which informs the voltage V22 of the energy storage unit 22 that the second round of charging has reached the default voltage Vset. As described above, when the energy storage unit 22 is bypassed by the switch 17 during the second round of charging so that the charging current I22 is zero, the voltage V22 measured by the voltage detection unit 15 is also the cell voltage Vcap2 of the energy storage unit 22. As can be seen from fig. 3, after the second round of charging is completed, the cell voltage Vcap2 of the energy storage unit 22 rises slightly. As shown in the above equation (1), since the charging current I22 of the energy storage unit 22 has only a small charging current Iset2 (second charging current) during the second round of charging, when the internal resistor R22 is unchanged, the cell voltage Vcap2 is inevitably higher than that during the first round of charging when the voltage V22 reaches the default voltage Vset. Obviously, since the power converter 11 reduces the charging current, the cell voltage Vcap2 of the energy storage unit 22 is closer to the default voltage Vset, so that the energy storage unit 22 can store more energy.
At time T2, the energy storage unit 20 reaches the default voltage Vset during the second round of charging, and the voltage detection unit 12 can also report the default voltage Vset to the power converter 11, which informs that the voltage V20 of the energy storage unit 20 reaches the default voltage Vset. Since the power converter 11 receives the reports from all the voltage detecting units (the voltage detecting unit 12 and the voltage detecting unit 15) in the first current path, it can be known that all the energy storing units (the energy storing unit 20 and the energy storing unit 22) have completed the second round of charging. In other words, the charging time of the second round is from time T1 to time T2. In an example, the power converter 11 may further adjust the charging current to be the charging current Iset3 (the third charging current) for the third round of charging, which is substantially similar to the first round of charging and the second round of charging, and thus, the present embodiment is not described herein again. As can be seen from fig. 2 and 3, although the charging currents of the power converter 11 are different between the multiple rounds of charging, the charging currents of the power converter 11 are fixed, and it can be said that the power converter 11 charges the energy storage unit 20 and the energy storage unit 22 in a constant current mode (CC mode) every round.
Of course, the charging system may perform more rounds of charging, theoretically, the cell voltage Vcap1 of the energy storage unit 20 and the cell voltage Vcap2 of the energy storage unit 22 may be closer to the default voltage Vset, and this embodiment does not limit how many rounds of charging the charging system may perform, and a person skilled in the art may design the charging system freely.
For convenience of describing the energy storage unit charging method of the present application, please refer to fig. 1 to 4 together, and fig. 4 is a flowchart illustrating steps of an energy storage unit charging method according to an embodiment of the present application. As shown in the figure, in step S400, the charging system includes an energy storage unit 20 (a first energy storage unit) and an energy storage unit 22 (a second energy storage unit), and the energy storage unit 20 and the energy storage unit 22 are connected in series in a first current path. In step S402, the charging system includes the power converter 11, and the power converter 11 charges the energy storage unit 20 and the energy storage unit 22 in the first current path with a charging current Iset1 (first charging current). In step S404, the voltage detecting unit 12 and the voltage detecting unit 15 may detect voltages of the energy storing unit 20 and the energy storing unit 22, respectively, to obtain a first voltage value corresponding to the energy storing unit 20 and a second voltage value corresponding to the energy storing unit 22. In step S406, the power converter 11 may determine whether at least one of the first voltage value and the second voltage value reaches a default voltage according to the detection results of the voltage detecting unit 12 and the voltage detecting unit 15. If the power converter 11 determines that at least one of the first voltage value and the second voltage value reaches the default voltage, assuming that the first voltage value corresponding to the energy storage unit 20 reaches the default voltage and the second voltage value corresponding to the energy storage unit 22 does not reach the default voltage, in step S408, the energy storage unit 20 whose first current path bypass reaches the default voltage is set. On the other hand, if the power converter 11 determines that both the first voltage value and the second voltage value do not reach the default voltage, the power converter 11 continues to charge the energy storage unit 20 and the energy storage unit 22 in the first current path with the charging current Iset1 (the first charging current).
