CN203813474U - A charging system for a power battery - Google Patents

Abstract

The utility model relates to a technical field that charges, specifically speaking relates to a power battery's charging system. The utility model discloses a controller, voltage detection unit, fill machine and battery charging seat a little, the controller is connected with the control end that fills the machine a little, and fill the machine a little and be connected with the power end of battery charging seat, voltage detection unit's sense terminal with the power end is connected, and voltage detection unit's output and controller are connected. When the battery pack is charged, the battery can be charged in different modes, and the charging effect is good; and secondly, the balance charging can be carried out according to different capacities of the battery, so that the service life of the battery is prolonged.

Description

A charging system for a power battery

technical field

The utility model relates to the technical field of charging, in particular to a charging system for a power battery.

Background technique

The types of power batteries include lithium-ion batteries, lead-acid batteries and nickel-metal hydride batteries. Among them, because of its high specific energy, lithium-ion batteries are widely used in electric vehicles, electric ships, electric robots and other fields to save energy and protect the environment. In view of the wide application of power batteries, many micro-chargers for power batteries have appeared on the market, and these micro-chargers generally only use constant current charging or constant voltage charging, which is not conducive to the use of power batteries and reduces their use. life.

Contents of the invention

The purpose of the utility model is to solve the deficiencies of the prior art and provide a charging system for a power battery. The charging system can be adjusted according to the charging state of the battery to prolong the service life of the battery.

In order to achieve the above object, the technical solution adopted by the utility model is:

A charging system for a power battery, comprising a controller, a voltage detection unit, a microcharger and a battery charging stand, the controller is connected to the control terminal of the microcharger, the microcharger is connected to the power supply terminal of the battery charging stand, and the voltage detection unit The detection terminal of the voltage detection unit is connected with the power supply terminal, and the output terminal of the voltage detection unit is connected with the controller.

The utility model detects the voltage at both ends of the rechargeable battery through the voltage detection unit, and feeds back the voltage signal to the controller. The controller controls the charging mode of the micro-charger according to the voltage signal, thereby achieving a good charging mode and prolonging the service life of the battery.

The controller here can use a switch circuit to send different current signals to the micro charger according to different voltage signals. The micro-charger charges the rechargeable battery with constant current or constant voltage according to the current signal.

Further, the charging system includes a plurality of micro chargers and a plurality of battery charging stands, and the micro chargers correspond to the battery charging stands one by one.

When the power battery is in use, a plurality of power batteries are generally connected in series, so when charging the battery pack, each power battery needs to be charged. Therefore design a plurality of micro-chargers and battery charging stands. Secondly, when the power battery pack is used in a motor vehicle, since the power battery may have different models, it needs to be charged separately, avoiding series charging will cause some power batteries to supply external power, which will affect the life of the power battery.

Furthermore, the charging system also includes a voltage detection unit, the detection terminals of the voltage detection unit are respectively connected to each battery charging stand, and the output terminals of the voltage detection unit are connected to the controller,

Due to the different types of power batteries, the power storage of the power batteries may vary. When charging different types of power batteries, their balance needs to be considered. At this time, the controller is equipped with a chip, which is used to analyze the charging mode control for charging the power battery; to make the power of each power battery in the battery pack in a balanced state, and to avoid some power batteries not supplying power to the outside during the use of the power battery. , In charging state. In the specific operation, the voltage of each rechargeable battery is detected by the voltage detection unit, and then the charging status of each rechargeable battery is monitored. The charging status is fed back to the controller through the current signal, and the controller controls the charging mode of the micro charger. . The voltage detection unit may employ a voltage detection circuit.

Further, the charging system further includes a thermal control system, the thermal control system includes a fan and a temperature sensor, the temperature sensor is set on the battery charging stand, the output terminal of the temperature sensor is connected to the controller, and the controller is connected to the control terminal of the fan.

Set up a thermal control system to control the temperature of the battery during charging. The battery will generate heat during charging, which will lead to changes in the resistance of the battery and changes in internal substances; thus affecting the charging effect; therefore, it is necessary to control the heating temperature of the battery.

