CN114464924A - Power battery pack with immersion cooling, immersion cooling method and vehicle - Google Patents
Power battery pack with immersion cooling, immersion cooling method and vehicle Download PDFInfo
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- CN114464924A CN114464924A CN202210381929.8A CN202210381929A CN114464924A CN 114464924 A CN114464924 A CN 114464924A CN 202210381929 A CN202210381929 A CN 202210381929A CN 114464924 A CN114464924 A CN 114464924A
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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
- H01M10/65—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
- H01M10/658—Means for temperature control structurally associated with the cells by thermal insulation or shielding
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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
- H01M50/249—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders specially adapted for aircraft or vehicles, e.g. cars or trains
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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
- H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
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- General Chemical & Material Sciences (AREA)
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- Aviation & Aerospace Engineering (AREA)
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- Battery Mounting, Suspending (AREA)
Abstract
The invention provides an immersion cooling power battery pack, an immersion cooling method and a vehicle, wherein the power battery pack comprises a battery box, a plurality of cross beams are arranged in the battery box side by side at intervals, the cross beams divide the internal space of the battery box into a plurality of accommodating cavities, and battery modules are arranged in the accommodating cavities; the side walls of the battery box are enclosed by two opposite parallel first side walls and two opposite parallel second side walls, and the cross beam and the second side walls are parallel to each other; gaps are reserved between the two ends of the cross beam and the first side walls on the two sides, and a first flow channel and a second flow channel are formed along the two first side walls; and a liquid inlet close to the first flow channel and a liquid outlet close to the second flow channel are respectively arranged on the two second side walls. Compared with liquid cooling, the immersion type cooling system provided by the invention has the advantages of shorter heat transfer path, larger cooling area, higher cooling efficiency and better cooling effect in the aspects of heat management and thermal runaway.
Description
Technical Field
The invention belongs to the technical field of power batteries, and relates to an immersion cooling power battery pack, an immersion cooling method and a vehicle.
Background
The power battery is used as a main power source of the electric automobile and is rapidly applied and developed. The overall performance of the power battery is obviously affected by the temperature, the active substances of the power battery are enhanced at high temperature, irreversible chemical reaction can occur, thermal runaway is caused, vehicles are ignited and exploded, local hot areas are formed when the temperature difference is large, the high temperature is attenuated too fast, and the cycle life of the power battery is shortened. Therefore, the effective control of the battery temperature for reasonable heat exchange is a main concern of the design of the battery thermal management system.
At present, air, liquid or phase-change materials are mainly adopted to design a thermal management system of the power battery. The air cooling structure has the lowest manufacturing cost and can effectively ventilate when the battery generates harmful gas, but is limited by low heat conductivity of air, particularly under a high-temperature environment or a high-current discharge working condition of the battery, the air cooling system cannot meet the heat management requirement of the battery system, and the heat dissipation structure designed by the phase-change material is complex and has increased volume and cannot meet the design requirement of compact structure of the battery pack, so that the liquid cooling structure is widely adopted for high-temperature heat dissipation of the battery to become the mainstream of the heat management structure design of the whole vehicle, and great development potential is realized.
CN210607415U discloses a battery module casing, battery module, battery package and vehicle, the battery module casing includes: enclose and locate a plurality of electric core week side enclose the frame structure, enclose the frame structure and include: the cooling device comprises two first side plates and two first end plates, wherein the two first side plates are oppositely arranged, at least one first side plate is a liquid cooling plate, the liquid cooling plate is provided with a fluid channel, and a cooling liquid inlet and a cooling liquid outlet which are communicated with the fluid channel are formed in the end part of the liquid cooling plate; wherein, the battery module casing still includes: the caliber of the cooling liquid inlet is larger than that of the fluid channel so as to be in a step shape and used for being plugged with the cooling liquid inlet connector, and the caliber of the cooling liquid outlet is larger than that of the fluid channel so as to be in a step shape and used for being plugged with the cooling liquid outlet connector.
