Lithium battery charging and discharging conversion control system

Abstract

The utility model discloses a lithium battery charging and discharging conversion control system, comprising a lithium battery module comprising a flyback switching power supply, a charging control circuit, a rechargeable lithium battery and a discharging control circuit; the control module comprises a man-machine interaction module, a driving unit, a battery management unit and a current detection and comparison unit; through the lithium battery module, changes of voltage and current in the working process of the lithium battery can be analyzed, and the working process of the lithium battery is reasonably controlled, so that the cycle service life of the lithium battery is ensured and prolonged; the driving unit controls the opening and closing of the lithium battery module so as to ensure the normal work and safety of the lithium battery charging and discharging conversion control system. The current detection and comparison unit detects the current flowing through the lithium battery module in real time and awakens / dormants the battery management unit based on the current flowing through the lithium battery module, so that energy damage of the system is reduced, system safety is guaranteed, the same effect as that of a lead-acid battery can be achieved, and application of the lithium battery to a vehicle-mounted power supply is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy technology field, concretely is a lithium battery charge -discharge conversion control system. BACKGROUND

[0002] With the development of lithium battery market, the application of vehicle lithium battery is also more and more widely, and the traditional vehicle power supply adopts lead-acid battery, but with the rapid development of lithium technology, the vehicle battery lithium becomes the development trend. However, the existing lithium battery cannot analyze the change of voltage and current in the working process of lithium battery in charge-discharge conversion, cannot reasonably control the working process of lithium battery, and cannot guarantee the normal work and safety of lithium battery charge-discharge conversion control system, therefore, we propose a lithium battery charge-discharge conversion control system to solve the above-mentioned problems. UTILITY MODEL CONTENT

[0003] To achieve the above object, the utility model provides the following technical scheme:

[0004] A lithium battery charge-discharge conversion control system, comprising:

[0005] A lithium battery module comprising a flyback switching power supply, a charging control circuit, a rechargeable lithium battery and a discharge control circuit, the output end of the flyback switching power supply is connected to the input end of the charging control circuit, the output end of the charging control circuit is connected to the input end of the rechargeable lithium battery, and the output end of the rechargeable lithium battery is connected to the input end of the discharge control circuit;

[0006] A control module comprising a man-machine interaction module, a driving unit, a battery management unit and a current detection comparison unit, the man-machine interaction module, the battery management unit and the current detection comparison unit are connected to the driving unit respectively;

[0007] The flyback switching power supply comprises a filter module, a high-frequency transformer and a loop compensation module, the output end of the filter module is connected to the input end of the high-frequency transformer, and the output end of the high-frequency transformer is connected to the input end of the loop compensation module; the charging control circuit comprises a signal control end, a charging power supply end, a device power supply end, a battery end, a triode, a first MOS tube and a second MOS tube; wherein the charging power supply end is connected to the ground through the series connection of a first resistor and a second resistor; the base of the triode is connected to the signal control end and the charging power supply end respectively, the collector of the triode is connected to the gate of the second MOS tube through a fourth resistor and also connected to the source of the first MOS tube through a third resistor, and the emitter of the triode is connected to the ground; the source of the second MOS tube is connected to the charging power supply end through a first diode, and the drain is connected to the device power supply end; the source of the first MOS tube is connected to the charging power supply end through a first diode, the gate is connected to the connection point of the first resistor and the second resistor, and the drain is connected to the battery end;

[0008] The drive unit includes a control unit and a third resistor, which is connected between the lithium battery module and the control unit. It also includes a fourth resistor, one end of which is grounded and the other end is connected to the control unit.

[0009] The current detection and comparison unit includes a differential operational amplifier module connected to the lithium battery module for processing the current flowing through the lithium battery module; and a digital comparator connected to both the differential operational amplifier module and the lithium battery module for waking up / sleeping the battery management unit based on the current flowing through the lithium battery module.

[0010] The charge / discharge conversion control system further includes a pre-charge resistor, a pre-charge relay, and a discharge relay. The input terminal of the pre-charge relay is connected to the input terminal of the discharge relay, the output terminal of the pre-charge relay is connected to the input terminal of the pre-charge resistor, and the output terminal of the pre-charge resistor is connected to the output terminal of the discharge relay.

