CN111431227A - Series-parallel switching control circuit and battery device - Google Patents
Series-parallel switching control circuit and battery device Download PDFInfo
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- CN111431227A CN111431227A CN202010225059.6A CN202010225059A CN111431227A CN 111431227 A CN111431227 A CN 111431227A CN 202010225059 A CN202010225059 A CN 202010225059A CN 111431227 A CN111431227 A CN 111431227A
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- battery
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- electrically connected
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0024—Parallel/serial switching of connection of batteries to charge or load circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
Abstract
The embodiment of the application provides a series-parallel connection switching control circuit for controlling charging and discharging of a battery pack, the battery pack comprises a first battery and a second battery, and the series-parallel connection switching control circuit comprises a processing unit and a switching unit. The processing unit is used for outputting a signal to the switching unit according to the working state of the battery pack. The switching unit is used for controlling the first battery and the second battery to be switched between a parallel connection state and a series connection state according to the signal. The embodiment of the application also provides a battery device. The series-parallel switching control circuit and the battery device provided by the embodiment of the application can realize parallel discharge of multiple battery cells and series charging of the multiple battery cells, so that the charging power is effectively improved, and the charging is actively balanced without pairing.
Description
Technical Field
The present application relates to the field of battery technologies, and in particular, to a series-parallel switching control circuit and a battery device.
Background
Batteries have the advantages of high energy density, high power density, many cycles, long storage time, etc., and are therefore widely used in daily life.
The existing quick charging technology has a single-string battery cell structure and a multi-string battery cell structure. The single-string battery cell structure has obvious advantages in space utilization rate, production process and reliability, but the multi-string battery cell structure has better low temperature rise experience and inherent advantages of higher power charging extension due to the same charging power. In the prior art, a commonly-used multi-string battery cell structure only has one loop, the reliability is not high, the balancing capability is limited and is not easy to control, the production process is complex, and the battery cells need to be paired.
Disclosure of Invention
In view of this, it is desirable to provide a series-parallel switching control circuit and a battery device, which can realize parallel discharging of multiple battery cells and series charging of multiple battery cells, effectively improve charging power, and actively balance charging without pairing.
An embodiment of the present application provides a series-parallel switching control circuit for controlling charging and discharging of a battery pack, the battery pack includes a first battery and a second battery, the series-parallel switching control circuit includes:
a processing unit and a switching unit;
the processing unit is electrically connected with the switching unit and is used for outputting a signal to the switching unit according to the working state of the battery pack; and
the switching unit is electrically connected to the first battery and the second battery, and is used for controlling the first battery and the second battery to be switched between a parallel state and a series state according to the signal.
According to some embodiments of the present application, the series-parallel switching control circuit further comprises a detection unit for detecting an operating state of the battery pack.
According to some embodiments of the application, the operating state comprises a voltage value in the first battery and the second battery, the first battery and the second battery being in a charged state or a discharged state.
According to some embodiments of the present application, when the detection unit detects that the first battery and the second battery in the discharging state are connected to the charging unit, the processing unit is configured to output a first signal to the switching unit when both the first battery and the second battery support the fast charging protocol, and the switching unit switches the first battery and the second battery in the discharging state from the parallel state to the serial state according to the first signal.
According to some embodiments of the present disclosure, when a voltage value of one of the first battery and the second battery is equal to a preset value, the processing unit outputs a second signal to the switching unit, and the switching unit switches the battery with the voltage value equal to the preset value in the first battery and the second battery to an off state according to the second signal and switches the battery with the voltage value smaller than the preset value in the first battery and the second battery to a charging state.
According to some embodiments of the present application, when the voltage values of the first battery and the second battery are equal to a preset value, the processing unit outputs a third signal to the switching unit, and the switching unit switches the first battery and the second battery in a charging state from a series connection state to a parallel connection state according to the third signal.
According to some embodiments of the present disclosure, the switching unit includes a first switch and a second switch, a first end of the first switch is electrically connected to the processing unit, a second end of the first switch is electrically connected to a negative electrode of the first battery, a third end of the first switch is electrically connected to a third end of the second switch, a first end of the second switch is electrically connected to the processing unit, and a second end of the second switch is electrically connected to a positive electrode of the second battery.