CN213878204U discloses a cooling structure, which includes a box body; the liquid cooling plate is arranged in the box body and divides the box body into a module accommodating bin and a cooling bin in a first direction, the module accommodating bin is used for accommodating a battery module, the battery module is in contact with the liquid cooling plate, the cooling bin is used for accommodating cooling liquid, the cooling bin is provided with a liquid inlet and a liquid outlet, and the cooling liquid can flow into the cooling bin from the liquid inlet, flows along the liquid cooling plate and then flows out of the cooling bin from the liquid outlet; a plurality of vortex posts, it is a plurality of vortex post interval set up in the liquid cooling plate orientation one side in cooling chamber, the vortex post is arranged in right in the cooling chamber the coolant liquid carries out the vortex, the intensive degree of distribution of vortex post is followed the inlet arrives the liquid outlet is gradient and increases progressively and changes.
CN209860014U discloses a battery module cooling device and a battery module, wherein the battery module includes at least one battery core, the cooling device includes a battery case, each battery core is sleeved with a battery case, a cooling chamber is arranged in the battery case, and a cooling liquid is filled in the cooling chamber; the connecting assembly comprises connecting units in one-to-one correspondence with the battery cores, each battery shell is inserted into the corresponding connecting unit, each connecting unit is provided with a communicating hole communicated with the corresponding cooling chamber of the battery shell, and the communicating holes on the two adjacent connecting units are communicated.
The natural cooling scheme has low cooling efficiency, and can not well meet the heat dissipation requirement of the system for the system with high energy density and large heat generation quantity by natural cooling. The air cooling system has higher space requirement on the system and larger temperature difference. In the refrigerant direct cooling technology, the temperature difference of a refrigerant direct cooling scheme system is generally larger due to the characteristics of the refrigerant. The liquid cooling is widely applied and mature in technology, and is a scheme with good comprehensive performance at present, but due to the limitations of a heat transfer path, a cooling area and the like, the liquid cooling technology is difficult to further improve the cooling efficiency.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an immersion cooling power battery pack, an immersion cooling method and a vehicle. Compared with liquid cooling, the immersion type cooling system provided by the invention has the advantages of shorter heat transfer path, larger cooling area, higher cooling efficiency and better cooling effect in the aspects of heat management and thermal runaway.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides an immersion type cooled power battery pack which comprises a battery box, wherein a plurality of cross beams are arranged in the battery box at intervals side by side, the cross beams divide the inner space of the battery box into a plurality of accommodating cavities, and battery modules are arranged in the accommodating cavities.
The side wall of the battery box is enclosed by two opposite parallel first side walls and two opposite parallel second side walls, and the cross beam and the second side walls are parallel to each other.
Gaps are reserved between the two ends of the cross beam and the first side walls on the two sides, and a first flow channel and a second flow channel are formed along the two first side walls; the two second side walls are respectively provided with a liquid inlet close to the first flow channel and a liquid outlet close to the second flow channel, the liquid inlet continuously leads cooling liquid into the battery box, the cooling liquid respectively flows into different accommodating cavities through the first flow channel to soak and cool the battery module, and the cooling liquid is discharged from the liquid outlet through the second flow channel.
At present, the mainstream heat management mode of the power battery is liquid cooling, and the liquid cooling is characterized in that the heat transfer path from the battery core to the cold plate is long, so that the overall heat transfer resistance is large, and in addition, when the battery module is not regularly arranged, the flow channel design of the liquid cooling plate is difficult to achieve the consistency of the module cooling conditions of all positions, and further the system temperature difference can be increased. The invention provides a module soakage type heat management mode, wherein a battery module is wholly soaked into a cooling system for cooling, a cooling liquid circulation path can be controlled through a flow channel structure design in a battery box, and cooling liquid in the system can play a role in reducing the temperature of the module when the module is out of control due to thermal runaway, so that the module thermal runaway spreading is inhibited. Compared with liquid cooling, the immersion type cooling system provided by the invention has the advantages of shorter heat transfer path, larger cooling area, higher cooling efficiency and better cooling effect in the aspects of heat management and thermal runaway.
As a preferable technical scheme of the invention, the battery box comprises an open box body and an upper cover, and the upper cover is arranged at the opening of the box body.
The box body comprises a box body bottom plate and a box body boundary beam arranged along the outer edge of the box body bottom plate.
As a preferable technical solution of the present invention, the box body is formed by splicing a plurality of first members and a plurality of second members, and the first members and the second members are both integrally formed profile structures.