[0011] As a further embodiment of this invention, the driving unit further includes a fifth resistor, one end of which is grounded and the other end is connected to the control unit.

[0012] As a further aspect of this invention, the control unit uses a Corte-M3 core STM32 controller as the main control chip.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] This lithium battery charge / discharge conversion control system analyzes voltage and current changes during lithium battery operation via the lithium battery module, rationally controlling the battery's operation to ensure and improve its cycle life. The drive unit controls the opening and closing of the lithium battery module to ensure the normal operation and safety of the charge / discharge conversion control system. A current detection and comparison unit monitors the current flowing through the lithium battery module in real time and uses this current to wake up / put the battery management unit into sleep mode, reducing energy loss and ensuring system safety. This design can wake up the battery management unit without external signals, achieving the same effect as lead-acid batteries, thus facilitating the application of lithium batteries in vehicle power supplies. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the lithium battery charge-discharge conversion control system in this utility model. Detailed Implementation

[0016] In one embodiment, such as Figure 1 As shown, a lithium battery charge / discharge conversion control system includes:

[0017] The lithium battery module comprises a flyback switching power supply, a charging control circuit, a rechargeable lithium battery, and a discharging control circuit, wherein the output end of the flyback switching power supply is connected to the input end of the charging control circuit, the output end of the charging control circuit is connected to the input end of the rechargeable lithium battery, and the output end of the rechargeable lithium battery is connected to the input end of the discharging control circuit.

[0018] The control module comprises a human-computer interaction module, a driving unit, a battery management unit, and a current detection and comparison unit, wherein the human-computer interaction module, the battery management unit, and the current detection and comparison unit are connected to the driving unit; the driving unit controls the opening and closing of the lithium battery module to ensure the normal operation and safety of the lithium battery charging and discharging conversion control system. The current detection and comparison unit detects the current flowing through the lithium battery module in real time, and wakes up / sleeps the battery management unit based on the current flowing through the lithium battery module to reduce the energy damage of the system and ensure the safety of the system. This design does not need to use external signals to wake up the battery management unit, and can achieve the same effect as lead-acid batteries, facilitating the application of lithium batteries in vehicle power supplies.

[0019] The charging control circuit comprises a signal control end, a charging power supply end, a device power supply end, a battery end, a triode, a first MOS tube, and a second MOS tube; wherein the charging power supply end is connected to the ground through a first resistor and a second resistor in series; the base of the triode is connected to the signal control end and the charging power supply end, the collector of the triode is connected to the gate of the second MOS tube through a fourth resistor, and is also connected to the source of the first MOS tube through a third resistor, and the emitter of the triode is connected to the ground; the source of the second MOS tube is connected to the charging power supply end through a first diode, and the drain is connected to the device power supply end; the source of the first MOS tube is connected to the charging power supply end through a first diode, the gate is connected to the connection point of the first resistor and the second resistor, and the drain is connected to the battery end.

[0020] The flyback switching power supply comprises a filter module, a high-frequency transformer and a loop compensation module, the output end of the filter module is connected with the input end of the high-frequency transformer, and the output end of the high-frequency transformer is connected with the input end of the loop compensation module; the filter module comprises a common-mode inductor, an X capacitor, a Y capacitor and a discharge resistor; the common-mode inductor is composed of two same-direction winding coils and is used for eliminating loop differential current; the X capacitor is connected in parallel at both sides of the common-mode inductor and is used for eliminating differential-mode interference; the Y capacitor is connected in series at the output end and is connected to ground at the midpoint and is used for suppressing common-mode interference; the discharge resistor is used for eliminating static accumulation in the filter; the design of the high-frequency transformer is the most important part in the design of the switching power supply, and the performance of the transformer directly affects the working stability and use performance of the switching power supply; through analyzing the voltage and current changes in the working process of the lithium battery, the working process of the lithium battery is reasonably controlled, so that the cycle service life of the lithium battery is ensured and improved.

