CN110970677A - Battery equalizing charging method and system - Google Patents
Battery equalizing charging method and system Download PDFInfo
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- CN110970677A CN110970677A CN201911356415.1A CN201911356415A CN110970677A CN 110970677 A CN110970677 A CN 110970677A CN 201911356415 A CN201911356415 A CN 201911356415A CN 110970677 A CN110970677 A CN 110970677A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/4285—Testing apparatus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0019—Circuits for equalisation of charge between batteries using switched or multiplexed charge circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The invention discloses a battery equalizing charge system, and relates to the technical field of battery charging. The technical key points of the method comprise that whether a battery exists in a battery interface is detected in sequence, and a charging branch with the battery interface is recorded as a working branch; starting a charging switch of the working branch, leading the charging current to the working branch, sequentially obtaining the charging current values of the working branch, and adding to obtain the total charging current value; comparing the obtained charging current sum value with the multiple of the rated current value of a single battery one by one to obtain the maximum multiple value smaller than the charging current sum value as the polling charging quantity; performing polling charging on the working branch; wherein the polling charging includes: and starting the work branches with the polling charging quantity, and replacing the started work branches after a preset polling time length so that the charging time lengths of all the work branches after a plurality of polling time lengths are equal. The invention has the advantage of equalizing charge of the battery when the current is insufficient.
Description
Technical Field
The invention relates to the technical field of battery charging, in particular to a battery equalizing charging method and system.
Background
The battery charger is suitable for equipment for charging rechargeable batteries, and the existing battery charger generally has a plurality of charging grooves which can charge a plurality of batteries simultaneously. With the popularization of the USB interface, most power lines adopt the USB interface as an access to supply power to the battery charger.
At present, although the voltage of the existing charging connector for connecting the USB is 5V, the voltage is different in output current, for example, the current output by the fast charging connector is 2A, the current output by the slow charging connector is 1A, and the USB output current on a part of computers is only 0.5A.
In the charging system of the current battery charger, a charging IC chip is correspondingly arranged in each charging slot, when the charging current is smaller than the charging rated current, the charging IC chips cannot reach the maximum charging current, and in this case, the charging current is not uniformly distributed to each charging IC but is randomly distributed to each charging IC, so that the current value output by each charging IC has randomness in the situation, the charging time of the battery charged in the charging system is uneven, part of the batteries are particularly quickly charged, and part of the batteries are particularly slowly charged; affecting the use experience of the customer.
Disclosure of Invention
In view of the above-mentioned problems, it is a first object of the present invention to provide a method for equalizing charge of a battery, which has the advantage of equalizing charge.
In order to achieve the purpose, the invention provides the following technical scheme: a battery equalizing charge method is characterized in that:
sequentially detecting whether a battery exists in the battery interface, and recording a charging branch with the battery interface as a working branch;
starting a charging switch of the working branch, leading the charging current to the working branch, sequentially obtaining the charging current values of the working branch, and adding to obtain the total charging current value;
comparing the obtained charging current sum value with the multiple of the rated current value of a single battery one by one to obtain the maximum multiple value smaller than the charging current sum value as the polling charging quantity;
performing polling charging on the working branch;
wherein the polling charging includes:
and starting the work branches with the polling charging quantity, and replacing the started work branches after a preset polling time length so that the charging time lengths of all the work branches after a plurality of polling time lengths are equal.
By adopting the technical scheme, only the batteries of polling charging quantity are charged, and even if each charging branch in polling charging is in the battery rated current value, the charging branch is smaller than the charging current sum value accessed by the USB interface, so that the charging current of the charging circuit in polling charging can be ensured to be in the stable battery rated current value. And then, the time is evenly distributed to all the working branches in a polling mode, so that the charging time of all the working branches is equal. And under the condition that the charging current values and the charging time durations of all the working branches are equal, the charging speeds of all the batteries are also equal to reach the same level. The situations that the current is insufficient and the charging time of the battery is too different are avoided.