Of course, the energy storage unit charging method of the application can bypass the energy storage units reaching the default voltage, and can change the charging current after the energy storage units reach the default voltage. Referring to fig. 1 to 5, fig. 5 is a flow chart illustrating steps of a method for charging an energy storage unit according to another embodiment of the present application. As in the embodiment of fig. 4, in step S500, the charging system also includes an energy storage unit 20 (a first energy storage unit) and an energy storage unit 22 (a second energy storage unit), and the energy storage unit 20 and the energy storage unit 22 are also connected in series in the first current path. In step S502, the charging system also includes the power converter 11, and the power converter 11 also charges the energy storage unit 20 and the energy storage unit 22 in the first current path with the charging current Iset1 (first charging current). In step S504, the voltage detecting unit 12 and the voltage detecting unit 15 may also detect the voltages of the energy storing unit 20 and the energy storing unit 22 respectively to obtain a first voltage value corresponding to the energy storing unit 20 and a second voltage value corresponding to the energy storing unit 22.
In a difference from the embodiment of fig. 4, in step S506, the power converter 11 may determine whether the first voltage value and the second voltage value both reach the default voltage according to the detection results of the voltage detection unit 12 and the voltage detection unit 15. If the power converter 11 determines that the first voltage value and the second voltage value both reach the default voltage, in step S508, the power converter 11 charges the energy storage unit 20 and the energy storage unit 22 in the first current path with the charging current Iset2 (the second charging current). On the other hand, if the power converter 11 determines that the first voltage value and the second voltage value do not both reach the default voltage, the power converter 11 continues to charge the energy storage unit 20 and the energy storage unit 22 in the first current path with the charging current Iset1 (the first charging current).
In summary, the energy storage unit charging method provided by the present application can determine whether each energy storage unit has been charged to the default voltage, in addition to charging a plurality of energy storage units with one power converter. And when part of the energy storage units are charged to the default voltage, bypassing the energy storage units which have reached the default voltage, and continuously charging the energy storage units which have not reached the default voltage. When all the energy storage units are charged to the default voltage, all the energy storage units are conducted, and all the energy storage units are continuously charged by using lower charging current. Therefore, the energy storage unit charging method provided by the application can have lower hardware cost and can improve the formation efficiency.
The above-described embodiments and/or implementations are only illustrative of the preferred embodiments and/or implementations for implementing the technology of the present application, and are not intended to limit the implementations of the technology of the present application in any way, and those skilled in the art can make many changes or modifications to the equivalent embodiments without departing from the scope of the technology disclosed in the present application, but should still be considered as the technology or implementations substantially the same as the present application.
Claims (7)
1. A method for charging an energy storage unit, comprising:
providing a first energy storage unit and a second energy storage unit, wherein the first energy storage unit and the second energy storage unit are connected in series in a first current path;
providing a power converter for providing a first charging current to the first current path;
respectively detecting the voltage of the first energy storage unit and the second energy storage unit so as to obtain a first voltage value and a second voltage value;
judging whether one of the first voltage value and the second voltage value reaches a default voltage; and
when the first voltage value reaches the default voltage and the second voltage value does not reach the default voltage, the first current path is set to bypass the first energy storage unit.
2. The method according to claim 1, wherein the first charging current is a constant current, and the first charging current is set to a first current value.
3. The method of charging an energy storage unit of claim 2, further comprising:
after the first current path is set to bypass the first energy storage unit, whether the second voltage value reaches the default voltage is judged;
when the second voltage value reaches the default voltage, setting the first current path to pass through the first energy storage unit and the second energy storage unit; and
when the second voltage value reaches the default voltage, the power converter is set to provide a second charging current for the first current path.
4. The method according to claim 3, wherein the second charging current is a constant current, the second charging current has a second current value, and the second current value is smaller than the first current value.
5. A method for charging an energy storage unit, comprising:
providing a first energy storage unit and a second energy storage unit, wherein the first energy storage unit and the second energy storage unit are connected in series in a first current path;
providing a power converter for providing a first charging current to the first current path;
respectively detecting the voltage of the first energy storage unit and the second energy storage unit so as to obtain a first voltage value and a second voltage value;
judging whether the first voltage value and the second voltage value both reach a default voltage; and
when the first voltage value and the second voltage value both reach the default voltage, the power converter is set to provide a second charging current for the first current path.
6. The method of claim 5, wherein the first charging current and the second charging current are constant currents, the first charging current is set to have a first current value, the second charging current is set to have a second current value, and the second current value is smaller than the first current value.
7. The method of charging an energy storage unit of claim 5, further comprising:
judging whether one of the first voltage value and the second voltage value reaches the default voltage; and
when the first voltage value reaches the default voltage and the second voltage value does not reach the default voltage, the first current path is set to bypass the first energy storage unit.
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