CN107394308B - System and method for charging and cooling vehicle battery - Google Patents

System and method for charging and cooling vehicle battery Download PDF

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Publication number
CN107394308B
CN107394308B CN201710585123.XA CN201710585123A CN107394308B CN 107394308 B CN107394308 B CN 107394308B CN 201710585123 A CN201710585123 A CN 201710585123A CN 107394308 B CN107394308 B CN 107394308B
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cooling
battery
temperature
change rate
loop
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CN107394308A (en
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符兴锋
唐湘波
李昌明
曾建宏
王军
姚伟浩
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Gac Aion New Energy Vehicle Co ltd
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Guangzhou Automobile Group Co Ltd
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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
    • H01M10/613—Cooling or keeping cold
    • 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
    • B60L58/26—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 cooling
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/482—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for several batteries or cells simultaneously or sequentially
    • 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
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
    • H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
    • 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
    • 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
    • H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
    • 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
    • H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
    • 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
    • H01M10/635—Control systems based on ambient temperature
    • 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
    • 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
    • H01M10/66—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
    • 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

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Secondary Cells (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention relates to a system and a method for charging and cooling a vehicle battery, wherein the system comprises: the temperature detection unit is used for acquiring the ambient temperature and the battery temperature in the battery charging process and obtaining the battery temperature change rate according to the battery temperature; the control unit is used for controlling the connection/disconnection of the first cooling circuit and the second cooling circuit according to the current environment temperature and the battery temperature change rate; the first cooling circuit cools the battery based on the flow of the cooling liquid in a conducting state; the second cooling loop cools the cooling liquid in the first cooling loop through an air conditioning refrigerant of a vehicle in a conducting state; the cooling condition is that the ambient temperature is greater than or equal to a set first temperature threshold value, and the change rate of the battery temperature is greater than or equal to a set change rate. The scheme of the invention can meet different heat dissipation requirements in the charging process of the vehicle battery.

Description

System and method for charging and cooling vehicle battery
Technical Field
The invention relates to the technical field of vehicles, in particular to a system and a method for charging and cooling a vehicle battery.
Background
The core problem that electric automobile faces is that the driving range is not enough and the charging setting configuration is not enough, fills electric pile fast and can solve electric automobile's vehicle battery charge refrigerated problem. However, under different battery temperatures, the charging capacity and the charging efficiency of the power battery are greatly different, the temperature of the rapidly-charged battery rises rapidly under a high-temperature environment, and if the temperature rise of the battery cannot be effectively controlled, the allowable charging capacity of the battery is reduced rapidly; if can not effectual reduction battery temperature, cause power battery to charge danger very easily on the one hand, on the other hand, battery charging efficiency descends, and quick charge's efficiency is influenced in the great extension of quick charge's time.
In order to solve the problem, the conventional method is to blow cold air of an air conditioner compressor into the battery pack to perform circulating flow so as to cool the batteries, however, when the battery pack contains a plurality of groups of batteries, the method has the problems of low cooling efficiency, uneven battery cooling effect and large temperature difference of the plurality of groups of batteries.
Disclosure of Invention
Based on the above, the embodiment of the invention provides a system and a method for charging and cooling a vehicle battery, which can enable the cooling effect of the battery to be more uniform and can also improve the cooling efficiency of the vehicle battery.
The invention provides a system for charging and cooling a vehicle battery, which comprises: the cooling system comprises a temperature detection unit, a control unit VCU, a first cooling loop and a second cooling loop;
the temperature detection unit is used for acquiring the ambient temperature and the battery temperature in the battery charging process and obtaining the battery temperature change rate according to the battery temperature;
the control unit is used for judging whether preset cooling conditions are met or not according to the current environment temperature and the battery temperature change rate; if yes, controlling the first cooling circuit and the second cooling circuit to be conducted; otherwise, detecting whether the current battery temperature change rate reaches a set change rate, and if so, controlling the first cooling loop to be conducted;
the first cooling circuit cools the battery based on the flow of the cooling liquid in a conducting state; the second cooling loop cools the cooling liquid in the first cooling loop through an air conditioning refrigerant of a vehicle in a conducting state;
the cooling condition is that the ambient temperature is greater than or equal to a set first temperature threshold value, and the change rate of the battery temperature is greater than or equal to a set change rate.
A method of vehicle battery charge cooling, comprising:
acquiring the ambient temperature and the battery temperature in the battery charging process, and obtaining the battery temperature change rate according to the battery temperature;
judging whether a preset cooling condition is met or not according to the current environment temperature and the battery temperature change rate; if yes, controlling the first cooling circuit and the second cooling circuit to be conducted; otherwise, detecting whether the current battery temperature change rate reaches a set change rate, and if so, controlling the first cooling loop to be conducted and the second cooling loop to be cut off;
wherein the battery is cooled based on the flow of the cooling liquid with the first cooling circuit turned on; under the condition of conducting the second cooling circuit, cooling the cooling liquid in the first cooling circuit through an air conditioning refrigerant of a vehicle;
the cooling condition is that the ambient temperature is greater than or equal to a set first temperature threshold value, and the change rate of the battery temperature is greater than or equal to a set change rate.
