WO2023143059A1 - 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

Info

Publication number
WO2023143059A1
WO2023143059A1 PCT/CN2023/071619 CN2023071619W WO2023143059A1 WO 2023143059 A1 WO2023143059 A1 WO 2023143059A1 CN 2023071619 W CN2023071619 W CN 2023071619W WO 2023143059 A1 WO2023143059 A1 WO 2023143059A1
Authority
WO
WIPO (PCT)
Prior art keywords
battery cell
end cover
annular protrusion
housing
battery
Prior art date
Application number
PCT/CN2023/071619
Other languages
English (en)
French (fr)
Inventor
黄权壮
程启
林江
林传冬
王伟伟
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 EP23745942.5A priority Critical patent/EP4425654A1/en
Publication of WO2023143059A1 publication Critical patent/WO2023143059A1/zh
Priority to US18/651,636 priority patent/US20240283062A1/en

Links

Images

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
    • H01M50/147—Lids or covers
    • H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
    • H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
    • 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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • H01M50/148—Lids or covers characterised by their shape
    • 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
    • H01M50/547—Terminals characterised by the disposition of the terminals on the 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
    • H01M50/147—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
    • 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
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • 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
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch 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 technical field of batteries, in particular to a battery cell, a battery and an electrical device.
  • the cruising range of electric vehicles is an important factor affecting its development.
  • the energy density of batteries needs to be increased.
  • the present application provides a battery cell, a battery and an electrical device to increase the energy density of the battery.
  • the first aspect of the present application provides a battery cell, including a casing and an end cap assembly, the casing has an opening, the end cap assembly includes an end cap, an insulator and an inner pole, the end cap is arranged at the opening and the end cap is close to the case
  • the surface of the body is provided with an annular protrusion extending along its circumference, and the annular protrusion is retracted inwardly relative to the edge of the end cover, so that a flange edge is formed between the outer side of the annular protrusion and the edge of the end cover.
  • the flange is arranged on the shell wall of the casing, and the annular protrusion protrudes into the inside of the casing, the insulating part is arranged in the groove formed by the annular protrusion, and the inner pole is arranged on the insulating part.
  • the battery cell is provided with an annular protrusion on the inner surface of the end cap to form a groove to avoid occupying the space of the cavity, thereby increasing the energy density of the battery cell.
  • the flange edge in the thickness direction of the end cap, includes a fusion zone close to the shell and a non-melt zone away from the shell, and the fusion zone is connected to the shell by laser welding.
  • the part of the flange edge away from the housing forms a non-melting zone, which increases the distance between the laser welding equipment and the pole, thereby avoiding damage to the pole during welding.
  • the thickness of the fused zone is less than the thickness of the non-melted zone.
  • the thickness of the non-melting zone is set larger to better avoid damage to the pole during welding.
  • the thickness of the melting zone ranges from 0.1 mm to 0.5 mm, and the thickness of the non-melting zone ranges from 0.5 mm to 3.5 mm. Such an arrangement can avoid damage to the pole by laser welding while ensuring the connection strength between the end cover 221 and the casing.
  • the outer wall of the annular protrusion is at least partially attached to the inner wall of the casing.
  • the outer wall of the annular protrusion is at least partially attached to the inner wall of the casing to improve the sealing performance of the inner cavity of the battery cell.
  • the outer wall of the annular protrusion and the inner wall of the housing are arranged in close contact to prevent laser light from entering the interior of the housing through the gap between the annular protrusion and the housing and causing damage to the electrode assembly.
  • the outer wall of the annular protrusion in the thickness direction of the end cap, includes a first segment and a second segment, the first segment is arranged in close contact with the inner wall of the housing, and the second segment is relative to the housing
  • the inner wall of the body is inclined to the inside.
  • the first section includes a welding zone close to the flange and a buffer zone away from the flange, and the welding zone is connected to the housing by laser welding.
