WO2023092529A1 - Boîtier et procédé de fabrication et système associé, élément de batterie, batterie et dispositif électrique - Google Patents

Boîtier et procédé de fabrication et système associé, élément de batterie, batterie et dispositif électrique Download PDF

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Publication number
WO2023092529A1
WO2023092529A1 PCT/CN2021/133858 CN2021133858W WO2023092529A1 WO 2023092529 A1 WO2023092529 A1 WO 2023092529A1 CN 2021133858 W CN2021133858 W CN 2021133858W WO 2023092529 A1 WO2023092529 A1 WO 2023092529A1
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WO
WIPO (PCT)
Prior art keywords
wall
heat insulation
heat
battery
electrode assembly
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PCT/CN2021/133858
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English (en)
Chinese (zh)
Inventor
雷育永
郭志君
王鹏
金海族
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2021/133858 priority Critical patent/WO2023092529A1/fr
Priority to CN202180089512.8A priority patent/CN116686127A/zh
Publication of WO2023092529A1 publication Critical patent/WO2023092529A1/fr

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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
    • H01M10/04—Construction or manufacture in general
    • 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
    • H01M50/202—Casings or frames around the primary casing of a single cell or a single battery
    • 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

Definitions

  • the present application relates to the field of battery technology, in particular to a casing and its preparation method and system, a battery cell, a battery, and an electrical device.
  • Batteries are widely used in electronic equipment, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.
  • the application provides a casing, a preparation method and system, a battery cell, a battery, and an electrical device, aiming at improving the safety performance of the battery.
  • a casing is provided, and the casing is used to house an electrode assembly.
  • the casing includes a wall part, and a heat insulation structure is arranged inside the wall part, and in the thickness direction of the wall part, the heat insulation structure is used to prevent the heat of the electrode assembly from being conducted to the external space.
  • the heat insulation structure inside the wall can prevent the heat from being conducted along the thickness direction of the wall to a certain extent, thereby preventing the heat from being conducted to the outside.
  • the space can avoid heat diffusion to the structure of the external space and improve the safety performance of the battery.
  • the housing of the embodiments of the present application can confine heat inside the housing, reducing the impact on adjacent battery cells and other external components in the battery.
  • the heat insulation structure is arranged inside the wall, and when a plurality of battery cells are assembled into a battery, the heat insulation structure will not occupy additional battery space, thereby improving energy density and improving assembly efficiency.
  • the wall portion is a cylindrical structure
  • the heat insulation structure includes a heat insulation hole
  • the heat insulation hole extends along a first direction, and the first direction is an axial direction or a circumferential direction of the cylindrical structure.
  • the heat insulating hole extends in the axial direction, and the heat of the electrode assembly can be blocked by the heat insulating hole in the axial direction, preventing heat conduction and diffusion through the axially extending heat insulating hole.
  • the heat insulating holes extend along the circumferential direction, and the heat of the electrode assembly can be blocked by the heat insulating holes in the circumferential direction, preventing heat conduction and diffusion through the circumferentially extending heat insulating holes.
  • the wall portion is a flat plate structure
  • the heat insulation structure includes a heat insulation hole
  • the heat insulation hole extends along a first direction, and the first direction is perpendicular to the thickness direction of the wall portion.
  • the heat insulating hole extends along the first direction, and the heat of the electrode assembly can be blocked by the heat insulating hole in the first direction, preventing conduction and diffusion of heat through the heat insulating hole extending in the first direction.
  • the first direction is the length direction or the width direction of the wall portion.
  • the first direction is set as the length direction or the width direction of the wall portion, which is beneficial to the processing and shaping of the wall portion.
  • the heat insulation structure includes a plurality of heat insulation holes arranged at intervals, and the arrangement direction of the plurality of heat insulation holes intersects the first direction.
  • the heat insulation holes in the embodiments of the present application are independently arranged to block heat diffusion to a certain extent, and the independent arrangement can improve the strength of the casing.
  • the ratio of the size of the thermal insulation hole to the size of the wall portion is 1/3 ⁇ 1/2.
  • the heat insulation hole in the embodiment of the present application meets the requirements of the above size range, and can improve the strength of the wall while ensuring heat insulation.
  • the insulation hole penetrates the wall along the first direction.
  • the heat insulation hole in the embodiment of the present application is a continuous structure, and its heat insulation area is relatively large, which can improve the heat insulation effect.
  • the thermal insulation hole includes a plurality of hole segments, and the plurality of hole segments are arranged at intervals along the first direction.
  • the strength of the wall portion in the first direction can be improved by providing the heat insulation holes as a plurality of hole segments arranged at intervals.
