CN109038754B - Battery pack balancing system and method for applying battery pack balancing system - Google Patents
Battery pack balancing system and method for applying battery pack balancing system Download PDFInfo
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- CN109038754B CN109038754B CN201810981212.0A CN201810981212A CN109038754B CN 109038754 B CN109038754 B CN 109038754B CN 201810981212 A CN201810981212 A CN 201810981212A CN 109038754 B CN109038754 B CN 109038754B
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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
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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Abstract
The invention relates to a battery pack balancing system and a method for applying the battery pack balancing system, wherein the system comprises a battery management system, a battery pack and a balancing module, wherein the battery management system supplies power to the battery pack and the balancing module; the balancing module comprises a battery detection module, a plurality of conversion modules, a charging module and an electric power storage module. The method comprises the steps that a battery detection module judges the state of a battery pack firstly, when the battery pack is confirmed to be in a charging state, a charging module carries out equalizing charge on one or more batteries meeting the starting equalizing condition through a plurality of conversion modules, and when the battery pack is confirmed to be in a discharging state or a standing state, an electric storage module carries out equalizing charge on one or more batteries meeting the starting equalizing condition through a plurality of conversion modules. The invention has the characteristics of reducing the voltage difference among the batteries in the battery pack, improving the service efficiency and the whole capacity of the battery pack and prolonging the service life of the battery pack.
Description
Technical Field
The invention relates to the technical field of battery equalization systems, in particular to a battery pack equalization system and a method for applying the battery pack equalization system.
Background
With the development of new energy technologies, more and more fields to which new energy technologies are applied, such as the field of electric vehicles and the like, use battery packs as main power supplies, so that the application range of the battery packs is wider.
In the battery pack, due to various factors such as different chemical characteristics and self-discharge rates in the battery cells of each battery, different influences of temperature changes on each battery cell and the like, after the battery pack is used for a period of time, certain differences can occur among the battery cells in each battery, voltage differences appear on the voltages, voltage imbalance among the batteries occurs, and therefore the performance of the battery cells in a single battery is reduced, the whole battery pack is affected, and the service efficiency, the whole capacity and the service life of the whole battery pack are reduced.
Disclosure of Invention
It is a first object of the present invention to provide a system for battery equalization that reduces voltage magnitude differences between individual cells in a battery.
A second object of the present invention is to provide a method of applying a battery equalization system that improves the efficiency of use, the overall capacity, and the lifespan of a battery pack.
In order to achieve the first object, the present invention provides a battery pack balancing system, which includes a battery management system, a battery pack, and a balancing module, wherein the battery management system supplies power to the battery pack and the balancing module; the equalizing module comprises a battery detecting module, a plurality of conversion modules, a charging module and an electric power storage module, the battery detecting module is electrically connected with the battery management system, the battery detecting module is also electrically connected with the charging module, each conversion module receives a control signal output by the battery detecting module respectively, two terminals of each battery in the battery pack are connected to the battery detecting module respectively, the charging module outputs voltage to the plurality of conversion modules and the electric power storage module, the electric power storage module also outputs voltage to the plurality of conversion modules, and after each conversion module converts the received high voltage into low voltage, at least two batteries in the battery pack are powered.
According to the scheme, the battery management system comprises the power supply, is a system for managing the power supply and can control the power supply to supply power to the battery pack and the balancing module. The battery detection module in the equalization module can detect the voltage and the current of each battery in the battery pack. The battery detection module can also control the charging module to output voltages to the plurality of conversion modules and the electric storage module, and the electric storage module can also output voltages to the plurality of conversion modules, so that the battery detection module can control the plurality of conversion modules to be opened according to a detection result, and then additionally charges one or more batteries in the battery pack, thereby achieving the purpose of reducing the voltage difference among the batteries in the battery pack.
Preferably, a switching circuit is further provided between the power storage module and the plurality of conversion modules, and the switching circuit is further electrically connected to the charging module.
Therefore, when the charging module supplies power to the plurality of conversion modules, the charging module can cut off the power supply of the power storage module to the plurality of conversion modules through the control of the switch circuit, and the waste of the electric quantity of the power storage module is avoided.
The further scheme is that each conversion module comprises a control circuit, a voltage reduction circuit and at least more than two conversion circuits, the voltage reduction circuit reduces the received voltage and outputs a low voltage to the control circuit, and the at least more than two conversion circuits respectively receive the low voltage
The control circuit outputs a control signal.
Therefore, the voltage reduction circuit can reduce the received voltage and then output a low voltage to the control circuit to work, and the control circuit sends a control signal to control the conversion circuit to work.
