CN110112507B - Thermal management device, power supply system and thermal management method - Google Patents
Thermal management device, power supply system and thermal management method Download PDFInfo
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- CN110112507B CN110112507B CN201910432109.5A CN201910432109A CN110112507B CN 110112507 B CN110112507 B CN 110112507B CN 201910432109 A CN201910432109 A CN 201910432109A CN 110112507 B CN110112507 B CN 110112507B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/07—Fire prevention, containment or extinguishing specially adapted for particular objects or places in vehicles, e.g. in road vehicles
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/36—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device
- A62C37/38—Control of fire-fighting equipment an actuating signal being generated by a sensor separate from an outlet device by both sensor and actuator, e.g. valve, being in the danger zone
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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
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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
- H01M10/62—Heating or cooling; Temperature control specially adapted for specific applications
- H01M10/625—Vehicles
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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
- H01M10/63—Control systems
- H01M10/635—Control systems based on ambient temperature
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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
- H01M10/65—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
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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
- H01M10/65—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
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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
- H01M10/65—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
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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
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
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- 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
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- General Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Business, Economics & Management (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
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- Automation & Control Theory (AREA)
- Battery Mounting, Suspending (AREA)
- Secondary Cells (AREA)
Abstract
The application provides a thermal management device, a power supply system and a thermal management method, and relates to the technical field of battery thermal management. The device comprises a containing assembly, a switch assembly, a control unit and a liquid cooling assembly provided with a liquid outlet switch. The accommodating assembly comprises a first accommodating space for storing cooling liquid and a second accommodating space for storing fire extinguishing agents. The switch assembly is arranged between the liquid cooling assembly and the accommodating assembly and used for controlling the opening or closing of a channel between the liquid cooling assembly and the accommodating assembly. The liquid cooling assembly is used for transmitting cooling liquid to control the temperature of the battery in the battery box body. The control unit is used for storing cooling liquid in the liquid cooling assembly to the first accommodating space by controlling the switch assembly when thermal runaway occurs, enabling the fire extinguishing agent in the second accommodating space to enter the liquid cooling assembly, and enabling the fire extinguishing agent to be in direct contact with the battery through the liquid outlet hole controlled by the liquid outlet switch. Therefore, the device can control the temperature of the battery and extinguish the fire when the heat is out of control.
Description
Technical Field
The application relates to the technical field of battery thermal management, in particular to a thermal management device, a power supply system and a thermal management method.
Background
The traditional fuel vehicle can discharge tail gas which pollutes the environment, and the tail gas discharge amount of the electric vehicle is little or even none, so that the electric vehicle is actively popularized and used. The electric vehicle mainly provides power for movement through a battery, and a lithium battery in the battery is widely used due to the characteristics of high voltage, large specific energy, long cycle life, low self-discharge rate and the like. In the electric vehicle, a plurality of lithium batteries can form a battery pack to provide power for the electric vehicle. However, lithium batteries generate heat during charging and discharging processes, and in addition, the density of the batteries is high, and in such a case, the batteries are prone to thermal runaway. If the thermal runaway cannot be dealt with in a timely manner, a greater accident (e.g., battery explosion) may be caused.
Disclosure of Invention
In order to overcome at least the above-mentioned deficiencies in the prior art, an object of the present application is to provide a thermal management device, a power supply system, and a thermal management method, which can control the temperature of a battery when thermal runaway does not occur, and extinguish a fire when thermal runaway occurs, without occupying a large space.
In a first aspect, an embodiment of the present application provides a thermal management device for thermally managing a battery pack, where the battery pack includes a battery box and a battery disposed in the battery box, the thermal management device includes a liquid cooling assembly, a receiving assembly, a switch assembly, and a control unit,
the accommodating assembly comprises a first accommodating space for storing cooling liquid and a second accommodating space for storing fire extinguishing agents;
the switch assembly is arranged between the liquid cooling assembly and the accommodating assembly and is used for controlling the opening or closing of a channel between the liquid cooling assembly and the accommodating assembly;
the liquid cooling assembly is arranged in the battery box body and used for controlling the temperature of the battery through transmission of cooling liquid, and a liquid outlet switch is arranged on the liquid cooling assembly;
the control unit is in communication connection with the switch assembly and used for controlling the switch assembly when thermal runaway occurs, storing cooling liquid in the liquid cooling assembly to the first accommodating space, enabling fire extinguishing agent in the second accommodating space to enter the liquid cooling assembly, and enabling the fire extinguishing agent to directly contact with the battery through a liquid outlet hole controlled by the liquid outlet switch on the liquid cooling assembly.
