CN113594579A - Battery pack liquid cooling plate, manufacturing method thereof and battery pack - Google Patents
Battery pack liquid cooling plate, manufacturing method thereof and battery pack Download PDFInfo
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- CN113594579A CN113594579A CN202110857291.6A CN202110857291A CN113594579A CN 113594579 A CN113594579 A CN 113594579A CN 202110857291 A CN202110857291 A CN 202110857291A CN 113594579 A CN113594579 A CN 113594579A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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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
- H01M10/653—Means for temperature control structurally associated with the cells characterised by electrically insulating or thermally conductive materials
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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
- H01M10/6551—Surfaces specially adapted for heat dissipation or radiation, e.g. fins or coatings
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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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- 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
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/24—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries from their environment, e.g. from corrosion
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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
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
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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
- H01M50/244—Secondary casings; Racks; Suspension devices; Carrying devices; Holders characterised by their mounting method
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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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- 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 invention provides a liquid cooling plate of a battery pack, a manufacturing method thereof and the battery pack, wherein the liquid cooling plate comprises a bottom box, a special-shaped corrugated fin, a sealing ring, an upper cover plate and a bottom plate; the upper cover plate is arranged at the opening end of the bottom box, the bottom plate is arranged on the side wall of the bottom box, the special-shaped corrugated fin is arranged on the bottom plate, and the sealing ring is clamped between the inner side wall of the bottom box and the upper cover plate; the peripheral side wall of the bottom box is provided with a liquid inlet hole and a liquid outlet hole which are used for connecting an external pipeline. The invention not only has the battery heat dissipation function, but also has the structural function of supporting and protecting the battery module, uniformly adopts the steel plate to manufacture the liquid cooling plate, avoids the problems of difficult welding of steel and aluminum, electrochemical corrosion, poor sealing property, poor fireproof and explosion-proof performance, difficult recovery and the like, and is beneficial to reducing the processing cost of the battery liquid cooling plate.
Description
Technical Field
The invention relates to the technical field of new energy vehicle battery packs, in particular to a battery pack liquid cooling plate and a manufacturing method thereof and a battery pack, and particularly relates to a parallel multi-runner steel liquid cooling plate and a manufacturing method thereof.
Background
The new energy vehicle is the development direction of future vehicles, the battery pack is one of the key components of the new energy vehicle, and the strength, the waterproofness, the fire resistance, the corrosion resistance and the heat exchange performance of the battery pack are of great importance, so that the safety and the endurance mileage of the new energy vehicle are concerned. Through retrieval and investigation, the liquid cooling plate of the battery pack at present is mainly made of aluminum, a liquid cooling runner is manufactured through processing modes such as stamping, blowing, extrusion and the like, the liquid cooling runner is connected with a flange structure through a brazing process, and the whole liquid cooling plate is connected with a steel structural member.
Liquid-packed cold plates for aluminum batteries have the following limitations: 1. the heat exchange efficiency is low. The existing liquid cooling plate mainly uses a stamped aluminum plate, the heat dissipation area of the existing liquid cooling plate is determined by the area of a stamped pore passage, half of the heat dissipation area can be lost by the area of the stamped pore passage, and the heat exchange efficiency is low; 2. the manufacturing cost is high. Firstly, the price of aluminum is three times of that of steel, and the material cost is higher; secondly, the aluminum liquid cooling plate needs to be connected with a steel structural member, the connection process of the two materials is not mature, and the connection cost is high; 3. the safety performance is poor. Firstly, the strength of the aluminum material is low, the yield strength of the welded liquid cooling plate is only less than 100MPa, and the liquid cooling plate is easy to cause leakage of a refrigerant during bumping or impacting, so that a battery core body is corroded; secondly, the melting point of the aluminum material is low and is only 600 ℃, and the fireproof and explosion-proof performance of the aluminum material can not meet the increasingly strict design requirements of the battery pack; 4. the corrosion resistance is poor. The coolant of the battery pack liquid cooling system mainly comprises water, glycol and other solutions, the liquid cooling plate is extremely easy to corrode, and in addition, the liquid cooling plate is usually contacted or linked with a steel structural member, so that electrochemical corrosion is easily caused.
