CN112448066B - Battery thermal management system and control method thereof - Google Patents
Battery thermal management system and control method thereof Download PDFInfo
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- CN112448066B CN112448066B CN202011178944.XA CN202011178944A CN112448066B CN 112448066 B CN112448066 B CN 112448066B CN 202011178944 A CN202011178944 A CN 202011178944A CN 112448066 B CN112448066 B CN 112448066B
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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
- H01M10/633—Control systems characterised by algorithms, flow charts, software details or the like
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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
- H01M10/6554—Rods or plates
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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
- H01M10/6568—Liquids characterised by flow circuits, e.g. loops, located externally to the cells or cell casings
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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
Abstract
The application provides a battery thermal management system and a control method thereof. The battery thermal management system comprises a battery system, a liquid flow circulating cooling system, a monitoring device and a control device. The battery system comprises a battery box body and at least one battery module positioned in the battery box body. The liquid circulation cooling system is positioned in the battery box body and comprises at least one liquid cooling plate positioned on the top surface of the battery box body. The liquid cooling plate is of a hollow cavity structure. A flow passage is arranged in the cavity of the liquid cooling plate. The flow passage is used for providing a passage for the cooling liquid to flow in the cavity. And the bottom of the liquid cooling plate is provided with a drain hole, and when the drain hole is opened, the cooling liquid enters the battery box body through the drain hole. The monitoring device is positioned in the battery box body and used for monitoring the state parameters of the battery module. The control device is in communication connection with the monitoring device, is electrically connected with the liquid flow circulating cooling system and is used for regulating and controlling the flow ratio of each medium in the cooling liquid according to the state parameters of the battery module.
Description
Technical Field
The application relates to the technical field of battery temperature control and disaster protection, in particular to a battery thermal management system and a control method thereof.
Background
At present, global petroleum resources are increasingly exhausted, and environmental problems such as greenhouse effect and the like are more severe. Compared with power sources such as traditional internal combustion engines and motors, the lithium ion battery has great advantages in power density and environmental friendliness.
The application of the dynamic property, the quick charging and the large-capacity high-specific energy lithium ion battery of the electric automobile brings great challenges to the safety guarantee of the lithium ion battery. It is also required to design an effective safety management mode countermeasure based on the existing temperature control management. The lithium battery fire-fighting aspect has a mature technology, such as disaster protection by using fire extinguishing media such as water, foam, dry powder and the like. However, fire fighting of the battery often requires coordination of a fire department, so that intensive research on how to perform quick response in an abnormal state of the battery is needed.
Disclosure of Invention
In view of the above, it is necessary to provide a battery thermal management system and a control method thereof, which address the problem of how to achieve quick response in an abnormal state of a battery.
The application provides a battery thermal management system, includes:
the battery system comprises a battery box body and at least one battery module positioned in the battery box body;
the liquid flow circulating cooling system is positioned in the battery box body and comprises at least one liquid cooling plate positioned on the top surface of the battery box body, the liquid cooling plate is of a hollow cavity structure, a flow passage is arranged in a cavity of the liquid cooling plate, and the flow passage is used for providing a passage for the cooling liquid to flow in the cavity; the bottom of the liquid cooling plate is provided with a drain hole, and when the drain hole is opened, cooling liquid enters the battery box body through the drain hole;
the monitoring device is positioned in the battery box body and used for monitoring the state parameters of the battery module; and
and the control device is in communication connection with the monitoring device, is electrically connected with the liquid flow circulating cooling system and is used for regulating and controlling the flow ratio of each medium in the cooling liquid according to the state parameters of the battery module.
In one embodiment, a heat-sensitive component is arranged on the drain port, and the drain port is sealed by the heat-sensitive component when the state parameter of the battery module is smaller than or equal to a first state parameter threshold value; and when the state parameter of the battery module is larger than the first state parameter threshold value, the heat-sensitive component melts, the drain port is opened, and the cooling liquid flows into the battery box body through the drain port.
In one embodiment, the heat sensitive member is made of paraffin, slaked lime, resin, or a hot-melt alloy.
In one embodiment, the liquid circulation cooling system further comprises a first liquid storage tank and a second liquid storage tank, wherein the first liquid storage tank is used for storing deionized water, and the second liquid storage tank is used for storing glycol;
when the state parameter of the battery module is greater than or equal to a second state parameter threshold value and less than or equal to a first state parameter threshold value, adjusting the opening degree of a first switch valve corresponding to the first liquid storage tank and the opening degree of a second switch valve corresponding to the second liquid storage tank through the control device, and providing cooling liquid formed by mixing deionized water and ethylene glycol for the liquid cooling plate; wherein the first state parameter threshold is greater than the second state parameter threshold;
when the state parameter of the battery module is larger than the first state parameter threshold value, the control device controls the second switch valve to be closed, and the first switch valve is opened to provide deionized water for the liquid cooling plate.