An apparatus for vehicle battery charge cooling, comprising:
the temperature detection module is used for acquiring the ambient temperature and the battery temperature in the battery charging process and obtaining the battery temperature change rate according to the battery temperature;
the cooling loop control module is used for judging whether preset cooling conditions are met or not according to the current environment temperature and the battery temperature change rate; if yes, controlling the first cooling circuit and the second cooling circuit to be conducted; otherwise, detecting whether the current battery temperature change rate reaches a set change rate, and if so, controlling the first cooling loop to be conducted and the second cooling loop to be cut off;
wherein the battery is cooled based on the flow of the cooling liquid with the first cooling circuit turned on; under the condition of conducting the second cooling circuit, cooling the cooling liquid in the first cooling circuit through an air conditioning refrigerant of a vehicle;
the cooling condition is that the ambient temperature is greater than or equal to a set first temperature threshold value, and the change rate of the battery temperature is greater than or equal to a set change rate.
A computer-readable storage medium having stored thereon a computer program which can be executed, the computer program, when executed, being capable of carrying out the steps of the method.
According to the technical scheme, in the battery charging process, whether a battery rapid cooling strategy is started or not can be comprehensively judged according to the current environment temperature and the battery temperature change rate; if yes, controlling the first cooling circuit and the second cooling circuit to be conducted; otherwise, whether the current battery temperature change rate reaches the set change rate or not is detected, if so, the first cooling loop is controlled to be conducted, the second cooling loop is controlled to be cut off, and the battery is cooled slowly through the conduction of the first cooling loop. The first cooling circuit cools the battery based on the flow of the cooling liquid in a conducting state; the second cooling loop cools the cooling liquid in the first cooling loop through the air conditioner refrigerant of the vehicle in the conduction state, so that the battery cooling effect can be more uniform under the two strategies, the efficiency of cooling the battery of the vehicle can be improved through the rapid cooling strategy, and different heat dissipation requirements of the battery of the electric vehicle under different environmental temperatures and battery temperature states in the charging process are met.
Drawings
FIG. 1 is a logical block diagram of a vehicle battery charge cooling system according to one embodiment;
FIG. 2 is a schematic diagram of an alternate embodiment of a vehicle battery charge cooling system;
FIG. 3 is a schematic flow diagram of a system for charging and cooling a vehicle battery according to an embodiment;
FIG. 4 is a schematic flow chart diagram of a method of vehicle battery charge cooling according to an embodiment;
fig. 5 is a schematic configuration diagram of an apparatus for charging and cooling a vehicle battery according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
FIG. 1 is a logical block diagram of a vehicle battery charge cooling system according to one embodiment; as shown in fig. 1, the system for charging and cooling a vehicle battery in the present embodiment includes: the cooling system comprises a temperature detection unit, a control unit, a first cooling circuit and a second cooling circuit; initially, both the first cooling circuit and the second cooling circuit are in an off state.
And the temperature detection unit is used for acquiring the ambient temperature and the battery temperature in the battery charging process and obtaining the battery temperature change rate according to the battery temperature.
The control unit is used for judging whether preset cooling conditions are met or not according to the current environment temperature and the battery temperature change rate in the battery charging process; if yes, controlling the first cooling circuit and the second cooling circuit to be conducted; otherwise, whether the current battery temperature change rate reaches the set change rate or not is detected, and if the current battery temperature change rate reaches the set change rate, the first cooling loop is controlled to be conducted. When the first cooling circuit and the second cooling circuit are both conducted, the efficiency of cooling the battery is higher than that in a state where only the first cooling circuit is conducted.
The first cooling circuit cools the battery based on the flow of the coolant in the on state. And the second cooling loop cools the cooling liquid in the first cooling loop through an air conditioning refrigerant of a vehicle in a conducting state.
The cooling condition is that the ambient temperature is greater than or equal to a set first temperature threshold value, and the change rate of the battery temperature is greater than or equal to a set change rate. For example: the ambient temperature is more than or equal to 40 ℃, and the temperature rise exceeds 3 ℃ within 5 seconds of the temperature change rate of the battery. In general, the charging efficiency of a battery of a vehicle is different in different temperature states, for example, as shown in table 1.
Table 1:
＜-10℃ without charging
-10～0℃ Filling for 10 hours
0～15℃ Filling for 5 hours
15～25℃ 2 hours full of
25～45℃ Filling for 1 hour
45～50℃ Filling for 5 hours
50～60℃ Filling for 10 hours
＞60℃ Without charging
Therefore, when the temperature of the battery exceeds a certain temperature value, the charging time is prolonged, the charging efficiency is reduced, and even the battery cannot be charged. The different batteries are affected by temperature to different extents, and thus, the preset cooling condition may be set according to different battery performances.
The vehicle battery charging and cooling system is suitable for the quick charging mode of the battery and the normal charging mode of the battery, can meet different heat dissipation requirements of the battery under various charging environments, is even in cooling effect, is beneficial to preventing the temperature of the battery from being too high, and improves the charging efficiency of the battery.
