WO2024021249A1 - Boîtier de batterie, élément de batterie, batterie et dispositif électrique - Google Patents

Boîtier de batterie, élément de batterie, batterie et dispositif électrique Download PDF

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Publication number
WO2024021249A1
WO2024021249A1 PCT/CN2022/118743 CN2022118743W WO2024021249A1 WO 2024021249 A1 WO2024021249 A1 WO 2024021249A1 CN 2022118743 W CN2022118743 W CN 2022118743W WO 2024021249 A1 WO2024021249 A1 WO 2024021249A1
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WIPO (PCT)
Prior art keywords
side wall
battery case
battery
reinforcement
along
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PCT/CN2022/118743
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English (en)
Chinese (zh)
Inventor
陈悦飞
毛国安
蒋嘉丽
曹俊琪
Original Assignee
宁德时代新能源科技股份有限公司
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Publication of WO2024021249A1 publication Critical patent/WO2024021249A1/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
    • 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
    • H01M50/14—Primary casings; Jackets or wrappings for protecting against damage caused by external factors
    • 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
    • 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
    • H01M50/236—Hardness
    • 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
    • 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
    • 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

  • This application relates to the field of battery technology, in particular to battery cases, battery cells, batteries and electrical devices.
  • the battery case is usually designed as a thin case to obtain greater accommodation space inside.
  • this design will also reduce the structural strength, making it difficult to control the flatness of the battery case and posing great challenges to welding operations.
  • the present application provides a battery case for a battery cell, including: a case body with a cavity with an opening at an end; the cavity is used to accommodate an electrode assembly; the case body includes rows of rows around the edge of the opening The first side wall and the second side wall of the cloth; the reinforcement member, the first side wall is provided with a reinforcement member extending along the first direction, and the second side wall is provided with a reinforcement member extending along the second direction; wherein, the first direction Intersects with the second direction.
  • reinforcement members are respectively provided on at least two side walls surrounding the edge of the opening, that is, the first side wall and the second side wall, so that the structure of at least two side walls of the battery case is strengthened. Since the reinforcing members in the first side wall extend along the first direction, and the reinforcing members in the second side wall extend along the second direction, and the first direction intersects with the second direction, these two types of reinforcing members can affect the battery case. The deformation in both directions is inhibited, which greatly improves the structural strength of the battery case, avoids serious structural deformation before welding, and ensures the smooth progress of the welding operation.
  • the first side wall is adjacent to the second side wall, and the first side wall is a side wall of the shell body that is perpendicular to a preset direction; wherein the preset direction is consistent with the thickness direction of the electrode assembly.
  • the positional relationship between the first side wall and the second side wall is reasonably arranged, so that the side of the case body with larger deformation can be effectively reinforced, and the overall structural stiffness of the battery case can be improved, so that the flatness of the battery case can be effectively controlled.
  • the second direction is defined as perpendicular to the plane on which the opening is located
  • the first direction is defined as perpendicular to the plane formed between the second direction and the preset direction.
  • the distance between two adjacent reinforcement members is denoted as D1
  • the width of the first side wall along the second direction is denoted as K1, where 0.03*K1 ⁇ D1 ⁇ 0.7 *K1.
  • the ratio between the distance D1 and the width K1 is reasonably controlled to ensure an appropriate number of reinforcements on the first side wall, so that the first side wall can take into account both the overall structural strength and the overall weight.
  • the distance D1 satisfies the condition: 0.1 millimeter (mm) ⁇ D1 ⁇ 200 mm. In this way, the distance between two adjacent reinforcement members is reasonably controlled, and the structural strength of the first side wall of the battery case is improved and the amount of structural deformation is reduced while ensuring reasonable manufacturing costs.
  • the reinforcements located on either side of the outermost two sides in the second direction are the same as the corresponding side of the first side wall in the second direction.
  • the distance between them is recorded as J1, where 0.1mm ⁇ J1 ⁇ 200mm. In this way, a spacing is reserved at the top and bottom of the first side wall to avoid the reinforcement being disposed on the edge of the first side wall, which would increase the difficulty of manufacturing the reinforcement.
  • the distance between any end of the reinforcement member along the first direction and the corresponding side edge of the first side wall along the first direction is denoted as J2, where 0.1 mm ⁇ J2 ⁇ 200 mm.
  • the width of the reinforcement along the second direction is denoted as W1, where 0.01mm ⁇ W1 ⁇ 50mm.
  • W1 the width size of the reinforcement is reasonably designed to facilitate the installation of the required number of reinforcements in the second direction and ensure that the first side wall has sufficient structural stiffness.
  • the height of the reinforcement member protruding from the first side wall is denoted as H1, where 0.01mm ⁇ H1 ⁇ 5mm.
  • H1 the height dimension of the reinforcement should be designed reasonably to avoid protruding too high and occupying the space inside the battery, thus avoiding affecting the energy density of the battery.
  • the distance between two adjacent reinforcement members is denoted as D2
  • the width of the second side wall along the preset direction is denoted as K2, where 0.03*K2 ⁇ D2 ⁇ 0.7 *K2.
  • the ratio between the distance D2 and the width K2 is reasonably controlled to ensure an appropriate number of reinforcements on the second side wall, so that the second side wall can take into account the overall structural strength and overall weight.