  • the laser can consume its energy when passing through the gap of the buffer zone, thereby avoiding damage to the internal electrode assembly.
  • the thickness of the weld zone is less than the thickness of the buffer zone. Setting the thickness of the buffer zone to be larger can further prevent laser light from entering the inner cavity and causing damage to the inner electrode assembly.
  • the thickness of the welding zone ranges from 0.1mm to 1.5mm, and the thickness of the buffer zone ranges from 1.5mm to 3.5mm.
  • Such arrangement can prevent the thickness of the annular protrusion from occupying too much space in the inner cavity on the basis of preventing the laser from entering the inner cavity and causing damage to the electrode assembly.
  • the battery cell further includes an electrode assembly disposed in the casing, the electrode assembly includes a main body and tabs protruding from the main body, and the insulator includes a first receiving groove recessed toward a side away from the electrode assembly , the tab is disposed in the first receiving groove and is electrically connected to the inner pole.
  • the insulator further includes a second accommodating groove, the second accommodating groove is disposed on the bottom surface of the first accommodating groove, and is recessed toward a side away from the electrode assembly, and the inner pole is disposed in the second accommodating groove.
  • the insulator is provided with a first accommodating groove for accommodating the tab, which can avoid the space occupied by the connection between the tab and the inner pole, and further improve the energy density of the battery cell.
  • the housing includes two opposite openings
  • the battery cell includes two end cap assemblies corresponding to the two openings.
  • Two outer poles are respectively arranged on the two end cap assemblies. This facilitates interconnection of multiple battery cells.
  • a second aspect of the present application provides a battery, including the battery cell described above.
  • the third aspect of the present application provides an electrical device, comprising the above-mentioned battery cell or battery, for providing electrical energy.
  • Figure 1 is a schematic structural view of a vehicle in some embodiments of the present application.
  • Fig. 2 is a schematic diagram of an exploded structure of a battery in some embodiments of the present application.
  • FIG. 3 is a schematic diagram of a three-dimensional structure of a battery cell in some embodiments of the present application.
  • Fig. 4 is a schematic diagram of an exploded structure of an end cap assembly of a battery cell according to some embodiments of the present application.
  • Figure 5 is a front view of an end cap assembly of some embodiments of the present application.
  • Fig. 6 is a sectional view of the A-A direction of the end cap assembly shown in Fig. 5;
  • Fig. 7 is a partially enlarged structural schematic diagram of part M in Fig. 6;
  • Figure 8 is a side view of an end cap assembly of some embodiments of the present application.
  • FIG. 9 is a front view of a battery cell in some embodiments of the present application.
  • Fig. 10 is a cross-sectional view of the B-B direction of the battery cell shown in Fig. 9;
  • Fig. 11 is a schematic diagram of a partially enlarged structure of part N in Fig. 10;
  • Fig. 12 is a welding schematic diagram of the end cap assembly shown in Fig. 11;
  • Fig. 13 is a schematic structural view of some embodiments of electrode assemblies in a battery cell.
  • the term “multiple” refers to more than two (including two), similarly,
  • Multiple groups means more than two groups (including two groups), and “multiple pieces” means more than two pieces (including two pieces).
  • Current battery cells generally include a case, an end cap, and an electrode assembly accommodated in the case.
  • the end cap is arranged at the opening of the casing so that the end cap and the casing together form a closed cavity, so that the electrode assembly is sealed and placed in the cavity.
  • the inner surface of the end cap includes a protrusion in the thickness direction, and when the end cap is installed at the opening of the housing, the protrusion protrudes into the housing and occupies part of the cavity The space loses the energy density of the battery cell.
  • the inventors of the present application propose to provide grooves on the inner surface of the end cap to avoid occupying the space of the cavity, thereby increasing the energy density of the battery cells.
  • the battery cells disclosed in the embodiments of the present application can be used, but not limited to, in electric devices such as vehicles, ships or aircrafts.
  • a power supply system comprising the electric device can be composed of the battery cells and batteries disclosed in this application.