In an optional embodiment, the system for charging and cooling a vehicle battery further comprises: and the cooling liquid detection unit is used for detecting the pressure and the flow rate of the cooling liquid in the first cooling circuit. The control unit is further used for calculating the target pressure and the target flow rate of the cooling liquid in the first cooling loop according to the current battery temperature, the current pressure and the current flow rate of the cooling liquid after the first cooling loop is conducted; and adjusting the circulation pressure and flow rate of the cooling liquid in the first cooling circuit according to the target pressure and the target flow rate. Therefore, the time required for cooling the battery can be adjusted, for example, the flow rate of the cooling liquid is increased, and the time required for cooling the battery can be shortened.
In an optional embodiment, the system for charging and cooling a vehicle battery further comprises: and the battery management unit is used for detecting the battery voltage and judging whether the battery charging is finished or not according to the battery voltage. Correspondingly, the control unit is also used for controlling the second cooling circuit to be cut off or controlling the first cooling circuit and the second cooling circuit to be cut off when the charging of the battery is finished. If only the second cooling circuit is cut off, the battery can be continuously cooled by the first cooling circuit, and when the battery cooling is no longer needed, both the first cooling circuit and the second cooling circuit can be controlled to be cut off.
In another optional embodiment, the control unit may be further configured to start a timer when the battery charging is finished, and control the first cooling circuit and the second cooling circuit to be cut off only when a set clock of the timer expires. That is, when the battery charging is just finished, the battery temperature is still higher than the normal temperature, and the battery temperature can be quickly returned to the normal state in the embodiment.
In an optional embodiment, the battery management unit is further configured to detect a charging current, and determine whether to start a fast charging mode according to the charging current. For example, when the charging current is greater than the set current threshold, the fast charging mode is started, otherwise, the normal charging mode is started.
Correspondingly, the control unit may be further configured to control the on/off of the first cooling circuit and the second cooling circuit according to the battery temperature change rate if the current charging mode of the battery is the fast charging mode, and determine whether the preset cooling condition is satisfied according to the current ambient temperature and the battery temperature change rate if the current charging mode of the battery is not the fast charging mode. Specific examples thereof include: if the battery temperature is in the quick charging mode, the control unit detects whether the current battery temperature change rate reaches a set change rate; and if so, immediately controlling the first cooling circuit and the second cooling circuit to be conducted, and entering a fast cooling mode for the battery. Because charging current is great under the mode of filling soon, the battery temperature rise is showing, consequently need start quick cooling strategy, cool down the battery through first cooling circuit and second cooling circuit simultaneously promptly to guarantee that the battery can cool off fast. It can be understood that, in the fast charge mode, when the change rate of the battery temperature does not reach the set change rate, the first cooling circuit can be controlled to be conducted, the second cooling circuit can be controlled to be cut off, and the first cooling circuit and the second cooling circuit can be controlled to be cut off. On the other hand, if the charging mode is the common charging mode, judging whether the preset cooling condition is met or not according to the current environment temperature and the battery temperature change rate; if yes, controlling the first cooling circuit and the second cooling circuit to be conducted; otherwise, when the current battery temperature change rate is detected to reach the set change rate, the first cooling loop is controlled to be conducted, and the second cooling loop is controlled to be cut off. Under the ordinary mode of charging, the battery temperature rise is slower, consequently combines ambient temperature to judge whether need start the quick cooling strategy. Therefore, different battery cooling requirements under different charging environments and different charging modes can be realized.
As shown in table 1, when the battery temperature is lower than a certain temperature, the charging efficiency is low, and even charging is impossible. Based on this, in an optional embodiment, the system for charging and cooling a vehicle battery further includes: a heating device that warms the coolant in the first cooling loop when activated. Correspondingly, the control unit can be further configured to detect whether the current ambient temperature is lower than a set second temperature threshold value in the battery charging process, and if the current ambient temperature is lower than the set second temperature threshold value, control the first cooling circuit to be turned on and the second cooling circuit to be turned off, and start the heating device to heat the cooling liquid in the first cooling circuit, so that the battery temperature is maintained in a preset temperature range, and thus the problem of low battery charging efficiency in a low-temperature environment can be solved. Wherein the second temperature threshold is less than the first temperature threshold, e.g. 0 ℃. Currently, other temperature values may also be set depending on the performance of the battery.
The vehicle battery charging and cooling system based on the embodiment can meet different battery cooling requirements in different charging modes (a quick charging mode and a common charging mode), and can also realize the temperature rise of the battery in a low-temperature environment, so that the charging of the battery at a proper temperature is further ensured, and the charging efficiency is improved.
In an optional embodiment, the temperature detection unit includes: a first water temperature sensor (water temperature sensor 1 in fig. 2), a second water temperature sensor (water temperature sensor 2 in fig. 2), and an ambient temperature sensor. The first water temperature sensor is used for detecting a first water temperature of cooling liquid entering the battery box body, and the second water temperature sensor is used for detecting a second water temperature of the cooling liquid flowing out of the battery box body; the environment temperature sensor is used for detecting the environment temperature in the battery charging process; the battery temperature is derived from the first water temperature and the second water temperature.
