CN101877424A - Charging and discharging method and system for battery pack - Google Patents
Charging and discharging method and system for battery pack Download PDFInfo
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- CN101877424A CN101877424A CN2009100571613A CN200910057161A CN101877424A CN 101877424 A CN101877424 A CN 101877424A CN 2009100571613 A CN2009100571613 A CN 2009100571613A CN 200910057161 A CN200910057161 A CN 200910057161A CN 101877424 A CN101877424 A CN 101877424A
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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 invention relates to a power supply technology of terminal equipment, and discloses a charging and discharging method and a charging and discharging system of a battery pack, which can prolong the service life of a battery unit in the battery pack. In the invention, when discharging, each battery unit in the battery pack is discharged one by one instead of being discharged together; during charging, the used battery units are charged one by one, and one battery unit is charged and then the next battery unit is charged.
Description
Technical Field
The invention relates to a power supply technology of terminal equipment, in particular to a charging and discharging technology of a battery pack.
Background
A conventional battery refers to a portion of the space of a cup, tank, or other container or composite container that holds an electrolyte solution and metal electrodes to generate an electric current. With the advancement of technology, batteries generally refer to small devices that can generate electrical energy. To date, batteries are becoming more and more numerous and more widely available, such as zinc-manganese batteries (zinc and manganese dioxide), zinc-mercury batteries (zinc and mercury oxide), lithium batteries, cadmium-nickel, iron-nickel, zinc-silver, zinc-air, and lithium-iron sulfide, and lead-acid batteries, among others. In order to increase the service life of the battery and provide more energy, a battery pack concept is further proposed.
The battery components are connected in series and in parallel, the parallel battery pack requires that the voltage of each battery is the same, the output voltage is equal to the voltage of one battery, and the parallel battery pack can provide stronger current. The series battery pack has no excessive requirement, and only needs to ensure that the capacity of the battery is almost the same. The series battery can provide a higher voltage. The battery pack has wide application in our lives, such as increasing power supply for each terminal device in a communication system.
However, the life of the battery pack is limited, and the use time of the battery pack is continuously reduced due to the number and time of repeated use. That is, the battery pack can be repeatedly used through charge and discharge processes, but the total number of uses is limited. Currently, a battery pack is formed by connecting a plurality of battery cells in series and parallel, and all the battery cells are discharged at the same time when discharging and all the battery cells are charged at the same time when charging.
However, the inventor of the present invention has found that some types of batteries (e.g., nickel-metal hydride batteries) have memory effect, and require charging after the battery capacity is exhausted, which may result in a reduction in battery capacity. There are also some types of batteries (e.g., lithium ion batteries) where the total number of charges over the life of the battery is substantially fixed. Therefore, if the mode of simultaneous discharging and charging is adopted, certain batteries in the battery pack begin to be charged when the discharging is not finished, the service life of the battery pack is shortened, and inconvenience is brought to a user in charging opportunity.
Disclosure of Invention
The invention aims to provide a charging and discharging method and a charging and discharging system of a battery pack, which can prolong the service life of a battery unit in the battery pack.
In order to solve the above technical problem, an embodiment of the present invention provides a method for charging and discharging a battery pack, including:
during discharging, the battery units in the battery pack are discharged one by one, and after the electric quantity of one battery unit is discharged, the next battery unit is switched to continue discharging;
in the charging, only the battery cells that have discharged their electric energy are charged.
An embodiment of the present invention also provides a charge and discharge system of a battery pack, including:
a battery pack comprising at least 2 battery cells;
the charging circuit is used for charging each battery unit in the battery pack;
a discharge circuit for discharging each battery cell in the battery pack;
the control module is used for controlling the charging and discharging process of the battery pack;
during discharging, the control module controls each battery unit in the battery pack to discharge one by one, and after the electric quantity of one battery unit is discharged, the next battery unit is connected to the discharging circuit to discharge;
when charging, the control module controls the charging circuit to charge each battery unit with discharged electric quantity.
Compared with the prior art, the implementation mode of the invention has the main differences and the effects that:
when discharging, each battery unit in the battery pack is discharged one by one instead of being discharged together; in the charging, only the battery cells that have discharged their electric energy are charged. Therefore, each battery unit can be charged after the electric quantity is used up, and for a battery with certain maximum charging times, more electricity throughput can be realized in the whole life period; for the battery with memory effect, the capacity of the battery can be ensured not to be reduced.