The first component comprises the cross beam and a first bottom plate, and the cross beam and the first bottom plate are perpendicular to each other to form a T-shaped structure; the first components are sequentially butted side by side along one side of the long edge of the first bottom plate to form a first assembly.
The second member comprises a side beam member and a second base plate, the second base plate is positioned on one side edge of the side beam member and is perpendicular to the side beam member; the second members are sequentially butted around the first assembly, and the boundary beam members are sequentially butted and closed to form the boundary beam of the box body; the second bottom plate and the first bottom plate of the first assembly are spliced to form the box body bottom plate.
As a preferable technical solution of the present invention, the first assembly is formed by butt-jointing the long sides of the first base plate side by side in sequence and then welding and fixing the long sides.
And after the second members are sequentially butted around the first assembly, the two end faces of the beam of the first assembly are respectively welded and fixed with the edge beam members of the second members at two sides.
After the boundary beam members of the second member are sequentially abutted and closed, the abutting joint of the boundary beam members is welded and fixed to form the boundary beam of the box body, and the abutting joint of the second bottom plate and the first bottom plate is welded and fixed to form the bottom plate of the box body.
As a preferable technical solution of the present invention, a gap is left between the battery module and the upper cover, and the cooling liquid entering the case flows through the top of the battery module.
According to the invention, the cooling liquid circularly flows at the top of the battery module, and when the battery module in the system is out of control due to heat, the cooling liquid at the top of the battery module can reduce the temperature of the battery module, so that air is prevented from contacting the battery module, and the effect of inhibiting the propagation of the out of control due to heat of the system is further realized.
The top surface of the cross beam is tightly attached to the inner side surface of the upper cover, and the tops of the adjacent two accommodating cavities are isolated.
The inner side surface of the upper cover is provided with a strip-shaped bulge, and the strip-shaped bulge corresponds to the top surface of the cross beam.
According to the invention, the battery module is wholly soaked in the cooling liquid, the cooling liquid circularly flows at the top of the battery module, the flow direction of the cooling liquid is adjusted by designing a corresponding flow guide structure on the upper cover, the heat management flow channel is designed to be in a parallel connection mode, the whole flow resistance of the parallel connection mode system is small, and the flow distribution of each branch is corrected through simulation analysis.
And a sealing strip is arranged between the strip-shaped bulge and the top surface of the cross beam.
The upper cover and the box body cross beam are fixed through the bolts, corresponding fixing points are designed on the box body cross beam, the upper cover is fixed to the box body cross beam through the bolts, sealing strips are designed on contact surfaces of the fixing points and the box body cross beam to prevent the cooling liquid from streaming, and therefore the flowing direction of the cooling liquid in the box body is controlled by the upper cover.
And a heat-insulating layer is laid on the outer surface of the upper cover.
According to the invention, the heat-insulating layer is laid outside the upper cover, so that the heat exchange between the cooling liquid in the battery system and the external environment is reduced, and the heat transfer from the external environment to the battery pack is reduced. In the infiltration cooling process of the whole battery system, the cooling liquid circularly flows at the top of the module, the upper cover plays a role in flow equalization, and the external heat preservation of the upper cover is integrated to achieve the purpose of uniformly cooling the battery module.
As a preferred technical scheme of the present invention, two adjacent battery modules are connected by a copper bar, so that the battery modules are connected in series or in parallel, and the copper bar is immersed in the coolant.
The copper bar is also subjected to an immersion cooling scheme, the requirement on the overcurrent capacity of the high-voltage copper bar is higher for a high-voltage 800V battery system, the high-voltage copper bar is immersed into cooling liquid by the immersion cooling scheme, the temperature of the high-voltage copper bar can be effectively reduced, the overcurrent capacity of the copper bar under the same overcurrent sectional area is increased, the overcurrent sectional area of the copper bar is reduced by 20% under the condition of the same overcurrent capacity, and the volume of the copper bar is equivalently reduced by 20%, so that the cost is reduced.
As a preferable technical solution of the present invention, a deionization device and a conductive ion detection device are arranged inside the battery box, the deionization device is used for removing conductive ions in the cooling liquid, and the conductive ion detection device is used for detecting the concentration of conductive ions in the cooling liquid.
The deionization device is arranged at the liquid inlet of the battery box, and the conductive ion detection device is arranged at the liquid outlet of the battery box.
