WO2024066169A1 - 电池单体、电池以及用电装置 - Google Patents

电池单体、电池以及用电装置 Download PDF

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Publication number
WO2024066169A1
WO2024066169A1 PCT/CN2023/076799 CN2023076799W WO2024066169A1 WO 2024066169 A1 WO2024066169 A1 WO 2024066169A1 CN 2023076799 W CN2023076799 W CN 2023076799W WO 2024066169 A1 WO2024066169 A1 WO 2024066169A1
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WO
WIPO (PCT)
Prior art keywords
sub
wall
battery cell
hole
protrusion
Prior art date
Application number
PCT/CN2023/076799
Other languages
English (en)
French (fr)
Inventor
柯海波
李全坤
毛国安
黄守君
梅祥
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.)
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Publication of WO2024066169A1 publication Critical patent/WO2024066169A1/zh

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Classifications

    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • 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
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
    • 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
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • 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
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/543—Terminals
    • 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
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • 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.
  • Batteries are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.
  • Battery cells can include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.
  • the present application provides a battery cell, a battery, and an electrical device, which can improve the safety performance of the battery cell.
  • the shell has a first wall and a receiving cavity, the first wall has a first through hole connecting the receiving cavity and the outside of the shell;
  • the electrode terminal has a seat body and a connecting portion connected to the seat body, the seat body is located behind the first wall Towards one side of the accommodating cavity, at least part of the connecting portion is located in the first through hole;
  • the current collecting member includes a main body and a convex portion connected to the main body, the convex portion protrudes toward the first wall, and the convex portion is used to connect the connecting portion.
  • the battery cell provided in the embodiment of the present application helps to reduce the protruding height of the convex portion of the current collector relative to the main body portion by arranging at least a portion of the connecting portion of the electrode terminal to be located in the first through hole, thereby helping to improve the structural strength of the convex portion and the connection reliability between the convex portion and the electrode terminal. Therefore, the battery cell provided in the embodiment of the present application helps to improve the safety performance of the battery cell.
  • the current collector has a groove on one side facing away from the first wall, and the groove and the convex portion are arranged correspondingly along the thickness direction of the first wall.
  • the convex portion can be formed by a stamping process, which is conducive to simplifying the processing technology of the current collector, and in an embodiment in which the convex portion is welded to the connecting portion, it is also conducive to improving the convenience of the welding process between the convex portion and the connecting portion.
  • the minimum wall thickness of the protrusion is ⁇ 1
  • the wall thickness of the main body is ⁇
  • 0.8 ⁇ 1/ ⁇ 1 This is conducive to ensuring the structural strength of the protrusion, thereby improving the connection strength and connection reliability between the protrusion and the connecting part.
  • the height h of the protrusion protruding from the main body satisfies: 0 ⁇ h ⁇ 3mm.
  • Such a configuration is conducive to ensuring that the ratio of the wall thickness ⁇ 1 of the protrusion to the thickness ⁇ of the main body satisfies: 0.8 ⁇ 1/ ⁇ 1, that is, it is conducive to ensuring that the ratio of the thickness of the protrusion before stretching to the thickness after stretching is greater than or equal to 0.8, which is conducive to ensuring the structural strength of the protrusion, thereby improving the connection strength and connection reliability between the protrusion and the connecting part.
  • the battery cell further includes an insulating member, which is disposed on the side of the first wall facing the accommodating cavity, and the insulating member has a second through hole, and the second through hole is disposed opposite to the first through hole along the thickness direction of the first wall;
  • the connecting portion has a first connecting surface facing the accommodating cavity, and the convex portion has a second connecting surface, the first connecting surface abuts against the second connecting surface, the first connecting surface and the second connecting surface are located in the first through hole, and/or the first connecting surface and the second connecting surface are located in the second through hole.
  • the convex portion is located in the second through hole, and the second through hole can provide a certain limiting effect for the convex portion.
  • the first through hole and the second through hole jointly provide a limiting effect for the convex portion, limiting the displacement of the convex portion relative to the insulating member and the first wall in the direction perpendicular to the thickness, especially in the embodiment where the convex portion is welded to the connecting portion, it is more convenient to connect the convex portion to the connecting portion.
  • the size of the first connection surface is larger than the size of the second connection surface. In this way, the connection between the protrusion and the connection portion is facilitated.
  • the connection portion can provide a good support effect for the protrusion, which facilitates the smooth progress of the welding process.
  • setting the first connection surface larger than the second connection surface is conducive to increasing the connection area of the first connection surface and the second connection surface, thereby improving the current-passing capacity of the current collector and the electrode terminal.
  • the battery cell further includes a seal, which is disposed around the connection portion, and along the thickness direction of the first wall, the seal is at least partially in contact between the seat body and the first wall. Providing the seal is beneficial to improving the sealing performance of the battery cell housing cavity, reducing the risk of electrolyte leakage affecting the normal operation of the battery cell, and further improving the safety performance of the battery cell.
  • the seat body has an abutting surface abutting against the sealing member, the distance from the abutting surface to the first connecting surface is s1, the distance from the abutting surface to the side of the insulating member facing the accommodating cavity is s, and s1/s ⁇ 0.7. In this way, it is helpful to ensure that the size of the protrusion extending into the first through hole or the second through hole is sufficient to position the protrusion, and further improve the stability and convenience of the connection between the protrusion and the connecting part.
  • the peripheral side surface of the connection portion and the surface of the base body facing the first wall are connected by an arc surface. In this way, during the stamping process of the connection portion, the risk of metal wires being generated at the intersection of the peripheral side surface of the connection portion and the surface of the base body facing the first wall is reduced, thereby facilitating the improvement of the finished product yield of the electrode terminal.
  • the radius of curvature R of the arcuate surface satisfies: R ⁇ 0.5 mm.
  • the arc surface will not press against the seal, and the seal and the abutment surface are in plane contact, with the force direction consistent, thereby reducing the risk of interference and warping between the seal and the arc, resulting in too small an effective sealing area, and thus causing sealing failure.
  • the connecting portion includes a first sub-portion and a second sub-portion connected to each other,
  • the second sub-part is located on the side of the first sub-part facing the accommodating cavity, the first sub-part is connected to the seat body, and the second sub-part is connected to the convex part.
  • the material of the first sub-part includes aluminum, which is beneficial to reducing the quality and production cost of the electrode terminal, and the material of the base body may include aluminum, and the first sub-part and the base body may be integrally formed to reduce the difficulty of processing.
  • the material of the second sub-part includes copper
  • the material of the current collector includes copper. This is beneficial to improving the connection strength of the second sub-part, the current collector and the tab, especially in the process of welding connection, which is beneficial to improving the welding strength of the tab, the current collector and the second sub-part.
  • the material of the first sub-part can be aluminum, and it is not necessary to set the material of the connection part to be copper, so as to reduce the amount of copper, thereby reducing the weight and production cost of the electrode terminal.
  • the dimension b of the second sub-portion along the thickness direction of the first wall satisfies: b ⁇ 0.8 mm. This is beneficial to improving the reliability of the welding connection between the second sub-portion and the protrusion, that is, it is beneficial to improving the connection strength between the connecting portion and the protrusion.
  • the second sub-section is disposed on the peripheral side of the first sub-section and on the side of the first sub-section facing the convex portion;
  • the seat body includes a third sub-section and a fourth sub-section connected to each other, the fourth sub-section surrounds the second sub-section and is disposed on the side of the third sub-section facing the first wall, and the sealing member abuts between the first wall and the fourth sub-section;
  • the fourth sub-section is connected to the peripheral side surface of the second sub-section.
  • the interface between the second sub-section and the first sub-section is not exposed to the electrolyte, so it is not easy to cause corrosion to the interface between the second sub-section and the first sub-section.
  • the interface between the fourth sub-section and the third sub-section is located on the side of the sealing interface between the sealing member and the seat body away from the electrolyte, and is not easy to contact the electrolyte, so it is not easy to corrode at the interface between the third sub-section and the fourth sub-section, further improving the stability of the electrode terminal structure.
  • the second sub-section and the fourth sub-section are integrally formed.
  • the composite interface of the second sub-section and the fourth sub-section with the first sub-section and the third sub-section is located on the side of the sealing interface of the seal away from the electrolyte, that is, located on the outside of the seal.
  • the composite interface of the material used in the second sub-section and the fourth sub-section and the first sub-section and the third sub-section is isolated from the electrolyte by the seal, and corrosion is not easy to occur at the composite interface, which is conducive to further improving the structural stability of the electrode terminal.
  • the first sub-section and the third sub-section are integrally formed.
  • the third sub-part can be formed by a stamping process using the same material, thereby simplifying the structural complexity of the electrode terminal and improving the processing efficiency of the electrode terminal.
  • the end surface of the fourth sub-section is located on the side of the peripheral surface of the seal member facing away from the connecting portion. In this way, the end surface of the fourth sub-section is located outside the sealing interface of the seal member, further reducing the possibility of the composite interface being corroded by the electrolyte.
  • an embodiment of the present application provides a battery, comprising a battery cell as in any embodiment of the first aspect.
  • the battery provided according to the embodiment of the present application has the same technical effect as the battery cell provided by any of the above embodiments, which will not be described in detail here.
  • an embodiment of the present application provides an electrical device, including a battery as in the embodiment of the second aspect, and the battery is used to provide electrical energy.
  • the electric device provided in the embodiment of the present application has the same technical effect as the battery provided in the embodiment of the present application, and thus will not be described in detail here.
  • FIG1 is a schematic structural diagram of a vehicle provided in one embodiment of the present application.
  • FIG2 is an exploded schematic diagram of a battery provided in an embodiment of the present application.
  • FIG3 is a schematic diagram of the structure of a battery module in a battery provided in an embodiment of the present application.
  • FIG4 is an exploded schematic diagram of a battery cell provided in some embodiments of the present application.
  • FIG5 is a front view of a battery cell provided by an embodiment of the present application with some structures omitted;
  • Fig. 6 is a schematic cross-sectional view of the structure along line A-A of Fig. 5;
  • FIG7 is a partial enlarged view of point B in FIG6;
  • FIG8 is another partial enlarged view of point B in FIG6;
  • FIG9 is another partial enlarged view of point B in FIG6 ;
  • FIG10 is another partial enlarged view of point B in FIG6 ;
  • FIG11 is another partial enlarged view of point B in FIG6 ;
  • battery cells may include lithium-ion secondary battery cells, lithium-ion primary battery cells, lithium-sulfur battery cells, sodium-lithium-ion battery cells, sodium-ion battery cells or magnesium-ion battery cells, etc., and the embodiments of the present application do not limit this.
  • Battery cells may be cylindrical, flat, rectangular or 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. 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, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator.
  • a battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work.
  • the positive electrode sheet includes a positive current collector and a positive active material layer, and the positive active material layer is coated on the surface of the positive current collector;
  • the positive current collector includes a positive current collector and a positive convex portion protruding from the positive current collector, the positive current collector is coated with the positive active material layer, at least part of the positive convex portion is not coated with the positive active material layer, and the positive convex portion serves as a positive electrode ear.
  • the material of the positive current collector can be aluminum
  • the positive active material layer includes a positive active material
  • the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode current collector portion and a negative electrode protrusion protruding from the negative electrode current collector portion, wherein the negative electrode current collector portion is coated with the negative electrode active material layer, and at least a portion of the negative electrode protrusion portion is not coated with the negative electrode active material layer, and the negative electrode protrusion portion is As the negative electrode tab.
  • the material of the negative electrode current collector may be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material may be carbon or silicon, etc.
  • the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together.
  • the material of the separator may be PP (polypropylene) or PE (polyethylene), etc.
  • the electrode assembly may be a winding structure or a laminated structure, and the embodiments of the present application are not limited to this.
  • the inventor discovered the problem of low safety performance of the battery cell, he conducted a systematic analysis and research on the structure and working process of the battery cell. As a result, it was found that in the battery cell, there is a shell between the electrode terminal and the current collector.