Optionally, in an embodiment of the present application, the accommodating assembly includes a first accommodating part and a second accommodating part, the first accommodating part includes the first accommodating space, the second accommodating part includes the second accommodating space, the switch assembly includes a first switch and a second switch,
the liquid cooling assembly is communicated with the first accommodating part to form a liquid cooling loop;
the first switch is arranged on the liquid cooling loop;
the second accommodating piece is communicated with the liquid cooling loop through the second switch, and the second switch is arranged between the second accommodating piece and the liquid cooling loop.
Optionally, in this embodiment, the liquid cooling assembly includes an inlet and an outlet,
the inlet and the outlet are communicated with the first accommodating part to form the liquid cooling loop;
the first switch is arranged between the inlet and the first accommodating part and is used for controlling the opening or closing of a channel between the inlet and the first accommodating part;
the second accommodating part is communicated with the first switch through a pipeline between the second switch and the inlet, wherein the second switch is used for controlling the opening or closing of a channel between the second accommodating part and the liquid cooling loop.
Optionally, in this embodiment, the thermal management device further comprises a water pump,
the water pump is arranged between the second switch and the inlet and used for accelerating the flow rate of the liquid fire extinguishing agent or the cooling liquid in the liquid cooling loop.
Optionally, in the embodiment of the present application, the thermal management device further comprises a temperature sensor,
the temperature sensor is arranged in the battery box body;
the control unit is in communication connection with the temperature sensor and is used for obtaining the temperature in the battery box body through the temperature sensor and judging that thermal runaway occurs when the temperature in the battery box body is higher than a preset temperature.
Optionally, in this application, the control unit is in communication connection with the first switch and the second switch, and is configured to control the first switch to be turned off when thermal runaway occurs, so that the coolant in the liquid cooling assembly is stored in the first accommodating part, and control the second switch to be turned on, so that the fire extinguishing agent in the second accommodating part enters the liquid cooling assembly without transferring the coolant, and is controlled by the liquid outlet switch to be in direct contact with the battery through the liquid outlet hole under the control of the liquid outlet hole.
Optionally, in this application embodiment, the liquid outlet switch is made of any one material of PP, PS, and ABS, wherein the melting point of this material is higher than the preset temperature, and the fire extinguishing agent directly contacts the battery through the liquid outlet hole after the liquid outlet switch melts.
Optionally, in this embodiment of the application, the first container includes an expansion kettle, the pressure inside the second container is greater than the standard atmospheric pressure, and the fire extinguishing agent is a gaseous fire extinguishing agent or a liquid fire extinguishing agent.
In a second aspect, the embodiment of the present application provides a power supply system, which includes a battery pack and the above thermal management device, where the thermal management device is configured to perform thermal management on the battery pack and extinguish a fire when thermal runaway occurs in the battery pack.
In a third aspect, an embodiment of the present application provides a thermal management method, which is applied to a control unit in a thermal management device, where the thermal management device is used for performing thermal management on a battery pack, the battery pack includes a battery box and a battery arranged in the battery box, the thermal management device further includes a liquid cooling assembly, a receiving assembly, a switch assembly and a temperature sensor, the receiving assembly includes a first receiving space for storing cooling liquid and a second receiving space for storing a fire extinguishing agent, the switch assembly is arranged between the liquid cooling assembly and the receiving assembly, the liquid cooling assembly and the temperature sensor are arranged in the battery box, a liquid outlet switch is arranged on the liquid cooling assembly, the control unit is in communication connection with the switch assembly and the temperature sensor, and the method includes:
receiving the temperature in the battery box body sent by the temperature sensor, and judging whether the temperature is greater than a preset temperature or not;
when the temperature is not higher than the preset temperature, sending a first control command to the switch assembly so that the cooling liquid in the first accommodating space enters the liquid cooling assembly and circulates between the liquid cooling assembly and the first accommodating space;
when the temperature is higher than the preset temperature, the situation of thermal runaway is judged, a second control command is sent to the switch assembly, so that the cooling liquid in the liquid cooling assembly is stored into the first accommodating space, the fire extinguishing agent in the second accommodating space enters the liquid cooling assembly without the transmission of the cooling liquid, and the fire extinguishing agent is in direct contact with the battery through the liquid outlet hole controlled by the liquid outlet switch.