Further, the micro-charger includes an AC/DC module, a flyback switching power supply circuit and a synchronous rectification BUCK circuit connected in sequence;

The AC/DC module is connected to the mains, and converts the mains into low-voltage direct current; and transmits the direct current to the flyback switching power supply circuit;

The flyback switching power supply circuit steps down the current output by the AC/DC module; transmits the step-down current to the synchronous rectification BUCK circuit;

The synchronous rectification BUCK circuit rectifies the stepped-down current and outputs constant current or constant voltage to the battery.

The AC/DC module can use a half-wave rectifier circuit.

Further, the flyback switching power supply circuit includes a transformer, and the transformer includes a primary coil and a secondary coil; the current input terminal of the primary coil is connected to the output terminal of the AC/DC module, and also includes a flyback switching power supply controller , the flyback switching power supply controller receives the control signal sent by the controller, and controls the on-off of the flyback switching power supply circuit;

The input end of the synchronous rectification BUCK circuit is connected to the current output end of the secondary coil, and the output end of the synchronous rectification BUCK circuit is connected to the battery charging stand.

The AC/DC module of the micro-charger rectifies the mains power and outputs direct current; and then steps down the voltage through the transformer, and the current after the step-down is output to the battery in the battery charging stand through the synchronous rectification BUCK circuit.

Further, the flyback switching power supply circuit further includes a first photocoupler and a logic controller; the flyback switching power supply controller receives control signals from the controller through the logic controller and the first photocoupler in sequence.

Further, a switch tube and a first current sampling circuit are arranged between the primary coil of the transformer and the flyback switching power supply controller, and the current output terminal of the secondary coil of the transformer passes through the rectifier circuit, the first voltage The sampling circuit and the second photocoupler are connected to the flyback switching power supply controller; the current output terminal of the primary coil is connected to the D pole of the switching tube, and the G pole of the switching tube is connected to the flyback switching power supply controller. The input end of the current sampling circuit is connected to the S pole of the switch tube, and the output end of the first current sampling circuit is connected to the current feedback end of the flyback switching power supply controller;

The first current sampling circuit collects the current of the primary side coil of the transformer, and feeds back the current signal to the flyback switching power supply controller;

The first voltage sampling circuit collects the rectified voltage of the secondary side coil of the transformer, then electrically isolates the voltage signal through the second photocoupler and generates a voltage induction signal, and transmits the voltage induction signal to the flyback switching power supply controller;

The flyback switching power supply controller sends a PWM driving signal to the G pole of the switching tube according to the received current signal and voltage sensing signal, so as to realize the on-off of the feedback switching power supply circuit.

Still further, the two ends of the primary coil of the transformer are respectively connected to the first absorbing circuit; the D pole and the S pole of the switch tube are respectively connected to the second absorbing circuit; the first absorbing circuit is used to absorb the leakage inductance of the primary coil of the transformer the energy; the second absorbing circuit is used to absorb the energy of the voltage spike generated at the moment when the switching tube is turned off.

Further, the synchronous rectification BUCK circuit includes a rectification module, a synchronous rectification controller, a unidirectional circuit, a second voltage sampling circuit, a filter circuit, a second current sampling circuit and a comparator;

The input end of the rectification module is connected to the current output end of the secondary coil of the transformer; the rectification module is connected to the current input end of the battery charging stand through a filter circuit and a one-way circuit in turn;

The input terminal of the second voltage sampling circuit is connected with the output terminal of the filter circuit, and the output terminal of the second voltage sampling circuit is connected with an input terminal of the comparator;

The input terminal of the second current sampling circuit is connected with the current output terminal of the battery charging stand, and the output terminal of the second current sampling circuit is connected with the other input terminal of the comparator;

The output end of the comparator is connected with the input end of the synchronous rectification controller; the output end of the synchronous rectifier is connected with the rectification module.

The beneficial effects of the utility model are as follows: when the battery pack is charged, the utility model can charge the battery in different modes, and the charging effect is good; secondly, it can also carry out balanced charging for different capacities of the battery, prolonging the service life of the battery.

Description of drawings

Fig. 1 is a working schematic diagram of the sub-module of the present invention.

Fig. 2 is a schematic diagram of the composition of the micro-charger of the present invention.

For ease of understanding, batteries are used to replace the battery charging stand in the accompanying drawings.

Detailed ways

The utility model will be further described below in conjunction with accompanying drawings 1 to 2 and specific embodiments.