  • the distance D2 satisfies the condition: 0.1mm ⁇ D2 ⁇ 200mm. In this way, the distance between two adjacent reinforcement members is reasonably controlled, and the structural strength of the second side wall of the battery case is improved and the amount of structural deformation is reduced while ensuring reasonable manufacturing costs.
  • the reinforcements located on either side of the outermost two sides in the preset direction are the same as the corresponding side of the second side wall in the preset direction.
  • the distance between them is recorded as J3, where 0.1mm ⁇ J3 ⁇ 200mm. In this way, a gap is reserved at both the left and right sides of the second side wall to avoid the reinforcement being disposed on the edge of the second side wall, which would increase the difficulty of manufacturing the reinforcement.
  • the distance between any end of the reinforcement member along the second direction and the corresponding side edge of the second side wall along the second direction is marked as J4, where 0.1mm ⁇ J4 ⁇ 200mm.
  • the width of the reinforcement along the preset direction is denoted as W2, where 0.01mm ⁇ W2 ⁇ 50mm.
  • W2 the width size of the reinforcement is reasonably designed to facilitate the installation of the required number of reinforcements in the preset direction to ensure that the second side wall has sufficient structural stiffness.
  • the height of the reinforcing member protruding from the second side wall is denoted as H2, where 0.01mm ⁇ H2 ⁇ 5mm.
  • H2 the height dimension of the reinforcement should be designed reasonably to avoid protruding too high and occupying the space inside the battery, thus avoiding affecting the energy density of the battery.
  • first side walls and at least two second side walls wherein the two second side walls are respectively spaced between the two first side walls, and at least one first side wall has a first edge along the first side wall.
  • a reinforcing member is provided extending along the second direction, and at least one second side wall is provided with a reinforcing member extending along the second direction. In this way, it is ensured that at least one first side wall and the second side wall are provided with reinforcement members extending in different directions, thereby improving the overall structural strength of the battery case.
  • all reinforcement members are provided on a side of the first side wall facing away from the chamber. In this way, the reinforcement is arranged on the side of the first side wall facing away from the chamber to avoid affecting the internal space of the battery case and ensure that the group margin inside the battery cell remains unchanged.
  • all reinforcement members are provided on the side of the second side wall facing away from the chamber. In this way, the reinforcement is arranged on the side of the second side wall facing away from the chamber to avoid affecting the internal space of the battery case and ensure that the group margin inside the battery cell remains unchanged.
  • At least a portion of the first side wall protrudes from one side of the first side wall along its thickness direction to form a reinforcement, and a first recess is left on the other side of the first side wall. In this way, it is helpful to simplify the molding process of the reinforcement and improve the processing efficiency of the battery case.
  • At least a portion of the second side wall protrudes from one side of the second side wall along its thickness direction to form a reinforcement, and a second recess is left on the other side of the second side wall. In this way, it is helpful to simplify the molding process of the reinforcement and improve the processing efficiency of the battery case.
  • the present application provides a battery cell, including: a battery case according to any of the above items; and an electrode assembly housed in a chamber.
  • this application provides a battery, including the above battery cell.
  • the present application provides an electrical device, including the above battery, and the battery is used to provide electrical energy.
  • Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • Figure 2 is an exploded view of a battery provided by some embodiments of the present application.
  • Figure 3 is a schematic diagram of the exploded structure of a battery cell provided by some embodiments of the present application.
  • Figure 4 is a schematic structural diagram of a battery case provided by some embodiments of the present application.
  • FIG. 5 is a schematic diagram 2 of the battery case structure provided by some embodiments of the present application.
  • Figure 6 is a schematic diagram 3 of the battery case structure provided by some embodiments of the present application.
  • Figure 7 is an enlarged schematic diagram of the structure at circle A in Figure 6;
  • Figure 8 is a schematic structural diagram 4 of a battery case provided by some embodiments of the present application.
  • Figure 9 is a schematic diagram of different distributions of first recesses or second recesses provided by some embodiments of the present application.
  • an embodiment means that a particular feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application.
  • the appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those skilled in the art understand, both explicitly and implicitly, that the embodiments described herein may be combined with other embodiments.
  • multiple refers to more than two (including two).
  • multiple groups refers to two or more groups (including two groups), and “multiple pieces” refers to It is more than two pieces (including two pieces).
  • Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding.
  • Power batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but are also widely used in electric vehicles such as electric bicycles, electric motorcycles and electric cars, as well as in many fields such as military equipment and aerospace. . As the application fields of power batteries continue to expand, their market demand is also constantly expanding.
  • the battery case in order to obtain high energy density, the battery case is usually designed as a thin case to obtain a larger accommodation space within the battery case.
  • the flatness of the battery shell is difficult to control, which poses great challenges to welding manufacturability. For example, shell cover assembly positioning, welding laser leakage and welding thermal deformation are difficult to solve.
  • reinforcement ribs are usually provided on the side walls of the battery case to strengthen the structural strength of the battery case and reduce its structural deformation.
  • the existing reinforcement ribs on the battery case are designed to extend in one direction. Such a design can only inhibit deformation in a specific direction, but cannot inhibit deformation in other directions, causing the battery case to be in a certain direction. The direction is also prone to deformation, which also brings great challenges to welding operations.