  • the embodiment of the present application provides an electric device using a battery cell and/or a battery as a power source.
  • the electric device can be, but not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric car, a ship, Spacecraft and more.
  • electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric boat toys, electric airplane toys, etc.
  • spacecraft may include airplanes, rockets, space shuttles, spaceships, etc.
  • a vehicle 1000 as an electric device according to an embodiment of the present application is taken as an example for description.
  • FIG. 1 is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application.
  • the vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle.
  • the interior of the vehicle 1000 is provided with a battery 100 , and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000 .
  • the battery 100 can be used for power supply of the vehicle 1000 , for example, the battery 100 can be used as an operating power source of the vehicle 1000 .
  • the vehicle 1000 may further include a controller 200 and a motor 300 , the controller 200 is used to control the battery 100 to supply power to the motor 300 , for example, for starting, navigating, or working power requirements of the vehicle 1000 during driving.
  • the battery 100 can not only be used as an operating power source for the vehicle 1000 , but can also be used as a driving power source for the vehicle 1000 , replacing or partially replacing fuel oil or natural gas to provide driving power for the vehicle 1000 .
  • FIG. 2 is an exploded view of a battery 100 provided by some embodiments of the present application.
  • the battery 100 includes a case 10 and battery cells 20 .
  • the battery cells 20 are accommodated in the case 10 .
  • the box body 10 is used to provide accommodating space for the battery cells 20 , and the box body 10 may adopt various structures.
  • the box body 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, the first part 11 and the second part 12 jointly define a of accommodation space.
  • the second part 12 can be a hollow structure with one end open, the first part 11 can be a plate-shaped structure, and the first part 11 covers the opening side of the second part 12, so that the first part 11 and the second part 12 jointly define an accommodation space .
  • the first part 11 and the second part 12 can also be hollow structures with one side opening, and the opening side of the first part 11 covers the opening side of the second part 12.
  • the box body 10 formed by the first part 11 and the second part 12 can be in various shapes, such as a cylinder, a cuboid and the like.
  • 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 parallel.
  • the mixed connection means that the multiple battery cells 20 are connected in series and in parallel.
  • a plurality of battery cells 20 can be directly connected in series, in parallel or mixed together, and then the whole composed of a plurality of battery cells 20 is housed in the box 10; of course, the battery 100 can also be a plurality of battery cells 20
  • the battery modules are firstly connected in series or parallel or in combination, and then multiple battery modules are connected in series or in parallel or in combination to form a whole, which is accommodated in the case 10 .
  • the battery 100 may also include other structures, for example, the battery 100 may also include a bus component for realizing electrical connection between multiple battery cells 20 .
  • the box body 10 can be a part of the battery 100, and the box body 10 can be detachably installed in the electric device; Space, for example, when the battery cells 20 are used in the vehicle 1000 , the box 10 is a space formed by the vehicle frame for accommodating the 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 not limited thereto.
  • the battery cell 20 may be in the form of a cylinder, a flat body, a cuboid or other shapes.
  • FIG. 3 is a schematic diagram of a three-dimensional structure of a battery cell 20 provided in some embodiments of the present application. As shown in FIG. Component 24 (shown in Figure 13) and other functional components.
  • the electrode assembly 24 is a part where electrochemical reactions occur in the battery cell 20 .
  • the electrode assembly 24 is mainly formed by winding or stacking positive electrode sheets and negative electrode sheets, and a separator is usually provided between the positive electrode sheets and the negative electrode sheets.
  • the part of the positive electrode sheet and the negative electrode sheet with the active material constitutes the main body 241 of the electrode assembly 24 , and the parts of the positive electrode sheet and the negative electrode sheet without the active material respectively constitute the tab 242 .
  • the positive electrode active material and the negative electrode active material react with the electrolyte, and the tab 242 is connected to the pole to form a current loop.