In one embodiment, the cooling liquid is formed by mixing deionized water and ethylene glycol, and the ratio of the deionized water to the ethylene glycol is 1: 1-9: 1.
In one embodiment, the liquid circulation cooling system further comprises a first liquid storage tank and a third liquid storage tank, wherein the first liquid storage tank is used for storing deionized water, and the third liquid storage tank is used for storing antifreeze;
when the state parameter of the battery module is greater than or equal to a second state parameter threshold value and less than or equal to a first state parameter threshold value, the control device controls a first switch valve corresponding to the first liquid storage tank to be closed, a third switch valve corresponding to the third liquid storage tank to be opened, and the antifreeze is used as cooling liquid to be supplied to the liquid cooling plate;
when the state parameter of the battery module is larger than the first state parameter threshold value, the control device controls the third switch valve to be closed, and the first switch valve is opened to provide deionized water for the liquid cooling plate.
In one embodiment, a normally open pressure release valve and a drain valve are arranged on the side surface of the battery box body, wherein the height of the drain valve is smaller than that of the normally open pressure release valve.
In one embodiment, the monitoring device comprises one of a temperature sensor, a pressure sensor, or a gas sensor.
Based on the same inventive concept, the present application further provides a control method of the battery thermal management system as in any one of the above embodiments, including:
monitoring state parameters of the battery module;
and regulating and controlling the flow ratio of each medium in the cooling liquid according to the state parameters of the battery module.
In one embodiment, a heat sensitive component is disposed on the drain port, and the control method further includes:
when the state parameter of the battery module is smaller than or equal to a first state parameter threshold value, the drainage port is sealed through the heat sensitive component; and when the state parameter of the battery module is larger than the first state parameter threshold value, the heat-sensitive component melts, the drain port is opened, and the cooling liquid flows into the battery box body through the drain port.
In summary, the present application provides a battery thermal management system and a control method thereof. The battery thermal management system comprises a battery system, a liquid flow circulating cooling system, a monitoring device and a control device. The battery system comprises a battery box body and at least one battery module positioned in the battery box body. The liquid circulation cooling system is positioned in the battery box body and comprises at least one liquid cooling plate positioned on the top surface of the battery box body. The liquid cooling plate is of a hollow cavity structure. And a flow passage is arranged in the cavity of the liquid cooling plate. The flow passage is used for providing a passage for the cooling liquid to flow in the cavity. And the bottom of the liquid cooling plate is provided with a drain hole, and when the drain hole is opened, cooling liquid enters the battery box body through the drain hole. The monitoring device is positioned in the battery box body and used for monitoring the state parameters of the battery module. The control device is in communication connection with the monitoring device, is electrically connected with the liquid flow circulating cooling system, and is used for regulating and controlling the flow ratio of each medium in the cooling liquid according to the state parameters of the battery module. In this application, according to the state parameter of battery module confirms the battery thermal state, and then can regulate and control according to the battery thermal state the flow ratio of each medium in the coolant liquid, when the battery thermal state is in abnormal state and needs safety control promptly, can regulate and control according to the battery thermal state the flow ratio of each medium in the coolant liquid, later the back is opened to the earial drainage mouth, and the coolant liquid passes through the earial drainage mouth gets into the battery box, irritates the battery flooding, realizes carrying out quick response under the battery abnormal state.
Drawings
Fig. 1 is a schematic structural diagram of a battery thermal management system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a battery thermal management system according to another embodiment of the present application;
fig. 3 is a schematic flowchart of a control method of a battery thermal management system according to an embodiment.
Description of the main element reference numerals
10. A battery system; 11. a battery case; 12. a battery module; 20. a liquid circulation cooling system; 21. a liquid-cooled plate; 211. a flow channel; 212. a bleed port; 213. a heat-sensitive component; 221. a first liquid storage tank; 222. a second liquid storage tank; 223. a third liquid storage tank; 231. a first on-off valve; 232. a second on-off valve; 233. a third on-off valve; 24. a liquid flow circulating water pump; 25. a heat sink; 26. a flow mixer; 27. a three-way valve; 281. a normally open pressure relief valve; 282. a drain valve; 283. a check valve; 30. a monitoring device; 40. and a control device.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.
