CN111277025A - Charging method and charging system for parallel batteries - Google Patents
Charging method and charging system for parallel batteries Download PDFInfo
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Abstract
The invention provides a charging method and a charging system of parallel batteries, wherein the method comprises the steps of detecting the cell voltage value of a small-capacity battery in the parallel batteries with different capacities; detecting the cell voltage value of a high-capacity battery in the parallel batteries with different capacities; converting the charging modes of the small-capacity battery and the large-capacity battery according to the cell voltage value of the small-capacity battery and the cell voltage value of the large-capacity battery respectively; and detecting whether the battery which is not fully charged exists or not, and selecting a charging current corresponding to the electric quantity and the voltage of the battery which is not fully charged according to the electric quantity and the voltage of the battery which is not fully charged to charge the battery which is not fully charged until the charging is finished. The system comprises a module corresponding to the method.
Description
Technical Field
The invention provides a charging method and a charging system for parallel batteries, and belongs to the technical field of batteries.
Background
Due to structural limitations of mobile phones and tablet personal computers, in order to exert larger battery capacity, a charging scheme that two batteries are connected in parallel is generally adopted to enlarge the battery pack capacity of a mobile phone or a tablet personal computer, but when the factors such as materials, systems and capacities of the two batteries are different, the factors such as space size, charging path impedance and battery aging cause that a small-capacity battery is often charged quickly and a large-capacity battery is charged slowly, and in the charging process, the small battery is overcharged and the large battery is not fully charged, so that the battery aging is accelerated, and the use of a user is influenced. Therefore, in the prior art, all mobile phones or tablet computers use two batteries connected in parallel and having the same material, system, size and charging rate, specifically as shown in fig. 1, fig. 2 and fig. 3, the two schemes often cause the design of the battery pack to be limited because the battery system and the rate must be the same, and are not favorable for the space utilization of the battery, and meanwhile, when the aging states of the two batteries are different, the overall aging speed of the battery pack is accelerated, the battery life and the user experience are affected, and the battery safety problem exists.
Disclosure of Invention
The invention provides a charging method and a charging system of parallel batteries, which are used for solving the problem that the parallel batteries with different capacities and different chemical systems are not synchronously charged in the quick charging process, and adopt the following technical scheme:
a charging method for parallel batteries, the charging method charging parallel batteries of different capacities, the charging method comprising:
detecting the cell voltage value of a small-capacity battery in the parallel batteries with different capacities;
detecting the cell voltage value of a high-capacity battery in the parallel batteries with different capacities;
converting the charging modes of the small-capacity battery and the large-capacity battery according to the cell voltage value of the small-capacity battery and the cell voltage value of the large-capacity battery respectively;
and detecting whether the battery which is not fully charged exists or not, and selecting a charging current corresponding to the electric quantity and the voltage of the battery which is not fully charged according to the electric quantity and the voltage of the battery which is not fully charged to charge the battery which is not fully charged until the charging is finished.
Further, the charging method further includes:
disconnecting the charging loop of the small-capacity battery after the small-capacity battery is fully charged;
and when the large-capacity battery is fully charged, disconnecting the charging loop of the large-capacity battery.
Further, the converting the charging modes for the small-capacity battery and the large-capacity battery according to the cell voltage value of the small-capacity battery and the cell voltage value of the large-capacity battery respectively includes:
carrying out constant current charging on the small-capacity battery and the large-capacity battery;
judging whether the small-capacity battery reaches a constant voltage conversion point or not according to the detected cell voltage value of the small-capacity battery, converting the charging mode of the small-capacity battery from constant current charging to constant voltage charging when the small-capacity battery reaches the voltage conversion point, and slowing down the charging speed;
continuously performing constant-current charging on the high-capacity battery until the cell voltage of the high-capacity battery reaches a constant-voltage conversion point; and when the large-capacity battery reaches a voltage conversion point, converting the charging mode of the large-capacity battery from constant-current charging to constant-voltage charging.
Further, the process of slowing down the charging speed includes:
when the small-capacity battery is switched to constant voltage charging, the electric quantity values of the small-capacity battery and the large-capacity battery are compared in real time,
when the electric quantity value of the small-capacity battery is larger than that of the large-capacity battery, adjusting the constant-voltage charging voltage of the small-capacity battery;
and reducing the charging voltage of the small-capacity battery in the constant-voltage charging stage, reducing the charging speed of the small-capacity battery, and enabling the charging speed of the small-capacity battery to be equal to that of the large-capacity battery until the small-capacity battery is charged.