  • a reinforcing member is provided extending in one direction, and a reinforcing member is provided on the second side wall extending along a second direction; wherein the first direction intersects with the second direction.
  • Reinforcing members are respectively provided on at least two side walls surrounding the edge of the opening, that is, the first side wall and the second side wall, so that the structure of at least two side walls of the battery case is strengthened. Since the reinforcing members in the first side wall extend along the first direction, and the reinforcing members in the second side wall extend along the second direction, and the first direction intersects with the second direction, these two types of reinforcing members can affect the battery case. The deformation in both directions is inhibited, which greatly improves the structural strength of the battery case, avoids serious structural deformation before welding, and ensures the smooth progress of the welding operation.
  • the battery cells disclosed in the embodiments of the present application can be used in, but are not limited to, electrical devices such as vehicles, ships, or aircrafts.
  • a power supply system including the battery cells, batteries, etc. disclosed in this application can be used to form the electrical device.
  • Embodiments of the present application provide an electrical device that uses a battery as a power source.
  • the electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc.
  • electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc.
  • spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.
  • an electrical device is a vehicle.
  • FIG. 1 is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application.
  • the vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc.
  • the battery 100 is disposed inside the vehicle 1000 , and the battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000 .
  • the battery 100 may be used to power the vehicle 1000, for example, the battery 100 may serve as an operating power source for the vehicle 1000.
  • the vehicle 1000 may also include a controller 200 and a motor 300 .
  • the controller 200 is used to control the battery 100 to provide power to the motor 300 , for example, for starting, navigating and driving the vehicle 1000 .
  • the battery 100 can not only be used as an operating power source for the vehicle 1000 , but also can be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .
  • FIG. 2 is an exploded view of the battery 100 provided by some embodiments of the present application.
  • the battery 100 includes a case 20 and a battery cell 10 , and the battery cell 10 is accommodated in the case 20 .
  • the box 20 is used to provide an accommodation space for the battery cells 10 , and the box 20 can adopt a variety of structures.
  • the box 20 may include a first part 21 and a second part 22 , the first part 21 and the second part 22 covering each other, the first part 21 and the second part 22 jointly defining a space for accommodating the battery cell 10 of accommodation space.
  • the second part 22 may be a hollow structure with an opening 11b at one end, and the first part 21 may be a plate-like structure.
  • the first part 21 covers the opening 11b side of the second part 22, so that the first part 21 and the second part 22 jointly define a Accommodation space; the first part 21 and the second part 22 may also be hollow structures with an opening 11b on one side, and the opening 11b side of the first part 21 is covered with the opening 11b side of the second part 22.
  • the box 20 formed by the first part 21 and the second part 22 can be in various shapes, such as cylinder, rectangular parallelepiped, etc.
  • the battery 100 there may be a plurality of battery cells 10 , and the plurality of battery cells 10 may be connected in series, in parallel, or in mixed connection.
  • Mixed connection means that the plurality of battery cells 10 are connected in series and in parallel.
  • Multiple battery cells 10 can be directly connected in series or in parallel or mixed together, and then the whole composed of multiple battery cells 10 can be accommodated in the box 20 ; of course, the battery 100 can also be multiple battery cells 10
  • the battery 100 modules are connected in series, parallel, or mixed to form a module form, and then multiple battery 100 modules are connected in series, parallel, or mixed to form a whole, and are accommodated in the box 20 .
  • the battery 100 may also include other structures.
  • the battery 100 may further include a bus component for realizing electrical connections between multiple battery cells 10.
  • Each battery cell 10 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto.
  • the battery cell 10 may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes.
  • FIG. 3 is a schematic diagram of the exploded structure of the battery cell 10 provided in some embodiments of the present application.
  • the battery cell 10 refers to the smallest unit that constitutes the battery 100 .
  • the battery cell 10 includes an end cover 2, a battery case 1, an electrode assembly 4 and other functional components.
  • the end cover 2 refers to a component that covers the opening 11 b of the battery case 1 to isolate the internal environment of the battery cell 10 from the external environment.
  • the shape of the end cap 2 can be adapted to the shape of the battery case 1 to fit the battery case 1 .
  • the end cap 2 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 2 is not easily deformed when subjected to extrusion and collision, so that the battery cell 10 can have higher structural strength. Safety features could also be improved.
  • the end cap 2 may be provided with functional components such as electrode terminals. The electrode terminals may be used to electrically connect with the electrode assembly 4 for outputting or inputting electrical energy of the battery cell 10 .
  • the end cap 2 may also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value.
  • the end cap 2 can also be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiments of the present application.
  • an insulating member may also be provided inside the end cover 2 , and the insulating member may be used to isolate the electrical connection components in the battery case 1 from the end cover 2 to reduce the risk of short circuit.
  • the insulating member may be plastic, rubber, etc.
  • the battery case 1 is a component used to cooperate with the end cover 2 to form an internal environment of the battery cell 10 , wherein the formed internal environment can be used to accommodate the electrode assembly 4 , electrolyte and other components.
  • the battery case 1 and the end cover 2 can be independent components, and an opening 11b can be provided on the battery case 1.
  • the end cover 2 covers the opening 11b at the opening 11b to form the internal environment of the battery cell 10.