  • the current collector is provided with a convex portion, which extends toward the electrode terminal and is connected to the electrode terminal, thereby achieving the electrical connection between the electrode terminal and the current collector.
  • the height of the convex portion relative to the main body is too high, resulting in a low structural strength of the convex portion, and a low connection strength between the electrode terminal and the current collector, which is easy to cause the electrical connection between the electrode terminal and the current collector to fail, thus seriously affecting the working reliability and safety performance of the battery cell.
  • the inventors have improved the structure of the battery cell.
  • the technical solutions described in the embodiments of the present application are applicable to the battery cell, the battery including the battery cell, and the electrical device using the battery.
  • the battery cell provided according to the embodiment of the present application includes a shell, an electrode terminal and a current collector.
  • the shell has a first wall and a receiving cavity, and the first wall has a through hole connecting the receiving cavity and the outside of the shell.
  • the electrode terminal has a seat body and a connecting portion connected to the seat body, the seat body is located on the side of the first wall facing away from the receiving cavity, and at least part of the connecting portion is located in the through hole.
  • the current collector includes a main body and a convex portion connected to the main body, the convex portion is protruding toward the direction of the first wall, and the convex portion is used to connect the connecting portion.
  • the battery cell provided in the embodiment of the present application can effectively reduce the height of the protrusion of the current collector by arranging at least a part of the connecting portion of the electrode terminal to be located in the through hole, which is beneficial to improving the structural strength of the protrusion, and further improving the structural strength and connection reliability of the connection between the current collector and the electrode terminal, thereby helping to improve the safety performance of the battery cell.
  • Electrical devices can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc.
  • Spacecraft include airplanes, rockets, space shuttles, and spacecrafts, etc.
  • electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc.
  • electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.
  • the embodiments of the present application do not impose any special restrictions on the above-mentioned electric devices.
  • a battery 10 is provided inside the vehicle 1.
  • the battery 10 may be provided at the bottom, head, or tail of the vehicle 1.
  • the battery 10 may be used to power the vehicle 1, for example, the battery 10 may be used as an operating power source for the vehicle 1.
  • the vehicle 1 may further include a controller 1b and a motor 1a.
  • the controller 1b is used to control the battery 10 to supply power to the motor 1a, for example, to meet the power requirements of the vehicle 1 during starting, navigation and driving.
  • the battery 10 can not only serve as an operating power source for the vehicle 1, but also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.
  • the battery 10 includes a battery cell (not shown in FIG2 ).
  • the battery 10 may also include a box for accommodating the battery cell.
  • the box body is used to accommodate battery cells, and the box body can be in various structural forms.
  • the box body may include a first box body portion 11 and a second box body portion 12.
  • the first box body portion 11 and the second box body portion 12 cover each other.
  • the first box body portion 11 and the second box body portion 12 jointly define a storage space for accommodating battery cells.
  • the second box body portion 12 can be a hollow structure with an opening at one end, and the first box body portion 11 is a plate-like structure.
  • the first box body portion 11 covers the open side of the second box body portion 12 to form a box body with a storage space; the first box body portion 11 and the second box body portion 12 can also be hollow structures with an opening on one side.
  • the open side of the first box body portion 11 covers the open side of the second box body portion 12 to form a box body with a storage space.
  • the first box body portion 11 and the second box body portion 12 can be in various shapes, such as a cylinder, a cuboid, etc.
  • a sealing member such as a sealant or a sealing ring, may be provided between the first box body 11 and the second box body 12. wait.
  • the first box body portion 11 covers the second box body portion 12
  • the first box body portion 11 can also be referred to as an upper box cover
  • the second box body portion 12 can also be referred to as a lower box body.
  • the battery 10 there can be one or more battery cells. If there are multiple battery cells, the multiple battery cells can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple battery cells are connected in series and in parallel. Multiple battery cells can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells is accommodated in the box. Alternatively, multiple battery cells can be first connected in series, in parallel, or in mixed connection to form a battery module 20. Multiple battery modules 20 are then connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box.
  • FIG3 is a schematic diagram of the structure of the battery module 20 shown in FIG2.
  • the battery module 20 there are multiple battery cells 30.
  • the multiple battery cells 30 are first connected in series, in parallel, or in mixed series to form the battery module 20.
  • the multiple battery modules 20 are then connected in series, in parallel, or in mixed series to form a whole, and are accommodated in the box.
  • the multiple battery cells 30 in the battery module 20 may be electrically connected via a busbar component to achieve parallel connection, series connection, or mixed connection of the multiple battery cells 30 in the battery module 20 .
  • Fig. 4 is an exploded schematic diagram of the battery cell 30 shown in Fig. 3.
  • the battery cell 30 provided in the embodiment of the present application includes an electrode assembly 32 and a shell 31, wherein the shell 31 has a receiving cavity, and the electrode assembly 32 is received in the receiving cavity.
  • the housing 31 may include a shell 311 and an end cap 312, wherein the shell 311 is a hollow structure with one side open, and the end cap 312 covers the opening 311a of the shell 311 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 32 and the electrolyte.
  • the electrode assembly 32 When assembling the battery cell 30 , the electrode assembly 32 may be placed in the housing 311 first, the end cap 312 may be closed on the opening of the housing 311 , and then the electrolyte may be injected into the housing 311 through the electrolyte injection port on the end cap 312 .
  • the housing 31 may also be used to contain electrolyte, such as electrolyte.
  • the housing 31 may be in various structural forms.
  • the shell 311 can be in various shapes, such as a cylinder, a cuboid, etc.
  • the shape of the shell 311 can be determined according to the specific shape of the electrode assembly 32. For example, if the electrode assembly 32 is a circle If the electrode assembly 32 is a rectangular parallelepiped structure, the housing 311 may be a cylindrical structure. If the electrode assembly 32 is a rectangular parallelepiped structure, the housing 311 may be a rectangular parallelepiped structure. In FIG4 , illustratively, the housing 311 and the electrode assembly 32 are both rectangular parallelepiped structures.
  • the shell 311 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiment of the present application does not impose any special restrictions on this.
  • Electrodes assemblies 32 There may be one or more electrode assemblies 32 housed in the housing 311. In Fig. 4, there are two electrode assemblies 32 housed in the housing 311.
  • the battery cell 10 provided according to the embodiment of the present application includes a shell 31, an electrode terminal 33 and a current collector 34.
  • the shell 31 has a first wall 313 and a receiving cavity 31a, and the first wall 313 has a first through hole 313a connecting the receiving cavity 31a and the outside of the shell 31.
  • the electrode terminal 33 has a seat body 331 and a connecting portion 332 connected to the seat body 331, the seat body 331 is located on the side of the first wall 313 facing away from the receiving cavity 31a, and at least part of the connecting portion 332 is located in the first through hole 313a.
  • the current collector 34 includes a main body 341 and a convex portion 342 connected to the main body 341, the convex portion 342 is protruding toward the direction of the first wall 313, and the convex portion 342 is used to connect the connecting portion 332.
  • the first wall 313 may be a part of the housing 311 of the housing 31, or the first wall 313 may be a part of the end cover 312 of the housing 31.
  • the first through hole 313a connects the accommodating cavity 31a and the outside of the housing 31, and the first through hole 313a is arranged through the first wall 313 along the thickness direction X of the first wall 313.
  • the first through hole 313a may be a straight hole, or, according to the specific structure of the connecting portion 332 cooperating with the first through hole 313a and its positional relationship with the first through hole 313a, the inner wall of the first through hole 313a may be provided with a stepped surface.
  • the first through hole 313a may be cylindrical, elliptical, prism-shaped or other irregular shapes.
  • the base body 331 and the connecting portion 332 of the electrode terminal 33 may be integrally formed, or the base body 331 and the connecting portion 332 may be separately formed and then connected together by welding, riveting, or the like.
  • the connecting portion 332 is located on the side of the seat body 331 facing the accommodating cavity 31a, and the seat body 331 can be connected to the outer wall of the first wall 313 facing away from the accommodating cavity 31a.
  • the connecting portion 332 can be completely located in the first through hole 313a, or a part of the connecting portion 332 is located in the first through hole 313a, and there is A portion of the connecting portion 332 is located at a side of the first wall 313 of the first through hole 313a facing away from the accommodating cavity 31a.
  • a portion of the connecting portion 332 may also be located in the accommodating cavity 31a.
  • the convex portion 342 of the current collector 34 can be formed by stamping, or the convex portion 342 of the current collector 34 can be formed by milling.
  • the current collector 34 can be electrically connected to the electrode terminal 33 through the convex portion 342, and connected to the electrode assembly 32 through the body portion 341, so that the electrode terminal 33 and the electrode assembly 32 can be electrically connected through the current collector 34.
  • a portion of the convex portion 342 may be arranged to be located in the first through hole 313a, so that the convex portion 342 and the connecting portion 332 are connected in the first through hole 313a, or the convex portion 342 may not be arranged to be located in the first through hole 313a, that is, the connecting portion 332 passes through the first through hole 313a to connect with the convex portion 342.
  • the convex portion 342 may not be arranged to be located in the first through hole 313a, and the connecting portion 332 may pass through the first through hole 313a, so as to realize the connection between the connecting portion 332 and the convex portion 342 in the accommodating cavity 31a.
  • the battery cell 10 may also have an insulating member 36, which is located on the side of the first wall 313 facing the accommodating chamber 31a.
  • the insulating member 36 has a second through hole 36a, which is arranged corresponding to the first through hole 313a, so that the connecting portion 332 or the convex portion 342 passes through the second through hole 36a to connect with each other. It is possible to set a portion of the convex portion 342 to extend into the second through hole 36a, or to set the convex portion 342 to pass through the second through hole 36a and connect with the connecting portion 332 in the first through hole 313a.
  • the connecting surface of the convex portion 342 and the connecting portion 332 may be located in the first through hole 313a, or the connecting surface of the convex portion 342 and the connecting portion 332 may be located in the second through hole 36a.
  • the connecting portion 332 may also pass through the first through hole 313a and the second through hole 36a to connect with the convex portion 342 in the accommodating chamber 31a.
  • the battery cell 10 provided in the embodiment of the present application by setting the connecting portion 332 of the electrode terminal 33 to be at least partially located in the first through hole 313a, is beneficial to reducing the protruding height of the protrusion 342 of the current collecting member 34 relative to the main body portion 341, and further helps to improve the structural strength of the protrusion 342 and the connection reliability between the protrusion 342 and the electrode terminal 33. Therefore, the battery cell 10 provided in the embodiment of the present application can improve the safety performance of the battery cell 10.
  • the convex portion 342 of the current collecting member 34 is usually manufactured by a stretching or stamping process.
  • the wall thickness of the convex portion 342 is thinner.
  • the wall thickness of the convex portion 342 is too thin, its strength will be reduced, and it is easy to be welded through or deformed during welding.
  • the battery cell 10 provided in the embodiment of the present application is conducive to ensuring the wall thickness of the convex portion 342 by setting the connecting portion 332 of the electrode terminal 33 to be at least partially located in the first through hole 313a, thereby further improving the structural strength of the convex portion 342 and the welding success rate of the convex portion 342 and the electrode terminal 33.
  • the current collecting member 34 has a groove 34 b on a side facing away from the first wall 313 , and along the thickness direction X of the first wall 313 , the groove 34 b is disposed correspondingly to the protrusion 342 .
  • the groove 34b is arranged corresponding to the convex portion 342, and the groove 34b may be naturally formed in the process of processing the convex portion 342, or the groove 34b and the convex portion 342 may be formed by processing separately.
  • the blank of the current collector 34 may be provided in a sheet shape, and the convex portion 342 may be formed by a stamping process. This is beneficial to simplifying the processing technology of the current collector 34.
  • a groove 34b is provided at a position opposite to the convex portion 342 along the thickness direction X, and the convex portion 342 and the connecting portion 332 may be penetrated and welded at the groove 34b. Therefore, the current collector 34 is provided with a groove 34b arranged opposite to the convex portion 342, which is also beneficial to improving the convenience of the welding process of the convex portion 342 and the connecting portion 332.
