Battery self-heating control system and control method, and electric transportation means

Inventors: Lei Yan (Shenzhen, CN); Wen Gao (Shenzhen, CN); Junwei Zhang (Shenzhen, CN); Gan Song (Shenzhen, CN)

Assignee: BYD COMPANY LIMITED

B60L58/27 H01M10/46 H01M10/615 H01M10/625 H01M10/637 H01M2220/20

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Quick Facts

Patent No.: US 12709194
App. No.: 19/055,269
Granted: Aug 18, 2026
Kind: B2

External Links

USPTO Patent Center↗ Full Patent PDF↗

Abstract

A battery self-heating control system includes a battery pack, a winding, a first switch assembly, a second switch assembly, a capacitor, and a controller. The battery pack includes a first battery group and a second battery group connected in series, a connection line led out between the first and the second battery groups, and connected to one end of the winding. The first switch assembly and the second switch assembly are connected in series, the first switch assembly is electrically connected to a positive electrode of the first battery group and a first end of the capacitor, the second switch assembly is electrically connected to a negative electrode of the second battery group and a second end of the capacitor, the first end and the second end of the capacitor connected to a load. The controller is electrically connected to the first switch assembly and the second switch assembly.

Claims (27)

1 . A battery self-heating control system, the control system comprising: a battery pack, a winding, a first switch assembly, a second switch assembly, a capacitor, and a controller;

the battery pack comprising a first battery group and a second battery group that are connected in series, a connection line being led out between the first battery group and the second battery group, and the connection line being connected to one end of the winding;

the first switch assembly and the second switch assembly being connected in series, the first switch assembly being electrically connected to a positive electrode of the first battery group and a first end of the capacitor, the second switch assembly being electrically connected to a negative electrode of the second battery group and a second end of the capacitor, the first end and the second end of the capacitor being used for connecting to a load, and the other end of the winding being connected between the first switch assembly and the second switch assembly; and

the controller being electrically connected to the first switch assembly and the second switch assembly, the controller being configured to control the first switch assembly and the second switch assembly to switch between an on state and an open state, and make the first battery group and the second battery group perform alternate charging and discharging through the winding, to heat the battery pack, and at least one of the first battery group, the second battery group, and the capacitor being configured to supply power to the load,

wherein in a case that the control system is in a first state, within a first half cycle of each control cycle of the controller, the controller is configured to control the first switch assembly and the second switch assembly to switch between the on state and the open state, and the first battery group to charge the winding and charge the second battery group through the winding, and the capacitor and/or the first battery group are/is configured to supply power to the load; and

within a second half cycle of each control cycle of the controller, the controller is configured to control the first switch assembly and the second switch assembly to switch between the on state and the open state, and the second battery group to charge the winding and charge the first battery group through the winding, and the capacitor and/or the second battery group are/is configured to supply power to the load.

2 . The battery self-heating control system according to claim 1 , wherein within a first time period of the first half cycle, the controller controls the first switch assembly to be in a closed state and the second switch assembly to be in the open state, the first battery group to charge the winding, and the capacitor to supply power to the load; and

within a second time period of the first half cycle, the controller controls the first switch assembly to be in the open state and the second switch assembly to be in the closed state, the winding to charge the second battery group, and the first battery group and the capacitor to supply power to the load.

3 . The battery self-heating control system according to claim 1 , wherein within a third time period of the second half cycle, the controller controls the first switch assembly to be in the open state, and controls the second switch assembly to be in the closed state, the second battery group to charge the winding, and the capacitor to supply power to the load; and

within a fourth time period of the second half cycle, the controller controls the first switch assembly to be in the closed state and the second switch assembly to be in the open state, the winding to charge the first battery group, and the second battery group and the capacitor to supply power to the load.

