Heating system, heating method and apparatus, and electric device
A heating system includes first and second input ends, first and second battery modules, first switch and second switches, and a control unit. The first switch is connected between first terminals of the first and second battery modules. Second terminals of the first and second battery modules are connected to each other. The second switch is connected between the first input end and the first terminal of the second battery module. The second input end is connected to the first terminal of the first battery module. The first terminals of the first and second battery modules have a same polarity, and the second terminals of the first and second battery modules have a same polarity. The control unit is connected to the first and second switches, and configured to control the first and second switches to be turned on or off.
1. A heating system, comprising:
a first input end and a second input end, wherein the first input end and the second input end are configured to connect to two terminals of an external input power source, respectively;
a first battery module, a second battery module, a first switch, and a second switch, wherein:
a first terminal of the first switch is connected to a first terminal of the first battery module, and a second terminal of the first switch is connected to a first terminal of the second battery module, the first terminal of the first battery module and the first terminal of the second battery module having a same polarity, the first switch being configured to control a connection between the first terminal of the battery module and the first terminal of the second battery module;
a second terminal of the first battery module is connected to a second terminal of the second battery module, the second terminal of the first battery module and the second terminal of the second battery module having a same polarity, the polarity of the first terminal of the first battery being opposite to the polarity of the second terminal of the first battery;
a first terminal of the second switch is connected to between the first input end, and a second terminal of the second switch is connected to the first terminal of the second battery module, the second switch being configured to control a connection between the first input end and the first terminal of the second battery module; and
the second input end is connected to the first terminal of the first battery module;
and
a control unit, wherein the control unit is connected to the first switch and the second switch, and the control unit is configured to control the first switch and the second switch to be turned on or off, to heat the first battery module and the second battery module through the input power source.
2. The heating system according to claim 1 , wherein the first terminal of the second battery module is connected to a first terminal of a load through a first main switch, and the second terminal of the second battery module is connected to a second terminal of the load through a second main switch; and
the first main switch is the second switch.
3. The heating system according to claim 1 , wherein:
a voltage between the first terminal and the second terminal of the first battery module is equal to a voltage between the first terminal and the second terminal of the second battery module.
4. The heating system according to claim 3 , wherein:
the first battery module and the second battery module each comprise N battery packs, wherein N is a positive integer; and
the N battery packs of the first battery module are connected in parallel, and the N battery packs of the second battery module are connected in parallel.
5. The heating system according to claim 1 , wherein:
the control unit is further configured to control the first switch to be turned off, and control, by using a control signal with a duty cycle, the second switch to be turned on or off, to heat the first battery module and the second battery module through the input power source; and
the control signal with the duty cycle is configured to cause a root mean square value of an output current of the input power source to be less than a root mean square value of a current threshold.
6. The heating system according to claim 1 , wherein the control unit is further configured to, after the first battery module and the second battery module are heated through the input power source:
in response to a temperature of the first battery module and a temperature of the second battery module being both greater than or equal to a temperature threshold, control the second switch to be turned off, and control the first switch to be turned on after the second switch remains off for a predetermined period of time.
7. A heating method, applied to the heating system according to claim 1 , the method comprising:
in response to receiving a heating request signal, controlling switch states of the first switch and the second switch to heat the first battery module and the second battery module, wherein the switch state comprises on or off.
8. The heating method according to claim 7 , wherein:
controlling the switch states of the first switch and the second switch to heat the first battery module and the second battery module comprises:
controlling the first switch to be turned off, and controlling, by using a control signal with a duty cycle, the second switch to be turned on or off, to heat the first battery module and the second battery module; and
the control signal with the duty cycle is configured to cause a root mean square value of an output current of the input power source to be less than a root mean square value of a current threshold.
9. The method according to claim 7 , further comprising, after heating the first battery module and the second battery module:
in response to a temperature of the first battery module and a temperature of the second battery module being both greater than or equal to a temperature threshold, controlling the second switch to be turned off, and controlling the first switch to be turned on after the second switch remains off for a predetermined period of time.
10. An electric device, comprising a heating system comprising:
a first input end and a second input end, wherein the first input end and the second input end are configured to connect to two terminals of an external input power source, respectively;
a first battery module, a second battery module, a first switch, and a second switch, wherein:
a first terminal of the first switch is connected to a first terminal of the first battery module, and a second terminal of the first switch is connected to a first terminal of the second battery module, the first terminal of the first battery module and the first terminal of the second battery module having a same polarity, the first switch being configured to control a connection between the first terminal of the battery module and the first terminal of the second battery module;
a second terminal of the first battery module is connected to a second terminal of the second battery module, the second terminal of the first battery module and the second terminal of the second battery module having a same polarity, the polarity of the first terminal of the first battery being opposite to the polarity of the second terminal of the first battery;
a first terminal of the second switch is connected to between the first input end, and a second terminal of the second switch is connected to the first terminal of the second battery module, the second switch being configured to control a connection between the first input end and the first terminal of the second battery module; and
the second input end is connected to the first terminal of the first battery module;
and
a control unit, wherein the control unit is connected to the first switch and the second switch, and the control unit is configured to control the first switch and the second switch to be turned on or off, to heat the first battery module and the second battery module through the input power source.
11. The electric device according to claim 10 , wherein the first terminal of the second battery module is connected to a first terminal of a load through a first main switch, and the second terminal of the second battery module is connected to a second terminal of the load through a second main switch, and
the first main switch is the second switch.
12. The electric device according to claim 10 , wherein:
a voltage between the first terminal and the second terminal of the first battery module is equal to a voltage between the first terminal and the second terminal of the second battery module.
13. The electric device according to claim 12 , wherein:
the first battery module and the second battery module each comprise N battery packs, wherein N is a positive integer; and
the N battery packs of the first battery module are connected in parallel, and the N battery packs of the second battery module are connected in parallel.
14. The electric device according to claim 10 , wherein:
the control unit is further configured to control the first switch to be turned off, and control, by using a control signal with a duty cycle, the second switch to be turned on or off, to heat the first battery module and the second battery module through the input power source; and
the control signal with the duty cycle is configured to cause a root mean square value of an output current of the input power source to be less than a root mean square value of a current threshold.
15. The electric device according to claim 10 , wherein the control unit is further configured to, after the first battery module and the second battery module are heated through the input power source:
in response to a temperature of the first battery module and a temperature of the second battery module being both greater than or equal to a temperature threshold, control the second switch to be turned off, and control the first switch to be turned on after the second switch remains off for a predetermined period of time.