CN-121984198-A - Power supply circuit and electric vehicle

CN121984198ACN 121984198 ACN121984198 ACN 121984198ACN-121984198-A

Abstract

The embodiment of the invention provides a power supply circuit and an electric vehicle. The power supply circuit comprises at least two batteries, a bidirectional voltage transformation module and a power supply module, wherein the at least two batteries are connected in parallel, the bidirectional voltage transformation module is connected between the batteries and a load and between the batteries and a charging interface, and is used for reducing the voltage of the charging interface in a charging mode, then charging the batteries, and boosting the output voltage of the batteries in a power supply mode and then supplying power to the load. According to the technical scheme provided by the embodiment, through the batteries connected in parallel, the problem that the service life of the whole battery is shortened due to the fact that the capacities of the single batteries are inconsistent in the series batteries is avoided, the milder and more balanced charge and discharge management of the batteries is achieved, and the service life of the batteries is prolonged.

Inventors

ZHANG FANGYONG
WU JUNCHAO
MA WEIDONG
ZHANG LINGCHAO
GAO YANG

Assignees

浙江绿源电动车有限公司

Dates

Publication Date: 20260505
Application Date: 20260130

Claims (10)

1. A power supply circuit, comprising: at least two batteries connected in parallel; The bidirectional voltage transformation module is connected between the battery and the load and between the battery and the charging interface, and is used for charging the battery after the voltage of the charging interface is reduced in a charging mode and supplying power to the load after the output voltage of the battery is increased in a power supply mode.
2. The power supply circuit of claim 1, wherein the bidirectional voltage transformation module comprises: the first end of the DCDC module is connected with the at least two batteries, the second end of the DCDC module is connected with the load, and the third end of the DCDC module is connected with the charging interface; the DCDC module is used for boosting the first voltage of the battery to the second voltage in a power supply mode, and reducing the second voltage of the charging interface to the first voltage in a charging mode; the rated voltage of each battery is the first voltage, the rated voltage of the load is the second voltage, and the rated voltage of the charging interface is the second voltage.
3. The power supply circuit of claim 2, wherein the load comprises: And the motor controller is connected with the DCDC module and is used for controlling the power motor to rotate according to the second voltage output by the second end of the DCDC module.
4. A power supply circuit according to claim 3, wherein the load further comprises: the system comprises a DCDC module, a main controller, a power supply module and a power supply module, wherein the DCDC module is electrically connected with the power supply module; The current of the branch circuit where the main controller is located is smaller than the current of the branch circuit where the motor controller is located.
5. The power supply circuit of claim 4, wherein the load further comprises: The instrument is in communication connection with the DCDC module and the main controller and is used for displaying the working state of the DCDC module; The current of the branch circuit where the instrument is located is smaller than the current of the branch circuit where the motor controller is located.
6. The power supply circuit of claim 4 or 5, further comprising: And the electric door lock is electrically connected with the DCDC module and is used for starting the connection between the DCDC module and the motor controller of the load.
7. The power supply circuit of claim 6, wherein the power supply circuit further comprises: The switching device is connected between the DCDC module and the motor controller and is connected with the main controller; The main controller is connected with the electric door lock, and under the condition that the electric door lock is opened, the main controller is used for receiving an activation signal of the electric door lock, controlling the DCDC module to start according to the activation signal, enabling the DCDC module to work in a boosting mode and controlling the switching device to be conducted, and supplying power to the motor controller.
8. The power supply circuit of claim 7, wherein the power supply circuit further comprises: The system comprises a main controller, a first acquisition module, a load meter, a first control module and a second acquisition module, wherein the main controller is used for controlling the load meter to display the state information of the battery; And/or the second acquisition module is connected with the main controller, the second acquisition module is used for acquiring the voltage signal of the charging interface, the main controller is used for controlling the DCDC module to work in a voltage reduction mode according to the voltage signal of the charging interface, and the DCDC module is used for reducing the second voltage input by the charging interface to a first voltage so as to charge the batteries connected in parallel; in the charging mode, the main controller is further configured to control the switching device to be turned off.
9. The power supply circuit of claim 8, wherein, The main controller is also used for controlling the switching device to be disconnected and controlling the main power circuit of the DC/DC module to be dormant when the electric door lock is in a closed state; and/or the battery comprises a lead acid battery.
10. An electric vehicle comprising the power supply circuit according to any one of claims 1 to 9.