4 . A battery self-heating control system, the control system comprising: a battery pack, a winding, a first switch assembly, a second switch assembly, a capacitor, and a controller;

wherein in a case that the control system is in a second state, a battery level of the first battery group is greater than a battery level of the second battery group, and within a first time period of each control cycle, the controller controls the first switch assembly and the second switch assembly to switch between the on state and the open state, and controls the first switch assembly to be in the closed state and the second switch assembly to be in the open state, the first battery group to charge the winding, and the first battery group, the second battery group, and the capacitor to supply power to the load; and

within a second time period of each control cycle, the controller controls the first switch assembly to be in the open state and the second switch assembly to be in the closed state, the winding to charge the second battery group, and the first battery group and the second battery group to supply power to the capacitor and the load.

5 . The battery self-heating control system according to claim 4 , wherein in a case that the control system is in the second state, the battery level of the first battery group is greater than the battery level of the second battery group, and within a third time period of each control cycle, the controller controls the first switch assembly to be in the open state, and controls the second switch assembly to be in the closed state, the second battery group to charge the winding, and the first battery group, the second battery group, and the capacitor to supply power to the load; and

within a fourth time period of each control cycle, the controller controls the first switch assembly to be in the closed state and the second switch assembly to be in the open state, the winding to charge the first battery group, and the first battery group and the second battery group to supply power to the capacitor and the load.

6 . The battery self-heating control system according to claim 1 , wherein in a case that the second battery group is damaged, the controller controls the first switch assembly and the second switch assembly to be alternately in the on state, and makes the winding, the first switch assembly, the second switch assembly, and the capacitor form a boost circuit, and the first battery group supplies power to the load through the boost circuit; and

in a case that the first battery group is damaged, the controller controls the first switch assembly and the second switch assembly to be alternately in the on state, and makes the winding, the first switch assembly, the second switch assembly, and the capacitor form a boost circuit, and the second battery group supplies power to the load through the boost circuit.

7 . The battery self-heating control system according to claim 1 , wherein a switch device is arranged on the connection line, the switch device is electrically connected to the controller, and the controller is configured to control the switch device to be in the on state or the open state;

in a case that the switch device is in the on state, the battery pack supplies power to the load, and performs self-heating; and

in a case that the switch device is in the open state, the battery pack supplies power to the load only.

8 . A control method for a battery self-heating control system, the control system comprising: a battery pack, a winding, a first switch assembly, a second switch assembly, a capacitor, and a controller; the battery pack comprising a first battery group and a second battery group that are connected in series, a connection line being led out between the first battery group and the second battery group, and the connection line being connected to one end of the winding; the first switch assembly and the second switch assembly being connected in series, the first switch assembly being electrically connected to a positive electrode of the first battery group and a first end of the capacitor, the second switch assembly being electrically connected to a negative electrode of the second battery group and a second end of the capacitor, the first end and the second end of the capacitor being used for connecting to a load, and the other end of the winding being connected between the first switch assembly and the second switch assembly; and the controller being electrically connected to the first switch assembly and the second switch assembly, the controller being configured to control the first switch assembly and the second switch assembly to switch between an on state and an open state, and make the first battery group and the second battery group perform alternate charging and discharging through the winding, to heat the battery pack, and at least one of the first battery group, the second battery group, and the capacitor being configured to supply power to the load, wherein in a case that the control system is in a first state, within a first half cycle of each control cycle of the controller, the controller is configured to control the first switch assembly and the second switch assembly to switch between the on state and the open state, and the first battery group to charge the winding and charge the second battery group through the winding, and the capacitor and/or the first battery group are/is configured to supply power to the load; and within a second half cycle of each control cycle of the controller, the controller is configured to control the first switch assembly and the second switch assembly to switch between the on state and the open state, and the second battery group to charge the winding and charge the first battery group through the winding, and the capacitor and/or the second battery group are/is configured to supply power to the load, the method comprising:

controlling the first switch assembly and the second switch assembly to switch between the on state and the open state; and

making the first battery group and the second battery group perform alternate charging and discharging through the winding, to heat the battery pack.

9 . An electric vehicle, comprising the battery self-heating control system according to claim 1 .