CN111262296A - Double-battery charging structure and mobile terminal - Google Patents
Double-battery charging structure and mobile terminal Download PDFInfo
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- CN111262296A CN111262296A CN202010130634.4A CN202010130634A CN111262296A CN 111262296 A CN111262296 A CN 111262296A CN 202010130634 A CN202010130634 A CN 202010130634A CN 111262296 A CN111262296 A CN 111262296A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0024—Parallel/serial switching of connection of batteries to charge or load circuit
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- 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 embodiment of the application discloses double cell charging structure and mobile terminal, this double cell charging structure includes: the charging circuit comprises a first battery, a first charging chip, a second battery, a second charging chip and a load switch; the first battery and the first charging chip are connected in series to form a first charging path, and the second battery and the second charging chip are connected in series to form a second charging path; the first end of the load switch is connected with the first battery, and the second end of the load switch is connected with the second battery; the load switch disconnects the first battery and the second battery to be in a first charging mode, a first charging path works in the first charging mode to enable the first charging chip to charge the first battery, and a second charging path works to enable the second charging chip to charge the second battery; and the load switch closes the first battery and the second battery to be connected in parallel to form a power supply. So, control load switch disconnection when charging, make two charging chip charge parallelly connected battery alone, alleviate the charging circuit condition of generating heat, prolong the life of battery.
Description
Technical Field
The application relates to a charging technology, in particular to a double-battery charging structure and a mobile terminal.
Background
With the popularization of the fast charging technology (referred to as "fast charging technology") of mobile terminals, the charging current of the fast charging technology evolves from 3A, 4A, 5A to 8A and more. Along with charging current constantly improves, under the condition that receives protection shield area design restriction, the battery temperature rise is great, can directly influence the life and the security of battery, when adopting the quick operation of filling of current quick technique realization battery, can cause great injury and consumption to the battery.
Disclosure of Invention
In order to solve the foregoing technical problem, embodiments of the present application are directed to providing a dual battery charging structure and a mobile terminal.
The technical scheme of the application is realized as follows:
in a first aspect, there is provided a dual battery charging structure, including: the charging circuit comprises a first battery, a first charging chip, a second battery, a second charging chip and a load switch;
the first battery and the first charging chip are connected in series to form a first charging path, and the second battery and the second charging chip are connected in series to form a second charging path;
the first end of the load switch is connected with the first battery, and the second end of the load switch is connected with the second battery;
the load switch disconnects the first battery and the second battery to be in a first charging mode, the first charging path works in the first charging mode to enable the first charging chip to charge the first battery, and the second charging path works to enable the second charging chip to charge the second battery;
and the load switch closes the first battery and the second battery to be connected in parallel to form a power supply.
In a second aspect, a mobile terminal is provided, including: any one of the double-battery charging structures provided by the embodiments of the present invention.
The utility model provides a double cell charging structure and mobile terminal, this double cell charging structure includes: the charging circuit comprises a first battery, a first charging chip, a second battery, a second charging chip and a load switch; the first battery and the first charging chip are connected in series to form a first charging path, and the second battery and the second charging chip are connected in series to form a second charging path; the first end of the load switch is connected with the first battery, and the second end of the load switch is connected with the second battery; the load switch disconnects the first battery and the second battery to be in a first charging mode, the first charging path works in the first charging mode to enable the first charging chip to charge the first battery, and the second charging path works to enable the second charging chip to charge the second battery; and the load switch closes the first battery and the second battery to be connected in parallel to form a power supply. So, through increasing load switch between two charging paths of battery, control load switch disconnection when charging, make two charging chip charge parallelly connected battery alone, alleviate the charging path condition of generating heat, the life of extension battery.
Drawings
FIG. 1 is a schematic diagram of the structure of a mobile terminal battery;
FIG. 2 is a schematic diagram of a dual battery parallel charging circuit;
FIG. 3 is a schematic diagram of a measured data curve of a parallel dual battery charging circuit;
FIG. 4 is a schematic diagram of a first structure of a dual battery charging structure in an embodiment of the present application;
FIG. 5 is a second structural schematic diagram of a dual battery charging configuration in an embodiment of the present application;
FIG. 6 is a schematic diagram of a first component of a dual battery charging system in an embodiment of the present application;
fig. 7 is a schematic diagram of a second component structure of the dual-battery charging system in the embodiment of the present application.