  • the section perpendicular to the first direction of the thermal insulation hole is at least partially arc-shaped or polygonal.
  • the cross section of the embodiment of the present application can be flexibly adjusted according to the process requirements.
  • the thermal insulation structure further includes a thermal insulation material filled in the thermal insulation hole, and the thermal conductivity of the thermal insulation material is smaller than that of the wall.
  • the heat transfer rate can be slowed down to a certain extent because the heat insulation material in the heat insulation structure has a small thermal conductivity.
  • the housing includes a housing and an end cover
  • the housing includes a bottom wall and at least one side wall, at least one side wall surrounds the bottom wall, one end of the at least one side wall is connected to the bottom wall, and at least one The other end of the side wall surrounds an opening opposite to the bottom wall, the end cover covers the opening, and the wall is a side wall.
  • the heat conduction channel can be effectively formed to guide the heat to conduct from a specific direction, that is, the heat is directional guided inside the battery cell.
  • the present application provides a battery cell, which includes an electrode assembly and a shell according to any embodiment of the first aspect of the present application, and the shell is used to accommodate the electrode assembly.
  • the present application provides a battery, which includes a case and a plurality of battery cells according to the embodiment of the second aspect of the present application.
  • the multiple battery cells are arranged side by side along the second direction, and the box is used to accommodate the multiple battery cells.
  • the casing of each battery cell includes two opposite first walls and two opposite second walls along the second direction, the first wall connects the two second walls; the adjacent two The second walls of the battery cells are arranged opposite to each other along the second direction, and the wall part of the shell is the second wall.
  • the present application provides an electric device, which includes the battery according to any embodiment of the third aspect of the present application. Batteries are used to provide electrical energy.
  • the present application provides a method for manufacturing a housing, which includes: providing a wall; providing a heat insulation structure inside the wall, and in the thickness direction of the wall, the heat insulation structure is used to prevent the heat of the electrode assembly from being conducted to outside space.
  • the present application provides a manufacturing system for an outer shell, which includes: a providing device for providing a wall; a forming device for providing a heat insulation structure inside the wall, and insulating the heat in the thickness direction of the wall The structure is used to block the heat conduction of the electrode assembly to the external space.
  • Fig. 1 is a schematic structural view of a vehicle according to an embodiment of the present application
  • FIG. 2 is a schematic diagram of an exploded structure of a battery pack according to an embodiment of the present application.
  • Fig. 3 is a partial structural schematic diagram of a battery module in some embodiments of the present application.
  • Fig. 4 is a partial structural schematic diagram of battery modules in other embodiments of the present application.
  • Fig. 5 is a schematic diagram of an exploded structure of the battery cell shown in Fig. 3;
  • Fig. 6 is a schematic structural view of the battery cell shown in Fig. 4;
  • Fig. 7 is a schematic structural view of the casing of the battery cell in some embodiments of the present application.
  • Fig. 8 is a schematic structural view of the casing of the battery cell in other embodiments of the present application.
  • Fig. 9 is a schematic cross-sectional view of the housing shown in Fig. 8 along line A-A;
  • Fig. 10 is another schematic cross-sectional view of the housing shown in Fig. 8 along line A-A;
  • Fig. 11 is another schematic cross-sectional view of the shell shown in Fig. 8 along line A-A;
  • Fig. 12 is another schematic cross-sectional view of the shell shown in Fig. 8 along line A-A;
  • Fig. 13 is another schematic cross-sectional view of the housing shown in Fig. 8 along line A-A;
  • Fig. 14 is a schematic flow chart of the manufacturing method of the shell of some embodiments of the present application.
  • Fig. 15 is a schematic structural diagram of the manufacturing equipment of the casing according to some embodiments of the present application.
  • “Plurality” in this application refers to two or more (including two).
  • the battery cell may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a lithium sodium ion battery cell, a sodium ion battery cell or a magnesium ion battery cell, etc.
  • the embodiment of the present application does not limit this.
  • the battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application.
  • Battery cells are generally divided into three types according to packaging methods: cylindrical battery cells, square square battery cells and pouch battery cells, which are not limited in this embodiment of the present application.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack, and the like.
  • Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive pole piece, a negative pole piece and a separator.
  • a battery cell works primarily by moving metal ions between the positive and negative pole pieces.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode current collector and a positive electrode lug protruding from the positive electrode current collector. part is coated with a positive electrode active material layer, and at least part of the positive electrode tab is not coated with a positive electrode active material layer.