  • the casing 21 is a component that forms the internal environment of the battery cell 20 , and the formed internal environment can be used to accommodate the electrode assembly 24 , electrolyte, and other components.
  • One or more electrode assemblies 24 may be contained within the case 21 .
  • the housing 21 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not particularly limited in this embodiment of the present application.
  • the end cover assembly 22 refers to a component that covers the opening of the casing 21 to isolate the internal environment of the battery cell 20 from the external environment.
  • the shape of the end cap assembly 22 can be adapted to the shape of the housing 21 to fit the housing 21 .
  • the outer pole 23 is disposed on the end cover assembly 22 and connected to the inner pole 223 for electrical connection with the outside.
  • the battery cell 20 includes a case 21 and an end cap assembly 22 .
  • the case 21 has an opening.
  • the end cap assembly 22 includes an end cap 221, an insulator 222 and an inner pole 223.
  • the end cap 221 is disposed at the opening, and an annular protrusion 2211 is disposed on a surface of the end cap 221 close to the housing 21 extending along its circumference.
  • the annular protrusion 2211 is retracted inwardly relative to the edge of the end cap 221 , so that a flange 2212 is formed between the outer side of the annular protrusion 2211 and the edge of the end cap 221 .
  • the flange 2212 is disposed on the shell wall of the shell 21 and the annular protrusion 2211 protrudes into the shell 21 .
  • the insulator 222 is disposed in the groove surrounded by the annular protrusion 2211 .
  • the inner pole 223 is disposed on the insulator 222 .
  • the casing 21 is a square casing.
  • the housing 21 has two openings passing through in the longitudinal direction Y, and the two end cap assemblies 22 are respectively covered and closed at the two openings.
  • the two end cover assemblies 22 are respectively provided with two outer poles 23, and the two outer poles 23 are respectively connected with the two inner poles 223 of the two end cover assemblies 22, and the two inner poles 223 are connected with the electrodes respectively.
  • the positive and negative tabs of assembly 24 are connected.
  • the housing 21 may only have one opening, and the end cover assembly 22 is covered on the opening, and at this time, two outer poles 23 are arranged at intervals on the end cover assembly 22 .
  • the end cover assembly 22 includes an end cover 221 , an insulator 222 and an inner pole 223 .
  • an annular protrusion 2211 extending along the circumferential direction of the end cover 221 is provided on a surface close to the housing 21 .
  • the annular protrusion 2211 is retracted inwardly relative to the edge of the end cap 221 , so that a flange 2212 is formed between the outer side of the annular protrusion 2211 and the edge of the end cap 221 .
  • the annular protrusion 2211 referred to here is retracted inward relative to the edge of the end cover 221 in the circumferential direction.
  • a groove is formed inside the annular protrusion 2211 , and the insulator 222 is disposed in the groove to reduce the space occupied by the end cover assembly 22 .
  • the distance between the bottom surface of the groove formed by the annular protrusion 2211 and the outer surface of the end cover 221 is greater than the distance between the end surface of the flange edge 2212 and the outer surface of the end cover 221 . That is to say, although a groove is formed on the inner surface of the end cover 221 , the bottom surface of the groove is not coplanar with the end surface of the flange 2212 to ensure the strength of the end cover 221 .
  • the shape of the end cap 221 is adapted to the shape of the opening of the housing 21 , and in this embodiment, the opening of the housing 21 is square, so the shape of the end cap 221 is also square.
  • the shape of the corresponding annular protrusion 2211 is also square.
  • the housing 21 is cylindrical, so at this time the end cap 221 is circular, and the annular protrusion 2211 is also circular.
  • the end cap 221 can be made of a material (such as aluminum alloy) with a certain hardness and strength, so that the end cap 221 is not easy to deform when being squeezed and collided, so that the battery cell 20 can have a higher The structural strength and safety performance can also be improved.
  • the end cover 221 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value.
  • the end cover The material of 221 may also be various, for example, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which are not particularly limited in this embodiment of the present application.