Because module, high-pressure copper bar are whole to be soaked in the coolant liquid, like coolant liquid in use insulating nature reduces, is very dangerous to the system, in order to get rid of the electrically conductive ion in the coolant liquid, need install deionization equipment in the battery box, the ion concentration of the coolant liquid in the control battery box guarantees the electrical insulation. Simultaneously add conductive ion detection device at the battery box, the insulating nature of real-time detection coolant liquid, in time report to the police when not satisfying the requirement like the insulating nature of coolant liquid, change new coolant liquid to prevent danger, and then realize the effect of control coolant liquid electric conductivity. The deionization device is arranged at the inlet position of the cooling liquid in the system, the conductive ion detection device is arranged at the outlet position of the cooling liquid in the system, and the double protection realizes the insulativity of the cooling liquid in the system.
In a second aspect, the present invention provides an immersion cooling method for a power battery pack according to the first aspect, where the immersion cooling method includes:
the cooling liquid is continuously introduced into the battery box through the liquid inlet, the cooling liquid flows into different accommodating cavities through the first flow channel respectively to soak and cool the battery module, and the cooled cooling liquid is discharged from the liquid outlet through the second flow channel.
As a preferable technical scheme, in the process of introducing the cooling liquid, the deionization device removes conductive ions in the cooling liquid, the conductive ion detection device detects the concentration of the conductive ions in the cooling liquid in real time, and an alarm is triggered after the detected value exceeds a preset value.
In a third aspect, the invention provides a vehicle comprising the power battery pack of the first aspect.
Compared with the prior art, the invention has the beneficial effects that:
at present, the mainstream heat management mode of the power battery is liquid cooling, and the liquid cooling is characterized in that the heat transfer path from the battery core to the cold plate is long, so that the overall heat transfer resistance is large, and in addition, when the battery module is not regularly arranged, the flow channel design of the liquid cooling plate is difficult to achieve the consistency of the module cooling conditions of all positions, and further the system temperature difference can be increased. The invention provides a module soakage type heat management mode, wherein a battery module is wholly soaked into a cooling system for cooling, a cooling liquid circulation path can be controlled through a flow channel structure design in a battery box, and cooling liquid in the system can play a role in reducing the temperature of the module when the module is out of control due to thermal runaway, so that the module thermal runaway spreading is inhibited. Compared with liquid cooling, the immersion type cooling system provided by the invention has the advantages of shorter heat transfer path, larger cooling area, higher cooling efficiency and better cooling effect in the aspects of heat management and thermal runaway.
Drawings
Fig. 1 is an exploded view of a power battery pack according to an embodiment of the present invention;
FIG. 2 is a diagram of a coolant flow path provided by one embodiment of the present invention;
FIG. 3 is a top cover installation view provided in accordance with one embodiment of the present invention;
fig. 4 is a top view of a power battery pack according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an internal structure of a power battery pack according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of a first member according to an embodiment of the present invention;
FIG. 7 is a schematic structural view of a second member provided in accordance with an embodiment of the present invention;
wherein, 1-battery module; 2-covering the upper cover; 3, a box body; 4-a battery system distribution box; 5-a battery management system; 6-insulating layer; 7-a sealing strip; 8-bolt; 9-copper bar; 10-a deionization unit; 11-a conductive ion detection device; 12-a cross beam; 13-a first base plate; 14-a second base plate; 15-edge beam member.
Detailed Description
It is to be understood that in the description of the present invention, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be taken as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
It should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "disposed," "connected" and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; 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 invention can be understood by those of ordinary skill in the art through specific situations.
The technical solution of the present invention is further explained by the following embodiments.
In a specific embodiment, the invention provides an immersion-type cooled power battery pack, as shown in fig. 1, the power battery pack includes a battery box, a plurality of beams 12 are arranged in the battery box at intervals side by side, the beams 12 divide the internal space of the battery box into a plurality of accommodating cavities, and battery modules 1 are arranged in the accommodating cavities.
The side walls of the battery box are enclosed by two relatively parallel first side walls and two relatively parallel second side walls, and the cross beam 12 and the second side walls are parallel to each other.