Further, in the charging process, the used battery units are charged one by one, and the battery units are charged one by one and then charged. Therefore, when charging every time, only one battery can be influenced even if the charging is incomplete, and the overall charging quality of the battery pack is ensured.
Further, when discharging, discharging in sequence according to the charging sequence; during charging, the charging is carried out according to the discharging sequence. Therefore, the freshness of each battery unit in the whole battery pack can be basically consistent. Alternatively, after a cell is discharged, the next discharged cell is randomly selected from the available batteries, and the freshness of each cell in the entire battery pack can be substantially the same.
Drawings
Fig. 1 is a flowchart of a charging method of a battery pack according to a first embodiment of the present invention;
fig. 2 is a schematic view of a charge and discharge method of a battery pack according to a first embodiment of the present invention;
fig. 3 is a flowchart of a discharging method of a battery pack according to a first embodiment of the present invention.
Detailed Description
In the following description, numerous technical details are set forth in order to provide a better understanding of the present application. However, it will be understood by those of ordinary skill in the art that the claimed embodiments of the present invention may be practiced without these specific details and with various changes and modifications based on the following embodiments.
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
A first embodiment of the present invention relates to a method of charging and discharging a battery pack. The method of discharging the battery pack is shown in fig. 1.
In step 110, the battery pack is discharged from one battery cell in the battery pack at the current time while discharging. Specifically, an electronic switch may be provided between each battery cell in the battery pack and the charging circuit or the discharging circuit, and each battery cell may be connected to or disconnected from the charging circuit or the discharging circuit by controlling each electronic switch, as shown in fig. 2. Of course, the connection or disconnection of each battery cell to or from the charging circuit or the discharging circuit may be controlled in other manners. In this step, an available battery unit is connected to the discharge circuit through the control of the electronic switch, so that the discharge of one battery unit in the battery pack at the current moment is realized.
Next, in step 120, it is determined whether the currently discharged battery unit has discharged the power. If the discharge is finished, step 130 is entered; and if the discharge is not finished, the battery unit continues to discharge until the electric quantity of the battery unit is discharged. Specifically, the monitored voltage or discharge current may be compared to a predetermined first threshold by monitoring the voltage or discharge current of the battery cell. If the power is lower than the first threshold, the power of the battery unit is considered to be discharged; if the first threshold is higher than or equal to the first threshold, the battery unit is considered to have not discharged the power. In addition to monitoring the voltage, it may also be determined whether the electric quantity of one battery unit is discharged in other various manners, and the determination of whether the electric quantity of one battery unit is discharged by monitoring the voltage in this embodiment is only an example of a specific implementation.
In step 130, a switch is made to the next cell. Specifically, one of the remaining available battery cells is selected, the selected battery cell is connected to the discharge circuit, and the used-up battery cell is disconnected from the discharge circuit. Thereafter, returning to step 110, the discharge of the battery is continued by the switched battery.
The method of charging the battery pack in the present embodiment is shown in fig. 3.
In step 310, a battery cell is selected from the discharged battery cells for charging. Specifically, the selected battery cell is connected to the charging circuit by controlling the switch, and the battery cell is charged.
Next, in step 320, it is determined whether the currently charged battery cell has been charged. Specifically, the voltage of the currently charged battery cell may be monitored and the monitored voltage may be compared with a predetermined second threshold in a similar manner to the method of determining whether the discharge is finished. If the voltage is higher than the second predetermined threshold, the charging of the battery unit is considered to be completed, the charging process of the battery unit is ended, and the step 310 is returned to, and a battery unit is selected from the battery units with discharged power for charging. If the monitored voltage is less than or equal to the predetermined second threshold, the cell is considered to be not charged, and charging is continued until the charging process of the cell is completed.
When charging, the used battery units are charged one by one, and one battery unit is charged and then the next battery unit is charged. Therefore, when charging every time, only one battery can be influenced even if the charging is not complete, the overall charging quality of the battery pack is ensured, and the realization of application is facilitated.
In the present embodiment, the battery cells that have discharged their amounts of electricity are charged one by one. However, in other embodiments, other charging methods may be used, such as charging each battery cell with discharged power at the same time, so that the total charging time is shorter.
It is not difficult to find that, in the present embodiment, the battery cells in the battery pack are discharged one by one, rather than all together, when discharged. In the charging, only the battery cells that have discharged their electric energy are charged. Therefore, each battery unit can be charged after the electricity is used up, and for a battery with a certain maximum charging number, the service life of the battery can be prolonged to a greater extent. For the battery with memory effect, the capacity of the battery can be ensured not to be reduced.
