CN113675926A - Charging and discharging circuit, charging and discharging method and terminal - Google Patents

Charging and discharging circuit, charging and discharging method and terminal Download PDF

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Publication number
CN113675926A
CN113675926A CN202111007844.5A CN202111007844A CN113675926A CN 113675926 A CN113675926 A CN 113675926A CN 202111007844 A CN202111007844 A CN 202111007844A CN 113675926 A CN113675926 A CN 113675926A
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CN
China
Prior art keywords
charging
battery
module
battery module
electric quantity
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Pending
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CN202111007844.5A
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Chinese (zh)
Inventor
马铭翔
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Guangdong Genius Technology Co Ltd
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Guangdong Imoo Electronic Technology Co Ltd
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Priority to CN202111007844.5A priority Critical patent/CN113675926A/en
Priority to PCT/CN2021/119215 priority patent/WO2023029114A1/en
Publication of CN113675926A publication Critical patent/CN113675926A/en
Pending legal-status Critical Current

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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]
    • 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
    • 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
    • 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
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Abstract

The utility model belongs to the technical field of charge and discharge, a charge and discharge circuit, charge and discharge method and terminal are provided, battery parameter through obtaining the module and acquireing the battery module, then charge the battery module according to the charging mode that battery parameter selection corresponds by the charging module, the charging mode includes switched capacitor charging mode and Boost charging mode, after charging, the battery parameter when charging by the equalizing module confirms treating the equalizing electric core among the battery module, and treat equalizing electric core in order and carry out equalizing charge, thereby solve the problem that can't be full of because electric core impedance nonconformity leads to in the battery module.

Description

Charging and discharging circuit, charging and discharging method and terminal
Technical Field
The application belongs to the technical field of charging and discharging, and particularly relates to a charging and discharging circuit, a charging and discharging method and a terminal.
Background
With the development of the quick charging technology, the charging power of the mobile phone and the tablet is more than 60W. And because charging power is great, present original monocell framework wants to satisfy so big charging current, then can bring the wire rod and the huge generating heat on the board level, bring not good experience for the user. In view of this situation, the current mainstream is the method of using series batteries, which changes the battery voltage to 2 times of the single battery, and the current is 1/2 at the same charging power, so that the heating value of the charging path is reduced to 1/4 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 consistent, there are cases where one battery is completely charged or discharged and the other battery is not yet completed, which results in a situation where the usage time of the battery is shortened and the charging is never full when the user uses the battery.
Disclosure of Invention
An object of the application is to provide a charge-discharge circuit, a charge-discharge method and a terminal, aiming at solving the problem that the battery module cannot be fully charged due to inconsistent electrical core impedance.
A first aspect of an embodiment of the present application provides a charge and discharge circuit, including:
the acquisition module is used for acquiring battery parameters of the battery module; the battery module comprises a plurality of battery cores 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 core;
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 equalizing module is used for determining the electric core to be equalized according to the battery parameters when the battery module is charged and then equalizing and charging the electric core to be equalized in sequence.
In one embodiment, the charge and discharge circuit further includes:
the discharging module is used for selecting a corresponding discharging mode according to the battery parameters to discharge the battery module; the discharging mode comprises a switched capacitor discharging mode and a Buck discharging mode.
In one embodiment, the charge and 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 adapter identification module controls the charging module 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 comprises:
the battery module charging device comprises a Boost charging unit and a control unit, wherein the Boost charging unit charges the battery module in a Boost charging mode when the electric quantity of the battery module is smaller than a first threshold electric quantity or 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 comprises:
and the switch units are connected with the battery cores in parallel one by one and used for sequentially connecting the battery cores to be equalized to an equalizing charge loop so as to equalize and charge the battery cores to be equalized.
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 according to any one of the above embodiments, where the charging and discharging method includes:
acquiring battery parameters of a battery module; the battery module comprises a plurality of battery cores 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 core;
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 when the battery module is charged, determining the battery cell to be equalized according to the battery parameters, and performing equalizing charging on the battery cell to be equalized in sequence.