In an alternative embodiment, the first and second cooling circuits may be configured as described with reference to FIG. 2. Wherein the first cooling circuit is a black solid line identified circuit comprising: electric water pump, electronic three-way valve, battery radiator, expansion tank and liquid-liquid heat exchanger. An inlet of the electric three-way valve is connected with a water outlet of the battery box body, a first outlet of the electric three-way valve is connected with a first inlet of the liquid-liquid heat exchanger, and a second outlet of the electric three-way valve is connected with an inlet of the battery radiator; the outlet of the battery radiator is connected with the inlet of the expansion tank, the outlet of the expansion tank and the first outlet of the liquid-liquid heat exchanger are both connected with the water inlet of the electric water pump, and the water outlet of the electric water pump is connected with the water inlet of the battery box body. The electric water pump is used for driving cooling liquid of the cooling loop to flow, and the expansion tank is used for supplementing the cooling liquid and maintaining certain loop pressure.
If air is mixed into the pipe of the first cooling circuit, the normal flow of the cooling liquid is affected, and the cooling effect is affected. In this regard, in an alternative embodiment, the first cooling circuit further includes a deaeration valve for promptly discharging air from the first cooling circuit.
Based on above-mentioned first cooling circuit, the concrete accessible of control unit is controlled electric three-way valve realizes switching on and cutting off of first cooling circuit, through control electric water pump realizes adjusting the velocity of flow of the coolant liquid that gets into the battery box, through control the expansion tank realizes adjusting the pressure of the coolant liquid in the first cooling circuit.
The second cooling circuit is a circuit identified by a grey solid line, comprising: the air conditioner comprises an air conditioner compressor, an air conditioner condenser, an evaporator, a switch piece, a first expansion valve and a second expansion valve. The outlet of the air-conditioning compressor is connected with the inlet of the air-conditioning condenser, the outlet of the air-conditioning condenser is connected with the inlet of the evaporator through the first expansion valve, the outlet of the air-conditioning condenser is also connected with the second inlet of the liquid-liquid heat exchanger through the switch piece and the second expansion valve in sequence, and the outlet of the evaporator and the second outlet of the liquid-liquid heat exchanger are both connected with the inlet of the air-conditioning compressor. The liquid-liquid exchanger is used for realizing the rapid cooling of the air-conditioning refrigerant to the cooling liquid, the switch part is used for realizing the conduction and the cut-off of the second cooling loop, and the expansion valve controls the flow of the valve through the change of the superheat degree at the tail end of the evaporator, thereby preventing the insufficient utilization of the area of the evaporator and the phenomenon of knocking the cylinder.
Based on the second cooling circuit, the control unit can specifically control the switch element to realize the conduction and the disconnection of the second cooling circuit. Alternatively, the switch member may be a solenoid valve or other device having a similar circuit switching function.
In an alternative embodiment, the heating device is a heater, and the position of the heater is as shown in fig. 2, that is, the first outlet of the electric three-way valve is connected with the first inlet of the liquid-liquid heat exchanger through the heater, and directly acts on the cooling liquid in the liquid-liquid heat exchanger, so that the cooling liquid in the first cooling circuit is heated, and the temperature of the battery is prevented from being lower than the set temperature threshold.
Alternatively, the control unit in the system for charging and cooling the Vehicle battery of the above embodiment may be a Vehicle Control Unit (VCU), and only a corresponding control logic needs to be set in the existing Vehicle control unit, which is convenient for implementation.
Further, the system for charging and cooling a vehicle battery based on the above embodiment, which implements the temperature control during the battery charging process as shown in fig. 3, may include the following processes:
and S301, accessing the charging pile in a key-off state. Present electric automobile carries out battery charging under the key of closing generally, therefore still can detect whether current is the key of closing state, if, allows to insert and fills electric pile.
S302, awakening the VCU, the battery management system BMS and the temperature detection unit.
The battery management system detects the current charging current, when the charging current is larger than a certain current value, the quick charging mode of the battery is started, otherwise, the common charging mode of the battery is started.
The temperature detection unit acquires the ambient temperature and the battery temperature in the battery charging process, and obtains the battery temperature change rate according to the battery temperature; and sending the ambient temperature, the battery temperature and the battery temperature change rate to the VCU.
S303, the VCU determines whether the current charging mode of the battery is the fast charging mode, if so, executes the process S304, otherwise, executes the process S305;
s304, the VCU judges and detects whether the current battery temperature change rate reaches the set change rate, if so, the flow is executed in the step S306, otherwise, the step S307 is executed.
Wherein, the change rate is set as follows: the temperature of the battery rises more than 3 ℃ within 5 seconds.
S305, the VCU determines whether a cooling condition (i.e. a rapid cooling condition) is satisfied according to the current ambient temperature and the battery temperature change rate, if so, executes the process S306, otherwise, executes the process S307.
The cooling condition is that the ambient temperature is greater than or equal to a set first temperature threshold (for example, 40 ℃) and the battery temperature change rate is greater than or equal to a set change rate (for example, the battery temperature rises over 3 ℃) within 5 seconds.
S306, awakening the gateway, the air conditioner compressor and the electric water pump, and controlling the conduction of the first cooling loop and the second cooling loop so as to rapidly cool the battery.