Preferably, each control circuit receives the control signal output by the battery detection module.
Therefore, the battery detection module controls the conversion circuit by controlling the control circuit.
Preferably, each of the conversion circuits is connected to a corresponding one of two terminals of one of the cells in the battery pack.
Thus, the battery detection module can additionally charge the single battery of the battery pack by controlling one conversion circuit.
In order to achieve the second objective, the present invention provides a method for applying a battery pack balancing system, where the balancing system includes a battery management system, a battery pack, and a balancing module, and the battery management system supplies power to the battery pack and the balancing module; the balancing module comprises a battery detection module, a plurality of conversion modules, a charging module and an electric power storage module, the battery detection module is electrically connected with the battery management system, the battery detection module is also electrically connected with the charging module, each conversion module receives a control signal output by the battery detection module respectively, two terminals of each battery in the battery pack are connected to the battery detection module respectively, the charging module outputs voltage to the conversion modules and the electric power storage module, the electric power storage module also outputs voltage to the conversion modules, and each conversion module converts the received high voltage into low voltage and then supplies power to at least two batteries in the battery pack; the method comprises the following steps: the battery detection module judges the state of the battery pack firstly; when the battery pack is confirmed to be in a charging state, the battery detection module detects the voltage of each battery in the battery pack and judges whether one or more batteries in the battery pack accord with the starting equalization condition or not, if so, the charging module performs equalization charging on one or more batteries which accord with the starting equalization condition through the plurality of conversion modules and also charges the electric storage module, and after the battery detection module detects that the charged one or more batteries do not accord with the equalization condition, the battery detection module stops equalization charging on one or more batteries which do not accord with the equalization condition; when the battery pack is determined to be in a discharging state or a standing state, the battery detection module detects the voltage of each battery in the battery pack and judges whether one or more batteries in the battery pack accord with a starting equalization condition or not, if so, the power storage module performs equalization charging on the one or more batteries which accord with the starting equalization condition through the plurality of conversion modules, and if not, the battery detection module stops the equalization charging on the one or more batteries which do not accord with the equalization condition.
According to the scheme, the battery detection module can detect the state of the battery pack and the voltage of each battery in the batteries. When the battery pack is in a charging state, the charging module additionally charges the battery pack and simultaneously charges the power storage module, but the power storage module does not charge the battery pack. When the battery pack is in a discharging state or a standing state, the storage module charges the battery pack.
The further scheme is that the condition for judging whether one or more batteries in the battery pack accord with the balance starting condition is that the battery detection module detects the voltage value of each battery in the battery pack, and one or more batteries with small voltage values in the screened battery pack accord with the balance starting condition.
Therefore, after the battery detection module detects the voltage value of each battery of the battery pack, one or more batteries with low voltage in the battery pack are screened out according to the detection result, and the screened one or more batteries meet the condition of starting equalization. The voltage difference of each battery in the battery pack is reduced by charging the batteries with low voltage in the battery pack, and the purposes of improving the overall service efficiency, the overall capacity and the service life of the battery pack are achieved.
A switch circuit is further arranged between the power storage module and the plurality of conversion modules, and the switch circuit is also electrically connected with the charging module; when the battery pack is in a charging state, the charging module is used for charging the electric power storage module and then cutting off a line between the electric power storage module and the conversion module through the switching circuit.
Therefore, in the charging state, the charging module controls the electric storage module not to supply power to the battery pack through the switch circuit, and in the non-charging state, the electric storage module supplies power to the battery pack through the conversion module.
The further scheme is that each conversion module comprises a control circuit, a voltage reduction circuit and at least more than two conversion circuits, the voltage reduction circuit reduces the received voltage and outputs a low voltage to the control circuit, the at least more than two conversion circuits respectively receive control signals output by the control circuit, and each conversion circuit is correspondingly connected with two terminals of one battery in the battery pack; the battery detection module controls the on and off of the plurality of conversion circuits to perform equalizing charge and stop equalizing charge on one or more batteries meeting the equalizing condition in the battery pack.
Therefore, each conversion circuit is electrically connected with one battery in the battery pack, and the battery detection module controls the switch of the conversion circuit through the control signal, so that the aim of additionally charging only the batteries meeting the equalization condition is fulfilled.
In a further aspect, the battery detection module detects a current flowing condition of the battery pack to determine a state of the battery pack.
Therefore, the battery detection module can detect the direction and the magnitude of the current of the battery pack through the control chip and the related peripheral circuit, so as to judge the state of the battery pack.