In one embodiment, the charging and discharging method further includes:
and replacing the battery core with a reference stepping power supply, and establishing a mapping relation between the detection voltage output by the acquisition module and the voltage of the reference stepping power supply so as to calibrate the actual voltage of the battery module.
In one embodiment, the selecting a 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, the battery module is charged 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, the battery module is charged in the switched capacitor charging mode.
In one embodiment, the sequentially equalizing and charging the cells to be equalized includes:
and based on a plurality of switch units, sequentially connecting the battery cells to be equalized to an equalizing charge circuit so as to perform equalizing charge on the battery cells to be equalized, wherein the switch units are connected with the battery cells in parallel one by one.
A third aspect of the embodiments of the present application further provides a terminal, where the terminal includes the charging and discharging circuit according to any of the embodiments.
The embodiment of the application provides a charging and discharging circuit, a charging and discharging method and a terminal, battery parameters of a battery module are obtained through an obtaining module, then the charging module selects 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, after charging is ended, an electric core to be equalized in the battery module is determined through the battery parameters when the equalizing module is charged and is ended, and equalizing charging is carried out on the electric core to be equalized in sequence, so that the problem that the electric core cannot be fully charged due to inconsistent electric core impedance in the battery module is solved.
Drawings
Fig. 1 is a schematic circuit diagram of a charging and discharging circuit according to an embodiment of the present disclosure;
fig. 2 is a schematic circuit diagram of another charging and discharging circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of a switched capacitor charging chip according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit diagram of an equalizing module according to an embodiment of the present disclosure;
fig. 5 is a schematic flow chart of a charging and discharging method according to an embodiment of the present disclosure;
fig. 6 is a schematic flowchart of step S21 in the charging and discharging method according to the embodiment of the present application;
fig. 7 is a schematic flow chart of another charging and discharging method according to an embodiment of the present disclosure;
fig. 8 is a schematic flow chart of another charging and discharging method according to an embodiment of the present disclosure;
fig. 9 is a schematic flow chart of another charging and discharging method according to an embodiment of the present disclosure;
fig. 10 is a schematic flow chart of another charging and discharging method according to an embodiment of the present disclosure;
fig. 11 is a schematic flow chart of another charging and discharging method according to an embodiment of the present disclosure.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present 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 merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" 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 will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The requirement for meeting such a large charging current in the original single cell framework can bring huge heating on wire rods and board levels, and brings poor experience to users. In view of this situation, the current mainstream is the method of using series batteries, which changes the battery voltage to 2 times of the single battery, and the current is 1/2 at the same charging power, so that the heating value of the charging path is reduced to 1/4 of the single battery under the same condition. While the current on the path due to the series cells is equal. When the impedances of the two batteries are not consistent, the charging or discharging of one battery is completed and the discharging of the other battery is not completed, so that the use time is shortened and the charging is always not full due to the use of a user.
In order to solve the above technical problem, an embodiment of the present application provides a charging and discharging circuit, which is shown in fig. 1 and includes an obtaining module 40, a charging module 20, and an equalizing module 30.
Specifically, the charging/discharging 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 battery parameters of the battery module 10, the battery parameters at least include the electric quantity of the battery module 10 and the voltage of each cell, the charging module 20 selects a corresponding charging mode according to the battery parameters 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 large current charging and a small current charging, the switched capacitor charging mode and the Boost charging mode may respectively perform a process of charging the battery module 10 by two charging circuits, for example, the switched capacitor charging mode may perform a charging process of the battery module 10 by a charging circuit composed of a switched capacitor charging chip and peripheral circuits thereof, the Boost charging mode may perform a charging process of the battery module 10 by a charging circuit composed of a Boost chip and peripheral circuits thereof.