Further, the charging method determines the charging rate of the small-capacity battery and the large-capacity battery in the constant current charging stage by using formula (1), wherein the formula (1) is as follows:
wherein S is1Represents the charging rate of the small-capacity battery in the constant-current charging stage, S2Indicating the large-capacity batteryCharging rate in the constant-current charging phase, Qa1And Qa2Respectively representing the charge accumulation amounts of the small-capacity battery and the large-capacity battery in a constant current charging stage; t is t1And t2Respectively representing the constant current charging time of the small-capacity battery and the large-capacity battery; qb1And Qb2Respectively representing the charge increment of the small-capacity battery and the large-capacity battery in the constant-voltage charging stage; qc1And Qc2Respectively representing nominal capacities of the small-capacity battery and the large-capacity battery; SOC1And SOC2Respectively representing the charge states of the small-capacity battery and the large-capacity battery.
A charging system for parallel batteries, the charging system charging batteries of different capacities in parallel, the charging system comprising:
the first electricity meter is used for detecting the cell voltage value of a small-capacity battery in the parallel batteries with different capacities;
the second ammeter is used for detecting the cell voltage value of a high-capacity battery in the parallel batteries with different capacities;
the charging device is used for converting the charging modes of the small-capacity battery and the large-capacity battery according to the cell voltage value of the small-capacity battery and the cell voltage value of the large-capacity battery respectively;
and the integrated power management circuit is used for detecting whether the battery which is not fully charged exists or not, and selecting charging current corresponding to the electric quantity and the voltage of the battery which is not fully charged according to the electric quantity and the voltage of the battery which is not fully charged to charge the battery which is not fully charged until the charging is finished.
Further, the charging system further includes:
the first MOS tube is used for disconnecting a charging loop of the small-capacity battery after the small-capacity battery is fully charged;
and the second MOS tube is used for disconnecting the charging loop of the large-capacity battery after the large-capacity battery is fully charged.
Further, the charging device includes:
the constant current charging circuit is used for performing constant current charging on the small-capacity battery and the large-capacity battery;
the charging mode conversion circuit of the small-capacity battery is used for judging whether the small-capacity battery reaches a constant voltage conversion point or not according to the cell voltage value of the small-capacity battery detected by the first fuel gauge, converting the charging mode of the small-capacity battery from constant current charging into constant voltage charging when the small-capacity battery reaches the voltage conversion point, and slowing down the charging speed;
the high-capacity battery charging mode conversion circuit is used for continuously carrying out constant-current charging on the high-capacity battery until the second fuel gauge detects that the cell voltage of the high-capacity battery reaches a constant-voltage conversion point; and when the large-capacity battery reaches a voltage conversion point, converting the charging mode of the large-capacity battery from constant-current charging to constant-voltage charging.
Further, the charging device further includes:
the electric quantity comparison circuit is used for comparing the electric quantity values detected by the first electric quantity meter and the second electric quantity meter in real time when the low-capacity battery is switched to constant-voltage charging,
the control circuit is used for controlling the charging voltage adjusting circuit of the small-capacity battery to adjust the charging speed of the small-capacity battery when the electric quantity value detected by the first electric quantity meter is larger than the electric quantity value detected by the second electric quantity meter;
the charging voltage adjusting circuit of the small-capacity battery is used for reducing the charging voltage of the small-capacity battery in a constant voltage charging stage, reducing the charging speed of the small-capacity battery and enabling the charging speed of the small-capacity battery to be equal to the charging speed of the large-capacity battery until the small-capacity battery is charged.
Further, the charging system determines the charging rate of the small-capacity battery and the large-capacity battery in the constant current charging stage by using formula (1), wherein the formula (1) is as follows:
wherein S is1Indicating that the small-capacity battery is at a constant currentCharging multiplying factor of charging stage, S2Represents the charging rate, Q, of the large-capacity battery in the constant-current charging stagea1And Qa2Respectively representing the charge accumulation amounts of the small-capacity battery and the large-capacity battery in a constant current charging stage; t is t1And t2Respectively representing the constant current charging time of the small-capacity battery and the large-capacity battery; qb1And Qb2Respectively representing the charge increment of the small-capacity battery and the large-capacity battery in the constant-voltage charging stage; qc1And Qc2Respectively representing nominal capacities of the small-capacity battery and the large-capacity battery; SOC1And SOC2Respectively representing the charge states of the small-capacity battery and the large-capacity battery.