A second embodiment of the present invention relates to a method of charging and discharging a battery pack. The second embodiment is improved on the basis of the first embodiment, and the main improvement lies in that: during discharging, the discharging is performed in sequence according to the charging sequence of each battery unit in the battery pack, and the battery unit which is charged first discharges first.
During charging, the battery units with discharged electric quantity are charged one by one in the following way: and sequentially charging according to the discharging sequence of each battery unit, wherein the battery unit which is discharged first is charged first.
That is, in the present embodiment, on the basis of the first embodiment, how to select the currently discharged battery cell and how to select the currently charged battery cell are further defined, so that the battery cells are discharged in sequence of the charging during the discharging; during charging, the charging is carried out in sequence according to the discharging sequence.
Specifically, how to know which cell is the earliest charged or discharged, there are several implementations, and 2 examples are briefly listed below:
the method comprises the following steps: a cycle sequence can be set for each battery unit, such as serial numbering, and a pointer can be set, wherein the pointer points to the currently discharged battery unit. After the current cell is used up, the next charged cell is the earliest in order. During charging, the first dead cell is the earliest discharged, moving in sequence from the hand position downwards.
For example, there are five battery cells, numbered sequentially 1, 2, 3, 4, 5, forming a cyclic sequence of 1, 2, 3, 4, 5, 1, 2, 3. Currently, pointing to battery cell number 2, half is used, battery cells number 5 and 1 are dead, and battery cells number 3 and 4 are charged. During discharging, when the No. 2 battery unit is used up, the next battery unit is No. 3, and the No. 3 battery unit is the earliest to be charged and should use No. 3. During charging, the 5 th battery cell is the earliest discharged, and the 5 th battery cell should be charged first.
The second method comprises the following steps: an array is provided to record the most recent charge completion time for each charged cell and the most recent discharge completion time for each discharged cell. The array is queried to know which cell is the earliest charged or discharged.
Of course, various other methods of determining which cell is the earliest to be charged or discharged are possible and are not illustrated here.
In the present embodiment, the discharge is performed in order of the charge. During charging, the charging is carried out according to the discharging sequence. Therefore, the freshness of each battery unit in the whole battery pack can be basically consistent.
A third embodiment of the present invention relates to a method of charging and discharging a battery pack. The third embodiment is an improvement on the first embodiment, and the main improvement lies in that: during discharging, after the electric quantity of one battery unit is discharged, randomly selecting the next discharged battery unit from the available battery units in the battery pack; in charging, the next battery unit to be charged is selected from the dead battery units in a random manner.
It is to be understood that, in both the present embodiment and the second embodiment, based on the first embodiment, how to select the currently discharged battery cell and how to select the currently charged battery cell are further limited. However, the selection method of the present embodiment is different from that of the second embodiment in which discharging/charging is performed sequentially in accordance with the order of charging/discharging; in the present embodiment, the next cell to be discharged/charged is selected randomly. Although the selection method is different, the present embodiment can also make the freshness of each battery cell in the whole battery pack substantially uniform.
In addition, it is understood that, in addition to the selection of the next discharged battery unit by random selection or according to the sequence of discharging of each battery unit, other manners of discharging each battery unit in the battery pack one by one may be possible. The next discharged battery unit is selected randomly or according to the discharging sequence of each battery unit, which is only two specific implementation schemes for realizing the invention.
Method embodiments of the present invention may be implemented in software, hardware, firmware, etc. Whether implemented in software, hardware, or firmware, the instruction code may be stored in any type of computer-accessible memory (e.g., permanent or modifiable, volatile or non-volatile, solid or non-solid, fixed or removable, etc.). Also, the Memory may be, for example, programmable Array Logic (PAL), random Access Memory (RAM), programmable Read Only Memory (PROM), read-Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), a magnetic disk, an optical disk, a Digital Versatile Disk (DVD), and so on.
A fourth embodiment of the present invention relates to a charge and discharge system of a battery pack. The charge and discharge system of the battery pack includes:
a battery pack comprising at least 2 battery cells.
And the charging circuit is used for charging each battery unit in the battery pack.
And a discharge circuit for discharging each battery cell in the battery pack.
And the control module is used for controlling the charging and discharging process of the battery pack.