  • the end cover 2 and the battery case 1 can also be integrated.
  • the end cover 2 and the battery case 1 can form a common connection surface before other components are inserted into the case. When it is necessary to encapsulate the inside of the battery case 1 , then cover the battery case 1 with the end cover 2.
  • the battery case 1 can be of various shapes and sizes, such as rectangular parallelepiped, cylinder, hexagonal prism, etc. Specifically, the shape of the battery case 1 can be determined according to the specific shape and size of the electrode assembly 4 .
  • the battery case 1 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in the embodiments of the present application.
  • the poles on the end cap 2 can be electrically connected to the tabs of the electrode assembly 4 through the adapter 3 .
  • the electrode assembly 4 is a component in the battery cell 10 where electrochemical reactions occur.
  • One or more electrode assemblies 4 may be contained within the battery case 1 .
  • the electrode assembly 4 is mainly formed by winding or stacking positive electrode sheets and negative electrode sheets, and a separator is usually provided between the positive electrode sheets and the negative electrode sheets.
  • the portions of the positive electrode sheet and the negative electrode sheet that contain active material constitute the main body of the electrode assembly 4 , and the portions of the positive electrode sheet and the negative electrode sheet that do not contain active material each constitute tabs.
  • the positive electrode tab and the negative electrode tab can be located together at one end of the main body or respectively located at both ends of the main body.
  • the present application provides a battery case 1 for a battery cell 10 .
  • the battery case 1 includes a case body 11 and a reinforcement 14 .
  • the housing body 11 is provided with a chamber 11a having an opening 11b at its end.
  • the chamber 11a is used to accommodate the electrode assembly 4.
  • the shell body 11 includes a first side wall 12 and a second side wall 13 arranged around the edge of the opening 11b.
  • the first side wall 12 is provided with a reinforcing member 14 extending along the first direction X.
  • the second side wall 13 is provided with a reinforcing member 14 extending along the second direction Y; where the first direction X intersects with the second direction Y.
  • the first side wall 12 and the second side wall 13 are arranged around the edge of the opening 11 b on the shell body 11 , that is, the two side walls are arranged along the periphery of the opening 11 b instead of being located away from the shell body 11 and facing away from the opening 11 b. on one side.
  • the first side wall 12 and the second side wall 13 are arranged adjacent to each other; or the first side wall 12 and the second side wall 13 are spaced apart. Arrangement etc.
  • first direction X and the second direction Y are also various designs.
  • first direction X is consistent with the length direction of the shell body 11
  • second direction Y is consistent with the width direction of the shell body 11
  • first direction X and the second direction Y are designed along diagonal directions on the shell body 11, etc. .
  • the reinforcement 14 refers to a component that is disposed on the first side wall 12 or the second side wall 13 and can increase the structural rigidity of the shell body 11.
  • the material of the reinforcement 14 can be consistent with the material of the shell body 11, or it can be inconsistent.
  • the cross-sectional shape of the reinforcement 14 may be, but is not limited to, a polygon, a semicircle, a trapezoid-like regular shape, or other irregular shapes.
  • the reinforcement 14 can be fixed on the first side wall 12 or the second side wall 13 in a combined manner, or can be fixed on the first side wall 12 or the second side wall 13 in an integral manner.
  • the combination method can be but not limited to bolted connection, clamping, riveting, welding, etc.; and the integrated molding method can be die-casting, casting, extrusion and other processes.
  • the reinforcement 14 can be provided on the side of the case body 11 facing the chamber 11a, that is, the inner surface of the battery case 1; it can also be provided on the side of the case body 11 facing away from the chamber 11a, that is, the inner surface of the battery case 1. The outer surface.
  • the reinforcement 14 When the reinforcement 14 is disposed on the side of the case body 11 facing away from the chamber 11a, the reinforcement 14 will not affect the internal space of the battery case 1, ensuring that the group margin inside the battery cell 10 remains unchanged.
  • These two types of reinforcements 14 can inhibit the deformation of the battery case 1 in two directions, greatly improving the structural strength of the battery case 1, avoiding serious structural deformation before welding, and ensuring smooth progress of the welding operation.
  • the first side wall 12 is adjacent to the second side wall 13, and the first side wall 12 is a side wall of the shell body 11 perpendicular to the preset direction Z; wherein, The preset direction Z is consistent with the thickness direction of the electrode assembly 4 .
  • Adjacent means that two objects are adjacent and connected to each other, or they can also be closely connected, that is, the first side wall 12 and the second side wall 13 are adjacent to and directly connected to each other.
  • the thickness direction of the electrode assembly 4 should be understood as the direction from the large surface on one side to the large surface on the other side of the electrode assembly 4 .
  • the “large surface” refers to the side surface of the electrode assembly 4 with a larger area. Of course, it can also be understood as the large surface area formed on the electrode assembly 4 during winding or lamination.
  • the first side wall 12 is the large surface of the housing body 11
  • the second side wall 13 is the smaller side surface of the housing body 11 .
  • the side wall of the shell body 11 along the preset direction Z is usually a large surface, that is, the side opposite to the large surface of the electrode assembly 4, and its deformation amount is also relatively large.