  • the material of the positive electrode current collector can be aluminum, the positive electrode active material layer includes the positive electrode active material, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collector and a negative electrode tab protruding from the negative electrode current collector, and the negative electrode current collector part is coated with a negative electrode active material layer, and at least part of the negative electrode tab is not coated with a negative electrode active material layer.
  • the material of the negative electrode current collector may be copper, the negative electrode active material layer includes the negative electrode active material, and the negative electrode active material may be carbon or silicon.
  • the number of positive pole tabs is multiple and stacked together, and the number of negative pole tabs is multiple and stacked together.
  • the material of the spacer can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).
  • the electrode assembly may be a wound structure or a laminated structure, which is not limited in the embodiment of the present application.
  • the battery cell may also include a casing, and the casing has an accommodating cavity inside, and the accommodating cavity is a closed space provided by the casing for the electrode assembly and the electrolyte.
  • the casing includes a casing and an end cap assembly, the casing is a hollow structure with one side open, the end cap assembly covers the opening of the casing and forms a sealed connection to form an accommodating cavity for accommodating the electrode assembly and the electrolyte.
  • the electrode assembly inside the battery cell will generate heat, which will cause the battery cell to thermal runaway .
  • the internal temperature of the battery cell rises, which may spread heat to adjacent battery cells, thereby causing thermal runaway of multiple battery cells in the battery, resulting in hierarchical thermal runaway.
  • the inventors tried to install a heat insulating material between two adjacent battery cells to prevent the transfer of heat.
  • the heat in the battery cell will still be conducted to the outside of the battery cell, which may still lead to thermal runaway of the layers, thereby causing a safety risk of the battery; and the heat insulation material will occupy the assembly space of the battery, and the battery The assembly efficiency is low.
  • the inventor improved the structure of the shell of the battery cell and provided a technical solution, in which the shell is used to accommodate the electrode assembly.
  • the casing includes a wall part, and a heat insulation structure is arranged inside the wall part, and in the thickness direction of the wall part, the heat insulation structure is used to prevent the heat of the electrode assembly from being conducted to the external space.
  • the shell with this structure can block the heat conduction of the electrode assembly to the outside to a certain extent, avoiding the thermal runaway of the layers, and improving the safety performance of the battery.
  • the technical solution described in the embodiments of the present application is applicable to a battery cell, a battery including the battery cell, and an electric device using the battery.
  • Electric devices can be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and electric tools, and so on.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles;
  • spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.;
  • electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.;
  • electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more.
  • the embodiments of the present application do not impose special limitations on the above-mentioned electrical devices.
  • the electric device is taken as an example for description.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • a battery 2 is arranged inside the vehicle 1 , and the battery 2 can be arranged at the bottom, head or tail of the vehicle 1 .
  • the battery 2 can be used for power supply of the vehicle 1 , for example, the battery 2 can be used as an operating power source of the vehicle 1 .
  • the vehicle 1 may also include a controller 3 and a motor 4 , the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, for the starting, navigation and working power requirements of the vehicle 1 during driving.
  • the battery 2 can not only be used as an operating power source for the vehicle 1 , but can also be used as a driving power source for the vehicle 1 to provide driving power for the vehicle 1 instead of or partially replacing fuel oil or natural gas.
  • Fig. 2 is a schematic diagram of an exploded structure of a battery pack provided by some embodiments of the present application.
  • the battery 2 includes a box body 5 and a battery cell (not shown in FIG. 2 ), and the battery cell is accommodated in the box body 5 .
  • the box body 5 is used to accommodate the battery cells, and the box body 5 may have various structures.
  • the box body 5 may include a first box body part 51 and a second box body part 52, the first box body part 51 and the second box body part 52 cover each other, the first box body part 51 and the second box body part 51
  • the two box parts 52 jointly define an accommodating space 53 for accommodating the battery cells.
  • the second box part 52 can be a hollow structure with one end open, the first box part 51 is a plate-shaped structure, and the first box part 51 covers the opening side of the second box part 52 to form an accommodating space 53
  • the box body 5; the first box body portion 51 and the second box body portion 52 also can be a hollow structure with one side opening, and the opening side of the first box body portion 51 is covered on the opening side of the second box body portion 52 , to form a box body 5 with an accommodation space 53 .
  • the first box body part 51 and the second box body part 52 can be in various shapes, such as a cylinder, a cuboid, and the like.
  • a sealing member may also be provided between the first box body portion 51 and the second box body portion 52, such as sealant, sealing ring, etc. .
  • the first box part 51 covers the top of the second box part 52
  • the first box part 51 can also be called an upper box cover
  • the second box part 52 can also be called a lower box.