Compared with the prior art, the method has the following beneficial effects:
the accommodating assembly comprises a first accommodating space for storing cooling liquid and a second accommodating space for storing fire extinguishing agents. The switch assembly is arranged between the liquid cooling assembly and the accommodating assembly and used for controlling the opening or closing of a channel between the liquid cooling assembly and the accommodating assembly. The liquid cooling assembly is used for transmitting cooling liquid to control the temperature of the battery in the battery box body. The control unit is used for storing cooling liquid in the liquid cooling assembly to the first accommodating space by controlling the switch assembly when thermal runaway occurs, enabling the fire extinguishing agent in the second accommodating space to enter the liquid cooling assembly, and enabling the fire extinguishing agent to be in direct contact with the battery through the liquid outlet hole controlled by the liquid outlet switch. From this, the device both can utilize the coolant liquid to carry out the control by temperature change to the battery, can utilize fire extinguishing agent to put out a fire simultaneously when thermal runaway to because the pipeline that uses when putting out a fire is for being used for originally carrying out the pipeline of control by temperature change, therefore the device can not newly increase other pipelines, just can not occupy great space yet.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a power supply system provided in an embodiment of the present application;
FIG. 2 is a block schematic diagram of a thermal management device according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a liquid cooling assembly according to an embodiment of the present disclosure;
FIG. 4 is a second block diagram of a thermal management device according to an embodiment of the present application;
fig. 5 is a schematic flowchart of a thermal management method according to an embodiment of the present application.
Icon: 10-a power supply system; 100-a thermal management device; 110-a liquid cooled assembly; 112-liquid outlet holes; 114-an inlet; 115-an outlet; 120-a containment assembly; 121-a first container; 122-a second receptacle; 130-a switch assembly; 131-a first switch; 132-a second switch; 140-a control unit; 150-a water pump; 160-temperature sensor; 170-a cooler; 180-a heater; 200-a battery pack; 210-a battery case; 220-battery.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a power supply system 10 according to an embodiment of the present disclosure. The power supply system 10 includes a thermal management device 100 and a battery pack 200. The thermal management device 100 is used to thermally manage the battery pack 200 by using a coolant and extinguish a fire by using a fire extinguishing agent when thermal runaway of the battery pack 200 occurs. During thermal management, the thermal management device 100 may be used for cooling or heating.
Referring to fig. 1 to fig. 3, fig. 2 is a block diagram of a thermal management apparatus 100 according to an embodiment of the present disclosure, and fig. 3 is a schematic structural diagram of a liquid cooling assembly 110 according to an embodiment of the present disclosure. The battery pack 200 includes a battery case 210 and a battery 220 disposed in the battery case 210. Alternatively, the battery 220 may be a lithium ion battery. The thermal management apparatus 100 includes a liquid cooling assembly 110, a receiving assembly 120, a switch assembly 130, and a control unit 140. The accommodating assembly 120 includes a first accommodating space for storing a cooling liquid and a second accommodating space for a fire extinguishing agent. The switch assembly 130 is disposed between the liquid cooling assembly 110 and the accommodating assembly 120, and is used for controlling opening or closing of a passage between the liquid cooling assembly 110 and the accommodating assembly 120. The liquid cooling assembly 110 is disposed in the battery case 210, and is configured to control the temperature of the battery 220 by transferring cooling liquid.
