CN113675926B - Charging and discharging circuit, charging and discharging method and terminal - Google Patents
Charging and discharging circuit, charging and discharging method and terminal Download PDFInfo
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- CN113675926B CN113675926B CN202111007844.5A CN202111007844A CN113675926B CN 113675926 B CN113675926 B CN 113675926B CN 202111007844 A CN202111007844 A CN 202111007844A CN 113675926 B CN113675926 B CN 113675926B
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000007600 charging Methods 0.000 title claims description 206
- 238000007599 discharging Methods 0.000 title claims description 55
- 239000003990 capacitor Substances 0.000 claims description 52
- 238000001514 detection method Methods 0.000 claims description 26
- 238000013507 mapping Methods 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 description 11
- 230000002093 peripheral effect Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 238000010277 constant-current charging Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 101710096660 Probable acetoacetate decarboxylase 2 Proteins 0.000 description 1
- 101100434411 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) ADH1 gene Proteins 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 101150102866 adc1 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010280 constant potential charging Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
- H02J7/00045—Authentication, i.e. circuits for checking compatibility between one component, e.g. a battery or a battery charger, and another component, e.g. a power source
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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
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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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
- H02J7/0025—Sequential battery discharge in systems with a plurality of batteries
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The application belongs to the technical field of charge and discharge, and provides a charge and discharge circuit, a charge and discharge method and a terminal.
Description
Technical Field
The application belongs to the technical field of charge and discharge, and particularly relates to a charge and discharge circuit, a charge and discharge method and a terminal.
Background
With the development of the fast charging technology, the mobile phone and the tablet have been charged with more than 60W. Because the charging power is larger, the prior single cell architecture needs to meet such a large charging current, and huge heating on the wire and board level can be brought, so that bad experience is brought to users. In view of this, the current mainstream practice is to use a serial battery, which changes the battery voltage to 2 times that of a single battery, and the current is 1/2 of the original current at the same charging power, so that the heat generation amount of the charging path is reduced to 1/4 of that of the single battery under the same condition.
However, since the currents on the paths of the series-connected batteries are equal, when the impedances of the two batteries are not identical, there are cases where one battery is charged or discharged and the other battery is not yet completed, resulting in a case where the use time becomes short and the charge is never full in use by the user.
Disclosure of Invention
The application aims to provide a charge and discharge circuit, a charge and discharge method and a terminal, and aims to solve the problem that a battery module cannot be fully charged due to inconsistent cell impedance.
A first aspect of an embodiment of the present application provides a charge-discharge circuit, including:
the acquisition module is used for acquiring battery parameters of the battery module; the battery module comprises a plurality of battery cells which are sequentially connected in series, and the battery parameters at least comprise the electric quantity of the battery module and the voltage of each battery cell;
The charging module is used for selecting a corresponding charging mode according to the battery parameters to charge the battery module; the charging mode comprises a switched capacitor charging mode and a Boost charging mode;
and the equalization module is used for determining a cell to be equalized according to the battery parameters when the battery module is charged and cut off, and sequentially carrying out equalization charging on the cell to be equalized.
In one embodiment, the charge-discharge circuit further includes:
the discharging module is used for selecting a corresponding discharging mode to discharge the battery module according to the battery parameters; the discharging modes comprise a switch capacitor discharging mode and a Buck discharging mode.
In one embodiment, the charge-discharge circuit further includes:
The adapter identification module is used for acquiring parameters of an adapter connected to the charging module, and if the parameters of the adapter are preset adapter parameters, the charging module is controlled to establish communication connection with the adapter so as to identify a charging protocol between the charging module and the adapter.
In one embodiment, the charging module includes:
The Boost charging unit is used for charging the battery module in the Boost charging mode when the electric quantity of the battery module is smaller than a first threshold electric quantity or the electric quantity of the battery module is larger than a second threshold electric quantity;
And the switch capacitor charging unit is used for charging the battery module in the switch capacitor charging mode when the electric quantity of the battery module is between the first threshold electric quantity and the second threshold electric quantity.
In one embodiment, the equalization module includes:
The switch units are connected with the battery cores in parallel one by one and are used for sequentially connecting the battery cores to be balanced into the balanced charging loop so as to perform balanced charging on the battery cores to be balanced.