  • the minimum wall thickness of the protrusion 342 is ⁇ 1
  • the wall thickness of the main body 341 is ⁇
  • ⁇ 1/ ⁇ may be 0.8, 0.85, 0.9 or 0.95, etc.
  • the blank of the current collector 34 can be a sheet structure with uniform thickness.
  • the protrusion 342 is processed by stamping. The higher the height of the protrusion 342 relative to the main body 341, the smaller its wall thickness is, which is less conducive to ensuring the structural strength of the protrusion 342.
  • the wall thickness of the protrusion 342 is the wall thickness of the protrusion 342 after stretching, and the wall thickness ⁇ of the main body 341 can be the wall thickness of the protrusion 342 before stamping.
  • the protrusion 342 has a top wall and a side wall surrounding the top wall.
  • the wall thickness of the side wall will be smaller than the wall thickness of the top wall, and after the protrusion 342 is connected to the connecting portion 332, the structural strength of the side wall has a greater impact on the connection strength between the protrusion 342 and the connecting portion 332. Therefore, the minimum wall thickness of the protrusion 342 can be the wall thickness of the side wall.
  • the height h of the protrusion 342 protruding from the main body 341 is Satisfies: 0 ⁇ h ⁇ 3mm.
  • the height h of the protrusion 342 protruding from the body 341 may be the distance between the surface of the protrusion 342 connected to the connection portion 332 and the surface of the body 341 facing the first wall 313 .
  • the height h of the protrusion 342 protruding from the main body 341 may be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm or 3 mm, etc.
  • the inventors found that setting h ⁇ 3mm is conducive to ensuring that the ratio of the wall thickness ⁇ 1 of the convex portion 342 to the thickness ⁇ of the main body portion 341 satisfies: 0.8 ⁇ 1/ ⁇ 1, that is, it is conducive to ensuring that the ratio of the thickness of the convex portion 342 before stretching to the thickness after stretching is greater than or equal to 0.8, which is conducive to ensuring the structural strength of the convex portion 342, thereby improving the connection strength and connection reliability of the convex portion 342 and the connecting portion 332.
  • the battery cell 10 further includes an insulating member 36, which is disposed on a side of the first wall 313 facing the accommodating cavity 31a, and the insulating member 36 has a second through hole 36a, and the second through hole 36a is disposed opposite to the first through hole 313a along the thickness direction X of the first wall 313.
  • the connecting portion 332 has a first connecting surface 332a facing the accommodating cavity 31a, and the convex portion 342 has a second connecting surface 342a, the first connecting surface 332a abuts against the second connecting surface 342a, and the first connecting surface 332a and the second connecting surface 342a are located in the first through hole 313a, and/or the first connecting surface 332a and the second connecting surface 342a are located in the second through hole 36a.
  • the insulating member 36 can be used to achieve insulation between the first wall 313 and the electrode assembly 32 in the accommodating cavity 31a.
  • the insulating member 36 can be in a sheet shape, or a portion of the insulating member 36 can be arranged to extend into the second through hole 36a.
  • a portion of the insulating member 36 can also extend into the first through hole 313a to form a step surface in the first through hole 313a or the second through hole 36a.
  • the second through hole 36a is arranged opposite to the first through hole 313a, and along the direction perpendicular to the thickness direction X, the size of the first through hole 313a can be greater than, less than, or equal to the size of the second through hole 36a.
  • the second through hole 36a can be cylindrical with the first through hole 313a, or the two can be other shapes respectively.
  • the central axes of the first through hole 313a and the second through hole 36a can coincide, or be offset from each other by a certain distance.
  • the first connecting surface 332a and the second connecting surface 342a are respectively the connecting portion 332 and the convex portion.
  • the first connecting surface 332a may be a plane, a stepped surface or a curved surface, and the second connecting surface 342a may be in a shape matching the first connecting surface 332a.
  • the protrusion 342 passes through the second through hole 36a and is connected to the connecting portion 332 in the first through hole 313a, or the connecting portion 332 passes through the first through hole 313a, the protrusion 342 passes through the second through hole 36a, and the connecting portion 332 and the protrusion 342 are interconnected at the interface between the first through hole 313a and the second through hole 36a.
  • connection portion 332 passes through the first through hole 313a and is connected to the protrusion 342 in the second through hole 36a.
  • a portion of the protrusion 342 is located in the second through hole 36a.
  • the first connecting surface 332a and the second connecting surface 342a respectively have both a portion located in the first through hole 313a and a portion located in the second through hole 36a
  • the first connecting surface 332a and the second connecting surface 342a are step surfaces or arc-shaped surfaces, then a portion of the protrusion 342 passes through the second through hole 36a and is connected to the connecting portion 332 in the first through hole 313a, and the other portion does not pass through the second through hole 36a, but is connected to the connecting portion 332 in the second through hole 36a.
  • the first connection surface 332a and the second connection surface 342a are against each other, and the first connection surface 332a and the second connection surface 342a may simply be in contact with each other, or the two may be connected into a whole by welding, riveting, etc.
  • the first connecting surface 332a and the second connecting surface 342a in the first through hole 313a, or the first connecting surface 332a and the second connecting surface 342a in the second through hole 36a it can be achieved that at least part of the protrusion 342 is located in the second through hole 36a, and the second through hole 36a can provide a certain limiting effect for the protrusion 342.
  • the first through hole 313a and the second through hole 36a jointly provide a limiting effect for the protrusion 342, limiting the displacement of the protrusion 342 relative to the insulating member 36 and the first wall 313 along the direction perpendicular to the thickness X, especially in the embodiment where the protrusion 342 is welded to the connecting portion 332, it is more convenient to connect the protrusion 342 with the connecting portion 332.
  • a size of the first connecting surface 332 a is greater than a size of the second connecting surface 342 a .
  • the first connecting surface 332a is larger than that of the second connection surface 342a, so that the first connection surface 332a covers the second connection surface 342a along the thickness direction X.
  • the first connection surface 332a and the second connection surface 342a can be circular respectively, and the diameter of the first connection surface 332a is larger than the diameter of the second connection surface 342a.
  • the connecting part 332 can provide a good support effect for the convex part 342, which facilitates the smooth progress of the welding process.
  • the first connecting surface 332a is set larger than the second connecting surface 342a, which is conducive to increasing the connection area between the first connecting surface 332a and the second connecting surface 342a, thereby improving the current-passing capacity of the current collector 34 and the electrode terminal 33.
  • the main body 341 and the first wall 313 may be directly connected or connected via an intermediate connecting member, and the specific method may be selected based on actual needs and is not limited here.
  • the battery cell 10 further includes a seal 35 , which is disposed around the connecting portion 332 , and along the thickness direction X of the first wall 313 , the seal 35 abuts between the seat 331 and the first wall 313 .
  • the side of the first wall 313 close to the seal 35 can be a flat surface, or a groove 34b is provided on the side of the first wall 313 close to the seal 35, and the first through hole 313a passes through a part of the bottom of the groove 34b, and the seal 35 abuts against the bottom of the groove 34b.
  • the sealing member 35 surrounds the connection portion 332 and the circumference of the first through hole 313 a to reduce the risk of the electrolyte in the accommodation chamber 31 a overflowing to the outside of the battery cell 10 through the first through hole 313 a .
  • the sealing member 35 may be in the form of a flat sheet, in which case the sealing member 35 is completely in contact between the first wall 313 and the main body 341.
  • the sealing member 35 may have a protrusion, which extends into the first through hole 313a and abuts against a stepped surface of the insulating member 36 extending into the second through hole 36a in the first through hole 313a, thereby further improving the sealing performance of the sealing member 35.
  • providing the sealing member 35 is beneficial to improving the sealing performance of the accommodating cavity 31 a of the battery cell 10 , reducing the risk of electrolyte leakage affecting the normal operation of the battery cell 10 , and further improving the safety performance of the battery cell 10 .
  • the seat body 331 has an abutting surface abutting against the sealing member 35 , and the distance between the abutting surface and the first connecting surface 332 a is s1 .
  • the distance from the surface to the side of the insulating member 36 facing the accommodating cavity 31a is s, and s1/s ⁇ 0.7.
  • the distance from the abutting surface to the side of the insulating member 36 facing the accommodating cavity 31a is the distance from the abutting surface to the portion of the insulating member 36 facing the accommodating cavity 31a and surrounding the circumference of the second through hole 36a.
  • the surface of the insulating member 36 facing the accommodating cavity 31a can be flat or have steps.
  • the side of the insulating member 36 facing the accommodating cavity 31a is the surface of the insulating member 36 located near the second through hole 36a and penetrated by the second through hole 36a. Therefore, the distance s here is the sum of the dimensions of the first through hole 313a, the second through hole 36a, and the portion of the sealing member 35 located between the seat body 331 and the first wall 313 after compression along the thickness direction X.
  • peripheral side surface of the connecting portion 332 and the surface of the seat body 331 facing the first wall 313 are connected by an arc surface.
  • the arc surface can be a circular arc surface, an elliptical arc surface or other irregular arc surfaces.
  • the peripheral surface of the connecting portion 332 is connected to the surface of the seat body 331 facing the first wall 313 through an arc surface. That is, the two are connected through an arc surface transition.
  • the connecting portion 332 can be formed by a stamping process.
  • the peripheral side surface of the connecting portion 332 is connected to the surface of the seat body 331 facing the first wall 313 through an arc surface.
  • the radius of curvature R of the arc-shaped surface satisfies: R ⁇ 0.5 mm.
  • Such a configuration is beneficial to further improve the smoothness of the transition between the peripheral surface of the connecting portion 332 and the surface of the seat body 331 facing the first wall 313, further reduce the risk of metal wires being generated during the stamping process of the connecting portion 332, and further improve the finished product yield of the electrode terminal 33.
  • the seal 35 can be staggered with the arc surface, and along the thickness direction X, the projection of the arc surface and the projection of the seal 35 do not overlap, and the projections of the two along the thickness direction X are arranged in an interlaced manner.
  • the arc surface will not press against the seal 35, so that the seal 35 and the abutting surface are in planar contact, and the force direction of the seal 35 is consistent, which reduces the risk of the seal 35 being lifted due to the cooperation with the arc surface, thereby causing the effective sealing area to be too small and the sealing failure.
  • connection part 332 includes a first sub-part 3321 and a second sub-part 3322 connected to each other, and the second sub-part 3322 is located on the side of the first sub-part 3321 facing the accommodating cavity 31a, the first sub-part 3321 is connected to the seat body 331, and the second sub-part 3322 is connected to the convex part 342.
  • the first sub-section 3321 and the second sub-section 3322 can be made of the same material, or the first sub-section 3321 and the second sub-section 3322 can be made of different materials.
  • the specific configuration can be based on actual conditions and is not limited here.
  • the first sub-portion 3321 is connected to the seat body 331 , and the first sub-portion 3321 and the seat body 331 can be integrally formed, or they can be separately formed and then connected together.
  • the second sub-portion 3322 is connected to the convex portion 342, which is a part of the current collector 34.
  • the main body 341 of the current collector 34 is connected to the pole tab 321 of the electrode assembly 32.
  • the specific materials of the current collector 34 and the second sub-portion 3322 can be set according to the material of the pole tab 321.
  • the material of the current collector 34 and the second sub-portion 3322 includes aluminum.
  • the material of the pole tab 321 includes copper
  • the material of the second sub-portion 3322 and the current collector 34 can include copper, and the material of the first sub-portion 3321 does not have to be copper.
  • connection part 332 includes a first sub-part 3321 and a second sub-part 3322 connected to each other, so as to reasonably design the connection part 332 according to the actual situation while realizing the connection between the parts.
  • the specific materials of the first sub-section 3321 and the second sub-section 3322 are arranged to reduce production costs and improve the connection reliability of related structures.
  • the material of the first sub-portion 3321 includes aluminum.