The control unit 140 is in communication connection with the switch assembly 130, and is configured to control the switch assembly 130 when thermal runaway occurs, store the cooling liquid in the liquid cooling assembly 110 into the first accommodating space, and enable the fire extinguishing agent in the second accommodating space to enter the liquid cooling assembly 110. As shown in fig. 3, the liquid cooling module 110 is provided with a liquid outlet switch (not shown in fig. 3) and a liquid outlet 112 controlled by the liquid outlet switch, and when the liquid outlet 112 is in an open state, the internal space of the liquid cooling module 110 is communicated with the internal space of the battery box 210. Wherein, the number of the liquid outlet holes 112 is at least one. The fire extinguishing agent entering the liquid cooling assembly 110 can directly contact the battery 220 through the outlet hole 112 controlled by the outlet switch. From this, through same set of pipeline, both can realize the control by temperature change to battery package 200, can be when battery package 200 takes place thermal runaway simultaneously, change the coolant liquid in the pipeline for fire extinguishing agent to make fire extinguishing agent and battery 220 direct contact, in order to realize putting out a fire. The control unit 140 may be, but is not limited to, a BMS (Battery management System).
Referring to fig. 1 and 3 again, in the present embodiment, the accommodating component 120 may include a first accommodating part 121 and a second accommodating part 122, and the switch component 130 may include a first switch 131 and a second switch 132. The first receiving part 121 includes the first receiving space, and the second receiving part 122 includes the second receiving space. The liquid cooling assembly 110 is communicated with two ends of the first accommodating part 121 to form a liquid cooling loop. The liquid cooling loop is used for transmitting cooling liquid, and temperature control of the battery 220 is achieved. The first switch 131 is disposed on the liquid cooling circuit. The second accommodating member 122 is communicated with the liquid cooling loop through the second switch 132, and the second switch 132 is disposed between the second accommodating member 122 and the liquid cooling loop.
Further, the liquid cooling assembly 110 includes an inlet 114 and an outlet 115. The inlet 114 and the outlet 115 are communicated with the first accommodating part 121 to form the liquid cooling loop. The first switch 131 is disposed between the inlet 114 and the first accommodating part 121, and is used for controlling the opening or closing of a passage between the inlet 114 and the first accommodating part 121. The second receiving member 122 is communicated with the first switch 131 through the second switch 132 and the pipeline between the inlet 114. The second switch 132 is used for controlling the opening or closing of the passage between the second container 122 and the liquid cooling loop.
In the above arrangement, when the first switch 131 is turned on and the second switch 132 is turned off, the liquid cooling loop is a passage, the second accommodating member 122 is not connected to the liquid cooling loop, and at this time, the cooling liquid flows in the liquid cooling loop, so as to control the temperature of the battery pack 200. When the first switch 131 is turned off and the second switch 132 is turned off, the cooling liquid in the liquid cooling circuit enters the first container 121 for storage. When the first switch 131 is turned off and the second switch 132 is turned on, the fire extinguishing agent in the second container 122 enters the liquid cooling module 110, which is not transmitting the cooling liquid at this time, through the pipe of the liquid cooling loop, and directly contacts the battery 220 through the liquid outlet hole 112 controlled by the liquid outlet switch, so as to extinguish the fire.
Optionally, the accommodating component 120 may also be an accommodating device including two accommodating spaces, and each accommodating space corresponds to a switch, and whether the accommodating space is communicated with the liquid cooling component 110 can be controlled by the corresponding switch.
Optionally, referring to fig. 1 and fig. 4, fig. 4 is a second schematic block diagram of a thermal management device 100 according to an embodiment of the present application. The thermal management device 100 may also include a water pump 150, and the fire suppressant is a liquid fire suppressant. The water pump 150 is disposed between the second switch 132 and the inlet 114 for increasing the flow rate of the liquid fire-extinguishing agent in the liquid cooling circuit, thereby rapidly extinguishing the fire. If the water pump 150 is not needed, the control unit 140 may control the water pump 150 to be in a turn-off state. The water pump 150 may also be used to increase the flow rate of the coolant in the pipeline when thermal runaway does not occur, i.e., under normal operating conditions, so that the coolant circulates in the liquid cooling loop.
