CN112583082A - Charging and discharging circuit and charging and discharging system with same - Google Patents
Charging and discharging circuit and charging and discharging system with same Download PDFInfo
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- CN112583082A CN112583082A CN202011534222.3A CN202011534222A CN112583082A CN 112583082 A CN112583082 A CN 112583082A CN 202011534222 A CN202011534222 A CN 202011534222A CN 112583082 A CN112583082 A CN 112583082A
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- switching device
- charge
- discharge
- charging
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
Abstract
The invention provides a charge-discharge circuit and a charge-discharge system with the same, wherein the charge-discharge circuit comprises: the first switch device, the second switch device, the third switch device, the fourth switch device, the first external interface, the second external interface, the first charge-discharge interface and the second charge-discharge interface; the first port of the first switch device, the first port of the second switch device and the first charge-discharge interface are electrically connected; the second port of the first switching device, the first port of the third switching device and the first external interface are electrically connected; the second port of the second switching device, the first port of the fourth switching device and the second external interface are electrically connected; the second port of the third switching device, the second port of the fourth switching device and the second charge and discharge interface are electrically connected. The charge and discharge circuit is capable of performing charge and discharge operations.
Description
Technical Field
The invention relates to the technical field of power storage, in particular to a charging and discharging circuit and a charging and discharging system with the same.
Background
The battery is one of the most important components of the electric automobile, and it has long been a problem how to prolong the service life of the electric automobile, and in practice for many years, engineers find that the reason for the problem is the imbalance of the batteries in series and parallel connection. In order to avoid the deterioration of the imbalance trend, it is necessary to increase the charging voltage of the battery pack and charge the batteries in a balanced manner, so as to balance the characteristics of each battery cell in the battery pack and prolong the service life of the batteries.
Equalizing charging is that when the single voltage of the power battery reaches or exceeds the cut-off voltage in the middle and later stages of the charging process of the power battery, an equalizing circuit starts to work, the single current of the power battery is reduced, and the single voltage of the power battery is limited to be not higher than the charging cut-off voltage. The only function of the equalizing charge is to prevent overcharging, which would have a negative effect in discharging use. When the equalizing charge is used, the small-capacity power battery monomer is not overcharged, and the electric quantity capable of being discharged is smaller than the electric energy capable of being released by slight overcharge without an equalizer, so that the power battery monomer is shorter in discharge time, and higher in possibility of overdischarge.
In summary, designing a balanced charging and discharging circuit becomes a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a charge-discharge circuit and a charge-discharge system with the same.
In order to achieve one of the above objects, according to an embodiment of the present invention, there is provided a charge and discharge circuit including: the first switch device, the second switch device, the third switch device, the fourth switch device, the first external interface, the second external interface, the first charge-discharge interface and the second charge-discharge interface; the first port of the first switch device, the first port of the second switch device and the first charge-discharge interface are electrically connected; the second port of the first switching device, the first port of the third switching device and the first external interface are electrically connected; the second port of the second switching device, the first port of the fourth switching device and the second external interface are electrically connected; the second port of the third switching device, the second port of the fourth switching device and the second charge and discharge interface are electrically connected.
As a further improvement of an embodiment of the present invention, the first, second, third and fourth switching devices are all P-channel triodes.
As a further improvement of an embodiment of the present invention, the first, second, third and fourth switching devices are MOS transistors.
As a further improvement of an embodiment of the present invention, the first, second, third and fourth switching devices are all IGBT devices.
As a further improvement of one embodiment of the invention, the operating frequency of the P-channel triode is 50Hz or 60 Hz.
As a further improvement of an embodiment of the present invention, the present invention further includes: and the control device controls the first switching device and the fourth switching device to be in a connected state and controls the second switching device and the third switching device to be in a disconnected state when detecting that the charging and discharging circuit is in a positive half period.
As a further improvement of an embodiment of the present invention, the control device controls the first switching device and the fourth switching device to be in an off state, and controls the second switching device and the third switching device to be in a connected state when the control device detects that the charge and discharge circuit is in the negative half cycle.
As a further improvement of an embodiment of the present invention, the control device controls both the third switching device and the fourth switching device to be in the connected state and both the first switching device and the second switching device to be in the disconnected state when receiving the bypass instruction.