  • the insulator 222 can be used to isolate the electrical connection components inside the casing 21 from the end cover 221 to reduce the risk of short circuit.
  • the insulating member may be plastic, rubber or the like.
  • the flange edge 2212 of the end cover 221 abuts against the shell wall of the housing 21, and the annular protrusion 2211 is inserted into the interior of the housing 21, and the flange edge 2212 and the annular protrusion
  • the jacks 2211 are all connected to the housing 21 to realize the connection between the end cover 221 and the housing 21 .
  • the battery cell 20 is provided with an annular protrusion on the inner surface of the end cover 221 to form a groove, so as to reduce the occupation of the inner cavity space of the housing 21 , thereby increasing the energy density of the battery cell 20 .
  • the annular protrusion 2211 can still be connected with the shell wall of the shell 21 to ensure the connection strength between the end cover 221 and the shell 21 .
  • the outer wall of the annular protrusion 2211 is at least partially attached to the inner wall of the housing 21 .
  • the outer wall of the annular protrusion 2211 is at least partially attached to the inner wall of the casing 21 to improve the sealing performance of the inner cavity of the battery cell 20 . Moreover, the outer wall of the annular protrusion 2211 is attached to the inner wall of the housing 21 , so as to prevent the laser from entering the interior of the housing 21 through the gap between the annular protrusion 2211 and the housing 21 and causing damage to the electrode assembly 24 .
  • the outer wall of the annular protrusion 2211 in the thickness direction of the end cover 221, includes a first segment 2211A and a second segment 2211B, the first segment 2211A is arranged in close contact with the inner wall of the housing 21, and the second segment The two segments 2211B are arranged obliquely toward the inner side relative to the inner wall of the casing 21 .
  • the second segment 2211B when assembling the end cover 221 , the second segment 2211B will first enter into the housing 21 , then setting the second segment 2211B to be inclined inward can form a guiding effect on the entry of the end cover 221 into the shell. , to improve the shell entry efficiency.
  • the range of the distance G between the end of the second segment 2211B and the inner wall of the housing 21 is 1 mm ⁇ G1 ⁇ the width P of the annular protrusion 2211 .
  • the battery cell 20 further includes an electrode assembly 24 disposed in the casing 21 .
  • the electrode assembly 24 includes a main body 241 and a tab 242 protruding from the main body 241 .
  • the insulator 222 includes a first accommodating groove 2221 recessed toward a side away from the electrode assembly 24 .
  • the tab 242 is disposed in the first receiving groove 2221 and electrically connected to the inner pole 223 .
  • the insulator 222 is provided with a first receiving groove 2221 for accommodating the tab 242 , which can avoid the space occupied by connecting the tab 242 with the inner pole 223 and further improve the energy density of the battery cell 20 .
  • the insulator 222 further includes a second accommodating groove 2222 disposed on the bottom of the first accommodating groove 2221 and recessed toward a side away from the electrode assembly 24 , and the inner pole 223 is disposed in the second accommodating groove 2222 .
  • the second receiving groove 2222 is recessed toward the side away from the electrode assembly 24 relative to the bottom surface of the first receiving groove 2221 . As shown in FIG. 6 , after the inner pole 223 is placed in the second receiving groove 2222 , the surface of the inner pole 223 is flush with the bottom surface of the first receiving groove 2221 . In this way, the inner pole 223 does not need to occupy too much space.
  • the end cover 221 is provided with a first post hole 2213
  • the insulator 222 is provided with a second post hole 2223 coaxially arranged with the first post hole 2213
  • the inner post 223 sequentially starts from the first post hole 2223.
  • the second pole hole 2223 and the first pole hole 2213 pass through and connect with the outer pole 23 .
  • the pole includes an inner pole 223 and an outer pole 23 .
  • the pole is offset to one side with respect to the center of the battery cell 20 .
  • biasing the pole toward one side is beneficial to disposing other components such as an explosion-proof valve on the end cover 221 .