In this embodiment, the thermal management device 100 may further include a temperature sensor 160. The temperature sensor 160 may be disposed outside the battery case 210, or may be disposed inside the battery case 210. Preferably, the temperature sensor 160 is disposed in the battery case 210 for obtaining the temperature in the battery case 210. The control unit 140 is communicatively connected to the temperature sensor 160, and is configured to receive the temperature inside the battery box 210 sent by the temperature sensor 160, and compare the temperature with a preset temperature. When the temperature is higher than the preset temperature, it is determined that thermal runaway occurs in the battery pack 200. When the temperature is not higher than the preset temperature, it is determined that thermal runaway of the battery pack 200 does not occur.
The control unit 140 is in communication connection with the first switch 131 and the second switch 132, and the control unit 140 is configured to control the first switch 131 to be turned off when thermal runaway occurs, so that the cooling liquid in the liquid cooling assembly 110 is stored in the first container 121; and controlling the second switch 132 to switch, so that the fire extinguishing agent in the second container 122 enters the liquid cooling assembly 110 without transferring the cooling liquid, and directly contacts the battery 220 through the liquid outlet 112 under the control of the liquid outlet switch to the liquid outlet 112.
Optionally, in an implementation manner of this embodiment, the liquid outlet switch is a temperature-controlled switch, and when the temperature inside the battery box 210 is higher than the first temperature, the temperature-controlled switch is in an on state. The first temperature is greater than the preset temperature. Therefore, the coolant in the liquid cooling loop can be completely stored in the first accommodating space, and the temperature control switch is in an open state when the fire extinguishing agent in the second accommodating space enters the liquid cooling assembly 110, so that the fire extinguishing agent directly contacts the battery 220 through the liquid outlet 112.
Optionally, in another embodiment of this embodiment, the liquid outlet switch is an electronic water valve controlled by the control unit 140. When the control unit 140 determines that thermal runaway occurs, the liquid outlet switch can be controlled to be turned on after the first switch 131 is turned off and the second switch 132 is turned on. Alternatively, the control unit 140 may turn on the second switch 132 and the liquid outlet switch after the first switch 131 is turned off for a certain time or when the temperature in the battery box 210 obtained by the temperature sensor 160 is higher than a second temperature (the second temperature is higher than the preset temperature), so as to ensure that all the cooling liquid in the liquid cooling loop is stored in the first accommodating space when the fire extinguishing agent enters the liquid cooling assembly 110.
Optionally, in another embodiment of this embodiment, the liquid outlet switch is made of a material having a melting point within a preset temperature range. For example, the liquid outlet switch can be made of any one of PP (Polypropylene), PS (Polystyrene), ABS (Acrylonitrile Butadiene Styrene) with a melting point below 200 ℃. The material can be arranged in the liquid outlet hole 112 and is used for plugging the liquid outlet hole 112 when thermal runaway does not occur, namely under the normal working condition, and the direct contact of substances in the liquid cooling assembly 110 with the battery 220 through the liquid outlet hole 112 is avoided. The melting point of the material used is higher than the predetermined temperature. Through the arrangement, the liquid outlet holes 112 can be ensured to be in a closed state when the cooling liquid is used for temperature control; when the fire extinguishing agent is needed to extinguish a fire when thermal runaway occurs, after the cooling liquid in the liquid cooling loop is stored in the first accommodating space, the liquid outlet switch is melted, and the fire extinguishing agent can be directly contacted with the battery 220 through the liquid outlet hole 112. That is, in the present embodiment, when the control unit 140 determines that thermal runaway occurs, the liquid outlet switch does not melt, and as the temperature of the coolant stored in the first receiving space and in the battery box 210 further increases, the liquid outlet switch in a high temperature region in the battery box 210 melts, and the fire extinguishing agent flows out through the liquid outlet hole 112 where the melted liquid outlet switch is located, so that the fire extinguishing agent is sprayed to the high temperature region to extinguish fire. Wherein, the liquid outlet 112 is plural.