The invention has the beneficial effects that:
the invention aims to solve the problems that when two batteries which are made of the same materials, systems, sizes and charging multiplying powers are connected in parallel in the prior mobile phone or tablet personal computer, the battery space is not favorably exerted, the integral aging speed of the battery pack is accelerated, the service life of the battery and the user experience are influenced, the safety of the battery exists and the like; the charging method and the charging system of the parallel batteries can detect the health state of the batteries in real time, fully charge a charge forbidding protection mechanism, ensure the use safety of the batteries and prolong the service life of the batteries, can simultaneously exert the capacity and the shape of the batteries according to the interface space of the whole machine, can completely have different capacities and shapes, and can ensure the synchronous charging of the two batteries under the condition that the capacities and the systems of the batteries are completely different.
Drawings
Fig. 1 is a structural view of a conventional charging system according to the present invention;
fig. 2 is an internal structure diagram of a single battery of a second conventional charging system according to the present invention;
FIG. 3 is a diagram of a parallel connection of two batteries of a second conventional charging system according to the present invention;
FIG. 4 is a flow chart of a charging method according to the present invention;
FIG. 5 is a block diagram of the charging system of the present invention;
FIG. 6 is a schematic diagram of a charging device according to the present invention;
(1, a small-capacity battery; 2, a large-capacity battery; 3, a first fuel gauge; 4, a second fuel gauge, 5, a first MOS (metal oxide semiconductor) transistor; 6, a second MOS transistor; 7, a first switch S4; 8, a second switch S3; 9, a signal terminal interface plug board shared by the charging device and the integrated power management circuit).
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The invention provides a charging method and a charging system for parallel batteries, which are used for solving the problem that the parallel batteries with different capacities and different chemical systems are not synchronously charged in a quick charging process.
A charging method for parallel batteries, as shown in fig. 4, the charging method is used for charging parallel batteries with different capacities, and the charging method comprises:
s1, detecting the cell voltage value of a small-capacity battery in the parallel batteries with different capacities;
s2, detecting the cell voltage value of a large-capacity battery in the parallel batteries with different capacities;
s3, converting the charging modes of the small-capacity battery and the large-capacity battery according to the cell voltage value of the small-capacity battery and the cell voltage value of the large-capacity battery respectively;
and S4, detecting whether the battery is not fully charged or not, and selecting a charging current corresponding to the electric quantity and the voltage of the battery to charge the battery until the charging is finished according to the electric quantity and the voltage of the battery.
The working principle of the scheme is as follows: firstly, detecting the cell voltage values of a small-capacity battery and a large-capacity battery in the parallel batteries with different capacities; then, converting the charging modes of the small-capacity battery and the large-capacity battery according to the cell voltage value of the small-capacity battery and the cell voltage value of the large-capacity battery respectively, wherein the conversion of the charging mode is from a constant-current charging mode to a constant-voltage charging mode; and finally, detecting whether the battery which is not fully charged exists or not, and selecting a charging current corresponding to the electric quantity and the voltage of the battery which is not fully charged according to the electric quantity and the voltage of the battery which is not fully charged to charge the battery which is not fully charged until the charging is finished.
The technical effects of the scheme are as follows: in order to solve the problems that when two batteries which are made of the same materials, systems, sizes and charging multiplying powers are connected in parallel in the conventional mobile phone or tablet personal computer, the battery space is not favorably exerted, the overall aging speed of a battery pack is accelerated, the service life of the battery and the user experience are influenced, the safety of the battery exists and the like, the battery form in the mobile phone or tablet personal computer is changed into the parallel connection of the two batteries which are made of different electric capacities, chemical systems, charging multiplying powers and impedance paths; the charging method of the parallel batteries can detect the health state of the batteries in real time, fully charge a charge forbidding protection mechanism, ensure the use safety of the batteries and prolong the service life of the batteries, can play the roles of the capacity and the shape of the batteries according to the interface space of the whole machine, can be completely different in the capacity and the shape, and can ensure that the two batteries are synchronously charged under the condition that the capacity and the system of the batteries are completely different.
In an embodiment of the present invention, the charging method further includes:
disconnecting the charging loop of the small-capacity battery after the small-capacity battery is fully charged;
and when the large-capacity battery is fully charged, disconnecting the charging loop of the large-capacity battery.
The working principle of the scheme is as follows: after the small-capacity battery and the large-capacity battery are charged successively, the charging loops corresponding to the small-capacity battery and the large-capacity battery are disconnected after the small-capacity battery and the large-capacity battery are fully charged.
The technical effects of the scheme are as follows: and overcharge of a large-capacity battery and a small-capacity battery and safety risks caused by overcharge of the batteries are prevented.