According to some embodiments of the present disclosure, the switching unit further includes a third switch and a fourth switch, a first end of the third switch is electrically connected to the processing unit, a second end of the third switch is electrically connected to the negative electrode of the first battery, a third end of the third switch is electrically connected to a third end of the fourth switch, a first end of the fourth switch is electrically connected to the processing unit, and a second end of the fourth switch is electrically connected to the negative electrode of the second battery.
According to some embodiments of the present disclosure, the switching unit includes a fifth switch and a sixth switch, a first end of the fifth switch is electrically connected to the processing unit, a second end of the fifth switch is electrically connected to the positive electrode of the first battery, a third end of the fifth switch is electrically connected to a third end of the sixth switch, a first end of the sixth switch is electrically connected to the processing unit, and a second end of the sixth switch is electrically connected to the positive electrode of the second battery.
An embodiment of the present application further provides a battery device, where the battery device includes a battery pack and the series-parallel switching control circuit as described above, and the series-parallel switching control circuit is configured to control charging and discharging of the battery pack.
According to the series-parallel switching control circuit and the battery device, the processing unit outputs signals to the switching unit according to the working state of the battery pack, and the switching unit controls the first battery and the second battery to be switched between the parallel state and the series state according to the signals. The series-parallel switching control circuit and the battery device provided by the technical scheme can realize parallel discharge of multiple battery cells and series charging of the multiple battery cells, further effectively improve charging power, and are actively balanced in charging without pairing.
Drawings
Fig. 1 is a block diagram of a battery device according to an embodiment of the present application.
Fig. 2 is a block diagram of a preferred embodiment of the series-parallel switching control circuit of fig. 1.
Fig. 3 is a circuit diagram of a preferred embodiment of the series-parallel switching control circuit in fig. 1.
Description of the main elements
Series-parallel switching control circuit 10
Switching unit 12
First switch Q1
Second switch Q2
Third switch Q3
Fourth switch Q4
Fifth switch Q5
Sixth switch Q6
The following detailed description will explain the present application in further detail in conjunction with the above-described figures.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application.
All other embodiments that can be obtained by a person skilled in the art without inventive step based on the embodiments in this application are within the scope of protection of this application.
Referring to fig. 1 and fig. 2, a battery device 100 is provided according to an embodiment of the present disclosure. The battery device 100 is electrically connectable to an external apparatus 200. The battery device 100 may include a series-parallel switching control circuit 10 and a battery pack 20.
In some embodiments of the present application, the external device 200 may be an electronic device such as a mobile phone, a POS device, a handheld barcode scanner, a handheld printer, an electronic smoking set, a remote controller, or a bluetooth headset. At this time, the battery pack 20 may supply power to the external device 200.
In some embodiments of the present application, the external device 200 may be a charging unit. At this time, the external device 200 may also charge the battery pack 20.
In one embodiment of the present application, the battery pack 20 may include a first battery 22 and a second battery 24.
The series-parallel switching control circuit 10 is electrically connected to the battery pack 20, and is configured to control charging and discharging of the battery pack 20. The battery pack 20 is electrically connected between the series-parallel switching control circuit 10 and the external device 200.
In the embodiment of the present application, the series-parallel switching control circuit 10 may include a switching unit 12 and a processing unit 14.
Specifically, the processing unit 14 is electrically connected to the switching unit 12, and the switching unit 12 is also electrically connected to the first battery 22 and the second battery 24. The processing unit 14 is configured to output a signal to the switching unit 12 according to an operating state of the battery pack 20, and the switching unit 12 is configured to control the first battery 22 and the second battery 24 to switch between a parallel connection state and a series connection state according to the signal.
In a preferred embodiment, the series-parallel switching control circuit 10 may further include a detection unit 16.
The detection unit 16 is electrically connected to the processing unit 14. The detection unit 16 is used for detecting the operating state of the battery pack 20. It is understood that the detecting unit 16 will also be used for detecting the operating status of the external device 200, such as the operating parameters of the external device, such as the voltage and current.
