CN115020862A - Battery shell, manufacturing method and power battery - Google Patents

Battery shell, manufacturing method and power battery Download PDF

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Publication number
CN115020862A
CN115020862A CN202210752909.7A CN202210752909A CN115020862A CN 115020862 A CN115020862 A CN 115020862A CN 202210752909 A CN202210752909 A CN 202210752909A CN 115020862 A CN115020862 A CN 115020862A
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CN
China
Prior art keywords
shell plate
inner shell
battery
plate
outer shell
Prior art date
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Pending
Application number
CN202210752909.7A
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Chinese (zh)
Inventor
汤勇
赵威
张仕伟
刘德荣
余小媚
黄梓滨
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Guangdong Changnengda Technology Development Co ltd
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Guangdong Changnengda Technology Development Co ltd
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Priority to CN202210752909.7A priority Critical patent/CN115020862A/en
Publication of CN115020862A publication Critical patent/CN115020862A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/613—Cooling or keeping cold
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/61—Types of temperature control
    • H01M10/617—Types of temperature control for achieving uniformity or desired distribution of temperature
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—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
    • 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
    • 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
    • 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
    • H01M10/6561—Gases
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6567—Liquids
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/60—Heating or cooling; Temperature control
    • H01M10/65—Means for temperature control structurally associated with the cells
    • H01M10/656—Means for temperature control structurally associated with the cells characterised by the type of heat-exchange fluid
    • H01M10/6569—Fluids undergoing a liquid-gas phase change or transition, e.g. evaporation or condensation
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention discloses a battery shell, a manufacturing method and a power battery, wherein the battery shell comprises an inner shell plate and a cavity body, wherein the inner shell plate is provided with a cavity body for accommodating a battery core; the outer shell plate is arranged at the periphery of the inner shell plate in a wrapping mode, and a sealed space is enclosed between the outer shell plate and the inner shell plate; the grooves are arranged on the inner shell plate and used as an air passage structure in the sealed space; and the liquid absorption core is arranged on the shell plate so as to directly radiate and equalize the temperature of the battery cell in the sealed space. Through interior casing board and the outer casing board direct replacement battery plastic-aluminum shell, can effectively reduce the thermal resistance of solid fixed contact surface, make the heat more directly transmit away, the local high temperature of efficient reduction battery more, and through form confined space and can fill the liquid phase between outer casing board and interior casing board, the wick setting is inside confined space, the slot is as the air flue structure, take away the heat through liquid evaporation and condensation, and realize the liquid backward flow through the wick, thereby make the gas-liquid circulation can go on repeatedly, the continuation of heat transfer is maintained.

Description

Battery shell, manufacturing method and power battery
Technical Field
The invention relates to the technical field of power battery heat dissipation, in particular to a battery shell, a manufacturing method and a power battery.
Background
The battery self heat conductivity is low, the condition that the heat in the battery can not be led out in time exists, and the battery local heating is serious when the thermal runaway of the battery, so that the battery can react out of control until the battery burns to cause fire. Therefore, the safety of the conventional power battery cannot be met, and the battery of the electric vehicle frequently generates smoke, fire and even explosion accidents.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a battery shell which can conduct heat equalization management on all areas of a battery through a phase change heat transfer technology.
The invention also provides a manufacturing method of the battery shell.
The invention also provides a power battery comprising the battery shell.
According to a first aspect embodiment of the present invention, a battery case includes:
the inner shell plate is provided with a cavity for accommodating the battery core;
the outer shell plate is arranged on the periphery of the inner shell plate in a wrapping mode, and a sealed space is defined between the outer shell plate and the inner shell plate;
the grooves are arranged on the inner shell plate and used as air channel structures in the sealed space;
and the liquid absorbing core is arranged on the shell plate so as to directly radiate and equalize the temperature of the battery cell in the sealed space.
According to the battery shell of the embodiment of the first aspect of the invention, at least the following beneficial effects are achieved: through interior shell plate and the shell plate directly replace battery plastic-aluminum shell, can effectively reduce the thermal resistance of solid fixed contact surface, make more direct pass through as the interior shell plate and the shell plate transmission of soaking pit of heat away, the local high temperature of more efficient reduction battery, and through form confined space and can fill the liquid phase between shell plate and interior shell plate, the imbibition core sets up inside confined space, the slot is as the air flue structure, take away the heat through liquid evaporation and condensation, and realize the liquid backward flow through the imbibition core, thereby make the gas-liquid circulation can repeat, the continuation of maintaining heat transfer.
