WO2024065205A1 - Élément de batterie, batterie et appareil électrique - Google Patents

Élément de batterie, batterie et appareil électrique Download PDF

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Publication number
WO2024065205A1
WO2024065205A1 PCT/CN2022/121846 CN2022121846W WO2024065205A1 WO 2024065205 A1 WO2024065205 A1 WO 2024065205A1 CN 2022121846 W CN2022121846 W CN 2022121846W WO 2024065205 A1 WO2024065205 A1 WO 2024065205A1
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WO
WIPO (PCT)
Prior art keywords
battery cell
along
battery
reinforcement portion
side walls
Prior art date
Application number
PCT/CN2022/121846
Other languages
English (en)
Chinese (zh)
Inventor
石胜云
郭志君
王鹏
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.)
Filing date
Publication date
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 CN202280086537.7A priority Critical patent/CN118511367A/zh
Priority to PCT/CN2022/121846 priority patent/WO2024065205A1/fr
Publication of WO2024065205A1 publication Critical patent/WO2024065205A1/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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/289—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs
    • H01M50/291—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by spacing elements or positioning means within frames, racks or packs characterised by their shape
    • 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, and in particular to a battery cell, a battery and an electrical device.
  • the battery includes a box and a plurality of battery cells contained in the box.
  • the battery cell is assembled into an electrode assembly (bare battery cell) by winding or laminating the positive electrode sheet, the negative electrode sheet and the diaphragm, and then loaded into the shell, and then covered with the end cover, and finally injected with the electrolyte.
  • the battery cells in the prior art have the phenomenon of greater assembly difficulty and poor assembly quality when they are assembled into batteries in the box, which is not conducive to improving the production efficiency of the battery and ensuring the production quality of the battery.
  • the embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the production efficiency and production quality of the battery.
  • an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly and an end cover; the shell comprises a plurality of wall portions, and the plurality of wall portions enclose a storage space having an opening; the electrode assembly is accommodated in the storage space; the end cover covers the opening; wherein at least one of the wall portions has a reinforcement portion protruding from a surface facing the storage space.
  • the shell has multiple wall portions, and the multiple wall portions enclose a storage space for accommodating the electrode assembly.
  • the structural strength of the wall portion of the shell can be effectively improved to alleviate the deformation of the wall portion of the shell due to the internal and external pressure difference during the production, assembly or use of the battery cell, which is beneficial to reduce the inward or outward convexity of the outer surface of the shell to ensure the flatness of the outer surface of the shell.
  • the battery cell when the battery cell is assembled into a battery, it can facilitate the outer surface of the shell of the battery cell to be bonded to other components, such as a box body, to reduce the phenomenon of insufficient glue or overflow of glue between the shell and other components, thereby effectively reducing the difficulty of battery assembly, which is beneficial to improving the production efficiency of the battery, and can effectively increase the bonding area between the shell and other components to ensure the bonding strength between the shell and other components, which is beneficial to improving the production quality of the battery.
  • it can alleviate the phenomenon of debonding between the shell and other components due to deformation of the shell during use of the battery cell, thereby helping to improve the stability and reliability of the battery cell.
  • the plurality of wall portions include a plurality of side walls connected end to end in sequence, the plurality of side walls surround the outside of the electrode assembly, and along the first direction, at least one end of the plurality of side walls encloses the opening to form the opening; wherein the reinforcement portion includes a first reinforcement portion, and at least one of the side walls is provided with the first reinforcement portion.
  • the multiple wall portions include multiple side walls connected end to end in sequence, that is, the multiple side walls are the parts of the shell surrounding the outside of the electrode assembly.
  • the first reinforcement portion extends along the first direction.
  • the shell adopting this structure can effectively increase the reinforcement effect of the first reinforcement part on the side wall to ensure the structural strength of the side wall, thereby further reducing the deformation of the side wall.
  • a distance between an end of the first reinforcement portion close to the opening and the opening is L 1 , satisfying L 1 ⁇ 1.5 mm.
  • the distance between the first reinforcement part and the opening in the first direction greater than or equal to 1.5 mm, that is, in the first direction, there is a gap between the first reinforcement part and the opening, and the gap width is greater than or equal to 1.5 mm, when the end cover of the shell is covered on the opening of the shell and assembled with the shell, the interference effect of the first reinforcement part on the end cover can be reduced, which is beneficial to improve the assembly quality between the end cover and the shell.
  • a distance between one end of the first reinforcement portion close to the opening and the opening is L 1
  • a height of the side wall is L 2 , satisfying L 1 ⁇ 0.5 ⁇ L 2 .
  • the distance between the end of the first reinforcement part close to the opening in the first direction and the opening is less than or equal to half of the height of the side wall in the first direction, that is, the reinforcement area of the side wall by the first reinforcement part in the first direction is greater than or equal to half of the side wall, it is possible to effectively ensure that the side wall has a sufficient area to be reinforced by the first reinforcement part, which is beneficial to further improve the structural strength of the side wall.
  • the multiple wall portions also include a bottom wall, and the multiple side walls are arranged around the bottom wall.
  • the first reinforcement portion includes a first section, and along the first direction, the first section extends from one end of the first reinforcement portion close to the opening toward the bottom wall, and the thickness in the thickness direction of the side wall gradually increases.
  • the first reinforcement portion has a first section extending in the first direction from one end of the first reinforcement portion close to the opening toward the direction close to the bottom wall, and the thickness of the first section gradually increases, that is, the first reinforcement portion has a slope formed in the area close to the opening in the first direction.
  • the first reinforcement portion also includes a second section; the second section is connected to the first section, and along the first direction, the second section extends from an end of the first section away from the opening toward a direction close to the bottom wall, and the thickness in the thickness direction of the side wall remains unchanged.
  • the first reinforcement part is provided with two parts, namely a first section and a second section arranged along the first direction, the first section is closer to the opening than the second section, and the first section is a structure in which the thickness gradually increases from one end close to the opening to the first end connected to the second section, and the second section is a structure in which the thickness remains unchanged.
  • the first reinforcement part with such a structure can guide the electrode assembly when the electrode assembly is assembled into the shell while ensuring the structural strength of the first reinforcement part itself.
  • the first section is the first reinforcement portion.
  • the first section is the first reinforcement portion, that is, the thickness of the first reinforcement portion gradually increases in the first direction from the end close to the opening to the end close to the bottom wall.
  • the first reinforcement portion with this structure can better guide the electrode assembly when the electrode assembly is assembled into the shell.
  • the multiple side walls include two first side walls and two second side walls, the two first side walls are arranged opposite to each other along the second direction, the two second side walls are arranged opposite to each other along the third direction, one first side wall, one second side wall, another first side wall and another second side wall are connected end to end in sequence, and the first direction, the second direction and the third direction are perpendicular to each other; wherein the area of the surface of the second side wall facing the accommodating space is larger than the area of the surface of the first side wall facing the accommodating space, and at least one of the first side walls is provided with the first reinforcement portion.