Detailed Description
So that the manner in which the features and elements of the present embodiments can be understood in detail, a more particular description of the embodiments, briefly summarized above, may be had by reference to embodiments, some of which are illustrated in the appended drawings.
At present, a lithium ion battery for a mobile terminal is composed of a battery cell and a protection board. Battery cell: the lithium ion and its compound are used to realize energy absorption (charge) and energy release (discharge) by cycling reaction, and in short, the battery is a battery without a protection plate. Besides realizing overcharge, overdischarge, overcurrent and short circuit protection, the protection board is also internally provided with modules such as a coulometer (a tool for evaluating the electric quantity of the battery in real time, which can monitor the voltage of the battery core in real time and the current flowing into or out of the battery core), temperature detection, battery identification and the like according to the design requirements of mobile terminal manufacturers.
Fig. 1 is a schematic diagram of a composition structure of a mobile terminal battery, as shown in fig. 1, the battery includes a battery core 11 and a protection plate 12, an electricity meter 121, a first protection chip 122, a second protection chip 123 and other modules 124 are disposed in the protection plate 12, and the other modules 124 may specifically include a temperature detection module, a battery identification module, and the like. The battery is connected to the mobile terminal main board 10.
According to the requirement of structure stacking, currently, a plurality of mobile terminals select two batteries to be connected in parallel for use, and the battery capacity is increased to improve the endurance time. In order to fully utilize the structural space, the two batteries are usually separately placed and respectively arranged at different positions of the whole machine.
In the current technical scheme, one charging IC outputs total charging current to be shunted to two batteries. However, since the two batteries are placed at a certain distance, the distance between the charging IC and the two batteries is different (the transmission medium may be different), which causes the impedance difference between the output of the charging IC (i.e. the junction point of the two batteries connected in parallel) and each battery path.
Fig. 2 is a schematic diagram of a dual-battery parallel charging circuit, which includes a charging IC main battery and a sub-battery, the main battery voltage is U1, the sub-battery voltage is U2, the total charging current from the charging IC to the junction of the main battery and the sub-battery in parallel is I0, the main battery path impedance from the junction to the main battery is R1, the main battery charging current is I1, the sub-battery path impedance from the junction to the sub-battery is R2, and the sub-battery charging current is I2. After parallel connection, two paths of impedances are different during charging, so that charging currents of two batteries are different in shunt. And the aging degrees of the two batteries may not be synchronous (the internal resistance changes are asynchronous), which results in larger difference of the charging path impedances, for example, the charging path impedances of the two batteries have difference of R2-R1 > 50m omega. The voltage difference between the two batteries is caused by different charging current shunts of the two batteries, the voltage difference is larger when the shunt is larger, and the situation that one battery (the battery with larger path impedance) is not fully charged can occur, particularly in a scene of always using constant current charging.
Fig. 3 is a schematic diagram of an actually measured data curve of a parallel charging circuit with two batteries, where the actually measured data waveform includes a charging current curve graph and a primary-secondary battery core voltage difference, and the charging current curve graph includes: a total charging current I0, a main battery charging current I1, and a sub-battery charging current I2. When the total charging current output by the charging IC is 3.5A, the maximum difference between the charging current of the main battery and the charging current of the auxiliary battery is more than 500mA, and the voltage difference is close to 70 mV. For the problem caused by the current difference, the charging current is limited to a fixed value by adding a current limiting IC at the battery end in the prior art, which is equivalent to reducing the current to balance the current difference, but the full charging time is prolonged.
In order to solve the above problem, an embodiment of the present application provides a dual battery charging structure, fig. 4 is a schematic view of a first structure of the dual battery charging structure in the embodiment of the present application, and as shown in fig. 4, the dual battery charging structure includes: a first battery 41, a first charging chip 42, a second battery 43, a second charging chip 44, and a load switch 45;
the first battery 41 and the first charging chip 42 are connected in series to form a first charging path, and the second battery 43 and the second charging chip 44 are connected in series to form a second charging path;
a first end of the load switch 45 is connected with the first battery 41, and a second end of the load switch 45 is connected with the second battery 43;
the load switch 45 disconnects the first battery 41 and the second battery 43 to be in a first charging mode, in the first charging mode, the first charging path operates to enable the first charging chip 42 to charge the first battery 41, and the second charging path operates to enable the second charging chip 44 to charge the second battery 43;
the load switch 45 closes the first battery 41 and the second battery 43 to form a power supply source in parallel.