The second aspect of the embodiment of the present application further provides a charging and discharging method, which is applied to the charging and discharging circuit described in any one of the embodiments, where the charging and discharging method includes:
Acquiring battery parameters of a battery module; the battery module comprises a plurality of battery cells which are sequentially connected in series, and the battery parameters at least comprise the electric quantity of the battery module and the voltage of each battery cell;
Selecting a corresponding charging mode according to the battery parameters to charge the battery module; the charging mode comprises a switched capacitor charging mode and a Boost charging mode;
and determining a battery cell to be balanced according to the battery parameters when the battery module is charged and cut off, and sequentially carrying out balanced charging on the battery cell to be balanced.
In one embodiment, the charge and discharge method further includes:
And replacing the battery core by using a reference step power supply, and establishing a mapping relation between the detection voltage output by the acquisition module and the voltage of the reference step power supply so as to calibrate the actual voltage of the battery module.
In one embodiment, the selecting the corresponding charging mode according to the battery parameter to charge the battery module includes:
when the electric quantity of the battery module is smaller than a first threshold electric quantity or the electric quantity of the battery module is larger than a second threshold electric quantity, charging the battery module in the Boost charging mode;
And when the electric quantity of the battery module is between the first threshold electric quantity and the second threshold electric quantity, charging the battery module in the switched capacitor charging mode.
In one embodiment, the sequentially equalizing charge of the cells to be equalized includes:
and based on a plurality of switch units, the battery cells to be balanced are sequentially connected into an equalizing charge loop so as to perform equalizing charge on the battery cells to be balanced, wherein the switch units are connected with the battery cells in parallel one by one.
A third aspect of the embodiment of the present application further provides a terminal, where the terminal includes a charge-discharge circuit according to any one of the foregoing embodiments.
The embodiment of the application provides a charge-discharge circuit, a charge-discharge method and a terminal, wherein battery parameters of a battery module are acquired through an acquisition module, then the battery module is charged by a charging module according to the battery parameters, the charging mode comprises a switched capacitor charging mode and a Boost charging mode, after the charging is stopped, a battery cell to be balanced in the battery module is determined through the battery parameters when the charging of the balancing module is stopped, and the battery cell to be balanced is sequentially subjected to balanced charging, so that the problem that the battery module cannot be fully charged due to inconsistent impedance of the battery cell is solved.
Drawings
Fig. 1 is a schematic circuit diagram of a charge-discharge circuit according to an embodiment of the present application;
fig. 2 is a schematic circuit diagram of another charge-discharge circuit according to an embodiment of the present application;
fig. 3 is a schematic circuit diagram of a switched capacitor charging chip according to an embodiment of the present application;
fig. 4 is a schematic circuit diagram of an equalization module according to an embodiment of the present application;
fig. 5 is a schematic flow chart of a charge-discharge method according to an embodiment of the present application;
fig. 6 is a schematic flow chart of step S21 in the charge-discharge method according to the embodiment of the present application;
fig. 7 is a schematic flow chart of another charge-discharge method according to an embodiment of the present application;
fig. 8 is a schematic flow chart of another charge-discharge method according to an embodiment of the present application;
fig. 9 is a schematic flow chart of another charge-discharge method according to an embodiment of the present application;
fig. 10 is a schematic flow chart of another charge-discharge method according to an embodiment of the present application;
Fig. 11 is a schematic flow chart of another charge-discharge method according to an embodiment of the present application.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The original single cell architecture is required to meet such a large charging current, so that huge heating on wires and board levels is brought, and bad experience is brought to users. In view of this, the current mainstream practice is to use a serial battery, which changes the battery voltage to 2 times that of a single battery, and the current is 1/2 of the original current at the same charging power, so that the heat generation amount of the charging path is reduced to 1/4 of that of the single battery under the same condition. And since the currents on the paths of the series cells are equal. When the impedances of the two batteries are inconsistent, there are situations that one battery is charged or discharged and the other battery is not, so that the use time is shortened and the charging is never full in use.
In order to solve the above technical problems, an embodiment of the present application provides a charge-discharge circuit, as shown in fig. 1, which includes an acquisition module 40, a charging module 20, and an equalization module 30.