Drawings
Fig. 1 is a block diagram of a system for battery equalization according to an embodiment of the present invention.
Fig. 2 is an electrical schematic diagram of a switching circuit for controlling the power storage module to supply power to a plurality of conversion modules in the battery pack balancing system embodiment of the present invention.
Fig. 3 is an electrical schematic diagram of a conversion module in a system embodiment of battery equalization of the present invention.
Fig. 4 is an electrical schematic diagram of a first conversion circuit of a conversion module in a system embodiment of battery equalization of the present invention.
Fig. 5 is an electrical schematic diagram of a second conversion circuit of the conversion module in the system embodiment of battery equalization of the present invention.
Fig. 6 is an electrical schematic diagram of the voltage step-down circuit of the conversion module in the system embodiment of battery equalization of the present invention.
The invention is further explained with reference to the drawings and the embodiments.
Detailed Description
Referring to fig. 1, a battery pack balancing system of the present embodiment includes a battery management system 2, a balancing module 3, and a battery pack 10. The battery management system 2 includes a control center BMS and a power supply, and the power supply provided in this embodiment outputs a dc voltage, so the power supply may be a battery. The control center BMS controls the power supply to the balancing module 3 and the battery pack 10. The battery pack 10 includes a battery 11 and a battery 12 and a plurality of batteries.
The equalizing module 3 includes a battery detection module 4, a plurality of conversion modules 20, a charging module 30, an electric power storage module 32 and a switch circuit 34, wherein the battery management system 2 directly supplies power to the battery detection module 4 and the charging module 30 in the equalizing module 3, the charging module 30 outputs the received voltage to the plurality of conversion modules 20 and the electric power storage module 32, the electric power storage module 32 also outputs the voltage to the plurality of conversion modules 20, and the plurality of conversion modules 20 convert the received voltage into a low voltage and output the low voltage to at least two batteries in the battery pack 10. Preferably, the charging module 30 may be a charging device such as a charger capable of efficiently performing charging and discharging, and may also receive a control signal. And the power storage module 32 may be a dry cell battery including a plurality of dry cells connected in series or a storage battery, which can effectively store power.
The battery detection module 4 is electrically connected to the battery management system 2 and the plurality of conversion modules 20, respectively. In this embodiment, the battery detection module 4 is an intelligent chip such as a BQ76940+ STM3 chip and a corresponding peripheral circuit integrated, the battery detection module 4 may receive a control signal sent by the battery management system 2 to operate, and the battery detection module 4 may also send a control signal to the plurality of conversion modules 20, so as to control the conduction of the conversion modules 20.
The positive terminal and the negative terminal of each battery in each battery pack 10 are electrically connected to the battery detection module 4, so that the battery detection module 4 can detect the voltage of each battery in the battery pack 10 and also detect the current flowing condition of the whole battery pack 10, and preferably, the battery detection module 4 can send the current information in the whole battery pack and the voltage information of each battery to the battery management system 2 for recording. Of course, the battery detection module 4 may also screen out one or more batteries with a smaller voltage value according to the detected voltage value of each battery in the battery pack 10.
Referring to fig. 1, the balancing module further includes a switching circuit 34 disposed between the power storage module 32 and the plurality of conversion modules 20, and the switching circuit 34 has one end electrically connected to the charging module 30, and the function of the switching circuit 34 will be further described with reference to fig. 2.
Referring to fig. 2, the switching circuit 34 includes a switching tube Q1, a switching tube Q2, a switching tube Q3, a diode D1, a resistor R1, a resistor R2, a resistor R3, and a resistor R4. The drain of the switching tube Q1 is electrically connected to the first voltage input end of the plurality of conversion modules 20, the source of the switching tube Q1 is electrically connected to the first voltage output end of the resistor R1, the diode D1 and the power storage module, the resistor R1 is electrically connected to the gate of the switching tube Q1 and the drain of the switching tube Q2, the second end of the diode D1 is electrically connected to the gate of the switching tube Q2, the first end of the resistor R2 and the drain of the switching tube Q3, the second end of the resistor R2 is electrically connected to the drain of the switching tube Q2 and the second output end of the power storage module 32, the source of the switching tube Q3 is electrically connected to the first end of the resistor R4, the gate of the switching tube Q3 is electrically connected to the second end of the resistor R4 and the first end of the resistor R3, and the second end of the resistor R3 is electrically connected to the second voltage output end of the.