  • the multiple side walls of the shell are respectively two first side walls arranged opposite to each other along the second direction and two second side walls arranged opposite to each other along the third direction, and the area of the inner surface of the first side wall is smaller than the area of the inner surface of the second side wall, that is, the inner surface of the second side wall is the surface with the largest area among the inner surfaces of the shell.
  • the first reinforcement portion is set on the first side wall to increase the structural strength of the first side wall, so as to reduce the deformation of the first side wall, and then the flatness of the first side wall can be ensured, so as to improve the bonding quality between the first side wall and other components.
  • the battery cell includes a plurality of electrode assemblies, and the plurality of electrode assemblies are stacked along the third direction; the electrode assembly includes a straight portion and an arc-shaped portion connected to one end of the straight portion along the second direction, and an escape space is formed between the arc-shaped portions of two adjacent electrode assemblies along the third direction, and the first reinforcement portion is arranged opposite to the escape space along the second direction.
  • multiple electrode assemblies located in the accommodating space are stacked along the third direction, and the electrode assemblies include a straight portion and an arc-shaped portion, so that an avoidance space can be formed between the arc-shaped portions of two stacked and adjacent electrode assemblies.
  • the avoidance space can avoid the first reinforcement portion.
  • the battery cell adopting this structure can achieve the mutual avoidance of the first reinforcement portion and the arc-shaped portion of the electrode assembly, so as to reduce the risk of collision or scratching between the electrode assembly and the first reinforcement portion, which is beneficial to improving the assembly quality of the battery cell.
  • the width of the first reinforcing portion is D 1
  • the thickness of the straight portion is D 2 , satisfying D 1 ⁇ D 2 .
  • both ends of the first reinforcement part do not exceed the farthest ends of the two adjacent electrode assemblies in the second direction, so that the first reinforcement part can be located as a whole in the avoidance space, thereby further reducing the risk of collision or scratch between the electrode assembly and the first reinforcement part.
  • a plurality of first reinforcing portions are disposed on a surface of the first side wall facing the accommodating space, the plurality of first reinforcing portions are spaced apart along the third direction, and one first reinforcing portion is correspondingly disposed for each avoidance space.
  • a plurality of first reinforcement portions are arranged on the first side wall at intervals along the third direction, and each reinforcement portion is arranged corresponding to an avoidance space, thereby reducing the collision or scratch between the electrode assembly and the first reinforcement portion and further improving the structural strength of the first side wall, so as to alleviate the deformation of the first side wall during the production, assembly or use of the battery cell.
  • the multiple wall portions include a bottom wall and multiple side walls; the multiple side walls are arranged around the bottom wall, the bottom wall and the multiple side walls jointly define the accommodating space, and along the first direction, the opening is arranged opposite to the bottom wall; wherein the reinforcement portion includes a second reinforcement portion, and the second reinforcement portion is arranged on the bottom wall.
  • the multiple wall portions include a bottom wall and multiple side walls arranged around the bottom wall, that is, the shell is surrounded by the bottom wall and the multiple side walls arranged around the bottom wall.
  • the battery cell further includes a separator; the separator is disposed between the bottom wall and the electrode assembly along the first direction to separate the bottom wall and the electrode assembly.
  • a separator is provided between the electrode assembly and the bottom wall so that the separator can separate the bottom wall from the electrode assembly to reduce the short circuit between the electrode assembly and the bottom wall, thereby facilitating the improvement of the safety of the battery cell.
  • a surface of the partition facing the bottom wall is provided with a receiving groove, and at least a portion of the second reinforcement portion is received in the receiving groove.
  • a receiving groove for accommodating at least part of the second reinforcement portion is provided on the surface of the separator facing the bottom wall in the first direction.
  • a separator with such a structure can effectively reduce the space occupied by the second reinforcement portion and the separator in the first direction, thereby facilitating optimizing the size of the battery cell in the first direction to improve the energy density of the battery cell.
  • a depth of the accommodating groove is greater than or equal to a thickness of the second reinforcing portion.
  • the groove depth of the accommodating groove in the first direction is set to be greater than or equal to the thickness of the second reinforcement portion, that is, the second reinforcement portion can be accommodated as a whole in the accommodating groove in the first direction, it is beneficial to further reduce the space occupied by the second reinforcement portion and the separator in the first direction, so as to optimize the size of the battery cell in the first direction.
  • the second reinforcement portion extends along the second direction
  • the partition includes two partitions, and along the third direction, the two partitions are respectively arranged on both sides of the second reinforcement portion, and the first direction, the second direction and the third direction are perpendicular to each other.
  • the separator is provided with two separators, and the two separators are respectively arranged on both sides of the reinforcement part in the third direction, so that the second reinforcement part is accommodated between the two separators, so that the two separators can cooperate to separate the electrode assembly and the bottom wall.
  • the separator with this structure effectively reduces the space occupied by the second reinforcement part and the separator in the first direction, which is beneficial to optimize the size of the battery cell in the first direction to improve the energy density of the battery cell.
  • a thickness of the separator is greater than or equal to a thickness of the second reinforcing portion.
  • the thickness of the separator in the first direction is set to be greater than or equal to the thickness of the second reinforcement portion, that is, the second reinforcement portion can be accommodated as a whole in the gap formed between the two separators in the first direction, which is beneficial to further reduce the space occupied by the second reinforcement portion and the separator in the first direction, so as to optimize the size of the battery cell in the first direction.
  • an embodiment of the present application further provides a battery, comprising the above-mentioned battery cell.
  • an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery.
  • FIG1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application.
  • FIG2 is an exploded view of a battery structure provided in some embodiments of the present application.
  • FIG3 is a schematic diagram of the assembly of a battery cell and a box body provided in some embodiments of the present application.
  • FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application.
  • FIG5 is a schematic diagram of the structure of a housing provided in some embodiments of the present application.
  • FIG6 is a cross-sectional view of a housing provided in some embodiments of the present application in a direction perpendicular to a third direction;
  • FIG7 is a partial enlarged view of the portion A of the housing shown in FIG6 ;
  • FIG8 is a cross-sectional view of a housing provided in some embodiments of the present application in a direction perpendicular to the second direction;
  • FIG9 is a schematic structural diagram of a housing provided in some other embodiments of the present application.
  • FIG10 is a cross-sectional view of a housing provided in some other embodiments of the present application in a direction perpendicular to a third direction;
  • FIG11 is a partial enlarged view of a portion B of the housing shown in FIG10 ;
  • FIG12 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application.
  • FIG13 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application.
  • FIG14 is a partial enlarged view of the C portion of the housing shown in FIG8;
  • FIG15 is a cross-sectional view of a separator provided in some embodiments of the present application.
  • FIG. 16 is a schematic diagram of the structure of a separator provided in some other embodiments of the present application.