According to the battery case of the embodiment of the first aspect of the invention, the grooves include longitudinal grooves and multi-directional grooves, each of the longitudinal grooves is arranged on each side wall of the inner shell plate, each of the multi-directional grooves is arranged on the bottom of the inner shell plate, and the multi-directional grooves serve as working medium pools and are communicated with each of the longitudinal grooves.
According to the battery case of the embodiment of the first aspect of the present invention, each of the longitudinal grooves is arranged at intervals in the length direction of the inner case plate, part of the multi-directional grooves is arranged in the width direction of the inner case plate, part of the multi-directional grooves is arranged in the thickness direction of the inner case plate, and the multi-directional grooves are communicated with each other.
According to the battery shell of the embodiment of the first aspect of the present invention, at least one of the longitudinal grooves or the multi-directional grooves is formed by stamping, extruding or multi-surface etching.
According to the battery shell provided by the embodiment of the first aspect of the invention, the top end of the inner shell plate is provided with the flange structure, the inner shell plate is connected with the outer shell plate through the flange structure in a welding manner, and the bottom of the inner shell plate is connected with the bottom of the outer shell plate through the welding manner.
According to the battery shell of the embodiment of the first aspect of the invention, the material of the inner shell plate and the material of the outer shell plate are copper or aluminum, and the thickness is 0.1-1 mm.
According to the battery shell provided by the embodiment of the first aspect of the invention, the thickness dimension of the side wall of the battery shell is 0.2-2 mm, and the overall thermal conductivity is more than 1000W/(K.m).
According to the battery shell provided by the embodiment of the first aspect of the invention, the liquid absorbing core is a silk net or a woven bag, and the liquid absorbing core is tightly attached to the surface of the outer shell plate.
A method of manufacturing a battery case according to an embodiment of the second aspect of the invention includes the steps of:
pressing two thin aluminum plates into an outer shell plate and an inner shell plate respectively by utilizing punch forming;
extruding the groove on the outer wall of the inner shell plate in an extruding mode;
cutting the shape and size of the bottom and the four side walls of the outer shell plate by using a laser marking machine, bending the outer shell plate into the shape of the outer shell plate, and tightly attaching the outer shell plate;
automatically spraying solder on the lower surface of the flange at the top of the inner shell plate by using a dispenser, manually spraying the solder on the bottom of the inner shell plate, connecting the inner shell plate with the outer shell plate attached with the silk screen, and sintering the outer shell plate in a high-temperature furnace at 550 ℃;
the working medium deionized water is poured into the soaking plate by using an injector, then the inside of the soaking plate is vacuumized by using a vacuum machine, and then the opening is nipped off.
According to the power battery of the embodiment of the third aspect of the invention, the power battery comprises: a battery housing according to an embodiment of the first aspect of the invention.
It is understood that the manufacturing method of the battery case in the second aspect of the present invention and the power battery in the third aspect of the present invention have the technical effects of the battery case in the first aspect of the present invention, and therefore, the detailed description is omitted.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described below with reference to the accompanying drawings and examples;
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is an exploded view of an embodiment of the present invention.
Reference numerals:
outer shell plate 1, interior shell plate 2, wick 3, slot 4.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention and are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality is one or more, the meaning of a plurality is at least two, and larger, smaller, larger, etc. are understood as excluding the present number, and larger, smaller, inner, etc. are understood as including the present number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
Referring to fig. 1 to 2, a battery case according to an embodiment of the present invention is applied to a power battery, and includes an inner case 2, an outer case 1, a plurality of grooves 4, and a wick 3.
The battery cell comprises an inner shell plate 2, an outer shell plate 1, a battery cell and a battery cover, wherein the inner shell plate 2 is provided with a cavity for accommodating the battery cell, the outer shell plate 1 is arranged on the periphery of the inner shell plate 2 in a coating mode, and a sealed space is enclosed between the outer shell plate 1 and the inner shell plate 2; it can be understood that the inner wall of the inner shell 2 encloses a cavity for wrapping the battery core, the outer wall of the inner shell 2 encloses a side wall of the sealed space with the inner wall of the outer shell 1, and the bottom and the top of the inner shell 2 and the top of the outer shell 1 are respectively tightly connected to form two ends of the matched sealed space. Wherein each groove 4 is arranged on the inner shell plate 2 to be used as an air channel structure in the sealed space; the wick 3 is arranged on the shell plate 1 to directly radiate the battery core and equalize the temperature in the sealed space. Through interior casing 2 and 1 direct substitution battery plastic-aluminum shells of casing, can effectively reduce the thermal resistance of solid fixed contact surface, make the more direct interior casing 2 and the 1 transmission of casing that pass through as the soaking pit of heat, the local high temperature of more efficient reduction battery, and through form confined space and can fill the liquid phase between casing 1 and interior casing 2, imbibition core 3 sets up inside confined space, slot 4 is as the air flue structure, take away the heat through liquid evaporation and condensation, and realize the liquid backward flow through imbibition core 3, thereby make the gas-liquid circulation can go on repeatedly, the continuation of maintaining heat transfer.