Specifically, the charge-discharge circuit is applied to the battery module 10, the battery module 10 includes a plurality of cells connected in series in sequence, the obtaining module 40 is configured to obtain a battery parameter of the battery module 10, the battery parameter at least includes an electric quantity of the battery module 10 and a voltage of each cell, the charging module 20 selects a corresponding charging mode according to the battery parameter to charge the battery module 10, the charging mode includes a switched capacitor charging mode and a Boost charging mode, in a specific application, the switched capacitor charging mode and the Boost charging mode may respectively correspond to a high current charging and a low current charging, the switched capacitor charging mode and the Boost charging mode may respectively be performed by two paths of charging circuits, for example, the switched capacitor charging mode may be performed by a charging circuit composed of a switched capacitor charging chip and a peripheral circuit thereof, and the Boost charging mode may be performed by a charging circuit composed of a Boost chip and a peripheral circuit thereof.
In this embodiment, the acquiring module 40 is configured to acquire the battery parameters of the battery module 10, where the battery parameters of the battery module 10 may be sent to the acquiring module 40 by the battery management system, or may be generated after the detection circuit or the detection module detects the battery module 10 and then sent to the acquiring module 40, the detection module may be integrated in the acquiring module 40, and the equalization module 30 determines the battery cells to be equalized according to the battery parameters when the battery module 10 is charged and stops, and sequentially performs equalizing charge on the battery cells to be equalized. Specifically, the main control module may determine an underfilled battery cell according to a battery parameter (for example, a voltage of each battery cell) of the battery module 10 at the end of charging, for example, a theoretical standard full voltage of the battery cell is 4.4V, the detecting module detects the parameter of the battery cell, if the voltage of the battery cell obtained by the obtaining module 40 is less than 4.4V, which indicates that the battery cell is underfilled, the main control module marks the battery cell as a battery cell to be balanced, the balancing module 30 accesses the battery cell into the balanced charging circuit, and small current (for example, in a Boost charging mode) is used for carrying out balanced charging on the battery cell.
In one embodiment, referring to fig. 2, the charge-discharge circuit further includes a discharge module 50, where the discharge module 50 is configured to select a corresponding discharge mode according to the battery parameters to discharge the battery module 10; the discharging modes comprise a switch capacitor discharging mode and a Buck discharging mode.
In a specific application, the switch capacitor discharging mode and the Buck discharging mode may respectively correspond to a large current discharging and a small current discharging, the switch capacitor discharging mode and the Buck discharging mode may respectively perform a discharging process on the battery module 10 by two paths of discharging circuits, for example, the switch capacitor discharging mode may perform the discharging process on the battery module 10 by a discharging circuit composed of a switch capacitor charging chip and its peripheral circuit, and the Buck discharging mode may perform the discharging process on the battery module 10 by a discharging circuit composed of a Buck chip and its peripheral circuit.
In one embodiment, the battery discharging circuit may be composed of a switched capacitor converter discharging circuit for discharging the battery module 10 in the switched capacitor discharging mode and a BUCK discharging circuit for discharging the battery module 10 in the BUCK discharging mode.
In the embodiment, the efficiency of the switched capacitor converter circuit is over 98%, the efficiency is high, and the loss is small. However, since the chip architecture is an open loop architecture, when the battery module 10 is in a low-power state, the change of the output voltage of the switch capacitor quick charger chip directly reacts on the change of the input voltage, and may trigger the under-voltage protection of the battery, so when the battery module 10 is in a low-voltage state, the charging and discharging circuit switches the power supply to the BUCK discharging circuit for power supply, and the efficiency of the BUCK circuit is lower, but the output voltage can be stably output when the battery is in a low-voltage state, and the risk of triggering the battery protection is avoided.
In one embodiment, referring to FIG. 2, the charge and discharge circuit further includes an adapter identification module 60. In this embodiment, the adapter identifying module 60 is configured to obtain parameters of an adapter connected to the charging module 20, and if the parameters of the adapter are preset adapter parameters, control the charging module 20 to establish a communication connection with the adapter so as to identify a charging protocol between the charging module 20 and the adapter.
In one embodiment, referring to fig. 2, the charging module 20 includes a Boost charging unit 21, a switched capacitor charging unit 22.