  • Icon 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box body; 20-battery monomer; 21-shell; 211-opening; 212-accommodation space; 213-reinforcement; 2131-first reinforcement; 2131a-first section; 2131b-second section; 2132-second reinforcement; 214-bottom wall; 215-side wall; 2151-first side wall; 2152-second side wall; 2 2-electrode assembly; 221-straight portion; 222-arc-shaped portion; 223-avoidance space; 23-end cover; 24-positive electrode terminal; 25-negative electrode terminal; 26-pressure relief mechanism; 27-insulating member; 28-separator; 281-accommodating groove; 282-first surface; 283-separator; 2831-accommodating gap; 30-end plate; 200-controller; 300-motor; X-first direction; Y-second direction; Z-third direction.
  • the terms “installed”, “connected”, “connected”, and “attached” should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
  • installed should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements.
  • a and/or B can represent: A exists alone, A and B exist at the same time, and B exists alone.
  • the character "/" in this application generally indicates that the associated objects before and after are in an "or" relationship.
  • battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this.
  • Battery cells may be cylindrical, flat, rectangular, or in other shapes, etc., and the embodiments of the present application do not limit this.
  • Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft-pack battery cells, and the embodiments of the present application do not limit this.
  • 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 the present application may include a battery module or a battery pack.
  • the battery generally includes a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.
  • a battery cell includes an electrode assembly and an electrolyte.
  • the electrode assembly consists of a positive electrode sheet, a negative electrode sheet and a separator.
  • a battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet.
  • the positive electrode sheet includes a positive electrode collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode collector, and the part of the positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode tab to realize the input or output of electric energy of the positive electrode sheet through the positive electrode tab.
  • the material of the positive electrode collector may be aluminum, and the positive electrode active material may be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.
  • the negative electrode sheet includes a negative electrode collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode collector, and the part of the negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode tab to realize the input or output of electric energy of the negative electrode sheet through the negative electrode tab.
  • the material of the negative electrode collector may be copper, and the negative electrode active material may be carbon or silicon, etc. In order to ensure that a large current can pass without melting, there are multiple positive electrode tabs stacked together, and there are multiple negative electrode tabs stacked together.
  • the material of the isolation film may be polypropylene (PP) or polyethylene (PE), etc.
  • the electrode assembly may be a winding structure or a stacked structure, but the embodiments of the present application are not limited thereto.
  • Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today.
  • the battery cell of the battery is assembled into an electrode assembly (bare cell) by winding or stacking the positive electrode sheet, the negative electrode sheet and the isolation membrane, which is then loaded into the shell, covered with the end cover, and finally injected with electrolyte.
  • the battery includes a box body and a plurality of battery cells contained in the box body.
  • the inventors have discovered that for general batteries, multiple battery cells are usually assembled into modules and then installed in the battery box. However, since the battery usage environment is relatively complex, vibration or shaking often occurs, which can easily cause the battery cells contained in the battery box to move, thereby causing the battery cells to collide with the box or other components, which is not conducive to the safe use of the battery.
  • the side surfaces of the battery cells are usually bonded to the end plates arranged in the box, and the bottom surfaces of the battery cells are bonded to the box, so as to secure the battery cells in the box, thereby reducing the risk of battery cells in the battery box moving during use and causing collisions.
  • the inward or outward bulging of the shell of the battery cell easily causes insufficient bonding area between the battery cell and the end plate or the case, resulting in insufficient bonding strength between the battery cell and the end plate or the case, which is not conducive to improving the production quality of the battery.
  • the battery cell includes a shell, an electrode assembly and an end cover.
  • the shell includes a plurality of wall portions, which enclose a receiving space with an opening, the electrode assembly is received in the receiving space, and the end cover covers the opening.
  • at least one wall portion has a reinforcing portion protruding on the surface facing the receiving space.
  • the shell has a plurality of wall portions, and the plurality of wall portions enclose a storage space for accommodating an electrode assembly.
  • a reinforcement portion on the surface of the wall portion facing the storage space, the structural strength of the wall portion of the shell can be effectively improved, so as to alleviate the deformation of the wall portion of the shell due to the internal and external pressure difference during the production, assembly or use of the battery cell, which is beneficial to reduce the inward or outward convexity of the outer surface of the shell, so as to ensure the flatness of the outer surface of the shell.
  • the battery cell when the battery cell is assembled into a battery, it can facilitate the bonding of the outer surface of the shell of the battery cell with other components, such as a box body, so as to reduce the phenomenon of insufficient glue or overflow of glue between the shell and other components, thereby effectively reducing the difficulty of battery assembly, which is beneficial to improving the production efficiency of the battery, and can effectively increase the bonding area between the shell and other components to ensure the bonding strength between the shell and other components, which is beneficial to improving the production quality of the battery.
  • it can alleviate the phenomenon of debonding of the shell and other components due to deformation of the shell during use of the battery cell, thereby helping to improve the stability and reliability of the battery cell.
  • the battery cell disclosed in the embodiment of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft.
  • a power supply system having the battery cell and battery disclosed in the present application can be used to form the electrical device, which is helpful to alleviate the phenomenon that the shell of the battery cell is deformed and sunken or convex during production, assembly or use, so as to improve the production efficiency and production quality of the battery.
  • the embodiment of the present application provides an electric device using a battery as a power source
  • the electric 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 car, a ship, a spacecraft, etc.
  • the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc.
  • the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.
  • FIG. 1 is a schematic diagram of the structure of a vehicle 1000 provided in 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.
  • a battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided 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 be used as an operating power source for the vehicle 1000.
  • the vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation and working power requirements of the vehicle 1000 during driving.
  • the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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 structure of the battery 100 provided in some embodiments of the present application.
  • the battery 100 includes a box body 10 and a battery cell 20, and the battery cell 20 is used to be accommodated in the box body 10.
  • the box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures.
  • the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20.
  • the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure.
  • the first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 jointly define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.
  • the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder, a cuboid, etc.
  • the battery 100 there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection.
  • a mixed connection means that the multiple battery cells 20 are both connected in series and in parallel.
  • the multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10.
  • the battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.
  • Each battery cell 20 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 20 may be cylindrical, flat, rectangular or other shapes. For example, in FIG2 , the battery cell 20 is a rectangular structure.
  • FIG. 3 is a schematic diagram of assembling a battery cell 20 and a box body 10 provided in some embodiments of the present application.
  • the battery 100 further includes a plurality of groups of end plates 30, each group of end plates 30 including two end plates 30 spaced apart in the thickness direction of the end plates 30, and the space between the two end plates 30 is used to accommodate the battery cell 20.
  • the two end plates 30 need to be respectively arranged on both sides of the battery cell 20 in the second direction Y (the length direction of the battery cell 20), and the two sides of the battery cell 20 in the second direction Y are respectively bonded to the two end plates 30, so as to stabilize the battery cell 20 in the box body 10.