  • the material of the first sub-portion 3321 includes aluminum, which is beneficial to reducing the weight and production cost of the electrode terminal 33.
  • the material of the seat body 331 may include aluminum, and the first sub-portion 3321 and the seat body 331 are integrally formed to reduce processing difficulty.
  • the materials of the current collector 34 and the second sub-portion 3322 may both be aluminum to improve the connection strength of the tab 321, the current collector 34 and the second sub-portion 3322.
  • the material of the second sub-portion 3322 includes copper, and the material of the current collecting member 34 includes copper.
  • the material of the second sub-portion 3322 and the current collector 34 are both copper, which is conducive to improving the connection strength of the second sub-portion 3322, the current collector 34 and the pole tab 321, especially in the process of welding connection, which is conducive to improving the welding strength of the pole tab 321, the current collector 34 and the second sub-portion 3322.
  • the material of the first sub-portion 3321 can be aluminum, and it is not necessary to set the material of the connection portion 332 to be copper, so as to reduce the amount of copper used, thereby reducing the weight and production cost of the electrode terminal 33.
  • a dimension b of the second sub-portion 3322 along the thickness direction X of the first wall 313 satisfies: b ⁇ 0.8 mm.
  • the materials of the second sub-portion 3322 and the protrusion 342 both include copper. After in-depth research and a large number of experiments, the inventors found that when the second sub-portion 3322 and the protrusion 342 are welded together, setting the dimension b of the second sub-portion 3322 along the thickness direction X to satisfy the above relationship is beneficial to improving the reliability of the welding connection between the second sub-portion 3322 and the protrusion 342, that is, it is beneficial to improve the connection strength between the connecting portion 332 and the protrusion 342.
  • the second sub-portion 3322 is disposed on the peripheral side of the first sub-portion 3321 and on the side of the first sub-portion 3321 facing the protrusion 342.
  • the seat body 331 includes a third sub-portion 3311 and a fourth sub-portion 3312 connected to each other.
  • the fourth sub-portion 3312 surrounds the second sub-portion 3322 and is disposed on the side of the third sub-portion 3311 facing the first wall 313.
  • the sealing member 35 abuts between the first wall 313 and the fourth sub-portion 3312.
  • the fourth sub-portion 3312 is connected to the second sub-portion The peripheral side surface of 3322.
  • the third sub-portion 3311 and the fourth sub-portion 3312 may be formed separately or integrally formed.
  • the second sub-portion 3322 is arranged on the peripheral side of the first sub-portion 3321 and on the side of the first sub-portion 3321 facing the protrusion 342.
  • the second sub-portion 3322 covers the first sub-portion 3321. No part of the first sub-portion 3321 is exposed to the outside, and thus will not contact the electrolyte in the battery cell 10, which is beneficial to reduce the risk of the electrolyte corroding the first sub-portion 3321.
  • the fourth sub-section 3312 is connected to the peripheral side surface of the second sub-section 3322.
  • the fourth sub-section 3312 and the second sub-section 3322 can be separately processed and formed and then connected together by welding, riveting, etc., or the fourth sub-section 3312 and the second sub-section 3322 can be integrally processed and formed.
  • the specific method can be selected according to actual needs.
  • the fourth sub-section 3312 is disposed on the peripheral side surface of the second sub-section 3322, so that the interface between the second sub-section 3322 and the first sub-section 3321 is not exposed to the electrolyte, so that it is not easy to cause corrosion on the interface between the second sub-section 3322 and the first sub-section 3321.
  • the cross-section of the fourth sub-section 3312 and the third sub-section 3311 is located outside the sealing member 35, and is not easy to contact the electrolyte, so it is not easy to cause corrosion at the interface between the third sub-section 3311 and the fourth sub-section 3312.
  • the second sub-section 3322, the first sub-section 3321 and the third sub-section 3311 may be integrally formed, as shown in FIG. 10 . This may also reduce the possibility of the electrolyte corroding the connection interface of different materials.
  • the second sub-portion 3322 and the fourth sub-portion 3312 are integrally formed.
  • the second sub-section 3322 and the fourth sub-section 3312 are integrally formed, and the blanks of the two can be set to be flat, and the second sub-section 3322 and the fourth sub-section 3312 can be integrally formed by a process such as stamping. In this way, the materials of the second sub-section 3322 and the fourth sub-section 3312 can be the same, and the materials of the second sub-section 3322 and the fourth sub-section 3312 can be the same.
  • the composite interface between the second sub-section 3322 and the fourth sub-section 3312 and the first sub-section 3321 and the third sub-section 3311 are located on the side of the seal 35 away from the electrolyte, that is, on the outside of the sealing interface of the seal 35.
  • the materials used for the second sub-section 3322 and the fourth sub-section 3312 and the composite interface of the first sub-section 3321 and the third sub-section 3311 with the electrolyte are close to each other. Being isolated by the seal 35 , corrosion is not likely to occur at the composite interface, which is beneficial to further improve the structural stability of the electrode terminal 33 .
  • the first sub-portion 3321 and the third sub-portion 3311 are integrally formed.
  • the first sub-portion 3321 and the third sub-portion 3311 can be formed by the same material through a stamping process, thereby simplifying the structural complexity of the electrode terminal 33 and improving the processing efficiency of the electrode terminal 33 .
  • an end surface of the fourth sub-portion 3312 is located on a side of the peripheral surface of the sealing member 35 facing away from the connecting portion 332 .
  • the fourth sub-portion 3312 extends in a direction perpendicular to the thickness direction X and exceeds the peripheral surface of the sealing member 35. In this way, the end surface of the fourth sub-portion 3312 is located outside the sealing interface of the sealing member 35, further reducing the possibility of the composite interface of the fourth sub-portion 3312 and the third sub-portion 3311 being corroded by the electrolyte.
  • connection portion 332 may be integrally formed and made of copper material.
  • the connection portion 332 is made of aluminum. This helps to improve the machinability of the connection portion 332 and improve the processing efficiency of the connection portion 332 .
  • the battery cell 10 provided in the embodiments of the present application includes an electrode terminal 33, a housing 31, a current collector 34, an insulating member 36, and a sealing member 35.
  • the housing 31 has a first wall 313 and a receiving cavity 31a, the first wall 313 has a first through hole 313a connecting the receiving cavity 31a and the outside of the housing 31, the electrode terminal 33 includes a seat 331 and a connecting portion 332 connected to the seat 331, and at least part of the connecting portion 332 is located in the first through hole 313a.
  • the insulating member 36 is provided on the side of the first wall 313 facing the receiving cavity 31a, and the insulating member 36 has a second through hole 36a, the second through hole 313a and the first through hole 313a are both cylindrical, and the axes of the second through hole 36a and the first through hole 313a coincide.
  • the insulating member 36 has a portion extending into the second through hole 36a and the first through hole 313a, and is in the shape of a step surface in the first through hole 36a or the second through hole 36a.
  • the sealing member 35 is annular and has a protrusion extending into the first through hole 313a. A portion of the sealing member 35 is sandwiched between the base 331 of the electrode terminal 33 and the first wall 313.
  • the protrusion of the sealing member 35 extends into the first through hole 313a and abuts against the step surface of the insulating member 36 located in the first through hole 36a or the second through hole 36a.
  • the current collector 34 includes a main body 341 and a protrusion 342 connected to the main body 341.
  • the protrusion 342 is formed by a stamping process.
  • the height h of the protrusion 342 protruding from the main body 341 satisfies: 0 ⁇ h ⁇ 3mm, so that the relationship between the wall thickness ⁇ 1 of the protrusion 342 and the wall thickness ⁇ of the main body 341 satisfies: 0.8 ⁇ 1/ ⁇ 1.
  • connection surface between the connection portion 332 of the electrode terminal 33 and the protrusion 342 of the current collector 34 is located in the first through hole 313a or in the second through hole 36a, that is, the protrusion 342 is at least partially located in the second through hole 36a, so as to play a limiting role in the process of connecting the protrusion 342 and the connection portion 332.
  • the connection portion 332 includes a first sub-portion 3321 and a second sub-portion 3322, the second sub-portion 3322 is located on the side of the first sub-portion 3321 facing the accommodating cavity 31a, the first sub-portion 3321 is connected to the seat body 331, and the second sub-portion 3322 is connected to the protrusion 342.
  • the seat body 331 includes a third sub-portion 3311 and a fourth sub-portion 3312 connected to each other.
  • the fourth sub-portion 3312 surrounds the second sub-portion 3322 and is arranged on the side of the third sub-portion 3311 facing the first wall 313. At least part of the seal 35 abuts between the first wall 313 and the fourth sub-portion 3312.
  • the first sub-portion 3321 and the third sub-portion 3311 are integrally formed, and the second sub-portion 3322 and the fourth sub-portion 3312 are integrally formed and formed by a stamping process.
  • the material of the first sub-portion 3321 and the third sub-portion 3311 includes aluminum, and the material of the second sub-portion 3322, the fourth sub-portion 3312 and the convex portion 342 includes copper. In this way, while reducing the processing difficulty of the electrode terminal 33, the amount of copper used in the electrode terminal 33 can be reduced, and the connection reliability of the electrode terminal 33 and the convex portion 342 and other structures is ensured.
  • the battery cell 10 provided in the embodiment of the present application can reduce the size of the connecting portion 332 of the electrode terminal 33, at least part of which is located in the first through hole 313a, and the convex portion 342 is arranged to extend into the second through hole 36a, which is conducive to reducing the size of the convex portion 342 extending into the second through hole 36a, improving the structural strength of the convex portion 342, and further improving the working reliability of the current collector 34, which is conducive to improving the safety performance of the battery cell 10.
  • the composite interface of copper and aluminum is located on the side of the composite interface of the seal 35, the first wall 313 and the seat 331 facing away from the electrolyte, that is, the composite interface of copper and aluminum is isolated from the electrolyte inside the battery cell by the sealing interface formed by the seal 35, which is conducive to reducing the corrosion of the electrolyte to copper and aluminum, and further improving the structural stability of the electrode terminal 33.
  • the battery 10 provided according to an embodiment of the present application includes the battery cell 10 provided in any one of the above embodiments.
  • the battery 10 provided in the embodiment of the present application has the same technical effect as the battery cell 10 provided in any of the above embodiments, and thus will not be described in detail here.
  • the electrical device provided according to the embodiment of the present application includes the battery 10 provided in the above embodiment, and the battery 10 is used to provide electrical energy.
  • the electric device provided in the embodiment of the present application has the same technical effect as the battery 10 provided in the embodiment of the present application, and thus will not be described in detail here.

