CN112271777A - Series battery monomer constant voltage circuit and control method thereof - Google Patents
Series battery monomer constant voltage circuit and control method thereof Download PDFInfo
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- CN112271777A CN112271777A CN202011166447.8A CN202011166447A CN112271777A CN 112271777 A CN112271777 A CN 112271777A CN 202011166447 A CN202011166447 A CN 202011166447A CN 112271777 A CN112271777 A CN 112271777A
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- 238000000034 method Methods 0.000 title claims abstract description 42
- 239000000178 monomer Substances 0.000 title claims abstract description 12
- 230000005669 field effect Effects 0.000 claims description 101
- 239000003990 capacitor Substances 0.000 claims description 33
- 238000005070 sampling Methods 0.000 claims description 7
- 230000008859 change Effects 0.000 claims description 6
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 11
- 238000007599 discharging Methods 0.000 abstract description 7
- 238000010280 constant potential charging Methods 0.000 abstract description 5
- 238000010277 constant-current charging Methods 0.000 abstract description 4
- 238000007600 charging Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004064 recycling Methods 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
-
- 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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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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
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a series battery monomer constant voltage circuit, which comprises batteries and a direct current power supply, wherein two ends of each battery are connected in parallel with a battery constant voltage unit, all the battery constant voltage units are connected to a control unit for controlling the state of the constant voltage unit, the feedback positive terminal of each battery constant voltage unit is connected with the positive terminal of the input of the direct current power supply, the feedback negative terminal of each constant voltage unit is connected with the negative terminal of the input of the direct current power supply, and the mode that the control unit controls the state of the constant voltage unit is that the integral constant current charging and discharging process step of the batteries can be realized, and the constant voltage charging process step of a single battery is also realized; in addition, when a single battery is used for constant voltage, redundant energy is fed back to the direct current power supply process. The invention also discloses a control method of the series battery monomer constant voltage circuit. The invention can realize the whole constant-current charging and discharging process step of the battery and the process step of constant-voltage charging of a single battery under the state that the batteries are connected in series.
Description
Technical Field
The invention relates to the technical field of battery charging and discharging control circuits, in particular to a series battery monomer constant voltage circuit and a control method thereof.
Background
In the formation/capacity grading process of the lithium battery, the battery needs to be charged/discharged at a constant current, and when the battery is charged/discharged at a constant current to a certain voltage, the battery needs to be charged/discharged at a constant voltage.
At present, in a conventional scheme, one channel is used for carrying out constant-current constant-voltage charging/discharging on one battery, but the problem of battery consistency is easily caused due to differences of different channels. It was subsequently proposed to connect the cells in series, using the same channel for charging/discharging them.
After the batteries are connected in series, when the batteries are subjected to the charging/discharging process, the currents flowing through each battery should be equal, but due to the difference of the batteries, some batteries will enter the constant voltage process first, other batteries are still in the constant current process, the current flowing through the batteries after entering the constant voltage process is reduced, and the current flowing through the batteries in the constant current process is kept unchanged, which creates a contradiction. The present invention is designed to solve this contradiction.
Disclosure of Invention
The invention aims to provide a series battery monomer constant voltage circuit and a control method thereof, wherein the series battery monomer constant voltage circuit comprises the following steps: the constant-current charging and discharging process of the main circuit of the series-connected batteries can be realized in the state that the batteries are connected in series, the constant-voltage charging process of a single battery can be realized, meanwhile, when the constant-voltage charging process of the single battery is carried out, redundant energy is fed back to the input end of the DC/DC, the energy is recycled, the energy is prevented from being consumed without reasons, and in addition, the cost of the variable-capacity power supply can be reduced.
In order to achieve the purpose, the invention provides the following technical scheme: a series battery monomer constant voltage circuit, includes more than one battery of establishing ties each other and at series battery both ends and for the DC/DC power supply of series battery power supply, its characterized in that: the two ends of each battery are connected in parallel with a battery constant voltage unit for controlling the constant voltage state of the battery, all the battery constant voltage units are connected to a control unit for controlling the state of the battery constant voltage unit, the feedback positive pole end of each battery constant voltage unit is connected with the positive pole of the input end of the DC/DC direct current power supply, the feedback negative pole end of each battery constant voltage unit is connected with the negative pole of the input end of the DC/DC direct current power supply, and the mode of the control unit for controlling the state of the constant voltage power supply can realize the integral constant current process step of the battery and can also realize the constant voltage process step of a single battery; in addition, when a single battery is in a constant voltage process step, redundant energy is fed back to the input end of the DC/DC power supply.