In this embodiment, the obtaining module 40 is configured to obtain battery parameters of the battery module 10, the battery parameters of the battery module 10 may be sent to the obtaining module 40 by the battery management system, or may also be generated by a detection circuit or a detection module after detecting the battery module 10 and then sent to the obtaining module 40, the detection module may be integrated in the obtaining module 40, and the equalizing module 30 determines, when the charging of the battery module 10 is finished, an electric core to be equalized according to the battery parameters, and performs equalizing charging on the electric core to be equalized in sequence. Specifically, the main control module may determine an unfilled cell according to a battery parameter (e.g., a voltage of each cell) of the battery module 10 at the end of charging, for example, a theoretical full standard voltage of the cell is 4.4V, the detection module detects the parameter of the cell, if the voltage of the cell acquired by the acquisition module 40 is less than 4.4V, it is indicated that the cell is not full, the main control module marks the cell as a cell to be equalized, the equalization module 30 accesses the cell into an equalization charging loop, and the cell is equalized and charged by using a small current (e.g., in a Boost charging mode).
In one embodiment, referring to fig. 2, the charging and discharging circuit further includes a discharging module 50, and the discharging module 50 is configured to select a corresponding discharging mode according to the battery parameter to discharge the battery module 10; the discharging mode comprises a switched capacitor discharging mode and a Buck discharging mode.
In a specific application, the switched capacitor discharge mode and the Buck discharge mode may respectively correspond to a large current discharge and a small current discharge, and the switched capacitor discharge mode and the Buck discharge mode may respectively perform a discharge process of the battery module 10 by two discharge circuits, for example, the switched capacitor discharge mode may perform a discharge process of the battery module 10 by a discharge circuit composed of a switched capacitor charging chip and a peripheral circuit thereof, and the Buck discharge mode may perform a discharge process of the battery module 10 by a discharge circuit composed of a Buck chip and a peripheral circuit thereof.
In one embodiment, the battery discharge circuit may be composed of a switched capacitor converter discharge circuit for discharging the battery module 10 in a switched capacitor discharge mode and a BUCK discharge circuit for discharging the battery module 10 in a BUCK discharge mode.
In this embodiment, the efficiency of the switched capacitor converter circuit is more than 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 output voltage of the switched capacitor fast charger chip is directly reflected on the input voltage variation, which may trigger the under-voltage protection of the battery.
In one embodiment, referring to fig. 2, the charging and discharging circuit further comprises an adapter identification module 60. In this embodiment, the adapter identification module 60 is configured to obtain a parameter of an adapter connected to the charging module 20, and if the parameter of the adapter is a preset adapter parameter, 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 and a switched capacitor charging unit 22.
The Boost charging unit 21 charges the battery module 10 in a Boost charging mode when the electric quantity of the battery module 10 is smaller than a first threshold electric quantity or the electric quantity of the battery module 10 is larger than a second threshold electric quantity.
In this embodiment, the Boost charging unit may be a Boost charging circuit composed of a Boost chip and a peripheral circuit thereof, and when the battery is precharged and charged at a constant voltage, the Boost charging unit may be switched to the charging channel to charge the battery module 10, so that the charging state of the battery may be better managed by using the Boost charging circuit, and battery protection triggered by abnormal charging of the battery is prevented. And because the BOOST charging circuit has a battery path management circuit, after the charging of the chip (such as a power management chip, a BOOST chip, and the like) is cut off, the MOS transistor between the battery module 10 and the charging of the chip is disconnected, and in a light load mode, all the electricity of the system is provided by the SYS network, at this time, the charging module does not charge or 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 amount of power of the battery module 10 is between a first threshold value power and a second threshold value power.
In this embodiment, the switched capacitor charging unit may be a charging circuit composed of a switched capacitor charging chip (e.g., BQ2597x, etc.) and a peripheral circuit thereof, and the switched capacitor charging chip has a characteristic of high charging efficiency, and the charging efficiency of the switched capacitor charging chip can reach more than 98%, and is particularly suitable for a current large-current fast charging scenario.
In one embodiment, referring to fig. 2, the charging and discharging circuit further includes a charging switch 70, and the charging switch 70 is configured to switch the Boost charging unit and the switched capacitor charging unit to charge the battery module 10 according to a switching instruction sent by the main control module.