When the entire battery pack 10 is in a charging state, the charging module 30 outputs a voltage to charge the power storage module 32, and at the same time, the charging module 30 outputs a voltage to the resistor R3, the resistor R3 generates a current to make the switching tube Q3 be at a high level, and since the conduction characteristic of the switching tube Q3 is that the high level is conducted, the switching tube Q3 is conducted at the high level. After the switching tube Q3 is turned on, the switching tube Q2 is in a low level state, and since the on characteristic of the switching tube Q2 is also turned on in a high level state, the switching tube Q2 is turned off, and the diode D1 is turned off in a reverse direction, so that the switching tube Q1 is not turned on, and the power supply of the power storage module 32 to the plurality of conversion modules 20 is cut off. Only the charging module 30 supplies power to the plurality of conversion modules 20 at this time.
When the entire battery pack 10 is in the non-charging state, no voltage is output from the charging module 30 to the storage module 32, and the switching tube Q3 is turned off. At this time, the output voltage of the power storage module 30 passes through the diode D1 to make the switching tube Q2 be at a high level, and after the switching tube Q2 is turned on, the switching tube Q1 is at a low level, and since the switching tube Q1 is turned on when the conduction characteristic is a low level, the switching tube Q1 is turned on, and the power storage module 32 can supply power to the plurality of conversion modules. The resistor R1 and the resistor R2 are used for giving an initial level to the switching tube Q2, and the resistor R3 and the resistor R4 are used for giving an initial level to the switching tube Q3.
Therefore, the charging module 30 can cut off the power supply lines of the storage module 32 to the plurality of conversion modules 20 when the battery pack 10 is in a charging state by the switching circuit 34, and the storage module 32 cannot supply power to the battery pack 10 through the plurality of conversion modules. When the battery pack 10 is in the non-charging state, the power supply lines of the power storage module 32 to the plurality of conversion modules 20 are conducted, and the power storage module 32 can supply power to the battery pack 10 through the plurality of conversion modules 20.
The circuit shown in fig. 3 includes a battery 11, a battery 12, and a conversion module 20 for supplying power to the battery 11 and the battery 12, wherein the battery 11 is connected in series with the battery 12, and the conversion module 20 includes a first conversion circuit 21, a second conversion circuit 22, a control circuit 24, and a voltage reduction circuit 25. The first input terminal of the first converter circuit 21 receives the voltage output from the charging module 30 or the storage module 32, and the second input terminal of the first converter circuit 21 receives the PWM1 signal output from the control circuit 24. The first input end of the second conversion circuit 22 receives the voltage output by the charging module 30 or the storage module 32, and the second input end of the first conversion circuit 22 receives the PWM2 signal output by the control circuit 24. Meanwhile, the voltage reduction circuit 25 converts the voltage received from the charging module 30 or the storage module 32 into a low voltage, and outputs the low voltage to the control circuit 24, so that the control circuit 24 can normally operate. The control circuit 24 in this embodiment is integrated by using the SN8P2711A and corresponding peripheral circuits, so the control circuit 24 can receive the control signal from the battery detection module 4 and output the PWM1 signal and the PWM2 signal to control the first converting circuit 21 and the second converting circuit 22. Of course, referring to fig. 2, it can also be seen that the negative terminal of the battery 11 and the positive terminal of the battery 12 are connected to form a common terminal to be electrically connected to the output second terminal of the first converting circuit 21 and the output first terminal of the second converting circuit 22, the positive terminal of the battery 11 is electrically connected to the output first terminal of the first converting circuit 21, and the negative terminal of the battery 12 is electrically connected to the output second terminal of the second converting circuit 22.
Referring to fig. 4, the first conversion circuit 21 includes a terminal Vin0, a terminal PWM1, a terminal Cell1+, a terminal CellCom0, a terminal I0, a terminal V0, a switching tube Q4, a transformer T1, and a first operational amplifier circuit 25. The first conversion circuit 21 receives the voltage output from the charging module 30 or the storage module 32 through the terminal Vin0, and is electrically connected to the control circuit 24 through the terminals PWM1, I0, and V0, electrically connected to the positive terminal of the battery 11 through the terminal Cell1+, and electrically connected to the negative terminal of the battery 11 through the terminal Cellcom 0.