Preferably, the specific steps of the control unit for realizing the overall constant-current process step are as follows: when one battery constant voltage unit does not work, the current flowing through each battery is consistent with the output current of the DC/DC power supply; when a certain battery enters a constant voltage state, the battery constant voltage unit reduces the current flowing through the battery in order to keep the battery constant voltage state, the reduced current flows to the next battery through the battery constant voltage unit, so that the current of other batteries and the current on a battery series circuit in a constant current stage are kept unchanged, and meanwhile, the battery constant voltage unit can feed redundant energy on the constant voltage battery back to the input end of the DC/DC direct current power supply for recycling.
Preferably, each battery constant voltage unit comprises a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a first inductor L1, the pin D of the third field effect transistor Q3 is connected with the cathode of a second diode D2, the anode of the second diode D2 is connected with the pin D of the second field effect transistor Q2 through a first diode D1, the pin S of the second field effect transistor Q2 is connected with the cathode of a DC/DC direct current power supply through a series-connected fourth diode D4 and third diode D3, the pin D of the second field effect transistor Q2 is also connected with the pin S of the first field effect transistor Q1 through a first inductor L1, the pin D of the first field effect transistor Q1 is connected with the anode of a corresponding battery, and the cathode of the same battery is connected with the pin S2 of the same battery unit, the control unit includes the master controller, D/A converter and AD converter be connected with the master controller, the master controller passes through D/A converter connection director, the output connection PWM generator of controller, the output of PWM generator passes through the G foot that driver chip connects second field effect transistor Q2 and third field effect transistor Q3, the G foot of first field effect transistor Q1 is directly connected to the output of master controller, realizes directly controlling first field effect transistor Q1, is connected with the voltage sampling unit between AD converter and controller, the voltage sampling unit is collected the voltage of battery through connecting the battery and is transported to the A/D converter.
Preferably, a first capacitor C1 is connected between a common terminal of the first diode D1 and the second diode D2 and the fourth diode D4 and the third diode D3, and a second capacitor C2 is connected between the S-leg of the first fet Q1 and the S-leg of the second fet Q2.
The invention also discloses a control method of the series battery monomer constant voltage circuit, which is characterized in that:
s1, when the battery is in a constant current stage, the first field effect transistor Q1 is conducted, the second field effect transistor Q2 and the third field effect transistor Q3 are closed, the current output by the DC/DC direct current power supply flows through the battery after flowing through the first field effect transistor Q1, and the current of the battery connected in series at the moment is equal to the current output by the DC/DC direct current power supply; when the series-connected batteries enter a constant voltage state, the two switching tubes of the second field-effect tube Q2 and the third field-effect tube Q3 enter a high-frequency switching state, and the first field-effect tube Q1 keeps a conducting state; the following three states are then completed:
the first state: the first field effect transistor Q1, the second field effect transistor Q2 and the third field effect transistor Q3 are conducted, the DC/DC direct current power supply output is divided into two parts, one part enters the anode of the battery from the first field effect transistor Q1 and then flows to the next battery through the cathode of the battery, the other part flows through the first inductor L1, the second field effect transistor Q2 flows to the next battery through the path, at the moment, because the third diode D3 and the fourth diode D4 are conducted IN a single direction, the part of current and the cathode current of the battery can not directly flow to the cathode IN of the DC/DC direct current power supply input end, the inductor can accumulate a part of energy at the moment, because the voltage of the DC/DC power supply input is higher than the voltage of the series batteries, at the moment, the current can not flow to the anode IN of the DC/DC direct current power supply input end through the path of the first inductor L1, the first diode D1, the second diode D2 and the third field effect transistor Q3, at this time, it can be ensured that the current of the following battery is not changed, and because of the unidirectional conduction of the second diode D2, the positive electrode IN + of the DC/DC power input terminal cannot charge the first capacitor C1;