FIG. 3 is a schematic diagram of the switched capacitor charging chip, and referring to FIG. 5, when the switch G1 and the switch G3 are turned on and the switch G2 and the switch G4 are turned off, V is set toin＝VCFLY+VOUT，IIN＝ICFLY＝IOUT；CINFor the voltage across the input capacitor, VCFLYIs the voltage across the capacitor CFLY, COUTIs an output capacitor; when the switch tube G1 and the switch tube G3 are disconnected and the switch tube G2 and the switch tube G4 are connected, V isCFLY＝VOUT，ICFLY＝IOUT(ii) a Thus, VOUT＝(1/2)*Vin，IOUT＝2*IIN。
Therefore, according to the voltage-current conversion characteristics, the output voltage is 1/2 times 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. Because the output current of the switched capacitor charging unit is large, the switched capacitor charging mode is only used during constant current charging of the battery, 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 charges the battery module 10 quickly.
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 equalizing module 30 includes a plurality of switch units, and the switch units are connected in parallel with the plurality of battery cells one by one, and are configured to sequentially connect the battery cells to be equalized to the equalizing charge circuit, so as to perform equalizing charge on the battery cells to be equalized.
In this embodiment, the plurality of switch units are connected in parallel with the battery cells one by one, and the plurality of switch units are turned on or turned off according to the received switch control signal, so that the battery cell to be equalized is connected to the equalizing charge circuit, and the equalizing charge is performed on the battery cell to be equalized.
In specific application, each switch unit can be composed of a switch tube, a relay and other switch devices, 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 control signal is switched on, the battery cell corresponding to the switch unit is short-circuited, and then the battery cell corresponding to the switch unit is switched off, and then the battery cell corresponding to the switch unit is switched into the equalizing charging loop.
Referring to fig. 4, a battery equalization circuit is formed by three switching tubes and two resistors. When the battery is charged, two detection pins (pin ADC1, ADC2) of the acquisition module respectively detect voltages of the first battery cell 11 and the second battery cell 12, and theoretically, voltages of the battery cells in a full state are both 4.4V. When the voltage of the first battery cell 11 is lower than 4.4V, the first switch tube Q1 is turned on, 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, the charging current is charged within 100mA due to the current limiting of the second resistor R2, 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 cell 12 is detected to be lower than 4.4V, the second switch tube Q2 and the third switch tube Q3 are opened, 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 third switch tube Q3, the first resistor R1 and the second battery cell 12, the charging current is charged within 100mA due to the current limitation of the first resistor R1, after the second battery cell 12 is fully charged, the second switch tube Q2 and the third switch 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 a PMOS tube. The gates of the first switch transistor Q1, the second switch transistor Q2 and the third switch transistor Q3 are connected to the main control module.
The main control module determines the battery cell to be equalized according to the battery cell voltage output by the acquisition module, sends a corresponding switch control signal to the equalization module 30, and controls the on and off of the plurality of switch units, so that the battery cell to be equalized is connected to the equalizing charge circuit, and the equalizing charge is performed on the battery cell to be equalized.
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 above embodiments, and as shown in fig. 5, the charging and discharging method includes step S10, step S20, and step S30.
In step S10, battery parameters of the battery module are acquired; the battery module comprises a plurality of electric cores which are connected in series according to a sequence, and the battery parameters at least comprise the electric quantity of the battery module and the voltage of each electric core.
In step S20, 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.
In step S30, when the battery module is not charged, determining the battery cell to be equalized according to the battery parameters, and performing equalizing charging on the battery cell to be equalized in sequence.
In one embodiment, referring to fig. 6, in step S20, a corresponding charging mode is selected according to the battery parameters to charge the battery module, including step S21 and step S22.
In step S21, 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, the battery module is charged in the Boost charging mode.
In step S22, when the power of the battery module is between the first threshold power and the second threshold power, the battery module is charged in the switched capacitor charging mode.
In one embodiment, referring to fig. 7, the charging and discharging method further includes step S60.
In step S60, parameters of an adapter that is connected to the charging module are acquired, and if the parameters of the adapter are preset adapter parameters, the charging module is controlled to establish a communication connection with the adapter, so as to identify a charging protocol between the charging module and the adapter.