The invention is further configured to: replacing the opened working branch comprises:
closing the working branch in the opening state;
starting working branches of polling charging quantity;
wherein, the work branch road of opening polling charge quantity includes:
sequencing the working branches one by one to form working serial numbers;
acquiring the working sequence number of the last opened working branch;
moving the last working sequence number in sequence in the same direction by one sequence number to obtain a working sequence number to be started;
and starting the working branch corresponding to the working serial number to be started.
By adopting the technical scheme, the number of the working branches is 5, and the polling charging number is 3. We will label the five working branches with 1, 2, 3, 4, 5, respectively, one sequence number at a time. The first polling duration will be on 1, 2, 3 and the second polling duration will be 2, 3, 4. The third polling duration we will turn on 3, 4, 5, and so on, so that after 5 polling durations, all working branches are charged for 3 polling durations. Uniform charging of all the cells is achieved.
The invention is further configured to: closing the working branch in the opening state;
starting working branches of polling charging quantity;
wherein, the work branch road of opening polling charge quantity includes:
sequencing the working branches one by one to form working serial numbers;
acquiring the working sequence number of the last opened working branch;
sequentially and equidirectionally moving the last working serial number by the serial number equal to the polling charging number to obtain the working serial number to be started;
and starting the working branch corresponding to the working serial number to be started.
By adopting the technical scheme, the number of the working branches is 5, and the polling charging number is 3. We will index the five working branches to 1, 2, 3, 4, 5, respectively, with 3 serial numbers shifted each time. The first polling duration will be on 1, 2, 3 and the second polling duration will be 4, 5, 1. The third polling duration we will turn on 2, 3, 4, and so on, so after 5 polling durations, all working legs are charged for 3 polling durations. Uniform charging of all the cells is achieved.
The invention is further configured to: the polling duration is set to 1 to 2 seconds.
By adopting the technical scheme, the polling time of 1-2 seconds is not too short or too long, and the electric quantity charged for the battery at each time is avoided from being too large in difference.
The invention is further configured to: whether a battery exists in the battery interface is detected based on the node voltage value on the charging branch.
Through adopting above-mentioned technical scheme, through the mode direct detection of measuring voltage whether have the battery, can play short-term test and low-cost effect.
The invention is further configured to: further comprising: the method comprises the steps of obtaining input power supply voltage, judging whether the input voltage is within a preset safe voltage value, if not, cutting off current input into a charging branch, and if so, sequentially detecting whether a battery exists in a battery interface.
By adopting the technical scheme, whether the voltage is normal or not is judged firstly before charging, if the voltage is abnormal, charging is not started, and damage to the battery is avoided.
The second purpose of the invention is to provide a battery equalizing charge system which has the advantage of equalizing charge.
In order to achieve the purpose, the invention provides the following technical scheme: a battery equalizing charge system applied to the method of the first purpose comprises a power supply module, an MCU controller, a current master control module and a plurality of charge modules;
the input end of the power supply module is connected with an external USB interface to obtain a power supply output by the USB interface, and the output end of the power supply module is connected to the input end of the current master control module to enable the current master control module to receive the current output from the power supply module;
the output end of the current master control module is respectively connected with the plurality of charging modules, and meanwhile, the current master control module receives a control signal output by the MCU controller and starts or closes to provide current for the charging modules based on the control signal;
the charging module includes:
the charging unit comprises a charging chip and a battery interface, wherein the charging chip comprises a charging enable end, a current output end and a grounding end, the battery interface is formed by connecting the current output end and the grounding end in series, and the charging interface, the current output end and the grounding end form a charging branch; and the charging enabling end controls the on-off of the charging branch circuit based on the control signal output by the MCU.
By adopting the technical scheme, whether the charging branch circuits are charged or not in all the charging modules or whether some charging branch circuits are charged or not can be controlled under the action of the MCU controller, so that the polling charging control of the charging circuit can be realized. In addition, the charging chip enables the charging branch circuit to provide stable charging current for the battery in the battery interface, and the stability of the current in the whole charging process is guaranteed.