  • the battery 2 there may be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel or in parallel.
  • the hybrid connection means that there are both series and parallel connections among the multiple battery cells.
  • a plurality of battery cells can be directly connected in series or in parallel or mixed together, and then the whole composed of a plurality of battery cells is accommodated in the box 5; of course, it is also possible to first connect a plurality of battery cells in series or parallel or
  • the battery modules 6 are formed by parallel connection, and multiple battery modules 6 are connected in series or in parallel or in series to form a whole, and are housed in the box body 5 .
  • Fig. 3 is a schematic diagram of a partial structure of a battery module according to some embodiments of the present application.
  • Fig. 4 is a schematic diagram of a partial structure of a battery module according to other embodiments of the present application.
  • there are multiple battery cells 7 and the multiple battery cells 7 are connected in series, in parallel, or in parallel to form a battery module 6 .
  • a plurality of battery modules 6 are connected in series, in parallel or in parallel to form a whole, and accommodated in the box.
  • a plurality of battery cells are arranged side by side along the second direction E.
  • the plurality of battery cells 7 in the battery module 6 can be electrically connected through a confluence component, so as to realize parallel connection, series connection or mixed connection of the plurality of battery cells 7 in the battery module 6.
  • FIG. 5 is a schematic diagram of an exploded structure of the battery cell shown in FIG. 3 ;
  • FIG. 6 is a schematic structural diagram of the battery cell shown in FIG. 4 .
  • the battery cell 7 provided by the embodiment of the present application includes an electrode assembly 8 and a casing 9 , and the electrode assembly 8 is accommodated in the casing 9 .
  • the battery cell 7 there may be one or more electrode assemblies 8 accommodated in the case 9 .
  • the case 9 there may be one or more electrode assemblies 8 accommodated in the case 9 .
  • FIG. 5 there are four electrode assemblies 8 .
  • the electrode assembly 8 includes a positive pole piece, a negative pole piece and a separator.
  • the electrode assembly 8 may be a wound electrode assembly, a laminated electrode assembly or other forms of electrode assemblies.
  • the electrode assembly 8 is a wound electrode assembly.
  • the positive pole piece, the negative pole piece and the separator are all strip-shaped structures.
  • the positive electrode sheet, the separator, and the negative electrode sheet can be stacked in sequence and wound more than two times to form an electrode assembly.
  • the electrode assembly is a laminated electrode assembly.
  • the electrode assembly 8 includes a plurality of positive electrode sheets and a plurality of negative electrode sheets, the positive electrode sheets and the negative electrode sheets are alternately stacked, and the stacking direction is parallel to the thickness direction of the positive electrode sheet and the thickness direction of the negative electrode sheet.
  • the electrode assembly 8 includes a main body 81 and a tab 82 connected to the main body 81 .
  • the tab portion 82 extends from one end of the main body portion 81 .
  • the two tabs 82 are respectively defined as a positive tab and a negative tab.
  • the positive pole tab and the negative pole tab may extend from the same end of the main body 81 , or may extend from opposite ends of the main body 81 respectively.
  • the main body 81 is the core part of the electrode assembly 8 to realize the charging and discharging function, and the tab part 82 is used to lead out the current generated by the main body 81 .
  • the main body portion 81 includes a positive current collector of a positive current collector, a positive active material layer, a negative current collector of a negative current collector, a negative active material layer, and a separator.
  • the positive pole tab part includes a plurality of positive pole tabs
  • the negative pole tab part includes a plurality of negative pole tabs.
  • the tab portion 82 is used to be electrically connected to the electrode terminal 921 .
  • the tab portion 82 may be directly connected to the electrode terminal 921 by means of welding or the like, or may be indirectly connected to the electrode terminal 921 through other components.
  • the battery cell 7 further includes a current collecting member for electrically connecting the electrode terminal 921 and the tab portion 82 .
  • There are two current collecting members the two current collecting members are respectively defined as a positive current collecting member and a negative current collecting member, the positive current collecting member is used to electrically connect the positive electrode terminal and the positive electrode ear, and the negative current collecting member is used for electrical connection Negative pole terminal and negative pole lug.
  • housing 9 may also be used to contain electrolyte, such as electrolytic solution.
  • the shell 9 can be in various structural forms.
  • the housing 9 may include a housing 91 and an end cover assembly 92, the housing 91 is a hollow structure with one side open, and the end cover assembly 92 covers the opening of the housing 91 and forms a sealed connection to form An accommodating cavity for accommodating the electrode assembly 8 and electrolyte.
  • the housing 91 can be in various shapes, such as cylinder, cuboid and so on.