The lithium ion battery power system comprises a liquid flow circulation temperature control system, a safety management system and other accessory systems besides the fuel battery body. The liquid flow circulation temperature control system keeps the temperature of the galvanic pile at a proper level in a coolant circulation mode, and ensures the stable and reliable work of the galvanic pile. The safety management system is the brain of the whole lithium ion battery power system, and is used for optimally controlling each subsystem at the periphery of the galvanic pile, so that the galvanic pile is in the optimal working state, and the long-term stable and reliable operation of the galvanic pile is ensured.
In order to solve the problem of quick response in an abnormal state of a battery, the embodiment of the application provides a battery thermal management system. The battery thermal management system comprises a battery system 10, a liquid circulation cooling system 20, a monitoring device 30 and a control device 40. The battery system 10 includes a battery case 11 and at least one battery module 12 located in the battery case 11. The hydronic cooling system 20 is located in the battery box 11 and includes at least one liquid cooling plate 21 located on the top surface of the battery box 11. The liquid cooling plate 21 is a hollow cavity structure. A flow passage 211 is arranged in the cavity of the liquid cooling plate 21. The flow channel 211 is used to provide a passage for the cooling liquid to flow in the cavity. Moreover, the bottom of the liquid cooling plate 21 is provided with a drain port 212, and when the drain port 212 is opened, the cooling liquid enters the battery case 11 through the drain port 212. The monitoring device 30 is located in the battery box 11 and is used for monitoring the state parameters of the battery module 12. The control device 40 is in communication connection with the monitoring device 30, is electrically connected with the liquid circulation cooling system 20, and is used for regulating and controlling the flow ratio of each medium in the cooling liquid according to the state parameters of the battery module 12.
It is understood that the battery module 12 includes at least one battery cell. The structure of the battery case 11 is not particularly limited, and the battery case 11 may be a cubic structure or a cylindrical structure. And an accommodating groove is formed in the inner top surface of the battery box body 11. The receiving groove is used for receiving the liquid cooling plate 21. Heat exchange is performed between the liquid cooling plate 21 and the battery module 12 to maintain the battery module 12 in a normal operation state. And when the battery module 12 is in an abnormal state such as thermal runaway, the cooling liquid in the liquid cooling plate 21 enters the battery box 11 through the drain port 212 to flood the battery cells, so that quick response is realized in the abnormal state of the battery.
It is understood that the manner of opening the drain port 212 is not particularly limited as long as the drain port 212 can be controlled to be opened when the pool thermal state is in an abnormal state. Referring to fig. 1, in an implementation manner, the drainage port 212 is blocked by the heat sensitive member 213, and after melting at a high temperature, the coolant floods the space of the battery case 11, so as to achieve safety management. The heat sensitive member 213 may be made of, but not limited to, paraffin, hydrated lime, resin, or hot-melt alloy. The hot-melting alloy can be silver, aluminum, bismuth, cadmium, gallium, indium, antimony, lead, tin and other alloys, and the specific types of the alloy can be, but are not limited to: bi58Sn 42; bi57Sn42 Agl; bi58Sn 42; in51Bi32Sn 17; bi50Pb43Bil 4; bi50Pb25Sn 25; in51Bi32Sn 17; bi50Pb28Sn 22; bi42Pb42Sn 16; bi52Pb32Sn 16; bi50Pb28SN 22; bi42Pb42Sn 16; bi52Pb32Sn16 Bi57Sn17In 26; bi44Pb25Sn25Cd 6; bi50Sn31Pb 19; bi56Pb 43; bi60Cd 40; bi56Sn40Zn 4. Of course, an electrically operated valve may be disposed at the drain port 212, and when the thermal state of the cell is abnormal, the electrically operated valve is controlled by the controller to open, so that the coolant floods the space of the cell casing 11.
It is understood that the structure of the monitoring device 30 is not particularly limited as long as the state parameters of the battery module 12 can be monitored. The condition parameter may be, and is not limited to, temperature, pressure, or gas concentration. The monitoring device 30 may be, without limitation, one or a combination of temperature, pressure, or gas sensors.
It is understood that the thermal state of the battery module 12 is judged by the state parameter value monitored by the monitoring device 30. The thermal state of the battery module 12 includes an optimal operation state, a temperature control management demand state, and a safety management demand state. The optimal operation state means that the battery system 10 can be normally supplied with power without the operation of the liquid circulation cooling system 20. The temperature control management demand state refers to a manner in which coolant circulation is required to maintain the stack temperature at a suitable level. The safety management demand state refers to a situation in which the temperature of the stack cannot be maintained at an appropriate level only by a coolant circulation method when an abnormal condition such as thermal runaway occurs in the battery module 12.