And S307, awakening the gateway and the electric water pump, controlling the first cooling loop to be conducted, and controlling the second cooling loop to be cut off, so as to slowly cool the battery.
In addition, the battery management system also detects the battery voltage and judges whether the battery charging is finished or not according to the battery voltage. And if the charging of the battery is finished, the VCU controls the second cooling circuit to be cut off, or controls the first cooling circuit and the second cooling circuit to be cut off.
Specifically, a target pressure and a target flow rate of the coolant in the first cooling circuit may be determined based on the current battery temperature, the pressure and the flow rate of the coolant; and adjusting the circulation pressure and flow rate of the cooling liquid in the first cooling circuit according to the target pressure and the target flow rate, thereby adjusting the period of time required for cooling the battery.
Based on the vehicle battery charging and cooling system of the embodiment, the heat dissipation requirement of the battery is met under various environment temperatures in the battery quick charging process or the common charging process, particularly, the quick charging is carried out under the condition of higher environment temperature, the vehicle battery charging and cooling system has a good cooling effect, the battery charging environment temperature range is expanded, and the battery charging efficiency is improved.
FIG. 4 is a schematic flow chart diagram of a method of vehicle battery charge cooling according to an embodiment. As shown in fig. 4, the method for cooling the vehicle battery includes the steps of:
s401, acquiring the ambient temperature and the battery temperature in the battery charging process, and obtaining the battery temperature change rate according to the battery temperature;
s402, judging whether preset cooling conditions are met or not according to the current environment temperature and the battery temperature change rate; if yes, controlling the first cooling circuit and the second cooling circuit to be conducted; otherwise, whether the current battery temperature change rate reaches the set change rate or not is detected, and if the current battery temperature change rate reaches the set change rate, the first cooling loop is controlled to be conducted, and the second cooling loop is controlled to be cut off. The cooling condition is that the ambient temperature is greater than or equal to a set first temperature threshold value, and the change rate of the battery temperature is greater than or equal to a set change rate.
For example: the ambient temperature is more than or equal to 40 ℃, and the temperature rise exceeds 3 ℃ within 5 seconds of the temperature change rate of the battery. As shown in table 1, when the temperature of the battery exceeds a certain temperature, the charging time increases, the charging efficiency decreases, and even charging cannot be performed. The different batteries are affected by temperature to different extents, and thus the preset cooling condition can be set according to different battery performances.
Wherein the first cooling circuit cools the battery based on the flow of the cooling liquid in a conducting state; and the second cooling loop cools the cooling liquid in the first cooling loop through an air conditioning refrigerant of a vehicle in a conducting state.
It is understood that the main body of the execution of the above steps in this embodiment may be the control unit in the above system embodiment.
In an optional embodiment, before determining whether the preset cooling condition is satisfied according to the current ambient temperature and the battery temperature change rate, the method may further include: judging whether the current charging mode of the battery is a quick charging mode; if the battery is in the quick charging mode, controlling the connection/disconnection of the first cooling loop and the second cooling loop according to the change rate of the temperature of the battery; and if the battery is not in the quick charging mode, judging whether the preset cooling condition is met according to the current environment temperature and the battery temperature change rate. The controlling of the on/off of the first cooling circuit and the second cooling circuit according to the rate of change of the battery temperature includes: and detecting whether the change rate of the temperature of the battery reaches a set change rate, controlling the first cooling circuit and the second cooling circuit to be conducted if the change rate of the temperature of the battery does not reach the set change rate, and controlling the first cooling circuit to be conducted and the second cooling circuit to be cut off or controlling the first cooling circuit and the second cooling circuit to be cut off if the change rate of the temperature of the battery does not reach the set change rate. Detailed description of the preferred embodimentsthe foregoing description of the embodiment of figure 3 may be referenced.
In an alternative embodiment, the method further comprises the steps of: detecting the pressure and flow rate of the cooling liquid in the first cooling circuit after the first cooling circuit is turned on; determining a target pressure and a target flow rate of the cooling liquid in the first cooling circuit according to the current battery temperature, the pressure and the flow rate of the cooling liquid; and adjusting the circulation pressure and flow rate of the cooling liquid in the first cooling circuit according to the target pressure and the target flow rate.
In an optional embodiment, after obtaining the ambient temperature and the battery temperature during the battery charging process, the method further comprises the following steps: detecting whether the current environment temperature is lower than a set second temperature threshold value, if so, controlling the first cooling loop to be conducted and the second cooling loop to be cut off, and starting a preset heating device; the heating device is capable of warming the coolant in the first cooling circuit in the activated state. Preferably, the second temperature threshold is less than the first temperature threshold.
In the cooling method of the embodiment, whether the battery rapid cooling strategy is started or not is comprehensively judged according to the current environment temperature and the battery temperature change rate in the battery charging process; if so, rapidly cooling the battery through the first cooling loop and the second cooling loop; otherwise, the battery is slowly cooled through the conduction of the first cooling loop. Therefore, the quick cooling requirement in the charging process of the vehicle battery can be met, and the slow cooling requirement in the charging process of the vehicle battery can also be met.