  • the first side wall 12 is defined as On the large surface, the reinforcing member 14 is used to strengthen the structural rigidity of the large surface on the shell body 11 and reduce the deformation amount of this surface.
  • the second direction Y is defined as perpendicular to the plane where the opening 11 b is located.
  • the first direction X is defined as perpendicular to the plane formed between the second direction Y and the preset direction Z.
  • the second direction Y is perpendicular to the plane where the opening 11b is located, which can be understood as the second direction Y is consistent with the height direction of the shell body 11;
  • the first direction X is perpendicular to the plane formed between the second direction Y and the preset direction Z, which can be understood as It is understood that the first direction X is consistent with the length direction of the shell body 11 .
  • the preset direction Z intersects with the first direction X non-perpendicularly, and may also be designed vertically. Specifically, in some embodiments, the first direction X, the second direction Y and the preset direction Z are arranged perpendicularly to each other.
  • the first side wall 12 there are multiple reinforcing members 14, and all the reinforcing members 14 are arranged at intervals along the second direction Y.
  • the number of reinforcing members 14 may be two, three or more.
  • the number of reinforcing members 14 may be any value from 2 to 2000.
  • Arranging a plurality of reinforcement members 14 at intervals along the second direction Y is conducive to further improving the structural rigidity of the first side wall 12 and effectively avoiding structural deformation before welding.
  • the distance between two adjacent reinforcement members 14 is marked as D1.
  • the width of the first side wall 12 along the second direction Y is denoted as K1, where 0.03*K1 ⁇ D1 ⁇ 0.7*K1.
  • the distance D1 between two adjacent reinforcements 14 will affect the number of reinforcements 14 on the first side wall 12. For example, when the distance D1 occupies 3% of the width K1, a larger number of reinforcements 14 can be distributed on the first side wall 12. There are many reinforcement members 14 , and when the distance D1 occupies 70% of the width K1 , relatively few reinforcement members 14 can be distributed on the first side wall 12 .
  • the ratio between the distance D1 and the width K1 is reasonably controlled to ensure an appropriate number of reinforcements 14 on the first side wall 12 so that the first side wall 12 can take into account both the overall structural strength and the overall weight.
  • the condition that the distance D1 meets is: 0.1mm ⁇ D1 ⁇ 200mm.
  • the distance D1 between two adjacent reinforcements 14 is designed to be too small, the reinforcements 14 on the first side wall 12 will be too dense. Although the structural rigidity can be improved, the weight of the overall structure will increase significantly, and the battery will also increase. Production cost of shell 1. If the distance D1 between two adjacent reinforcement members 14 is designed to be too large, the structural deformation between the two adjacent reinforcement members 14 cannot be effectively suppressed, resulting in the flatness of the battery case 1 not being effectively controlled.
  • the distance D1 between two adjacent reinforcements 14 can take any value from 0.1mm to 200mm.
  • the distance D1 can be but not limited to 0.1mm, 1mm, 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 100mm, 150mm, 200mm, etc.
  • the distance D1 may be any value from 5 mm to 10 mm.
  • the outermost reinforcing members 14 located in the second direction Y are respectively the reinforcing members 14 located in the first and last layers among all the reinforcing members 14 arranged on the first side wall 12 .
  • the distance J1 can take any value from 0.1mm to 200mm.
  • the distance J1 can be but not limited to 0.1mm, 1mm, 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 100mm, 150mm, 200mm, etc.
  • the distance J1 can be any value from 10 mm to 20 mm.
  • Spacing is reserved at the top and bottom of the first side wall 12 to prevent the reinforcement 14 from being located on the edge of the first side wall 12, which would increase the difficulty of manufacturing the reinforcement 14. At the same time, leaving a spacing also facilitates the electrode assembly. 4 top and bottom for heat dissipation.
  • any end of the reinforcement 14 along the first direction X and the corresponding side of the first side wall 12 along the first direction X are The distance between the sides is recorded as J2, where 0.1mm ⁇ J2 ⁇ 200mm.
  • the reinforcement 14 If the distance between one end of the reinforcement 14 and one side of the first side wall 12 is too large, a large area of the first side wall 12 cannot be reinforced, resulting in an increase in deformation of this part; if the reinforcement is If the distance between one end of the member 14 and one side of the first side wall 12 is too small, one end of the reinforcing member 14 will extend close to the edge of the first side wall 12, which will easily cause structural interference to the edge of the battery case 1, and will not cause structural interference to the edge of the battery case 1. Conducive to molding processing.
  • the distance J2 can take any value from 0.1mm to 200mm.
  • the distance J2 can be but not limited to 0.1mm, 1mm, 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 100mm, 150mm, 200mm, etc.
  • the distance J2 can be any value from 10 mm to 20 mm.
  • Reasonable control of the extension length of the reinforcement 14 can not only effectively reinforce the first side wall 12 but also avoid structural interference caused by the reinforcement 14 being too long, which is beneficial to the molding process.
  • the width of the reinforcement 14 along the second direction Y is denoted as W1, where 0.01mm ⁇ W1 ⁇ 50mm.
  • the width W1 of the reinforcement 14 may be, but is not limited to, 0.01 mm, 0.1 mm, 1 mm, 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, etc.