An embodiment of the present invention further provides a charging and discharging system, including: a plurality of the charge and discharge circuits are connected in series; each charging and discharging circuit is provided with a rechargeable battery device, wherein a first charging and discharging interface is electrically connected to the positive pole of the rechargeable battery device, and a second charging and discharging interface is electrically connected to the negative pole of the rechargeable battery device; in the two charge and discharge circuits which are connected in series, a first external interface in one charge and discharge circuit is connected in series with a second external interface in the other charge and discharge circuit.
Compared with the prior art, the invention has the technical effects that: the embodiment of the invention provides a charge-discharge circuit and a charge-discharge system with the same, wherein the charge-discharge circuit comprises: the first switch device, the second switch device, the third switch device, the fourth switch device, the first external interface, the second external interface, the first charge-discharge interface and the second charge-discharge interface; the first port of the first switch device, the first port of the second switch device and the first charge-discharge interface are electrically connected; the second port of the first switching device, the first port of the third switching device and the first external interface are electrically connected; the second port of the second switching device, the first port of the fourth switching device and the second external interface are electrically connected; the second port of the third switching device, the second port of the fourth switching device and the second charge and discharge interface are electrically connected. The charge and discharge circuit is capable of performing charge and discharge operations.
Drawings
Fig. 1A, 1B, 1C, and 1D are structural diagrams of a charge and discharge circuit;
fig. 2 is a structural view of the charge/discharge system in this embodiment.
Detailed Description
The present invention will be described in detail below with reference to embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
Terms such as "upper," "above," "lower," "below," and the like, used herein to denote relative spatial positions, are used for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. The spatially relative positional terms may be intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the other elements or features. Thus, the exemplary term "below" can encompass both an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
An embodiment of the present invention provides a charging and discharging circuit, as shown in fig. 1A, 1B, and 1C, including:
a first switching device Q1, a second switching device Q2, a third switching device Q3, a fourth switching device Q4, a first external interface 21, a second external interface 22, a first charge-discharge interface 11, and a second charge-discharge interface 12;
here, the first and second charge-discharge interfaces are used for connecting the rechargeable battery device 1, the rechargeable battery device 1 may be a plurality of rechargeable batteries or rechargeable cells connected in series, and the rechargeable batteries may be lead-acid batteries, nickel-cadmium batteries, nickel-metal hydride batteries, lithium polymer batteries, and the like. The first and second external interfaces may be used for connecting external devices, for example, when the rechargeable battery device 1 needs to be charged, the first and second external interfaces may be connected to an ac/dc transformer, and the ac/dc transformer may be connected to a power supply network to convert ac power on the power supply network into dc power, and then charge the rechargeable battery device 1; when the rechargeable battery device 1 is required to provide power for the outside, the first and second external interfaces can be connected with the electric equipment. Here, the first, second, third and fourth switching devices have two terminals which are electrically connected when the switching devices are closed and are electrically disconnected when the switching devices are opened; the switch device may be an electronic switch (e.g., various transistors), or a mechanical switch.
The first port of the first switching device Q1, the first port of the second switching device Q2 and the first charge-discharge interface 11 are electrically connected; the second port of the first switching device Q1, the first port of the third switching device Q3, and the first external interface 21 are electrically connected; the second port of the second switching device Q2, the first port of the fourth switching device Q4 and the second external interface 22 are electrically connected; the second port of the third switching device Q3, the second port of the fourth switching device Q4, and the second charge and discharge interface 12 are electrically connected.
Here, it is assumed that the second charge/discharge interface 12 is connected to the negative electrode of the rechargeable battery device 1, and the first charge/discharge interface 11 is connected to the positive electrode of the rechargeable battery device 1.
As shown in fig. 1B, when in the positive half-cycle, the first switching device Q1 and the fourth switching device Q4 are controlled to be connected, the second switching device Q2 and the third switching device Q3 are controlled to be disconnected, and current flows in from the second external interface 22, then flows through the fourth switching device Q4, then flows through the negative electrode of the rechargeable battery device 1, then flows out from the positive electrode of the rechargeable battery device 1, then flows through the first switching device Q1, and then flows out from the first external interface 21.
As shown in fig. 1C, when in the negative half cycle, the first switching device Q1 and the fourth switching device Q4 are controlled to be open, the second switching device Q2 and the third switching device Q3 are connected, and current flows in from the first external interface 21, then flows through the third switching device Q3, then flows through the negative electrode of the rechargeable battery device 1, then flows out from the positive electrode of the rechargeable battery device 1, and then flows through the second switching device Q3, and then flows out from the second external interface 22.