Embodiment: See Fig. 1 to Fig. 2.

As shown in Figure 1, a power battery charging system includes a controller, a voltage detection unit, a micro-charger and a battery charging stand, the controller is connected to the control terminal of the micro-charger, and the power supply of the micro-charger and the battery charging stand The detection terminal of the voltage detection unit is connected to the power supply terminal, and the output terminal of the voltage detection unit is connected to the controller.

The utility model detects the voltage at both ends of the rechargeable battery through the voltage detection unit, and feeds back the voltage signal to the controller, and the controller controls the charging mode of the micro-charging motor according to the voltage signal, thereby achieving a good charging mode and prolonging the service life of the battery. The voltage detection unit may adopt a voltage acquisition circuit.

The controller here can use a switch circuit to send different current signals to the micro charger according to different voltage signals. The micro-charger charges the rechargeable battery with constant current or constant voltage according to the current signal.

Further, the charging system includes a plurality of micro chargers and a plurality of battery charging stands, and the micro chargers correspond to the battery charging stands one by one.

When the power battery is in use, a plurality of power batteries are generally connected in series, so when charging the battery pack, each power battery needs to be charged. Therefore design a plurality of micro-chargers and battery charging stands. Secondly, when the power battery pack is used in a motor vehicle, since the power battery may have different models, it needs to be charged separately, avoiding series charging will cause some power batteries to supply external power, which will affect the life of the power battery.

Furthermore, the charging system also includes a voltage detection unit, the detection terminals of the voltage detection unit are respectively connected to each battery charging stand, and the output terminals of the voltage detection unit are connected to the controller,

Due to the different types of power batteries, the power storage of the power batteries may vary. When charging different types of power batteries, their balance needs to be considered. At this time, the controller is equipped with a chip, which is used to analyze the charging mode control for charging the power battery; to make the power of each power battery in the battery pack in a balanced state, and to avoid some power batteries not supplying power to the outside during the use of the power battery. , In charging state. In the specific operation, the voltage of each rechargeable battery is detected by the voltage detection unit, and then the charging status of each rechargeable battery is monitored. The charging status is fed back to the controller through the current signal, and the controller controls the charging mode of the micro charger. . The voltage detection unit may employ a voltage detection circuit.

Further, the charging system further includes a thermal control system, the thermal control system includes a fan and a temperature sensor, the temperature sensor is set on the battery charging stand, the output terminal of the temperature sensor is connected to the controller, and the controller is connected to the control terminal of the fan.

Set up a thermal control system to control the temperature of the battery during charging. The battery will generate heat during charging, which will lead to changes in the resistance of the battery and changes in internal substances; thus affecting the charging effect; therefore, it is necessary to control the heating temperature of the battery.

Further, as shown in FIG. 2 , the micro-charger includes an AC/DC module, a flyback switching power supply circuit and a synchronous rectification BUCK circuit connected in sequence.

Further, the input end of the AC/DC module is connected to the mains, and the output end of the AC/DC module outputs a rectangular square wave current;

The flyback switching power supply circuit includes a transformer, and the transformer includes a primary coil and a secondary coil; the current input terminal of the primary coil is connected to the output terminal of the AC/DC module, and also includes a flyback switching power supply controller, a flyback The switching power supply controller receives the control signal sent by the controller and controls the switching power supply on and off;

The input end of the synchronous rectification BUCK circuit is connected to the current output end of the secondary coil, and the output end of the synchronous rectification BUCK circuit is connected to the battery charging stand. The current output terminal of the secondary coil is grounded. A capacitor is connected between the two ends of the secondary coil.

The AC/DC module of the micro-charger rectifies the mains power and outputs direct current; and then steps down the voltage through the transformer, and the current after the step-down is output to the battery in the battery charging stand through the synchronous rectification BUCK circuit.

Further, the flyback switching power supply circuit further includes a first photocoupler and a logic controller; the flyback switching power supply controller receives control signals from the controller through the logic controller and the first photocoupler in sequence.

The control signal of the controller is isolated through the photocoupler, and the signal of working or stopping is sent to the flyback switching power supply controller through the judgment of the logic controller. Furthermore, the flyback switching power supply controller can control the on-off of the transformer current, so as to realize the control to start or stop the work of the micro-pulling motor.