In an embodiment of the present invention, the converting the charging modes for the small-capacity battery and the large-capacity battery according to the cell voltage value of the small-capacity battery and the cell voltage value of the large-capacity battery, respectively, includes:
s301, performing constant current charging on the small-capacity battery and the large-capacity battery;
s302, judging whether the small-capacity battery reaches a constant voltage conversion point or not according to the detected cell voltage value of the small-capacity battery, and when the small-capacity battery reaches the voltage conversion point, converting the charging mode of the small-capacity battery from constant current charging to constant voltage charging and slowing down the charging speed;
s303, continuously carrying out constant-current charging on the high-capacity battery until the cell voltage of the high-capacity battery reaches a constant-voltage conversion point; and when the large-capacity battery reaches a voltage conversion point, converting the charging mode of the large-capacity battery from constant-current charging to constant-voltage charging.
The working principle of the scheme is as follows: in the first section of constant Current Charging (CC) process, a large-capacity battery and a small-capacity battery are charged simultaneously, whether the small-capacity battery reaches a constant voltage conversion point or not is judged by detecting the cell voltage of the small-capacity battery, and when the small-capacity battery reaches the conversion point, the charging mode of the small-capacity battery is converted from constant current charging to constant voltage charging. When the low-capacity battery reaches a first CV (constant current charging) to constant voltage charging point, the high-capacity battery does not reach the CV point, and the charging speed of the low-capacity battery is reduced; and finally, selecting proper charging current by using the PMIC according to the electric quantity and the voltage of the battery which is not fully charged until the charging is finished.
The technical effects of the scheme are as follows: the method comprises the steps of dynamically adjusting a charging mode CC/CV according to the charge state of a battery, realizing synchronous charging of the two batteries with different capacities and systems in the charging process, simultaneously detecting the health states of the batteries in real time by using a first electricity meter and a second electricity meter, and starting a full charge forbidding protection mechanism when the two batteries reach the full charge state, thereby ensuring the use safety of the batteries and prolonging the service life of the batteries.
In one embodiment of the present invention, the process of slowing down the charging speed comprises:
s3021, comparing the electric quantity values of the small-capacity battery and the large-capacity battery in real time when the small-capacity battery is switched to constant voltage charging,
s3022, when the electric quantity value of the small-capacity battery is larger than that of the large-capacity battery, adjusting the constant-voltage charging voltage of the small-capacity battery;
and S3023, reducing the charging voltage of the small-capacity battery in the constant-voltage charging stage, and reducing the charging speed of the small-capacity battery to enable the charging speed of the small-capacity battery to be equal to that of the large-capacity battery until the small-capacity battery is charged.
The working principle of the scheme is as follows: the charging speed of the small-capacity battery is adjusted by adjusting the charging voltage at two ends of the constant-voltage charging stage of the small-capacity battery, and the charging speed of the small-capacity battery is always kept consistent with that of the large-capacity battery when the large-capacity battery is still in a constant-current charging mode and the small-capacity battery enters a constant-voltage charging state.
The technical effects of the scheme are as follows: when the large-capacity battery and the small-capacity battery are in different charging modes, the synchronous charging between the small-capacity battery and the large-capacity battery is still strictly kept, the phenomenon of asynchronous charging when the small-capacity battery and the large-capacity battery are in different charging modes is prevented, the charging synchronism of the large-capacity battery and the small-capacity battery is further improved, the two batteries with completely different capacities and systems can be kept in complete synchronous charging no matter which charging stage is in, the aging of the batteries is effectively prevented, and the service life of the batteries is prolonged.
In an embodiment of the present invention, the charging method determines the charging rates of the small-capacity battery and the large-capacity battery in the constant current charging stage by using formula (1), where the formula (1) is as follows:
wherein S is1Represents the charging rate of the small-capacity battery in the constant-current charging stage, S2Represents the charging rate, Q, of the large-capacity battery in the constant-current charging stagea1And Qa2Respectively representing the charge accumulation amounts of the small-capacity battery and the large-capacity battery in a constant current charging stage; t is t1And t2Respectively representing the constant current charging time of the small-capacity battery and the large-capacity battery; qb1And Qb2Respectively representing the charge increment of the small-capacity battery and the large-capacity battery in the constant-voltage charging stage; qc1And Qc2Respectively representing nominal capacities of the small-capacity battery and the large-capacity battery; SOC1And SOC2Respectively representing the charge states of the small-capacity battery and the large-capacity battery.
The working principle of the scheme is as follows: and calculating the charge multiplying power of the large-capacity battery and the small-capacity battery in the constant current charging stage by using the parameters such as the charge accumulation amount in the constant current charging stage, the constant current charging time, the charge increment in the constant voltage charging stage, the charge state of the battery and the like.