The present invention also provides a vehicle battery charge cooling apparatus, which can be used to perform the above-described vehicle battery charge cooling method, based on the same idea as the vehicle battery charge cooling method in the above-described embodiment. For convenience of illustration, only the parts related to the embodiments of the present invention are shown in the schematic structural diagrams of the embodiments of the vehicle battery charging and cooling device, and those skilled in the art will understand that the illustrated structure does not constitute a limitation of the device, and may include more or less components than those illustrated, or combine some components, or arrange different components.
FIG. 5 is a schematic structural view of an apparatus for charging and cooling a vehicle battery according to an embodiment of the present invention; as shown in fig. 5, the apparatus for charging and cooling a vehicle battery of the present embodiment includes:
the temperature detection module 501 is configured to obtain an ambient temperature and a battery temperature during a battery charging process, and obtain a battery temperature change rate according to the battery temperature;
a cooling loop control module 502, configured to determine whether a preset cooling condition is met according to the current ambient temperature and the battery temperature change rate; if yes, controlling the first cooling circuit and the second cooling circuit to be conducted; otherwise, detecting whether the current battery temperature change rate reaches a set change rate, and if so, controlling the first cooling loop to be conducted and the second cooling loop to be cut off;
wherein the first cooling circuit cools the battery based on the flow of the cooling liquid in a conducting state; the second cooling loop cools the cooling liquid in the first cooling loop through an air conditioning refrigerant of a vehicle in a conducting state;
judging whether a preset cooling condition is met or not according to the current environment temperature and the battery temperature change rate; if yes, controlling the first cooling circuit and the second cooling circuit to be conducted; otherwise, whether the current battery temperature change rate reaches the set change rate or not is detected, and if the current battery temperature change rate reaches the set change rate, the first cooling loop is controlled to be conducted, and the second cooling loop is controlled to be cut off.
In an optional embodiment, the cooling loop control module 502 is further configured to determine whether the current charging mode of the battery is the fast charging mode before determining whether the preset cooling condition is met according to the current ambient temperature and the change rate of the battery temperature; if the battery is in the quick charging mode, controlling the connection/disconnection of the first cooling loop and the second cooling loop according to the change rate of the temperature of the battery; and if the battery is not in the quick charging mode, judging whether the preset cooling condition is met according to the current environment temperature and the battery temperature change rate.
The controlling of the on/off of the first cooling circuit and the second cooling circuit according to the rate of change of the battery temperature includes: and detecting whether the change rate of the temperature of the battery reaches a set change rate, controlling the first cooling circuit and the second cooling circuit to be conducted if the change rate of the temperature of the battery does not reach the set change rate, and controlling the first cooling circuit to be conducted and the second cooling circuit to be cut off or controlling the first cooling circuit and the second cooling circuit to be cut off if the change rate of the temperature of the battery does not reach the set change rate.
In an alternative embodiment, the cooling circuit control module 502 is further configured to determine a target pressure and a target flow rate of the cooling fluid in the first cooling circuit after the first cooling circuit is turned on according to the current battery temperature, the current pressure and flow rate of the cooling fluid in the first cooling circuit; and adjusting the circulation pressure and flow rate of the cooling liquid in the first cooling circuit according to the target pressure and the target flow rate.
In an optional embodiment, the cooling circuit control module 502 is further configured to detect whether the current ambient temperature is lower than a set second temperature threshold, and if so, control the first cooling circuit to be turned on, control the second cooling circuit to be turned off, and start a preset heating device; the heating device is capable of warming the coolant in the first cooling circuit in the activated state.
It is to be understood that the apparatus for charging and cooling a vehicle battery of the above-described embodiment is applicable to the control unit in the above-described system embodiment.
It should be noted that, in the embodiment of the vehicle battery charging and cooling apparatus of the above example, since the contents of information interaction, execution process, and the like between the modules are based on the same concept as the foregoing method embodiment of the present invention, the technical effect brought by the contents is the same as the foregoing method embodiment of the present invention, and specific contents may refer to the description in the method embodiment of the present invention, and are not described again here.
In addition, in the above-described exemplary embodiment of the vehicle battery charging and cooling device, the logical division of the program modules is only an example, and in practical applications, the above-described function distribution may be performed by different program modules according to needs, for example, due to configuration requirements of corresponding hardware or due to convenience of implementation of software, that is, the internal structure of the vehicle battery charging and cooling device is divided into different program modules to perform all or part of the above-described functions.
It will be understood by those skilled in the art that all or part of the processes of the method for cooling and charging a vehicle battery of the above embodiments may be implemented by a computer program that can be stored in a computer readable storage medium and sold or used as a stand-alone product. The program, when executed, may perform all or a portion of the steps of the embodiments of the methods described above. In addition, the storage medium may be provided in a computer device, and the computer device further includes a processor, and when the processor executes the program in the storage medium, all or part of the steps of the embodiments of the methods described above can be implemented. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments. It will be understood that the terms "first," "second," and the like as used herein are used herein to distinguish one object from another, but the objects are not limited by these terms.