  • the width dimension of the reinforcement 14 is reasonably designed to facilitate the installation of the required number of reinforcements 14 in the second direction Y to ensure that the first side wall 12 has sufficient structural rigidity.
  • the height of the reinforcement 14 protruding from the first side wall 12 is marked as H1, where 0.01mm ⁇ H1 ⁇ 5mm.
  • the height H1 of the reinforcement 14 may be, but is not limited to, 0.01mm, 0.1mm, 1mm, 2mm, 3mm, 4mm, 5mm, etc.
  • the height dimension of the reinforcement 14 should be designed reasonably to avoid protruding too high and occupying the space inside the battery 100, thereby avoiding affecting the energy density of the battery 100.
  • FIG. 8 In the second side wall 13 , there are multiple reinforcing members 14 , and all the reinforcing members 14 are arranged at intervals along the preset direction Z.
  • the number of reinforcing members 14 may be two, three or more.
  • the number of reinforcing members 14 may be any value from 2 to 2000.
  • Arranging a plurality of reinforcement members 14 at intervals along the preset direction Z is conducive to further improving the structural rigidity of the second side wall 13 and effectively avoiding structural deformation before welding.
  • the distance between two adjacent reinforcement members 14 is marked as D2.
  • the width of the second side wall 13 along the preset direction Z is denoted as K2, where 0.03*K2 ⁇ D2 ⁇ 0.7*K2.
  • the size of the distance D1 between two adjacent reinforcements 14 will affect the number of reinforcements 14 on the second side wall 13. For example, when the size of the distance D1 occupies 3% of the width K1, a larger number of reinforcements 14 can be distributed on the second side wall 13. There are many reinforcement members 14 , and when the distance D1 occupies 70% of the width K1 , relatively few reinforcement members 14 can be distributed on the second side wall 13 .
  • the ratio between the distance D2 and the width K2 is reasonably controlled to ensure an appropriate number of reinforcements 14 on the second side wall 13 so that the second side wall 13 can take into account both the overall structural strength and the overall weight.
  • the distance D2 between two adjacent reinforcements 14 is designed to be too small, the reinforcements 14 on the second side wall 13 will be too dense. Although the structural rigidity can be improved, the weight of the overall structure will increase significantly, and the battery will also increase. Production cost of shell 1. If the distance D2 between two adjacent reinforcement members 14 is designed to be too large, the structural deformation between the two adjacent reinforcement members 14 cannot be effectively suppressed, resulting in the flatness of the battery case 1 not being effectively controlled.
  • the distance D2 between two adjacent reinforcement members 14 can take any value from 0.1mm to 200mm, for example: the distance D1 can be but not limited to 0.1mm, 1mm, 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 100mm, 150mm, 200mm, etc. Specifically, in some embodiments, the distance D2 may be any value from 5 mm to 10 mm.
  • the distance between two adjacent reinforcements 14 is reasonably controlled to increase the structural strength of the second side wall 13 of the battery case 1 and reduce the amount of structural deformation while ensuring reasonable manufacturing costs.
  • the reinforcements 14 located on either side of the outermost two sides in the preset direction Z are in contact with the second side wall 14 .
  • the distance between the corresponding sides of the wall 13 along the preset direction Z is marked as J3, where 0.1mm ⁇ J3 ⁇ 200mm.
  • the outermost reinforcing members 14 located in the preset direction Z are respectively the reinforcing members 14 located in the first and last layers among all the reinforcing members 14 arranged on the second side wall 13 .
  • the distance J3 can take any value from 0.1mm to 200mm.
  • the distance J3 can be but not limited to 0.1mm, 1mm, 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 100mm, 150mm, 200mm, etc.
  • the distance J3 can be any value from 10 mm to 20 mm.
  • Spacing is reserved on both the left and right sides of the second side wall 13 to prevent the reinforcing member 14 from being opened on the edge of the second side wall 13 and thereby increasing the difficulty of manufacturing the reinforcing member 14 .
  • the reinforcement 14 is along either end in the second direction Y and the corresponding second side wall 13 is along one side in the second direction Y.
  • the distance between the sides is recorded as J4, where 0.1mm ⁇ J4 ⁇ 200mm.
  • the distance J4 can take any value from 0.1mm to 200mm.
  • the distance J4 can be but not limited to 0.1mm, 1mm, 5mm, 10mm, 20mm, 30mm, 40mm, 50mm, 100mm, 150mm, 200mm, etc.
  • the distance J4 can be any value from 10 mm to 20 mm.
  • Reasonable control of the extension length of the reinforcement 14 can not only effectively reinforce the second side wall 13 but also avoid structural interference caused by the reinforcement 14 being too long, which is beneficial to the molding process.
  • the width of the reinforcement 14 along the preset direction Z is denoted as W2, where 0.01mm ⁇ W2 ⁇ 50mm.
  • the width W2 of the reinforcement 14 may be, but is not limited to, 0.01 mm, 0.1 mm, 1 mm, 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, etc.
  • the width of the reinforcement 14 is reasonably designed to facilitate the installation of the required number of reinforcements 14 in the preset direction Z to ensure that the second side wall 13 has sufficient structural rigidity.
  • the height of the reinforcement 14 protruding from the second side wall 13 is marked as H2, where 0.01mm ⁇ H2 ⁇ 5mm.
