CN113097602B - Thermal management system and heating method of battery pack - Google Patents

Thermal management system and heating method of battery pack Download PDF

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Publication number
CN113097602B
CN113097602B CN202110259329.XA CN202110259329A CN113097602B CN 113097602 B CN113097602 B CN 113097602B CN 202110259329 A CN202110259329 A CN 202110259329A CN 113097602 B CN113097602 B CN 113097602B
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CN
China
Prior art keywords
heat dissipation
battery pack
reversing valve
motor
dissipation loop
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CN202110259329.XA
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CN113097602A (en
Inventor
赵建雄
郭盛昌
黄小清
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Chongqing Jinkang Power New Energy Co Ltd
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Chongqing Jinkang Power New Energy Co Ltd
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Publication of CN113097602A publication Critical patent/CN113097602A/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/615—Heating or keeping warm
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
    • B60L58/27—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by heating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
    • H01M10/625—Vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/63—Control systems
    • H01M10/637—Control systems characterised by the use of reversible temperature-sensitive devices, e.g. NTC, PTC or bimetal devices; characterised by control of the internal current flowing through the cells, e.g. by switching
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6554—Rods or plates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/655—Solid structures for heat exchange or heat conduction
    • H01M10/6556—Solid parts with flow channel passages or pipes for heat exchange
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/657—Means for temperature control structurally associated with the cells by electric or electromagnetic means
    • H01M10/6571—Resistive heaters
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/66—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells
    • H01M10/663—Heat-exchange relationships between the cells and other systems, e.g. central heating systems or fuel cells the system being an air-conditioner or an engine
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The invention belongs to the technical field of battery packs, and particularly relates to a thermal management system of a battery pack, which comprises: an engine cooling circuit for cooling the engine; the motor and the electric control heat dissipation loop are used for cooling the motor and the electric control element; the liquid cooling plate is used for adjusting the temperature of the battery pack; the engine heat dissipation loop, the motor and the electric control heat dissipation loop are connected to the liquid cooling plate through a reversing valve. According to the technical scheme, the first cooling liquid in the engine heat dissipation loop can be used for collecting the waste heat of the engine, or the second cooling liquid in the motor and the electric control heat dissipation loop is used for collecting the waste heat of the motor and the electric control element, the first cooling liquid or the second cooling liquid can directly enter the liquid cooling plate to heat the battery cell in the battery pack, the utilization rate of the waste heat is high, the energy consumption of the whole vehicle can be effectively reduced, and the endurance mileage is improved.