The above-described examples merely represent several embodiments of the present invention and should not be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. A system for charging and cooling a vehicle battery, comprising: the cooling system comprises a temperature detection unit, a control unit, a first cooling circuit and a second cooling circuit;
the temperature detection unit is used for acquiring the ambient temperature and the battery temperature in the battery charging process and obtaining the battery temperature change rate according to the battery temperature;
the control unit is used for judging whether preset cooling conditions are met or not according to the current environment temperature and the battery temperature change rate; if yes, controlling the first cooling circuit and the second cooling circuit to be conducted; otherwise, detecting whether the current battery temperature change rate reaches a set change rate, and if so, controlling the first cooling loop to be conducted and the second cooling loop to be cut off;
the first cooling circuit cools the battery based on the flow of the cooling liquid in a conducting state; the second cooling loop cools the cooling liquid in the first cooling loop through an air conditioning refrigerant of a vehicle in a conducting state; when the first cooling loop and the second cooling loop are conducted, the efficiency of cooling the battery is higher than that of the state that only the first cooling loop is conducted;
the cooling condition is that the ambient temperature is greater than or equal to a set first temperature threshold value, and the change rate of the battery temperature is greater than or equal to a set change rate;
the system for charging and cooling a vehicle battery further includes: the heating device heats the cooling liquid in the first cooling loop when being started;
the control unit is further used for detecting whether the current ambient temperature is lower than a set second temperature threshold value or not in the battery charging process, if so, controlling the first cooling loop to be conducted and the second cooling loop to be cut off, and starting the heating device;
wherein the first cooling circuit comprises: the system comprises an electric water pump, an electric three-way valve, a battery radiator, an expansion tank and a liquid-liquid heat exchanger; an inlet of the electric three-way valve is connected with a water outlet of the battery box body, a first outlet of the electric three-way valve is connected with a first inlet of the liquid-liquid heat exchanger, and a second outlet of the electric three-way valve is connected with an inlet of the battery radiator; the outlet of the battery radiator is connected with the inlet of an expansion tank, the outlet of the expansion tank and the first outlet of the liquid-liquid heat exchanger are both connected with the water inlet of an electric water pump, and the water outlet of the electric water pump is connected with the water inlet of a battery box body; the first outlet of the electric three-way valve is connected with the first inlet of the liquid-liquid heat exchanger through a heating device;
the control unit controls the electric three-way valve to realize the conduction/cutoff of the first cooling loop, controls the electric water pump to adjust the flow rate of the cooling liquid entering the battery box body, and controls the expansion tank to adjust the pressure of the cooling liquid in the first cooling loop;
the second cooling circuit includes: the air conditioner comprises an air conditioner compressor, an air conditioner condenser, an evaporator, a switch piece, a first expansion valve and a second expansion valve; the outlet of the air-conditioning compressor is connected with the inlet of the air-conditioning condenser, the outlet of the air-conditioning condenser is connected with the inlet of the evaporator through a first expansion valve, the outlet of the air-conditioning condenser is also connected with the second inlet of the liquid-liquid heat exchanger through a switch piece and a second expansion valve in sequence, and the outlet of the evaporator and the second outlet of the liquid-liquid heat exchanger are both connected with the inlet of the air-conditioning compressor;
the control unit controls the switch member to turn on/off the second cooling circuit.
2. The vehicle battery charge cooling system of claim 1, further comprising: the battery management unit is used for detecting charging current and judging whether to start a quick charging mode according to the charging current;
the control unit is further configured to control the on/off of the first cooling circuit and the second cooling circuit according to the battery temperature change rate if the current charging mode of the battery is the fast charging mode, and determine whether a preset cooling condition is met according to the current ambient temperature and the battery temperature change rate if the current charging mode of the battery is not the fast charging mode;
the controlling of the on/off of the first cooling circuit and the second cooling circuit according to the rate of change in the battery temperature includes: and detecting whether the change rate of the temperature of the battery reaches a set change rate, if so, controlling the first cooling loop and the second cooling loop to be conducted, and if not, controlling the first cooling loop to be conducted and the second cooling loop to be cut off, or controlling the first cooling loop and the second cooling loop to be cut off.
3. The system for vehicle battery charge cooling according to claim 1 or 2, characterized by further comprising: a coolant detection unit for detecting a pressure and a flow rate of the coolant in the first cooling circuit;
the control unit is further used for determining the target pressure and the target flow rate of the cooling liquid in the first cooling circuit according to the current battery temperature, the pressure and the flow rate of the cooling liquid after the first cooling circuit is conducted; and adjusting the circulation pressure and flow rate of the cooling liquid in the first cooling circuit according to the target pressure and the target flow rate.