The invention is further configured to: the charging module further includes:
the current sampling unit is connected to the charging branch and used for acquiring a current value signal on the charging branch and outputting the current value signal to the MCU controller;
and the battery detection unit is coupled to the charging branch and used for detecting whether the battery exists on the charging branch and outputting a corresponding battery detection signal to the MCU controller based on whether the battery exists on the charging branch.
By adopting the technical scheme, the current value signal sampled by the current sampling unit can help the MCU controller to determine the number of the polled charging branches, and the battery detection signal output by the battery detection unit can help the MCU controller to determine the number of the batteries to be charged, so that under the combined action of the current sampling unit and the battery detection unit, the MCU controller can obtain more comprehensive detection information of the charging branches.
The invention is further configured to: the battery detection unit comprises a voltage supply branch and a detection branch, wherein the voltage supply branch is connected between the current output end of the charging chip and the battery interface node and is used for providing reference voltage; the detection branch circuit is connected in parallel at two ends of the battery interface and comprises a first detection resistor and a second detection resistor, one end of the first detection resistor is connected to the voltage output end of the power supply branch circuit, the other end of the first detection resistor is connected to one end of the second detection resistor, the other end of the second detection resistor is connected to a node between the current grounding end of the charging chip and the battery interface, and a battery detection signal is sent out by the node between the first detection resistor and the second detection resistor.
By adopting the technical scheme, when no battery exists in the battery interface, the voltage of the output end of the voltage supply branch circuit is close to the power supply voltage of 5V, and the voltage value of a battery detection signal output by a node between the first detection resistor and the second detection resistor in the detection branch circuit is in a stable voltage value range. When a battery exists in the battery interface, the voltage value of the output end of the voltage supply branch circuit is equal to the battery voltage inserted into the battery interface, so that the voltage input to the detection branch circuit is reduced, the voltage value of a battery detection signal output by a node between the first detection resistor and the second detection resistor is reduced, and the voltage value input to the MCU controller is reduced. Therefore, the MCU controller can judge whether the battery exists in the battery interface or not based on whether the acquired voltage value of the battery detection signal is within the threshold value or not.
The invention is further configured to: the charging device also comprises an indicating module which is in one-to-one correspondence with the charging module.
By adopting the technical scheme, the indicating module outputs interactive indicating information to help to know whether the battery is in a charging state or not.
Compared with the prior art, the invention has the beneficial effects that:
(1) the charged batteries are all under the rated current through calculation, and the charging time lengths of all the batteries in one period are ensured to be equal through a polling mode, so that the equalizing charging of the batteries is realized;
(2) the polling charging time is controllable, and the adaptive situation is more.
Drawings
FIG. 1 is a schematic circuit diagram of the present embodiment;
fig. 2 is a schematic flow chart of the method of the present embodiment.
Reference numerals: 1. a power supply module; 2. an MCU controller; 3. a current master control module; 4. a charging module; 5. an indication module; 6. a USB connector; 7. a total voltage detection branch; 8. switching a branch circuit; 9. a charging unit; 10. a current sampling unit; 11. a battery detection unit; 12. a switch transfer member; 13. an indicating unit; 14. a charging chip; 15. a battery interface; 16. a voltage branch circuit; 17. and detecting the branch circuit.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
In an embodiment, a battery equalizing charge system is shown in fig. 1, and includes a power supply module 1, an MCU controller 2, a current master control module 3, a charge module 4, and an indication module 5, where the number of the charge module 4 and the indication module 5 is the same and is multiple, and the number of the specific charge module 4 and the indication module 5 is increased or decreased according to actual needs, and in this embodiment, four charge modules 4 and indication modules 5 are taken as an example.
And the module is connected, and the input end of the power supply module 1 is connected with an external USB interface to obtain a power supply output by the USB interface. The output of power module 1 is connected to the input of the total control module of electric current 3, receives the electric current of following the output of power module 1, and the output of the total control module of electric current 3 is connected respectively and is charged module 4, and the total control module of electric current 3 receives the control signal of MCU controller 2 output simultaneously, when 1 output voltage of power module is not in reasonable threshold, cuts off the output, stops providing the electric current for charging module 4.