Optionally, the first container 121 comprises an expansion kettle. The pressure inside the second container 122 is greater than the standard atmospheric pressure, that is, the second container 122 is a high-pressure container, and the fire extinguishing agent inside the second container 122 is a fire extinguishing agent in a high-pressure state. With the second switch 132 open, the fire extinguishing agent in a high pressure state can directly enter the liquid cooling assembly 110 along the pipeline to directly contact the battery 220 through the outlet hole 112 in an open state. Optionally, the fire extinguishing agent is a gaseous fire extinguishing agent or a liquid fire extinguishing agent. For example, the fire extinguishing agent may be a foam fire extinguishing agent, 7150 fire extinguishing agent, carbon dioxide fire extinguishing agent, nitrogen fire extinguishing agent, halogenated alkane fire extinguishing agent, or the like.
Optionally, referring to fig. 1 and 3 again, the thermal management device 100 may further include a cooler 170 and a heater 180. The cooler 170 and the heater 180 are disposed between the water pump 150 and the inlet 114. The cooler 170 is configured to perform a heat dissipation process on the cooling fluid in the fluid cooling loop to reduce the temperature of the cooling fluid. Optionally, the cooler 170 may be an electronic device and is in communication connection with the control unit 140, and the control unit 140 may turn on the cooler 170 when the temperature of the battery pack 200 needs to be reduced; when the temperature reduction process for the battery pack 200 is not required, the cooler 170 is turned off.
The heater 180 is in communication connection with the control unit 140, and is configured to heat the cooling liquid in the liquid cooling loop under the control of the control unit 140, so as to increase the temperature of the environment where the battery 220 is located. In one embodiment of the present embodiment, the control unit 140 may turn off the cooler 170 and the heater 180 when thermal runaway occurs.
Referring to fig. 5, fig. 5 is a flowchart illustrating a thermal management method according to an embodiment of the present application. The method is applied to the control unit 140 in the thermal management device 100, and the thermal management device 100 is used for performing thermal management on the battery pack 200. The battery pack 200 includes a battery case 210 and a battery 220 disposed in the battery case 210. The thermal management device 100 further includes a liquid cooling assembly 110, a containment assembly 120, a switch assembly 130, and a temperature sensor 160. The receiving assembly 120 includes a first receiving space for storing a cooling liquid and a second receiving space for storing a fire extinguishing agent. The switch assembly 130 is disposed between the liquid cooling assembly 110 and the accommodating assembly 120, the liquid cooling assembly 110 and the temperature sensor 160 are disposed in the battery box 210, and the liquid cooling assembly 110 is provided with a liquid outlet switch. The control unit 140 is communicatively coupled to the switch assembly 130 and the temperature sensor 160. The flow of the thermal management method is described below.
Step S110, receiving the temperature in the battery box 210 sent by the temperature sensor 160, and determining whether the temperature is greater than a preset temperature.
And when the temperature is not greater than the preset temperature, executing step S120. And when the temperature is greater than the preset temperature, executing step S130.
Step S120, sending a first control command to the switch assembly 130, so that the cooling liquid in the first accommodating space enters the liquid cooling assembly 110, and circulates between the liquid cooling assembly 110 and the first accommodating space.
Step S130, determining that thermal runaway occurs, and sending a second control command to the switch assembly 130, so that the coolant in the liquid cooling assembly 110 is stored in the first accommodating space, and the fire extinguishing agent in the second accommodating space enters the liquid cooling assembly 110 that does not transmit the coolant, and directly contacts the battery 220 through the liquid outlet hole 112 controlled by the liquid outlet switch.
In this embodiment, the detailed description of the thermal management method may refer to the above description of the thermal management apparatus 100, and is not repeated herein.