  • the shape of the casing 91 can be determined according to the specific shape of the electrode assembly 8 .
  • the electrode assembly 8 has a cuboid structure, and a cuboid casing can be selected.
  • the electrode assembly 8 is a cylindrical structure, and it can be selected as a cylindrical shell.
  • the end cover assembly 92 includes an end cover 922 , and the end cover 922 covers the opening of the housing 91 .
  • the end cap 922 can be of various structures, for example, the end cap 922 is a plate-shaped structure, a hollow structure with one end open, and the like.
  • the housing 91 is a cuboid structure
  • the end cover 922 is a plate-shaped structure
  • the end cover 922 covers the opening at the top of the housing 91 .
  • the end cap 922 can be made of insulating material (such as plastic) or conductive material (such as metal). When the end cap 922 is made of a metal material, the end cap 922 may also include an insulator (not shown in the figure), and the insulator is located on the side of the end cap 922 facing the electrode assembly 8 to connect the end cap 922 and the electrode assembly 8 Insulated.
  • the end cover assembly 92 may further include an electrode terminal 921 mounted on the end cover 922 .
  • the housing 9 can also be of other structures.
  • the housing 9 includes a housing 91 and two end covers 922.
  • the housing 91 is a hollow structure with openings on opposite sides, and one end cover 922 is correspondingly closed. An opening of the casing 91 is sealed and connected to form an accommodating chamber for accommodating the electrode assembly 8 and the electrolyte.
  • two electrode terminals 921 may be provided on one end cover 922 while no electrode terminal 921 is provided on the other end cover 922 , or one electrode terminal 921 may be provided on each of the two end covers 922 .
  • Fig. 7 is a schematic structural view of the casing of the battery cell in some embodiments of the present application.
  • the housing 9 includes a wall, and a heat insulating structure 10 is provided inside the wall. In the thickness direction of the wall, the heat insulating structure 10 is used to block the electrode assembly 8 The heat is conducted to the outside space.
  • the blocking can be to completely block the conduction of heat through the thermal insulation structure 10, in other words, the thermal insulation structure 10 is a thermal insulation material. Blocking may also mean that the thermal insulation structure 10 can slow down the conduction of heat to a certain extent. In other words, the thermal conductivity of the thermal insulation structure 10 is relatively small, and heat is not easily conducted through the thermal insulation structure 10 .
  • the heat insulation structure 10 includes a heat insulation hole 11, and the interior of the heat insulation hole 11 may be air, and the thermal conductivity of the air is relatively small, and the conduction rate is low. Or the heat insulation structure 10 is filled with a heat insulation material or a heat insulation material with a relatively small thermal conductivity.
  • the wall can be made of various materials, such as metal materials or organic polymer materials.
  • the metal material is copper, iron, aluminum, stainless steel, or aluminum alloy.
  • the organic polymer materials are polyethylene PE, polyethylene derivatives, polypropylene PP, polypropylene derivatives, polyethylene terephthalate PET, polybutylene terephthalate PBT, etc. This embodiment of the present application does not make a special limitation on this.
  • the wall is made of metal, the metal is a good thermal conductor with a high thermal conductivity, and the heat of the electrode assembly 8 will be rapidly conducted and diffused through the wall.
  • the heat insulation structure 10 provided in the wall can largely block the conduction of heat through the wall.
  • the inside of the wall is provided with a heat insulation structure 10, which can prevent the heat from continuing to conduct along the thickness direction of the wall to a certain extent. , thereby avoiding heat conduction to the external space, avoiding heat diffusion to the structure of the external space, and improving the safety performance of the battery.
  • the casing 9 of the embodiment of the present application can confine heat inside the casing 9 and reduce the impact on adjacent battery cells and other external components in the battery.
  • the heat insulation structure 10 is disposed inside the wall. When a plurality of battery cells are assembled into a battery, the heat insulation structure 10 will not occupy additional battery space, thereby increasing the energy density of the battery and improving assembly efficiency.
  • the housing 9 of the embodiment of the present application includes a housing 91 and an end cover 922 , the housing 91 includes a bottom wall 912 and at least one side wall 911 , at least one side wall 911 is surrounded by the bottom wall 912 Around, one end of at least one side wall 911 is connected to the bottom wall 912, the other end of at least one side wall 911 encloses an opening opposite to the bottom wall 912, and the end cover 922 covers the opening.
  • the wall part is at least a part of the side wall 911 , at least a part means part or all of the side wall 911 , and the heat of the electrode assembly 8 is blocked by part or all of the side wall 911 .
  • the heat of the electrode assembly 8 is blocked by a part of the side wall 911 , the heat can be diffused and conducted through another part of the side wall 911 .