The patent document with the publication number of CN209571520U discloses a liquid cooling plate structure of a battery pack and the battery pack, which have simple structure and convenient processing, and relate to the field of electric automobile power batteries, the liquid cooling plate structure comprises an upper body and a lower body which are mutually matched and connected, a cavity for circulating cooling liquid is formed between the upper body and the lower body, two ends of the cavity are opened, and the cavity is a square cavity; a plurality of bosses are integrally formed on the bottom surface of the upper body close to the cavity side and extend towards the interior of the cavity; the boss extends from the opening at one end of the square cavity to the opening at the other end along the length direction of the liquid cooling plate; the bottom surface and the side surface of the lower body close to the cavity side are provided with heat insulation coatings for preventing heat loss. However, the patent document still has the defects of difficult welding of steel and aluminum, electrochemical corrosion, poor sealing performance, poor fire and explosion resistance and difficult recycling.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a liquid cooling plate for a battery pack, a manufacturing method of the liquid cooling plate and the battery pack.
The invention provides a liquid cooling plate for a battery pack, which comprises a bottom box, a special-shaped corrugated fin, a sealing ring, an upper cover plate and a bottom plate, wherein the bottom box is provided with a plurality of grooves;
the upper cover plate is arranged at the opening end of the bottom box, the bottom plate is arranged on the side wall of the bottom box, the special-shaped corrugated fin is arranged on the bottom plate, and the sealing ring is clamped between the inner side wall of the bottom box and the upper cover plate;
and a liquid inlet hole and a liquid outlet hole which are used for connecting an external pipeline are formed in the peripheral side wall of the bottom box.
Preferably, the special-shaped corrugated fin is a trapezoidal corrugated fin with a uniform cross section, and two ends of the special-shaped corrugated fin are respectively provided with a lug.
Preferably, the upper cover plate is a steel flat plate, and the upper cover plate is arranged on the bottom box through flange connection.
Preferably, the sealing ring is in interference fit with the upper cover plate and the bottom box through grooves.
The invention also provides a manufacturing method of the liquid cooling plate wrapped by the battery, which comprises the following steps:
a forming step of the bottom box, namely, taking a steel plate as a raw material, firstly leveling the steel plate, further performing prefabricated blanking on a liquid inlet hole and a liquid outlet hole, and further performing deep drawing through a stamping die to form a box shape;
the forming step of the special-shaped corrugated fin is manufactured by adopting a stamping forming process or a roll bending forming process;
the forming step of the upper cover plate, namely leveling and cutting by taking a steel plate as a raw material;
and a liquid cooling plate connecting step, wherein the components of the liquid cooling plate are connected by adopting a brazing or sealing fastening connecting mode.
Preferably, in the step of forming the special-shaped corrugated fin, the stamping process specifically includes: and discharging and leveling the ultrathin steel coil, and feeding the ultrathin steel coil into a one-step configured punching machine for blanking and punching forming.
Preferably, in the step of forming the special-shaped corrugated fin, the roll bending forming process specifically includes: the method comprises the steps of feeding and leveling an ultrathin steel coil, feeding the ultrathin steel coil into a roll bending forming machine, gradually bending the steel strip into a corrugated shape through a plurality of pairs of rollers which are sequentially configured, and further blanking two ends of a corrugated fin into a special-shaped structure which is centrosymmetric in a blanking machine which is configured subsequently.