the second state: the first field effect transistor Q1 is turned on, the second field effect transistor Q2 and the third field effect transistor Q3 are turned off, and the current output by the DC/DC direct-current power supply can be divided into two parts because the current on the inductor can not change suddenly: one part is current on the inductor, because of the unidirectional conduction of the third diode D3, the current will flow to the next battery through the loop of the first inductor L1, the first diode D1, the first capacitor C1 and the fourth diode D4 in sequence, and at the same time charge the first capacitor C1, while the other part will flow to the next battery through the loop of the first field-effect tube Q1 flowing through the positive pole and the negative pole of the battery, thus ensuring that the current of the next battery is not changed;
the third state: the first field effect transistor Q1, the second field effect transistor Q2 and the third field effect transistor Q3 are conducted, and the output of the DC/DC power supply is divided into two parts: one part flows from the first field effect transistor Q1 to the positive pole of the battery, and the negative pole of the battery flows to the next battery; the other part of the current flows to the next battery through the path of the second fet Q2 through the first inductor L1, at this time, because the third diode D3 and the fourth diode D4 are unidirectionally conducted, the part of the current and the battery cathode current cannot directly flow to the cathode IN of the DC/DC power input terminal, and the inductor accumulates a part of energy at this time, because the voltage of the DC/DC power input is higher than the voltage of the series-connected batteries, at this time, the current cannot flow to the anode IN + of the DC/DC power input terminal through the path of the first inductor L1, the first diode D1, the second diode D2, and the third fet Q3, at this time, it can be ensured that the current of the following battery does not change, and because the first inductor L1 charges the first capacitor IN the second state, at this time, a certain voltage exists across the first capacitor, if the voltage across the first capacitor at this time is greater than the voltage across the anode IN + of the DC/DC power input terminal, the first capacitor flows through the loop of the anode of the first capacitor, the second diode D2, the third field effect transistor Q3, the anode IN + of the DC/DC power supply input end, the cathode IN-of the DC/DC power supply input end, the third diode D3 and the cathode of the first capacitor to feed back energy;
and S2, continuously repeating the second state and the third state, so that the constant voltage of a single battery can be realized in the serial connection state of the batteries, the current flowing through other batteries and the output of the DC/DC direct-current power supply is not influenced, and redundant energy in the constant voltage of the batteries can be fed back to the input end of the DC/DC direct-current power supply.
The series battery monomer constant voltage circuit and the control method thereof have the following advantages that:
1. the battery constant-current control method can realize the integral constant-current process step of the batteries connected in series under the state that the batteries are connected in series, and can realize the constant-voltage process step of a single battery.
2. In the single-battery constant-voltage process step, redundant energy is fed back to the input end of the DC/DC, and the energy is recycled, so that the energy is prevented from being consumed without any reason.
3. The cost of the variable capacity power supply is reduced.
Drawings
Fig. 1 is an overall schematic diagram of a series cell constant voltage circuit in the present embodiment 1;
fig. 2 is a schematic diagram of a control unit in a constant voltage circuit of a series battery cell in the present embodiment 1;
fig. 3 is a circuit connection diagram of a battery constant voltage unit in the present embodiment 1.
In the figure: the device comprises a battery 1, a DC/DC (direct current/direct current) power supply 2, a battery constant voltage unit 3, a control unit 4, a master controller 4-1, a D/A (digital/analog) converter 4-2, a controller 4-3, a PWM (pulse-width modulation) generator 4-4, a driving chip 4-5, a voltage sampling unit 4-6 and an A/D converter 4-7.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
referring to fig. 1-3, the present embodiment provides a series battery cell constant voltage circuit, which includes more than one battery 1 connected in series and a DC/DC power supply 2 connected to two ends of the series battery 1 and supplying power to the series battery 1, and is characterized in that: the two ends of each battery 1 are connected in parallel with a battery constant voltage unit 3 for controlling the constant voltage state of the battery 1, all the battery constant voltage units 3 are connected to a control unit 4 for controlling the state of the battery constant voltage unit 3, the feedback positive end of each battery constant voltage unit 3 is connected with the positive electrode of the input end of the DC/DC direct-current power supply 2, the feedback negative end of each battery constant voltage unit 3 is connected with the negative electrode of the input end of the DC/DC direct-current power supply 2, and the mode of the control unit 4 for controlling the state of the constant voltage power supply can realize the integral constant current process step of the battery 1 and can also realize the constant voltage process step of a single battery 1; and in addition, in the process of constant voltage of the single battery 1, redundant energy is fed back to the input end of the DC/DC power supply 2.