As can be seen from fig. 4, the number of turns of the primary side of the transformer T1 is smaller than that of the secondary side, so the primary first end of the transformer T1 is electrically connected to the terminal Vin0, the primary second end of the transformer T1 is electrically connected to the drain of the switching tube Q4, the secondary first end of the transformer T1 is electrically connected to the terminal Cell1+, and the secondary second end of the transformer T1 is electrically connected to the terminal Cellcom 0. The gate of the switching tube Q4 is electrically connected to the terminal PWM1, and the source of the switching tube Q4 is grounded. Therefore, when the switch Q4 is not turned on, the primary side circuit of the transformer T1 does not form a complete loop, no induced current is generated on the secondary side of the transformer T1, and the transformer T1 does not operate, so that the converter circuit 21 cannot supply power to the battery 11. After receiving the control signal from the battery detection module 4, the control circuit 24 outputs a PWM1 signal to the first conversion circuit, so that the switching transistor Q4 is turned on, the primary side circuit of the transformer T1 forms a current loop, so that an induced current is generated on the secondary side of the transformer T1, and the transformer T1 starts to operate, thereby reducing the voltage input from the terminal Vin0 and supplying power to the battery 11.
Preferably, the output terminal of the first operational amplifier 25 is electrically connected to the terminal I0, and the non-inverting input terminal and the inverting input terminal of the first operational amplifier 25 are electrically connected to the terminal Cell1 +. It can be seen that, when the first conversion circuit 21 charges the battery 11, the first operational amplifier 25 may sample the current signal at the terminal Cell1+, amplify and output the current signal to the control circuit 24, and the control circuit 24 sends the current signal to the battery detection module 4 for recording. More preferably, the output terminal of the second operational amplifier 26 is electrically connected to the terminal V0, and the non-inverting input terminal and the inverting input terminal of the second operational amplifier 26 are electrically connected to the terminal Cell1 +. It can be seen that, when the first conversion circuit 21 charges the battery 11, the first operational amplifier 25 may sample the voltage signal at the terminal Cell1+, amplify and output the voltage signal to the control circuit 24, and the control circuit 24 sends the voltage signal to the battery detection module 4 for recording.
Referring to fig. 5, the second conversion circuit 22 includes a terminal Vin1, a terminal PWM2, a terminal Cell12-, a terminal CellCom1, a terminal I1, a terminal V1, a switching tube Q5, a transformer T2, a first operational amplifier circuit 25, and a second operational amplifier circuit 26. The second conversion circuit 22 receives the voltage output from the charging module 30 or the storage module 32 through the terminal Vin1, and is electrically connected to the control circuit 24 through the terminals PWM2, I1 and V1, electrically connected to the positive terminal of the battery 12 through the terminal C Cellcom1, and electrically connected to the negative terminal of the battery 12 through the terminal Cell 12-.
As can be seen from fig. 5, the number of turns of the primary side of the transformer T2 is smaller than that of the secondary side, so the primary side of the transformer T2 is electrically connected to the terminal Vin1, the primary side of the transformer T2 is electrically connected to the drain of the switching tube Q5, the secondary side of the transformer T2 is electrically connected to the terminal CellCom1, and the secondary side of the transformer T2 is electrically connected to the terminal Cell 12-. The gate of the switching tube Q5 is electrically connected to the terminal PWM2, and the source of the switching tube Q5 is grounded. It can be seen that when the switch Q5 is not turned on, the primary side circuit of the transformer T2 does not form a complete loop, no induced current is generated on the secondary side of the transformer T2, and the transformer T2 does not operate, so that the converter circuit 22 cannot supply power to the battery 12. After receiving the control signal from the battery detection module 4, the control circuit 24 outputs a PWM2 signal to the first conversion circuit, so that the switching transistor Q5 is turned on, the primary side circuit of the transformer T2 forms a current loop, so that an induced current is generated on the secondary side of the transformer T2, and the transformer T2 starts to operate, thereby reducing the voltage input from the terminal Vin1 and supplying power to the battery 12.
Preferably, the output terminal of the first operational amplifier 27 is electrically connected to the terminal I1, and the non-inverting input terminal and the inverting input terminal of the first operational amplifier 26 are electrically connected to the terminals CellCom1, respectively. It can be seen that, when the first conversion circuit 22 charges the battery 12, the first operational amplifier 27 may sample the current signal at the terminal CellCom1, amplify and output the current signal to the control circuit 24, and the control circuit 24 sends the current signal to the battery detection module 4 for recording. Further preferably, the output terminal of the second operational amplifier 28 is electrically connected to the terminal V1, and the non-inverting input terminal and the inverting input terminal of the second operational amplifier 28 are electrically connected to the terminal CellCom1, respectively. It can be seen that, when the first conversion circuit 22 charges the battery 12, the first operational amplifier 28 may sample the voltage signal of the terminal CellCom1, amplify and output the voltage signal to the control circuit 24, and the control circuit 24 sends the voltage signal to the battery detection module 4 for recording.