It is understood that a first state parameter threshold and a second state parameter threshold may be set, and the thermal state of the battery module 12 may be determined by determining the relationship between the state parameter and the first state parameter threshold and the second state parameter threshold. Wherein the first state parameter threshold is greater than the second state parameter threshold. The first state parameter threshold and the second state parameter threshold may be preset values or may be obtained by table lookup. And when the state parameter of the battery module 12 is smaller than the second state parameter threshold value, determining that the battery module 12 is in the optimal battery running state. And when the state parameter of the battery module 12 is greater than or equal to the second state parameter threshold and less than or equal to the first state parameter threshold, determining that the battery module 12 is in the temperature control management demand state. And when the state parameter of the battery module 12 is greater than the first state parameter threshold value, determining that the battery module 12 is in a safety management required state. Alternatively, when the monitoring device 30 is a temperature sensor, the battery operation optimal state is 20-30 ℃, the temperature control management required state is 40-60 ℃, and the safety management required state is 60-90 ℃.
When the state parameter of the battery module 12 is greater than the first state parameter threshold, the heat sensitive component 213 melts, the drain port 212 opens, the cooling liquid flows into the battery box 11 through the drain port 212, and the single battery is flooded, so that the quick response is realized in the abnormal state of the battery. When the state parameter of the battery module 12 is greater than or equal to the second state parameter threshold and less than or equal to the first state parameter threshold, the flow ratio of each medium in the cooling liquid is regulated and controlled by the control device 40, so that heat exchange is performed between the liquid cooling plate 21 and the battery module 12, and the battery module 12 is kept in a normal operation state.
In this application, according to battery module 12's state parameter confirms the battery thermal state, and then can regulate and control according to the battery thermal state the flow ratio of each medium in the coolant liquid, when the battery thermal state is in abnormal state needs safety control promptly, can regulate and control according to the battery thermal state the flow ratio of each medium in the coolant liquid, later after the drain port 212 is opened the back, the coolant liquid passes through drain port 212 gets into battery box 11 floods the battery, realizes carrying out quick response under the battery abnormal state.
Referring to fig. 1, in one embodiment, the hydronic cooling system 20 includes a hydronic pump 24, a radiator 25, and a liquid cooling plate 21. The liquid circulation water pump 24, the radiator 25 and the flow channel 211 of the liquid cooling plate 21 are connected through liquid pipelines to form a closed cooling liquid circulation pipeline. To prevent the coolant from flowing backward, check valves 283 may be provided at both ends of the liquid-cooling plate 21. The liquid circulation cooling system 20 further comprises a first liquid storage tank 221 and a second liquid storage tank 222, wherein the first liquid storage tank 221 is used for storing deionized water, and the second liquid storage tank 222 is used for storing glycol. The first storage tank 221 and the second storage tank 222 are both connected with the inlet of the flow mixer 26 through a pipeline. And a first switch valve 231 is arranged between the first storage tank 221 and the inlet of the flow mixer 26, and a second switch valve 232 is arranged between the second storage tank 222 and the inlet of the flow mixer 26. The first switching valve 231 and the second switching valve 232 are electrically connected to the control device 40, respectively. The outlet of the flow mixer 26 is connected to the coolant circulation line by a three-way valve 27.
When the state parameter of the battery module 12 is greater than or equal to the second state parameter threshold and less than or equal to the first state parameter threshold, the control device 40 adjusts the opening degree of the first switch valve 231 corresponding to the first liquid storage tank 221 and the opening degree of the second switch valve 232 corresponding to the second liquid storage tank 222, so as to provide the liquid cooling plate 21 with cooling liquid formed by mixing deionized water and ethylene glycol; the coolant formed by mixing the deionized water and ethylene glycol is mixed in the flow mixer 26. Wherein the first state parameter threshold is greater than the second state parameter threshold; when the state parameter of the battery module 12 is greater than the first state parameter threshold, the control device 40 controls the second switch valve 232 to close, and the first switch valve 231 to open, so as to provide deionized water for the liquid cooling plate 21. When the state parameter of the battery module 12 is smaller than the second state parameter threshold, the control device 40 controls the second switch valve 232 to close, and the first switch valve 231 to close.
Because the mixing proportion of the deionized water and the ethylene glycol is different, the specific heat capacity of the formed cooling liquid is different, and the cooling liquid has different heat exchange capacities. Therefore, when the state parameter of the battery module 12 is greater than or equal to the second state parameter threshold and less than or equal to the first state parameter threshold, the interval where the state parameter is located may be further divided to determine the ratio between the deionized water and the ethylene glycol. In one embodiment, the cooling liquid is formed by mixing deionized water and ethylene glycol, and the ratio of the deionized water to the ethylene glycol is 1: 1-9: 1. See table one for specific heat capacity of media after mixing at different ratios.