The MCU controller 2 is a single chip microcomputer controller, and in this embodiment, the model of MC96F6332L is adopted.
The power supply module 1 comprises a USB connector 6 and a total voltage detection branch circuit 7, wherein the USB connector 6 is used for connecting an external USB interface and obtaining voltage and current. The USB connector 6 generally includes five pins, wherein pin 1 is a power input pin, and pin 5 is a ground pin. The total voltage detection circuit is connected between pins 1 and 5 of the USB connector 6, is used for detecting the voltage value accessed by the USB connector 6 and outputs the voltage value to the MCU controller 2. Specifically, the total voltage detection branch circuit 7 includes a first voltage-dividing resistor, a second voltage-dividing resistor and a first protection capacitor, one end of the first voltage-dividing resistor is connected to pin 1 of the USB connector 6, the other end of the first voltage-dividing resistor is connected to one end of the second voltage-dividing resistor, and the other end of the second voltage-dividing resistor is connected to pin 5 of the USB connector 6, and the protection capacitor is connected in parallel to two ends of the second resistor. The detection signal of the total voltage detection branch circuit 7 is sent to the MCU controller 2 from the node of the first voltage-dividing resistor and the second voltage-dividing resistor, and the MCU controller 2 operates according to the voltage value corresponding to the detection signal after receiving the detection signal, where the normal voltage input value of the USB connector 6 is generally 4.5V to 5.5V, and if the voltage input value exceeds this range, the USB connector 6 is in an abnormal power supply state. Under abnormal power supply, the MCU controller 2 will cut off power supply to all the charging modules 4 through the current bus module 3.
The current master control module 3 comprises a plurality of switching elements and a switching branch 8 for connecting the enabling end of the switching element and the MCU controller 2. In this embodiment, it is preferable to use an AO4453 switch chip having four MOS transistors, and the AO4453 chip includes eight pins, three source input pins, four drain output pins, and one gate control pin. Wherein, the three source input pins are connected in parallel and then connected with a 1-pin input power supply of the USB connector 6. The four drain output pins are connected in parallel and then are respectively connected with the power input ends of the four charging modules 4. The grid control pin is connected with the output end of the switching branch 8.
The switching branch circuit 8 comprises a first switching triode, a second switching triode, a first switching resistor, a second switching resistor, a third switching resistor and a fourth switching resistor; the first switch triode and the second switch triode are P-type triodes. Wherein, the pin of MCU controller 2 is connected to the one end of first adapter resistor, receives the output signal of MCU controller 2, and the other end of first adapter resistor is connected in the base of first switch triode, and the both ends of second adapter resistor are connected respectively between 1 foot of USB joint 6 and the base of first switch triode, and the both ends of third adapter resistor are connected respectively between 1 foot of USB joint 6 and the collecting electrode of first switch triode, and the projecting pole of first switch triode ground connection. Two ends of the fourth transfer resistor are respectively connected between the pin 1 of the USB connector 6 and the collector of the second switching triode, and the emitter of the second switching triode is grounded. And the grid control pin is connected with a node between the fourth transfer resistor and the collector of the second switching triode. When the MCU controller 2 outputs a control signal of high level, the base electrode of the first switching triode inputs high level, the first switching triode is conducted, the base electrode of the second switching triode inputs low level, the second switching triode is cut off, and the grid control pin inputs high level. When the MCU controller 2 outputs a control signal of low level, the base electrode of the first switching triode inputs low level, the first switching triode is cut off, the base electrode of the second switching triode inputs high level, the second switching triode is conducted, and the grid control pin inputs low level. Therefore, the switching circuit converts the control signal output by the MCU controller 2 into a control signal which is suitable for the voltage and can control the AO4453 switch chip to be switched on and switched off.