In summary, the embodiments of the present application provide a thermal management device, a power supply system, and a thermal management method. The device comprises a containing assembly, a switch assembly, a control unit and a liquid cooling assembly provided with a liquid outlet switch. The accommodating assembly comprises a first accommodating space for storing cooling liquid and a second accommodating space for storing fire extinguishing agents. The switch assembly is arranged between the liquid cooling assembly and the accommodating assembly and used for controlling the opening or closing of a channel between the liquid cooling assembly and the accommodating assembly. The liquid cooling assembly is used for transmitting cooling liquid to control the temperature of the battery in the battery box body. The control unit is used for storing cooling liquid in the liquid cooling assembly to the first accommodating space by controlling the switch assembly when thermal runaway occurs, enabling the fire extinguishing agent in the second accommodating space to enter the liquid cooling assembly, and enabling the fire extinguishing agent to be in direct contact with the battery through the liquid outlet hole controlled by the liquid outlet switch. From this, the device both can utilize the coolant liquid to carry out the control by temperature change to the battery, can utilize fire extinguishing agent to put out a fire simultaneously when thermal runaway to because the pipeline that uses when putting out a fire is for originally being used for carrying out the pipeline of control by temperature change, therefore the device also can not occupy great space.
The above description is only for various embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and all such changes or substitutions are included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (8)
1. A heat management device is characterized in that the heat management device is used for carrying out heat management on a battery pack, the battery pack comprises a battery box body and a battery arranged in the battery box body, the heat management device comprises a liquid cooling assembly, an accommodating assembly, a switch assembly and a control unit,
the accommodating assembly comprises a first accommodating space for storing cooling liquid and a second accommodating space for storing fire extinguishing agents;
the switch assembly is arranged between the liquid cooling assembly and the accommodating assembly and is used for controlling the opening or closing of a channel between the liquid cooling assembly and the accommodating assembly;
the liquid cooling assembly is arranged in the battery box body and used for controlling the temperature of the battery through transmission of cooling liquid, and a liquid outlet switch is arranged on the liquid cooling assembly;
the control unit is in communication connection with the switch assembly and is used for controlling the switch assembly when thermal runaway occurs, storing cooling liquid in the liquid cooling assembly to the first accommodating space, enabling fire extinguishing agent in the second accommodating space to enter the liquid cooling assembly and directly contacting the battery through a liquid outlet hole controlled by the liquid outlet switch on the liquid cooling assembly;
wherein the accommodating component comprises a first accommodating part and a second accommodating part, the first accommodating part comprises the first accommodating space, the second accommodating part comprises the second accommodating space, the switch component comprises a first switch and a second switch,
the liquid cooling assembly is communicated with the first accommodating part to form a liquid cooling loop;
the first switch is arranged on the liquid cooling loop;
the second accommodating part is communicated with the liquid cooling loop through the second switch, the second switch is arranged between the second accommodating part and the liquid cooling loop, and the first switch is positioned between the first accommodating part and the communication position of the second switch and the liquid cooling loop;
the control unit is in communication connection with the first switch and the second switch and is used for controlling the first switch to be closed when thermal runaway occurs so that cooling liquid in the liquid cooling assembly is stored in the first accommodating piece, and controlling the second switch to be opened so that fire extinguishing agents in the second accommodating piece enter the liquid cooling assembly without the transmission of the cooling liquid, and the liquid outlet switch is controlled to discharge liquid holes, so that the liquid holes are in direct contact with the batteries.
2. The thermal management apparatus of claim 1, wherein said liquid cooling assembly comprises an inlet and an outlet,
the inlet and the outlet are communicated with the first accommodating part to form the liquid cooling loop;
the first switch is arranged between the inlet and the first accommodating part and is used for controlling the opening or closing of a channel between the inlet and the first accommodating part;
the second accommodating part is communicated with the first switch through a pipeline between the second switch and the inlet, wherein the second switch is used for controlling the opening or closing of a channel between the second accommodating part and the liquid cooling loop.
3. The thermal management device of claim 2, further comprising a water pump,
the water pump is arranged between the second switch and the inlet and used for accelerating the flow rate of the liquid fire extinguishing agent or the cooling liquid in the liquid cooling loop.
4. The thermal management device of claim 2 or 3, further comprising a temperature sensor,
the temperature sensor is arranged in the battery box body;
the control unit is in communication connection with the temperature sensor and is used for obtaining the temperature in the battery box body through the temperature sensor and judging that thermal runaway occurs when the temperature in the battery box body is higher than a preset temperature.
5. The heat management device according to claim 4, wherein the liquid outlet switch is made of any one material selected from PP, PS and ABS, wherein the melting point of the material is higher than the preset temperature, and the fire extinguishing agent directly contacts the battery through the liquid outlet hole after the liquid outlet switch is melted.