  • the bottom of the battery cell 20 in the first direction X (the height direction of the battery cell 20) to the side of the second box body 12 of the box body 10 facing the first box body 11, so as to further stabilize the battery cell 20 in the box body 10, thereby reducing the risk of the battery cell 20 moving in the box body 10 during the use of the battery 100, which is beneficial to improving the stability of the battery 100.
  • Figure 4 is a structural explosion diagram of a battery cell 20 provided in some embodiments of the present application
  • Figure 5 is a structural schematic diagram of a shell 21 provided in some embodiments of the present application
  • Figure 6 is a cross-sectional view of the shell 21 provided in some embodiments of the present application in a direction perpendicular to the third direction Z.
  • the present application provides a battery cell 20, and the battery cell 20 includes a shell 21, an electrode assembly 22 and an end cover 23.
  • the shell 21 includes a plurality of wall portions, and the plurality of wall portions enclose a receiving space 212 having an opening 211.
  • the electrode assembly 22 is received in the receiving space 212, and the end cover 23 covers the opening 211.
  • a reinforcing portion 213 is convexly provided on the surface of at least one wall portion facing the receiving space 212.
  • the shell 21 includes a plurality of walls, which enclose a receiving space 212 having an opening 211 . That is, the shell 21 is a hollow structure having an opening 211 , and the interior of the shell 21 is used to receive the electrode assembly 22 .
  • the housing 21 may also be used to contain electrolytes, such as electrolytes.
  • the housing 21 may be in various structural forms.
  • the housing 21 may also be made of various materials, such as copper, iron, aluminum, steel, aluminum alloy, etc.
  • a accommodating space 212 is formed inside the shell 21, and the accommodating space 212 has an opening 211, that is, the shell 21 is a hollow structure with one end open, and the end cover 23 covers the opening 211 of the shell 21 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.
  • the housing 21 may include a bottom wall 214 and a plurality of side walls 215, that is, the plurality of wall portions of the housing 21 are the bottom wall 214 and the plurality of side walls 215.
  • the plurality of side walls 215 are arranged around the bottom wall 214, and one end of the plurality of side walls 215 in the first direction X is connected to the bottom wall 214, and the other end is enclosed to form an opening 211, and the bottom wall 214 and the plurality of side walls 215 jointly define a receiving space 212 for receiving the electrode assembly 22.
  • the first direction X is the thickness direction of the bottom wall 214, and is also the height direction of the battery cell 20.
  • At least one wall portion has a reinforcing portion 213 protruding from its surface facing the accommodating space 212, that is, the reinforcing portion 213 can be arranged on the surface of the bottom wall 214 facing the accommodating space 212, or on the surface of the side wall 215 facing the accommodating space 212, or both the surface of the bottom wall 214 facing the accommodating space 212 and the surface of the side wall 215 facing the accommodating space 212 can be provided with the reinforcing portion 213.
  • the electrode assembly 22 When assembling the battery cell 20 , the electrode assembly 22 may be placed in the housing 21 first, and the housing 21 may be filled with electrolyte, and then the end cap 23 may be closed on the opening 211 of the housing 21 .
  • the shell 21 can be in various shapes, such as a cylinder, a cuboid, etc.
  • the shape of the shell 21 can be determined according to the specific shape of the electrode assembly 22.
  • the shell 21 can be a cylindrical structure; if the electrode assembly 22 is a cuboid structure, the shell 21 can be a cuboid structure.
  • the end cap 23 can also be in various structures, such as a plate-like structure or a hollow structure with one end open.
  • the housing 21 is a rectangular parallelepiped structure
  • the end cover 23 is a plate-like structure
  • the end cover 23 covers the opening 211 of the housing 21.
  • the plurality of side walls 215 enclose a rectangular parallelepiped structure with two ends open in the first direction X
  • the plurality of side walls 215 may include two first side walls 2151 and two second side walls 2152, the two first side walls 2151 are arranged oppositely along the second direction Y, and the two second side walls 2152 are arranged oppositely along the third direction Z, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other, that is, the second direction Y is the thickness direction of the first side wall 2151, and is also the length direction of the battery cell 20, and similarly, the third direction Z is the thickness direction of the second side wall 2152, and is also the thickness direction of the battery cell 20, that is, when the plurality of battery cells 20 are assembled into the battery 100,
  • the electrode assembly 22 is a component in the battery cell 20 where an electrochemical reaction occurs.
  • the electrode assembly 22 may include a positive electrode sheet, a negative electrode sheet, and a separator.
  • the electrode assembly 22 may be a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet, or a stacked structure formed by stacking a positive electrode sheet, a separator, and a negative electrode sheet.
  • the electrode assembly 22 is a wound structure formed by winding a positive electrode sheet, a separator, and a negative electrode sheet.
  • the electrode assembly 22 contained in the housing 21 may be one or more.
  • the electrode assemblies 22 contained in the housing 21 may also be stacked in three, four, five or six layers.
  • the battery cell 20 may further include a positive electrode terminal 24, a negative electrode terminal 25, and a pressure relief mechanism 26, which are all mounted on the end cap 23.
  • the positive electrode terminal 24 and the negative electrode terminal 25 are both used to be electrically connected to the electrode assembly 22 to serve as the positive output electrode and the negative output electrode of the battery cell 20.
  • the pressure relief mechanism 26 is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.
  • the pressure relief mechanism 26 is located between the positive electrode terminal 24 and the negative electrode terminal 25.
  • the pressure relief mechanism 26 may be a component such as an explosion-proof valve, an explosion-proof disk, a gas valve, a pressure relief valve or a safety valve.
  • the battery cell 20 is not limited to the above structure, and the battery cell 20 may also be other structures.
  • the battery cell 20 includes a shell 21 and two end caps 23.
  • the shell 21 is a hollow structure with both ends opposite to each other in the first direction X open.
  • One end cap 23 is correspondingly covered at an opening 211 of the shell 21 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.
  • the shell 21 includes a plurality of side walls 215, and the plurality of side walls 215 are connected end to end to form a hollow structure with both ends open in the first direction X, that is, the plurality of wall portions of the shell 21 are the plurality of side walls 215.
  • the positive electrode terminal 24 and the negative electrode terminal 25 may be installed on the same end cap 23 or on different end caps 23; the pressure relief mechanism 26 may be installed on one end cap 23 or on both end caps 23.
  • the positive electrode terminal 24 and the negative electrode terminal 25 may also be arranged on the shell 21.
  • the battery cell 20 may further include an insulating member 27 , which is coated on the outside of the electrode assembly 22 to insulate and isolate the electrode assembly 22 from the shell 21 .
  • the insulating member 27 is an insulating film coated on the electrode assembly 22 , and the insulating member 27 may be made of plastic, rubber, silicone or the like.
  • the shell 21 has a plurality of walls, and the plurality of walls enclose a storage space 212 for accommodating the electrode assembly 22.
  • a reinforcing portion 213 on the surface of the wall facing the storage space 212, the structural strength of the wall of the shell 21 can be effectively improved to alleviate the deformation of the wall of the shell 21 due to the internal and external pressure difference during the production, assembly or use of the battery cell 20, which is beneficial to reduce the inward or outward convexity of the outer surface of the shell 21, so as to ensure the flatness of the outer surface of the shell 21.