4. A method of charge cooling a vehicle battery, applied to the system of charge cooling a vehicle battery according to any one of claims 1 to 3, the method comprising:
acquiring the ambient temperature and the battery temperature in the battery charging process, and obtaining the battery temperature change rate according to the battery temperature;
judging whether a preset cooling condition is met or not according to the current environment temperature and the battery temperature change rate; if yes, controlling the first cooling circuit and the second cooling circuit to be conducted; otherwise, detecting whether the current battery temperature change rate reaches a set change rate, and if so, controlling the first cooling loop to be conducted and the second cooling loop to be cut off;
wherein the battery is cooled based on the flow of the cooling liquid with the first cooling circuit turned on; under the condition of conducting the second cooling circuit, cooling the cooling liquid in the first cooling circuit through an air conditioning refrigerant of a vehicle; when the first cooling loop and the second cooling loop are conducted, the efficiency of cooling the battery is higher than that of the state that only the first cooling loop is conducted;
the cooling condition is that the ambient temperature is greater than or equal to a set first temperature threshold value, and the change rate of the battery temperature is greater than or equal to a set change rate;
after obtaining the ambient temperature and the battery temperature in the battery charging process, the method further comprises the following steps:
detecting whether the current environment temperature is lower than a set second temperature threshold value, if so, controlling the first cooling loop to be conducted and the second cooling loop to be cut off, and starting a preset heating device; the heating device is capable of warming the coolant in the first cooling circuit in the activated state.
5. The method for charging and cooling the vehicle battery according to claim 4, wherein before determining whether the preset cooling condition is satisfied according to the current ambient temperature and the battery temperature change rate, further comprising:
judging whether the current charging mode of the battery is a quick charging mode; if the battery is in the quick charging mode, controlling the connection/disconnection of the first cooling loop and the second cooling loop according to the change rate of the temperature of the battery; if the battery is not in the quick charging mode, judging whether the preset cooling condition is met or not according to the current environment temperature and the battery temperature change rate;
the controlling of the on/off of the first cooling circuit and the second cooling circuit according to the rate of change in the battery temperature includes: and detecting whether the change rate of the temperature of the battery reaches a set change rate, if so, controlling the first cooling loop and the second cooling loop to be conducted, and if not, controlling the first cooling loop to be conducted and the second cooling loop to be cut off, or controlling the first cooling loop and the second cooling loop to be cut off.
6. The method for charging and cooling a vehicle battery according to claim 4 or 5, further comprising the steps of:
detecting the pressure and flow rate of the cooling liquid in the first cooling circuit after the first cooling circuit is turned on;
determining a target pressure and a target flow rate of the cooling liquid in the first cooling circuit according to the current battery temperature, the pressure and the flow rate of the cooling liquid; and adjusting the circulation pressure and flow rate of the cooling liquid in the first cooling circuit according to the target pressure and the target flow rate.
7. A vehicular battery charge cooling apparatus applied to the vehicular battery charge cooling system according to any one of claims 1 to 3, the apparatus comprising:
the temperature detection module is used for acquiring the ambient temperature and the battery temperature in the battery charging process and obtaining the battery temperature change rate according to the battery temperature;
the cooling loop control module is used for judging whether preset cooling conditions are met or not according to the current environment temperature and the battery temperature change rate; if yes, controlling the first cooling circuit and the second cooling circuit to be conducted; otherwise, detecting whether the current battery temperature change rate reaches a set change rate, and if so, controlling the first cooling loop to be conducted and the second cooling loop to be cut off;
wherein the battery is cooled based on the flow of the cooling liquid with the first cooling circuit turned on; under the condition of conducting the second cooling circuit, cooling the cooling liquid in the first cooling circuit through an air conditioning refrigerant of a vehicle; when the first cooling loop and the second cooling loop are conducted, the efficiency of cooling the battery is higher than that of the state that only the first cooling loop is conducted;
the cooling condition is that the ambient temperature is greater than or equal to a set first temperature threshold value, and the change rate of the battery temperature is greater than or equal to a set change rate;
the cooling loop control module is further used for detecting whether the current environment temperature is lower than a set second temperature threshold value, if so, controlling the first cooling loop to be conducted and the second cooling loop to be cut off, and starting a preset heating device; the heating device is capable of warming the coolant in the first cooling circuit in the activated state.
8. The apparatus for charging and cooling a vehicle battery according to claim 7, wherein the cooling loop control module is further configured to determine whether the current charging mode of the battery is the fast charging mode before determining whether the preset cooling condition is satisfied according to the current ambient temperature and the battery temperature change rate; if the battery is in the quick charging mode, controlling the connection/disconnection of the first cooling loop and the second cooling loop according to the change rate of the temperature of the battery; if the battery is not in the quick charging mode, judging whether the preset cooling condition is met or not according to the current environment temperature and the battery temperature change rate;
the controlling of the on/off of the first cooling circuit and the second cooling circuit according to the rate of change in the battery temperature includes: and detecting whether the change rate of the temperature of the battery reaches a set change rate, if so, controlling the first cooling loop and the second cooling loop to be conducted, and if not, controlling the first cooling loop to be conducted and the second cooling loop to be cut off, or controlling the first cooling loop and the second cooling loop to be cut off.
9. The apparatus for charging and cooling a vehicle battery according to claim 7 or 8, wherein the cooling circuit control module is further configured to determine a target pressure and a target flow rate of the coolant in the first cooling circuit based on the current battery temperature, the current pressure and flow rate of the coolant in the first cooling circuit after the first cooling circuit is turned on; and adjusting the circulation pressure and flow rate of the cooling liquid in the first cooling circuit according to the target pressure and the target flow rate.
10. A computer-readable storage medium, having stored thereon a computer program executable to perform the steps of the method of any of claims 4 to 6.
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