The Boost charging unit 21 charges the battery module 10 in the Boost charging mode when the electric quantity of the battery module 10 is less than the first threshold electric quantity or the electric quantity of the battery module 10 is greater than the second threshold electric quantity.
In this embodiment, the Boost charging unit may be a Boost charging circuit formed by a Boost chip and a peripheral circuit thereof, and may be switched to the charging channel to charge the battery module 10 during battery precharge and constant voltage charging, so that the Boost charging circuit may be used to better manage the charging state of the battery, thereby preventing battery protection due to abnormal charging. In addition, as the BOOST charging circuit is provided with the battery path management circuit, after the chip (such as a power management chip, a BOOST chip and the like) is charged and cut off, the MOS tube between the battery module 10 and the charging junction of the chip is disconnected, and in the light load mode, the electricity of the system is provided by the SYS network, and at the moment, the charging module does not charge and discharge the battery any more, so that a reliable scene is provided for the subsequent battery equalization processing process.
The switched capacitor charging unit 22 is configured to charge the battery module 10 in a switched capacitor charging mode when the electric quantity of the battery module 10 is between the first threshold electric quantity and the second threshold electric quantity.
In this embodiment, the switched capacitor charging unit may be a charging circuit composed of a switched capacitor charging chip (such as BQ2597 x) and its peripheral circuit, where the switched capacitor charging chip has a characteristic of high charging efficiency, and the charging efficiency of the switched capacitor charging chip may be up to more than 98%, and is particularly suitable for the current high-current fast charging scenario.
In one embodiment, referring to fig. 2, the charging and discharging circuit further includes a charging switch 70, where the charging switch 70 is configured to switch the Boost charging unit and the switched capacitor charging unit according to a switching instruction sent by the main control module to charge the battery module 10.
Fig. 3 is a schematic diagram of a switched capacitor charging chip, and in combination with fig. 5, when the switching tube G1 and the switching tube G3 are turned on, and the switching tube G2 and the switching tube G4 are turned off, V in＝VCFLY+VOUT,IIN＝ICFLY＝IOUT;CIN is a voltage across the input capacitor, V CFLY is a voltage across the capacitor CFLY, and C OUT is an output capacitor; v CFLY＝VOUT,ICFLY＝IOUT when the switching tube G1 and the switching tube G3 are disconnected and the switching tube G2 and the switching tube G4 are conducted; thus, V OUT＝(1/2)*Vin,IOUT＝2*IIN.
Therefore, according to the voltage-current conversion characteristics, the output voltage is 1/2 of the input voltage, the output current is 2 times of the input current, and if the input voltage is 17.6V and the input current is 3.25A, the output voltage is 8.8V and the output current is 6.5A. Since the output current of the switched capacitor charging unit is large, the switched capacitor charging mode is only used when the battery is charged with constant current, for example, when the electric quantity of the battery module 10 is between the first threshold electric quantity and the second threshold electric quantity, the switched capacitor charging unit rapidly charges the battery module 10.
In a specific application, the first threshold electric quantity in the above embodiment may be 20% Q, and the second threshold electric quantity may be 80% Q or 90% Q, where Q is the capacity of the battery module 10.
In one embodiment, the equalization module 30 includes a plurality of switch units connected in parallel with the plurality of battery cells one by one, and configured to sequentially connect the battery cells to be equalized to the equalization charging loop, so as to perform equalization charging on the battery cells to be equalized.
In this embodiment, the multiple switch units are connected in parallel with the battery cells one by one, and the multiple switch units are turned on or turned off according to the received switch control signals, so that the battery cells to be balanced are connected into the balanced charging loop, and balanced charging is performed on the battery cells to be balanced.
In a specific application, the switch units may be composed of switch devices such as a switch tube and a relay, each switch unit is used as a bypass switch to be turned on and off according to a switch control signal sent by the main control module, if the switch unit is turned on, the corresponding battery cell of the switch unit is shorted, if the switch unit is turned off, the corresponding battery cell of the switch unit is connected to the equalizing charge loop.