Description

Thermal management system and heating method of battery pack
Technical Field
The invention relates to the technical field of battery packs, in particular to a thermal management system and a heating method of a battery pack.
Background
Some new energy automobiles need to use a power battery as a power source, the performance of the power battery is greatly influenced by temperature, the power battery needs to be cooled in a high-temperature environment, and a battery pack needs to be heated in the high-temperature environment. Particularly, in a low-temperature environment, the capacity and the working voltage of the power battery are both obviously reduced, so that in the low-temperature environment, the power performance of the extended range electric vehicle is poor, the endurance mileage is greatly reduced, and even after long-time low-temperature vehicle immersion, the power battery cannot be charged and discharged due to too low temperature.
For the problem that the performance of the power battery is reduced under the low-temperature condition, most automobiles heat the battery pack through a heating device, so that the power battery works at the proper temperature. However, maintaining the temperature of the battery directly by the heating device consumes power of the power battery, and thus the energy consumption of the vehicle is high, resulting in a decrease in the driving range of the vehicle.
Disclosure of Invention
In order to solve the problems, the invention provides a thermal management system of a battery pack, which can reduce the energy consumption of an automobile and improve the driving mileage of the automobile by reasonably utilizing the waste heat of an engine, a motor and an electric control element to heat a power battery.
The scheme of the invention is as follows:
a thermal management system for a battery pack, comprising:
an engine cooling circuit for cooling the engine;
the motor and the electric control heat dissipation loop are used for cooling the motor and the electric control element;
the liquid cooling plate is used for adjusting the temperature of the battery pack;
the engine heat dissipation loop, the motor and the electric control heat dissipation loop are connected to the liquid cooling plate through a reversing valve.
Preferably, the thermal management system of the battery pack further comprises a vehicle-mounted air conditioning loop; the vehicle-mounted air conditioning loop is connected to the liquid cooling plate.
Preferably, the liquid cooling plate comprises a first cavity and a second cavity which are independent from each other;
two ends of the first cavity are connected to the reversing valve through a first pipeline, and the engine heat dissipation loop, the motor and the electric control heat dissipation loop are communicated to the first cavity through the reversing valve;
and two ends of the second cavity are communicated to the vehicle-mounted air conditioning loop.
Preferably, the liquid cooling plate is a harmonica tube; a harmonica pipe channel in the middle of the liquid cooling plate is the second cavity; the harmonica pipe channels on two sides of the second cavity are the first cavity.
Preferably, a PTC heating device is provided on the first pipeline.
Preferably, the thermal management system of the battery pack further comprises an external heat dissipation loop; the external heat dissipation loop is communicated to the first cavity through the reversing valve.
Preferably, two ends of the first cavity are respectively connected with a No. 1,2 port of the reversing valve through a first pipeline; the motor and the electric control heat dissipation loop are connected with a No. 4,5 port of the reversing valve; the engine heat dissipation loop is connected to a port 5,6 of the reversing valve; the external heat dissipation loop is connected to a port 7,8 of the reversing valve.
Preferably, the reversing valve is actuated in a pulsed manner.
The heating method of the battery pack comprises an engine heat dissipation loop, a motor, an electric control heat dissipation loop and a liquid cooling plate;
the engine heat dissipation loop, the motor and the electric control heat dissipation loop are connected with the liquid cooling plate through a reversing valve;
the heating method comprises the following steps:
acquiring detection data of a vehicle, wherein the detection data comprises the temperature of a battery pack and the SOC of a battery;
when the temperature of the battery pack is lower than the proper working temperature and the SOC of the battery is less than 80 percent,
starting an engine, and controlling the engine heat dissipation loop to be connected to the liquid cooling plate by using the reversing valve;
when the temperature of the battery pack is lower than the proper working temperature and the SOC of the battery is more than or equal to 80 percent,
and starting the motor, and controlling the motor and the electric control heat dissipation loop to be connected to the liquid cooling plate by utilizing the reversing valve.
Preferably, the detection data further includes a temperature of the liquid-cooled panel;
the specific steps of using the reversing valve include: and starting the reversing valve in a pulse mode, so that the cooling liquid in the motor heat dissipation loop or the motor and the electric control heat dissipation loop discontinuously flows into the liquid cooling plate, and the temperature of the liquid cooling plate is controlled not to be higher than the proper working temperature of the battery pack.
According to the technical scheme, the first cooling liquid in the engine heat dissipation loop can be used for collecting the waste heat of the engine, or the second cooling liquid in the motor and the electric control heat dissipation loop is used for collecting the waste heat of the motor and the electric control element, the first cooling liquid or the second cooling liquid can directly enter the liquid cooling plate to heat the battery cell in the battery pack, the utilization rate of the waste heat is high, the energy consumption of the whole vehicle can be effectively reduced, and the endurance mileage is improved.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of a liquid-cooled panel;