A gap is reserved between two ends of the cross beam 12 and the first side walls at two sides, and a first flow channel and a second flow channel are formed along the two first side walls; the two second side walls are respectively provided with a liquid inlet close to the first flow channel and a liquid outlet close to the second flow channel, as shown in fig. 2, the liquid inlet continuously leads cooling liquid into the battery box, the cooling liquid respectively flows into different accommodating cavities through the first flow channel to soak and cool the battery module 1, and the cooling liquid is discharged from the liquid outlet through the second flow channel.
At present, the mainstream heat management mode of the power battery is liquid cooling, and the liquid cooling is longer because the heat transfer path from the battery core to the cold plate, so that the overall heat transfer resistance is larger, and in addition, when the arrangement of the battery module 1 is not regular enough, the flow channel design of the liquid cooling plate is difficult to realize the consistency of the module cooling conditions of each position, and further the system temperature difference can be increased. The invention provides a module immersion type heat management mode, wherein a battery module 1 is entirely immersed into a cooling system for cooling, a cooling liquid circulation path can be controlled through a flow channel structure design in a battery box, and cooling liquid in the system can play a role in reducing the temperature of the module when the module is out of control, so that the module is prevented from thermal runaway spreading. Compared with liquid cooling, the immersion type cooling system provided by the invention has the advantages of shorter heat transfer path, larger cooling area, higher cooling efficiency and better cooling effect in the aspects of heat management and thermal runaway.
The battery box of the present invention further includes a necessary battery system distribution box 4 (BDU) and a battery management system 5 (BMS).
Further, the battery box comprises an open box body 3 and an upper cover 2, wherein the upper cover 2 is arranged at the opening of the box body 3 in a covering mode.
Further, the box body 3 comprises a box body bottom plate and a box body boundary beam arranged along the outer edge of the box body bottom plate.
Further, the box body 3 is formed by splicing a plurality of first members and a plurality of second members, and the first members and the second members are both integrally formed profile structures.
Further, as shown in fig. 6, the first member includes the cross beam 12 and a first bottom plate 13, and the cross beam 12 and the first bottom plate 13 are perpendicular to each other to form a T-shaped structure; the first members are sequentially butted side by side along one side of the long side of the first base plate 13 to form a first assembly.
Further, as shown in fig. 7, the second member includes a side sill member 15 and a second bottom plate 14, and the second bottom plate 14 is located at one side edge of the side sill member 15 and is perpendicular to the side sill member 15; the second members are sequentially butted around the first assembly, and the boundary beam members 15 are sequentially butted and closed to form the box body boundary beam; the second bottom plate 14 is spliced with the first bottom plate 13 of the first assembly to form the box bottom plate.
Further, the long sides of the first bottom plate 13 are butted side by side in sequence and then welded and fixed to form the first assembly.
After the second members are sequentially butted around the first assembly, two end faces of the cross beam 12 of the first assembly are respectively welded and fixed with the edge beam members 15 of the second members at two sides.
After the boundary beam members 15 of the second member are sequentially abutted and closed, the abutted positions of the boundary beam members 15 are welded and fixed to form the boundary beam of the box body, and the abutted positions of the second bottom plate 14 and the first bottom plate 13 are welded and fixed to form the bottom plate of the box body.
Further, a gap is reserved between the battery module 1 and the upper cover 2, and the cooling liquid entering the box body 3 flows through the top of the battery module 1.
According to the invention, the cooling liquid circularly flows at the top of the battery module 1, and when the thermal runaway phenomenon of the battery module 1 occurs in the system, the cooling liquid at the top of the battery module 1 can reduce the temperature of the battery module 1, so that air is prevented from contacting the battery module 1, and the effect of inhibiting the thermal runaway propagation of the system is further realized.
Further, the top surface of the beam 12 is tightly attached to the inner side surface of the upper cover 2, and the tops of two adjacent accommodating cavities are isolated.
Further, as shown in fig. 3, a strip-shaped protrusion is disposed on an inner side surface of the upper cover 2, and the strip-shaped protrusion corresponds to a position of the top surface of the cross beam 12.
In the invention, the battery module 1 is wholly soaked in cooling liquid, the cooling liquid circularly flows at the top of the battery module 1, the flow direction of the cooling liquid is adjusted by designing a corresponding flow guide structure on the upper cover 2, the heat management flow channel is designed to be in a parallel connection mode, the whole flow resistance of the parallel connection mode system is small, and the flow distribution of each branch is corrected through simulation analysis.