  • the battery cell 20 when the battery cell 20 is assembled into the battery 100, it is convenient to align the outer surface of the shell 21 of the battery cell 20 with other The components are bonded to each other, such as the case 10, to reduce the phenomenon of insufficient glue or overflow of glue between the shell 21 and other components, thereby effectively reducing the difficulty of assembling the battery 100, which is beneficial to improving the production efficiency of the battery 100, and can effectively increase the bonding area between the shell 21 and other components to ensure the bonding strength between the shell 21 and other components, which is beneficial to improving the production quality of the battery 100.
  • it can alleviate the phenomenon of debonding of the shell 21 and other components due to deformation of the shell 21 during use of the battery cell 20, which is beneficial to improving the stability and reliability of the battery cell 20.
  • FIG. 7 is a partial enlarged view of the A portion of the housing 21 shown in FIG. 6.
  • the multiple wall portions include multiple side walls 215 connected end to end in sequence, and the multiple side walls 215 surround the outer side of the electrode assembly 22.
  • the reinforcement portion 213 includes a first reinforcement portion 2131, and at least one side wall 215 is provided with the first reinforcement portion 2131.
  • the housing 21 includes four side walls 215, which are two first side walls 2151 arranged opposite to each other along the second direction Y and two second side walls 2152 arranged opposite to each other along the third direction Z.
  • the four side walls 215 are enclosed to form a rectangular parallelepiped structure, and one end of the four side walls 215 in the first direction X is enclosed to form an opening 211, and the other end is connected to the bottom wall 214.
  • the housing 21 may also include three, five or six side walls 215, etc., so as to enclose a triangular columnar structure, a pentagonal columnar structure or a hexagonal columnar structure, etc.
  • At least one side wall 215 is provided with a first reinforcement portion 2131, that is, one side wall 215 among the multiple side walls 215 may be provided with the first reinforcement portion 2131, or multiple side walls 215 may be provided with the first reinforcement portion 2131.
  • first reinforcement portion 2131 may also be provided on the second side wall 2152, or the first reinforcement portion 2131 may also be provided on the first side wall 2151 and the second side wall 2152.
  • the multiple wall portions include multiple side walls 215 connected end to end in sequence, that is, the multiple side walls 215 are the parts of the shell 21 that surround the outside of the electrode assembly 22.
  • a first reinforcement portion 2131 on the side wall 215 it is beneficial to increase the structural strength of the side wall 215, thereby effectively reducing the risk of deformation of the side wall 215 during the production, assembly or use of the battery cell 20, so as to ensure the flatness of the outer surface of the side wall 215, and further ensure the bonding strength between the battery cell 20 and other components, and can alleviate the phenomenon of debonding between the battery cell 20 and other components due to deformation of the side wall 215 during use of the battery cell 20.
  • FIG. 8 is a cross-sectional view of the shell 21 provided in some embodiments of the present application in a direction perpendicular to the second direction Y, and the first reinforcement portion 2131 extends along the first direction X.
  • the first reinforcement portion 2131 extends along the first direction X, that is, the first reinforcement portion 2131 extends from the bottom wall 214 toward a direction close to the opening 211 .
  • one end of the first reinforcing portion 2131 close to the bottom wall 214 in the first direction X is connected to the bottom wall 214 .
  • the shell 21 adopting such a structure can effectively increase the reinforcement effect of the first reinforcement portion 2131 on the side wall 215 to ensure the structural strength of the side wall 215, thereby further reducing the deformation of the side wall 215.
  • a distance between an end of the first reinforcement portion 2131 close to the opening 211 and the opening 211 is L 1 , satisfying L 1 ⁇ 1.5 mm.
  • the distance between the end of the first reinforcement portion 2131 close to the opening 211 and the opening 211 is L 1 , that is, in the first direction X, there is a gap between the end of the first reinforcement portion 2131 close to the opening 211 and the opening 211 of the housing 21 , and the width of the gap is greater than 1.5 mm.
  • the distance between the end of the first reinforcing portion 2131 close to the opening 211 and the opening 211 may be 1.5 mm, 2 mm, 3 mm, 4 mm, 5 mm, etc.
  • the shell 21 with such a structure can reduce the interference effect of the first reinforcement portion 2131 on the end cover 23 when the end cover 23 is covered on the opening 211 of the shell 21 and assembled with the shell 21, thereby facilitating improving the assembly quality between the end cover 23 and the shell 21.
  • the distance between the end of the first reinforcement portion 2131 close to the opening 211 and the opening 211 is L 1
  • the height of the side wall 215 is L 2 , satisfying L 1 ⁇ 0.5 ⁇ L 2 .
  • One end of the first reinforcement portion 2131 close to the bottom wall 214 in the first direction X is connected to the bottom wall 214 , L 1 ⁇ 0.5 ⁇ L 2 , that is, the length of the first reinforcement portion 2131 in the first direction X is greater than or equal to half the length of the side wall 215 in the first direction X.
  • the distance between the end of the first reinforcement portion 2131 close to the opening 211 in the first direction X and the opening 211 is less than or equal to half of the height of the side wall 215 in the first direction X, that is, the reinforcement area of the side wall 215 by the first reinforcement portion 2131 in the first direction X is greater than or equal to half of the side wall 215, it is possible to effectively ensure that the side wall 215 has a sufficient area to be reinforced by the first reinforcement portion 2131, which is beneficial to further improve the structural strength of the side wall 215.
  • the plurality of wall portions further include a bottom wall 214, and the plurality of side walls 215 are disposed around the bottom wall 214.
  • the first reinforcing portion 2131 includes a first section 2131a.
  • the first section 2131a extends from one end of the first reinforcing portion 2131 close to the opening 211 toward a direction close to the bottom wall 214, and the thickness of the side wall 215 in the thickness direction gradually increases.
  • the first section 2131a extends from one end of the first reinforcement portion 2131 close to the opening 211 toward the direction close to the bottom wall 214, and the thickness in the thickness direction of the side wall 215 gradually increases. That is to say, the thickness of the first reinforcement portion 2131 close to the opening 211 in the first direction X gradually decreases in the direction of the opening 211, that is, the first reinforcement portion 2131 close to the opening 211 in the first direction X forms a guiding slope.
  • the first reinforcement portion 2131 has a first section 2131a extending from one end of the first reinforcement portion 2131 close to the opening 211 toward the bottom wall 214 in the first direction X, and the thickness of the first section 2131a gradually increases, that is, the first reinforcement portion 2131 forms an inclined surface in the area close to the opening 211 in the first direction X.
  • This structure can, on the one hand, guide the electrode assembly 22 to a certain extent when the electrode assembly 22 is assembled into the shell 21, which is beneficial to reducing the difficulty of assembling the electrode assembly 22 and the shell 21.