It is understood that, in an embodiment of the present application, the operating state of the battery pack 20 may include the first battery 22 and the second battery 24 being in a charging state or a discharging state. The operating state of the battery pack 20 may further include the first battery 22 and the second battery 24 being in a series state or a parallel state. The operating state of the battery pack 20 may also include the voltage values in the first battery 22 and the second battery 24. The operating state of the battery pack 20 may further include charging power of the first battery 22 and the second battery 24.
In some embodiments, when the detecting unit 16 detects that the first battery 22 and the second battery 24 in the discharging state are connected to the charging unit, if both the first battery 22 and the second battery 24 support the fast charging protocol, the processing unit 14 outputs a first signal to the switching unit 12. Then, the switching unit 12 switches the first battery 22 and the second battery 24 in the discharging state from the parallel state to the series state according to the first signal. Thereby, the first battery 22 and the second battery 24 will enter a series state of charge.
In some embodiments, when the voltage value of one of the first battery 22 and the second battery 24 is equal to a preset value, the processing unit 14 outputs a second signal to the switching unit 12. Then, the switching unit 12 switches the battery with the voltage value equal to the preset value in the first battery 22 and the second battery 24 to the off state according to the second signal, and switches the battery with the voltage value smaller than the preset value in the first battery 22 and the second battery 24 to the charging state. Then, when the voltage values of the first battery 22 and the second battery 24 are equal to a predetermined value, the processing unit 14 outputs a third signal to the switching unit 12. Then, the switching unit 12 switches the first battery 22 and the second battery 24 in a charging state from a series state to a parallel state according to the third signal.
Therefore, the first battery 22 and the second battery 24 can enter an active equalization mode to reduce the pressure difference, and the equalization between the first battery 22 and the second battery 24 is ensured.
Referring to fig. 3, fig. 3 is a circuit diagram of a preferred embodiment of the serial-parallel switch control circuit 10 according to the present application.
The switching unit 12 may include a first switching module 122, a second switching module 124, and a third switching module 126.
In the embodiment of the present invention, the first switch module 122 includes a first switch Q1 and a second switch Q2, a first end of the first switch Q1 is electrically connected to the processing unit 14, a second end of the first switch Q1 is electrically connected to the negative electrode B1 "of the first battery 22, a third end of the first switch Q1 is electrically connected to the third end of the second switch Q2, a first end of the second switch Q2 is electrically connected to the processing unit 14, and a second end of the second switch Q2 is electrically connected to the positive electrode B2+ of the second battery 24.
In the embodiment of the present invention, the second switch module 124 includes a third switch Q3 and a fourth switch Q4, a first end of the third switch Q3 is electrically connected to the processing unit 14, a second end of the third switch Q3 is electrically connected to the negative electrode B1 of the first battery 22, a third end of the third switch Q3 is electrically connected to the third end of the fourth switch Q4, a first end of the fourth switch Q4 is electrically connected to the processing unit 14, a second end of the fourth switch Q4 is electrically connected to the negative electrode B2 of the second battery 24, and a second end of the fourth switch Q4 is further electrically connected to the second end P-of the external device 200.
In the embodiment of the present invention, the third switch module 126 includes a fifth switch Q5 and a sixth switch Q6, a first end of the fifth switch Q5 is electrically connected to the processing unit 14, a second end of the fifth switch Q5 is electrically connected to the positive electrode B1+ of the first battery 22, a second end of the fifth switch Q5 is also electrically connected to the first end P + of the external device 200, a third end of the fifth switch Q5 is electrically connected to the third end of the sixth switch Q6, a first end of the sixth switch Q6 is electrically connected to the processing unit 14, and a second end of the sixth switch Q6 is electrically connected to the positive electrode B2+ of the second battery 24.
In the embodiments of the present application, the first switch Q1, the second switch Q2, the third switch Q3, the fourth switch Q4, the fifth switch Q5 and the sixth switch Q6 may be N-channel fets. First, second and third ends of the first, second, third, fourth, fifth and sixth switches Q1, Q2, Q3, Q4, Q5 and Q6 respectively correspond to a gate, a source and a drain of the N-channel fet.