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Abstract

本申请提供一种电池单体、电池以及用电装置，电池单体包括外壳、电极端子以及集流件；外壳具有第一壁和容纳腔，第一壁具有连通容纳腔和外壳外部的第一通孔；电极端子具有座体和连接于座体的连接部，座体位于第一壁背向容纳腔的一侧，连接部的至少部分位于第一通孔内；集流件包括本体部和连接于本体部的凸部，凸部朝向第一壁的方向凸出设置，凸部用于连接连接部。本申请提供的电池单体，有利于降低集流件的凸部相对于本体部的凸出高度，并有利于提高凸部的结构强度以及凸部与电极端子的连接可靠性，进而有利于提高电池单体的安全性能。

Description

电池单体、电池以及用电装置
相关申请的交叉引用
本申请要求享有于2022年09月28日提交的名称为“电池单体、电池以及用电装置”的中国专利申请202222587887.1的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及电池技术领域，特别涉及一种电池单体、电池以及用电装置。
背景技术
电池广泛用于电子设备，例如手机、笔记本电脑、电瓶车、电动汽车、电动飞机、电动轮船、电动玩具汽车、电动玩具轮船、电动玩具飞机和电动工具等等。电池单体可以包括镉镍电池单体、氢镍电池单体、锂离子电池单体和二次碱性锌锰电池单体等。
在电池单体技术的发展中，除了提高电池单体的使用性能外，如何电提高电池单体的安全性能也是一个不可忽视的问题。因此，如何提高电池单体的安全性能，是电池单体技术中一个持续改进的技术问题。
发明内容
本申请提供了一种电池单体、电池以及用电装置，能够提高电池单体的安全性能。
第一方面，本申请实施例提供的电池单体包括外壳、电极端子以及集流件；外壳具有第一壁和容纳腔，第一壁具有连通容纳腔和外壳外部的第一通孔；电极端子具有座体和连接于座体的连接部，座体位于第一壁背 向容纳腔的一侧，连接部的至少部分位于第一通孔内；集流件包括本体部和连接于本体部的凸部，凸部朝向第一壁的方向凸出设置，凸部用于连接连接部。
本申请实施例提供的电池单体，通过设置电极端子的连接部的至少部分位于第一通孔内，有利于降低集流件的凸部相对于本体部的凸出高度，进而有利于提高凸部的结构强度以及凸部与电极端子的连接可靠性，因此，本申请实施例提供的电池单体有利于提高电池单体的安全性能。
在一些实施例中，集流件背向第一壁的一侧具有凹槽，沿第一壁的厚度方向，凹槽与凸部对应设置。如此设置，可以采用冲压工艺形成凸部，有利于简化集流件的加工工艺，在凸部与连接部焊接连接的实施例中，还有利于提高凸部与连接部焊接工艺的便利性。
在一些实施例中，凸部的最小壁厚为δ1，本体部的壁厚为δ，0.8≤δ1/δ＜1。如此，有利于保证凸部的结构强度，进而提高凸部与连接部的连接强度和连接可靠性。
在一些实施例中，凸部凸出本体部的高度h满足：0＜h≤3mm。如此设置，有利于保证凸部的壁厚δ1与本体部的厚度δ的比值满足：0.8≤δ1/δ＜1，即有利于保证凸部在拉伸前的厚度与拉伸后的厚度的比值大于或者等于0.8，如此，有利于保证凸部的结构强度，进而提高凸部与连接部的连接强度和连接可靠性。
在一些实施例中，电池单体还包括绝缘件，绝缘件设于第一壁面向容纳腔的一侧，绝缘件具有第二通孔，沿第一壁的厚度方向，第二通孔与第一通孔相对设置；连接部具有面向容纳腔的第一连接面，凸部具有第二连接面，第一连接面与第二连接面相抵，第一连接面和第二连接面位于第一通孔内，和/或，第一连接面和第二连接面位于第二通孔内。如此设置，可以实现凸部的至少部分位于第二通孔内，第二通孔可以为凸部提供一定的限位作用，在凸部有部分位于第一通孔内的情况下，第一通孔与第二通孔共同为凸部提供限位作用，限制凸部相对于绝缘件和第一壁沿垂直于厚度方向的位移，尤其是在凸部与连接部焊接连接的实施例中，更加便于凸部与连接部的连接。
在一些实施例中，沿垂直于厚度方向的方向，第一连接面的尺寸大于第二连接面的尺寸。如此，便于凸部与连接部的连接，在由凸部背向连接部的一侧对凸部和连接部进行焊接的情况下，连接部可以为凸部提供良好的支撑效果，便于焊接工艺的顺利进行。且设置第一连接面大于第二连接面，有利于提高第一连接面和第二连接面的连接面积，进而提高集流件和电极端子的过流能力。
在一些实施例中，电池单体还包括密封件，密封件环绕连接部设置，沿第一壁的厚度方向，密封件至少部分抵接于座体和第一壁之间。设置密封件，有利于提高对电池单体的容纳腔的密封性能，降低电解液泄漏而影响电池单体正常工作的风险，进一步提高电池单体的安全性能。
在一些实施例中，座体具有与密封件抵接的抵接表面，抵接表面到第一连接面的距离为s1，抵接表面到绝缘件面向容纳腔一侧的距离为s，s1/s≤0.7。如此，有利于保证凸部伸入第一通孔或者第二通孔部分的尺寸大小足够对凸部进行定位，进一步提高凸部和连接部连接的稳定性和便利性。
在一些实施例中，连接部的周侧表面和座体面向第一壁的表面通过弧形面连接。如此，在连接部冲压成型的过程中，有利于降低在连接部的周侧表面与座体面向第一壁的表面的相交处产生金属丝的风险，进而有利于提高电极端子成品良率。
在一些实施例中，弧形面的曲率半径R满足：R≥0.5mm。如此，在连接部冲压成型的过程中，进一步有利于降低在连接部的周侧表面与座体面向第一壁的表面的相交处产生金属丝的风险，进而有利于提高电极端子成品良率。
在一些实施例中，沿垂直于第一壁厚度方向的方向，密封件和连接部间具有间隙，沿第一壁的厚度方向，弧形面的投影和密封件的投影不重叠。如此，弧形面不会抵压到密封件，是的密封件和抵接表面平面接触，受力方向一致，降低密封件和弧形件干涉翘起导致有效密封面积过小，进而引起密封失效的风险。
在一些实施例中，连接部包括相互连接的第一子部和第二子部，第 二子部位于第一子部面向容纳腔的一侧，第一子部与座体连接，第二子部与凸部连接。如此，便于根据实际情况，在实现相关结构的相互连接的前提下，合理设置第一子部和第二子部的具体材料，以降低生产成本，并提高相关结构的连接可靠性。
在一些实施例中，第一子部的材料包括铝。有利于降低电极端子的质量和生产成本，且座体的材料可以包括铝，并设置第一子部和座体一体成型，以降低加工难度。
在一些实施例中，第二子部的材料包括铜，集流件的材料包括铜。有利于提高第二子部、集流件和极耳的连接强度，尤其是在焊接连接的过程中，有利于提高极耳、集流件以及第二子部的焊接强度。且此时第一子部的材料可以是铝，不必设置连接部的材料均为铜，以降低铜的用量，进而降低电极端子的重量和生产成本。
在一些实施例中，第二子部沿第一壁的厚度方向尺寸b满足：b≥0.8mm。如此，有利于提高第二子部与凸部焊接连接的可靠性，即有利于提高连接部和凸部的连接强度。
在一些实施例中，第二子部设于第一子部的周侧以及第一子部朝向凸部的一侧；座体包括相互连接的第三子部和第四子部，第四子部环绕第二子部并设于第三子部朝向第一壁的一侧，密封件抵接于第一壁与第四子部之间；第四子部连接于第二子部的周侧表面。第二子部与第一子部的交界面没有暴露在电解液中，如此，不容易对第二子部和第一子部的界面造成腐蚀。而第四子部与第三子部的界面位于密封件与座体的密封界面的远离电解液的一侧，不易接触电解液，也就不容易在第三子部和第四子部的界面处发生腐蚀，进一步提高电极端子结构的稳定性。
在一些实施例中，第二子部与第四子部一体成型设置。第二子部与第四子部分别与第一子部和第三子部的复合界面位于密封件的密封界面远离电解液的一侧，即位于密封件的外侧，换言之，第二子部和第四子部所采用的材料与第一字部和第三子部的复合界面与电解液被密封件隔绝，复合界面处不容易发生腐蚀，有利于进一步提高电极端子的结构稳定性。
在一些实施例中，第一子部与第三子部一体成型设置。第一子部和 第三子部可以采用同种材料通过冲压工艺成型，简化电极端子的结构复杂程度，提高电极端子的加工效率。
在一些实施例中，沿垂直于第一壁的厚度方向的方向，第四子部端面位于密封件周侧表面背向连接部的侧部。如此，第四子部的端面位于密封件的密封界面的外侧，进一步降低复合界面被电解液腐蚀的可能性。
第二方面，本申请实施例提供了一种电池，包括如第一方面任一实施例的电池单体。
根据本申请实施例提供的电池，由于采用上述任一实施例提供的电池单体，因而具有同样的技术效果，在此不再赘述。
第三方面，本申请实施例提供了一种用电装置，包括如第二方面实施例的电池，电池用于提供电能。
根据本申请实施例提供的用电装置，由于采用了本申请实施例提供的电池，因而具有同样的技术效果，在此不再赘述。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所描述的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据附图获得其他的附图。
图1为本申请一实施例提供的车辆的结构示意图；
图2为本申请一实施例提供的电池的爆炸示意图；
图3为本申请实施例提供的电池中电池模块的结构示意图；
图4为本申请一些实施例提供的一种电池单体的爆炸示意图；
图5为本申请实施例提供的电池单体省略部分结构后的主视图；
图6为图5沿A-A的剖视结构示意图；
图7为图6中B处的一种局部放大图；
图8为图6中B处的另一种局部放大图；
图9为图6中B处的又一种局部放大图；
图10为图6中B处的还一种局部放大图；
图11为图6中B处的再一种局部放大图；
在附图中，附图并未按照实际的比例绘制。
标记说明：
1、车辆；1a、马达；1b、控制器；
10、电池；11、第一箱体部；12、第二箱体部；
20、电池模块；
30、电池单体；31、外壳；31a、容纳腔；311、壳体；311a、开
口；312、端盖；313、第一壁；313a、第一通孔；32、电极组件；321、极耳；33、电极端子；331、座体；3311、第三子部；3312、第四子部；332、连接部；332a、第一连接面；3321、第一子部；3322、第二子部；34、集流件；341、本体部；342、凸部；342a、第二连接面；34b、凹槽；35、密封件；36、绝缘件；36a、第二通孔；
X、厚度方向。
具体实施方式
下面结合附图和实施例对本申请的实施方式作进一步详细描述。以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
在本申请中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位 置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本申请所描述的实施例可以与其它实施例相结合。
在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连。对于本领域的普通技术人员而言，可视具体情况理解上述术语在本申请中的具体含义。
本申请中，电池单体可以包括锂离子二次电池单体、锂离子一次电池单体、锂硫电池单体、钠锂离子电池单体、钠离子电池单体或镁离子电池单体等，本申请实施例对此并不限定。电池单体可呈圆柱体、扁平体、长方体或其它形状等，本申请实施例对此也不限定。电池单体一般按封装的方式分成三种：柱形电池单体、方形电池单体和软包电池单体，本申请实施例对此也不限定。
本申请的实施例所提到的电池是指包括一个或多个电池单体以提供更高的电压和容量的单一的物理模块。例如，本申请中所提到的电池可以包括电池模块或电池包等。电池一般包括用于封装一个或多个电池单体的箱体。箱体可以避免液体或其他异物影响电池单体的充电或放电。