  • the electrode assembly 22 when the electrode assembly 22 is assembled into the shell 21, it can reduce the phenomenon of the first reinforcement portion 2131 scratching the electrode assembly 22, thereby reducing the risk of damage to the electrode assembly 22, which is beneficial to improving the production quality of the battery cell 20.
  • the first reinforcing portion 2131 further includes a second section 2131b.
  • the second section 2131b is connected to the first section 2131a, and along the first direction X, the second section 2131b extends from an end of the first section 2131a away from the opening 211 toward a direction close to the bottom wall 214, and the thickness in the thickness direction of the side wall 215 remains unchanged.
  • the first reinforcement portion 2131 has two parts, one part is the second section 2131b with constant thickness, and the other part is the first section 2131a with thickness gradually decreasing toward the opening 211 in the first direction X, and the first section 2131a and the second section 2131b are connected to each other.
  • the first reinforcement portion 2131 is provided with two parts, namely a first section 2131a and a second section 2131b arranged along the first direction X.
  • the first section 2131a is closer to the opening 211 than the second section 2131b, and the first section 2131a is a structure in which the thickness gradually increases from one end close to the opening 211 to the first end connected to the second section 2131b, and the second section 2131b is a structure in which the thickness remains unchanged.
  • the first reinforcement portion 2131 with such a structure can guide the electrode assembly 22 when the electrode assembly 22 is assembled into the shell 21 while ensuring the structural strength of the first reinforcement portion 2131 itself.
  • Figure 9 is a schematic diagram of the structure of the housing 21 provided in some other embodiments of the present application
  • Figure 10 is a cross-sectional view of the housing 21 provided in some other embodiments of the present application in a direction perpendicular to the third direction Z
  • Figure 11 is a partial enlarged view of the B portion of the housing 21 shown in Figure 10.
  • the first section 2131a is the first reinforcement portion 2131.
  • the first section 2131a is the first reinforcement part 2131, that is, the first reinforcement part 2131 as a whole is a structure in which the thickness gradually increases from one end close to the opening 211 to the end close to the bottom wall 214 in the first direction X, that is, the first reinforcement part 2131 is formed with a guiding slope extending from one end of the first reinforcement part 2131 to the other end of the first reinforcement part 2131.
  • the first section 2131a is the first reinforcement portion 2131, that is, the thickness of the first reinforcement portion 2131 gradually increases from the end close to the opening 211 to the end close to the bottom wall 214 in the first direction X.
  • the first reinforcement portion 2131 with this structure can better guide the electrode assembly 22 when the electrode assembly 22 is assembled into the shell 21.
  • the plurality of side walls 215 include two first side walls 2151 and two second side walls 2152, the two first side walls 2151 are arranged opposite to each other along the second direction Y, the two second side walls 2152 are arranged opposite to each other along the third direction Z, one first side wall 2151, one second side wall 2152, another first side wall 2151 and another second side wall 2152 are connected end to end in sequence, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.
  • the area of the surface of the second side wall 2152 facing the accommodation space 212 is greater than the area of the surface of the first side wall 2151 facing the accommodation space 212, and at least one first side wall 2151 is provided with a first reinforcement portion 2131.
  • the side walls 215 include two first side walls 2151 arranged opposite to each other along the second direction Y and two second side walls 2152 arranged opposite to each other along the third direction Z. That is, the side walls 215 enclose a hollow rectangular structure with open ends in the first direction X.
  • the area of the surface of the second side wall 2152 facing the accommodating space 212 is larger than the area of the surface of the first side wall 2151 facing the accommodating space 212, that is, the inner surface of the second side wall 2152 is the surface with the largest area among the inner surfaces of the shell 21, that is, the two second side walls 2152 are the two side walls 215 of the shell 21 of the battery cell 20 in its thickness direction.
  • the multiple side walls 215 of the shell 21 are respectively two first side walls 2151 arranged opposite to each other along the second direction Y and two second side walls 2152 arranged opposite to each other along the third direction Z, and the area of the inner surface of the first side wall 2151 is smaller than the area of the inner surface of the second side wall 2152. Since the battery cell 20 will bond the first side wall 2151 to other components when assembled into the box 10 of the battery 100, the first reinforcing portion 2131 is set on the first side wall 2151. The structural strength of the first side wall 2151 can be increased to reduce the deformation of the first side wall 2151, thereby ensuring the flatness of the first side wall 2151 and improving the bonding quality between the first side wall 2151 and other components.
  • FIG. 12 is a partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application.
  • the battery cell 20 includes a plurality of electrode assemblies 22, and the plurality of electrode assemblies 22 are stacked along a third direction Z.
  • the electrode assembly 22 includes a straight portion 221 and an arcuate portion 222 connected to one end of the straight portion 221 along a second direction Y.
  • an escape space 223 is formed between the arcuate portions 222 of two adjacent electrode assemblies 22, and the first reinforcing portion 2131 is arranged opposite to the escape space 223 along the second direction Y.
  • the electrode assembly 22 includes a straight portion 221 and an arc portion 222 connected to one end of the straight portion 221 along the second direction Y, that is, both ends of the electrode assembly 22 in the second direction Y are arc transition areas, so that the electrode assembly 22 is an ellipse-like structure.
  • an avoidance space 223 is formed between the arc-shaped portions 222 of two adjacent electrode assemblies 22, that is, in the third direction Z, the arc-shaped portions 222 of two adjacent electrode assemblies 22 do not contact each other, thereby forming a gap, and the gap is the avoidance space 223 arranged relative to the first reinforcement portion 2131 in the second direction Y.
  • the electrode assemblies 22 disposed in the housing 21 may be two, three, four or five, etc., and correspondingly, the number of the first reinforcing parts 2131 disposed on the first side wall 2151 may be one or more.
  • the number of the electrode assemblies 22 is two, and the number of the first reinforcing parts 2131 is one.
  • the multiple electrode assemblies 22 located in the accommodating space 212 are stacked along the third direction Z, and the electrode assembly 22 includes a straight portion 221 and an arc portion 222, so that an avoidance space 223 can be formed between the arc portions 222 of two stacked and adjacent electrode assemblies 22.
  • the avoidance space 223 can avoid the first reinforcement portion 2131.
  • the battery cell 20 adopting this structure can achieve the mutual avoidance of the first reinforcement portion 2131 and the arc portion 222 of the electrode assembly 22, so as to reduce the risk of collision or scratching between the electrode assembly 22 and the first reinforcement portion 2131, which is beneficial to improving the assembly quality of the battery cell 20.
  • the width of the first reinforcing portion 2131 is D 1
  • the thickness of the straight portion 221 is D 2 , satisfying D 1 ⁇ D 2 .
  • the width of the first reinforcement portion 2131 is D 1 , that is, the maximum dimension of the first reinforcement portion 2131 in the third direction Z is D 1
  • the thickness of the straight portion 221 is D 2 , that is, the maximum dimension of the electrode assembly 22 in the third direction Z is D 2 .