The operation principle of the series-parallel switching control circuit 10 and the battery device 100 according to the present invention will be described below by taking the circuit diagram shown in fig. 3 as an example.
In use, when the battery pack is in an original state, that is, the battery pack 20 is in a discharge state at this time, the processing unit 14 outputs a signal to the corresponding switch to control the switches in the second switch module 124 and the third switch module 126 to be in a conducting state, and the switch in the first switch module 122 to be in a disconnecting state. Thereby, the first battery 22 and the second battery 24 are in a parallel discharge state.
Further, when the detecting unit 16 detects that the charging terminal is inserted into the external device 200 (for example, Type C is inserted), at this time, the external device 200 enters a ready-to-charge state, and sends a closed hot plug control signal to the first switch module 122, because the priority of the hot plug control signal is lower than the signal output by the processing unit in the charging state, the first switch module 122 is still in an off state at this time, and the processing unit 14 performs self-checking and battery checking at the same time, after it is confirmed that the fast-charge charging condition is met, the processing unit 14 first drives the second switch module 124 and the third switch module 126 to be switched to a unidirectional conduction state by the output signal, that is, the discharging state is conducted, then the charging voltage starts to climb, and after climbing to a preset range, the first switch module 122 is driven to close by the higher-priority hot plug control signal in the charging state and the hot plug control signal simultaneously, to enter a series charging state.
Then, when the detecting unit 16 detects that the voltage value of one of the first battery 22 and the second battery 24 is equal to the predetermined value, that is, detects that a battery (e.g., the first battery) reaches the predetermined upper charging voltage limit, the charging IC of the external device 200 will decrease the value of the charging current, and the processing unit 14 will turn off the first switch module 122 first, and the charging IC will start to decrease the charging voltage. When the voltage drops to the preset voltage value, the processing unit 14 closes the switch module on the charging loop of another battery (for example, a second battery). Then, the charging IC adjusts the charging current to enter the single-cell charging state, thereby achieving the charge equalization switching.
When the charging capacity or voltage of another battery (such as a second battery) reaches a preset value, the charging is completed, and the trickle charging state is entered. At this time, the charging IC disconnects the charging loop or adjusts the charging current, and then the processing unit 14 outputs signals to the second switching module 124 and the third switching module 126, so that the second switching module 124 and the third switching module 126 are in one-way conduction to implement parallel waiting for discharging. It is understood that the battery and the battery cell can be two or more strings, so that charging with higher power is realized, and discharging equalization is not needed.
When the charging of the first battery 22 and the second battery 24 is completed, the battery pack 20 is in a parallel connection waiting for discharging. When the charger is disconnected from charging, the battery pack 20 enters a discharged state.
In the embodiment of the application, when hot plug occurs, the electric core is not short-circuited and the host machine can not be powered off. Specifically, the first switch module 122 is controlled by multiple logics, and the multiple logics are designed by priority and misoperation. The hot plug control signal is from the external device 200, and is used to turn on and off the first switch module 122. The priority of the hot plug control conduction driving is lower than that of the control signal of the series-parallel switching control circuit 10, so that the short circuit of the battery cell is prevented. However, when the battery pack is charged, the driving priority of the hot swap control disconnection of the charge random disconnection is higher than the control signal of the serial-parallel switching control circuit 10, at this time, the power supplied by the external device 200 may automatically follow the current through the diodes in the second switch module 124 and the third switch module 126 as a temporary power supply path, and then the discharge logic of the serial-parallel switching control circuit is switched to the normal power supply state, thereby achieving the effect of hot swap without power outage.
Obviously, the series-parallel switching control circuit 10 and the battery device 100 provided in the technical scheme of the present application can implement parallel discharge of multiple battery cells and series charging of multiple battery cells, so as to effectively increase charging power, and the charging is actively balanced without pairing.
It will be evident to those skilled in the art that the present application is not limited to the details of the foregoing illustrative embodiments, and that the present application may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The embodiments described above are therefore to be considered in all respects as illustrative and not restrictive.