Preferably, in the step of connecting the liquid cooling plates, the brazing connection mode is specifically as follows: firstly, coating brazing filler metal on the connecting position of the bottom box and the special-shaped corrugated fin, assembling and clamping through a tool, and further placing the liquid cooling plate into a brazing furnace for brazing connection;
preferably, in the step of connecting the liquid cooling plates, the sealing and fastening connection mode is specifically as follows: and installing the sealing ring at a matching position, and installing bolts and nuts at the flange surfaces of the upper cover plate and the bottom box to fasten the upper cover plate and the bottom box.
The invention also provides a battery pack which comprises the battery pack liquid cooling plate.
Compared with the prior art, the invention has the following beneficial effects:
1. the battery pack liquid cooling plate has the battery heat dissipation function and the structural function of supporting and protecting the battery module, uniformly adopts the steel plate to manufacture the liquid cooling plate, avoids the problems of difficult welding of steel and aluminum, electrochemical corrosion, poor sealing property, poor fireproof and explosion-proof performance, difficult recovery and the like, and is beneficial to reducing the processing cost of the battery pack liquid cooling plate;
2. the invention adopts a three-layer structure of the bottom box, the corrugated fins and the upper cover plate, wherein both sides of the corrugated fins are flow channels, and compared with the existing aluminum stamping structure, the invention has the advantages of large heat dissipation area and high heat exchange efficiency;
3. the liquid cooling plate is made of the steel plate, and compared with an aluminum liquid cooling plate, the material cost is reduced by more than one third;
4. the whole battery pack adopts a steel structure, avoids the electrochemical corrosion problem of the traditional steel-aluminum hybrid battery pack, adopts stainless steel materials, and improves the corrosion resistance by more than 5 times compared with the traditional aluminum liquid cooling plate;
5. the liquid cooling plate manufacturing method is easy to realize batch continuous production, and the production efficiency is greatly improved compared with the prior art;
6. the steel liquid cooling plate obtained by the invention can directly replace a battery pack chassis, plays a role in structural support, and greatly improves the fireproof, waterproof and anti-collision performance of the battery pack.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic view of a combination structure of a liquid cooling plate wrapped by a steel battery according to the present invention;
FIG. 2 is a schematic structural diagram of a bottom case of a liquid cooling plate wrapped steel battery according to the present invention;
FIG. 3 is a schematic structural diagram of a special-shaped corrugated fin of a liquid cooling plate wrapped with a steel battery according to the present invention;
FIG. 4 is a schematic structural diagram of an upper cover plate of a liquid-cooled plate of a steel battery pack according to the present invention;
FIG. 5 is a partial schematic view of a seal ring structure of a liquid cooling plate wrapped with a steel battery according to the present invention.
The figures show that:
Bottom plate 4 uniform section trapezoidal corrugation 10
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1 to 5, the battery pack liquid cooling plate provided by the invention comprises a bottom box 1, special-shaped corrugated fins 2, a sealing ring 11, an upper cover plate 3 and a bottom plate 4, wherein the upper cover plate 3 is arranged at the opening end of the bottom box 1, the bottom plate 4 is arranged on the side wall 8 of the bottom box 1, the special-shaped corrugated fins 2 are arranged on the bottom plate 4, the sealing ring 11 is clamped between the inner side wall of the bottom box 1 and the upper cover plate 3, and the peripheral side wall of the bottom box 1 is provided with a liquid inlet hole 5 and a liquid outlet hole 6 for connecting an external pipeline.
The special-shaped corrugated fin 2 is a trapezoidal corrugated fin 10 with a uniform cross section, and two ends of the special-shaped corrugated fin 2 are respectively provided with a lug 9.
The upper cover plate 3 is a steel flat plate, and the upper cover plate 3 is connected and arranged on the bottom box 1 through a flange 7.
The sealing ring 11 is in interference fit with the upper cover plate 3 and the bottom box 1 through the grooves.