  • the center position of the first reinforcing portion 2131 in the third direction Z is arranged corresponding to the abutting surface between two adjacent electrode assemblies 22 .
  • both ends of the first reinforcement portion 2131 do not exceed the farthest ends of the two adjacent electrode assemblies 22 in the second direction Y, so that the first reinforcement portion 2131 can be located as a whole in the avoidance space 223, thereby further reducing the risk of collision or scratching between the electrode assembly 22 and the first reinforcement portion 2131.
  • FIG. 13 is a partial cross-sectional view of a battery cell 20 provided in some other embodiments of the present application.
  • a plurality of first reinforcing portions 2131 are provided on the surface of the first side wall 2151 facing the accommodation space 212, and the plurality of first reinforcing portions 2131 are arranged at intervals along the third direction Z, and a first reinforcing portion 2131 is correspondingly provided for each avoidance space 223.
  • a first reinforcement portion 2131 is correspondingly disposed in each avoidance space 223 , that is, a first reinforcement portion 2131 is correspondingly disposed in the second direction Y in the avoidance space 223 formed between each two adjacent electrode assemblies 22 .
  • FIG. 13 there are three electrode assemblies 22 disposed in the housing 21, and the three electrode assemblies 22 are stacked along the third direction Z, and an escape space 223 is formed between the arc-shaped portions 222 of each two adjacent electrode assemblies 22, and two first reinforcing portions 2131 are disposed on the first side wall 2151, and each first reinforcing portion 2131 is disposed corresponding to an escape space 223.
  • the number of electrode assemblies 22 may also be four, five, six, or seven, etc.
  • first reinforcing portions 2131 spaced apart along the third direction Z on the first side wall 2151, and each reinforcing portion 213 corresponding to an avoidance space 223, it is beneficial to further enhance the structural strength of the first side wall 2151 while reducing the collision or scratch between the electrode assembly 22 and the first reinforcing portion 2131, thereby alleviating the deformation of the first side wall 2151 during the production, assembly or use of the battery cell 20.
  • FIG. 14 is a partial enlarged view of the C portion of the housing 21 shown in FIG. 8.
  • the plurality of wall portions include a bottom wall 214 and a plurality of side walls 215.
  • the plurality of side walls 215 are arranged around the bottom wall 214, and the bottom wall 214 and the plurality of side walls 215 jointly define a receiving space 212.
  • the opening 211 is arranged opposite to the bottom wall 214.
  • the reinforcing portion 213 includes a second reinforcing portion 2132, and the second reinforcing portion 2132 is arranged on the bottom wall 214.
  • the second reinforcing portion 2132 extends along the second direction Y, and one end of the second reinforcing portion 2132 in the second direction Y is connected to the first reinforcing portion 2131 .
  • the multiple wall portions include a bottom wall 214 and multiple side walls 215 arranged around the bottom wall 214, that is, the shell 21 is surrounded by the bottom wall 214 and the multiple side walls 215 arranged around the bottom wall 214.
  • a reinforcement portion 213 on the bottom wall 214 it is beneficial to increase the structural strength of the bottom wall 214, thereby effectively reducing the risk of deformation of the bottom wall 214 during the production, assembly or use of the battery cell 20, so as to ensure the flatness of the outer surface of the bottom wall 214, thereby ensuring the bonding strength between the battery cell 20 and other components, and alleviating the phenomenon of debonding between the battery cell 20 and other components due to deformation of the bottom wall 214 during use of the battery cell 20.
  • the battery cell 20 further includes a separator 28 .
  • the separator 28 is disposed between the bottom wall 214 and the electrode assembly 22 along the first direction X to separate the bottom wall 214 and the electrode assembly 22 .
  • the separator 28 serves to separate the bottom wall 214 and the electrode assembly 22 in the first direction X, so as to achieve insulation isolation between the bottom wall 214 and the electrode assembly 22.
  • the material and structure of the separator 28 can be various, and exemplarily, the material of the separator is an insulating material, such as plastic, rubber or silicone.
  • the separator 28 can separate the bottom wall 214 from the electrode assembly 22 , thereby reducing the short circuit between the electrode assembly 22 and the bottom wall 214 , thereby facilitating improving the safety of the battery cell 20 .
  • FIG. 15 is a cross-sectional view of a separator 28 provided in some embodiments of the present application.
  • a surface of the separator 28 facing the bottom wall 214 is provided with a receiving groove 281, and at least a portion of the second reinforcement portion 2132 is received in the receiving groove 281.
  • the partition 28 has a first surface 282 facing the bottom wall 214 in the first direction X, and the receiving groove 281 is disposed on the first surface 282 .
  • the second reinforcing portion 2132 is accommodated in the accommodating groove 281 , that is, the second reinforcing portion 2132 may be entirely accommodated in the accommodating groove 281 in the first direction X, or may be partially accommodated in the accommodating groove 281 in the first direction X.
  • the separator 28 is provided with a receiving groove 281 for accommodating at least part of the second reinforcement portion 2132 on the surface facing the bottom wall 214 in the first direction X.
  • the separator 28 with such a structure can effectively reduce the space occupied by the second reinforcement portion 2132 and the separator 28 in the first direction X, thereby facilitating optimizing the size of the battery cell 20 in the first direction X to improve the energy density of the battery cell 20.
  • a depth of the receiving groove 281 is greater than or equal to a thickness of the second reinforcing portion 2132 .
  • the groove depth of the accommodating groove 281 in the first direction X is greater than or equal to the thickness of the second reinforcement portion 2132, that is, the second reinforcement portion 2132 can be accommodated as a whole in the accommodating groove 281 in the first direction X, it is beneficial to further reduce the space occupied by the second reinforcement portion 2132 and the separator 28 in the first direction X, so as to optimize the size of the battery cell 20 in the first direction X.
  • FIG. 6 is a schematic diagram of the structure of the separator 28 provided in other embodiments of the present application.
  • the second reinforcement portion 2132 extends along the second direction Y
  • the separator 28 includes two separators 283, along the third direction Z
  • the two separators 283 are respectively arranged on both sides of the second reinforcement portion 2132, and the first direction X, the second direction Y and the third direction Z are perpendicular to each other.
  • the two separators 283 are respectively arranged on both sides of the second reinforcement portion 2132 , that is, the two separators 283 jointly define an accommodating gap 2831 for accommodating at least part of the second reinforcement portion 2132 .
  • the separator 28 is provided with two separators 283, and the two separators 283 are respectively arranged on both sides of the reinforcement part 213 in the third direction Z, so that the second reinforcement part 2132 is accommodated between the two separators 283, so that the two separators 283 can cooperate to separate the electrode assembly 22 and the bottom wall 214.
  • the separator 28 with such a structure effectively reduces the space occupied by the second reinforcement part 2132 and the separator 28 in the first direction X, which is beneficial to optimize the size of the battery cell 20 in the first direction X, so as to improve the energy density of the battery cell 20.