Therefore, the battery detection module 4 can regard one or more batteries with low voltage in the battery pack 11 as an object meeting the start-up equalization condition according to the voltage detection condition of each battery in the battery pack 11, and additionally charge the one or more batteries in the battery pack 11 meeting the start-up equalization condition by controlling the plurality of conversion modules 20. And the battery detection module 4 also samples and records the current and voltage in the additional charging process through the plurality of conversion modules 20.
The voltage reducing circuit 25 shown in fig. 6 includes a terminal Vin3, a terminal C, a terminal D, a diode D3, a transistor Q10, a resistor R2, a zener diode D4, a resistor R13, a resistor R14, and a capacitor C3, wherein the voltage reducing circuit 25 receives the voltage output by the charging module 30 or the power storage module 32 through the terminal Vin3, and the voltage reducing circuit 25 is further electrically connected to the control circuit 24 through the terminal C and the terminal D. The terminal Vin3 is electrically connected to a first terminal of the diode D3, a second terminal of the diode D3 is electrically connected to a first terminal of the resistor R12 and a collector of the transistor Q10, a second terminal of the resistor R12 is electrically connected to a base electrode of the transistor Q10 and a first terminal of the zener diode D4, an emitter of the transistor Q10 is electrically connected to the terminal D, an emitter of the transistor Q10 is also electrically connected to a first terminal of the resistor R13 and a first terminal of the capacitor C3, a second terminal of the zener diode D4 is electrically connected to a first terminal of the resistor R14, a second terminal of the zener diode D4, a second terminal of the resistor R13, and a second terminal of the capacitor C3 are grounded, and a second terminal of the resistor R14 is electrically connected to the reference voltage terminal C. The diode D3 is used to prevent the current in the circuit from flowing reversely, and the resistor R13 and the capacitor C3 play a role of filtering in the circuit.
After voltage is input from a terminal Vin3, a resistor R12 generates current to flow into a voltage regulator tube D4, and after voltage is stabilized by a voltage regulator diode D4, the current passes through a resistor R14 and is output from a terminal C to a 2.5V voltage control circuit 24. Meanwhile, current flows from the base of the transistor Q10 to turn on the transistor Q10, and the transistor Q10 reduces the voltage by utilizing the voltage drop characteristic of the transistor Q10 when the transistor Q3526 is turned on, and then outputs 5V voltage to the control circuit 24 from the terminal D.
As can be seen, the voltage reducing circuit 25 can receive the voltage output by the charging module 30 or the power storage module 32, convert the voltage into a low voltage, and supply power to the control circuit 24, so that the control circuit 24 operates normally.
A method of applying a battery pack equalization system is described below. The battery detection module 4 firstly detects the current flowing condition of the whole battery pack 11 by using the intelligent chip DS2438 and the corresponding peripheral circuit, and determines whether the battery pack 11 is in a charging state or a discharging or standing state according to the current flowing direction and the current flowing magnitude of the whole battery pack 11.
When the battery detection module 4 determines that the battery pack 10 is in the charging state, the battery detection module 4 screens out one or more batteries with small voltage values in the battery pack 10 according to the detected voltage values of the batteries in the battery pack 10, and if one or more batteries with small voltage values exist, the one or more batteries are judged to meet the condition of starting equalization.
Starting equalizing charge on the one or more batteries, sending a control signal to the charging module 30 by the battery detection module 4, starting the charging module 30 to work, controlling the one or more conversion modules 20 to be opened by the battery detection module 4 and electrically connected with the one or more batteries meeting the equalizing condition, outputting voltage to the one or more conversion modules 20 by the charging module 30, and charging the one or more batteries meeting the equalizing condition after the voltage is reduced by the one or more conversion modules 20. The charging module 30 charges the power storage module 32 at the same time, and the charging module 30 naturally cuts off the line between the power storage module 32 and the plurality of conversion modules 20 by controlling the switch circuit 34, thereby avoiding waste of electric energy of the power storage module 32 in the charging state of the battery pack 10. After completing the additional charging of one or more batteries in the battery pack 10 meeting the equalizing start condition, if the battery detection module 4 detects that the voltage differences in the battery pack 10 are very small or none, the battery detection module 4 closes the opened conversion modules 20, and stops the equalizing charging of the one or more batteries.
When the battery detection module 4 determines that the battery pack 10 is in a discharge state or a standing state, the battery detection module 4 screens out one or more batteries with a small voltage value in the battery pack 10 according to the detected voltage value of each battery in the battery pack 10, and if one or more batteries with a small voltage value exist, the one or more batteries are judged to meet the condition of balanced starting. At this time, since no voltage is output from the charging module 30 to the power storage module 32, the switching circuit 34 cannot cut the line between the power storage module 32 and the plurality of conversion modules 20.