It can be understood that when the battery is overcharged and overdischarged, even when more dangerous conditions such as extrusion occur, the technology of phase change heat transfer to conduct heat management on all regions of the battery is a reliable solution for solving the extreme thermal runaway of the battery. Phase change heat transfer component is like the soaking plate, carries out efficient heat transfer through liquid vapour phase transition latent heat in the vacuum cavity, takes away the heat through liquid evaporation and condensation, and realize the liquid backward flow through capillary wick, thereby make the gas-liquid circulation can go on repeatedly, maintain the continuation of heat transfer, but the application of soaking plate technique in the battery field, mainly concentrate on for the soaking cooling on battery surface, common generally pastes the soaking plate on the battery surface, avoid the battery local high temperature to appear and lead to the thermal runaway situation. However, the latex of the battery can reduce the quality and energy density of the battery module, and the soaking plate cannot directly contact the battery core, so that the thermal control efficiency is reduced, and the thermal management requirement may not be met in the case of extreme conditions.
Therefore, in some embodiments of the invention, the inner shell plate 2 and the outer shell plate 1 are used as vapor chambers for vapor heat distribution and temperature reduction on the surface of the battery, the phase-change heat transfer shell adopts a shell type vapor chamber with enhanced capillary performance and phase-change characteristics, and the aluminum-plastic shell of the battery cell is replaced by the ultrathin vapor chamber shell by using the ultrathin vapor chamber technology, so that the battery is directly contacted with the vapor chamber, the heat dissipation and the temperature equalization are directly performed on the internal cell structure, and the efficient heat management of the power battery is realized.
In some embodiments of the present invention, the grooves 4 include longitudinal grooves and multi-directional grooves, each longitudinal groove is disposed on each side wall of the inner shell plate 2, each multi-directional groove is disposed at the bottom of the inner shell plate 2, and the multi-directional grooves serve as working fluid pools and communicate with each longitudinal groove. It can be understood that, the top of the inner shell plate 2 is used for being tightly connected with the outer shell plate 1, and then each longitudinal groove is uniformly distributed on each side surface of the inner shell plate 2, and the multidirectional grooves are distributed at the bottom of the inner shell plate 2, and the multidirectional grooves are arranged to penetrate through each side surface of the inner shell plate 2 along the multidirectional direction, so that each longitudinal groove is communicated with each multidirectional groove, and the liquid phase filled in the sealed space can flow, and the uniformity and the rapidness of liquid backflow are ensured.
Preferably, the longitudinal grooves are arranged at intervals along the length direction of the inner shell plate 2, part of the multi-directional grooves are arranged along the width direction of the inner shell plate 2, part of the multi-directional grooves are arranged along the thickness direction of the inner shell plate 2, and the multi-directional grooves are communicated with each other. The multi-directional grooves are arranged at the bottom of the shell to be bidirectional grooves which face to the front and back and the left and right, are communicated with the longitudinal grooves of the side wall and serve as working medium pools to provide working medium transmission for the side wall.
In some embodiments of the invention, the longitudinal grooves are rectangular grooves with a width of 6mm, a top width of 5mm and a depth of 0.2 mm. At least one of the longitudinal grooves or the multi-directional grooves is processed and formed by stamping, extruding or multi-surface etching.