In one application scenario, as illustrated in fig. 8, the above charging and discharging method may be implemented by the following steps S61, S62, S63, S64, S65, S66, S67, and S68.
S61: and inserting the adapter, and acquiring the 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 a Boost charging unit to charge the battery module, and recognizing the BC1.2 protocol.
BC1.2(Battery Charging v1.2) is a protocol established by BC (Battery Charging) group under USB-IF, mainly for specifying the requirements of Battery Charging, and was originally implemented based on USB2.0 protocol. The USB2.0 protocol specifies that the maximum current drawn by the peripheral from the USB charger is 500mA, and the current limit of 500mA cannot meet the increasing demand for fast charging. 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 a USB protocol, the maximum current is 500mA, and the SDP can be regarded as a common USB interface; the DCP does not support a data protocol, supports quick charging and can provide large current, and the DCP is mainly used for special chargers such as wall charging and the like; CDP supports both data protocols and fast charging.
S63: if the BC1.2 protocol identification fails, the adapter accessed by the charging module is judged to be a non-standard adapter, and the Boost charging unit charges the battery module with low current.
S64: and if the BC1.2 protocol is successfully identified, controlling the charging module to establish communication connection with the adapter so as to identify the quick charging protocol between the charging module and the adapter.
S65: if the quick charge protocol is successfully identified, whether the electric quantity of the battery module meets a 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 switched capacitor charging unit is used for quickly charging the battery module.
S65: if the constant current charging condition is not met, the battery module is charged in the BC1.2 mode.
S66: and if the constant current charging condition is met, starting the switched capacitor charging unit to charge the battery module in a switched capacitor charging mode.
S66: and if the electric quantity of the battery module reaches the second threshold electric quantity, switching to a Boost charging unit to charge the battery module in a Boost charging mode.
In one embodiment, referring to fig. 9, the charging and discharging method further includes step S40.
In step S40, selecting a corresponding discharging mode according to the battery parameters to discharge the battery module; the discharging mode comprises a switched capacitor discharging mode and a Buck discharging mode.
In one application scenario, as shown in fig. 10, the charging and discharging method may be implemented by the following steps S81, S82, S83, S84, and S85.
S81: and starting up the electric equipment, accessing the electric equipment into the battery module, defaulting to the BUCK discharge circuit for power supply, 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 discharge circuit is started to supply power.
S85: when the battery module discharges to the voltage smaller than the first threshold voltage, the BUCK discharge circuit is switched to supply power.
In one embodiment, referring to fig. 11, the charging and discharging method further includes step S50.
In step S50, a reference stepping power supply is used to replace the electric core, and a mapping relationship between the detection voltage output by the acquisition module and the voltage of the reference stepping power supply is established, so as to calibrate the actual voltage of the battery module.
In this embodiment, since the detection module performs voltage acquisition after dividing the voltage of the battery cell by using the voltage dividing circuit composed of voltage dividing resistors, in order to avoid detection errors occurring in the voltage dividing detection process, the voltage acquired by the acquisition module from the detection module is calibrated by simulating the battery cell in the battery module using two reference stepping power supplies, for example, a mapping relationship between the detection voltage output by the acquisition module and the voltage of the reference stepping 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 preset stepping voltage (for example, the stepping voltage is set to be 0.1V), from 3.3V to 4.4V, the detection module adopts two resistor partial pressures to reduce the first battery cell in an 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, in practical application, when the main control module acquires the first battery cell detection voltage value output by the acquisition module, the actual voltage of the first battery cell is determined according to the first battery cell detection voltage value and the mapping relation table, and abnormal equalizing charging 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 preset stepping voltage (for example, the stepping voltage is set to be 0.1V), from 3.3V to 4.4V, the acquisition module adopts two resistor voltage divisions to reduce the second 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, in practical application, when the main control module acquires the second battery cell detection voltage value output by the acquisition module, the actual voltage of the second battery cell is determined according to the second battery cell detection voltage value and the mapping relation table, and abnormal equalizing charging caused by detection errors is avoided.