In practical applications, an external charging power source is respectively connected to the first charging chip 42 and the second charging chip 44, and the two charging chips respectively output corresponding charging currents according to characteristics of corresponding batteries. After the charging is finished, the load switch 45 is controlled to be closed, so that the first battery 41 and the second battery 43 are connected in parallel to form a power supply source to supply power to the mobile terminal load.
In some embodiments, in the first charging mode, the first charging chip charges the first battery with a charging current greater than a first current threshold, and the second charging path operates the second charging chip to charge the second battery with a charging current greater than a first current threshold.
Here, the first current threshold may be a current greater than or equal to 2A. For example, when the first current threshold is 2A, the first charging mode is a fast charging mode, and a large current is used to charge the battery, so as to achieve the purpose of fast charging.
In some embodiments, the first battery and the second battery are in a first charging mode when the load switch is open and a first charging condition is met; wherein the first charging condition comprises: the battery voltage is greater than the first voltage threshold and less than the second voltage threshold.
That is to say, when the dual batteries are charged rapidly, in addition to controlling the load switch to be closed, the first charging condition is also required to be satisfied, that is, the voltages of the first battery and the second battery are within the rapid charging voltage range defined by the first voltage threshold and the second voltage threshold, so as to perform the large-current rapid charging operation on the batteries, otherwise, when the batteries are outside the rapid charging range, the large-current rapid charging operation cannot be performed, so as to avoid bringing extra loss to the batteries, and accelerate the aging speed of the batteries. For example, the first voltage threshold is 3.6V, and the second voltage threshold is 4.3V.
In other embodiments, the first charging condition further comprises: the charging current is greater than a first current threshold. Here, the charging current is a charging current on the first charging path or the second charging path. That is, if the current on the current charging path is small and the large current charging condition cannot be satisfied, the large current quick charging operation is not performed when the battery is charged.
In some embodiments, when the load switch is turned off and a second charging condition is satisfied, the first battery and the second battery are in a second charging mode, in the second charging mode, the first charging path is operated to enable the first charging chip to charge the first battery with a charging current smaller than a second current threshold, and the second charging path is operated to enable the second charging chip to charge the second battery with a charging current smaller than the second current threshold; wherein the first current threshold is greater than or equal to the second current threshold. For example, the second current threshold is less than or equal to 2A.
In some embodiments, the second charging condition comprises at least one of: the charging current is less than a second current threshold; the battery voltage is less than a third voltage threshold; the battery voltage is greater than a fourth voltage threshold; wherein the third voltage threshold is less than the fourth voltage threshold. For example, the third voltage threshold is less than or equal to the first voltage threshold, and the fourth voltage threshold is greater than or equal to the second voltage threshold.
That is, if the load switch is turned off but the second charging condition is satisfied, the first charging chip charges the first battery with a charging current smaller than the second current threshold, and the second charging chip charges the second battery with a charging current smaller than the second current threshold.
The first current threshold is greater than or equal to the second current threshold, namely the first charging mode is a large-current fast charging mode, and the second charging mode is a small-current slow charging mode. The large-current quick charging mode can be realized by adopting any one of the existing quick charging technologies, and the small-current slow charging mode can be realized by adopting any one of the existing common charging technologies.
In some embodiments, the dual battery charging structure further comprises: a first protective plate and a second protective plate; the first battery is assembled on the first protection plate and is connected with the first charging chip in series to form the first charging path; the second battery is assembled on the second protection plate and is connected with the second charging chip in series to form the second charging path.
In some embodiments, the dual battery charging structure further comprises: a first electricity meter and a second electricity meter; the first electricity meter is used for evaluating the first battery capacity, and the second electricity meter is used for evaluating the second battery capacity;
wherein the first fuel gauge is mounted on the first charging protection plate, and the second fuel gauge is mounted on the second charging protection plate; or, the first electricity meter is connected in series between the first battery and the first charging chip, and the second electricity meter is connected in series between the first battery and the second charging chip.
That is, the electricity meter may be mounted on the charging protection plate or may be externally provided on the charging path. The fuel gauge monitors the battery voltage and current for feedback to the system to control the charging current, and the fuel gauge can also assess the capacity of each battery in real time.