Referring to fig. 4, a battery equalization circuit is composed of three switching transistors and two resistors. When the battery charge is cut off, the two detection pins (pins ADC1 and ADC 2) of the acquisition module respectively detect voltages of the first battery cell 11 and the second battery cell 12, and in theory, the voltages of the battery cells in the full state are all 4.4V. When the voltage of the first battery cell 11 is lower than 4.4V, the first switch tube Q1 is turned on, at this time, the charging switch between the SYS pin of the charging chip and the battery module 10 is turned on, the charging current flows through the first battery cell 11, the first switch tube Q1 and the second resistor R2, and the charging current is charged within 100mA due to the current limiting of the second resistor R2, and after the first battery cell 11 is fully charged, the first switch tube Q1 is turned off, and the battery equalization is completed. When the voltage of the second battery core 12 is detected to be lower than 4.4V, the second switching tube Q2 and the third switching tube Q3 are opened, a charging switch between the SYS pin of the charging chip and the battery module 10 is turned on, charging current flows through the third switching tube Q3, the first resistor R1 and the second battery core 12, the charging current is charged within 100mA due to the fact that the current of the first resistor R1 is limited, and after the second battery core 12 is full, the second switching tube Q2 and the third switching tube Q3 are turned off, and the equalizing charging process of the battery module 10 is completed.
In a specific application, the first switching tube Q1 and the second switching tube Q2 may be NMOS tubes, and the third switching tube Q3 may be PMOS tubes. The grid electrodes of the first switching tube Q1, the second switching tube Q2 and the third switching tube Q3 are connected with the main control module.
The main control module determines the battery cells to be balanced according to the battery cell voltage output by the acquisition module, and sends corresponding switch control signals to the balancing module 30 to control the on and off of the plurality of switch units, so that the battery cells to be balanced are connected into the balanced charging loop to perform balanced charging on the battery cells to be balanced.
The embodiment of the application also provides a charging and discharging method, which is applied to the charging and discharging circuit in any one of the embodiments, and is shown in fig. 5, and the charging and discharging method comprises a step S10, a step S20 and a step S30.
In step S10, obtaining battery parameters of the battery module; the battery module comprises a plurality of battery cells which are sequentially connected in series, and the battery parameters at least comprise the electric quantity of the battery module and the voltage of each battery cell.
In step S20, a corresponding charging mode is selected according to the battery parameters to charge the battery module; the charging modes comprise a switched capacitor charging mode and a Boost charging mode.
In step S30, when the battery module is charged and cut-off, the battery cells to be balanced are determined according to the battery parameters, and the battery cells to be balanced are sequentially charged in an equalizing manner.
In one embodiment, referring to fig. 6, in step S20, the battery module is charged by selecting a corresponding charging mode according to the battery parameters, including step S21 and step S22.
In step S21, when the electric quantity of the battery module is smaller than the first threshold electric quantity or the electric quantity of the battery module is larger than the second threshold electric quantity, the battery module is charged in the Boost charging mode.
In step S22, when the electric quantity of the battery module is between the first threshold electric quantity and the second threshold electric quantity, the battery module is charged in the switched capacitor charging mode.
In one embodiment, referring to fig. 7, the charge and discharge method further includes step S60.
In step S60, parameters of an adapter connected to the charging module are obtained, and if the parameters of the adapter are preset adapter parameters, the charging module is controlled to establish communication connection with the adapter so as to identify a charging protocol between the charging module and the adapter.
In one application scenario, as shown in fig. 8, the above charge and discharge method may be implemented by the following steps S61, S62, S63, S64, S65, S66, S67, S68.
S61: and inserting an adapter, and acquiring parameters of the adapter by the charging module, wherein the parameters of the adapter comprise the output voltage of the adapter.
S62: and recognizing the voltage input by the adapter, starting the Boost charging unit to charge the battery module, and performing BC 1.2 protocol recognition.
BC1.2 (Battery CHARGING V1.2.2) is a protocol established by the BC (Battery Charging) group under USB-IF, primarily for standardizing Battery charging requirements, which was originally implemented based on the USB2.0 protocol. The USB2.0 protocol specifies that the peripheral draws a maximum of 500ma of current from the USB charger, and the current limit of 500ma cannot meet the ever-increasing fast-charge demand. Therefore, BC1.2 introduces a charging port identification mechanism, mainly comprising several USB port types: standard Downstream Port (SDP), dedicated Charging Port (DCP), charging Downstream Port (CDP).