6. The thermal management device of claim 1, wherein the first container comprises an expansion kettle, the pressure inside the second container is greater than standard atmospheric pressure, and the fire extinguishing agent is a gaseous fire extinguishing agent or a liquid fire extinguishing agent.
7. A power supply system comprising a battery pack and the thermal management device of any one of claims 1 to 6, wherein the thermal management device is configured to thermally manage the battery pack and extinguish a fire when thermal runaway occurs in the battery pack.
8. The utility model provides a heat management method, its characterized in that is applied to the control unit in the heat management device, the heat management device is used for managing the heat to the battery package, the battery package includes battery box and sets up the battery in the battery box, the heat management device still includes liquid cooling subassembly, holding subassembly, switch module and temperature sensor, the holding subassembly is including the first accommodation space that is used for saving the coolant liquid and the second accommodation space that is used for saving fire extinguishing agent, the switch module sets up between the liquid cooling subassembly with the holding subassembly, liquid cooling subassembly and temperature sensor set up in the battery box, wherein, be provided with out the liquid switch on the liquid cooling subassembly, the control unit with switch module and temperature sensor communication connection, the method includes:
receiving the temperature in the battery box body sent by the temperature sensor, and judging whether the temperature is greater than a preset temperature or not;
when the temperature is not higher than the preset temperature, sending a first control command to the switch assembly so that the cooling liquid in the first accommodating space enters the liquid cooling assembly and circulates between the liquid cooling assembly and the first accommodating space;
when the temperature is higher than the preset temperature, judging that thermal runaway occurs, and sending a second control command to the switch assembly so as to enable the cooling liquid in the liquid cooling assembly to be stored into the first accommodating space, enable the fire extinguishing agent in the second accommodating space to enter the liquid cooling assembly without the transmission of the cooling liquid, and enable the fire extinguishing agent to directly contact the battery through a liquid outlet hole controlled by the liquid outlet switch;
the liquid cooling assembly is communicated with the first accommodating part to form a liquid cooling loop; the first switch is arranged on the liquid cooling loop; the second accommodating part is communicated with the liquid cooling loop through the second switch, the second switch is arranged between the second accommodating part and the liquid cooling loop, and the first switch is positioned between the first accommodating part and the communication position of the second switch and the liquid cooling loop; the control unit with first switch and second switch communication connection, the control unit to the switch module sends the second control command, so that the coolant liquid in the liquid cooling subassembly is saved to in the first accommodation space, and makes in the liquid cooling subassembly of fire extinguishing agent entering non-transmission coolant liquid in the second accommodation space, and through go out liquid hole that goes out liquid switch control with battery direct contact includes:
when thermal runaway occurs, the first switch is controlled to be closed, so that cooling liquid in the liquid cooling assembly is stored in the first accommodating piece, the second switch is controlled to be opened, so that fire extinguishing agents in the second accommodating piece enter the liquid cooling assembly without the transmission of the cooling liquid, and the liquid outlet switch is controlled to discharge liquid holes, so that the liquid holes are directly contacted with the batteries.
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| US11833377B2 (en) | 2019-11-27 | 2023-12-05 | Saft America | Fire suppression system for battery modules |
| US11324148B2 (en) | 2019-12-06 | 2022-05-03 | Delta Electronics, Inc. | Cooling system for power modules |
| KR20220001227A (en) * | 2020-06-29 | 2022-01-05 | 주식회사 엘지에너지솔루션 | Battery Module Comprising Heat Dissipation Member and Method for Preparing the Heat Dissipation Member |
| CN112238752A (en) * | 2020-09-04 | 2021-01-19 | 东风时代(武汉)电池系统有限公司 | Passive detection and protection system and method for thermal runaway of battery pack |
| CN113675497B (en) * | 2021-07-20 | 2022-12-23 | 哈尔滨工业大学 | Immersed liquid cooling energy storage battery box |
| CN113904011A (en) * | 2021-11-22 | 2022-01-07 | 江苏科技大学 | Power battery explosion-proof device with temperature control system and fire extinguishing device |
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