电池单体包括电极组件和电解液，电极组件包括正极极片、负极极片和分隔件。电池单体主要依靠金属离子在正极极片和负极极片之间移动来工作。正极极片包括正极集流体和正极活性物质层，正极活性物质层涂覆于正极集流体的表面；正极集流体包括正极集流部和凸出于正极集流部的正极凸部，正极集流部涂覆有正极活性物质层，正极凸部的至少部分未涂覆正极活性物质层，正极凸部作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质层包括正极活性物质，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负极极片包括负极集流体和负极活性物质层，负极活性物质层涂覆于负极集流体的表面；负极集流体包括负极集流部和凸出于负极集流部的负极凸部，负极集流部涂覆有负极活性物质层，负极凸部的至少部分未涂覆负极活性物质层，负极凸部 作为负极极耳。负极集流体的材料可以为铜，负极活性物质层包括负极活性物质，负极活性物质可以为碳或硅等。为了保证通过大电流而不发生熔断，正极极耳的数量为多个且层叠在一起，负极极耳的数量为多个且层叠在一起。分隔件的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。此外，电极组件可以是卷绕式结构，也可以是叠片式结构，本申请实施例并不限于此。
发明人发现电池单体的安全性能较低的问题后，便对电池单体的结构和工作过程进行了系统的分析和研究，结果发现，电池单体中，电极端子和集流件之间具有外壳，为了实现电极端子和集流件的连接，相关技术中，设置集流件具有凸部，通过凸部朝向电极端子延伸，并与电极端子连接，以此，实现电极端子与集流件的电连接。然而，凸部相对于本体部的高度过高，导致凸部的结构强度较低，电极端子与集流件的连接强度也较低，易造成电极端子与集流件电连接失效，如此，严重影响了电池单体的工作可靠性和安全性能。
基于发明人发现的上述问题，发明人对电池单体的结构进行了改进，本申请实施例描述的技术方案适用于电池单体、包含电池单体的电池以及使用电池的用电装置。
根据本申请实施例提供的电池单体包括外壳、电极端子和集流件。外壳具有第一壁和容纳腔，第一壁具有连通容纳腔和外壳外部的通孔。电极端子具有座体和连接于座体的连接部，座体位于第一壁背向容纳腔的一侧，连接部的至少部分位于通孔内。集流件包括本体部和连接于本体部的凸部，凸部朝向第一壁的方向凸出设置，凸部用于连接连接部。
本申请实施例提供的电池单体，通过设置电极端子的连接部的至少部分位于通孔内，可以有效地降低集流件的凸部的高度，有利于提高凸部的结构强度，进而提高集流件与电极端子连接的结构强度和连接可靠性，如此，有利于提高电池单体的安全性能。
用电装置可以是车辆、手机、便携式设备、笔记本电脑、轮船、航天器、电动玩具和电动工具等等。车辆可以是燃油汽车、燃气汽车或新能源汽车，新能源汽车可以是纯电动汽车、混合动力汽车或增程式汽车等； 航天器包括飞机、火箭、航天飞机和宇宙飞船等等；电动玩具包括固定式或移动式的电动玩具，例如，游戏机、电动汽车玩具、电动轮船玩具和电动飞机玩具等等；电动工具包括金属切削电动工具、研磨电动工具、装配电动工具和铁道用电动工具，例如，电钻、电动砂轮机、电动扳手、电动螺丝刀、电锤、冲击电钻、混凝土振动器和电刨等等。本申请实施例对上述用电装置不做特殊限制。
以下实施例为了方便说明，以用电装置为车辆为例进行说明。
如图1所示，车辆1的内部设置有电池10。电池10可以设置在车辆1的底部或头部或尾部。电池10可以用于车辆1的供电，例如，电池10可以作为车辆1的操作电源。
车辆1还可以包括控制器1b和马达1a。控制器1b用来控制电池10为马达1a供电，例如，用于车辆1的启动、导航和行驶时的工作用电需求。
在本申请一些实施例中，电池10不仅仅可以作为车辆1的操作电源，还可以作为车辆1的驱动电源，代替或部分地代替燃油或天然气为车辆1提供驱动动力。
参见图2所示，电池10包括电池单体(图2未示出)。电池10还可以包括用于容纳电池单体的箱体。
箱体用于容纳电池单体，箱体可以是多种结构形式。在一些实施例中，箱体可以包括第一箱体部部11和第二箱体部12。第一箱体部11与第二箱体部12相互盖合。第一箱体部11和第二箱体部12共同限定出用于容纳电池单体的容纳空间。第二箱体部12可以是一端开口的空心结构，第一箱体部11为板状结构，第一箱体部11盖合于第二箱体部12的开口侧，以形成具有容纳空间的箱体；第一箱体部11和第二箱体部12也可以均为一侧开口的空心结构。第一箱体部11的开口侧盖合于第二箱体部12的开口侧，以形成具有容纳空间的箱体。当然，第一箱体部11和第二箱体部12可以是多种形状，比如，圆柱体、长方体等。
为提高第一箱体部11和第二箱体部12连接后的密封性，第一箱体部11和第二箱体部12之间还可以设置密封件，比如，密封胶、密封圈 等。
假设第一箱体部11盖合于第二箱体部12，第一箱体部11亦可称之为上箱盖，第二箱体部12亦可称之为下箱体。
在电池10中，电池单体可以是一个，也可以是多个。若电池单体为多个，多个电池单体之间可串联或并联或混联。混联是指多个电池单体中既有串联又有并联。多个电池单体之间可直接串联或并联或混联在一起，再将多个电池单体构成的整体容纳于箱体内，也可以是多个电池单体先串联或并联或混联组成电池模块20。多个电池模块20再串联或并联或混联形成一个整体，并容纳于箱体内。
在一些实施例中，如图3所示，图3为图2所示的电池模块20的结构示意图。在电池模块20中，电池单体30为多个。多个电池单体30先串联或并联或混联组成电池模块20。多个电池模块20再串联或并联或混联形成一个整体，并容纳于箱体内。
在一些实施例，电池模块20中的多个电池单体30之间可通过汇流部件实现电连接，以实现电池模块20中的多个电池单体30的并联或串联或混联。
请参照图4，图4为图3所示的电池单体30的爆炸示意图。本申请实施例提供的电池单体30包括电极组件32和外壳31，外壳31具有容置腔，电极组件32容纳于容置腔内。
在一些实施例中，外壳31可以包括壳体311和端盖312，壳体311为一侧开口的空心结构，端盖312盖合于壳体311的开口311a处并形成密封连接，以形成用于容纳电极组件32和电解质的密封空间。
在组装电池单体30时，可先将电极组件32放入壳体311内，再将端盖312盖合于壳体311的开口，然后经由端盖312上的电解质注入口将电解质注入壳体311内。
在一些实施例中，外壳31还可用于容纳电解质，例如电解液。外壳31可以是多种结构形式。
壳体311可以是多种形状，比如，圆柱体、长方体等。壳体311的形状可以根据电极组件32的具体形状来确定。例如，若电极组件32为圆 柱体结构，壳体311则可选用为圆柱体结构。若电极组件32为长方体结构，壳体311则可选用长方体结构。在图4中，示例性地，壳体311和电极组件32均为长方体结构。
壳体311的材质可以是多种，比如，铜、铁、铝、不锈钢、铝合金等，本申请实施例对此不作特殊限制。
容纳于壳体311内的电极组件32可以是一个或多个。在图4中，容纳于壳体311内的电极组件32为两个。
如图5、图6和图7所示，根据本申请实施例提供的电池单体10包括外壳31、电极端子33和集流件34。外壳31具有第一壁313和容纳腔31a，第一壁313具有连通容纳腔31a和外壳31外部的第一通孔313a。电极端子33具有座体331和连接于座体331的连接部332，座体331位于第一壁313背向容纳腔31a的一侧，连接部332的至少部分位于第一通孔313a内。集流件34包括本体部341和连接于本体部341的凸部342，凸部342朝向第一壁313的方向凸出设置，凸部342用于连接连接部332。
第一壁313可以是外壳31的壳体311的一部分，或者，第一壁313可以是外壳31的端盖312的一部分。第一通孔313a连通容纳腔31a和外壳31的外部，则第一通孔313a沿第一壁313的厚度方向X贯穿第一壁313设置。
可选地，第一通孔313a可以是直孔，或者，根据与第一通孔313a配合的连接部332的具体结构及其与第一通孔313a的位置关系，设置第一通孔313a的内壁具有台阶面。
可选地，第一通孔313a可以呈圆柱形、椭圆柱形、棱柱状或者其它不规则形状。
电极端子33的座体331和连接部332可以一体加工成型，或者，设置座体331和连接部332分别加工成型后，再通过焊接、铆接等方式连接在一起。
连接部332位于座体331朝向容纳腔31a的一侧，座体331可以连接于第一壁313背向容纳腔31a一侧的外壁。连接部332可以全部位于第一通孔313a内，或者，连接部332的一部分位于第一通孔313a内，且有 一部分位于第一通孔313a第一壁313背向容纳腔31a的一侧，当然，也可以设置连接部332的一部分位于容纳腔31a内。
集流件34的凸部342可以通过冲压成型的方式加工成型，或者，设置集流件34的凸部342通过铣削的加工方式加工成型。集流件34可以通过凸部342实现与电极端子33的电连接，通过本体部341实现对电极组件32的连接，如此，可以实现电极端子33和电极组件32通过集流件34电连接。
可选地，可以设置凸部342的一部分位于第一通孔313a内，以使凸部342和连接部332在第一通孔313a内连接，或者，设置凸部342没有位于第一通孔313a内，即连接部332穿过第一通孔313a与凸部342连接。在一些实施例中，可以设置凸部342没有位于第一通孔313a内，而设置连接部332穿过第一通孔313a，以在容纳腔31a内实现连接部332与凸部342的连接。
可选地，电池单体10还可以具有绝缘件36，绝缘件36位于第一壁313面向容纳腔31a的一侧。绝缘件36具有第二通孔36a，第二通孔36a与第一通孔313a对应设置，以使连接部332或者凸部342穿过第二通孔36a彼此连接。可以设置凸部342的部分伸入第二通孔36a内，或者设置凸部342穿过第二通孔36a，并在第一通孔313a内与连接部332连接。也就是说，凸部342与连接部332的连接面可以位于第一通孔313a内，或者，设置凸部342与连接部332的连接面位于第二通孔36a内，当然也可以设置连接部332穿过第一通孔313a和第二通孔36a，在容纳腔31a内与凸部342连接。
本申请实施例提供的电池单体10，通过设置电极端子33的连接部332至少部分位于第一通孔313a内，有利于降低集流件34的凸部342相对于本体部341的凸出高度，进而有利于提高凸部342的结构强度以及凸部342与电极端子33的连接可靠性，因此，本申请实施例提供的电池单体10能够提高电池单体10的安全性能。
另一方面，通常集流件34的凸部342是通过拉伸或者冲压工艺制造，当凸部342相对本体部341的凸出高度越大，凸部342的壁厚越薄， 当凸部342壁厚过薄，其强度会降低，且在焊接时容易发生焊穿或变形。本申请实施例提供的电池单体10，通过设置电极端子33的连接部332至少部分位于第一通孔313a内，有利于保证凸部342的壁厚，进一步提高凸部342的结构强度以及凸部342与电极端子33的焊接成功率。
在一些实施例中，集流件34背向第一壁313的一侧具有凹槽34b，沿第一壁313的厚度方向X，凹槽34b与凸部342对应设置。
凹槽34b与凸部342对应设置，则可以是在加工凸部342的过程中自然形成的凹槽34b，或者，凹槽34b和凸部342分别加工形成。
示例性地，可以设置集流件34的毛坯件呈片状，并通过冲压工艺加工形成凸部342。有利于简化集流件34的加工工艺。在凸部342与连接部332焊接连接的实施例中，设置凸部342沿厚度方向X相对的位置具有凹槽34b，可以在凹槽34b处对凸部342和连接部332进行穿透焊接连接，因此，设置集流件34具有与凸部342相对设置的凹槽34b，还有利于提高凸部342与连接部332的焊接工艺的便利性。
如图7所示，在一些实施例中，凸部342的最小壁厚为为δ1，本体部341的壁厚为δ，0.8≤δ1/δ＜1。
示例性地，δ1/δ可以为0.8、0.85、0.9或者0.95等。
集流件34的毛坯件可以是一个厚度均匀的片状结构，凸部342通过冲压成型的方式加工而成，凸部342相对于本体部341的高度越高，其壁厚就越小，越不利于保证凸部342的结构强度。凸部342的壁厚为凸部342拉伸成型后的壁厚，而本体部341的壁厚δ可以为凸部342在冲压成型前的壁厚。凸部342具有顶壁和围设于顶壁周侧的侧壁，在冲压成型的过程中，侧壁的壁厚会小于顶壁的壁厚，且在凸部342与连接部332连接完成后，侧壁的结构强度对对凸部342和连接部332的连接强度的影响较大。因此，凸部342的最小壁厚可以为侧壁的壁厚。发明人在经过深入研究和大量实验之后发现，设置0.8≤δ1/δ＜1，即设置凸部342在冲压前的厚度与冲压后的厚度的比值大于或者等于0.8，如此，有利于保证凸部342的结构强度，进而提高凸部342与连接部332的连接强度和连接可靠性。