Further, a sealing strip 7 is arranged between the strip-shaped protrusion and the top surface of the cross beam 12.
In the invention, the upper cover 2 and the box body beam 12 are fixed through the bolts 8, corresponding fixing points are designed on the box body beam 12, the upper cover 2 is fixed on the box body beam 12 through the bolts 8, the sealing strips 7 are designed on the contact surfaces of the fixing points to prevent the cooling liquid from streaming, and further the control of the upper cover 2 on the flowing direction of the cooling liquid in the box body 3 is realized.
Further, an insulating layer 6 is laid on the outer surface of the upper cover 2.
According to the invention, the heat-insulating layer 6 is laid outside the upper cover 2, so that the heat exchange between the cooling liquid inside the battery system and the external environment is reduced, and the heat transfer from the external environment to the inside of the battery pack is reduced. In the infiltration cooling process of the whole battery system, the cooling liquid circularly flows at the top of the module, the upper cover 2 plays a role in flow equalization, and the external heat preservation of the upper cover 2 is integrated to achieve the purpose of uniformly cooling the battery module 1.
Further, as shown in fig. 4, two adjacent battery modules 1 are connected by a copper bar 9, so that the battery modules 1 are connected in series or in parallel, and the copper bar 9 is soaked in the cooling liquid.
The copper bar 9 is also immersed in the cooling scheme, the requirement on the overcurrent capacity of the high-voltage copper bar 9 is higher for a high-voltage 800V battery system, the high-voltage copper bar 9 is immersed in the cooling liquid by the immersion cooling scheme, the temperature of the high-voltage copper bar 9 can be effectively reduced, the overcurrent capacity of the copper bar 9 under the same overcurrent sectional area is increased, the overcurrent sectional area of the copper bar 9 can be reduced by 20 percent under the condition of the same overcurrent capacity, the volume of the copper bar is equivalently reduced by 20 percent, and the cost is reduced.
Further, as shown in fig. 5, a deionization device 10 and a conductive ion detection device 11 are arranged inside the battery box, the deionization device 10 is used for removing conductive ions in the cooling liquid, and the conductive ion detection device 11 is used for detecting the concentration of conductive ions in the cooling liquid.
Further, the deionization unit 10 is disposed at the liquid inlet of the battery box, and the conductive ion detection unit is disposed at the liquid outlet of the battery box.
Because the module and the high-voltage copper bar 9 are wholly soaked in the cooling liquid, if the insulation performance of the cooling liquid is reduced in use, the system is very dangerous, and in order to remove conductive ions in the cooling liquid, the deionization device 10 needs to be installed in the battery box to control the ion concentration of the cooling liquid in the battery box and ensure electric insulation. Simultaneously add conductive ion detection device 11 in the battery box, the insulating nature of real-time detection coolant liquid, if the insulating nature of coolant liquid is unsatisfied the time reporting to the police when requiring, change new coolant liquid to prevent to take place danger, and then realize the effect of control coolant liquid electric conductivity. The deionization device is arranged at the inlet position of the cooling liquid in the system, the conductive ion detection device is arranged at the outlet position of the cooling liquid in the system, and the double protection realizes the insulativity of the cooling liquid in the system.
In another embodiment, the invention provides an immersion cooling method for the power battery pack, where the immersion cooling method includes:
the cooling liquid is continuously introduced into the battery box through the liquid inlet, the cooling liquid flows into different accommodating cavities through the first flow channel respectively to soak and cool the battery module 1, and the cooled cooling liquid is discharged from the liquid outlet through the second flow channel.
Further, in the process of introducing the cooling liquid, the deionization device 10 removes conductive ions in the cooling liquid, the conductive ion detection device 11 detects the concentration of the conductive ions in the cooling liquid in real time, and an alarm is triggered after the detected value exceeds a preset value.