  • the height H2 of the reinforcement 14 may be, but is not limited to, 0.01mm, 0.1mm, 1mm, 2mm, 3mm, 4mm, 5mm, etc.
  • the height dimension of the reinforcement 14 should be designed reasonably to avoid protruding too high and occupying the space inside the battery 100, thereby avoiding affecting the energy density of the battery 100.
  • FIG. 4 there are at least two first side walls 12 and second side walls 13 .
  • the two second side walls 13 are respectively spaced between the two first side walls 12.
  • At least one first side wall 12 is provided with a reinforcing member 14 extending along the first direction X.
  • the upper edge of the at least one second side wall 13 The reinforcing member 14 extends in the second direction Y.
  • the number of the first side walls 12 and the second side walls 13 may be two, three or more.
  • the two second side walls 13 are spaced apart and connected between the two first side walls 12 along the first direction X to form the chamber 11a.
  • the battery case 1 has a quadrangular prism structure; when there are more than two first side walls 12 and second side walls 13 , it is only necessary to ensure that two of the second side walls 13 are spaced between the two first side walls 12
  • the remaining first side wall 12 is connected to one first side wall 12 and the second side wall in sequence. 13; connect the remaining second side walls 13 in sequence between a first side wall 12 and a second side wall 13, etc.
  • At least one first side wall 12 and the second side wall 13 are provided with reinforcing members 14 extending in different directions to enhance the overall structural strength of the battery case 1 .
  • all reinforcing members 14 are provided on the side of the first side wall 12 facing away from the chamber 11 a.
  • the reinforcing members 14 are arranged on the side of the first side wall 12 facing away from the chamber 11a, that is, the reinforcing members 14 of the first side wall 12 are all located on the outer surface of the case body 11, so that the reinforcing members 14 will not affect the interior of the battery case 1.
  • the space has an impact and ensures that the group margin inside the battery cell 10 remains unchanged.
  • the reinforcement 14 is disposed on the side of the first side wall 12 facing away from the chamber 11a to avoid affecting the internal space of the battery case 1 and ensure that the group margin inside the battery cell 10 remains unchanged.
  • all reinforcing members 14 are provided on the side of the second side wall 13 facing away from the chamber 11 a.
  • the reinforcing members 14 are arranged on the side of the second side wall 13 facing away from the chamber 11a, that is, the reinforcing members 14 of the second side wall 13 are all located on the outer surface of the case body 11, so that the reinforcing members 14 will not affect the inside of the battery case 1.
  • the space has an impact and ensures that the group margin inside the battery cell 10 remains unchanged.
  • the reinforcement 14 is disposed on the side of the second side wall 13 facing away from the chamber 11a to avoid affecting the internal space of the battery case 1 and ensure that the group margin inside the battery cell 10 remains unchanged.
  • At least a portion of the first side wall 12 protrudes from one side of the first side wall 12 along its thickness direction to form a reinforcement 14 , and leaves a reinforcement 14 on the other side of the first side wall 12 .
  • the cross-sectional shape of the first recess 15 can be designed in various ways.
  • the cross-sectional shape of the first recess 15 can be, but is not limited to, semicircle, semi-oval, trapezoid, square or rectangle.
  • the molding method of the first side wall 12 can be die-casting, stamping, embossing, etc., without reducing or damaging the shell structure; of course, it can also be turned, milled, or embossed.
  • the reinforcement 14 is processed by excavation methods such as milling.
  • the first recess 15 can be disposed on the outer surface of the first side wall 12 or on the inner surface; of course, it can also be disposed on both the inner and outer surfaces of the first side wall 12 , that is, the first recess 15 can be disposed on the outer surface of the first side wall 12 .
  • the reinforcements 14 are arranged crosswise inside and outside.
  • the space capacity in the chamber 11a can be effectively increased, which is beneficial to improving the performance of the battery 100.
  • the outer convex reinforcement 14 matches the heat insulation pad or adhesive glue with compression characteristics of the module, which can effectively enhance the battery cells 10 and the battery cells 10 , the battery cells 10 and the glue, and the battery cells 10 in the module.
  • the mechanical engagement and assembly strength with the thermal insulation pad can effectively increase the tolerance threshold for battery cells with a flatness of 10 degrees.
  • Such a design is conducive to simplifying the molding process of the reinforcement 14 and improving the processing efficiency of the battery case 1; at the same time, while strengthening the structural strength, the weight of the battery case 1 will not be increased.
  • At least a part of the second side wall 13 protrudes along the thickness direction of the second side wall 13 to form a reinforcement 14 on one side of the second side wall 13 , and leaves a reinforcement 14 on the other side of the second side wall 13 .
  • the cross-sectional shape of the second recessed portion 16 can be designed in various ways.
  • the cross-sectional shape of the second recessed portion 16 can be, but is not limited to, semicircle, semiellipse, trapezoid, square or rectangle.
  • the molding method of the second side wall 13 can be die-casting, stamping, embossing, etc., without reducing or damaging the shell structure; of course, it can also be turned, milled, or embossed.
  • the reinforcement 14 is processed by excavation methods such as milling.
  • the second recess 16 can be disposed on the outer surface of the second side wall 13 or on the inner surface; of course, it can also be disposed on both the inner and outer surfaces of the second side wall 13 , that is, the second recess 16 can be disposed on the outer surface of the second side wall 13 .