When discharging, the control module controls each battery unit in the battery pack to discharge one by one, and after the electric quantity of one battery unit is discharged, the next battery unit is connected to the discharging circuit to discharge.
When charging, the control module controls the charging circuit to charge each battery unit with discharged electric quantity.
In this embodiment, the control module controls the charging circuit to charge each battery cell, of which the amount of electricity has been discharged, one by one. The control module comprises a judging submodule for judging whether the electric quantity of one battery unit is discharged.
Specifically, the judgment submodule compares the voltage or the discharge current of the currently discharged battery unit with a preset first threshold, and if the voltage or the discharge current of the currently discharged battery unit is smaller than the preset first threshold, the judgment submodule judges that the electric quantity of the battery unit is discharged.
The determining submodule is further configured to determine whether a charging process of a battery cell has been completed. Specifically, the determining submodule compares the voltage of the currently discharged battery cell with a preset second threshold, and determines that the charging process of the battery cell is completed if the voltage of the currently discharged battery cell is greater than the preset second threshold.
It is to be understood that the first embodiment is a method embodiment corresponding to the present embodiment, and the present embodiment can be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment.
A fifth embodiment of the present invention relates to a charge/discharge system of a battery pack. The fifth embodiment is an improvement on the fourth embodiment, and the main improvement lies in that: the control module sequentially accesses the battery units into the discharge circuit according to the charging sequence of the battery units in the battery pack, and the battery unit which is charged first is accessed into the discharge circuit first. And the control module controls the charging circuit to charge each battery unit with discharged electric quantity one by one in the following way:
and sequentially connecting the battery units into the charging circuit according to the discharging sequence of the battery units, wherein the battery unit which is discharged first is connected into the charging circuit first.
It is to be understood that the second embodiment is a method embodiment corresponding to the present embodiment, and the present embodiment can be implemented in cooperation with the second embodiment. The related technical details mentioned in the second embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the second embodiment.
A sixth embodiment of the present invention relates to a charge/discharge system for a battery pack. The sixth embodiment is an improvement on the fourth embodiment, and the main improvement lies in that: the control module selects the next battery unit connected to the discharge circuit for discharging in the following way:
among the battery cells available in the battery pack, the next discharged battery cell is randomly selected.
And the control module charges each battery unit with discharged electric quantity by the following method:
and selecting one battery unit from the dead battery units in a random mode, and connecting the selected battery unit into a charging circuit for charging.
It is to be understood that the third embodiment is a method embodiment corresponding to the present embodiment, and the present embodiment can be implemented in cooperation with the third embodiment. The related technical details mentioned in the third embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related technical details mentioned in the present embodiment can also be applied to the third embodiment.
It should be noted that, all units mentioned in the embodiments of the apparatus of the present invention are logical units, and physically, a logical unit may be a physical unit, or a part of a physical unit, or may be implemented by a combination of multiple physical units, where the physical implementation manner of the logical unit itself is not the most important, and the combination of functions implemented by the logical unit is a key for solving the technical problem provided by the present invention. In addition, in order to highlight the innovative part of the present invention, the above-mentioned embodiments of the apparatus of the present invention do not introduce elements that are not so closely related to solve the technical problems proposed by the present invention, which does not indicate that there are no other elements in the above-mentioned embodiments of the apparatus.
While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (10)
1. A method for charging and discharging a battery pack, comprising the steps of:
when discharging, the battery units in the battery pack discharge one by one, and the next battery unit is switched to continue discharging after the electric quantity of one battery unit is discharged;
in the charging, only the battery cells that have discharged their electric energy are charged.
2. The battery pack charging and discharging method according to claim 1, wherein the charging step includes the substeps of:
and charging the battery units with discharged electric quantity one by one.
3. The battery pack charging and discharging method according to claim 2, wherein the discharging step includes the substeps of:
discharging in sequence according to the charging sequence of each battery unit in the battery pack, wherein the battery unit charged first discharges first;
in the step of charging, the battery units with discharged electric quantity are charged one by one in the following way:
and sequentially charging according to the discharging sequence of the battery units, wherein the battery unit which is discharged first is charged first.
4. The battery pack charging and discharging method according to claim 2, wherein the discharging step includes the substeps of:
after the electric quantity of one battery unit is discharged, randomly selecting the next discharged battery unit from the available battery units in the battery pack;
in the step of charging, the following substeps are included:
one battery cell is selected from the dead battery cells in a random manner for charging.
