CN-224234046-U - Full-immersion power module and charging system

Abstract

The application discloses a full-immersion type power module and a charging system, and relates to the technical field of charging. The power module comprises a PCBA component, wherein the PCBA component is fully immersed in insulating cooling liquid, the PCBA component comprises an AC/DC conversion circuit and a heating circuit, the heating circuit is arranged between the AC/DC conversion circuit and an AC power supply, the heating circuit comprises a heating unit and a switching unit, the heating unit and the switching unit are connected in parallel or in series, and the switching unit is used for conducting the heating unit in a closed or an off state so that the heating unit heats the insulating cooling liquid. Therefore, the insulating cooling liquid is heated through the power module, and the problem of reliability reduction of the charging system caused by low temperature of the insulating cooling liquid is solved.

Inventors

• DAI JIESHI
• FAN YANGPING

Assignees

• 领充新能源科技有限公司

Dates

Publication Date

20260512

Application Date

20250603

Claims (10)

1. 1. A fully submerged power module, characterized in that the power module comprises a PCBA assembly, the PCBA assembly is fully submerged in an insulating coolant, the PCBA assembly comprises an AC/DC conversion circuit and a heating circuit; The heating circuit is arranged between the AC/DC conversion circuit and the AC power supply, the heating circuit comprises a heating unit and a switching unit, the heating unit and the switching unit are connected in parallel or in series, and the switching unit is used for conducting the heating unit in a closed or an off state so that the heating unit heats the insulating cooling liquid.
2. 2. The fully submerged power module of claim 1, characterized in that the heating unit comprises at least 1 heating subunit, the switching unit comprises at least 1 switching subunit, each heating subunit being connected in parallel or in series with a corresponding switching subunit, respectively; The switch subunit is used for switching on the heating subunit in a switching-off state under the condition that the heating subunit is connected with the corresponding switch subunit in parallel; In case the heating subunit is connected in series with the corresponding switching subunit, the switching subunit is configured to turn on the heating subunit in a closed state.
3. 3. The fully submerged power module of claim 2, characterized in that the alternating current power supply is connected with the AC/DC converting circuit through three input lines; and under the condition that the heating subunit is connected with the corresponding switch subunit in series, one end of the heating circuit is connected to at least one input line, and the other end of the heating circuit is connected with an N line.
4. 4. A fully submerged power module according to claim 3, wherein the heating unit comprises 3 heating subunits, the first ends of the heating subunits are respectively connected with the three input lines in a one-to-one correspondence, and the second ends of the heating subunits are connected with the corresponding switch subunits; in the case that the number of the switch subunits is 1, the second end of each heating subunit is connected with the switch subunits; In the case that the number of the switch subunits is 2, the second ends of any two heating subunits are connected with one switch subunit, and the second ends of the rest heating subunits are connected with the other switch subunits; and under the condition that the number of the switch subunits is 3, each heating subunit is respectively connected with each switch subunit in a one-to-one correspondence manner.
5. 5. The fully submerged power module of claim 2, characterized in that the ac power supply comprises three outputs; One end of each heating subunit is respectively connected with a corresponding output end of the alternating current power supply, the other end of each heating subunit is connected with the AC/DC conversion circuit, and each switching subunit is respectively connected with the corresponding heating subunit in parallel.
6. 6. A fully submerged power module according to any of claims 2-4, characterized in that the heating subunit comprises at least one heating device, the switching subunit comprises a switching tube; The heating devices are connected in series and/or in parallel.
7. 7. The fully submerged power module of claim 1, further comprising a temperature sensing device; The temperature detection device is arranged in the insulating cooling liquid and is connected with the controller, and the temperature detection device is used for detecting the current temperature of the insulating cooling liquid and transmitting the current temperature of the insulating cooling liquid to the controller.
8. 8. The fully submerged power module of claim 3 or 4, characterized in that the PCBA assembly further comprises an input EMC module; one end of the input EMC module is connected with the alternating current power supply, and the other end of the input EMC module is connected with the AC/DC conversion circuit; One end of the heating unit is connected between the alternating current power supply and the input EMC module, or one end of the heating unit is connected between the input EMC module and the AC/DC conversion circuit.
9. 9. The fully submerged power module of claim 1, wherein the PCBA component further comprises a DC/DC conversion circuit that includes a transformation rectifier module, an output switch module, an output electrolysis module, and an anti-reflection module; One end of the transformation rectifying module is connected with the AC/DC conversion circuit, the other end of the transformation rectifying module is connected with one end of the output switch module, and the output switch module is connected with a first input end and a second output end of the output electrolysis module; The first output end of the output electrolysis module is connected with one end of the anti-reflection module, the second output end of the output electrolysis module is connected with the negative end of the load, and the other end of the anti-reflection module is connected with the positive end of the load.
10. 10. A charging system comprising at least two power modules according to any of claims 1 to 9, a controller, a power distribution device and at least one charging interface; the power distribution device is respectively connected with the controller, each power module and each charging interface; the controller is respectively connected with each power module; For any power module, the controller is used for receiving the current temperature of the insulating cooling liquid output by the temperature detection device in the power module, and outputting a control signal to a switch unit of a heating circuit in the power module when the current temperature of the insulating cooling liquid is smaller than a first temperature value, wherein the control signal is used for controlling the heating circuit to be conducted so that the heating unit of the heating circuit heats the insulating cooling liquid.