Preferably, the specific steps of the control unit 4 for realizing the overall constant current process step are as follows: when one battery constant voltage unit 3 does not work, the current flowing through each battery 1 is consistent with the output current of the DC/DC direct current power supply 2; when a certain battery 1 enters a constant voltage state, the battery constant voltage unit 3 reduces the current flowing through the battery 1 in order to keep the constant voltage state of the battery 1, the reduced current flows to the next battery 1 through the battery constant voltage unit 3, so that the current of the other battery 1 and the current on the series loop of the battery 1 are kept unchanged in the constant current stage, and meanwhile, the battery constant voltage unit 3 can feed the redundant energy on the constant voltage battery 1 back to the input end of the DC/DC direct current power supply 2 for recycling.
Preferably, each battery constant voltage unit 3 includes a first fet Q1, a second fet Q2, a third fet Q3, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a first inductor L1, a pin D of the third fet Q3 is connected to a negative electrode of the second diode D2, a positive electrode of the second diode D2 is connected to a pin D of the second fet Q2 through the first diode D1, a pin S of the second fet Q2 is connected to a negative electrode of the DC/DC power supply 2 through the series-connected fourth diode D4 and third diode D3, a pin D of the second fet Q2 is further connected to a pin S of the first fet Q1 through the first inductor L1, a pin D of the first fet Q1 is connected to a positive electrode of a corresponding one battery 1, and a negative electrode of the same battery unit 1 is connected to a pin S2 of the same battery unit Q3, the control unit 4 comprises a master controller 4-1, a D/A converter 4-2 and an A/D converter 4-7, the master controller 4-1 is connected with a controller 4-3 through the D/A converter 4-2, the output of the controller 4-3 is connected with a PWM generator 4-4, the output of the PWM generator 4-4 is connected with G pins of a second field effect tube Q2 and a third field effect tube Q3 through a driving chip 4-5, the output of the master controller 4-1 is directly connected with the G pin of a first field effect tube Q1 to realize direct control of the first field effect tube Q1, a voltage sampling unit 4-6 is connected between the A/D converter 4-7 and the controller 4-3, and the voltage sampling unit 4-6 collects and transmits the voltage of the battery 1 to the A/D converter through connecting the battery 1 4-7.
Preferably, a first capacitor C1 is connected between a common terminal of the first diode D1 and the second diode D2 and the fourth diode D4 and the third diode D3, and a second capacitor C2 is connected between the S-leg of the first fet Q1 and the S-leg of the second fet Q2.
The invention also discloses a control method of the series battery monomer constant voltage circuit, which is characterized in that:
s1, when the battery 1 is in a constant current stage, the first field effect transistor Q1 is conducted, the second field effect transistor Q2 and the third field effect transistor Q3 are closed, the current output by the DC/DC direct current power supply 2 flows through the battery 1 after flowing through the first field effect transistor Q1, and the current of the battery 1 connected in series at the moment is equal to the current output by the DC/DC direct current power supply 2; when the battery 1 connected in series enters a constant voltage state, the two switching tubes of the second field effect tube Q2 and the third field effect tube Q3 enter a high-frequency switching state, and the first field effect tube Q1 keeps a conducting state; the following three states are then completed:
the first state: the first field effect transistor Q1, the second field effect transistor Q2 and the third field effect transistor Q3 are conducted, the output of the DC/DC power supply 2 is divided into two parts, one part enters the anode of the battery 1 from the first field effect transistor Q1 and then flows to the next battery 1 through the cathode of the battery 1, the other part flows through the first inductor L1, the second field effect transistor Q2 flows to the next battery 1 through the path, at the moment, the part of current and the cathode current of the battery 1 cannot directly flow to the cathode IN of the input end of the DC/DC power supply 2 because the third diode D3 and the fourth diode D4 are conducted IN a single direction, the inductor accumulates a part of energy at the moment, because the input voltage of the DC/DC power supply 2 is higher than the voltage of the series battery 1, at the moment, the current cannot flow to the anode IN of the input end of the DC/DC power supply 2 through the path of the first inductor L1, the first diode D1, the second diode D2 and the third field effect transistor Q3, at this time, it can be ensured that the current of the following battery 1 is not changed, and because of the unidirectional conduction of the second diode D2, the positive electrode IN + of the input end of the DC/DC direct-current power supply 2 cannot charge the first capacitor C1;