5. The method for charging and discharging the battery pack according to any one of claims 1 to 4, wherein the step of switching to the next battery cell for continuing discharging after the charge of one battery cell is discharged comprises the following sub-steps:
and comparing the voltage or the discharge current of the currently discharged battery unit with a preset threshold, if the voltage or the discharge current of the currently discharged battery unit is smaller than the preset threshold, judging that the electric quantity of the battery unit is discharged completely, and switching to the next battery unit to continue discharging.
6. A charge and discharge system for a battery pack, comprising:
a battery pack comprising at least 2 battery cells;
a charging circuit for charging each battery cell in the battery pack;
a discharge circuit for discharging each battery cell in the battery pack;
the control module is used for controlling the charging and discharging process of the battery pack;
when discharging, the control module controls each battery unit in the battery pack to discharge one by one, and after the electric quantity of one battery unit is discharged, the next battery unit is connected to the discharge circuit to discharge;
when charging, the control module controls the charging circuit to charge each battery unit with discharged electric quantity.
7. The battery pack charging and discharging system according to claim 6, wherein the control module controls the charging circuit to charge each of the discharged battery cells one by one.
8. The battery pack charging and discharging system according to claim 7, wherein the control module sequentially connects the battery units to the discharging circuit according to the charging sequence of the battery units in the battery pack, and the battery unit which is charged first is connected to the discharging circuit first;
the control module controls the charging circuit to charge each battery unit with discharged electric quantity one by one in the following modes:
and sequentially connecting the battery units into a charging circuit according to the discharging sequence of the battery units, wherein the battery unit which is discharged first is connected into the charging circuit first.
9. The battery pack charging and discharging system according to claim 7, wherein the control module selects the next cell to be connected to the discharging circuit for discharging by:
randomly selecting a next discharged battery cell among the battery cells available in the battery pack;
the control module charges each battery unit with discharged electric quantity in the following way:
and selecting one battery unit from the dead battery units in a random mode, and connecting the selected battery unit into a charging circuit for charging.
10. The charge and discharge system for the battery pack according to any one of claims 6 to 9, wherein the control module includes a determination submodule for determining whether the charge of one battery cell is discharged;
and the judging submodule compares the voltage or the discharge current of the currently discharged battery unit with a preset threshold, and if the voltage or the discharge current of the currently discharged battery unit is smaller than the preset threshold, the judgment submodule judges that the electric quantity of the battery unit is discharged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009100571613A CN101877424A (en) | 2009-04-30 | 2009-04-30 | Charging and discharging method and system for battery pack |
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| CN2009100571613A CN101877424A (en) | 2009-04-30 | 2009-04-30 | Charging and discharging method and system for battery pack |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953198A (en) * | 2014-03-26 | 2015-09-30 | 苏州宝时得电动工具有限公司 | Control method of battery pack group, battery pack group and electric tool |
| CN106329641A (en) * | 2016-09-09 | 2017-01-11 | 苏州精控能源科技有限公司 | Parallel connection battery pack charging, discharging control method and power battery system |
| WO2017148111A1 (en) * | 2016-03-04 | 2017-09-08 | 中兴通讯股份有限公司 | Charging method and charging device |
| CN107431368A (en) * | 2015-03-09 | 2017-12-01 | Fdk株式会社 | Accumulating system |
| CN107757375A (en) * | 2017-11-26 | 2018-03-06 | 安徽星凯龙客车有限公司 | A kind of double-battery charge electric discharge handover control system and method |
-
2009
- 2009-04-30 CN CN2009100571613A patent/CN101877424A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104953198A (en) * | 2014-03-26 | 2015-09-30 | 苏州宝时得电动工具有限公司 | Control method of battery pack group, battery pack group and electric tool |
| CN107431368A (en) * | 2015-03-09 | 2017-12-01 | Fdk株式会社 | Accumulating system |
| CN107431368B (en) * | 2015-03-09 | 2020-07-07 | Fdk株式会社 | Electricity storage system |
| WO2017148111A1 (en) * | 2016-03-04 | 2017-09-08 | 中兴通讯股份有限公司 | Charging method and charging device |
| CN106329641A (en) * | 2016-09-09 | 2017-01-11 | 苏州精控能源科技有限公司 | Parallel connection battery pack charging, discharging control method and power battery system |
| CN107757375A (en) * | 2017-11-26 | 2018-03-06 | 安徽星凯龙客车有限公司 | A kind of double-battery charge electric discharge handover control system and method |
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