The number of the charging modules 4 is four, and the structures of the charging modules 4 in each group are the same. The charging module 4 includes a charging unit 9, a current sampling unit 10, and a battery detection unit 11.
The charging unit 9 comprises a charging chip 14 and a battery interface 15, the charging chip 14 comprises a charging enable terminal, a current input terminal, a current output terminal and a grounding terminal, and the battery interface 15 is connected in series between the current output terminal and the grounding terminal, so that the charging interface, the current output terminal and the grounding terminal form a charging branch; the current input end is connected with the external current output, the charging enable end receives a control signal sent by the MCU controller 2, and when the MCU controller 2 sends a starting control signal to the charging enable end, the current input into the charging chip 14 by the current input end is processed by the charging chip 14 and then is connected into the charging branch, so that the battery in the charging unit 9 is in a charging state. When the MCU controller 2 sends a cut-off control signal to the charging enable terminal, the current input from the current input terminal into the charging chip 14 will not be connected to the charging branch, so that the battery in the charging unit 9 is in an uncharged state.
Specifically, a switch transmission part 12 is arranged between the charging enable end of the charging chip 14 and the MCU controller 2, the switch transmission part 12 includes an input resistor, a third switching triode and a third voltage dividing resistor, and the third switching triode is P-type. One end of the third voltage division resistor is connected to the charging enabling end, the other end of the third voltage division resistor is connected to the collector electrode of the third switching triode, the emitting electrode of the third switching triode is grounded, one end of the input resistor is connected to one end pin of the MCU controller 2, and the other end of the input resistor is connected to the base electrode of the third switching triode. Therefore, under the action of the third switch transmission part 12, when the MCU controller 2 outputs a high-level control signal, the third switch triode is turned on, and the charging enable terminal is grounded through the voltage-dividing resistor, so that the charging enable terminal obtains a low-level input signal. When the MCU controller 2 outputs a low-level control signal, the third switching transistor is turned off, and the charging enable terminal is in a turned-off state, so that the charging enable terminal does not acquire an input signal.
The current sampling unit 10 is connected to the charging branch, and is configured to obtain a current value signal on the charging branch and output a voltage signal of current sampling. The specific current sampling unit 10 comprises a first resistor, a sampling resistor and a decoupling capacitor, the first resistor is connected in series between the grounding ends of the battery interface 15 and the charging chip 14, one end of the sampling resistor is connected to a node between the first resistor and the battery interface 15, the other end of the sampling resistor is connected with the MCU controller 2, and two ends of the decoupling capacitor are respectively connected between the grounding ends of the first resistor and the charging chip 14. The sampled current flows from the node between the first resistor and the battery interface 15 to the sampling resistor, and is converted into a voltage at the sampling resistor and then input to the MCU controller 2. Specifically, the first resistor is 0.1K ohm in resistance, the sampling resistor is 1K ohm in resistance, and the influence of the resistors on the current on the charging branch circuit is reduced.
A battery detection unit 11, coupled to the charging branch, for detecting whether a battery exists in the charging branch, and outputting a corresponding battery detection signal to the MCU controller 2 based on whether a battery exists in the charging branch; specifically, the battery detection unit 11 includes a voltage supply branch 16 and a detection branch 17, and the voltage supply branch 16 is connected between the current output terminal of the charging chip 14 and the node of the battery interface 15, and is used for providing a reference voltage. Specifically, the voltage supply branch 16 includes a short-prevention diode and a voltage drop resistor, an anode of the short-prevention diode is connected to a 5V power supply voltage, a cathode of the short-prevention diode is connected to one end of the voltage drop resistor, and the other end of the voltage drop resistor is connected to a node between a current output end of the charging chip 14 and the battery interface 15. The detection branch 17 is connected in parallel to two ends of the battery interface 15, and includes a first detection resistor, a second detection resistor and a protection capacitor, one end of the first detection resistor is connected to the voltage output end of the power supply branch, the other end of the first detection resistor is connected to one end of the second detection resistor, the other end of the second detection resistor is connected to a node between the current grounding end of the charging chip 14 and the battery interface 15, and the protection capacitor is connected in parallel to two ends of the second resistor. The resistance values of the first detection resistor and the second detection resistor are at least 100K ohms, excessive shunting of the charging branch is avoided, the resistance value of the first detection resistor is 200K ohms in the embodiment, and the resistance value of the second detection resistor is 100K ohms. The battery detection signal is emitted from a node between the first detection resistor and the second detection resistor.