The technical effects of the scheme are as follows: the initial charging multiplying power is determined, the electric quantity monitoring of the first subsequent electricity meter and the second subsequent electricity meter and the change of the charging multiplying power of the different subsequent charging stages are combined, so that the large and small capacity batteries in different stages can be guaranteed to be always kept in charging synchronization, and the instantaneous electric quantity difference between the large and small capacity batteries after the large and small capacity batteries have charging electric quantity difference and before the small capacity batteries slow down the charging speed can be effectively reduced, so that the batteries are further prevented from aging, and the service life of the batteries is prolonged.
A charging system for parallel batteries, as shown in fig. 5, the charging system charges parallel batteries with different capacities, the charging system comprising:
the first electricity meter 3 is used for detecting the cell voltage value of a small-capacity battery 1 in the parallel batteries with different capacities;
the second electricity meter 4 is used for detecting the cell voltage value of a large-capacity battery 2 in the parallel batteries with different capacities;
the charging device is used for converting the charging modes of the small-capacity battery 1 and the large-capacity battery 2 according to the cell voltage value of the small-capacity battery 1 and the cell voltage value of the large-capacity battery 2 respectively;
and the integrated power management circuit is used for detecting whether the battery which is not fully charged exists or not, and selecting charging current corresponding to the electric quantity and the voltage of the battery which is not fully charged according to the electric quantity and the voltage of the battery which is not fully charged to charge the battery which is not fully charged until the charging is finished.
The first MOS tube 5 is used for disconnecting a charging loop of the small-capacity battery 1 after the small-capacity battery 1 is fully charged;
and the second MOS tube 6 is used for disconnecting the charging loop of the large-capacity battery 2 after the large-capacity battery 2 is fully charged.
In this embodiment, the first ports of the first and second fuel gauges 3 and 4 are both connected to the SDA port of the charging device, and the second ports of the first and second fuel gauges 3 and 4 are both connected to the SCL port of the charging device; the third ports of the first and second electricity meters 3 and 4 are respectively connected with the grids of the first and second MOS transistors 5 and 6; the drain electrode of the first MOS tube 5 is connected with the anode of the small-capacity battery 1, and the drain electrode of the second MOS tube 6 is connected with the anode of the large-capacity battery 2; the source electrodes of the first MOS tube 5 and the second MOS tube 6 are connected with the positive electrodes of the charging device and the integrated power management circuit through a signal end interface plug board 9 shared by the charging device and the integrated power management circuit; the negative pole of the small-capacity battery 1 is connected with the negative poles of the charging device and the integrated power management circuit through a resistor and a first switch S47 through a signal terminal interface plug board 9 shared by the charging device and the integrated power management circuit; the negative pole of the large-capacity battery 2 is connected with the negative poles of the charging device and the integrated power management circuit through a resistor and a second switch S38 through a signal terminal interface plug board 9 shared by the charging device and the integrated power management circuit.
The working principle of the scheme is as follows: firstly, cell voltage values of a small-capacity battery 1 and a large-capacity battery 2 in the parallel batteries with different capacities are respectively detected by a first fuel gauge 3 and a second fuel gauge 4; then, respectively switching the charging modes of the small-capacity battery 1 and the large-capacity battery 2 according to the cell voltage value of the small-capacity battery 1 and the cell voltage value of the large-capacity battery 2 by using a charging device, wherein the switching of the charging modes is from a constant-current charging mode to a constant-voltage charging mode; and finally, detecting whether the battery which is not fully charged exists through the integrated power management circuit, and selecting a charging current corresponding to the electric quantity and the voltage of the battery which is not fully charged according to the electric quantity and the voltage of the battery which is not fully charged to charge the battery which is not fully charged until the charging is finished. Meanwhile, after the small-capacity battery 1 and the large-capacity battery 2 are charged successively, the charging loops corresponding to the small-capacity battery 1 and the large-capacity battery 2 are disconnected respectively by disconnecting the first MOS tube 5 and the second MOS tube 6 after the small-capacity battery 1 and the large-capacity battery 2 are fully charged.