the second state: the first fet Q1 is turned on, the second fet Q2 and the third fet Q3 are turned off, and since the current in the inductor cannot change suddenly, the current output by the DC/DC power supply 2 is divided into two parts: one part is current on the inductor, because of the unidirectional conduction of the third diode D3, the current will flow to the next battery 1 through the loop of the first inductor L1, the first diode D1, the first capacitor C1 and the fourth diode D4 in sequence, and at the same time charge the first capacitor C1, while the other part will flow to the next battery 1 through the loop of the positive pole of the battery 1 and the negative pole of the battery 1 through the first field effect transistor Q1, so that the current of the next battery 1 can be ensured to be unchanged;
the third state: the first field effect transistor Q1, the second field effect transistor Q2 and the third field effect transistor Q3 are turned on, and the output of the DC/DC direct current power supply 2 is divided into two parts: a part of the current flows from the first field effect transistor Q1 to the anode of the battery 1, and the cathode of the battery 1 flows to the next battery 1; the other part will flow through the path of the second fet Q2 to the next battery 1 through the first inductor L1, at this time, because the third diode D3 and the fourth diode D4 are turned on IN one direction, the part of the current and the battery 1 cathode current cannot flow directly to the cathode IN of the input terminal of the DC/DC power supply 2, at this time, the inductor will accumulate a part of energy, because the voltage input by the DC/DC power supply 2 is higher than the voltage of the series battery 1, at this time, the current will not flow to the anode IN + of the input terminal of the DC/DC power supply 2 through the path of the first inductor L1, the first diode D1, the second diode D2 and the third fet Q3, at this time, it can be ensured that the current of the following battery 1 does not change, and because the first inductor L1 charges the first capacitor IN the second state, at this time, there will be a certain voltage across the first capacitor, if the voltage at the two ends of the first capacitor is larger than the voltage of the anode IN + of the input end of the DC/DC direct-current power supply 2, the first capacitor flows through the anode of the first capacitor through the second diode D2, the third field-effect tube Q3, the anode IN + of the input end of the DC/DC direct-current power supply 2, the cathode IN-of the input end of the DC/DC direct-current power supply 2, the third diode D3 and returns to the cathode of the first capacitor to feed back energy;
and S2, continuously repeating the second state and the third state, so that the constant voltage of a single battery 1 can be realized in the serial connection state of the batteries 1, the current output by other batteries 1 and the DC/DC direct-current power supply 2 is not influenced, and the redundant energy when the battery 1 is in the constant voltage can be fed back to the input end of the DC/DC direct-current power supply 2.
In the embodiment, the first field effect transistor Q1 is directly controlled by a main controller, the main controller opens the first field effect transistor Q1 when the process step starts, closes the first field effect transistor Q1 when the process step ends, the battery constant-current constant-voltage switching is performed by the controller 4-3, the voltage acquisition link acquires the battery voltage, compares the real-time battery voltage with the set value voltage, when the battery voltage does not reach the set value, the controller 4-3 does not generate a control signal, the PWM generator 4-4 does not work, and at the moment, the battery performs the constant-current charging process step. When the voltage of the battery reaches a set value, the controller 4-3 outputs a signal to control the PWM generator 4-4 to generate PWM waves, the PWM waves are transmitted to the second field-effect tube Q2 and the third field-effect tube Q3 of the constant voltage module after the driving capability of the driving chip 4-5 is strengthened, at the moment, the battery enters a constant voltage charging state, the duty ratio of the PWM waves is controlled by the controller 4-3, and the control signal of the controller 4-3 is determined by the deviation of the set value and the current voltage of the battery.
The following technical advantages are thus achieved by the invention:
1. the battery constant-current processing step can be realized in the state that the batteries are connected in series, and meanwhile, the constant-voltage processing step can be realized on a single battery.
2. In the single-battery constant-voltage process step, redundant energy is fed back to the input end of the DCDC, and the energy is recycled, so that the energy is prevented from being consumed without any reason.