Further, a switch tube and a first current sampling circuit are arranged between the primary coil of the transformer and the flyback switching power supply controller, and the current output terminal of the secondary coil of the transformer passes through the rectifier circuit, the first voltage The sampling circuit and the second photocoupler are connected to the flyback switching power supply controller; the current output terminal of the primary coil is connected to the D pole of the switching tube, and the G pole of the switching tube is connected to the flyback switching power supply controller. The input end of the current sampling circuit is connected to the S pole of the switch tube, and the output end of the first current sampling circuit is connected to the current feedback end of the flyback switching power supply controller; the rectification circuit here includes a diode and a capacitor, and the diode and the secondary of the transformer The current output terminal of the side coil is connected, and the two ends of the capacitor are respectively connected to the two ends of the secondary coil of the transformer.

The first current sampling circuit collects the current of the primary coil of the transformer, and feeds back the current signal to the flyback switching power supply controller; the first current sampling circuit uses a sampling resistor to collect the current.

The first voltage sampling circuit collects the rectified voltage of the secondary side coil of the transformer, then electrically isolates the voltage signal through the second photocoupler and generates a voltage induction signal, and transmits the voltage induction signal to the flyback switching power supply controller;

The flyback switching power supply controller sends a PWM driving signal to the G pole of the switching tube according to the received current signal and voltage sensing signal, so as to realize the on-off of the feedback switching power supply circuit.

Still further, the two ends of the primary coil of the transformer are respectively connected to the first absorbing circuit; the D pole and the S pole of the switch tube are respectively connected to the second absorbing circuit; the first absorbing circuit is used to absorb the leakage inductance of the primary coil of the transformer the energy; the second absorbing circuit is used to absorb the energy of the voltage spike generated at the moment when the switching tube is turned off.

Further, the synchronous rectification BUCK circuit includes a rectification module, a synchronous rectification controller, a unidirectional circuit, a second voltage sampling circuit, a filter circuit, a second current sampling circuit and a comparator;

The input end of the rectification module is connected to the current output end of the secondary coil of the transformer; the rectification module is connected to the current input end of the battery charging stand through a filter circuit and a one-way circuit in turn;

The input terminal of the second voltage sampling circuit is connected with the output terminal of the filter circuit, and the output terminal of the second voltage sampling circuit is connected with an input terminal of the comparator;

The input terminal of the second current sampling circuit is connected with the current output terminal of the battery charging stand, and the output terminal of the second current sampling circuit is connected with the other input terminal of the comparator;

The output end of the comparator is connected with the input end of the synchronous rectification controller; the output end of the synchronous rectifier is connected with the rectification module.

Among them, the rectifier module adopts the form of multiple sets of field effect transistors connected in parallel to improve the overcurrent capability; the unidirectional circuit can use diodes so that the battery will not supply power to the outside without charging and consume its own power. The current sampling circuit includes a sampling resistor through which the current signal is converted into a voltage signal, the signal is compared with the voltage feedback signal, and the comparison result is input to the feedback pin of the switching power supply control chip.

The above are only preferred embodiments of the present application, and equivalent technical solutions on this basis still fall within the protection scope of the application.

Claims (10)

1. the charging system of an electrokinetic cell, it is characterized in that: comprise controller, voltage detection unit, micro-charger and cell-charging seat, controller is connected with the control end of micro-charger, micro-charger is connected with the power end of cell-charging seat, the test side of voltage detection unit is connected with described power end, and the output of voltage detection unit is connected with controller.

2. the charging system of a kind of electrokinetic cell according to claim 1, is characterized in that: described charging system comprises a plurality of micro-chargers and a plurality of cell-charging seat, and micro-charger is corresponding one by one with cell-charging seat.

3. the charging system of a kind of electrokinetic cell according to claim 2, it is characterized in that: described charging system also comprises voltage detection unit, the test side of voltage detection unit is connected with each cell-charging seat respectively, and the output of voltage detection unit is connected with controller.

4. the charging system of a kind of electrokinetic cell according to claim 3, it is characterized in that: described charging system also comprises heat control system, heat control system comprises fan and temperature sensor, temperature sensor is arranged at cell-charging seat, the output of temperature sensor is connected with controller, and controller is connected with the control end of fan.