Claims (10)
1. The utility model provides a series-parallel connection switching control circuit for control battery pack's charge-discharge, the battery pack includes first battery and second battery, its characterized in that, series-parallel connection switching control circuit includes:
a processing unit and a switching unit;
the processing unit is electrically connected with the switching unit and is used for outputting a signal to the switching unit according to the working state of the battery pack; and
the switching unit is electrically connected to the first battery and the second battery, and is used for controlling the first battery and the second battery to be switched between a parallel state and a series state according to the signal.
2. The series-parallel switching control circuit according to claim 1, further comprising a detection unit for detecting an operation state of the battery pack.
3. The series-parallel switching control circuit according to claim 2, wherein the operating state includes a state in which the first battery and the second battery are charged or discharged, and a voltage value in the first battery and the second battery.
4. The series-parallel switching control circuit according to claim 3, wherein when the detection unit detects that the first battery and the second battery in the discharging state are connected to the charging unit, the processing unit is configured to output a first signal to the switching unit when both the first battery and the second battery support a fast charging protocol, and the switching unit switches the first battery and the second battery in the discharging state from the parallel state to the series state according to the first signal.
5. The series-parallel switching control circuit according to claim 4, wherein when the voltage value of one of the first battery and the second battery is equal to a predetermined value, the processing unit outputs a second signal to the switching unit, and the switching unit switches the battery with the voltage value equal to the predetermined value among the first battery and the second battery to an off state and switches the battery with the voltage value smaller than the predetermined value among the first battery and the second battery to a charging state according to the second signal.
6. The series-parallel switching control circuit according to claim 5, wherein the processing unit outputs a third signal to the switching unit when the voltage values of the first battery and the second battery are equal to a preset value, and the switching unit switches the first battery and the second battery in a charged state from a series state to a parallel state according to the third signal.
7. The series-parallel switching control circuit according to claim 1, wherein the switching unit includes a first switch and a second switch, a first end of the first switch is electrically connected to the processing unit, a second end of the first switch is electrically connected to a negative electrode of the first battery, a third end of the first switch is electrically connected to a third end of the second switch, a first end of the second switch is electrically connected to the processing unit, and a second end of the second switch is electrically connected to a positive electrode of the second battery.
8. The series-parallel switching control circuit according to claim 7, wherein the switching unit further comprises a third switch and a fourth switch, a first end of the third switch is electrically connected to the processing unit, a second end of the third switch is electrically connected to the negative electrode of the first battery, a third end of the third switch is electrically connected to a third end of the fourth switch, a first end of the fourth switch is electrically connected to the processing unit, and a second end of the fourth switch is electrically connected to the negative electrode of the second battery.
9. The series-parallel switching control circuit according to claim 8, wherein the switching unit includes a fifth switch and a sixth switch, a first terminal of the fifth switch is electrically connected to the processing unit, a second terminal of the fifth switch is electrically connected to the anode of the first battery, a third terminal of the fifth switch is electrically connected to a third terminal of the sixth switch, a first terminal of the sixth switch is electrically connected to the processing unit, and a second terminal of the sixth switch is electrically connected to the anode of the second battery.
10. A battery device comprising a battery pack and the series-parallel switching control circuit according to any one of claims 1 to 9, the series-parallel switching control circuit being configured to control charging and discharging of the battery pack.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010225059.6A CN111431227B (en) | 2020-03-26 | 2020-03-26 | Series-parallel switching control circuit and battery device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010225059.6A CN111431227B (en) | 2020-03-26 | 2020-03-26 | Series-parallel switching control circuit and battery device |
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| CN111431227A true CN111431227A (en) | 2020-07-17 |
| CN111431227B CN111431227B (en) | 2022-03-18 |
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| CN112886684A (en) * | 2021-03-25 | 2021-06-01 | 深圳市迪浦电子有限公司 | Multi-lithium battery charging and discharging management circuit and system |
| CN113725974A (en) * | 2021-09-02 | 2021-11-30 | 中国科学技术大学先进技术研究院 | Dynamic series-parallel connection circuit and method for batteries |
| WO2022069277A1 (en) * | 2020-10-02 | 2022-04-07 | Renault S.A.S | Dynamic system for balancing charging voltage for battery modules |
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