After the calibration is finished, the reference electric core is inserted into the battery module, the obtaining module detects whether the detection voltage values of the reference electric core and the reference electric core are consistent with the mapping relation table, and if not, the calibration step S50 is executed again.
In one embodiment, the sequentially equalizing and charging the cells to be equalized includes: and based on a plurality of switch units, sequentially connecting the battery cells to be equalized to an equalizing charge circuit so as to perform equalizing charge on the battery cells to be equalized, wherein the switch units are connected with the battery cells in parallel one by one.
For simplicity of description, the specific working processes of step S10, step S20, step S30, step S40, step S50 and step S60 described above may refer to the description of the working principle of the charging and discharging circuit in fig. 1 to fig. 4, and are not described herein again.
The embodiment of the application further provides a terminal, and the terminal comprises the charging and discharging circuit in any one of the embodiments.
The embodiment of the application provides a charging and discharging circuit, a charging and discharging method and a terminal, battery parameters of a battery module are obtained through an obtaining module, then the charging module selects 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, after charging is ended, an electric core to be equalized in the battery module is determined through the battery parameters when the equalizing module is charged and is ended, and equalizing charging is carried out on the electric core to be equalized in sequence, so that the problem that the electric core cannot be fully charged due to inconsistent electric core impedance in the battery module is solved.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The units described as separate parts may or may not be physically separate, and parts displayed 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 can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A charging and discharging circuit, comprising:
the acquisition module is used for acquiring battery parameters of the battery module; the battery module comprises a plurality of battery cores 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 core;
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 equalizing module is used for determining the electric core to be equalized according to the battery parameters when the battery module is charged and then equalizing and charging the electric core to be equalized in sequence.
2. The charge and discharge circuit of claim 1, further comprising:
the discharging module is used for selecting a corresponding discharging mode according to the battery parameters to discharge the battery module; the discharging mode comprises a switched capacitor discharging mode and a Buck discharging mode.
3. The charge and discharge circuit of claim 1, further comprising:
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 adapter identification module controls the charging module to establish communication connection with the adapter so as to identify a charging protocol between the charging module and the adapter.
4. The charge and discharge circuit of claim 1, wherein the charging module comprises:
the battery module charging device comprises a Boost charging unit and a control unit, wherein the Boost charging unit charges the battery module in a Boost charging mode when the electric quantity of the battery module is smaller than a first threshold electric quantity or 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.
5. The charging and discharging circuit according to any one of claims 1 to 4, wherein the equalizing module comprises:
and the switch units are connected with the battery cores in parallel one by one and used for sequentially connecting the battery cores to be equalized to an equalizing charge loop so as to equalize and charge the battery cores to be equalized.
6. A charging and discharging method applied to the charging and discharging circuit according to any one of claims 1 to 5, comprising:
acquiring battery parameters of a battery module; the battery module comprises a plurality of battery cores 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 core;
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 when the battery module is charged, determining the battery cell to be equalized according to the battery parameters, and performing equalizing charging on the battery cell to be equalized in sequence.
7. The charge and discharge method according to claim 6, further comprising:
and replacing the battery core with a reference stepping power supply, and establishing a mapping relation between the detection voltage output by the acquisition module and the voltage of the reference stepping power supply so as to calibrate the actual voltage of the battery module.
8. The charging and discharging method according to claim 6, wherein the selecting the corresponding charging mode according to the battery parameter to charge the battery module comprises:
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, the battery module is charged 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, the battery module is charged in the switched capacitor charging mode.
9. The charging and discharging method according to any one of claims 6 to 8, wherein the step of equalizing and charging the cells to be equalized sequentially comprises:
and based on a plurality of switch units, sequentially connecting the battery cells to be equalized to an equalizing charge circuit so as to perform equalizing charge on the battery cells to be equalized, wherein the switch units are connected with the battery cells in parallel one by one.
10. A terminal, characterized in that it comprises a charging and discharging circuit according to any of claims 1-5.
CN202111007844.5A 2021-08-30 2021-08-30 Charging and discharging circuit, charging and discharging method and terminal Pending CN113675926A (en)

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