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CN-122008966-A - Off-highway vehicle battery thermal management system and control method thereof

CN122008966ACN 122008966 ACN122008966 ACN 122008966ACN-122008966-A

Abstract

The invention provides an off-highway vehicle battery thermal management system and a control method thereof, wherein the system comprises a power battery, two compressor cooling loops, two radiator cooling waterways, an expansion kettle and a controller, wherein the cooling waterways of the power batteries are connected in parallel, each cooling waterway shares a water inlet pipeline and a water outlet pipeline, the compressor cooling loops are connected in series and are provided with a compressor, a condenser, an electronic expansion valve and a heat exchanger, the two radiator cooling waterways are connected in parallel between the water inlet pipeline and the water outlet pipeline, the radiator cooling waterways are connected in series and are provided with an electronic water pump, a three-way valve and a radiator, the lower interfaces of the two three-way valves are respectively connected with right water inlets of the two heat exchangers, the right water outlets of the two heat exchangers are respectively connected with the water inlets of the two heaters, and the water outlets of the two heaters are respectively connected with the water inlet pipeline. The invention can reduce energy consumption and can also lead the temperature uniformity of the battery to be better.

Inventors

  • DAI NAN
  • JIANG YUAN
  • WANG YUJUE
  • GUO MINGKONG
  • ZHAO WEIFENG

Assignees

  • 安徽江淮汽车集团股份有限公司

Dates

Publication Date
20260512
Application Date
20260326

Claims (10)