The invention also provides a manufacturing method of the liquid cooling plate wrapped by the battery, which comprises the following steps:
a forming step of the bottom box, namely, taking a steel plate as a raw material, firstly leveling the steel plate, further performing prefabricated blanking on a liquid inlet hole 5 and a liquid outlet hole 6, and further performing deep drawing through a stamping die to form a box shape;
and the step of forming the special-shaped corrugated fin is manufactured by adopting a stamping forming process or a roll bending forming process. In the forming step of the special-shaped corrugated fin, the stamping forming process specifically comprises the following steps: discharging and leveling the ultrathin steel coil, and feeding the ultrathin steel coil into a one-time configured punching machine for blanking and punching forming; in the forming step of the special-shaped corrugated fin, the roll bending forming process specifically comprises the following steps: the method comprises the following steps of (1) discharging and leveling an ultrathin steel coil, feeding the ultrathin steel coil into a roll bending forming machine, gradually bending the steel strip into a corrugated shape through a plurality of pairs of rollers which are sequentially configured, and further blanking two ends of a corrugated fin into a special-shaped structure which is centrosymmetric in a blanking machine which is configured subsequently;
the forming step of the upper cover plate, namely leveling and cutting by taking a steel plate as a raw material;
a liquid cooling plate connecting step, wherein the components of the liquid cooling plate are connected by adopting a brazing or sealing fastening connecting mode; in the liquid cooling plate connecting step, the brazing connecting mode is as follows: firstly, coating brazing filler metal on the connecting position of a bottom box 1 and a special-shaped corrugated fin 2, assembling and clamping through a tool, and further placing a liquid cooling plate into a brazing furnace for brazing connection; the sealing and fastening connection mode is as follows: the sealing ring 11 is arranged at the matching position, and bolts and nuts are arranged at the surfaces of the upper cover plate 3 and the flange 7 of the bottom box 1 to fasten the two.
The invention also provides a battery pack which comprises the battery pack liquid cooling plate.
Preferred embodiment(s) of the invention：
A liquid cooling plate for a steel battery pack comprises a steel square bottom box, a steel or plastic special-shaped corrugated fin, a sealing ring and a steel upper cover plate.
The steel square bottom box is a semi-closed square shell, a flange on the bottom box is connected with the upper cover plate, a liquid inlet hole and a liquid outlet hole are formed in the side surface of the bottom box and are connected with an external pipeline of the liquid cooling plate, and the steel square bottom box plays a role in accommodating a refrigerant and supporting the bottom structure of the battery pack; the special-shaped corrugated fin is arranged on the bottom side wall 8 of the bottom box, the special-shaped corrugated fin is a steel special-shaped corrugated fin or a plastic special-shaped corrugated fin, the steel special-shaped corrugated fin is a trapezoidal corrugated fin 10 with a constant cross section, special-shaped notches and lugs are reserved at two ends of the steel special-shaped corrugated fin, and the plastic special-shaped corrugated fin is the same as the steel special-shaped corrugated fin in shape; the corrugated fins, the bottom box and the upper cover plate form a plurality of micro flow channels of the refrigerant, and the special-shaped gaps play a role in converging the refrigerant; the corrugated fins are alternately arranged on the bottom box in a positive and negative direction, the lugs of the corrugated plates play a role in blocking a refrigerant channel, and the refrigerant channel can be designed in a layout mode through the arrangement of the corrugated fins; after the corrugated fin is assembled with the bottom box, the top of the corrugated fin is flush with a flange at the top of the bottom box; the upper cover plate is a steel flat plate and is assembled and connected with a flange at the top of the bottom box; the sealing ring is a rubber ring with a circular cross section, and has a sealing effect by causing contact pressure on a sealing contact surface through interference fit; the sealing ring is in interference fit with a square groove between the upper cover plate and the bottom box, and the square groove is positioned on the inner side of the flange surface.
The special-shaped corrugated fin has a central symmetrical structure; the water inlet and the water outlet in the steel bottom box are arranged on the same side of the side wall of the bottom box; the battery pack liquid cooling plate is formed by assembling at least 8 groups of special-shaped corrugated fins; the total height of the liquid cooling plate of the battery pack is not more than 10 mm; all three parts of the battery pack liquid cooling plate are made of 304 stainless steel materials; the sealing ring is made of nitrile-butadiene 70 rubber material.