  • the heat can be diffused and conducted from the bottom wall 912 or the end cover 922 .
  • a heat conduction channel can be effectively formed to guide heat conduction from a specific direction, that is, directional guide heat within the battery cell.
  • the wall part can also be the end cover 922 or the bottom wall 912 .
  • the end cover 922 or the bottom wall 912 can block heat conduction and guide heat to diffuse and conduct from the side wall 911 .
  • the shape of the sidewall 911 may be determined according to the shape of the electrode assembly 8 .
  • the electrode assembly 8 may have a cylindrical structure or a rectangular parallelepiped structure.
  • the shape of the side wall 911 is a cylindrical structure or a rectangular parallelepiped structure.
  • the electrode assembly is a cylindrical structure.
  • the casing 91 includes a side wall 911 which is a cylindrical structure and is disposed around the bottom wall 912 .
  • the wall is the side wall 911 , and the heat insulation structure 10 inside the wall is arranged around the bottom wall 912 , which can prevent heat from diffusing and conducting through the side wall 911 to a certain extent, and guide heat to conduct from the bottom wall 912 or the end cover 922 .
  • the heat insulation structure 10 includes a heat insulation hole 11 extending along a first direction, the first direction being the axial direction X or the circumferential direction Y of the cylindrical structure.
  • the thermal insulation hole 11 extends along the axial direction X, and the heat of the electrode assembly 8 can be blocked by the thermal insulation hole 11 in the axial direction X, preventing heat conduction and diffusion through the thermal insulation hole 11 extending in the axial direction X.
  • the heat insulating hole 11 extends along the circumferential direction Y, and the heat of the electrode assembly 8 can be blocked by the heat insulating hole 11 in the circumferential direction Y, preventing heat conduction and diffusion through the heat insulating hole 11 extending in the circumferential direction Y.
  • the X direction shown in FIG. 7 represents the axial direction of the cylindrical structure, and the Y direction represents the circumferential direction of the cylindrical structure.
  • the thermal insulation structure 10 includes a plurality of thermal insulation holes 11 arranged at intervals, and the arrangement direction of the plurality of thermal insulation holes 11 intersects the first direction.
  • the first direction is the axial direction X
  • the plurality of heat insulating holes 11 extend along the axial direction X, that is, the arrangement direction of the plurality of heat insulating holes 11 is the circumferential direction Y.
  • the first direction is the circumferential direction Y
  • the plurality of heat insulating holes 11 extend along the circumferential direction Y, that is, the arrangement direction of the plurality of heat insulating holes 11 is the axial direction X.
  • the heat insulation holes 11 are independently arranged, which can block the diffusion of heat to a certain extent, and the independent arrangement can improve the strength of the casing 9 .
  • the heat insulating hole 11 may also include a first heat insulating hole and a second heat insulating hole, the first heat insulating hole extends along the axial direction X, and the second heat insulating hole extends along the circumferential direction Y , the first heat insulation holes and the second heat insulation holes are arranged alternately, which can further improve the heat insulation effect of the heat insulation holes 11 .
  • Fig. 8 is a schematic structural view of the housing of the battery cells in other embodiments of the present application.
  • the electrode assembly has a rectangular parallelepiped structure.
  • the casing 91 includes four side walls 911 , and the four side walls 911 form a rectangular parallelepiped structure.
  • the four side walls 911 include two opposite first walls 9111 and two opposite second walls 9112 along the second direction E, the first walls 9111 connect the two second walls 9112, wherein the second walls 9112 The area is larger than the area of the first wall 9111.
  • the second walls 9112 of two adjacent battery cells may be oppositely arranged along the second direction E.
  • the heat insulation structure 10 includes a heat insulation hole 11 extending along a first direction, and the first direction is perpendicular to the thickness direction of the wall portion.
  • the first direction may be the longitudinal direction Z of the wall portion, or a direction forming a certain angle with the longitudinal direction Z, such as a width direction F forming 90° with the longitudinal direction, or an inclined direction forming 45° with the longitudinal direction Z, etc.
  • the thermal insulation hole 11 extends along the first direction, and the heat of the electrode assembly 8 can be blocked by the thermal insulation hole 11 in the first direction, preventing heat conduction and diffusion through the thermal insulation hole 11 extending in the first direction.
  • the first direction is the length direction Z or the width direction F of the wall portion, which is convenient for processing and forming; for example, the wall portion can be processed and formed by an extrusion molding process.