in the figure, a box body 1, a liquid cooling plate 2, a second cavity 21, a first cavity 22, a first pipeline 3, a PTC heating device 4, a reversing valve 5, a motor and electronic control heat dissipation loop 6, an engine heat dissipation loop 7, a vehicle-mounted air conditioner loop 8, an external heat dissipation loop 9, a water pump 10, an external radiator 11 and a battery cell 12.
Detailed Description
The following is further detailed by the specific embodiments:
as shown in fig. 1, the present embodiment provides a thermal management system for a battery pack, which includes a battery pack heating circuit and a battery pack heat dissipation circuit, wherein the heating circuit heats the battery pack through a liquid cooling plate 2 having two channels, and the heat dissipation circuit dissipates heat to the battery pack through the liquid cooling plate 2 having two channels.
In the present embodiment, the liquid cooling plate 2 includes a first chamber 22 and a second chamber 21 which are independent from each other; the liquid cooling plate 2 is preferably a harmonica tube, and a part of the harmonica tube channels in the liquid cooling plate 2 are second cavities 21; another part of the channels of the harmonica line in the liquid-cooled plate 2 are first cavities 22. As shown in fig. 2, in the embodiment, the plurality of harmonica pipe passages in the middle of the liquid cooling plate 2 are the second cavities 21, and the plurality of harmonica pipe passages on two sides of the liquid cooling plate 2 are the first cavities 22, that is, the first cavities 22 are located on two sides of the second cavities 21, and the first cavities 22 are not communicated with the second cavities 21, so that the second cavities 21 and the first cavities 22 can be mutually independent, and the interference of media in the second cavities 21 and the first cavities 22 is avoided. It should be noted that, for the distribution form of the second cavity 21 and the first cavity 22, it is only necessary to ensure that the first cavity 22 and the second cavity 21 are independent from each other, and the distribution form is not limited by the structure of fig. 2.
In the box 1 of battery package is located to liquid cooling board 2 in this embodiment, and pastes and locate electric core 12 bottom, liquid cooling board 2 can be directly to electric core 12 heating or heat dissipation, can effectively guarantee the heat dissipation of electric core 12 or the efficiency of heating.
In this embodiment, the heating circuit includes an engine heat dissipation circuit 7 and an electric motor and electronic control heat dissipation circuit 6. The engine heat dissipation loop 7 is provided with a first cooling liquid for cooling the engine; the motor and the electric control heat dissipation loop 6 are provided with second cooling liquid for cooling the motor; the engine heat dissipation loop 7 and the motor and electronic control heat dissipation loop 6 are connected to the first cavity 22 through the reversing valve 5. The reversing valve 5 can selectively control the first cooling liquid or the second cooling liquid to flow into the first cavity 22, and the battery pack is heated by using the waste heat of the engine or the motor, so that the energy consumption of the automobile can be reduced, and the endurance mileage can be improved.
In this embodiment, two ends of the first cavity 22 are respectively connected to the port 1,2 of the reversing valve 5 through the first pipeline 3; the two ends of the motor and the electric control heat dissipation loop 6 are connected with a port 3,4 of the reversing valve 5; the two ends of the third loop are connected with a port 5,6 of the reversing valve 5.
Under the condition of normal operation, the 1,2 ports of the reversing valve 5 are communicated with each other, so that the first cooling liquid in the engine heat dissipation loop 7 and the second cooling liquid in the motor and electronic control heat dissipation loop 6 are prevented from influencing the temperature of the battery pack. The 3,4 ports of the reversing valve 5 are communicated with each other, so that the first cooling liquid can be ensured to circulate in the engine heat dissipation loop 7 to normally dissipate heat of the engine. The 5,6 ports of the reversing valve 5 are communicated with each other, so that the second cooling liquid is ensured to circulate in the motor and the electric control heat dissipation loop 6, and the motor and the electric control element are normally cooled.
When the temperature of the battery pack is lower than the proper working temperature, if the SOC of the battery is less than 80%, the engine is preferentially used for providing power for the automobile, the engine is started by the vehicle control module, the engine heat dissipation loop 7 collects heat generated by the engine, the temperature of first cooling liquid in the engine heat dissipation loop 7 is increased, when the temperature of the first cooling liquid reaches the condition of heating the battery pack, the vehicle control module controls the port 3 of the reversing valve 5 to be communicated with the port 1, and the port 4 of the reversing valve 5 to be communicated with the port 2. The first cooling liquid in the engine heat dissipation loop 7 can flow into the first cavity 22 through the first pipeline 3 to heat the battery core 12 in the battery pack, so that the battery pack is kept at an appropriate working temperature.