5. the charging system of a kind of electrokinetic cell according to claim 4, is characterized in that: micro-charger comprises AC/DC module, inverse-excitation type switch power-supply circuit and the synchronous rectification BUCK circuit connecting successively;

AC/DC module is electrically connected to city, and civil power is transferred to the direct current of low pressure; And direct current is transferred to inverse-excitation type switch power-supply circuit;

Inverse-excitation type switch power-supply circuit carries out step-down processing to the electric current of AC/DC module output; By the current delivery after step-down to synchronous rectification BUCK circuit;

The electric current of synchronous rectification BUCK circuit after to step-down carries out rectification processing, to battery output constant current or constant voltage electricity.

6. the charging system of a kind of electrokinetic cell according to claim 5, is characterized in that: described inverse-excitation type switch power-supply circuit comprises transformer, and transformer comprises primary coil and secondary coil; The current input terminal of primary coil is connected with the output of AC/DC module, also comprises inverse-excitation type switch power-supply controller, and inverse-excitation type switch power-supply controller receives the control signal that controller sends, and controls the break-make of inverse-excitation type switch power-supply circuit;

The input of synchronous rectification BUCK circuit is connected with the current output terminal of secondary coil, and the output of synchronous rectification BUCK circuit is connected with cell-charging seat.

7. the charging system of a kind of electrokinetic cell according to claim 6, is characterized in that: inverse-excitation type switch power-supply circuit also comprises the first photoelectrical coupler and logic controller; Inverse-excitation type switch power-supply controller receives the control signal of self-controller successively by logic controller, the first photoelectrical coupler.

8. the charging system of a kind of electrokinetic cell according to claim 7, it is characterized in that: between the primary coil of described transformer and inverse-excitation type switch power-supply controller, be provided with switching tube, the first current sampling circuit, the current output terminal of the secondary coil of described transformer is connected with inverse-excitation type switch power-supply controller by rectification circuit, the first voltage sampling circuit, the second photoelectrical coupler successively; The current output terminal of primary coil is connected with the D utmost point of switching tube, the G utmost point of switching tube is connected with inverse-excitation type switch power-supply controller, the input of the first current sampling circuit is connected with the S utmost point of switching tube, and the output of the first current sampling circuit is connected with the current feedback terminal of inverse-excitation type switch power-supply controller;

The first current sampling circuit gathers the electric current of transformer primary side coil, and this current signal is fed back to inverse-excitation type switch power-supply controller;

The first voltage sampling circuit gathers the voltage after the rectification of transformer secondary coil, just by this voltage signal through the second photoelectrical coupler electrical isolation formation voltage induced signal, voltage induced signal passes to inverse-excitation type switch power-supply controller;

Inverse-excitation type switch power-supply controller sends PWM according to the current signal receiving, voltage induced signal to the G utmost point of switching tube and drives signal, realizes the steady operation of reaction type switching power circuit.

9. a micro-charger, is characterized in that: comprise the AC/DC module, inverse-excitation type switch power-supply circuit and the synchronous rectification BUCK circuit that connect successively;

AC/DC module is electrically connected to city, and civil power is transferred to the direct current of low pressure; And direct current is transferred to inverse-excitation type switch power-supply circuit;

Inverse-excitation type switch power-supply circuit carries out step-down processing to the electric current of AC/DC module output; By the current delivery after step-down to synchronous rectification BUCK circuit;

The electric current of synchronous rectification BUCK circuit after to step-down carries out rectification processing, to battery output constant current or constant voltage electricity.

10. a kind of micro-charger according to claim 9, is characterized in that: described inverse-excitation type switch power-supply circuit comprises transformer, and transformer comprises primary coil and secondary coil; The current input terminal of primary coil is connected with the output of AC/DC module, also comprises inverse-excitation type switch power-supply controller, and inverse-excitation type switch power-supply controller receives the control signal that controller sends, and controls the break-make of inverse-excitation type switch power-supply circuit;

The input of synchronous rectification BUCK circuit is connected with the current output terminal of secondary coil, and the output of synchronous rectification BUCK circuit is connected with cell-charging seat; Inverse-excitation type switch power-supply circuit also comprises the first photoelectrical coupler and logic controller; Inverse-excitation type switch power-supply controller receives the control signal of self-controller successively by logic controller, the first photoelectrical coupler.