In some embodiments, the dual battery charging structure further comprises: a charging protection unit; the first end of the charging protection unit is connected with a charging power supply, and the second end of the power supply protection unit is connected with the first charging chip and the second charging chip and used for charging protection of the first battery and the second battery.
That is to say, when the external charging power supply of the mobile terminal is used, the charging current firstly passes through the charging protection unit and then reaches the battery end through the charging chip. The charging protection unit is used for performing overvoltage protection, negative voltage protection and the like on the charging circuit.
Adopt above-mentioned technical scheme, through increasing load switch between two charging path of battery, control load switch disconnection when charging, make two charging chip charge alone parallelly connected batteries, different battery characteristics can adopt different charging parameters, do not receive charging path impedance and the ageing influence of battery, and charging current is controllable, guarantees that two batteries can both be full of, and alleviates the charging path condition of generating heat, prolongs the life of battery.
Fig. 5 is a schematic diagram of a second structure of a dual-battery charging structure in an embodiment of the present application, as shown in fig. 5, the dual-battery charging structure includes: a first battery 41, a first charging chip 42, a second battery 43, a second charging chip 44, and a load switch 45;
the first battery 41 and the first charging chip 42 are connected in series to form a first charging path, and the second battery 43 and the second charging chip 44 are connected in series to form a second charging path;
a first end of the load switch 45 is connected with the first battery 41, and a second end of the load switch 45 is connected with the second battery 43;
the load switch 45 disconnects the first battery 41 and the second battery 43 to be in a first charging mode, in the first charging mode, the first charging path operates to enable the first charging chip 42 to charge the first battery 41, and the second charging path operates to enable the second charging chip 44 to charge the second battery 43;
the load switch 45 closes the first battery 41 and the second battery 43 to form a power supply source in parallel;
the load switch 45 is closed, so that the first battery 41 and the second battery 43 are connected in parallel and then connected with the third charging chip 46 to form a third charging path;
when the load switch 45 is closed and a second charging condition is satisfied, the first battery 41 and the second battery 43 are in a third charging mode, and in the third charging mode, the third charging path operates to charge the first battery 41 and the second battery 43 by the third charging chip 46.
In some embodiments, the second charging condition comprises at least one of: the charging current is less than a third current threshold; the battery voltage is less than a third voltage threshold; the battery voltage is greater than a fourth voltage threshold; wherein the third voltage threshold is less than the fourth voltage threshold. For example, the third voltage threshold is less than or equal to the first voltage threshold, and the fourth voltage threshold is greater than or equal to the second voltage threshold.
Here, the first battery and the second battery are simultaneously charged using the third charging chip if the load switch is closed but the second charging condition is satisfied. And in the third charging mode, the third charging path works to enable the third charging chip to charge the first battery and the second battery with the charging current smaller than a second current threshold value.
The first current threshold is greater than or equal to the second current threshold, namely the first charging mode is a large-current fast charging mode, and the second charging mode and the third charging mode are small-current slow charging modes. The large-current quick charging mode can be realized by adopting any one of the existing quick charging technologies, and the small-current slow charging mode can be realized by adopting any one of the existing common charging technologies.
In some embodiments, the dual battery charging structure further comprises: a first electricity meter and a second electricity meter; the first electricity meter is used for evaluating the first battery capacity, and the second electricity meter is used for evaluating the second battery capacity;
wherein the first fuel gauge is mounted on the first charging protection plate, and the second fuel gauge is mounted on the second charging protection plate; or, the first electricity meter is connected in series between the first battery and the first charging chip, and the second electricity meter is connected in series between the first battery and the second charging chip.
That is, the electricity meter may be mounted on the charging protection plate or may be externally provided on the charging path. The fuel gauge monitors the battery voltage and current for feedback to the system to control the charging current, and the fuel gauge can also assess the capacity of each battery in real time.
In some embodiments, the dual battery charging structure further comprises: a charging protection unit; the first end of the charging protection unit is connected with a charging power supply, and the second end of the power supply protection unit is connected with the first charging chip, the second charging chip and the third charging chip and is used for charging protection of the first battery and the second battery.