In some embodiments of the present invention, the top end of the inner shell 2 is provided with a flange structure, the inner shell 2 is welded to the outer shell 1 via the flange structure, and the bottom of the inner shell 2 is welded to the bottom of the outer shell 1. The welded connection of the inner skin 2 to the outer skin 1 can be achieved by a soldered connection. Specifically, the top of the groove 4 of the four side walls in the inner shell plate 2 is provided with a flange structure which is used as a supporting structure and is tightly connected with the four side walls of the outer shell plate 1, the middle part of the flange structure clamps and fixes one end of a silk screen, the rest part of the silk screen is tightly attached to the outer shell plate 1, and the bottom of the inner shell plate 2 is connected with the bottom of the outer shell plate 1 through welding. The flange at the top of the inner shell plate 2 is parallel to the bottom of the inner shell plate 2, the width dimension of the outer edge of the flange is consistent with that of the outer shell plate 1, and the flange is connected with the top of the outer shell plate 1 through the lower surface in a welding mode.
In some embodiments of the present invention, the wick 3 is a microstructure having super-hydrophilic characteristics, such as a wire mesh or a woven bag, and in some embodiments, the wick 3 is formed by sintering a single-layer wire mesh having a thickness of 0.1mm, and after the wick 3 is tightly attached to the surface of the outer shell plate 1, the inner shell plate 2 and the outer shell plate 1 are welded and connected together, and the wire mesh is fixed.
In some embodiments of the present invention, the material of the inner shell plate 2 and the outer shell plate 1 is copper or aluminum, and the thickness is 0.1 to 1mm, that is, the thickness of the outer shell plate 1 is 0.1mm, and the thickness of the inner shell plate 2 is 0.1mm, and the shell shape is formed by stamping. In some embodiments, the thickness of the side wall of the battery case is 0.2-2 mm, and the overall thermal conductivity is more than 1000W/(K.m). Specifically, the overall size of the battery case was 90 × 150 × 15mm, and the thickness of the case side wall was 0.5 mm.
Referring to fig. 1 to 2, the method for manufacturing a battery case according to the embodiment of the invention can be used for manufacturing the battery case according to the embodiment of the invention, so that the ultra-thin soaking plate is combined with the aluminum-plastic shell of the battery, the battery is in direct contact with the soaking plate, and efficient thermal management of the power battery is realized.
The manufacturing method of the battery case comprises the following steps:
pressing two thin aluminum plates into an outer shell plate 1 and an inner shell plate 2 respectively by utilizing punch forming;
extruding the groove 4 on the outer wall of the inner shell plate 2 in an extruding mode;
cutting the shape and size of the bottom and the four side walls of the shell plate 1 from a silk screen by using a laser marking machine, bending the shell plate into the shape of the shell plate 1, and then closely attaching the shell plate 1;
automatically spraying solder on the lower surface of the top flange of the inner shell plate 2 by using a dispenser, manually spraying the solder on the bottom of the inner shell plate 2, connecting the inner shell plate with the outer shell plate 1 attached with the silk screen, and sintering the outer shell plate in a high-temperature furnace at 550 ℃;
the working medium deionized water is poured into the soaking plate by using an injector, then the inside of the soaking plate is vacuumized by using a vacuum machine, and then the opening is nipped off. Specifically, when the vacuum degree in the cavity is below 7Pa, the seal is immediately cut off.
In other embodiments, the wire mesh is formed by sintering a double-layer wire mesh with the thickness of 0.06mm, meanwhile, the outer shell plate 1 is formed by punching an aluminum plate with the thickness of 0.08mm, a layer of 200-mesh dendritic copper powder is uniformly paved in the groove 4 on the side wall of the inner shell plate 2, and the wire mesh is sintered at high temperature of 960 ℃. In other embodiments, the air channel structure of the inner shell plate 2 may also adopt an array point column structure.
It can be understood that the phase-change heat transfer technology is adopted, the phase-change heat transfer soaking plate is different from the traditional air cooling and direct water cooling inefficiencies, and has good heat transfer performance and temperature equalization performance. The invention adopts the ultrathin soaking plate technology as a support, effectively avoids the great increase of the volume and the weight of the battery module on the premise of ensuring the basic performance of the soaking plate, and simultaneously greatly reduces the material cost and the manufacturing cost. The ultrathin soaking plate directly replaces the aluminum-plastic shell of the battery, so that the thermal resistance of the solid-solid contact surface can be effectively reduced, heat is more directly transferred out through the soaking plate, and the local high temperature of the battery is more efficiently reduced. The heat-conducting shell material for the power battery can be directly used as a basic container or a mould in the manufacturing process of the battery in actual production and processing, so that the stepwise and substitutable properties of battery manufacturing are realized, and the more efficient and convenient battery manufacturing process is realized.