The technical effects of the scheme are as follows: in order to solve the problems that when two batteries which are made of the same materials, systems, sizes and charging multiplying powers are connected in parallel in the conventional mobile phone or tablet personal computer, the battery space is not favorably exerted, the overall aging speed of a battery pack is accelerated, the service life of the battery and the user experience are influenced, the safety of the battery exists and the like, the battery form in the mobile phone or tablet personal computer is changed into the parallel connection of the two batteries which are made of different electric capacities, chemical systems, charging multiplying powers and impedance paths; the charging system of the parallel batteries can detect the health state of the batteries in real time, fully charge a charge forbidding protection mechanism, ensure the use safety of the batteries and prolong the service life of the batteries, simultaneously, the capacity and the shape of the batteries can be exerted according to the interface space of the whole machine, the capacity and the shape can be completely different, and the two batteries can be ensured to be synchronously charged under the condition that the capacity and the system of the batteries are completely different. In addition, the first MOS tube 5 and the second MOS tube 6 can effectively prevent the overcharge of the large-capacity battery 2 and the small-capacity battery 1 and the safety risk caused by the overcharge of the batteries.
In an embodiment of the present invention, as shown in fig. 6, the charging device includes:
the constant current charging circuit is used for performing constant current charging on the small-capacity battery and the large-capacity battery;
the charging mode conversion circuit of the small-capacity battery is used for judging whether the small-capacity battery reaches a constant voltage conversion point or not according to the cell voltage value of the small-capacity battery detected by the first fuel gauge, converting the charging mode of the small-capacity battery from constant current charging into constant voltage charging when the small-capacity battery reaches the voltage conversion point, and slowing down the charging speed;
the high-capacity battery charging mode conversion circuit is used for continuously carrying out constant-current charging on the high-capacity battery until the second fuel gauge detects that the cell voltage of the high-capacity battery reaches a constant-voltage conversion point; and when the large-capacity battery reaches a voltage conversion point, converting the charging mode of the large-capacity battery from constant-current charging to constant-voltage charging.
The working principle of the scheme is as follows: in the first section of constant Current Charging (CC) process, a constant current charging circuit is used for simultaneously carrying out constant current charging on a large-capacity battery and a small-capacity battery, a first fuel gauge is used for detecting the cell voltage of the small-capacity battery to judge whether the small-capacity battery reaches a constant voltage conversion point, when the small-capacity battery firstly reaches the conversion point of changing from constant current charging to constant voltage charging, a small-electric-quantity battery charging mode conversion module is used for converting the charging mode of the small-capacity battery from constant current charging to constant voltage charging, at the moment, the small-capacity battery firstly reaches the first constant current charging CC to constant voltage charging CV conversion point, and the large-capacity battery does not reach the constant current charging CC to constant voltage charging CV conversion point, so that the constant voltage charging speed of the small-capacity battery is reduced, and the large. The high-capacity battery continues to perform CC (charge control) until the cell voltage of the high-capacity battery reaches a CV (constant voltage) point because the voltage of the high-capacity battery does not reach a voltage conversion point, and at the moment, the battery capacity is basically synchronous; and finally, selecting proper charging current by using the PMIC according to the electric quantity and the voltage of the battery which is not fully charged until the charging is finished.
The technical effects of the scheme are as follows: the method comprises the steps of dynamically adjusting a charging mode CC/CV according to the charge state of a battery, realizing synchronous charging of the two batteries with different capacities and systems in the charging process, simultaneously detecting the health states of the batteries in real time by using a first electricity meter and a second electricity meter, and starting a full charge forbidding protection mechanism when the two batteries reach the full charge state, thereby ensuring the use safety of the batteries and prolonging the service life of the batteries.
In an embodiment of the present invention, as shown in fig. 6, the charging device further includes:
the electric quantity comparison circuit is used for comparing the electric quantity values detected by the first electric quantity meter and the second electric quantity meter in real time when the low-capacity battery is switched to constant-voltage charging,
the control circuit is used for controlling the charging voltage adjusting circuit of the small-capacity battery to adjust the charging speed of the small-capacity battery when the electric quantity value detected by the first electric quantity meter is larger than the electric quantity value detected by the second electric quantity meter;
the charging voltage adjusting circuit of the small-capacity battery is used for reducing the charging voltage of the small-capacity battery in a constant voltage charging stage, reducing the charging speed of the small-capacity battery and enabling the charging speed of the small-capacity battery to be equal to the charging speed of the large-capacity battery until the small-capacity battery is charged.
The working principle of the scheme is as follows: the charging speed of the small-capacity battery is adjusted by adjusting the charging voltage at two ends of the constant-voltage charging stage of the small-capacity battery, and the charging speed of the small-capacity battery is always kept consistent with that of the large-capacity battery when the large-capacity battery is still in a constant-current charging mode and the small-capacity battery enters a constant-voltage charging state.
The technical effects of the scheme are as follows: when the large-capacity battery and the small-capacity battery are in different charging modes, the synchronous charging between the small-capacity battery and the large-capacity battery is still strictly kept, the phenomenon of asynchronous charging when the small-capacity battery and the large-capacity battery are in different charging modes is prevented, the charging synchronism of the large-capacity battery and the small-capacity battery is further improved, the two batteries with completely different capacities and systems can be kept in complete synchronous charging no matter which charging stage is in, the aging of the batteries is effectively prevented, and the service life of the batteries is prolonged.