As shown in fig. 1D, in actual use, a plurality of charging and discharging circuits are generally used in series, but when a certain rechargeable battery device 1 needs to be bypassed, the third switching device Q3 and the fourth switching device Q4 may be connected, the first switching device Q1 and the second switching device Q2 may be disconnected, and thus, current flows in from the second external interface 22, then flows through the fourth switching device Q4, then flows through the third switching device Q3, and then flows out from the first external interface 21.
Here, it can be understood that, when it is necessary to charge the battery, as long as the first switching device Q1 and the fourth switching device Q4 are controlled to be turned off, the second switching device Q2 and the third switching device Q3 are connected, and current flows from the first external interface 21 and flows from the second external interface 22.
In summary, the charging and discharging circuit can charge, discharge and bypass the rechargeable battery device 1. In the long-term work of the inventor, the inventor finds that the balance of large current can be realized between the first and second charge-discharge interfaces during charge and discharge, the sorting of the batteries in the rechargeable battery device 1 is easier, the requirement on battery consistency is low, and the rechargeable battery device can be matched with different batteries in the same system.
In this embodiment, the first, second, third and fourth switching devices are all P-channel triodes. Here, for the first, second, third and fourth switching devices, any one of the source and the drain may be a first port, the remaining one of the source and the drain may be located at a second port, and the gate may control conduction or disconnection between the source and the drain.
In this embodiment, the first, second, third and fourth switching devices are all MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) transistors.
In this embodiment, the first, second, third and fourth switching devices are all IGBT (Insulated Gate Bipolar Transistor) devices.
In this embodiment, the operating frequency of the P-channel triode is 50Hz or 60 Hz. Here, when the operating frequency of the P-channel transistor is 50Hz or 60Hz, switching loss can be reduced, no output LC filtering is performed, the conversion efficiency of the device is improved, and the cost is reduced.
In this embodiment, the method further includes: and a control device for controlling the first switching device Q1 and the fourth switching device Q4 to be in a connected state and the second switching device Q2 and the third switching device Q3 to be in an disconnected state when the charging and discharging circuit is detected to be in a positive half cycle.
In this embodiment, when the control device detects that the charging and discharging circuit is in the negative half-cycle, the control device controls the first switching device Q1 and the fourth switching device Q4 to be in the off state, and controls the second switching device Q2 and the third switching device Q3 to be in the connected state.
In the present embodiment, the control device controls the third switching device Q3 and the fourth switching device Q4 to be in the connected state and the first switching device Q1 and the second switching device Q2 to be in the disconnected state when receiving the bypass command.
An embodiment of the present invention provides a charging and discharging system, as shown in fig. 2, including: in the charging and discharging circuits of the first embodiment, the charging and discharging circuits are connected in series; each charging and discharging circuit is provided with a rechargeable battery device 1, wherein a first charging and discharging interface 11 is electrically connected to the positive pole of the rechargeable battery device 1, and a second charging and discharging interface 12 is electrically connected to the negative pole of the rechargeable battery device 1; in the two charge and discharge circuits connected in series, the first external interface 21 of one charge and discharge circuit is connected in series with the second external interface 22 of the other charge and discharge circuit.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (9)
1. A charging and discharging circuit, comprising:
a first switching device (Q1), a second switching device (Q2), a third switching device (Q3), a fourth switching device (Q4), a first external interface (21), a second external interface (22), a first charge-discharge interface (11), and a second charge-discharge interface (12);
the first port of the first switching device (Q1), the first port of the second switching device (Q2) and the first charge-discharge interface (11) are electrically connected;
the second port of the first switching device (Q1), the first port of the third switching device (Q3) and the first external interface (21) are electrically connected;
the second port of the second switching device (Q2), the first port of the fourth switching device (Q4) and the second external interface (22) are electrically connected;
the second port of the third switching device (Q3), the second port of the fourth switching device (Q4), and the second charge-discharge interface (12) are electrically connected.
2. The charge and discharge circuit according to claim 1, wherein:
the first, second, third and fourth switching devices are all P-channel triodes.
3. The charge and discharge circuit according to claim 1, wherein:
the first, second, third and fourth switching devices are all MOS tubes.