When the temperature of the battery pack is lower than the proper working temperature, if the SOC of the battery is more than or equal to 80%, the motor is preferentially used for providing power for the automobile, the vehicle control module controls the motor to be started, the motor and the electronic control heat dissipation loop 6 collect heat generated by the engine, so that the temperature of the second cooling liquid in the motor and the electronic control heat dissipation loop 6 is increased, when the temperature of the second cooling liquid reaches the condition of heating the battery pack, the vehicle control module controls the No. 5 port of the reversing valve 5 to be communicated with the No. 1 port, and the No. 6 port is communicated with the No. 2 port. Second cooling liquid in the motor and electronic control heat dissipation loop 6 can flow into the first cavity 22 through the first pipeline 3 to heat the battery core 12 in the battery pack, so that the battery pack is at an appropriate working temperature.
It should be noted that the suitable operating temperature of the battery pack in this embodiment is related to factors such as the structure and the model of the battery pack, and the suitable operating temperature of different battery packs is different, so the battery pack is subject to actual use.
In this embodiment, the engine heat dissipation loop 7, the motor and the electronic control heat dissipation loop 6 are conventional structures in an existing vehicle, and are not described herein any more, in this embodiment, the first coolant in the engine heat dissipation loop 7 can be used to collect the waste heat of the engine or the second coolant in the motor and the electronic control heat dissipation loop 6 can be used to collect the waste heat of the motor and the electronic control element, the first coolant or the second coolant can directly enter the liquid cooling plate 2 to heat the electric core 12 in the battery pack, the utilization rate of the waste heat is high, the energy consumption of the entire vehicle can be effectively reduced, and the cruising mileage is improved.
In this embodiment, because the heat generated by the engine and the motor during the operation is relatively high, the temperatures of the first coolant in the engine heat dissipation loop 7 and the second coolant in the motor and electronic control heat dissipation loop 6 are relatively high, and in some cases, the temperatures of the first coolant and the second coolant can reach 100 ℃, and if the first coolant or the second coolant is directly introduced into the first cavity 22, the battery cell 12 in the battery pack may be damaged. Therefore, in this embodiment, the reversing valve 5 is actuated in a pulse manner, so that the first cooling liquid or the second cooling liquid intermittently flows into the first cavity 22 through the first pipeline 3, and the first cooling liquid or the second cooling liquid neutralizes the cooling liquid retained in the first pipeline 3, thereby ensuring that the temperature of the cooling liquid flowing through the first cavity 22 is not higher than the proper working temperature of the battery pack. In some embodiments, the temperature in the first cavity 22 can be controlled below 60 ℃ in a pulsed manner, so that damage to the battery cell 12 caused by an excessively high temperature of the first cooling liquid or the second cooling liquid is avoided.
When the vehicle is in a low-temperature environment, the temperatures of the coolant in the engine heat dissipation loop 7 and the coolant in the motor and electronic control heat dissipation loop 6 are low, which results in a poor heating effect of the coolant in the first cavity 22 on the battery cell 12, and for this reason, the PTC heating device 4 is further disposed on the first pipeline 3, and the PTC heating device 4 can heat the coolant in the first pipeline 3, so as to ensure that the temperature of the battery cell 12 can reach an appropriate working temperature.
In the present embodiment, the heat dissipation circuit includes an in-vehicle air conditioning circuit 8 and an external heat dissipation circuit 9. The vehicle-mounted air conditioning loop 8 is communicated with the second cavity 21 of the liquid cooling plate 2, and a refrigerant in the vehicle air conditioner enters the box body 1 through the second cavity 21 to dissipate heat and cool the battery cell 12 in the box body 1. Compared with the traditional liquid cooling mode adopting a heat exchanger, the method for directly cooling the battery cell 12 by using the refrigerant can reduce heat loss and improve cooling efficiency.
In the embodiment, since the first cooling liquid, the second cooling liquid and the cooling medium all have a part of liquid remaining in the liquid-cooling plate 2 after flowing through the liquid-cooling plate 2, the first cooling liquid and the second cooling liquid can share the first cavity 22 of the liquid-cooling plate 2 because the first cooling liquid and the second cooling liquid have the same composition. The refrigerant is different from the first cooling liquid and the second cooling liquid in composition, and in order to avoid mixing of the refrigerant with the first cooling liquid and the second cooling liquid, an independent second cavity 21 is required to be arranged for the refrigerant to flow through.
In this embodiment, two ends of the external heat dissipation loop 9 are connected to ports 7,8 of the reversing valve 5, and in a normal state, the port 7 is communicated with the port 8; when an external cold source needs to be introduced, the vehicle control module controls the No. 7 port and the No. 1 port of the reversing valve 5 to be communicated, and the No. 8 port and the No. 2 port to be communicated. External heat dissipation loop 9 can introduce external cold source and get into first pipeline 3 in, utilizes external cold source to dispel the heat to the battery package, further guarantees the cooling effect of battery package. The external heat dissipation loop 9 is provided with a radiator and a water pump 10, and the water pump 10 is used for providing power for an external cold source.
The invention is not limited solely to that described in the specification and embodiments, and additional advantages and modifications will readily occur to those skilled in the art, so that the invention is not limited to the specific details, representative apparatus, and illustrative examples shown and described herein, without departing from the spirit and scope of the general concept as defined by the appended claims and their equivalents.