  • the Z direction shown in FIG. 8 represents the longitudinal direction of the wall portion of the flat plate structure
  • the F direction represents the width direction of the wall portion of the flat plate structure
  • the thermal insulation structure 10 includes a plurality of thermal insulation holes 11 arranged at intervals, and the arrangement direction of the plurality of thermal insulation holes 11 intersects the first direction.
  • the first direction is the length direction Z
  • the plurality of heat insulating holes 11 extend along the length direction Z
  • the arrangement direction of the plurality of heat insulating holes 11 may be the width direction F.
  • the first direction is the width direction F
  • the plurality of heat insulation holes 11 extend along the width direction F
  • the arrangement direction of the plurality of heat insulation holes 11 may be the length direction Z.
  • the independent arrangement between each heat insulating hole 11 can block the diffusion of heat to a certain extent, and the independent arrangement can improve the strength of the casing 9.
  • the wall portion is at least one side wall 911, and the wall portion is a flat plate structure.
  • Fig. 9 is a schematic cross-sectional view of the housing shown in Fig. 8 taken along line A-A.
  • the wall part is two second walls 9112, the area of the second wall 9112 is larger than the area of the first wall 9111, and the heat conduction area is larger, by setting the heat insulation structure 10 on The second wall 9112 can increase the area of blocking heat conduction and improve the blocking effect; the heat is blocked by the second wall 9112, and the heat is conducted and dissipated through the first wall 9111.
  • FIG. 10 is another schematic cross-sectional view of the housing shown in FIG. 8 taken along line A-A.
  • the wall portions are two first walls 9111 , and the heat conduction process thereof is similar to that of the two second walls 9112 , which will not be repeated here.
  • FIG. 11 is another schematic cross-sectional view of the housing shown in FIG. 8 taken along line A-A.
  • the wall parts are two second walls 9112 and one first wall 9111 , and this arrangement can guide heat to diffuse and conduct from the other first wall 9111 .
  • Fig. 12 is another schematic cross-sectional view of the housing shown in Fig. 8 taken along line A-A.
  • the wall parts are two second walls 9112 and two first walls 9111 , and this arrangement can guide heat to diffuse and conduct from the bottom wall or the end cover.
  • Fig. 13 is another schematic cross-sectional view of the housing shown in Fig. 8 taken along line A-A.
  • the wall part is two second walls 9112, and the interior of the wall part includes the heat insulation structure 10, in other words, the two second walls 9112 respectively include the heat insulation structure 10, and the two second walls
  • the heat insulation structures 10 of the walls 9112 respectively include a plurality of heat insulation holes 11 arranged at intervals, and the projections of the heat insulation structures 10 of the two second walls 9112 in the thickness direction are at least partially non-overlapping.
  • the heat insulation structures 10 of the two second walls 9112 are arranged asymmetrically, and when a plurality of battery cells are assembled into a battery, the heat insulation area of the second walls 9112 of adjacent battery cells can be increased to further improve the heat insulation effect.
  • the heat insulating hole 11 may also include a third heat insulating hole and a fourth heat insulating hole, the third heat insulating hole extends along the length direction, the fourth heat insulating hole extends along the width direction, and the third heat insulating hole extends along the width direction.
  • the heat holes and the fourth heat insulation holes are arranged alternately, which can further improve the heat insulation effect of the heat insulation holes 11 .
  • the heat insulation structure 10 can be the heat insulation structure 10 provided in the cylindrical wall part, or the heat insulation structure 10 provided in the wall part of the plate structure. 10.
  • the ratio of the size of the thermal insulation hole 11 to the size of the wall portion is 1/3 ⁇ 1/2.
  • the heat insulation holes 11 can improve the strength of the wall while ensuring heat insulation.
  • the heat insulation hole 11 runs through the wall along the first direction, and the heat insulation hole 11 is a continuous structure with a relatively large heat insulation area, which can improve the heat insulation effect.
  • the heat insulating hole 11 includes a plurality of hole segments, and the plurality of hole segments are arranged at intervals along the first direction.
  • the strength of the wall portion in the first direction can be improved by providing the heat insulating hole 11 as a plurality of hole segments arranged at intervals.
  • the section perpendicular to the first direction of the heat insulating hole 11 is at least partially arc-shaped or polygonal.
  • at least part of the arc-shaped section may be a circular section, an elliptical section, a U-shaped section, a C-shaped section, and the like.
  • the polygonal cross-section may be a triangular cross-section, a rectangular cross-section, a trapezoidal cross-section, a hexagonal cross-section, and the like.
  • the specific setting form of the section can be flexibly adjusted according to the process requirements, and is not limited here.