  1. 1. The off-highway vehicle battery thermal management system is characterized by comprising a power battery, two compressor cooling loops, two radiator cooling waterways, an expansion kettle and a controller, wherein the cooling waterways of the power battery are arranged in parallel, the cooling waterways of the power battery share a water inlet pipeline and a water outlet pipeline, the expansion kettle is connected with the water outlet pipeline, the compressor cooling loops are serially provided with a compressor, a condenser, an electronic expansion valve and a heat exchanger, the two radiator cooling waterways are arranged between the water inlet pipeline and the water outlet pipeline in parallel, the radiator cooling waterways are serially provided with an electronic water pump, a three-way valve and a radiator, lower interfaces of the two three-way valves are respectively connected with right water inlets of the heat exchangers on the two compressor cooling loops, right water outlets of the two heat exchangers are respectively connected with water inlets of the two heaters, water outlets of the two heaters are respectively connected with the water inlet pipeline, a battery water inlet temperature sensor for detecting the water inlet temperature of a battery is arranged on the water inlet pipeline, the battery water inlet temperature sensor for detecting the water inlet temperature of the battery is arranged on the water inlet pipeline, and the battery temperature sensor is connected with the temperature sensor, the water outlet temperature sensor and the battery temperature sensor.
  2. 2. A control method based on the off-highway vehicle battery thermal management system according to claim 1 is characterized by comprising the step that a controller controls the interface communication state of two three-way valves, the start and stop of two electronic water pumps, the start and stop of two compressors, the opening and closing of two electronic expansion valves and two heaters according to the refrigerating and heating requirements of a power battery so as to meet the refrigerating and heating requirements of the power battery.
  3. 3. The control method according to claim 2, wherein the controller controls the left and right ports of the two three-way valves to communicate when the ambient temperature is lower than-20 ℃ in the case where the power battery has a cooling demand, so that the cooling water flows through the radiator to enter the radiator cooling mode.
  4. 4. The control method according to claim 2, wherein in the case that the power battery has a cooling demand, when the ambient temperature is not lower than-20 ℃ but lower than 10 ℃, the radiator cooling mode is entered, and the compressor is not operated, if the battery inlet water temperature is lowered by 3 ℃ within 10 minutes, and the battery inlet water temperature is higher than the battery target inlet water temperature by 4 ℃ or higher for 5 minutes or when the battery inlet water temperature is higher than the battery target inlet water temperature by 8 ℃ or higher, the controller controls one of the compressors to be started, cools the power battery, and controls the right interface and the lower interface of the three-way valve to be communicated, and the compressor cooling mode is entered; And if the water inlet temperature of the battery is higher than the target water inlet temperature of the battery by more than 8 ℃ and the duration is longer than 10min, or if the water inlet temperature of the battery is higher than the target water inlet temperature of the battery by more than 12 ℃ and the duration is longer than 2min, the controller controls the two compressors to be started to cool the power battery, and if the water inlet temperature of the battery is higher than the target water inlet temperature of the battery by more than 2 ℃, the controller exits the compressor cooling mode and starts the radiator cooling mode.
  5. 5. The control method according to claim 2, wherein in the case where there is a cooling demand of the power battery, when the ambient temperature is higher than 10 ℃ and the ambient temperature is lower than the battery target water intake temperature by more than 5 ℃, the radiator cooling mode is turned on, and the compressors are not operated, and when the battery water intake temperature is lowered by less than 3 ℃ and the battery water intake temperature is higher than the battery target water intake temperature by more than 4 ℃ for 5 minutes or the battery water intake temperature is higher than the battery target water intake temperature by more than 8 ℃, the compressor cooling mode is switched to, and one of the compressors is turned on to cool the power battery, and when the battery water intake temperature is higher than the battery target water intake temperature by more than 8 ℃ and the duration is longer than 10 minutes or when the battery water intake temperature is higher than the battery target water intake temperature by more than 12 ℃ and the duration is longer than 2 minutes, the two compressors are turned on to cool the power battery, and when the battery water intake temperature is higher than the battery target water intake temperature by 2 ℃ and the battery water intake temperature is higher than the battery target water intake temperature, the compressor cooling mode is exited, the radiator cooling mode is turned on.
  6. 6. The control method according to claim 2, wherein when the power battery has a cooling demand, if the ambient temperature is higher than 10 ℃, the battery intake temperature is higher than the battery target intake temperature by more than 5 ℃ if the ambient temperature is lower than the battery target intake temperature by less than 5 ℃, the radiator cooling mode is turned on, the compressor is not operated, if the battery intake temperature is lowered by less than 3 ℃ within 10 minutes, and the battery intake temperature is higher than the battery target intake temperature by more than 4 ℃ for 5 minutes, or the battery intake temperature is higher than the battery target intake temperature by more than 8 ℃, the compressor cooling mode is switched, one of the compressors is turned on to cool the power battery, if the battery intake temperature is higher than the battery target intake temperature by more than 8 ℃ for more than 10 minutes, or when the battery intake temperature is higher than the battery target intake temperature by more than 12 ℃ for more than 2 minutes, the two compressors are turned on to cool the power battery, and when the battery intake temperature is higher than the battery target intake temperature by 2 ℃ and the radiator cooling mode is turned off.
  7. 7. The control method according to claim 2, wherein when the power battery has a cooling requirement, if the ambient temperature is higher than 10 ℃ and the temperature difference between the battery inlet water temperature and the battery inlet water temperature is lower than 5 ℃ and lower than the battery target inlet water temperature, the radiator cooling mode is started, the compressor is not operated, if the battery inlet water temperature is higher than 5 ℃ within 10min, one of the compressors is started to cool the power battery, if the battery inlet water temperature is higher than 8 ℃ and higher than the battery target inlet water temperature for a duration of more than 10min or when the battery inlet water temperature is higher than 12 ℃ and higher than 2min, two compressors are started to cool the power battery, and when the battery inlet water temperature is higher than the battery target inlet water temperature by 2 ℃ and lower than the battery target inlet water temperature, the compressor cooling mode is started.
  8. 8. The control method according to claim 2, wherein when the power battery has a cooling demand, when the ambient temperature is higher than 10 ℃ and the ambient temperature is higher than the battery target water intake temperature, the radiator cooling mode is turned on, the compressor is not operated, when the battery water intake temperature is lower by 3 ℃ and the battery water intake temperature is higher than the battery target water intake temperature by 4 ℃ and for 5 minutes or when the battery water intake temperature is higher than the battery target water intake temperature by 8 ℃ or more within 10 minutes, one of the compressors is turned on to cool the power battery, and when the battery water intake temperature is higher than the battery target water intake temperature by 8 ℃ and for more than 10 minutes or when the battery water intake temperature is higher than the battery target water intake temperature by 12 ℃ and for more than 2 minutes, the two compressors are turned on to cool the power battery, and when the battery water intake temperature is higher than the battery target water intake temperature by 2 ℃ and for more than 2 minutes, the radiator cooling mode is turned off.
  9. 9. A control method according to any one of claims 3 to 8, wherein in the compressor cooling mode, if one of the compressors fails, the other compressor is started to operate.
  10. 10. The control method according to claim 2, wherein the controller controls both heaters to be started when the water inlet temperature of the battery is lower than 0 ℃ to heat the power battery, and only one heater is started to heat after the water inlet temperature of the battery is raised to the target water temperature and the power of the heater is regulated to reduce the power consumption when the battery has a heating requirement.