When no battery exists in the battery interface 15, the voltage at the output end of the voltage supply branch 16 is close to the supply voltage of 5V, and the voltage value of the battery detection signal output from the node between the first detection resistor and the second detection resistor in the detection branch 17 is within a stable voltage value range. When a battery exists in the battery interface 15, the voltage value of the output end of the voltage supply branch 16 is equal to the battery voltage inserted into the battery interface 15, so that the voltage input to the detection branch 17 decreases, which causes the voltage value of the battery detection signal output from the node between the first detection resistor and the second detection resistor to decrease, and the voltage value input to the MCU controller 2 decreases. Therefore, the MCU controller 2 can determine whether or not a battery is present in the battery interface 15 based on whether or not the acquired voltage value of the battery detection signal is within the threshold value.
The indicating module 5 comprises a plurality of indicating units 13, the number of the indicating units 13 is the same as that of the charging modules 4, and the indicating units 13 of the charging modules 4 correspond to one another. The indicating unit 13 includes a charging indicating lamp and an uncharged indicating lamp, the charging indicating lamp and the uncharged indicating lamp are of two colors, such as a green light and a red light; the anode of the charging indicator lamp is connected with the MCU controller 2, and the cathode is grounded; similarly, the anode of the uncharged indicator lamp is connected with the MCU controller 2, and the cathode is grounded. The MCU controller 2 acquires an output signal of the indicating unit 13 corresponding to the current sampling unit 10 of the charging module 4, and when the output current value signal of the current sampling unit 10 is not 0, the MCU controller 2 outputs a level signal to control a charging indicator lamp to be turned on, and an uncharged indicator lamp is turned off; otherwise, the MCU controller 2 outputs a level signal to control the charging indicator lamp to be turned off, and the non-charging indicator lamp is turned on.
As shown in fig. 2, a battery equalizing charge method:
s1, obtaining input power supply voltage, judging whether the input voltage is in a safe voltage value, if not, cutting off the current of the input charging branch, and if so, executing a step S2;
the MCU controller 2 obtains a voltage value signal output by the total voltage detection branch 7 of the power supply module 1, and compares the voltage value signal with a preset safe voltage value range, wherein the safe voltage value range is generally set to be 4.5V to 5.5V.
And the MCU controller 2 is used for executing and outputting a control signal to the current master control element to control when the current input into the charging branch is cut off.
S2, sequentially detecting whether a battery exists in the battery interface 15, and recording a charging branch with the battery interface 15 as a working branch;
in the embodiment, the MCU controller 2 obtains the detection voltage values output by the four battery detection units 11, respectively, if the output detection voltage value is smaller than a preset detection threshold, a battery exists in the battery interface 15 corresponding to the charging branch, otherwise, no battery exists in the battery interface 15.
S3, starting the working branches, sequentially obtaining charging current values of the working branches, and adding the charging current values to obtain a charging current sum value;
the charging branch is opened and closed, and a control signal is output to the switch transmission piece 12 of the charging unit 9 through the MCU controller 2 to control the on-off of the charging branch.
The MCU controller 2 acquires a voltage value signal of current sampling input from the current sampling unit 10, and then converts the acquired voltage value signal into a corresponding current value. And finally, adding the obtained current values in the charging branches to obtain a sum value of the charging current.
S4, comparing the obtained charging current sum value with the multiple of the rated current value of a single battery one by one, and obtaining the maximum multiple value smaller than the charging current sum value as the polling charging quantity;
the rated current value of the battery refers to the maximum rated value when the battery is charged, the rated current values of different batteries are different, and in the scheme, the rated current value is 0.5A.
