Battery equalization method and system, vehicle, storage medium, and electronic device

Abstract

The present application discloses a battery equalization system, a vehicle, a battery equalization method, and a storage medium. The battery equalization system includes: a collection circuit; an equalization circuit; a controller, connected to the collection circuit and the equalization circuit; and a power supply branch circuit, controlled by the controller to get connected to a power supply unit and the battery equalization system when a vehicle is in an OFF gear and a cell needs enabling of equalization, so that the power supply unit supplies power to the battery equalization system.

What is claimed is: 
     
         1 . A battery equalization system, comprising:
 a collection circuit, configured to collect parameter information of cells in a battery pack;   an equalization circuit, configured to perform equalization processing on the cells in the battery pack;   a controller, connected to the collection circuit and the equalization circuit separately, and configured to determine, according to the parameter information of the cells in the battery pack, whether there is a cell in the battery pack needs enabling of equalization, and to control, when it is determined that a cell in the battery pack needs enabling of equalization, the equalization circuit to perform equalization processing on the cell that needs enabling of equalization;   a power supply branch circuit, controlled by the controller to get connected to a power supply unit and the battery equalization system when a vehicle is in an OFF gear and a cell needs enabling of equalization, so that the power supply unit supplies power to the battery equalization system.   
     
     
         2 . The battery equalization system according to  claim 1 , wherein the power supply branch circuit comprises a first power supply branch circuit and a second power supply branch circuit;
 the first power supply branch circuit is connected to the power supply unit and the battery equalization system, and the first power supply branch circuit is configured to supply power to the battery equalization system and loads of the entire vehicle except the battery equalization system;   the second power supply branch circuit is connected to the power supply unit and the battery equalization system, and the second power supply branch circuit is configured to supply power to the battery equalization system; and   when the vehicle is in the OFF gear and a cell needs enabling of equalization, the second power supply branch circuit is in a connected state, and the first power supply branch circuit is in a disconnected state under the control of a vehicle body controller.   
     
     
         3 . The battery equalization system according to  claim 2 , wherein connection and disconnection of the first power supply branch circuit and the second power supply branch circuit are controlled by a switch. 
     
     
         4 . The battery equalization system according to  claim 2 , wherein a second switch and a first switch that is controlled by the vehicle body controller are separately disposed on the second power supply branch circuit and the first power supply branch circuit; two sides of the second switch are respectively connected to the power supply unit and the controller; one side of the first switch is connected to the power supply unit, and the other side of the first switch is connected to the controller and a load. 
     
     
         5 . The battery equalization system according to  claim 4 , wherein the second switch is controlled by the vehicle body controller; when the vehicle is in the OFF gear and a cell needs enabling of equalization, the controller transmits an equalization request to the vehicle body controller so that the vehicle body controller controls the second switch and the first switch to stay in a connected state and a disconnected state respectively. 
     
     
         6 . The battery equalization system according to  claim 5 , wherein when the vehicle is in the OFF gear and after the equalization circuit ends the equalization processing on the cell that needs enabling of equalization, the controller transmits an equalization end request to the vehicle body controller so that the vehicle body controller controls the second switch to stay in a disconnected state. 
     
     
         7 . The battery equalization system according to  claim 4 , wherein the second switch is controlled by the controller; when the vehicle is in the OFF gear and a cell needs enabling of equalization, the controller controls the second switch to get connected, and after the second power supply branch circuit is connected, the vehicle body controller controls the first switch to disconnect. 
     
     
         8 . The battery equalization system according to  claim 7 , wherein when the vehicle is in the OFF gear and after the equalization circuit ends the equalization processing on the cell that needs enabling of equalization, the controller controls the second switch to stay in a disconnected state. 
     
     
         9 . The battery equalization system according to  claim 4 , wherein after the vehicle is powered on, the second switch is in a connected state under the control of the controller or the vehicle body controller. 
     
     
         10 . The battery equalization system according to  claim 2 , further comprising a third power supply branch circuit, one end of the third power supply branch circuit is connected to the controller, and the other end of the third power supply branch circuit is connected to the collection circuit and the equalization circuit. 
     
     
         11 . The battery equalization system according to  claim 1 , wherein the controller is respectively connected through two channels to the collection circuit and the equalization circuit that correspond to a same cell. 
     
     
         12 . The battery equalization system according to  claim 11 , wherein the controller comprises a control chip, and the control chip is respectively connected through two pins to the collection circuit and the equalization circuit that correspond to the same cell, the two pins are in one-to-one correspondence to the two channels, one of the two pins is connected to the equalization circuit through one of the two channels, and the other of the two pins is connected to the collection circuit through the other of the two channels. 
     
     
         13 . The battery equalization system according to  claim 1 , wherein the controller is connected through one channel to the collection circuit and the equalization circuit that correspond to a same cell, and the collection circuit and the equalization circuit multiplex the channel in a time division manner. 
     
     
         14 . The battery equalization system according to  claim 13 , wherein the controller comprises a control chip, the control chip is connected through one pin to the collection circuit and the equalization circuit that correspond to the same cell, and the pin is connected to the equalization circuit and the collection circuit through the channel. 
     
     
         15 . The battery equalization system according to  claim 1 , wherein the controller is further configured to: when it is determined, according to the parameter information of the battery pack, that a cell in the battery pack needs enabling of equalization, obtain a target equalization duration of the cell that needs enabling of equalization, and control, according to the target equalization duration of the cell that needs enabling of equalization, the equalization circuit to discharge the cell that needs enabling of equalization. 
     
     
         16 . A vehicle, comprising a battery equalization system according to  claim 1 . 
     
     
         17 . A battery equalization method, applied to a vehicle that comprises the battery equalization system according to  claim 1 , wherein the battery equalization method comprises:
 collecting, by a collection circuit, parameter information of cells in a battery pack;   controlling, when it is determined, according to the parameter information of the cells in the battery pack, that a cell in the battery pack needs enabling of equalization and that the vehicle is in an OFF gear, a power supply branch circuit to get connected to a power supply unit and the battery equalization system, so that the power supply unit supplies power to the battery equalization system; and   controlling, by a controller, an equalization circuit to perform equalization processing on the cell that needs enabling of equalization.   
     
     
         18 . The method according to  claim 17 , wherein the battery equalization system further comprises a first power supply branch circuit connected to the power supply unit and the battery equalization system, and a second power supply branch circuit connected to the power supply unit and the battery equalization system;
 the controlling a power supply branch circuit to get connected to a power supply unit and the battery equalization system comprises:   controlling the second power supply branch circuit to stay in a connected state; and   changing, by a vehicle body controller after the second power supply branch circuit is connected, the first power supply branch circuit from a connected state to a disconnected state.   
     
     
         19 . The method according to  claim 18 , wherein the controlling the second power supply branch circuit to stay in a connected state comprises:
 transmitting, by the controller, an equalization request to the vehicle body controller; and   controlling, by the vehicle body controller after receiving the equalization request, the second power supply branch circuit to stay in a connected state.   
     
     
         20 . The method according to  claim 19 , further comprising:
 confirming, by the controller, that the equalization circuit ends the equalization processing on the cell that needs enabling of equalization;   transmitting, by the controller, an equalization end request to the vehicle body controller; and   controlling, by the vehicle body controller after receiving the equalization end request, the second power supply branch circuit to stay in a disconnected state.