The manufacturing method of the liquid cooling plate based on the battery steel package comprises the following steps:
and 2, forming the special-shaped corrugated fin, wherein the steel special-shaped corrugated fin is manufactured by adopting a stamping forming process or a roll bending forming process. The stamping forming process comprises the steps of placing and leveling the ultrathin steel coil, and feeding the ultrathin steel coil into a one-time configured stamping machine for blanking and stamping forming; the roll bending forming process comprises the steps of feeding and leveling an ultrathin steel coil, feeding the ultrathin steel coil into a roll bending forming machine, gradually bending the steel coil into a corrugated shape through a plurality of pairs of rollers which are sequentially configured, and further blanking two ends of a corrugated fin into a special-shaped structure which is centrosymmetric in a blanking machine which is configured subsequently; the plastic special-shaped corrugated fin is manufactured by adopting an injection molding process;
and 4, connecting the liquid cooling plates in a brazing or sealing fastening connection mode. The brazing connection mode is that firstly, brazing filler metal is coated on the connection position of the bottom box and the corrugated fin, assembling and clamping are carried out through a tool, and further, the liquid cooling plate is placed into a brazing furnace for brazing connection; and in the sealing and fastening connection mode, the sealing ring is arranged at a matching position, and bolts and nuts are arranged on the flange surfaces of the upper cover plate and the bottom box to fasten the upper cover plate and the bottom box.
The metal strip coil is made of 304 stainless steel, and the brazing filler metal is made of copper foil or nickel foil. The manufacturing process of the liquid cooling plate can be completely automatic, forming processing is mainly realized through stamping and rolling processes, and connection between parts is realized through automatic tunnel brazing and bolt and nut assembly.
The battery steel-clad liquid cooling plate and the manufacturing method thereof provided by the embodiment have the advantages that the production efficiency is high, the processing cost is low, the full automation can be realized, the batch production of liquid cooling plate parts can be realized through a roll bending and stamping production line, and the automatic connection of the parts is realized through a tunnel brazing furnace; the liquid-filled cold plate for the steel battery produced by the invention has strong corrosion resistance, high structural strength and strong fire resistance, and can resist the high temperature of more than 1000 ℃. The metal strip that this embodiment adopted rolls up to be the steel sheet similar with steel battery package structure, compares traditional steel aluminium hybrid battery package, has avoided steel-aluminium electrochemical corrosion.
The invention adopts a steel plate to obtain a liquid cooling plate bottom box through a stamping process, adopts a roll bending forming process or a stamping forming process to obtain a steel special-shaped corrugated plate, adopts an injection molding process to prepare the plastic special-shaped corrugated plate, and adopts a brazing or sealing fastening connection mode to connect the whole liquid cooling plate. The invention effectively increases the heat dissipation area of the liquid cooling plate and has higher heat exchange efficiency. The invention not only has the battery heat dissipation function, but also has the structural function of supporting and protecting the battery module, uniformly adopts the steel plate to manufacture the liquid cooling plate, avoids the problems of difficult welding of steel and aluminum, electrochemical corrosion, poor sealing property, poor fireproof and explosion-proof performance, difficult recovery and the like, and is beneficial to reducing the processing cost of the battery liquid cooling plate.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience in describing the present application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present application.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. A liquid cooling plate for a battery pack is characterized by comprising a bottom box (1), special-shaped corrugated fins (2), a sealing ring (11), an upper cover plate (3) and a bottom plate (4);
the upper cover plate (3) is arranged at the opening end of the bottom box (1), the bottom plate (4) is arranged on the side wall (8) of the bottom box (1), the special-shaped corrugated fin (2) is arranged on the bottom plate (4), and the sealing ring (11) is clamped between the inner side wall of the bottom box (1) and the upper cover plate (3);
and a liquid inlet hole (5) and a liquid outlet hole (6) which are used for connecting an external pipeline are formed in the peripheral side wall of the bottom box (1).