  • the reinforcements 14 are arranged crosswise inside and outside. When the second recess 16 is formed on the side of the second side wall 13 facing the chamber 11a, the space capacity in the chamber 11a can be effectively increased, which is beneficial to improving the performance of the battery 100.
  • Such a design is conducive to simplifying the molding process of the reinforcement 14 and improving the processing efficiency of the battery case 1; at the same time, while strengthening the structural strength, the weight of the battery case 1 will not be increased.
  • the present application provides a battery cell 10, including: an electrode assembly 4 and the battery case 1 in any of the above solutions.
  • the electrode assembly 4 is accommodated in the chamber 11a.
  • the present application provides a battery 100 including the battery cell 10 in the above solution.
  • the present application provides an electrical device, including the battery 100 in the above solution, and the battery 100 is used to provide electric energy.
  • This application provides a battery case 1.
  • the battery case 1 is provided with transverse reinforcements 14 on a large surface, and longitudinal reinforcements 14 are provided on the sides of the battery case 1.
  • the reinforcing member 14 preferably protrudes from the large outer wall of the electrode assembly 4 to avoid occupying internal space.
  • a number of reinforcements 14 are arranged in the battery case 1 in an alternating internal and external structure, that is, some reinforcements 14 are provided inside the battery case 1 and some reinforcements 14 are provided outside the battery case 1 .
  • all reinforcing members 14 adopt an outward convex design.

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

Abstract

La présente demande concerne un boîtier de batterie, un élément de batterie, une batterie et un dispositif électrique. Des premières parois latérales sont pourvues d'éléments de renforcement s'étendant dans une première direction. Des secondes parois latérales sont pourvues d'éléments de renforcement s'étendant dans une seconde direction, la première direction croisant la seconde direction. Les éléments de renforcement sont respectivement disposés sur au moins deux parois latérales, c'est-à-dire les premières parois latérales et les secondes parois latérales, qui entourent un bord d'une ouverture, de telle sorte que les structures des deux parois latérales ou plus du boîtier de batterie sont renforcées. Les éléments de renforcement sur les premières parois latérales s'étendent dans la première direction, les éléments de renforcement sur les secondes parois latérales s'étendent dans la seconde direction, et la première direction croise la seconde direction ; par conséquent, les deux types d'éléments de renforcement peuvent limiter la déformation du boîtier de batterie dans les deux directions, ce qui permet d'améliorer considérablement la résistance structurale du boîtier de batterie, d'éviter une déformation structurale grave avant soudage et d'assurer une opération de soudage régulière.
PCT/CN2022/118743 2022-07-28 2022-09-14 Boîtier de batterie, élément de batterie, batterie et dispositif électrique WO2024021249A1 (fr)

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Application Number Priority Date Filing Date Title
CN202221961074.8U CN217589215U (zh) 2022-07-28 2022-07-28 电池壳、电池单体、电池及用电装置
CN202221961074.8 2022-07-28

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5492779A (en) * 1994-10-24 1996-02-20 General Motors Corporation Heat dissipating battery
KR20060037845A (ko) * 2004-10-28 2006-05-03 삼성에스디아이 주식회사 이차 전지
US20090269657A1 (en) * 2008-04-25 2009-10-29 Honda Motor Co., Ltd. Electricity storage system and metal battery case manufacturing method
JP2013089369A (ja) * 2011-10-14 2013-05-13 Furukawa Battery Co Ltd:The 制御弁式鉛蓄電池
CN109818038A (zh) * 2017-11-21 2019-05-28 丰田自动车株式会社 电池组和电池组所用的单电池的制造方法
CN214280091U (zh) * 2021-01-29 2021-09-24 常州瑞德丰精密技术有限公司 一种壳体及动力电池
CN216015542U (zh) * 2021-09-06 2022-03-11 东莞市精聚五金制品有限公司 一种锂电池壳体及其锂电池
CN216872119U (zh) * 2022-02-23 2022-07-01 宁德时代新能源科技股份有限公司 电池单体的壳体、电池单体、电池和用电设备

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5492779A (en) * 1994-10-24 1996-02-20 General Motors Corporation Heat dissipating battery
KR20060037845A (ko) * 2004-10-28 2006-05-03 삼성에스디아이 주식회사 이차 전지
US20090269657A1 (en) * 2008-04-25 2009-10-29 Honda Motor Co., Ltd. Electricity storage system and metal battery case manufacturing method
JP2013089369A (ja) * 2011-10-14 2013-05-13 Furukawa Battery Co Ltd:The 制御弁式鉛蓄電池
CN109818038A (zh) * 2017-11-21 2019-05-28 丰田自动车株式会社 电池组和电池组所用的单电池的制造方法
CN214280091U (zh) * 2021-01-29 2021-09-24 常州瑞德丰精密技术有限公司 一种壳体及动力电池
CN216015542U (zh) * 2021-09-06 2022-03-11 东莞市精聚五金制品有限公司 一种锂电池壳体及其锂电池
CN216872119U (zh) * 2022-02-23 2022-07-01 宁德时代新能源科技股份有限公司 电池单体的壳体、电池单体、电池和用电设备

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