TABLE I specific heat capacity of media after mixing in different proportions
In one embodiment, a normally open pressure relief valve 281 and a pressure relief valve 282 are disposed on a side of the battery case 11, wherein a height of the pressure relief valve 282 is smaller than a height of the normally open pressure relief valve 281. When the state parameter of the battery module 12 is greater than or equal to the second state parameter threshold value and less than or equal to the first state parameter threshold value, the liquid flow circulating water pump 24 is operated, and the radiator 25 is opened. The drain valve 282 is closed and the drain port 212 is closed to exchange heat with the battery module 12 through the liquid cooling plate 21 to maintain the battery module 12 in a normal operation state.
When the state parameter of the battery module 12 is greater than the first state parameter threshold value, the second switch valve 232 is closed, the first switch valve 231 is opened, the drain port 212 is opened, deionized water flows into the battery box body 11 through the drain port 212, and after the deionized water enters the battery box body 11, when the safety management requirement is not met, the drain valve 282 is closed, and the formed water vapor can be discharged from the normally-open pressure release valve 281. After the deionized water enters the battery box 11 and meets the safety management requirement, the drain valve 282 is opened, and the residual liquid deionized water can be drained to the environment from the valve.
In one embodiment, an insulating layer is disposed on an outer surface of the first storage tank 221 to reduce heat exchange between the deionized water stored in the first storage tank 221 and an external environment. The insulation may be, but is not limited to, rock wool, polyurethane foam, and the like.
Referring to fig. 2, in one embodiment, the hydronic cooling system 20 includes a hydronic pump 24, a radiator 25, and a liquid cooling plate 21. The liquid circulation water pump 24, the radiator 25 and the flow channel 211 of the liquid cooling plate 21 are connected through liquid pipelines to form a closed cooling liquid circulation pipeline. To prevent the coolant from flowing backward, check valves 283 may be provided at both ends of the liquid-cooling plate 21. The liquid circulation cooling system 20 further comprises a first liquid storage tank 221 and a third liquid storage tank 223, wherein the first liquid storage tank 221 is used for storing deionized water, and the third liquid storage tank 223 is used for storing an antifreeze. The first and third switching valves 231 and 233 are connected to the coolant circulation line through three-way valves 27, respectively. A first on-off valve 231 is provided between the first reservoir 221 and the three-way valve 27, and a third on-off valve 233 is provided between the second reservoir 222 and the three-way valve 27. The first switching valve 231 and the third switching valve 233 are electrically connected to the control device 40, respectively. The three-way valve 27 may be an electromagnetic three-way valve.
When the state parameter of the battery module 12 is greater than or equal to the second state parameter threshold and less than or equal to the first state parameter threshold, the control device 40 controls the first switch valve 231 corresponding to the first liquid storage tank 221 to be closed, and controls the third switch valve 233 corresponding to the third liquid storage tank 223 to be opened, so that the antifreeze is provided to the liquid cooling plate 21 as the coolant; when the state parameter of the battery module 12 is greater than the first state parameter threshold, the control device 40 controls the third switch valve 233 to close and the first switch valve 231 to open, so as to provide deionized water for the liquid cooling plate 21.
In one embodiment, a normally open pressure relief valve 281 and a pressure relief valve 282 are disposed on a side of the battery case 11, wherein a height of the pressure relief valve 282 is smaller than a height of the normally open pressure relief valve 281. When the state parameter of the battery module 12 is greater than or equal to the second state parameter threshold value and less than or equal to the first state parameter threshold value, the liquid flow circulating water pump 24 is operated, and the radiator 25 is opened. The control device 40 controls the first switch valve 231 corresponding to the first liquid storage tank 221 to be closed, the third switch valve 233 corresponding to the third liquid storage tank 223 to be opened, and regulates and controls the electromagnetic three-way valve, so that the deionized water side channel is closed, and the antifreeze liquid side channel is opened. The drain valve 282 is closed and the drain port 212 is closed to exchange heat with the battery module 12 through the antifreeze to maintain the battery module 12 in a normal operation state.