That is to say, when the external charging power supply of the mobile terminal is used, the charging current firstly passes through the charging protection unit and then reaches the battery end through the charging chip. The charging protection unit is used for performing overvoltage protection, negative voltage protection and the like on the charging circuit.
Adopt above-mentioned technical scheme, through increasing load switch between two charging path of battery, control load switch disconnection when charging, make two charging chip charge alone parallelly connected batteries, different battery characteristics can adopt different charging parameters, do not receive charging path impedance and the ageing influence of battery, and charging current is controllable, guarantees that two batteries can both be full of, and alleviates the charging path condition of generating heat, prolongs the life of battery.
On the basis of the foregoing embodiments, two specific application examples of the dual battery charging system are provided, fig. 6 is a schematic diagram of a first composition structure of the dual battery charging system in the embodiment of the present application, and as shown in fig. 6, the dual battery charging system includes: the USB charging interface comprises a double-battery charging structure, a USB charging interface, a USBPhy/UART and other related interface modules.
The USB interface is connected with the power adapter through a USB data line and used as a charging interface of the mobile terminal. The USB interface can be a USB2.0, USB3.0 or USB Type-C port.
And the related interface modules such as the USBPhy/UART and the like are connected with the USB interface through signal wires such as D +/D-, c1/c2 and the like, and are used for realizing the input and output operation of signals.
The dual battery charging structure includes: a negative pressure and overvoltage protection unit, a PMI management unit, a charging IC1 (i.e., a first charging chip), a battery 1, a protection board 1 (on which a fuel gauge 1 is mounted on the protection board 1), a charging IC2 (i.e., a second charging chip), a protection board 2 (on which a fuel gauge 2 is mounted on the protection board 2), and a load switch.
The USB interface is connected with the negative pressure and overvoltage protection unit through VBUS/OTG, the negative pressure and overvoltage protection unit is connected with the PMI management unit through VBUS/OTG, the PMI management unit has a path management function, and the PMI management unit integrates a charging IC3 (namely a third charging chip) and is used for controlling a load switch to be closed and charging the battery 1 and the battery 2 when the charging current is small. The PMI management unit supplies power to the system through a VPH _ PWR pin. When the charging current is large, the load switch is controlled to be switched off, and the charging IC1 and the charging IC2 are switched on to charge the battery 1 and the battery 2 with large current.
The negative pressure and overvoltage protection unit is connected with the charging IC1 and the charging IC2 through VBUS, and the charging IC1 and the charging IC2 are connected with the MCU or the AP for communication.
Battery 1 assembles on protection board 1, and protection board 1 connects MCU or AP to communicate, and battery 2 assembles on protection board 2, and protection board 2 connects MCU or AP to communicate. The battery in the embodiment of the present application may also be understood as a battery core.
And two ends of the load switch are respectively connected with the battery 1 and the battery 2, and the load switch is connected with the MCU or the AP for control communication.
In practical application, the PMI management unit with charging function may replace one of the charging ICs, and fig. 7 is a schematic diagram of a second component structure of the dual-battery charging system in the embodiment of the present application, as shown in fig. 7,
when the load switch is turned off and the high-current quick-charging condition (i.e., the first charging condition) is met, the IPM management unit serves as a charging IC to perform high-current quick-charging on the battery 1, and an externally-arranged charging IC additionally performs high-current quick-charging on the battery 2.
When the load switch is turned off and the low-current slow-charge condition (i.e., the second charge condition) is satisfied, the IPM management unit serves as the charging IC to perform low-current charging on the battery 1, and the additionally configured external charging IC performs low-current charging on the battery 2.
When the load switch is closed and the low-current slow-charge condition (i.e., the second charge condition) is satisfied, the IPM management unit serves as a charge IC to charge the battery 1 and the battery 2; alternatively, the external charging IC charges the battery 1 and the battery 2.
The double-battery charging structure provided by the embodiment of the application can be applied to any mobile terminal and is used for realizing the charging operation of the mobile terminal.
Adopt above-mentioned double cell charge structure's mobile terminal, through increase load switch between two charging path of battery, control load switch disconnection when charging, make two charging chip charge alone parallelly connected batteries, different battery characteristics can adopt different charging parameters, do not receive charging path impedance and the ageing influence of battery, charging current is controllable, guarantee that two batteries can both be full of, and alleviate the charging path condition of generating heat, the life of extension battery.