The SDP port supports the USB protocol, and the maximum current is 500mA, so that the SDP can be considered as a common USB interface; the DCP does not support a data protocol, supports quick charging, can provide large current, and is mainly used for special chargers such as wall charging and the like; CDP supports both data protocols and fast charging.
S63: if the BC 1.2 protocol fails to identify, the adapter accessed by the charging module is judged to be a non-standard adapter, and the Boost charging unit is used for carrying out low-current charging on the battery module.
S64: if the BC 1.2 protocol is successfully identified, the charging module is controlled to establish communication connection with the adapter so as to identify a quick charging protocol between the charging module and the adapter.
S65: if the fast charging protocol is successfully identified, whether the electric quantity of the battery module meets the constant current charging condition is judged, for example, when the electric quantity of the battery module is between the first threshold electric quantity and the second threshold electric quantity, the constant current charging condition is met, and the switch capacitor charging unit is used for fast charging the battery module.
S65: if the constant current charging condition is not satisfied, the BC 1.2 mode is maintained to charge the battery module.
S66: if the constant current charging condition is met, the switch capacitor charging unit is started to charge the battery module in a switch capacitor charging mode.
S66: and if the electric quantity of the battery module reaches the second threshold electric quantity, switching to the Boost charging unit to charge the battery module in a Boost charging mode.
In one embodiment, see fig. 9, the charge-discharge method further comprises step S40.
In step S40, a corresponding discharging mode is selected according to the battery parameters to discharge the battery module; the discharging modes comprise a switch capacitor discharging mode and a Buck discharging mode.
In one application scenario, as shown in fig. 10, the above charge and discharge method may be implemented by the following steps S81, S82, S83, S84, S85.
S81: and starting the power-on device, accessing the electric equipment into the battery module, supplying power by default by using the BUCK discharging circuit, and acquiring the initial voltage of the battery module.
S82: it is determined whether the initial voltage of the battery module is higher than a first threshold voltage (e.g., 3.6V).
S83: if not, the BUCK discharging circuit is continuously used for supplying power.
S84: if yes, the switch capacitor discharging circuit is started to supply power.
S85: when the battery module discharges to the voltage smaller than the first threshold voltage, the BUCK discharging circuit is switched to supply power.
In one embodiment, referring to fig. 11, the charge and discharge method further includes step S50.
In step S50, the reference step power source is used to replace the battery cell, and a mapping relationship between the detection voltage output by the acquisition module and the voltage of the reference step power source is established, so as to calibrate the actual voltage of the battery module.
In this embodiment, since the voltage dividing circuit formed by the voltage dividing resistors is used by the detection module to divide the voltage of the battery cell and then perform voltage acquisition, in order to avoid detection errors in the voltage dividing detection process, the battery cell in the battery module is simulated by using two reference step power supplies, and the voltage acquired by the acquisition module from the detection module is calibrated, for example, a mapping relationship between the detection voltage output by the acquisition module and the voltage of the reference step power supply is established, and the actual voltage of the battery cell is determined from the mapping relationship table by the detection voltage output by the acquisition module, so that the purpose of calibrating the actual voltage of the battery cell is achieved.
When the voltage detection process of the first battery cell is calibrated, a reference stepping power supply simulating the first battery cell is set to be a preset stepping voltage (for example, the stepping voltage is set to be 0.1V), the detection module adopts two resistor voltage division to reduce the first battery cell in equal proportion, the main control module reads the detection voltage output by the acquisition module, a mapping relation table between the detection voltage and the voltage of the reference stepping power supply is established, and in practical application, when the main control module acquires the detection voltage value of the first battery cell output by the acquisition module, the actual voltage of the first battery cell is determined according to the detection voltage value of the first battery cell and the mapping relation table, so that the occurrence of abnormity of equalizing charge caused by detection errors is avoided.
When the voltage detection process of the second battery cell is calibrated, a reference stepping power supply simulating the second battery cell is set to be a preset stepping voltage (for example, the stepping voltage is set to be 0.1V), the second battery cell is reduced in an equal proportion by adopting two resistor voltage division modes through the acquisition module, the main control module reads the detection voltage output by the acquisition module, a mapping relation table between the detection voltage and the voltage of the reference stepping power supply is established, and in practical application, when the main control module acquires the detection voltage value of the second battery cell output by the acquisition module, the practical voltage of the second battery cell is determined according to the detection voltage value of the second battery cell and the mapping relation table, so that the occurrence of abnormity of equalizing charge caused by detection errors is avoided.