3. The cost of the variable capacity power supply is reduced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a series battery monomer constant voltage circuit, includes more than one battery (1) of establishing ties each other and at series battery (1) both ends and for DC power supply (2) of series battery (1) power supply, its characterized in that: the two ends of each battery (1) are connected in parallel with a battery constant voltage unit (3) for controlling the constant voltage state of the battery (1), all the battery constant voltage units (3) are connected to a control unit (4) for controlling the state of the battery constant voltage unit (3), the feedback positive end of each battery constant voltage unit (3) is connected with the positive electrode of the input end of the DC/DC direct-current power supply (2), the feedback negative end of each battery constant voltage unit (3) is connected with the negative electrode of the input end of the DC/DC direct-current power supply (2), and the mode of the control unit (4) for controlling the state of the constant voltage power supply can realize the integral constant current working step of the battery (1) and can also realize the constant voltage working step of a single battery (1); in addition, when the single battery (1) is in a constant voltage process step, redundant energy is fed back to the input end of the DC/DC power supply (2).
2. The series-connected battery cell constant voltage circuit according to claim 1, wherein: the control unit (4) realizes the specific steps of the overall constant current process step: when one battery constant voltage unit (3) does not work, the current flowing through each battery (1) is consistent with the output current of the DC/DC direct current power supply (2); when a certain battery (1) enters a constant voltage state, the current flowing through the battery (1) is reduced by the battery constant voltage unit (3) in order to keep the constant voltage state of the battery (1), the reduced current flows to the next battery (1) through the battery constant voltage unit (3), so that the current of other batteries (1) and the current on the series loop of the batteries (1) are kept unchanged in the constant current stage, and meanwhile, the battery constant voltage unit (3) can feed redundant energy on the constant voltage battery (1) back to the input end of the DC/DC direct current power supply (2) for cyclic utilization.
3. The series-connected battery cell constant voltage circuit according to claim 1 or 2, wherein: each battery constant voltage unit (3) comprises a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3, a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a first inductor L1, the pin D of the third field effect transistor Q3 is connected with the cathode of a second diode D2, the anode of the second diode D2 is connected with the pin D of the second field effect transistor Q2 through a first diode D1, the pin S of the second field effect transistor Q2 is connected with the cathode of a DC/DC direct current power supply (2) through a fourth diode D4 and a third diode D3 which are connected in series, the pin D of the second field effect transistor Q2 is also connected with the pin S of the first field effect transistor Q1 through a first inductor L1, the pin D of the first field effect transistor Q1 is connected with the anode of a corresponding battery (1), and the cathode of the same battery (1) is connected with the pin S2 of the second field effect transistor Q3, the control unit (4) comprises a master controller (4-1), a D/A converter (4-2) and an A/D converter (4-7), the D/A converter (4-2) and the A/D converter (4-7) are connected with the master controller (4-1), the master controller (4-1) is connected with a controller (4-3) through the D/A converter (4-2), the output of the controller (4-3) is connected with a PWM generator (4-4), the output of the PWM generator (4-4) is connected with a G pin of a second field effect transistor Q2 and a G pin of a third field effect transistor Q3 through a driving chip (4-5), the output of the master controller (4-1) is directly connected with the G pin of a first field effect transistor Q1 to realize the direct control of the first field effect transistor Q1, and a voltage sampling unit (4-6) is connected between the A/D converter (4-7) and the controller (, the voltage sampling unit (4-6) is connected with the battery (1) to collect and transmit the voltage of the battery (1) to the A/D converter (4-7).
4. The series-connected battery cell constant voltage circuit according to claim 3, wherein: a first capacitor C1 is connected between the common end of the first diode D1 and the second diode D2 and the fourth diode D4 and the third diode D3, and a second capacitor C2 is connected between the S-leg of the first field effect transistor Q1 and the S-leg of the second field effect transistor Q2.