2. The liquid cooling plate for the battery pack according to claim 1, wherein the special-shaped corrugated fin (2) is a trapezoidal corrugated fin (10) with a constant cross section, and lugs (9) are respectively arranged at two ends of the special-shaped corrugated fin (2).
3. The liquid cooling plate of the battery pack as claimed in claim 1, wherein the upper cover plate (3) is a steel flat plate, and the upper cover plate (3) is connected and arranged on the bottom case (1) through a flange (7).
4. The liquid cooling plate of the battery pack according to claim 1, wherein the sealing ring (11) is in interference fit with the upper cover plate (3) and the bottom case (1) through a groove.
5. A method for manufacturing a liquid-cooled plate of a battery pack according to any one of claims 1 to 4, wherein the method comprises the following steps:
the forming step of the bottom box, which takes a steel plate as a raw material, firstly levels the steel plate, further performs prefabricated blanking on the liquid inlet hole (5) and the liquid outlet hole (6), and further performs deep-drawing through a stamping die to form a box shape;
the forming step of the special-shaped corrugated fin is manufactured by adopting a stamping forming process or a roll bending forming process;
the forming step of the upper cover plate, namely leveling and cutting by taking a steel plate as a raw material;
and a liquid cooling plate connecting step, wherein the components of the liquid cooling plate are connected by adopting a brazing or sealing fastening connecting mode.
6. The manufacturing method according to claim 5, wherein in the step of forming the special-shaped corrugated fin, the stamping process is specifically as follows: and discharging and leveling the ultrathin steel coil, and feeding the ultrathin steel coil into a one-step configured punching machine for blanking and punching forming.
7. The manufacturing method according to claim 5, wherein in the step of forming the special-shaped corrugated fin, the roll bending forming process is specifically as follows: the method comprises the steps of feeding and leveling an ultrathin steel coil, feeding the ultrathin steel coil into a roll bending forming machine, gradually bending the steel strip into a corrugated shape through a plurality of pairs of rollers which are sequentially configured, and further blanking two ends of a corrugated fin into a special-shaped structure which is centrosymmetric in a blanking machine which is configured subsequently.
8. The manufacturing method according to claim 5, wherein in the liquid-cooled plate joining step, the brazing joining method is specifically: firstly, coating brazing filler metal on the connecting position of the bottom box (1) and the special-shaped corrugated fin (2), assembling and clamping through a tool, and further placing the liquid cooling plate into a brazing furnace for brazing connection.
9. The manufacturing method according to claim 5, wherein in the liquid-cooled plate connecting step, the sealing and fastening connection is implemented by: and (3) installing the sealing ring (11) at a matching position, and installing bolts and nuts at the surfaces of the upper cover plate (3) and the flange (7) of the bottom box (1) to fasten the upper cover plate and the bottom box.
10. A battery pack comprising a liquid-cooled plate of a battery pack as claimed in any one of claims 1 to 4.
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| CN210272607U (en) * | 2019-08-20 | 2020-04-07 | 豫新汽车热管理科技有限公司 | Biplane cooled liquid cooling plate |
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| CN112397806A (en) * | 2019-08-19 | 2021-02-23 | 格朗吉斯铝业（上海）有限公司 | Battery cold plate integrating heating function, power battery system and new energy vehicle |
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| JPS63232271A (en) * | 1987-03-20 | 1988-09-28 | Toshiba Corp | Manufacture of cooling plate for fuel cell of fused carbonate |
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| US20110293982A1 (en) * | 2010-05-28 | 2011-12-01 | Gm Global Technology Operations, Inc. | Corrugated fin and frame assembly for battery cooling |
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| CN113594579B (en) | 2023-09-05 |
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