After the calibration is finished, the reference battery cell is inserted into the battery module, the acquisition module detects whether the detected voltage values of the reference battery cell and the reference battery cell are consistent with the mapping relation table, and if not, the calibration step S50 is executed again.
In one embodiment, the sequentially equalizing charge of the cells to be equalized includes: and based on a plurality of switch units, the battery cells to be balanced are sequentially connected into an equalizing charge loop so as to perform equalizing charge on the battery cells to be balanced, wherein the switch units are connected with the battery cells in parallel one by one.
For brevity of description, the specific working processes of the steps S10, S20, S30, S40, S50, and S60 described above may be described with reference to the working principles of the charge-discharge circuit in fig. 1 to 4, which are not repeated here.
The embodiment of the application also provides a terminal, which comprises the charge-discharge circuit according to any one of the embodiments.
The embodiment of the application provides a charge-discharge circuit, a charge-discharge method and a terminal, wherein battery parameters of a battery module are acquired through an acquisition module, then the battery module is charged by a charging module according to the battery parameters, the charging mode comprises a switched capacitor charging mode and a Boost charging mode, after the charging is stopped, a battery cell to be balanced in the battery module is determined through the battery parameters when the charging of the balancing module is stopped, and the battery cell to be balanced is sequentially subjected to balanced charging, so that the problem that the battery module cannot be fully charged due to inconsistent impedance of the battery cell is solved.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, the specific names of the functional units and modules are only for distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (6)
1. A charge-discharge circuit, characterized in that the charge-discharge circuit comprises:
the acquisition module is used for acquiring battery parameters of the battery module; the battery module comprises a plurality of battery cells which are sequentially connected in series, and the battery parameters at least comprise the electric quantity of the battery module and the voltage of each battery cell;
The charging module is used for selecting a corresponding charging mode according to the battery parameters to charge the battery module; the charging mode comprises a switched capacitor charging mode and a Boost charging mode;
the equalization module is used for determining a battery cell to be equalized according to the battery parameters when the battery module is charged and cut off, and sequentially carrying out equalization charging on the battery cell to be equalized;
The switch capacitor charging mode and the Boost charging mode are respectively implemented by two paths of charging circuits to charge the battery module; the main control module marks the underfilled battery cells as the battery cells to be balanced according to the battery parameters of the battery module when the charging is finished, the battery cells to be balanced are connected into an equalization loop by the equalization module, and the Boost charging mode is adopted to charge the battery cells to be balanced;
The equalization module includes:
The switch units are connected with the battery cores in parallel one by one and are used for sequentially connecting the battery cores to be balanced into an equalizing charge loop so as to perform equalizing charge on the battery cores to be balanced; each switch unit is used as a bypass switch to be switched on and off according to a switch control signal sent by the main control module, if the switch unit is switched on, the corresponding battery cell of the switch unit is shorted, and if the switch unit is switched off, the corresponding battery cell of the switch unit is connected into the equalizing charge loop;
the charging module includes:
The Boost charging unit is used for charging the battery module in the Boost charging mode when the electric quantity of the battery module is smaller than a first threshold electric quantity or the electric quantity of the battery module is larger than a second threshold electric quantity;
And the switch capacitor charging unit is used for charging the battery module in the switch capacitor charging mode when the electric quantity of the battery module is between the first threshold electric quantity and the second threshold electric quantity.
2. The charge-discharge circuit of claim 1, wherein the charge-discharge circuit further comprises:
the discharging module is used for selecting a corresponding discharging mode to discharge the battery module according to the battery parameters; the discharging modes comprise a switch capacitor discharging mode and a Buck discharging mode.
3. The charge-discharge circuit of claim 1, wherein the charge-discharge circuit further comprises:
The adapter identification module is used for acquiring parameters of an adapter connected to the charging module, and if the parameters of the adapter are preset adapter parameters, the charging module is controlled to establish communication connection with the adapter so as to identify a charging protocol between the charging module and the adapter.