4. The charge and discharge circuit according to claim 1, wherein:
the first, second, third and fourth switching devices are all IGBT devices.
5. The charge and discharge circuit according to claim 2, wherein:
the working frequency of the P-channel triode is 50Hz or 60 Hz.
6. The charging and discharging circuit according to claim 1, further comprising:
a control device for controlling the first switching device (Q1) and the fourth switching device (Q4) to be in a connected state and the second switching device (Q2) and the third switching device (Q3) to be in an disconnected state when the charging and discharging circuit is detected to be in a positive half cycle.
7. The charge and discharge circuit according to claim 6, wherein:
the control device controls the first switching device (Q1) and the fourth switching device (Q4) to be in an open state, and controls the second switching device (Q2) and the third switching device (Q3) to be in a connected state when the charging and discharging circuit is detected to be in a negative half-cycle.
8. The charge and discharge circuit according to claim 6, wherein:
the control device controls the third switching device (Q3) and the fourth switching device (Q4) to be in a connected state and the first switching device (Q1) and the second switching device (Q2) to be in an disconnected state when receiving a bypass command.
9. A charging and discharging system, comprising:
a plurality of charge and discharge circuits according to any of claims 1 to 8, the plurality of charge and discharge circuits being connected in series;
each charging and discharging circuit is provided with a rechargeable battery device (1), wherein a first charging and discharging interface (11) is electrically connected to the positive pole of the rechargeable battery device (1), and a second charging and discharging interface (12) is electrically connected to the negative pole of the rechargeable battery device (1);
in the two charge and discharge circuits which are connected in series, a first external interface (21) in one charge and discharge circuit is connected in series with a second external interface (22) in the other charge and discharge circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011534222.3A CN112583082A (en) | 2020-12-23 | 2020-12-23 | Charging and discharging circuit and charging and discharging system with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011534222.3A CN112583082A (en) | 2020-12-23 | 2020-12-23 | Charging and discharging circuit and charging and discharging system with same |
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| CN112583082A true CN112583082A (en) | 2021-03-30 |
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| CN202011534222.3A Pending CN112583082A (en) | 2020-12-23 | 2020-12-23 | Charging and discharging circuit and charging and discharging system with same |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013089296A (en) * | 2011-10-13 | 2013-05-13 | Nippon Soken Inc | Temperature rise controller of battery pack |
| CN103647310A (en) * | 2013-11-20 | 2014-03-19 | 上海交通大学 | Method of achieving in-phase SOC balance for MMC battery energy storage system by increasing and decreasing modules |
| CN105356731A (en) * | 2015-12-24 | 2016-02-24 | 国家电网公司 | Submodule triggering methods for high-voltage direct-current transmission system of modular multilevel converter |
| CN105429495A (en) * | 2015-12-10 | 2016-03-23 | 西南交通大学 | Modular multilevel converter using multi-state submodule |
| CN110061626A (en) * | 2019-04-04 | 2019-07-26 | 全球能源互联网研究院有限公司 | A kind of charging station with high voltage dc bus |
-
2020
- 2020-12-23 CN CN202011534222.3A patent/CN112583082A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2013089296A (en) * | 2011-10-13 | 2013-05-13 | Nippon Soken Inc | Temperature rise controller of battery pack |
| CN103647310A (en) * | 2013-11-20 | 2014-03-19 | 上海交通大学 | Method of achieving in-phase SOC balance for MMC battery energy storage system by increasing and decreasing modules |
| CN105429495A (en) * | 2015-12-10 | 2016-03-23 | 西南交通大学 | Modular multilevel converter using multi-state submodule |
| CN105356731A (en) * | 2015-12-24 | 2016-02-24 | 国家电网公司 | Submodule triggering methods for high-voltage direct-current transmission system of modular multilevel converter |
| CN110061626A (en) * | 2019-04-04 | 2019-07-26 | 全球能源互联网研究院有限公司 | A kind of charging station with high voltage dc bus |
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Address after: 226100 No.888, Jiuhua Road, high tech Zone, Nantong City, Jiangsu Province Applicant after: Wotai Energy Co.,Ltd. Address before: 226100 No.888, Jiuhua Road, high tech Zone, Nantong City, Jiangsu Province Applicant before: NEOVOLTAIC ENERGY NANTONG Co.,Ltd. |
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Application publication date: 20210330 |