In an embodiment of the present invention, the charging system determines the charging rates of the small-capacity battery and the large-capacity battery in the constant current charging stage by using formula (1), where the formula (1) is as follows:
wherein S is1Represents the charging rate of the small-capacity battery in the constant-current charging stage, S2Represents the charging rate, Q, of the large-capacity battery in the constant-current charging stagea1And Qa2Respectively representing the charge accumulation amounts of the small-capacity battery and the large-capacity battery in a constant current charging stage; t is t1And t2Respectively representing the constant current charging time of the small-capacity battery and the large-capacity battery; qb1And Qb2Respectively representing the charge increment of the small-capacity battery and the large-capacity battery in the constant-voltage charging stage; qc1And Qc2Respectively representing nominal capacities of the small-capacity battery and the large-capacity battery; SOC1And SOC2Respectively representing the charge states of the small-capacity battery and the large-capacity battery.
The working principle of the scheme is as follows: and calculating the charge multiplying power of the large-capacity battery and the small-capacity battery in the constant current charging stage by using the parameters such as the charge accumulation amount in the constant current charging stage, the constant current charging time, the charge increment in the constant voltage charging stage, the charge state of the battery and the like.
The technical effects of the scheme are as follows: the initial charging multiplying power is determined, the electric quantity monitoring of the first subsequent electricity meter and the second subsequent electricity meter and the change of the charging multiplying power of the different subsequent charging stages are combined, so that the large and small capacity batteries in different stages can be guaranteed to be always kept in charging synchronization, and the instantaneous electric quantity difference between the large and small capacity batteries after the large and small capacity batteries have charging electric quantity difference and before the small capacity batteries slow down the charging speed can be effectively reduced, so that the batteries are further prevented from aging, and the service life of the batteries is prolonged.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A charging method for parallel batteries, which is characterized in that the charging method is used for charging parallel batteries with different capacities, and the charging method comprises the following steps:
detecting the cell voltage value of a small-capacity battery in the parallel batteries with different capacities;
detecting the cell voltage value of a high-capacity battery in the parallel batteries with different capacities;
converting the charging modes of the small-capacity battery and the large-capacity battery according to the cell voltage value of the small-capacity battery and the cell voltage value of the large-capacity battery respectively;
and detecting whether the battery which is not fully charged exists or not, and selecting a charging current corresponding to the electric quantity and the voltage of the battery which is not fully charged according to the electric quantity and the voltage of the battery which is not fully charged to charge the battery which is not fully charged until the charging is finished.
2. The charging method according to claim 1, further comprising:
disconnecting the charging loop of the small-capacity battery after the small-capacity battery is fully charged;
and when the large-capacity battery is fully charged, disconnecting the charging loop of the large-capacity battery.
3. The charging method according to claim 1, wherein the switching the charging modes for the small-capacity battery and the large-capacity battery according to the cell voltage value of the small-capacity battery and the cell voltage value of the large-capacity battery, respectively, comprises:
carrying out constant current charging on the small-capacity battery and the large-capacity battery;
judging whether the small-capacity battery reaches a constant voltage conversion point or not according to the detected cell voltage value of the small-capacity battery, converting the charging mode of the small-capacity battery from constant current charging to constant voltage charging when the small-capacity battery reaches the voltage conversion point, and slowing down the charging speed;
continuously performing constant-current charging on the high-capacity battery until the cell voltage of the high-capacity battery reaches a constant-voltage conversion point; and when the large-capacity battery reaches a voltage conversion point, converting the charging mode of the large-capacity battery from constant-current charging to constant-voltage charging.
4. The charging method according to claim 3, wherein the process of slowing down the charging speed comprises:
when the small-capacity battery is switched to constant voltage charging, the electric quantity values of the small-capacity battery and the large-capacity battery are compared in real time,
when the electric quantity value of the small-capacity battery is larger than that of the large-capacity battery, adjusting the constant-voltage charging voltage of the small-capacity battery;
and reducing the charging voltage of the small-capacity battery in the constant-voltage charging stage, reducing the charging speed of the small-capacity battery, and enabling the charging speed of the small-capacity battery to be equal to that of the large-capacity battery until the small-capacity battery is charged.