  • the thickness of the separator 283 is greater than or equal to the thickness of the second reinforcing part 2132 .
  • the thickness of the separator 283 in the first direction X is greater than or equal to the thickness of the second reinforcement portion 2132, that is, the second reinforcement portion 2132 can be accommodated as a whole in the gap formed between the two separators 283 in the first direction X, it is beneficial to further reduce the space occupied by the second reinforcement portion 2132 and the separator 28 in the first direction X, so as to optimize the size of the battery cell 20 in the first direction X.
  • the present application also provides a battery 100, comprising a battery cell 20 of any of the above solutions.
  • the battery 100 may further include a box body 10 , in which the battery cells 20 are accommodated.
  • the present application further provides an electrical device, comprising a battery 100 according to any of the above schemes, and the battery 100 is used to provide electrical energy to the electrical device.
  • the power-consuming device may be any of the aforementioned devices or systems using the battery 100 .
  • the present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, an end cap 23, and a separator 28.
  • the housing 21 includes a bottom wall 214 and a plurality of side walls 215, the plurality of side walls 215 are arranged around the bottom wall 214, the bottom wall 214 and the plurality of side walls 215 jointly define a receiving space 212, along a first direction X, one end of the plurality of side walls 215 is connected to the bottom wall 214, and the other end is enclosed to form an opening 211, the plurality of side walls 215 include two first side walls 2151 arranged oppositely along a second direction Y and two second side walls 2152 arranged oppositely along a third direction Z, the surface area of the second side wall 2152 facing the receiving space 212 is greater than the surface area of the first side wall 2151 facing the receiving space 212.
  • a first reinforcing portion 2131 is convexly provided on the surfaces of the two first side walls 2151 facing the accommodation space 212, and a second reinforcing portion 2132 is convexly provided on the surface of the bottom wall 214 facing the accommodation space 212.
  • the first reinforcing portion 2131 extends along the first direction X, and one end of the first reinforcing portion 2131 is connected to the bottom wall 214 along the first direction X, and the distance between one end of the first reinforcing portion 2131 close to the opening 211 and the opening 211 is greater than or equal to 1.5 mm, and the length of the first reinforcing portion 2131 in the first direction X is greater than or equal to half of the first side wall 2151.
  • the first reinforcement portion 2131 includes a first section 2131a and a second section 2131b arranged along the first direction X.
  • the first section 2131a extends from one end of the first reinforcement portion 2131 close to the opening 211 toward the bottom wall 214, and the thickness in the thickness direction of the side wall 215 gradually increases.
  • the second section 2131b is connected to the first section 2131a.
  • the second section 2131b extends from one end of the first section 2131a away from the opening 211 toward the bottom wall 214, and the thickness in the thickness direction of the side wall 215 remains unchanged.
  • the electrode assembly 22 is accommodated in the accommodation space 212 and there are multiple electrode assemblies 22, which are stacked along the third direction Z.
  • the electrode assembly 22 includes a straight portion 221 and an arc portion 222 connected to one end of the straight portion 221 along the second direction Y.
  • an escape space 223 is formed between the arc portions 222 of two adjacent electrode assemblies 22, and the first reinforcement portion 2131 is arranged opposite to the escape space 223 along the second direction Y.
  • the separator 28 is arranged between the bottom wall 214 and the electrode assembly 22 along the first direction X to separate the bottom wall 214 and the electrode assembly 22.
  • the surface of the separator 28 facing the bottom wall 214 is provided with an accommodation groove 281, and the second reinforcement portion 2132 is accommodated in the accommodation groove 281 as a whole.

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  • Sealing Battery Cases Or Jackets (AREA)

Abstract

L'invention concerne un élément de batterie (20), une batterie (100) et un appareil électrique, appartenant au domaine technique des batteries. L'élément de batterie (20) comprend un boîtier (21), un ensemble électrode (22) et un couvercle d'extrémité (23). Le boîtier (21) comprend de multiples parties de paroi, les parties de paroi entourant un espace de réception (212) ayant une ouverture (211). L'ensemble électrode (22) est logé dans l'espace de réception (212), l'ouverture (211) est recouverte par le couvercle d'extrémité (23), et une partie de renforcement (213) est disposée en saillie sur la surface d'au moins une partie de paroi faisant face à l'espace de réception (212). Au moyen de la fourniture de la partie de renforcement (213) sur la surface d'une partie de paroi qui fait face à l'espace de réception (212), la résistance structurale de la partie de paroi peut être augmentée, de façon à améliorer le phénomène d'une déformation de partie de paroi due à un différentiel de pression interne et externe ; ceci aide à réduire une situation dans laquelle la surface externe du boîtier (21) est enfoncée ou fait saillie, ce qui permet d'assurer la planéité de la surface externe du boîtier (21). Lorsque l'élément de batterie (20) est assemblé dans la batterie (100), la surface externe du boîtier (21) de l'élément de batterie (20) peut être facilement liée à d'autres composants, ce qui peut réduire efficacement la difficulté d'assemblage de la batterie (100). En outre, une zone de liaison entre le boîtier (21) et d'autres composants peut être efficacement augmentée, ce qui permet d'assurer la force de liaison entre le boîtier (21) et d'autres composants.
PCT/CN2022/121846 2022-09-27 2022-09-27 Élément de batterie, batterie et appareil électrique WO2024065205A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202280086537.7A CN118511367A (zh) 2022-09-27 2022-09-27 电池单体、电池及用电装置
PCT/CN2022/121846 WO2024065205A1 (fr) 2022-09-27 2022-09-27 Élément de batterie, batterie et appareil électrique

Applications Claiming Priority (1)

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PCT/CN2022/121846 WO2024065205A1 (fr) 2022-09-27 2022-09-27 Élément de batterie, batterie et appareil électrique

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WO2024065205A1 true WO2024065205A1 (fr) 2024-04-04

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204189832U (zh) * 2014-09-25 2015-03-04 武汉瀚兴日月电源有限公司 用于一次锂电池的包装外壳
JP2020057471A (ja) * 2018-09-28 2020-04-09 古河電池株式会社 鉛蓄電池
CN215451681U (zh) * 2021-06-02 2022-01-07 河南新太行电源股份有限公司 一种高强度大容量电池壳结构
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
CN217158363U (zh) * 2022-04-08 2022-08-09 宁德时代新能源科技股份有限公司 电池单体、电池以及用电装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204189832U (zh) * 2014-09-25 2015-03-04 武汉瀚兴日月电源有限公司 用于一次锂电池的包装外壳
JP2020057471A (ja) * 2018-09-28 2020-04-09 古河電池株式会社 鉛蓄電池
CN215451681U (zh) * 2021-06-02 2022-01-07 河南新太行电源股份有限公司 一种高强度大容量电池壳结构
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
CN217158363U (zh) * 2022-04-08 2022-08-09 宁德时代新能源科技股份有限公司 电池单体、电池以及用电装置

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