CN-117266303-B - Integrated thermal management system, thermal management control method and electric excavator

Abstract

The invention discloses an integrated thermal management system, a thermal management control method and an electric excavator. The integrated heat management system comprises a hydraulic cooling system, a first heat exchanger, a battery heat management system and a switching device, wherein the hydraulic cooling system is provided with a hydraulic cooling loop, a phase change heat storage device is arranged on the hydraulic cooling loop, a first heat storage channel and a second heat storage channel are arranged in the phase change heat storage device, a phase change heat storage material is arranged in the phase change heat storage device and used for carrying out heat exchange with the first heat storage channel and the second heat storage channel, the battery heat management system is provided with a battery heat exchange loop, the battery heat exchange loop comprises a battery heat exchange trunk, and a heating pipeline and a connecting pipeline which are connected with the battery heat exchange trunk and are arranged in parallel, the heating pipeline is communicated into the second heat storage channel and carries out heat exchange with the phase change heat storage device, and the switching device switches the heating pipeline or the connecting pipeline to be communicated with the battery heat exchange trunk. And recovering heat in the hydraulic cooling system through the phase change heat storage device.

Inventors

• LI SIWEN
• LI WENMING
• LI HONGTAO

Assignees

• 三一重机有限公司

Dates

Publication Date

20260505

Application Date

20230922

Claims (10)

1. 1. An integrated thermal management system, comprising: The hydraulic cooling system is provided with a hydraulic cooling loop, a phase-change heat storage device is arranged on the hydraulic cooling loop, a first heat storage channel and a second heat storage channel are arranged in the phase-change heat storage device, and a phase-change heat storage material is arranged in the phase-change heat storage device and used for carrying out heat exchange with the first heat storage channel and the second heat storage channel; The first heat exchanger is provided with two first heat exchange channels capable of mutually exchanging heat, one of the first heat exchange channels is arranged on the hydraulic cooling loop, the liquid outlet end of the first heat exchange channel is communicated with the first heat storage channel, and the other first heat exchange channel is arranged on a hydraulic oil loop of the hydraulic system of the excavator so as to transfer heat generated by the hydraulic system of the excavator to the hydraulic cooling loop; The battery heat management system is provided with a battery heat exchange loop, the battery heat exchange loop comprises a battery heat exchange trunk, and a heating pipeline and a connecting pipeline which are connected with the battery heat exchange trunk and are arranged in parallel, the heating pipeline is communicated into the second heat storage channel and is used for carrying out heat exchange with the phase change heat storage device, and the battery heat exchange loop comprises a battery heat exchange trunk, and a heating pipeline and a connecting pipeline which are connected with the battery heat exchange trunk and are arranged in parallel And the switching device is used for switching the heating pipeline or enabling the connecting pipeline to be communicated with the battery heat exchange trunk.
2. 2. The integrated thermal management system of claim 1, wherein the switching device comprises two three-way valves, three ports of both three-way valves being respectively connected to the heating line, the connecting line, and the battery heat exchanging trunk.
3. 3. The integrated thermal management system of claim 1, further comprising an air conditioning thermal management system having an air conditioning refrigerant circuit formed thereon; The integrated heat management system further comprises a second heat exchanger, two second heat exchange channels capable of mutually exchanging heat are formed on the second heat exchanger, one of the second heat exchange channels is arranged on the air conditioner refrigerant circuit, and the other second heat exchange channel is arranged on the battery heat exchange dry circuit.
4. 4. The integrated thermal management system of claim 3, wherein the air conditioning refrigerant circuit comprises a refrigerant trunk, and a first refrigerant branch and a second refrigerant branch both in communication with the refrigerant trunk and arranged in parallel, the first refrigerant branch being provided with a first throttling device; One of the second heat exchange channels is arranged on the first refrigerant branch.
5. 5. The integrated thermal management system of claim 1, further comprising an air conditioning thermal management system, wherein an air conditioning refrigerant loop is formed on the air conditioning thermal management system, a condenser is arranged on the air conditioning refrigerant loop, and a heat dissipation fan is arranged corresponding to the condenser; the hydraulic cooling loop is provided with a cooling pipeline which is communicated to the liquid outlet end of the first heat storage channel and is arranged corresponding to the heat radiation fan.
6. 6. A thermal management control method based on an integrated thermal management system according to any one of claims 1 to 5, characterized in that the thermal management control method comprises: Acquiring the actual working temperature of the battery heat exchange main path at the outlet side of the battery pack; And controlling the switching device to work according to the actual working temperature so as to select one of the heating pipeline and the connecting pipeline to be communicated with the battery heat exchange trunk.
7. 7. The thermal management control method according to claim 6, wherein said controlling operation of said switching device according to said actual operation temperature to select one of said heating pipe and said connecting pipe to be in communication with said battery heat exchanging trunk includes: when the actual working temperature is smaller than a first preset temperature, the switching device is controlled to switch the heating pipeline to be communicated with the battery heat exchange main circuit; And when the actual working temperature is higher than a first preset temperature, determining a cooling strategy, and cooling the liquid flowing through the battery heat exchange dry circuit according to the cooling strategy.
8. 8. The method of claim 7, wherein the integrated thermal management system comprises an air conditioning thermal management system, the air conditioning thermal management system having an air conditioning refrigerant loop formed thereon, the air conditioning refrigerant loop comprising a first refrigerant branch having a first throttling device disposed thereon; And when the actual working temperature is greater than a first preset temperature, determining a cooling strategy, and cooling the liquid flowing through the battery heat exchange dry circuit according to the cooling strategy, wherein the cooling strategy comprises the following steps of: When the actual working temperature is higher than the first preset temperature and lower than the second preset temperature, the switching device is controlled to switch the connecting pipeline to be communicated with the battery heat exchange trunk; When the actual working temperature is higher than a second preset temperature, the switching device is controlled to switch the connecting pipeline to be communicated with the battery heat exchange main circuit, a compressor on the air conditioner heat management system is started, and the first throttling device is controlled to start the first refrigerant branch circuit; wherein the second preset temperature is greater than the first preset temperature.
9. 9. The method according to claim 6, wherein the integrated thermal management system further comprises an air conditioning thermal management system, a heat dissipation fan is arranged on the air conditioning thermal management system, and a cooling pipeline is arranged on the hydraulic cooling loop; The thermal management control method further includes: Acquiring the temperature of cold liquid in the cooling pipeline; and when the temperature of the cold liquid is higher than a third preset temperature, controlling the cooling fan to start.
10. 10. An electric excavator comprising an integrated thermal management system according to any one of claims 1 to 5.