When the state parameter of the battery module 12 is greater than the first state parameter threshold, the control device 40 controls the third switch valve 233 to close, the first switch valve 231 to open, and regulates the electromagnetic three-way valve, so that the deionized water side channel is opened, and the antifreeze side channel is closed. The drain port 212 is opened, deionized water flows into the battery box body 11 through the drain port 212, and after the deionized water enters the battery box body 11 and does not meet the requirement of safety management, the drain valve 282 is closed, and formed water vapor can be discharged from the normally-open pressure release valve 281. In order to meet the requirement of safety management, after deionized water enters the battery box body 11, the controller can regulate and control the third switch valve 233 to be opened, and regulate and control the electromagnetic three-way valve to be opened to open the antifreeze liquid side channel. After deionized water and/or antifreeze enters the battery box 11 and safety management requirements are met, the drain valve 282 is opened, and residual liquid can drain from the valve to the environment.
Referring to fig. 3, based on the same inventive concept, the present application further provides a control method of the battery thermal management system according to any one of the above embodiments, including:
s10, monitoring the state parameters of the battery module 12;
and S20, regulating and controlling the flow ratio of each medium in the cooling liquid according to the state parameters of the battery module 12.
It is understood that the thermal state of the battery module 12 is judged by the state parameter value monitored by the monitoring device 30. The thermal state of the battery module 12 includes an optimal operation state, a temperature control management demand state, and a safety management demand state. The optimal operation state means that the battery system 10 can be normally supplied with power without the operation of the liquid circulation cooling system 20. The temperature control management demand state refers to a manner in which coolant circulation is required to maintain the stack temperature at a suitable level. The safety management demand state refers to a situation in which the temperature of the stack cannot be maintained at an appropriate level only by a coolant circulation method when an abnormal condition such as thermal runaway occurs in the battery module 12.
It is understood that a first state parameter threshold and a second state parameter threshold may be set, and the thermal state of the battery module 12 may be determined by determining the relationship between the state parameter and the first state parameter threshold and the second state parameter threshold. Wherein the first state parameter threshold is greater than the second state parameter threshold. The first state parameter threshold and the second state parameter threshold may be preset values or may be obtained by table lookup. And when the state parameter of the battery module 12 is smaller than the second state parameter threshold value, determining that the battery module 12 is in the optimal battery running state. And when the state parameter of the battery module 12 is greater than or equal to the second state parameter threshold and less than or equal to the first state parameter threshold, determining that the battery module 12 is in the temperature control management demand state. And when the state parameter of the battery module 12 is greater than the first state parameter threshold value, determining that the battery module 12 is in a safety management required state. Alternatively, when the monitoring device 30 is a temperature sensor, the battery operation optimal state is 20-30 ℃, the temperature control management required state is 40-60 ℃, and the safety management required state is 60-90 ℃.
Optionally, when the state parameter of the battery module 12 is greater than or equal to the second state parameter threshold and less than or equal to the first state parameter threshold, the opening degree of the first on-off valve 231 corresponding to the first liquid storage tank 221 and the opening degree of the second on-off valve 232 corresponding to the second liquid storage tank 222 are adjusted by the control device 40, so as to provide the cooling liquid formed by mixing deionized water and ethylene glycol for the liquid cooling plate 21.
Optionally, when the state parameter of the battery module 12 is greater than or equal to the second state parameter threshold and less than or equal to the first state parameter threshold, the control device 40 controls the first switch valve 231 corresponding to the first liquid storage tank 221 to be closed, and controls the third switch valve 233 corresponding to the third liquid storage tank 223 to be opened, so as to provide the antifreeze as the coolant to the liquid cooling plate 21.
In this embodiment, the thermal state of the battery is determined according to the state parameters of the battery module 12, and then the flow ratio of each medium in the coolant can be regulated according to the thermal state of the battery, that is, when the thermal state of the battery is in an abnormal state and safety management is required, the flow ratio of each medium in the coolant can be regulated according to the thermal state of the battery, and then after the drain port 212 is opened, the coolant enters the battery box 11 through the drain port 212 to flood the battery, so that quick response is realized in the abnormal state of the battery.
In one embodiment, a thermosensitive member 213 is disposed on the drain port 212, and the control method further includes:
when the state parameter of the battery module 12 is less than or equal to the first state parameter threshold value, the drain port 212 is sealed by the heat sensitive component 213; and when the state parameter of the battery module 12 is greater than the first state parameter threshold value, the heat sensitive member 213 melts, the drain port 212 opens, and the cooling liquid flows into the battery case 11 through the drain port 212.
Optionally, when the state parameter of the battery module 12 is greater than the first state parameter threshold value, the second switch valve 232 is closed, the first switch valve 231 is opened, the drain port 212 is opened, deionized water flows into the battery box 11 through the drain port 212, and after the deionized water enters the battery box 11 and does not meet the requirement of safety management yet, the drain valve 282 is closed, and the formed water vapor can be discharged from the normally-open pressure release valve 281. After the deionized water enters the battery box 11 and meets the safety management requirement, the drain valve 282 is opened, and the residual liquid deionized water can be drained to the environment from the valve.