4. A charge-discharge method, characterized in that it is applied to the charge-discharge circuit according to any one of claims 1 to 3, comprising:
Acquiring battery parameters of a battery module; the battery module comprises a plurality of battery cells which are sequentially connected in series, and the battery parameters at least comprise the electric quantity of the battery module and the voltage of each battery cell;
Selecting a corresponding charging mode according to the battery parameters to charge the battery module; the charging mode comprises a switched capacitor charging mode and a Boost charging mode;
Determining a battery cell to be balanced according to the battery parameters when the battery module is charged and cut off, and sequentially carrying out balanced charging on the battery cell to be balanced;
And sequentially carrying out equalizing charge on the battery cells to be equalized, wherein the equalizing charge comprises the following steps: based on a plurality of switch units, the battery cells to be balanced are sequentially connected into an equalizing charge loop so as to perform equalizing charge on the battery cells to be balanced; the selecting a corresponding charging mode according to the battery parameters to charge the battery module includes:
when the electric quantity of the battery module is smaller than a first threshold electric quantity or the electric quantity of the battery module is larger than a second threshold electric quantity, charging the battery module in the Boost charging mode;
And when the electric quantity of the battery module is between the first threshold electric quantity and the second threshold electric quantity, charging the battery module in the switched capacitor charging mode.
5. The charge and discharge method of claim 4, further comprising:
And replacing the battery core by using a reference step power supply, and establishing a mapping relation between the detection voltage output by the acquisition module and the voltage of the reference step power supply so as to calibrate the actual voltage of the battery module.
6. A terminal comprising a charge-discharge circuit according to any one of claims 1-3.
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| CN202111007844.5A CN113675926B (en) | 2021-08-30 | 2021-08-30 | Charging and discharging circuit, charging and discharging method and terminal |
| PCT/CN2021/119215 WO2023029114A1 (en) | 2021-08-30 | 2021-09-18 | Charging and discharging circuit, charging and discharging method and terminal |
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| CN202111007844.5A CN113675926B (en) | 2021-08-30 | 2021-08-30 | Charging and discharging circuit, charging and discharging method and terminal |
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| CN116598631B (en) * | 2023-07-17 | 2023-09-26 | 合肥国轩循环科技有限公司 | Lithium battery pack and charging and discharging method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108063486A (en) * | 2018-01-23 | 2018-05-22 | 深圳可立克科技股份有限公司 | The charger and its charging method, transformation of electrical energy circuit to charge suitable for multiple battery |
| CN109980306A (en) * | 2019-03-14 | 2019-07-05 | 浙江南都电源动力股份有限公司 | The optimization method of battery modules consistency |
| CN111521940A (en) * | 2020-04-30 | 2020-08-11 | 重庆车辆检测研究院有限公司 | Battery module testing method, device and equipment |
Family Cites Families (7)
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| CN108258348B (en) * | 2018-02-13 | 2022-04-29 | 中兴通讯股份有限公司 | Charging method, charging device, charging system, charging circuit, terminal and charging system |
| CN110198057A (en) * | 2018-02-26 | 2019-09-03 | 立锜科技股份有限公司 | Charging circuit and its power-switching circuit |
| CN110021973A (en) * | 2019-02-03 | 2019-07-16 | 华为技术有限公司 | The method of terminal device and control conversion circuit |
| CN111886775B (en) * | 2019-02-28 | 2021-06-15 | Oppo广东移动通信有限公司 | Charging method and charging device |
| EP3905476A4 (en) * | 2019-03-22 | 2022-04-20 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Power supply device and method, and electronic device |
| EP3968486A4 (en) * | 2019-05-06 | 2022-06-15 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Charging method and charging apparatus |
| CN112821475B (en) * | 2019-11-15 | 2024-04-02 | 北京小米移动软件有限公司 | Charging circuit, charging control method and device |
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|---|---|---|---|---|
| CN108063486A (en) * | 2018-01-23 | 2018-05-22 | 深圳可立克科技股份有限公司 | The charger and its charging method, transformation of electrical energy circuit to charge suitable for multiple battery |
| CN109980306A (en) * | 2019-03-14 | 2019-07-05 | 浙江南都电源动力股份有限公司 | The optimization method of battery modules consistency |
| CN111521940A (en) * | 2020-04-30 | 2020-08-11 | 重庆车辆检测研究院有限公司 | Battery module testing method, device and equipment |
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