Referring to fig. 1 to 2, in the power battery according to the third aspect of the present invention, the power battery may be an electric vehicle battery, and the power battery includes the battery case according to the first aspect of the present invention, and the aluminum-plastic case of the battery cell is replaced by the ultra-thin vapor chamber case by using the ultra-thin vapor chamber technology, so as to directly dissipate heat and equalize temperature of the internal cell structure, thereby achieving efficient thermal management of the power battery, and thus meeting the thermal management requirements in the case of extreme conditions.
The technical features of the embodiments described above can 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 embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (10)

1. A battery case, comprising:
the inner shell plate is provided with a cavity for accommodating the battery core;
the outer shell plate is arranged on the periphery of the inner shell plate in a wrapping mode, and a sealed space is defined between the outer shell plate and the inner shell plate;
the grooves are arranged on the inner shell plate and used as air channel structures in the sealed space;
and the liquid absorbing core is arranged on the shell plate so as to directly radiate and equalize the temperature of the battery cell in the sealed space.
2. The battery case of claim 1, wherein: the grooves comprise longitudinal grooves and multi-directional grooves, each longitudinal groove is arranged on each side wall of the inner shell plate, each multi-directional groove is arranged at the bottom of the inner shell plate, and the multi-directional grooves serve as working medium pools and are communicated with the longitudinal grooves.
3. The battery case according to claim 2, wherein: the longitudinal grooves are arranged at intervals along the length direction of the inner shell plate, part of the multi-directional grooves are arranged along the width direction of the inner shell plate, part of the multi-directional grooves are arranged along the thickness direction of the inner shell plate, and the multi-directional grooves are communicated with each other.
4. The battery case according to claim 2 or 3, characterized in that: at least one of the longitudinal grooves or the multi-directional grooves is processed and formed in a stamping, extruding or multi-surface etching mode.
5. The battery case of claim 1, wherein: the top end of the inner shell plate is provided with a flange structure, the inner shell plate is connected with the outer shell plate in a welding mode through the flange structure, and the bottom of the inner shell plate is connected with the bottom of the outer shell plate in a welding mode.
6. The battery case of claim 1, wherein: the inner shell plate and the outer shell plate are made of copper or aluminum, and the thickness of the inner shell plate and the outer shell plate is 0.1-1 mm.
7. The battery case of claim 1, wherein: the thickness of the side wall of the battery shell is 0.2-2 mm, and the overall thermal conductivity is more than 1000W/(K.m).
8. The battery case of claim 1, wherein: the liquid absorption core is a silk screen or a woven bag, and the liquid absorption core is tightly attached to the surface of the outer shell plate.
9. A method of manufacturing a battery case, comprising the steps of:
pressing two thin aluminum plates into an outer shell plate and an inner shell plate respectively by utilizing punch forming;
extruding the groove on the outer wall of the inner shell plate in an extruding mode;
cutting the shape and size of the bottom and the four side walls of the outer shell plate by using a laser marking machine, bending the outer shell plate into the shape of the outer shell plate, and tightly attaching the outer shell plate;
automatically spraying solder on the lower surface of the flange at the top of the inner shell plate by using a dispenser, manually spraying the solder on the bottom of the inner shell plate, connecting the inner shell plate with the outer shell plate attached with the silk screen, and sintering the inner shell plate in a high-temperature furnace at 550 ℃;
the working medium deionized water is poured into the soaking plate by the injector, then the inside of the soaking plate is vacuumized by a vacuum machine, and the opening is nipped off immediately.
10. A power cell, comprising: the battery case according to any one of claims 1 to 8.
CN202210752909.7A 2022-06-29 2022-06-29 Battery shell, manufacturing method and power battery Pending CN115020862A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115549394A (en) * 2022-10-14 2022-12-30 广东畅能达科技发展有限公司 Heat dissipation device based on embedded soaking plate type U-shaped linear motor
CN115548523A (en) * 2022-09-30 2022-12-30 厦门海辰储能科技股份有限公司 Battery core, battery module, battery pack and energy storage equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115548523A (en) * 2022-09-30 2022-12-30 厦门海辰储能科技股份有限公司 Battery core, battery module, battery pack and energy storage equipment
CN115548523B (en) * 2022-09-30 2024-01-23 厦门海辰储能科技股份有限公司 Battery cell, battery module, battery pack and energy storage equipment
CN115549394A (en) * 2022-10-14 2022-12-30 广东畅能达科技发展有限公司 Heat dissipation device based on embedded soaking plate type U-shaped linear motor

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