Description

Integrated thermal management system, thermal management control method and electric excavator Technical Field The invention relates to the technical field of engineering machinery, in particular to an integrated heat management system, a heat management control method and an electric excavator. Background Along with the great initiative of the nation for clean energy, all mainstream engineering machinery manufacturers sequentially lay out motorized products. At present, an air conditioning system, a heat radiation system and a battery heat management system of the electric excavator are relatively independent, structural arrangement is relatively complex, all subsystems of the heat management of the electric excavator are mutually independent, cost is high, one excavator needs to be provided with a plurality of sets of heat management schemes, whole vehicle energy consumption is high, and endurance mileage is affected. In the prior art, the battery pack and the excavator hydraulic system are respectively heated or cooled by controlling the air conditioning system, so that the heat in the battery and the excavator hydraulic system can be partially recovered only in the process of heating a cab, and the waste heat recovery and reasonable redistribution effects on the electric drive system of the electric engineering machinery and the excavator hydraulic system are poor. Disclosure of Invention The invention mainly aims to provide an integrated heat management system, a heat management control method and an electric excavator, and aims to solve the problem of poor waste heat recovery effect of the electric excavator. To achieve the above object, the present invention provides an integrated thermal management system comprising: The hydraulic cooling system is provided with a hydraulic cooling loop, a phase-change heat storage device is arranged on the hydraulic cooling loop, a first heat storage channel and a second heat storage channel are arranged in the phase-change heat storage device, and a phase-change heat storage material is arranged in the phase-change heat storage device and used for carrying out heat exchange with the first heat storage channel and the second heat storage channel; The first heat exchanger is provided with two first heat exchange channels capable of mutually exchanging heat, one of the first heat exchange channels is arranged on the hydraulic cooling loop, the liquid outlet end of the first heat exchange channel is communicated with the first heat storage channel, and the other first heat exchange channel is arranged on a flow path of the hydraulic system of the excavator; The battery heat management system is provided with a battery heat exchange loop, the battery heat exchange loop comprises a battery heat exchange trunk, and a heating pipeline and a connecting pipeline which are connected with the battery heat exchange trunk and are arranged in parallel, the heating pipeline is communicated into the second heat storage channel and is used for carrying out heat exchange with the phase change heat storage device, and the battery heat exchange loop comprises a battery heat exchange trunk, and a heating pipeline and a connecting pipeline which are connected with the battery heat exchange trunk and are arranged in parallel And the switching device is used for switching the heating pipeline or the connecting pipeline to be communicated with the battery heat exchange trunk. Optionally, the switching device includes two three-way valves, and two three ports of the three-way valves are all respectively connected to the heating pipeline, the connecting pipeline and the battery heat exchange trunk. Optionally, the integrated thermal management system further comprises an air conditioner thermal management system, and an air conditioner refrigerant loop is formed on the air conditioner thermal management system; the integrated heat management system further comprises a second heat exchanger, wherein two second heat exchange channels capable of mutually exchanging heat are formed in the second heat exchanger, one of the second heat exchange channels is arranged on the air conditioner refrigerant circuit, and the other second heat exchange channel is arranged on the battery heat exchange circuit. Optionally, the air conditioner refrigerant loop comprises a refrigerant trunk, and a first refrigerant branch and a second refrigerant branch which are communicated with the refrigerant trunk and are arranged in parallel, wherein a first throttling device is arranged on the first refrigerant branch; One of the second heat exchange channels is arranged on the first refrigerant branch. Optionally, the integrated thermal management system further comprises an air conditioner thermal management system, an air conditioner refrigerant loop is formed on the air conditioner thermal management system, a condenser is arranged on the air conditioner refrigerant loop, and a heat dissipation fan is arranged corres