[0021] The driving unit comprises a control unit and a third resistor connected between the lithium battery module and the control unit, and further comprises a fourth resistor, one end of which is grounded and the other end of which is connected with the control unit; the driving unit further comprises a fifth resistor, one end of which is grounded and the other end of which is connected with the control unit; the current detection and comparison unit comprises a differential operational amplifier module connected with the lithium battery module and used for processing the current flowing through the lithium battery module; a digital comparator connected with the differential operational amplifier module and the lithium battery module respectively and used for waking up / sleeping the battery management unit based on the current flowing through the lithium battery module; the differential operational amplifier module is connected at both ends of the lithium battery module to process the current flowing through the lithium battery module; the input end of the digital comparator is connected with the output end of the differential operational amplifier module, and the output end of the digital comparator is connected with the battery management unit to wake up / sleep the battery management unit based on the current flowing through the lithium battery module. That is, the current flowing through the lithium battery module is compared with a current threshold value, if the current flowing through the lithium battery module is greater than or equal to the current threshold value, a signal is output to the battery management unit to wake up the battery management unit; if the current flowing through the lithium battery module is less than the current threshold value, the battery management unit is slept.

[0022] The control unit adopts a Corte-M3 kernel STM32 controller as a main control chip.

[0023] The charge-discharge conversion control system further comprises a pre-charging resistor, a pre-charging relay and a discharging relay, the input end of the pre-charging relay is connected to the input end of the discharging relay, the output end of the pre-charging relay is connected to the input end of the pre-charging resistor, and the output end of the pre-charging resistor is connected to the output end of the discharging relay.

[0024] The above merely describes a preferred embodiment of the present application, and the protection scope of the present application is not limited thereto, and any skilled person in the art, according to the technical scheme and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A lithium battery charge / discharge conversion control system, characterized in that, include: A lithium battery module includes a flyback switching power supply, a charging control circuit, a rechargeable lithium battery, and a discharging control circuit. The output terminal of the flyback switching power supply is connected to the input terminal of the charging control circuit, the output terminal of the charging control circuit is connected to the input terminal of the rechargeable lithium battery, and the output terminal of the rechargeable lithium battery is connected to the input terminal of the discharging control circuit. The control module includes a human-machine interaction module, a drive unit, a battery management unit, and a current detection and comparison unit, wherein the human-machine interaction module, the battery management unit, and the current detection and comparison unit are respectively connected to the drive unit; The flyback switching power supply includes a filter module, a high-frequency transformer, and a loop compensation module. The output of the filter module is connected to the input of the high-frequency transformer, and the output of the high-frequency transformer is connected to the input of the loop compensation module. The charging control circuit includes a signal control terminal, a charging power supply terminal, a device power supply terminal, a battery terminal, a transistor, a first MOSFET, and a second MOSFET. The charging power supply terminal is grounded through a first resistor and a second resistor connected in series. The base of the transistor is connected to both the signal control terminal and the charging power supply terminal. The collector of the transistor is connected to the gate of the second MOSFET through a fourth resistor and to the source of the first MOSFET through a third resistor. The emitter of the transistor is grounded. The source of the second MOSFET is connected to the charging power supply terminal through a first diode, and its drain is connected to the device power supply terminal. The source of the first MOSFET is connected to the charging power supply terminal through a first diode, its gate is connected to the junction of the first and second resistors, and its drain is connected to the battery terminal. The drive unit includes a control unit and a third resistor, which is connected between the lithium battery module and the control unit. It also includes a fourth resistor, one end of which is grounded and the other end is connected to the control unit. The current detection and comparison unit includes a differential operational amplifier module connected to the lithium battery module for processing the current flowing through the lithium battery module; and a digital comparator connected to both the differential operational amplifier module and the lithium battery module for waking up / sleeping the battery management unit based on the current flowing through the lithium battery module. The charge / discharge conversion control system further includes a pre-charge resistor, a pre-charge relay, and a discharge relay. The input terminal of the pre-charge relay is connected to the input terminal of the discharge relay, the output terminal of the pre-charge relay is connected to the input terminal of the pre-charge resistor, and the output terminal of the pre-charge resistor is connected to the output terminal of the discharge relay.

2. The lithium battery charge / discharge conversion control system according to claim 1, characterized in that, The drive unit also includes a fifth resistor, one end of which is grounded and the other end is connected to the control unit.

3. The lithium battery charge / discharge conversion control system according to claim 1, characterized in that, The control unit uses a Corte-M3 core STM32 controller as the main control chip.

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