Optionally, when the state parameter of the battery module 12 is greater than the first state parameter threshold, the control device 40 controls the third on-off valve 233 to close, the first on-off valve 231 to open, and regulates the electromagnetic three-way valve, so that the deionized water side channel is opened and the antifreeze side channel is closed. The drain port 212 is opened, deionized water flows into the battery box body 11 through the drain port 212, and after the deionized water enters the battery box body 11 and does not meet the requirement of safety management, the drain valve 282 is closed, and formed water vapor can be discharged from the normally-open pressure release valve 281. In order to meet the requirement of safety management, after deionized water enters the battery box body 11, the controller can regulate and control the third switch valve 233 to be opened, and regulate and control the electromagnetic three-way valve to be opened to open the antifreeze liquid side channel. After deionized water and/or antifreeze enters the battery box 11 and safety management requirements are met, the drain valve 282 is opened, and residual liquid can drain from the valve to the environment.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not 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 concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A battery thermal management system, comprising:
the battery system comprises a battery box body and at least one battery module positioned in the battery box body;
the liquid flow circulating cooling system is positioned in the battery box body and comprises at least one liquid cooling plate positioned on the top surface of the battery box body, the liquid cooling plate is of a hollow cavity structure, a flow passage is arranged in a cavity of the liquid cooling plate, and the flow passage is used for providing a passage for the cooling liquid to flow in the cavity; the bottom of the liquid cooling plate is provided with a drain hole, and when the drain hole is opened, cooling liquid enters the battery box body through the drain hole;
the monitoring device is positioned in the battery box body and used for monitoring the state parameters of the battery module; and
the control device is in communication connection with the monitoring device, is electrically connected with the liquid flow circulating cooling system and is used for regulating and controlling the flow ratio of each medium in the cooling liquid according to the state parameters of the battery module;
the device comprises a first liquid storage tank and a second liquid storage tank, wherein the first liquid storage tank is used for storing deionized water, and the second liquid storage tank is used for storing glycol;
when the state parameter of the battery module is greater than or equal to a second state parameter threshold value and less than or equal to a first state parameter threshold value, adjusting the opening degree of a first switch valve corresponding to the first liquid storage tank and the opening degree of a second switch valve corresponding to the second liquid storage tank through the control device, and providing cooling liquid formed by mixing deionized water and ethylene glycol for the liquid cooling plate; wherein the first state parameter threshold is greater than the second state parameter threshold;
when the state parameter of the battery module is larger than the first state parameter threshold value, the control device controls the second switch valve to be closed, the first switch valve is opened to provide deionized water for the liquid cooling plate, the first state parameter threshold value and the second state parameter threshold value are preset values or values obtained by table lookup, when the state parameter of the battery module is smaller than the second state parameter threshold value, the battery module is judged to be in the optimal battery running state, when the state parameter of the battery module is larger than or equal to the second state parameter threshold value and smaller than or equal to the first state parameter threshold value, the battery module is judged to be in the temperature control management demand state, and when the state parameter of the battery module is larger than the first state parameter threshold value, the battery module is judged to be in the safety management demand state.
2. The battery thermal management system of claim 1, wherein a heat sensitive member is disposed on the drain port, and the drain port is sealed by the heat sensitive member when the state parameter of the battery module is less than or equal to the first state parameter threshold; and when the state parameter of the battery module is larger than the first state parameter threshold value, the heat-sensitive component melts, the drain port is opened, and cooling liquid flows into the battery box body through the drain port.
3. The battery thermal management system of claim 2, wherein the heat sensitive member is made of paraffin, slaked lime, resin, or a hot melt alloy.
4. The battery thermal management system of claim 2, wherein the coolant formed by mixing deionized water and ethylene glycol is present in a ratio of deionized water to ethylene glycol of 1:1 to 9: 1.