5. The method of claim 4, wherein the method further comprises the steps of:
s1, when the battery (1) is in a constant current stage, the first field effect transistor Q1 is conducted, the second field effect transistor Q2 and the third field effect transistor Q3 are closed, the current output by the DC/DC direct current power supply (2) flows through the battery (1) after flowing through the first field effect transistor Q1, and the current of the battery (1) connected in series at the moment is equal to the current output by the DC/DC direct current power supply (2); when the series battery (1) enters a constant voltage state, the two switching tubes of the second field effect tube Q2 and the third field effect tube Q3 enter a high-frequency switching state, and the first field effect tube Q1 keeps a conducting state; the following three states are then completed:
the first state: the first field effect transistor Q1, the second field effect transistor Q2 and the third field effect transistor Q3 are conducted, the output of the DC/DC direct current power supply (2) is divided into two parts, one part enters the anode of the battery (1) from the first field effect transistor Q1 and then flows to the next battery (1) through the cathode of the battery (1), the other part flows through the first inductor L1, the second field effect transistor Q2 flows to the next battery (1) through the path, at the moment, because the third diode D3 and the fourth diode D4 are conducted IN a single direction, the part of current and the current of the cathode of the battery (1) cannot directly flow to the cathode IN of the input end of the DC/DC direct current power supply (2), at the moment, a part of energy can be accumulated by the inductor, because the voltage input by the DC/DC direct current power supply (2) is higher than the voltage of the batteries (1) connected IN series, at the moment, the current cannot pass through the first inductor L1, the, The path of the second diode D2 and the third field effect transistor Q3 flows to the positive electrode IN + of the input end of the DC/DC direct current power supply (2), and at the moment, the current of a rear battery (1) can be ensured to be unchanged, and at the moment, because of the unidirectional conduction of the second diode D2, the positive electrode IN + of the input end of the DC/DC direct current power supply (2) can not charge the first capacitor C1;
the second state: the first field effect transistor Q1 is turned on, the second field effect transistor Q2 and the third field effect transistor Q3 are turned off, and the current output by the DC/DC direct current power supply (2) is divided into two parts because the current on the inductor cannot change suddenly: one part is current on the inductor, because of the unidirectional conduction of the third diode D3, the current will flow to the next battery (1) through the loop of the first inductor L1, the first diode D1, the first capacitor C1 and the fourth diode D4 in sequence, and at the same time charge the first capacitor C1, while the other part will flow to the next battery (1) through the loop of the positive pole of the battery (1) and the negative pole of the battery (1) through the first field-effect tube Q1, so as to ensure that the current of the next battery (1) is not changed;
the third state: the first field effect transistor Q1, the second field effect transistor Q2 and the third field effect transistor Q3 are conducted, and the output of the DC/DC direct current power supply (2) is divided into two parts: one part flows from the first field effect transistor Q1 to the positive pole of the battery (1), and the negative pole of the battery (1) flows to the next battery (1); the other part will flow through the path of the second fet Q2 to the next battery (1) through the first inductor L1, at this time, because the third diode D3 and the fourth diode D4 are turned on IN one direction, the part of current and the battery (1) cathode current cannot flow directly to the cathode IN of the input terminal of the DC/DC power supply (2), and the inductor will accumulate a part of energy at this time, because the voltage input by the DC/DC power supply (2) is higher than the voltage of the series-connected batteries (1), at this time, the current will not flow to the anode IN + of the input terminal of the DC/DC power supply (2) through the path of the first inductor L1, the first diode D1, the second diode D2 and the third fet Q3, and at this time, it can be ensured that the current of the following battery (1) does not change, and because the first inductor L1 charges the first capacitor at the second state, there will be a certain voltage across the first capacitor at this time, if the voltage at the two ends of the first capacitor is larger than the voltage of the anode IN + of the input end of the DC/DC direct current power supply (2), the first capacitor flows through the anode of the first capacitor through the second diode D2, the third field effect tube Q3, the anode IN + of the input end of the DC/DC direct current power supply (2), the cathode IN-of the input end of the DC/DC direct current power supply (2), the third diode D3 and returns to the loop of the cathode of the first capacitor to feed back energy;
and S2, continuously repeating the work of the second state and the third state, so that the constant voltage of a single battery (1) can be realized in the state that the batteries (1) are connected in series, the current output by other batteries (1) and the DC/DC direct-current power supply (2) is not influenced, and the redundant energy when the batteries (1) are in the constant voltage can be fed back to the input end of the DC/DC direct-current power supply (2).
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| CN202011166447.8A CN112271777B (en) | 2020-10-27 | 2020-10-27 | Series battery monomer constant voltage circuit and control method thereof |
| KR1020217025347A KR102786845B1 (en) | 2020-10-27 | 2020-11-04 | Serial battery single-voltage electric circuit and its control method |
| PCT/CN2020/126330 WO2022088210A1 (en) | 2020-10-27 | 2020-11-04 | Series battery cell constant-voltage circuit and control method therefor |
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| WO2022088210A1 (en) | 2022-05-05 |
| KR20220058838A (en) | 2022-05-10 |
| CN112271777B (en) | 2022-07-01 |
| KR102786845B1 (en) | 2025-03-27 |
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