It should be noted that: "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
The charging structures disclosed in the several embodiments provided in the present application can be combined arbitrarily without conflict, resulting in a new embodiment of the charging structure.
Features disclosed in several of the product embodiments provided in the present application may be combined in any combination to yield new product embodiments without conflict.
The features disclosed in the several method or device embodiments provided in the present application may be combined in any combination to arrive at a new method or device embodiment without conflict.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A dual battery charging structure, comprising: the charging circuit comprises a first battery, a first charging chip, a second battery, a second charging chip and a load switch;
the first battery and the first charging chip are connected in series to form a first charging path, and the second battery and the second charging chip are connected in series to form a second charging path;
the first end of the load switch is connected with the first battery, and the second end of the load switch is connected with the second battery;
the load switch disconnects the first battery and the second battery to be in a first charging mode, the first charging path works in the first charging mode to enable the first charging chip to charge the first battery, and the second charging path works to enable the second charging chip to charge the second battery;
and the load switch closes the first battery and the second battery to be connected in parallel to form a power supply.
2. The dual battery charging structure of claim 1, wherein the first charging chip charges the first battery with a charging current greater than a first current threshold in the first charging mode, and the second charging path operates the second charging chip to charge the second battery with a charging current greater than a first current threshold.
3. The dual battery charging structure of claim 2,
when the load switch is switched off and a first charging condition is met, the first battery and the second battery are in a first charging mode;
wherein the first charging condition comprises: the battery voltage is greater than the first voltage threshold and less than the second voltage threshold.
4. The dual battery charging structure of claim 3,
when the load switch is switched off and a second charging condition is met, the first battery and the second battery are in a second charging mode, in the second charging mode, the first charging channel works to enable the first charging chip to charge the first battery with a charging current smaller than a second current threshold, and the second charging channel works to enable the second charging chip to charge the second battery with a charging current smaller than the second current threshold;
wherein the first current threshold is greater than or equal to the second current threshold.
5. The dual battery charging structure of claim 1, further comprising: a third charging chip;
the load switch is closed, so that the first battery and the second battery are connected in parallel and then are connected with the third charging chip to form a third charging path;
when the load switch is closed and a second charging condition is met, the first battery and the second battery are in a third charging mode, and in the third charging mode, the third charging channel works to enable the third charging chip to charge the first battery and the second battery.
6. The dual battery charging structure as claimed in claim 4 or 5, wherein the second charging condition includes at least one of:
the charging current is less than a second current threshold;
the battery voltage is less than a third voltage threshold;
the battery voltage is greater than a fourth voltage threshold; wherein the third voltage threshold is less than the fourth voltage threshold.
7. The dual battery charging structure of claim 5, further comprising: a charging protection unit;
the first end of the charging protection unit is connected with a charging power supply, and the second end of the power supply protection unit is connected with the first charging chip, the second charging chip and the third charging chip and is used for charging protection of the first battery and the second battery.
8. The dual battery charging structure of claim 1, further comprising: a first protective plate and a second protective plate;
the first battery is assembled on the first protection plate and is connected with the first charging chip in series to form the first charging path;
the second battery is assembled on the second protection plate and is connected with the second charging chip in series to form the second charging path.
9. The dual battery charging structure of claim 8, further comprising: a first electricity meter and a second electricity meter; the first electricity meter is used for evaluating the first battery capacity, and the second electricity meter is used for evaluating the second battery capacity;
wherein the first fuel gauge is mounted on the first charging protection plate, and the second fuel gauge is mounted on the second charging protection plate; or, the first electricity meter is connected in series between the first battery and the first charging chip, and the second electricity meter is connected in series between the first battery and the second charging chip.
10. A mobile terminal, characterized in that it comprises a dual battery charging structure according to any one of claims 1 to 9.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111817388A (en) * | 2020-07-14 | 2020-10-23 | Oppo广东移动通信有限公司 | Charging circuit and electronic device |
| CN112202219A (en) * | 2020-09-21 | 2021-01-08 | 重庆蓝岸通讯技术有限公司 | Intercom high-capacity battery charging device and charging method |
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| CN116707051A (en) * | 2022-10-26 | 2023-09-05 | 荣耀终端有限公司 | Dual-battery charge-discharge circuit, dual-battery charge-discharge method, electronic device and medium |
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