5. The charging method according to claim 1, wherein the charging method determines the charging rate of the small-capacity battery and the large-capacity battery in a constant current charging phase by using formula (1), wherein the formula (1) is as follows:
wherein S is1Represents the charging rate of the small-capacity battery in the constant-current charging stage, S2Represents the charging rate, Q, of the large-capacity battery in the constant-current charging stagea1And Qa2Respectively representing the charge accumulation amounts of the small-capacity battery and the large-capacity battery in a constant current charging stage; t is t1And t2Respectively representing the constant current charging time of the small-capacity battery and the large-capacity battery; qb1And Qb2Respectively representing the charge increment of the small-capacity battery and the large-capacity battery in the constant-voltage charging stage; qc1And Qc2Respectively representing nominal capacities of the small-capacity battery and the large-capacity battery; SOC1And SOC2Respectively representing the charge states of the small-capacity battery and the large-capacity battery.
6. A charging system for parallel batteries, the charging system charging batteries of different capacities, the charging system comprising:
the first electricity meter is used for detecting the cell voltage value of a small-capacity battery in the parallel batteries with different capacities;
the second ammeter is used for detecting the cell voltage value of a high-capacity battery in the parallel batteries with different capacities;
the charging device is used for converting the charging modes of the small-capacity battery and the large-capacity battery according to the cell voltage value of the small-capacity battery and the cell voltage value of the large-capacity battery respectively;
and the integrated power management circuit is used for detecting whether the battery which is not fully charged exists or not, and selecting charging current corresponding to the electric quantity and the voltage of the battery which is not fully charged according to the electric quantity and the voltage of the battery which is not fully charged to charge the battery which is not fully charged until the charging is finished.
7. The charging system of claim 6, further comprising:
the first MOS tube is used for disconnecting a charging loop of the small-capacity battery after the small-capacity battery is fully charged;
and the second MOS tube is used for disconnecting the charging loop of the large-capacity battery after the large-capacity battery is fully charged.
8. The charging system according to claim 6, wherein the charging device comprises:
the constant current charging circuit is used for performing constant current charging on the small-capacity battery and the large-capacity battery;
the charging mode conversion circuit of the small-capacity battery is used for judging whether the small-capacity battery reaches a constant voltage conversion point or not according to the cell voltage value of the small-capacity battery detected by the first fuel gauge, converting the charging mode of the small-capacity battery from constant current charging into constant voltage charging when the small-capacity battery reaches the voltage conversion point, and slowing down the charging speed;
the high-capacity battery charging mode conversion circuit is used for continuously carrying out constant-current charging on the high-capacity battery until the second fuel gauge detects that the cell voltage of the high-capacity battery reaches a constant-voltage conversion point; and when the large-capacity battery reaches a voltage conversion point, converting the charging mode of the large-capacity battery from constant-current charging to constant-voltage charging.
9. The charging system of claim 8, wherein the charging device further comprises:
the electric quantity comparison circuit is used for comparing the electric quantity values detected by the first electric quantity meter and the second electric quantity meter in real time when the low-capacity battery is switched to constant-voltage charging,
the control circuit is used for controlling the charging voltage adjusting circuit of the small-capacity battery to adjust the charging speed of the small-capacity battery when the electric quantity value detected by the first electric quantity meter is larger than the electric quantity value detected by the second electric quantity meter;
the charging voltage adjusting circuit of the small-capacity battery is used for reducing the charging voltage of the small-capacity battery in a constant voltage charging stage, reducing the charging speed of the small-capacity battery and enabling the charging speed of the small-capacity battery to be equal to the charging speed of the large-capacity battery until the small-capacity battery is charged.
10. The charging system according to claim 6, wherein the charging system determines the charging rate of the small-capacity battery and the large-capacity battery in the constant current charging phase by using formula (1), wherein the formula (1) is as follows:
wherein S is1Represents the charging rate of the small-capacity battery in the constant-current charging stage, S2Represents the charging rate, Q, of the large-capacity battery in the constant-current charging stagea1And Qa2Respectively representing the charge accumulation amounts of the small-capacity battery and the large-capacity battery in a constant current charging stage; t is t1And t2Respectively representing the constant current charging time of the small-capacity battery and the large-capacity battery; qb1And Qb2Respectively representing the charge increment of the small-capacity battery and the large-capacity battery in the constant-voltage charging stage; qc1And Qc2Respectively representing nominal capacities of the small-capacity battery and the large-capacity battery; SOC1And SOC2Respectively representing the charge states of the small-capacity battery and the large-capacity battery.
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| US11476698B1 (en) * | 2021-08-09 | 2022-10-18 | Shenzhen Lowpower Semiconductor Co., Ltd. | System for charging small-capacity battery from large-capacity battery |
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