Claims (9)

1. A thermal management system for a battery pack, comprising:
an engine cooling circuit for cooling the engine;
the motor and the electric control heat dissipation loop are used for cooling the motor and the electric control element;
the liquid cooling plate is used for adjusting the temperature of the battery pack;
the engine heat dissipation loop, the motor and the electric control heat dissipation loop are connected to the liquid cooling plate through a reversing valve;
the liquid cooling plate comprises a first cavity and a second cavity which are mutually independent;
two ends of the first cavity are connected to the reversing valve through a first pipeline, and the engine heat dissipation loop, the motor and the electric control heat dissipation loop are communicated to the first cavity through the reversing valve;
the reversing valve is started in a pulse mode.
2. The thermal management system of a battery pack of claim 1, wherein: the thermal management system of the battery pack further comprises a vehicle-mounted air conditioning loop; the vehicle-mounted air conditioning loop is connected to the liquid cooling plate.
3. The battery pack thermal management system of claim 2, wherein: and two ends of the second cavity are communicated to the vehicle-mounted air conditioning loop.
4. The thermal management system of a battery pack of claim 3, wherein: the liquid cooling plate is a harmonica tube; a harmonica pipe channel in the middle of the liquid cooling plate is the second cavity; the harmonica pipe channels on two sides of the second cavity are the first cavity.
5. The thermal management system for a battery pack according to claim 3 or 4, wherein: and the first pipeline is provided with a PTC heating device.
6. The battery pack thermal management system of claim 5, wherein: the thermal management system of the battery pack further comprises an external heat dissipation loop; the external heat dissipation loop is communicated to the first cavity through the reversing valve.
7. The battery pack thermal management system of claim 6, wherein: two ends of the first cavity are respectively connected with a 1,2 port of the reversing valve through a first pipeline; the motor and the electric control heat dissipation loop are connected with a No. 4,5 port of the reversing valve; the engine heat dissipation loop is connected to a port 5,6 of the reversing valve; the external heat dissipation loop is connected to a port 7,8 of the reversing valve.
8. A method of heating a battery pack, the battery pack comprising the thermal management system of any of claims 1-7;
the heating method comprises the following steps:
acquiring detection data of a vehicle, wherein the detection data comprises the temperature of a battery pack and the SOC of a battery;
when the temperature of the battery pack is lower than the proper working temperature and the SOC of the battery is less than 80 percent,
starting an engine, and controlling the engine heat dissipation loop to be connected to the liquid cooling plate by using the reversing valve;
when the temperature of the battery pack is lower than the proper working temperature and the SOC of the battery is more than or equal to 80 percent,
and starting the motor, and controlling the motor and the electric control heat dissipation loop to be connected to the liquid cooling plate by utilizing the reversing valve.
9. The heating method according to claim 8, characterized in that: the detection data further comprises the temperature of the liquid cooling plate;
the specific steps of utilizing the reversing valve include: starting the reversing valve in a pulse mode;
the reversing valve enables cooling liquid in the motor heat dissipation loop or the motor and the electric control heat dissipation loop to discontinuously flow into the liquid cooling plate, and the temperature of the liquid cooling plate is controlled not to be higher than the proper working temperature of the battery pack.
CN202110259329.XA 2021-03-10 2021-03-10 Thermal management system and heating method of battery pack Active CN113097602B (en)

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Application Number Priority Date Filing Date Title
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CN113097602B true CN113097602B (en) 2022-11-29

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Publication number Priority date Publication date Assignee Title
US20100236846A1 (en) * 2009-03-20 2010-09-23 Dennis Kramer Battery pack with dual mode cooling scheme
CN106898841B (en) * 2017-03-07 2019-07-05 重庆长安汽车股份有限公司 Hybrid power automobile battery packet heat management system
CN111186341A (en) * 2020-03-09 2020-05-22 威马智慧出行科技（上海）有限公司 Motor drive and battery thermal management's integrated system and electric automobile
CN111546945A (en) * 2020-05-18 2020-08-18 东风小康汽车有限公司重庆分公司 Heating device and heating control method of power battery and range-extended electric vehicle

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