Description

Off-highway vehicle battery thermal management system and control method thereof Technical Field The invention belongs to the technical field of vehicle control, and particularly relates to an off-highway vehicle battery thermal management system and a control method thereof. Background Along with the popularization of new energy automobiles, in the field of off-highway vehicles, more and more whole factories develop and produce pure electric automobiles. The off-highway vehicle has poor running road condition and high reliability requirement, and the battery thermal management system is generally realized by adopting an independent thermal management unit at present. Along with the continuous increase of the number of the power batteries, an independent unit cannot meet the heat dissipation requirement, a multi-unit scheme is generally adopted to solve the problem, because the cooling waterways among the multi-units are mutually independent, each unit is independently controlled, each unit is responsible for the cooling and heating requirements of the corresponding power battery, and the like, when one unit fails, the temperature difference between the power battery loop where the unit is positioned and the power batteries of other loops is larger, the influence on the temperature uniformity of each power battery is larger, and the multi-unit needs to work and stop at the same time, and the refrigeration of the power batteries is completed by the compressor, so that the energy consumption is larger. Therefore, how to design an off-highway vehicle battery thermal management system and a control method thereof to reduce energy consumption and make the battery temperature uniformity better is a technical problem which needs to be solved by those skilled in the art. Disclosure of Invention The invention aims to provide an off-highway vehicle battery thermal management system and a control method thereof, which are used for solving the technical problems in the prior art. In order to achieve the above purpose, the present invention provides the following technical solutions: The off-highway vehicle battery thermal management system comprises a power battery, two compressor cooling loops, two radiator cooling waterways, an expansion kettle and a controller, wherein the cooling waterways of the power battery are arranged in parallel, the cooling waterways share a water inlet pipeline and a water outlet pipeline, the expansion kettle is connected with the water outlet pipeline, the compressor cooling loops are serially provided with a compressor, a condenser, an electronic expansion valve and a heat exchanger, the two radiator cooling waterways are arranged between the water inlet pipeline and the water outlet pipeline in parallel, the radiator cooling waterways are serially provided with an electronic water pump, a three-way valve and a radiator, the lower interfaces of the two three-way valves are respectively connected with the water inlets of the two heaters on the right sides of the heat exchangers on the compressor cooling loops, the water outlets of the two heaters are respectively connected with the water inlets of the two heaters, the water inlet pipeline is provided with a battery water inlet temperature sensor for detecting the water inlet temperature of a battery, the water outlet pipeline is provided with the battery water inlet temperature sensor for detecting the water inlet temperature of the battery, the three-way valve, the temperature sensor for the battery outlet temperature sensor and the electronic water inlet temperature sensor, the electronic water inlet valve and the electronic water pump. The control method based on the off-highway vehicle battery thermal management system comprises the step that a controller controls the interface communication state of two three-way valves, the start and stop of two electronic water pumps, the start and stop of two compressors, the opening and closing of two electronic expansion valves and two heaters according to the refrigerating and heating requirements of a power battery so as to meet the refrigerating and heating requirements of the power battery. Preferably, in the case of a power battery having a cooling requirement, when the ambient temperature is lower than-20 ℃, the controller controls the left and right interfaces of the two three-way valves to communicate, so that the cooling water flows through the radiator and enters a radiator cooling mode. Preferably, under the condition that the power battery has refrigeration requirement, when the ambient temperature is not lower than minus 20 ℃ but lower than 10 ℃, the radiator cooling mode is entered, the compressor does not work, if the battery water inlet temperature is reduced within 3 ℃ within 10min and is higher than the battery target water inlet temperature by more than 4 ℃ for 5min or when the battery water inlet temperature is higher than the battery target water inlet temperature by more th