For example, there are three batteries in the battery interface 15, and the sum of the charging currents corresponding to the three battery interfaces 15 is 1.4A. The MCU controller 2 first compares the doubled battery rated current value, 0.5A of which is less than 1.4A, with the sum of the charging current. Then, the MCU controller 2 compares the twice rated battery current value with the total charging current value, wherein the twice rated battery current value 1A is less than 1.4A. Then the MCU controller 2 compares the battery rated current value which is three times with the charging current sum value, wherein the three times of the battery rated current value 1.5A is larger than 1.4A. Therefore, the MCU controls the charging current control circuit to obtain a maximum multiple value of 2 which is smaller than the sum value of the charging currents, and the polling charging quantity is 2.
S5, performing polling charging on the working branch;
only the batteries of polling charging quantity are charged, even if each charging branch in polling charging is under the battery rated current value, the charging branch is smaller than the charging current sum value accessed by the USB interface, so that the charging current of the charging circuit in polling charging can be ensured to be under the stable battery rated current value.
Wherein the polling charging includes: and starting the work branches with the polling charging quantity, and replacing the started charging branches after a preset polling time length so that the charging time lengths of the charging branches with the batteries in the battery interface 15 are equal after a plurality of polling time lengths. The polling durations are positive integer numbers of polling durations of one or more. The polling duration is typically set to 1 to 2 seconds.
The mode of replacing the opened charging branch circuit mainly comprises the following two modes:
the first method comprises the following steps:
sequencing the working branches one by one to form working serial numbers;
acquiring the working sequence number of the last opened working branch;
sequentially and equidirectionally moving the last working serial number by the serial number equal to the polling charging number to obtain the working serial number to be started;
and starting the working branch corresponding to the working serial number to be started.
Suppose we currently have a number of active legs of 5 and a polling charge number of 3. In the first way, we will label the five working branches as the first working branch, the second working branch, the third working branch, the fourth working branch and the fifth working branch, respectively. The number of serial numbers per move is 3.
The first polling duration will open the first working branch, the second working branch, and the third working branch, and the second polling duration will open the fourth working branch, the fifth working branch, and the first working branch. The third polling duration is that the second working branch, the third working branch and the fourth working branch are started, and so on, so that after 5 polling durations, all the working branches are charged for 3 polling durations. Uniform charging of all the cells is achieved.
And the second method comprises the following steps:
sequencing the working branches one by one to form working serial numbers;
acquiring the working sequence number of the last opened working branch;
moving the last working sequence number in sequence in the same direction and obtaining the working sequence number to be started;
and starting the working branch corresponding to the working serial number to be started.
Suppose we currently have a number of active legs of 5 and a polling charge number of 3. In the first way, we will label the five working branches as the first working branch, the second working branch, the third working branch, the fourth working branch and the fifth working branch, respectively. The number of serial numbers per move is 1.
The first polling duration will open the first working branch, the second working branch, and the third working branch, and the second polling duration will open the second working branch, the third working branch, and the fourth working branch. The third polling duration is that the third working branch, the fourth working branch and the fifth working branch are opened, and so on, so that after 5 polling durations, all the working branches are charged for 3 polling durations. Uniform charging of all the cells is achieved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A battery equalizing charge method is characterized in that: the method comprises the following steps:
whether a battery exists in the battery interface (15) is detected in sequence, and a charging branch with the battery interface (15) is recorded as a working branch;
starting a charging switch of the working branch, leading the charging current to the working branch, sequentially obtaining the charging current values of the working branch, and adding to obtain the total charging current value;
comparing the obtained charging current sum value with the multiple of the rated current value of a single battery one by one to obtain the maximum multiple value smaller than the charging current sum value as the polling charging quantity;
performing polling charging on the working branch;
wherein the polling charging includes:
and starting the work branches with the polling charging quantity, and replacing the started work branches after a preset polling time length so that the charging time lengths of all the work branches after a plurality of polling time lengths are equal.