如图7所示，在一些实施例中，凸部342凸出本体部341的高度h 满足：0＜h≤3mm。
凸部342凸出本体部341的高度h可以为凸部342与连接部332连接一侧的表面与本体部341面向第一壁313一侧的表面的距离。
示例性地，凸部342凸出本体部341的高度h可以为0.5mm、1mm、1.5mm、2mm、2.5mm或者3mm等。
在凸部342通过冲压成型工艺加工成型的实施例中，凸部342凸出本体部341的高度越高，凸部342对应的壁厚δ1就越小。发明人在经过深入研究和大量实验之后发现，设置h≤3mm，有利于保证凸部342的壁厚δ1与本体部341的厚度δ的比值满足：0.8≤δ1/δ＜1，即有利于保证凸部342在拉伸前的厚度与拉伸后的厚度的比值大于或者等于0.8，如此，有利于保证凸部342的结构强度，进而提高凸部342与连接部332的连接强度和连接可靠性。
在一些实施例中，电池单体10还包括绝缘件36，绝缘件36设于第一壁313面向容纳腔31a的一侧，绝缘件36具有第二通孔36a，沿第一壁313的厚度方向X，第二通孔36a与第一通孔313a相对设置。连接部332具有面向容纳腔31a的第一连接面332a，凸部342具有第二连接面342a，第一连接面332a与第二连接面342a相抵，第一连接面332a和第二连接面342a位于第一通孔313a内，和/或，第一连接面332a和第二连接面342a位于第二通孔36a内。
绝缘件36可以用于实现第一壁313与容纳腔31a内的电极组件32的绝缘，绝缘件36可以呈片状，也可以设置绝缘件36的一部分伸入到第二通孔36a内，可选地，绝缘件36的一部分也可以伸入到第一通孔313a内，以在第一通孔313a内活着第二通孔36a内形成台阶面。
沿第一壁313的厚度方向X，第二通孔36a与第一通孔313a相对设置，则沿垂直于厚度方向X的方向，第一通孔313a的尺寸可以大于、小于或者等于第二通孔36a的尺寸。第二通孔36a可以是与第一通孔313a均呈圆柱形，或者，二者分别呈其它的形状。第一通孔313a和第二通孔36a的中心轴线可以重合，或者相互偏移一定的距离。
第一连接面332a和第二连接面342a分别为连接部332和凸部 342相互连接的表面。第一连接面332a可以呈平面、台阶面或者曲面等，第二连接面342a呈与第一连接面332a相适配的形状。
在第一连接面332a和第二连接面342a位于第一通孔313a内的实施例中，凸部342穿过第二通孔36a，并在第一通孔313a内与连接部332连接，或者，连接部332贯穿第一通孔313a，凸部342贯穿第二通孔36a，连接部332和凸部342在第一通孔313a和第二通孔36a的交界面相互连接。
在第一连接面332a和第二连接面342a位于第二通孔36a内的实施例中，连接部332穿过第一通孔313a，并在第二通孔36a内与凸部342连接。凸部342的一部分位于第二通孔36a内。
而在第一连接面332a和第二连接面342a分别既有位于第一通孔313a内的部分，又有位于第二通孔36a内的部分的实施例中，第一连接面332a和第二连接面342a呈台阶面或者弧形面，则凸部342的一部分贯穿第二通孔36a并在第一通孔313a内与连接部332连接，另一部分没有穿过第二通孔36a，而是在第二通孔36a内与连接部332连接。
第一连接面332a与第二连接面342a相抵，则第一连接面332a与第二连接面342a可以仅仅是接触在一起，也可以是二者通过焊接、铆接等方式连接成一个整体。
因此，设置第一连接面332a好和第二连接面342a在第一通孔313a内，或者，第一连接面332a和第二连接面342a在第二通孔36a内，都可以实现凸部342的至少部分位于第二通孔36a内，第二通孔36a可以为凸部342提供一定的限位作用，在凸部342有部分位于第一通孔313a内的情况下，第一通孔313a与第二通孔36a共同为凸部342提供限位作用，限制凸部342相对于绝缘件36和第一壁313沿垂直于厚度方向X的位移，尤其是在凸部342与连接部332焊接连接的实施例中，更加便于凸部342与连接部332的连接。
在一些实施例中，沿垂直于厚度方向X的方向，第一连接面332a的尺寸大于第二连接面342a的尺寸。
换言之，沿垂直于厚度方向X的任意一个方向，第一连接面 332a的尺寸均大于第二连接面342a的尺寸，如此，第一连接面332a沿厚度方向X覆盖第二连接面342a设置。示例性地，第一连接面332a和第二连接面342a可以分别呈圆形，第一连接面332a的直径大于第二连接面342a的直径。
如此，便于凸部342与连接部332的连接，在由凸部342背向连接部332的一侧对凸部342和连接部332进行焊接的情况下，连接部332可以为凸部342提供良好的支撑效果，便于焊接工艺的顺利进行。且设置第一连接面332a大于第二连接面342a，有利于提高第一连接面332a和第二连接面342a的连接面积，进而提集流件34和电极端子33的过流能力。
本体部341和第一壁313可以直接连接，或者通过中间连接件连接，具体可以根据实际需要进行选取，这里不做限制。
在一些实施例中，电池单体10还包括密封件35，密封件35环绕连接部332设置，沿第一壁313的厚度方向X，密封件35抵接于座体331和第一壁313之间。
第一壁313靠近密封件35的一侧可以呈平直的表面，或者在第一壁313靠近密封件35的一侧设置凹槽34b，第一通孔313a贯穿凹槽34b底部的一部分，密封件35抵接于凹槽34b的底部。
密封件35环绕在连接部332和第一通孔313a的周侧，以降低容纳腔31a内的电解液通过第一通孔313a溢出到电池单体10的外部的风险。
密封件35可以呈平直的片状，此时，密封件35全部抵接于第一壁313与本体部341之间。或者，密封件35上具有凸起，凸起伸入到第一通孔313a内，并在第一通孔313a内与绝缘件36伸入第二通孔36a内的台阶面抵接，如此，可以进一步提高密封件35的密封性能。
因此，设置密封件35，有利于提高对电池单体10的容纳腔31a的密封性能，降低电解液泄漏而影响电池单体10正常工作的风险，进一步提高电池单体10的安全性能。
如图5、图6和图8所示，在一些实施例中，座体331具有与密封件35抵接的抵接表面，抵接表面到第一连接面332a的距离为s1，抵接 表面到绝缘件36面向容纳腔31a一侧的距离为s，s1/s≤0.7。
抵接表面到绝缘件36面向容纳腔31a一侧的距离，为抵接表面到绝缘件36面向容纳腔31a一侧并围设于第二通孔36a的周侧的部分的距离。可以理解的是，绝缘件36面向容纳腔31a一侧的表面可以呈平面，或者具有台阶，这里的绝缘件36面向容纳腔31a一侧，为绝缘件36位于第二通孔36a附近并被第二通孔36a贯穿的表面。因此，这里的距离s即为第一通孔313a、第二通孔36a以及密封件35压缩后位于座体331和第一壁313之间的部分沿厚度方向X的尺寸之和。
连接部332伸入第一通孔313a以及第二通孔36a内的部分的尺寸越大，则凸部342伸入第一通孔313a或者第二通孔36a内的部分的尺寸越小，反之，连接部332伸入第一通孔313a或第二通孔36a内的部分的尺寸越小，则凸部342伸入第一通孔313a或者第一通孔313a部分的尺寸越大，而凸部342伸入第一通孔313a或者第二通孔36a部分的尺寸越大，越有利于对凸部342进行定位。
发明人在经过深入的研究和大量的实验之后发现，设置s1/s≤0.7，有利于保证凸部342伸入第一通孔313a或者第二通孔36a部分的尺寸大小足够对凸部342进行定位，进一步提高凸部342和连接部332连接的稳定性和便利性。
在一些实施例中，连接部332的周侧表面和座体331面向第一壁313的表面通过弧形面连接。
可选地，弧形面可以是圆弧形表面、椭圆弧形表面或者其它不规则的弧形表面。设置连接部332的周侧表面与座体331面向第一壁313的表面通过弧形面连接。即设置二者通过弧形面过渡连接。
连接部332和座体331在加工的过程中，连接部332可以通过冲压成型的工艺加工成型，在冲压的过程中，设置连接部332的周侧表面与座体331面向第一壁313的表面通过弧形面连接，在冲压的过程中，有利于降低在连接部332的周侧表面与座体331面向第一壁313的表面的相交处产生金属丝的风险，有利于提高电极端子33成品良率。
在一些实施例中，弧形面的曲率半径R满足：R≥0.5mm。
如此设置，有利于进一步提高连接部332的周侧表面与座体331面向第一壁313的表面连接处过渡的平顺性，进一步降低连接部332在冲压成型的过程中产生金属丝的风险，进一步提高电极端子33的成品良率。
在一些实施例中，沿垂直于第一壁313厚度方向X的方向，密封件35和连接部332间具有间隙，沿第一壁313的厚度方向X，弧形面的投影和密封件35的投影不重叠。
密封件35与连接部332具有间隙，则密封件35可以和弧形面错开设置，沿厚度方向X，弧形面的投影和密封件35的投影不重叠，则二者沿厚度方向X的投影交错排布。如此，在电极端子33与密封件35密封连接时，弧形面不会抵压到密封件35，使得密封件35和抵接表面呈平面接触，密封件35的受力方向一致，降低密封件35因与弧形面配合而发生翘起，进而导致有效密封面积过小、密封失效的风险。如图5、图6和图9所示，在一些实施例中，连接部332包括相互连接的第一子部3321和第二子部3322，第二子部3322位于第一子部3321面向容纳腔31a的一侧，第一子部3321与座体331连接，第二子部3322与凸部342连接。
第一子部3321和第二子部3322可以同材料设置，或者，第一子部3321和第二子部3322分别采用不同的材料加工成型。具体可以根据实际情况进行设置，这里不做限定。
第一子部3321和座体331连接，则第一子部3321和座体331可以一体加工成型，或者二者分别加工成型后，再连接在一起。
第二子部3322与凸部342连接，凸部342为集流件34的一部分，集流件34的本体部341又会与电极组件32的极耳321连接，可以根据极耳321的材料设置集流件34和第二子部3322的具体材料。示例性地，极耳321为铝材的情况下，设置集流件34和第二子部3322的材料包括铝。极耳321的材料包括铜的情况下，可以设置第二子部3322和集流件34的材料包括铜，而第一子部3321的材料可以不必是铜。
因此，设置连接部332包括相互连接的第一子部3321和第二子部3322，便于根据实际情况，在实现各部分之间的连接的前提下，合理设 置第一子部3321和第二子部3322的具体材料，以降低生产成本，并提高相关结构的连接可靠性。
在一些实施例中，第一子部3321的材料包括铝。
铝的质量较轻，且价格较低，设置第一子部3321的材料包括铝，有利于降低电极端子33的质量和生产成本，且座体331的材料可以包括铝，并设置第一子部3321和座体331一体成型，以降低加工难度。
由于电极组件32的极耳321的材料可以包括铜或者铝，在极耳321的材料包括铝的实施例中，可以设置集流件34和第二子部3322的材料均为铝，以提高极耳321、集流件34以及第二子部3322的连接强度。
在一些实施例中，第二子部3322的材料包括铜，集流件34的材料包括铜。
在极耳321的材料包括铜的实施例中，设置第二子部3322和集流件34的材料均包括铜，有利于提高第二子部3322、集流件34和极耳321的连接强度，尤其是在焊接连接的过程中，有利于提高极耳321、集流件34以及第二子部3322的焊接强度。且此时第一子部3321的材料可以是铝，不必设置连接部332的材料均为铜，以降低铜的用量，进而降低电极端子33的重量和生产成本。
在一些实施例中，第二子部3322沿第一壁313的厚度方向X的尺寸b满足：b≥0.8mm。