  • the thermal insulation structure 10 further includes a thermal insulation material filled in the thermal insulation hole 11 , and the thermal conductivity of the thermal insulation material is smaller than that of the wall.
  • Fig. 14 is a schematic flow chart of the manufacturing method of the casing according to some embodiments of the present application.
  • the embodiment of the present application also provides a method for manufacturing a casing, which includes:
  • a heat insulation structure is provided inside the wall, and in the thickness direction of the wall, the heat insulation structure is used to prevent the heat of the electrode assembly from being conducted to the external space.
  • the inside of the wall is provided with a heat insulation structure, and the heat insulation structure can block the heat from passing along the wall to a certain extent.
  • the conduction continues in the thickness direction, thereby avoiding heat conduction to the external space, avoiding heat diffusion to the structure of the external space, and improving the safety performance of the battery.
  • the manufacturing method of the casing of the embodiment of the present application can manufacture the casing of the above-mentioned embodiments.
  • Fig. 15 is a schematic structural diagram of the manufacturing equipment of the casing according to some embodiments of the present application.
  • the embodiment of the present application also provides a manufacturing device for a casing, the manufacturing device 1000 includes:
  • the molding device 200 is used to provide a heat insulation structure inside the wall, and in the thickness direction of the wall, the heat insulation structure is used to prevent the heat of the electrode assembly from being conducted to the external space.
  • the inside of the wall is provided with a heat insulation structure, which can block the heat along the wall to a certain extent.
  • the thickness direction continues to conduct, thereby avoiding heat conduction to the external space, avoiding heat diffusion to the structure of the external space, and improving the safety performance of the battery.
  • the housing manufacturing device 1000 of the embodiment of the present application may execute the manufacturing method of the housing of the foregoing embodiments.

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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)
  • Battery Mounting, Suspending (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

Des modes de réalisation de la présente invention concernent un boîtier et un procédé de fabrication et un système associé, un élément de batterie, une batterie et un dispositif électrique. Le boîtier est utilisé pour recevoir l'ensemble électrode. Le boîtier comprend une partie paroi, une structure d'isolation thermique est disposée dans la partie paroi, et dans le sens de l'épaisseur de la partie paroi, la structure d'isolation thermique est utilisée pour bloquer la conduction de la chaleur de l'ensemble électrode à l'espace externe. Dans les modes de réalisation de la présente demande, lorsque la chaleur générée par l'ensemble électrode est conduite vers la partie paroi, la structure d'isolation thermique agencée dans la partie paroi peut bloquer la conduction continue de la chaleur dans le sens de l'épaisseur de la partie de paroi jusqu'à une certaine mesure, ce qui permet d'éviter une conduction thermique vers l'espace externe, d'éviter la diffusion de chaleur sur la structure de l'espace externe, et d'améliorer les performances de sécurité de la batterie.
PCT/CN2021/133858 2021-11-29 2021-11-29 Boîtier et procédé de fabrication et système associé, élément de batterie, batterie et dispositif électrique WO2023092529A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2021/133858 WO2023092529A1 (fr) 2021-11-29 2021-11-29 Boîtier et procédé de fabrication et système associé, élément de batterie, batterie et dispositif électrique
CN202180089512.8A CN116686127A (zh) 2021-11-29 2021-11-29 外壳及其制备方法和系统、电池单体、电池、用电装置

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/133858 WO2023092529A1 (fr) 2021-11-29 2021-11-29 Boîtier et procédé de fabrication et système associé, élément de batterie, batterie et dispositif électrique

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013246877A (ja) * 2012-05-23 2013-12-09 Toyota Industries Corp 蓄電装置
CN204333071U (zh) * 2014-12-23 2015-05-13 比亚迪股份有限公司 用于电池的外壳组件及具有它的电池
CN106654085A (zh) * 2016-08-31 2017-05-10 广东新凌嘉新能源股份有限公司 防爆隔热阻燃电池、电池组及其使用方法
CN212874604U (zh) * 2020-08-28 2021-04-02 湖北亿纬动力有限公司 一种隔热端板、电芯模组及电池包

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013246877A (ja) * 2012-05-23 2013-12-09 Toyota Industries Corp 蓄電装置
CN204333071U (zh) * 2014-12-23 2015-05-13 比亚迪股份有限公司 用于电池的外壳组件及具有它的电池
CN106654085A (zh) * 2016-08-31 2017-05-10 广东新凌嘉新能源股份有限公司 防爆隔热阻燃电池、电池组及其使用方法
CN212874604U (zh) * 2020-08-28 2021-04-02 湖北亿纬动力有限公司 一种隔热端板、电芯模组及电池包

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