The one or more batteries are charged in an equalizing mode, after the battery detection module 4 controls the one or more conversion modules 20 to be electrically connected with the one or more batteries meeting the equalizing condition to be opened, the power storage module 32 outputs voltage to the one or more conversion modules 20, and the one or more conversion modules 20 charge the one or more batteries meeting the equalizing condition after reducing the voltage. After completing the additional charging of one or more batteries in the battery pack 10 meeting the equalizing start condition, if the battery detection module 4 detects that the difference between the voltage values in the battery pack 10 is very small or none, the battery detection module 4 closes the plurality of opened conversion modules 20, and stops the equalizing charging of the one or more batteries.
Therefore, in the embodiment, one or more batteries meeting the equalization condition in the battery pack can be additionally charged through the battery detection module and the plurality of conversion modules, so that the voltage difference among the batteries in the battery pack is reduced, and the purposes of improving the service efficiency, the overall capacity and the service life of the battery pack are achieved. And the charging module, the power storage module and the switch circuit can be used for additionally charging one or more batteries meeting the balance condition when the battery pack is in a charging state or a non-charging state.
Finally, it should be emphasized that the present invention is not limited to the above-described embodiments, and changes in connection relation of the charging module, the storage module, the conversion module, changes in specific structure of the switching circuit, and the like should also be included in the scope of protection of the claims of the present invention.
Claims (8)
1. A system for balancing battery pack includes
The battery management system supplies power to the battery pack and the balancing module;
the method is characterized in that:
the equalizing module comprises a battery detecting module, a plurality of conversion modules, a charging module and an electric power storage module, the battery detection module is electrically connected with the battery management system, the battery detection module is also electrically connected with the charging module, each conversion module respectively receives the control signal output by the battery detection module, and two terminals of each battery in the battery pack are respectively connected to the battery detection module, the charging module outputs a voltage to the plurality of conversion modules and the storage module when the battery pack is in a charging state, when the battery pack is in a discharging state or a standing state, the electric storage module outputs voltage to the plurality of conversion modules, and each conversion module converts the received high voltage into low voltage and supplies power to at least two batteries in the battery pack;
the storage battery module is characterized in that a switch circuit is further arranged between the plurality of conversion modules and is electrically connected with the charging module, the switch circuit comprises a first switch tube, a second switch tube and a third switch tube, the second switch tube and the third switch tube are switch tubes which are conducted at a high level, a drain electrode of the first switch tube is electrically connected with a first voltage input end of the plurality of conversion modules, a source electrode of the first switch tube is electrically connected with a first voltage output end of the storage battery module and a first diode end, a second end of the diode is electrically connected with a grid electrode of the second switch tube and a drain electrode of the third switch tube, a drain electrode of the second switch tube is electrically connected with a second output end of the storage battery module, a source electrode of the third switch tube is electrically connected with a first resistor end, and a grid electrode of the third switch tube is electrically connected with a second resistor end of the first resistor and a first resistor end of the second resistor And a second end of the second resistor is electrically connected with a second voltage output end of the charging module, a grid electrode of the first switch tube and a drain electrode of the second switch tube are connected with a first end of a third resistor, and a second end of the third resistor is connected to a first end of the diode.
2. The system for battery pack balancing according to claim 1, wherein:
each conversion module comprises a control circuit, a voltage reduction circuit and at least more than two conversion circuits, wherein the voltage reduction circuit reduces the received voltage and outputs a low voltage to the control circuit, and the at least more than two conversion circuits respectively receive the control signals output by the control circuit.
3. A system for battery equalization according to claim 2, characterized by:
and each control circuit receives the control signal output by the battery detection module respectively.
4. A system for battery equalization according to claim 2, characterized by:
each conversion circuit is correspondingly connected with two terminals of one battery in the battery pack.