2. The battery equalizing charge method of claim 1, wherein:
replacing the opened working branch comprises:
closing the working branch in the opening state;
starting working branches of polling charging quantity;
wherein, the work branch road of opening polling charge quantity includes:
sequencing the working branches one by one to form working serial numbers;
acquiring the working sequence number of the last opened working branch;
moving the last working sequence number in sequence in the same direction by one sequence number to obtain a working sequence number to be started;
and starting the working branch corresponding to the working serial number to be started.
3. The battery equalizing charge system of claim 2, wherein: replacing the opened working branch comprises:
closing the working branch in the opening state;
starting working branches of polling charging quantity;
wherein, the work branch road of opening polling charge quantity includes:
sequencing the working branches one by one to form working serial numbers;
acquiring the working sequence number of the last opened working branch;
sequentially and equidirectionally moving the last working serial number by the serial number equal to the polling charging number to obtain the working serial number to be started;
and starting the working branch corresponding to the working serial number to be started.
4. The battery equalizing charge method of claim 1, wherein: the polling duration is set to 1 to 2 seconds.
5. The battery equalizing charge method of claim 1, wherein: the presence of a battery in the battery interface (15) is detected based on detecting a node voltage value on the charging branch.
6. The battery equalizing charge method of claim 1, wherein: further comprising: the method comprises the steps of obtaining input power supply voltage, judging whether the input voltage is within a preset safe voltage value, if not, cutting off the current of an input charging branch, and if so, sequentially detecting whether a battery exists in a battery interface (15).
7. The battery equalizing charge system applied to the method of any one of claims 1 to 6, wherein: the device comprises a power supply module (1), an MCU (microprogrammed control unit) controller (2), a current master control module (3) and a plurality of charging modules (4), wherein the number of the charging modules (4) is multiple;
the input end of the power supply module (1) is connected with an external USB interface to obtain a power supply output by the USB interface, and the output end of the power supply module (1) is connected to the input end of the current master control module (3), so that the current master control module (3) receives the current output from the power supply module (1);
the output end of the current master control module (3) is respectively connected with the plurality of charging modules (4), and meanwhile, the current master control module (3) receives a control signal output by the MCU controller (2) and turns on or off to supply current for the charging modules (4) based on the control signal;
the charging module (4) further comprises:
the charging unit (9) comprises a charging chip (14) and a battery interface (15), wherein the charging chip (14) comprises a charging enabling end, a current output end and a grounding end, the battery interface (15) is connected in series between the current output end and the grounding end to form a charging branch circuit, and the charging interface, the current output end and the grounding end form a charging branch circuit; and the charging enabling end controls the on-off of the charging branch circuit based on the control signal output by the MCU.
8. The battery equalizing charge system of claim 7, wherein: the charging module (4) further comprises:
the current sampling unit (10) is connected to the charging branch and used for acquiring a current value signal on the charging branch and outputting the current value signal to the MCU controller (2);
and the battery detection unit (11) is coupled to the charging branch and used for detecting whether the battery exists on the charging branch and outputting a corresponding battery detection signal to the MCU controller (2) based on whether the battery exists on the charging branch.
9. The battery equalizing charge system of claim 8, wherein: the battery detection unit (11) comprises a voltage supply branch (16) and a detection branch (17), wherein the voltage supply branch is connected between the current output end of the charging chip (14) and the node of the battery interface (15) and is used for providing reference voltage; the detection branch circuit (17) is connected in parallel with two ends of the battery interface (15) and comprises a first detection resistor and a second detection resistor, one end of the first detection resistor is connected with the voltage output end of the power supply branch circuit, the other end of the first detection resistor is connected with one end of the second detection resistor, the other end of the second detection resistor is connected with a node between the current grounding end of the charging chip (14) and the battery interface (15), and a battery detection signal is sent out by the node between the first detection resistor and the second detection resistor.
10. The battery equalizing charge system of claim 1, wherein: the charging device also comprises indicating modules (5) which correspond to the charging modules (4) one to one.
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