Description

Power supply circuit and electric vehicle Technical Field The embodiment of the invention relates to the technical field of circuits, in particular to a power supply circuit and an electric vehicle. Background In the existing vehicles such as electric two-wheelers, tricycles and the like, a scheme of connecting four 12V lead-acid storage batteries in series into a 48V battery pack is generally adopted, and the battery pack directly supplies power for a controller, a motor and other electric appliances of the vehicle. The scheme has high requirement on the consistency of the battery and serious service life damage. Due to the series structure of the cells, the overall performance of the battery pack is limited by the unit cells of which the performance is the worst. In the charge and discharge process, the tiny difference of the single batteries can cause uneven voltage of the battery pack, partial batteries are easy to overcharge or undercharge, vulcanization and aging of the partial batteries are accelerated, and therefore the service life of the whole battery pack is greatly shortened, and replacement cost of users and after-sale repair rate are increased. The existing power supply circuit is difficult to realize independent and accurate voltage control on each battery during charging, balanced charging cannot be performed, and the problem of overall service life shortening caused by inconsistency among batteries is further solved. Disclosure of Invention The embodiment of the invention provides a power supply circuit and an electric vehicle, which are used for solving the problems that the existing power supply circuit is difficult to realize independent and accurate voltage control on each battery during charging, and balanced charging cannot be performed, so that inconsistency among batteries is further deteriorated, and the whole service life is shortened. In order to realize the technical problems, the invention adopts the following technical scheme: The embodiment of the invention provides a power supply circuit, which comprises: at least two batteries connected in parallel; The bidirectional voltage transformation module is connected between the battery and the load and between the battery and the charging interface, and is used for charging the battery after the voltage of the charging interface is reduced in a charging mode and supplying power to the load after the output voltage of the battery is increased in a power supply mode. Optionally, the bidirectional transformation module includes: the first end of the DCDC module is connected with the at least two batteries, the second end of the DCDC module is connected with the load, and the third end of the DCDC module is connected with the charging interface; the DCDC module is used for boosting the first voltage of the battery to the second voltage in a power supply mode, and reducing the second voltage of the charging interface to the first voltage in a charging mode; the rated voltage of each battery is the first voltage, the rated voltage of the load is the second voltage, and the rated voltage of the charging interface is the second voltage. Optionally, the load includes: And the motor controller is connected with the DCDC module and is used for controlling the power motor to rotate according to the second voltage output by the second end of the DCDC module. Optionally, the load further includes: the system comprises a DCDC module, a main controller, a power supply module and a power supply module, wherein the DCDC module is electrically connected with the power supply module; The current of the branch circuit where the main controller is located is smaller than the current of the branch circuit where the motor controller is located. Optionally, the load further includes: The instrument is in communication connection with the DCDC module and the main controller and is used for displaying the working state of the DCDC module; The current of the branch circuit where the instrument is located is smaller than the current of the branch circuit where the motor controller is located. Optionally, the power supply circuit further includes: And the electric door lock is electrically connected with the DCDC module and is used for starting the connection between the DCDC module and the motor controller of the load. Optionally, the power supply circuit further includes: The switching device is connected between the DCDC module and the motor controller and is connected with the main controller; The main controller is connected with the electric door lock, and under the condition that the electric door lock is opened, the main controller is used for receiving an activation signal of the electric door lock, controlling the DCDC module to start according to the activation signal, enabling the DCDC module to work in a boosting mode and controlling the switching device to be conducted, and supplying power to the motor controller. Optionally, the power supply cir