5. A method for applying a battery pack equalization system, the equalization system comprising a battery management system, a battery pack, and an equalization module, the battery management system supplying power to the battery pack and the equalization module; the method is characterized in that: the balancing module comprises a battery detection module, a plurality of conversion modules, a charging module and an electric power storage module, the battery detection module is electrically connected with the battery management system, the battery detection module is also electrically connected with the charging module, each conversion module receives a control signal output by the battery detection module, two terminals of each battery in the battery pack are connected to the battery detection module respectively, the charging module outputs voltage to the conversion modules and the electric power storage module, the electric power storage module also outputs voltage to the conversion modules, and each conversion module converts the received high voltage into low voltage and then supplies power to at least two batteries in the battery pack;
the method is characterized by comprising the following steps:
the battery detection module judges the state of the battery pack firstly;
when the battery pack is confirmed to be in a charging state, the battery detection module detects the voltage of each battery in the battery pack and judges whether one or more batteries in the battery pack accord with a starting equalization condition or not, if so, the charging module performs equalization charging on the one or more batteries which accord with the starting equalization condition through the plurality of conversion modules and also charges the electric storage module, and after the battery detection module detects that the charged one or more batteries do not accord with the equalization condition, the battery detection module stops equalization charging on the one or more batteries which do not accord with the equalization condition;
when the battery pack is determined to be in a discharging state or a standing state, the battery detection module detects the voltage of each battery in the battery pack and judges whether one or more batteries in the battery pack accord with a starting equalization condition or not, if so, the electric power storage module performs equalization charging on the one or more batteries which accord with the starting equalization condition through the plurality of conversion modules, and after the battery detection module detects that the charged one or more batteries do not accord with the equalization condition, the battery detection module stops the equalization charging on the one or more batteries which do not accord with the equalization condition;
the storage battery module is characterized in that a switch circuit is further arranged between the plurality of conversion modules and is electrically connected with the charging module, the switch circuit comprises a first switch tube, a second switch tube and a third switch tube, the second switch tube and the third switch tube are switch tubes which are conducted at a high level, a drain electrode of the first switch tube is electrically connected with a first voltage input end of the plurality of conversion modules, a source electrode of the first switch tube is electrically connected with a first voltage output end of the storage battery module and a first diode end, a second end of the diode is electrically connected with a grid electrode of the second switch tube and a drain electrode of the third switch tube, a drain electrode of the second switch tube is electrically connected with a second output end of the storage battery module, a source electrode of the third switch tube is electrically connected with a first resistor end, and a grid electrode of the third switch tube is electrically connected with a second resistor end of the first resistor and a first resistor end of the second resistor A second end of the second resistor is electrically connected with a second voltage output end of the charging module, a grid electrode of the first switch tube and a drain electrode of the second switch tube are connected with a first end of a third resistor, and a second end of the third resistor is connected to a first end of the diode;
when the battery pack is in a charging state, the charging module is used for charging the electric power storage module, and the charging module is used for cutting off a line between the electric power storage module and the conversion module through the switch circuit.
6. The method of claim 5, wherein the battery equalization system further comprises: the condition for judging whether one or more batteries in the battery pack meet the starting balance condition is that the battery detection module screens out one or more batteries with small voltage values in the battery pack according to the detected voltage value of each battery in the battery pack and the balance starting condition is met.
7. A method of applying a battery pack equalization system according to claim 5 or 6, characterized in that:
each conversion module comprises a control circuit, a voltage reduction circuit and at least more than two conversion circuits, the voltage reduction circuit reduces the received voltage and outputs low voltage to the control circuit, the at least more than two conversion circuits respectively receive control signals output by the control circuit, and each conversion circuit is correspondingly connected with two terminals of one battery in the battery pack;
the battery detection module controls the plurality of conversion circuits to be turned on and off to perform equalizing charge and stop equalizing charge on one or more batteries meeting the equalizing condition in the battery pack.
8. A method of applying a battery pack equalization system according to claim 5 or 6, characterized in that:
the battery detection module judges the state of the battery pack by detecting the current flowing condition of the battery pack.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810981212.0A CN109038754B (en) | 2018-08-27 | 2018-08-27 | Battery pack balancing system and method for applying battery pack balancing system |
| PCT/CN2018/108600 WO2020042270A1 (en) | 2018-08-27 | 2018-09-29 | Battery pack equalization system and working method for battery pack equalization system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810981212.0A CN109038754B (en) | 2018-08-27 | 2018-08-27 | Battery pack balancing system and method for applying battery pack balancing system |
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| CN109038754B true CN109038754B (en) | 2021-06-08 |
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| CN110854959B (en) * | 2019-11-22 | 2022-06-14 | 哈尔滨光宇电源股份有限公司 | Passive equalization method for battery system |
| CN113376532A (en) * | 2020-02-25 | 2021-09-10 | 北京新能源汽车股份有限公司 | Detection method, device and system for battery pack balancing module |
| CN111864844B (en) * | 2020-07-27 | 2022-03-08 | 中创新航科技股份有限公司 | Equalization method and equalization device of battery system and intelligent equipment |
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| CN109038754A (en) | 2018-12-18 |
| WO2020042270A1 (en) | 2020-03-05 |
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