Description

Full-immersion power module and charging system Technical Field The application relates to the technical field of charging, in particular to a full-immersion power module and a charging system. Background With the popularization of electric automobiles, the performance and reliability requirements of high-power modules are increasingly improved. In the design of oil-based immersed liquid cooling power modules, high-insulation cooling liquid such as mineral oil is generally adopted, the specific heat capacity of the high-insulation cooling liquid is far higher than that of air, and the high-insulation cooling liquid can effectively dissipate heat, but new problems can be caused in the low-temperature or ultralow-temperature environment of the insulation cooling liquid. Firstly, the viscosity of the insulating cooling liquid is increased, the circulation resistance of the system is increased, even the local pressure is too high, and the normal operation of the liquid cooling system is influenced, secondly, when an electronic device (such as an electrolytic capacitor) works in the insulating cooling liquid at low temperature for a long time, the performance index (such as equivalent series resistance, capacity and the like) of the electronic device can be obviously degraded, and if the electronic device is directly started to charge, the output characteristic is possibly deteriorated, the charging efficiency is influenced, and even the equipment is damaged. In addition, the inside of the module in a low-temperature environment may generate local overheating due to uneven heat dissipation, which further threatens the reliability of the system. Disclosure of utility model The application mainly aims to provide a full-immersion type power module and a charging system, so that insulating cooling liquid is heated by the power module, and the problem of reliability reduction of the charging system caused by low temperature of the insulating cooling liquid is solved. In order to achieve the above purpose, the application provides a fully-immersed power module, which comprises a PCBA component, wherein the PCBA component is fully immersed in insulating cooling liquid, the PCBA component comprises an AC/DC conversion circuit and a heating circuit, the heating circuit is arranged between the AC/DC conversion circuit and an AC power supply, the heating circuit comprises a heating unit and a switching unit, the heating unit and the switching unit are connected in parallel or in series, and the switching unit is used for conducting the heating unit in a closed or an off state so as to enable the heating unit to heat the insulating cooling liquid. Optionally, the heating unit comprises at least 1 heating subunit, the switching unit comprises at least 1 switching subunit, each heating subunit is connected with the corresponding switching subunit in parallel or in series, the switching subunit is used for conducting the heating subunit in an off state when the heating subunit is connected with the corresponding switching subunit in parallel, and the switching subunit is used for conducting the heating subunit in a closed state when the heating subunit is connected with the corresponding switching subunit in series. Optionally, the alternating current power supply is connected with the AC/DC conversion circuit through three input lines, one end of the heating circuit is connected to at least one input line when the heating subunit is connected with the corresponding switch subunit in series, and the other end of the heating circuit is connected with an N line. Optionally, the heating circuit includes 3 heating subunits, wherein a first end of each heating subunit is connected with three input lines in a one-to-one correspondence, a second end of each heating subunit is connected with a corresponding switch subunit, in the case that the number of the switch subunits is 1, a second end of each heating subunit is connected with the switch subunits, in the case that the number of the switch subunits is 2, second ends of any two heating subunits are connected with one switch subunit, second ends of the rest heating subunits are connected with the other switch subunits, and in the case that the number of the switch subunits is 3, each heating subunit is connected with each switch subunit in a one-to-one correspondence. Optionally, the alternating current power supply comprises three output ends, one end of each heating subunit is respectively connected with the corresponding output end of the alternating current power supply, the other end of each heating subunit is connected with the AC/DC conversion circuit, and each switching subunit is respectively connected with the corresponding heating subunit in parallel. Optionally, the heating subunit comprises at least one heating device, the switch subunit comprises a switch tube, and the heating devices are connected in series and/or in parallel. Optionally, the power module further com