In another embodiment, the invention provides a vehicle comprising the power battery pack.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The power battery pack is characterized by comprising a battery box, wherein a plurality of cross beams are arranged in the battery box at intervals side by side, the cross beams divide the inner space of the battery box into a plurality of accommodating cavities, and battery modules are arranged in the accommodating cavities;
the side walls of the battery box are enclosed by two opposite parallel first side walls and two opposite parallel second side walls, and the cross beam and the second side walls are parallel to each other;
gaps are reserved between the two ends of the cross beam and the first side walls on the two sides, and a first flow channel and a second flow channel are formed along the two first side walls; the two second side walls are respectively provided with a liquid inlet close to the first flow channel and a liquid outlet close to the second flow channel, the liquid inlet continuously leads cooling liquid into the battery box, the cooling liquid respectively flows into different accommodating cavities through the first flow channel to soak and cool the battery module, and the cooling liquid is discharged from the liquid outlet through the second flow channel.
2. The immersion-cooled power battery pack according to claim 1, wherein the battery box comprises an open box body and an upper cover, and the upper cover is arranged at an opening of the box body;
the box body comprises a box body bottom plate and a box body boundary beam arranged along the outer edge of the box body bottom plate.
3. The immersion-cooled power battery pack as claimed in claim 2, wherein the box body is formed by splicing a plurality of first members and a plurality of second members, and the first members and the second members are both integrally formed profile structures;
the first component comprises the cross beam and a first bottom plate, and the cross beam and the first bottom plate are perpendicular to each other to form a T-shaped structure; the first components are sequentially butted side by side along one side of the long edge of the first bottom plate to form a first assembly;
the second member comprises a side beam member and a second base plate, the second base plate is positioned on one side edge of the side beam member and is perpendicular to the side beam member; the second members are sequentially butted around the first assembly, and the boundary beam members are sequentially butted and closed to form the boundary beam of the box body; the second bottom plate and the first bottom plate of the first assembly are spliced to form the box body bottom plate.
4. The power battery pack for immersion cooling as claimed in claim 3, wherein one side of the long side of the first bottom plate is butt-jointed side by side in sequence and then welded and fixed to form the first assembly;
after the second members are sequentially butted around the first assembly, two end faces of a cross beam of the first assembly are respectively welded and fixed with the edge beam members of the second members at two sides;
after the boundary beam members of the second member are sequentially abutted and closed, the abutting joint of the boundary beam members is welded and fixed to form the boundary beam of the box body, and the abutting joint of the second bottom plate and the first bottom plate is welded and fixed to form the bottom plate of the box body.
5. The immersion-cooled power battery pack as claimed in claim 2, wherein a gap is left between the battery module and the upper cover, and the cooling liquid entering the box body flows through the top of the battery module;
the top surface of the cross beam is tightly attached to the inner side surface of the upper cover, and the tops of two adjacent accommodating cavities are isolated;
the inner side surface of the upper cover is provided with a strip-shaped bulge, and the strip-shaped bulge corresponds to the top surface of the cross beam;
a sealing strip is arranged between the strip-shaped bulge and the top surface of the cross beam;
and a heat-insulating layer is laid on the outer surface of the upper cover.
6. The power battery pack for immersion cooling as claimed in claim 1, wherein two adjacent battery modules are connected by copper bars, so that the battery modules are connected in series or in parallel, and the copper bars are immersed in the cooling liquid.
7. The power battery pack for immersion cooling according to claim 1, wherein a deionization device and a conductive ion detection device are arranged inside the battery box, the deionization device is used for removing conductive ions in the cooling liquid, and the conductive ion detection device is used for detecting the concentration of the conductive ions in the cooling liquid;
the deionization device is arranged at the liquid inlet of the battery box, and the conductive ion detection device is arranged at the liquid outlet of the battery box.
8. An immersion cooling method for a power battery pack according to any one of claims 1 to 7, wherein the immersion cooling method comprises:
the cooling liquid is continuously introduced into the battery box through the liquid inlet, the cooling liquid flows into different accommodating cavities through the first flow channel respectively to soak and cool the battery module, and the cooled cooling liquid is discharged from the liquid outlet through the second flow channel.
9. The immersion cooling method according to claim 8, wherein the deionization unit removes conductive ions from the cooling liquid during the introduction of the cooling liquid, the conductive ion detection unit detects the concentration of the conductive ions in the cooling liquid in real time, and an alarm is triggered when the detected value exceeds a preset value.
10. A vehicle, characterized in that the vehicle comprises a power battery pack according to any one of claims 1-7.
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| CN114464924B (en) | 2022-07-22 |
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