5. A battery thermal management system, comprising:
a battery thermal management system, comprising:
the battery system comprises a battery box body and at least one battery module positioned in the battery box body;
the liquid flow circulating cooling system is positioned in the battery box body and comprises at least one liquid cooling plate positioned on the top surface of the battery box body, the liquid cooling plate is of a hollow cavity structure, a flow passage is arranged in a cavity of the liquid cooling plate, and the flow passage is used for providing a passage for the cooling liquid to flow in the cavity; the bottom of the liquid cooling plate is provided with a drain hole, and when the drain hole is opened, cooling liquid enters the battery box body through the drain hole;
the monitoring device is positioned in the battery box body and used for monitoring the state parameters of the battery module; and
the control device is in communication connection with the monitoring device, is electrically connected with the liquid flow circulating cooling system and is used for regulating and controlling the flow ratio of each medium in the cooling liquid according to the state parameters of the battery module;
the first liquid storage tank is used for storing deionized water, and the third liquid storage tank is used for storing an antifreezing agent;
when the state parameter of the battery module is greater than or equal to a second state parameter threshold value and less than or equal to a first state parameter threshold value, the control device controls a first switch valve corresponding to the first liquid storage tank to be closed, a third switch valve corresponding to the third liquid storage tank to be opened, and the antifreeze is used as cooling liquid to be supplied to the liquid cooling plate;
when the state parameter of the battery module is greater than the first state parameter threshold, the control device controls the third switch valve to be closed, the first switch valve is opened to provide deionized water for the liquid cooling plate, the first state parameter threshold and the second state parameter threshold are preset values or values obtained by table lookup, when the state parameter of the battery module is smaller than the second state parameter threshold, the battery module is judged to be in the optimal battery running state, when the state parameter of the battery module is greater than or equal to the second state parameter threshold and less than or equal to the first state parameter threshold, the battery module is judged to be in the temperature control management required state, and when the state parameter of the battery module is greater than the first state parameter threshold, the battery module is judged to be in the safety management required state.
6. The battery thermal management system of claim 5, wherein a heat sensitive member is disposed on the drain port, and the drain port is sealed by the heat sensitive member when the state parameter of the battery module is less than or equal to the first state parameter threshold; and when the state parameter of the battery module is larger than the first state parameter threshold value, the heat-sensitive component melts, the drain port is opened, and cooling liquid flows into the battery box body through the drain port.
7. The battery thermal management system of claim 1, wherein a normally open pressure relief valve and a drain valve are disposed on a side of the battery case, wherein a height of the drain valve is less than a height of the normally open pressure relief valve.
8. The battery thermal management system of claim 1, wherein the monitoring device comprises one of a temperature sensor, a pressure sensor, or a gas sensor.
9. A control method of the battery thermal management system according to any one of claims 1 to 8, comprising:
monitoring state parameters of the battery module;
and regulating and controlling the flow ratio of each medium in the cooling liquid according to the state parameters of the battery module.
10. The method of controlling a battery thermal management system of claim 9, wherein a heat sensitive member is disposed on the bleed port, the method further comprising:
when the state parameter of the battery module is smaller than or equal to a first state parameter threshold value, the drainage port is sealed through the heat sensitive component; and when the state parameter of the battery module is larger than the first state parameter threshold value, the heat-sensitive component melts, the drain port is opened, and the cooling liquid flows into the battery box body through the drain port.
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| CN115692911B (en) * | 2021-07-30 | 2023-10-20 | 宁德时代新能源科技股份有限公司 | Battery and electricity utilization device |
| CN114497803A (en) * | 2022-01-05 | 2022-05-13 | 岚图汽车科技有限公司 | Power battery thermal management module, power battery and vehicle |
| WO2024023830A1 (en) * | 2022-07-29 | 2024-02-01 | Tvs Motor Company Limited | Thermal system for battery pack, fast-charging system and method of fast-charging thereof |
| CN117748011A (en) * | 2024-02-09 | 2024-03-22 | 合众新能源汽车股份有限公司 | Battery module and electric equipment |
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| JPH06124733A (en) * | 1992-10-08 | 1994-05-06 | Hitachi Ltd | Secondary battery device |
| CN211376746U (en) * | 2020-02-21 | 2020-08-28 | 宁德时代新能源科技股份有限公司 | Battery pack and device |
| CN111668573A (en) * | 2020-06-16 | 2020-09-15 | 建德希傅电子科技有限公司 | Novel power battery cooling liquid self-interacting equipment |
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| JP5193660B2 (en) * | 2008-04-03 | 2013-05-08 | 株式会社日立製作所 | Battery module, power storage device including the same, and electric system |
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| JPH06124733A (en) * | 1992-10-08 | 1994-05-06 | Hitachi Ltd | Secondary battery device |
| CN211376746U (en) * | 2020-02-21 | 2020-08-28 | 宁德时代新能源科技股份有限公司 | Battery pack and device |
| CN111668573A (en) * | 2020-06-16 | 2020-09-15 | 建德希傅电子科技有限公司 | Novel power battery cooling liquid self-interacting equipment |
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