第二子部3322和凸部342的材料均包括铜，发明人经过深入的研究和大量的实验后发现，在第二子部3322和凸部342焊接连接的情况下，设置第二子部3322沿厚度方向X的尺寸b满足上述关系，有利于提高第二子部3322与凸部342焊接连接的可靠性，即有利于提高连接部332和凸部342的连接强度。
在一些实施例中，如图5、图6和图10所示，第二子部3322设于第一子部3321的周侧以及第一子部3321朝向凸部342的一侧。座体331包括相互连接的第三子部3311和第四子部3312，第四子部3312环绕第二子部3322并设于第三子部3311朝向第一壁313的一侧，密封件35抵接于第一壁313与第四子部3312之间。第四子部3312连接于第二子部 3322的周侧表面。
第三子部3311和第四子部3312可以分别成型设置，也可以二者一体成型设置。
第二子部3322设于第一子部3321的周侧以及第一子部3321朝向凸部342的一侧，则第二子部3322覆盖第一子部3321设置，第一子部3321没有任何部分裸露于外部，进而不会与电池单体10内的电解液接触，有利于降低电解液腐蚀第一子部3321的风险。
第四子部3312连接于第二子部3322的周侧表面，则可以设置第四子部3312和第二子部3322分别加工成型后，再通过焊接、铆接等方式连接在一起，或者设置第四子部3312和第二子部3322一体加工成型，具体可以根据实际需求进行选取。
第四子部3312设于第二子部3322的周侧表面，则第二子部3322与第一子部3321的交界面没有暴露在电解液中，如此，不容易对第二子部3322和第一子部3321的界面造成腐蚀。而第四子部3312与第三子部3311的截面位于密封件35的外侧，不易接触电解液，也就不容易在第三子部3311和第四子部3312的界面处发生腐蚀。
可选地，可以设置第二子部3322、第一子部3321以及第三子部3311一体三者一体加工成型，如图10所示，如此，也可以降低电解液腐蚀不同材料连接界面的可能性。
如图10所示，在一些实施例中，第二子部3322与第四子部3312一体成型设置。
第二子部3322和第四子部3312一体成型设置，则可以设置二者的毛坯件为平板状，并通过冲压等工艺一体形成第二子部3322和第四子部3312。如此，第二子部3322和第四子部3312的材料可以相同，而第二子部3322和第四子部3312的材料可以相同，由于密封件35抵接于第四子部3312与第一壁313之间，第二子部3322与第四子部3312分别与第一子部3321和第三子部3311的复合界面位于密封件35远离电解液的一侧，即位于密封件35的密封界面的外侧，换言之，第二子部3322和第四子部3312所采用的材料和第一子部3321和第三子部3311的复合界面与电解液 被密封件35隔绝，复合界面处不容易发生腐蚀，有利于进一步提高电极端子33的结构稳定性。
在一些实施例中，第一子部3321与第三子部3311一体成型设置。
如此，第一子部3321和第三子部3311可以采用同种材料通过冲压工艺成型，简化电极端子33的结构复杂程度，提高电极端子33的加工效率。
在一些实施例中，沿垂直于第一壁313的厚度方向X的方向，第四子部3312端面位于密封件35周侧表面背向连接部332的侧部。
也就是说，第四子部3312沿垂直于厚度方向X的方向延伸，并超出密封件35周侧表面。如此，第四子部3312的端面位于密封件35的密封界面的外侧，进一步降低第四子部3312和第三子部3311的复合界面被电解液腐蚀的可能性。
在一些实施例中，如图5、图6和图11所示，连接部332可以一体成型且铜材料设置，示例性地，连接部332的材料均为铝，如此，有利于提高连接部332的可加工性，提高连接部332的加工效率。
在一些实施例中，本申请实施例提供的电池单体10包括电极端子33、外壳31、集流件34、绝缘件36和密封件35。外壳31具有第一壁313和容纳腔31a，第一壁313具有连通容纳腔31a和外壳31外部的第一通孔313a，电极端子33包括座体331和连接于座体331的连接部332，连接部332的至少部分位于第一通孔313a内。绝缘件36设于第一壁313面向容纳腔31a的一侧，绝缘件36具有第二通孔36a，第二通孔313a与第一通孔313a均呈圆柱形，且第二通孔36a和第一通孔313a的轴线重合。绝缘件36的具有伸入到第二通孔36a和第一通孔313a内的部分，并在第一通孔36a或者第二通孔36a内形呈台阶面，密封件35呈环形，且具有伸入第一通孔313a内的凸起，密封件35的一部分夹设于电极端子33的座体331和第一壁313之间，密封件35的凸起伸入第一通孔313a内，并抵接于绝缘件36的位于第一通孔36a或者第二通孔36a内的台阶面。集流件34包括本体部341和连接于本体部341的凸部342，凸部342通过冲压工 艺加工成型，凸部342凸出本体部341的高度h满足：0＜h≤3mm，以使凸部342的壁厚δ1和本体部341的壁厚δ的关系满足：0.8≤δ1/δ＜1。电极端子33的连接部332与集流件34的凸部342的连接面位于第一通孔313a内或者位于第二通孔36a内，即凸部342至少部分位于第二通孔36a内，以在凸部342与连接部332连接的过程起到限位作用。连接部332包括第一子部3321和第二子部3322，第二子部3322位于第一子部3321面向容纳腔31a的一侧，第一子部3321与座体331连接，第二子部3322与凸部342连接。座体331包括相互连接的第三子部3311和第四子部3312，第四子部3312环绕第二子部3322并设于第三子部3311朝向第一壁313的一侧，密封件35的至少部分抵接于第一壁313与第四子部3312之间。第一子部3321和第三子部3311一体成型设置，第二子部3322和第四子部3312一体成型设置，且通过冲压工艺成型设置。第一子部3321和第三子部3311的材料包括铝，第二子部3322、第四子部3312和凸部342的材料包括铜，如此，在降低电极端子33的加工难度的同时，可以降低电极端子33的铜的用量，并保证电极端子33与凸部342等结构的连接可靠性。
本申请实施例提供的电池单体10，能够降低设置电极端子33的连接部332的至少部分位于第一通孔313a内，并设置凸部342伸入第二通孔36a内，有利于降低凸部342的伸入第二通孔36a的尺寸，提高凸部342的结构强度，进而提高集流件34的工作可靠性，如此有利于提高电池单体10的安全性能。另外，如图10所示，由于铜和铝的复合界面位于密封件35与第一壁313和座体331的复合界面背向电解液的一侧，即铜和铝的复合界面与电池单体内部的电解液被密封件35形成的密封界面隔绝，有利于降低电解液对铜和铝的腐蚀，进而提高电极端子33的结构稳定性。
根据本申请实施例提供的电池10，包括上述任意一实施例提供的电池单体10。
本申请实施例提供的电池10，由于采用了上述任一实施例提供的电池单体10，因而具有同样的技术效果，在此不再赘述。
根据本申请实施例提供的用电装置，包括上述实施例提供的电池10，电池10用于提供电能。
本申请实施例提供的用电装置，由于采用了本申请实施例提供的电池10，因而具有同样的技术效果，在此不再赘述。
虽然已经参考优选实施例对本申请进行了描述，但在不脱离本申请的范围的情况下，可以对其进行各种改进并且可以用等效物替换其中的部件，尤其是，只要不存在结构冲突，各个实施例中所提到的各项技术特征均可以任意方式组合起来。本申请并不局限于文中公开的特定实施例，而是包括落入权利要求的范围内的所有技术方案。

Claims (20)

  1. 一种电池单体，其特征在于，包括：
    外壳，具有第一壁和容纳腔，所述第一壁具有连通所述容纳腔和所述外壳外部的第一通孔；
    电极端子，具有座体和连接于所述座体的连接部，所述座体位于所述第一壁背向所述容纳腔的一侧，所述连接部的至少部分位于所述第一通孔内；
    集流件，包括本体部和连接于所述本体部的凸部，所述凸部朝向所述第一壁的方向凸出设置，所述凸部用于连接所述连接部。
  2. 根据权利要求1所述的电池单体，其特征在于，所述集流件背向所述第一壁的一侧具有凹槽，沿所述第一壁的厚度方向，所述凹槽与所述凸部对应设置。
  3. 根据权利要求2所述的电池单体，其特征在于，所述凸部的最小壁厚为δ1，所述本体部的壁厚为δ，0.8≤δ1/δ＜1。
  4. 根据权利要求1至3任一项所述的电池单体，其特征在于，所述凸部凸出所述本体部的高度h满足：0＜h≤3mm。
  5. 根据权利要求1至4任一项所述的电池单体，其特征在于，所述电池单体还包括绝缘件，所述绝缘件设于所述第一壁面向所述容纳腔的一侧，所述绝缘件具有第二通孔，沿所述第一壁的厚度方向，所述第二通孔与所述第一通孔相对设置；
    所述连接部具有面向所述容纳腔的第一连接面，所述凸部具有第二连接面，所述第一连接面与所述第二连接面相抵，所述第一连接面和第二连接面位于所述第一通孔内，和/或，所述第一连接面和第二连接面位于所述第二通孔内。
  6. 根据权利要求5所述的电池单体，其特征在于，沿垂直于所述厚度方向的方向，所述第一连接面的尺寸大于所述第二连接面的尺寸。
  7. 根据权利要求5或6所述的电池单体，其特征在于，所述电池单体还包括密封件，所述密封件环绕所述连接部设置，沿所述第一壁的厚度方 向，所述密封件至少部分抵接于所述座体和所述第一壁之间。
  8. 根据权利要求7所述的电池单体，其特征在于，所述座体具有与所述密封件抵接的抵接表面，所述抵接表面到所述第一连接面的距离为s1，所述抵接表面到所述绝缘件面向所述容纳腔一侧的距离为s，s1/s≤0.7。
  9. 根据权利要求7或8所述的电池单体，其特征在于，所述连接部的周侧表面和所述座体面向所述第一壁的表面通过弧形面连接。
  10. 根据权利要求9所述的电池单体，其特征在于，所述弧形面的曲率半径R满足：R≥0.5mm。
  11. 根据权利要求9或10所述的电池单体，其特征在于，沿垂直于所述第一壁厚度方向的方向，所述密封件和所述连接部间具有间隙，沿所述第一壁的厚度方向，所述弧形面的投影和所述密封件的投影不重叠。
  12. 根据权利要求7至11任一项所述的电池单体，其特征在于，所述连接部包括相互连接的第一子部和第二子部，所述第二子部位于所述第一子部面向所述容纳腔的一侧，所述第一子部与所述座体连接，所述第二子部与所述凸部连接。
  13. 根据权利要求12所述的电池单体，其特征在于，所述第一子部的材料包括铝。
  14. 根据权利要求12或13所述的电池单体，其特征在于，所述第二子部的材料包括铜，所述集流件的材料包括铜。
  15. 根据权利要求14所述的电池单体，其特征在于，所述第二子部沿所述第一壁的厚度方向尺寸b满足：b≥0.8mm。
  16. 根据权利要求12至15任一项所述的电池单体，其特征在于，所述第二子部设于所述第一子部的周侧以及所述第一子部朝向所述凸部的一侧；所述座体包括相互连接的第三子部和第四子部，所述第四子部环绕所述第二子部并设于所述第三子部朝向所述第一壁的一侧，所述密封件抵接于所述第一壁与所述第四子部之间；
    所述第四子部连接于所述第二子部的周侧表面。
  17. 根据权利要求16所述的电池单体，其特征在于，所述第二子部与所述第四子部一体成型设置；和/或，
    所述第一子部与所述第三子部一体成型设置。
  18. 根据权利要求16或17所述的电池单体，其特征在于，沿垂直于所述第一壁的厚度方向的方向，所述第四子部的端面位于所述密封件周侧表面背向所述连接部的侧部。
  19. 一种电池，其特征在于，包括如权利要求1至18任一项所述的电池单体。
  20. 一种用电装置，其特征在于，包括如权利要求19所述的电池，所述电池用于提供电能。
PCT/CN2023/076799 2022-09-28 2023-02-17 电池单体、电池以及用电装置 WO2024066169A1 (zh)

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