  • the flange edge 2212 in the thickness direction of the end cover 221 , includes a melting zone T1 close to the shell 21 and a non-melting zone T2 away from the shell 21 , The melting zone T1 is connected to the casing 21 by laser welding.
  • the thickness of the flange 2212 is increased so that the melting zone T1 of the flange 2212 close to the housing 21 is melted under the action of the laser to connect with the housing 21, while the part of the flange 2212 away from the housing 21
  • the non-melting zone T2 is formed, which increases the distance between the laser welding equipment and the pole, thereby avoiding damage to the pole during welding.
  • the thickness of the melting zone T1 is smaller than the thickness of the non-melting zone T2.
  • the thickness of the non-melting zone T2 is set larger to better avoid damage to the pole during welding.
  • the melting zone T1 has a thickness ranging from 0.1 mm to 0.5 mm
  • the non-melting zone T2 has a thickness ranging from 0.5 mm to 3.5 mm.
  • the first part of the annular protrusion 2211 The segment 2211A includes a welding zone H1 close to the flange side 2212 and a buffer zone H2 away from the flange side 2212 , the welding zone H1 is connected to the housing 21 by laser welding.
  • the laser can consume its energy when passing through the gap of the buffer zone H2, thereby avoiding damage to the internal electrode assembly. 24 for damage.
  • such setting increases the thickness of the annular protrusion 2211 , thereby increasing the clamping area during assembly and improving assembly efficiency.
  • the increase of the thickness of the annular protrusion 2211 enables the end of the second segment 2211B close to the first segment 2211A to be further set to one side of the first segment 2211A, thereby increasing the distance between the second segment 2211B and the housing.
  • the area of the gap between the inner walls of 21 further improves the shell entry efficiency.
  • the thickness of the welding zone H1 is smaller than the thickness of the buffer zone H2. Setting the thickness of the buffer zone H2 to be larger can further prevent the laser from entering the inner cavity and causing damage to the inner electrode assembly.
  • the thickness of the welding zone H1 ranges from 0.1 mm to 1.5 mm, and the thickness of the buffer zone H2 ranges from 1.5 mm to 3.5 mm.
  • Such arrangement can prevent the laser light from entering the inner cavity from causing damage to the electrode assembly 24, and prevent the thickness of the annular protrusion 2211 from occupying too much space in the inner cavity.
  • the housing 21 includes two opposite openings, and the battery cell 20 includes two end cover assemblies 22 corresponding to the two openings. Two outer poles 23 are respectively arranged on the two end cover assemblies 22 . This facilitates interconnection of multiple battery cells 20 .
  • the present application provides a battery 100 including the above-mentioned battery cells 20 .
  • the present application also provides an electrical device, comprising the above-mentioned battery cell 20 and/or battery 100, for providing electrical energy.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Sealing Battery Cases Or Jackets (AREA)
  • Battery Mounting, Suspending (AREA)

Abstract

本申请提供一种电池单体、电池以及用电装置。电池单体包括壳体和端盖组件，壳体具有开口，端盖组件包括端盖、绝缘件和内极柱，端盖设置在开口处，且端盖靠近壳体的表面上设置有沿其周向延伸的环形凸起，环形凸起相对于端盖的边缘向内缩入，以使得环形凸起的外侧与端盖的边缘之间形成法兰边，法兰边设置在壳体的壳壁上且环形凸起伸入到壳体内部，绝缘件设置在环形凸起围合形成的凹槽内，内极柱设置在绝缘件上。电池单体在端盖的内表面设置环形凸起以形成凹槽来避免对腔体空间的占用，进而提高电池单体的能量密度。

Description

电池单体、电池以及用电装置
相关申请的横向引用
本申请是以申请号为 202220226628.3，申请日为 2022年1月27日的中国申请为基础，并主张其优先权，该中国申请的公开内容在此作为整体引入本申请中。
技术领域
本申请涉及电池技术领域，特别是涉及一种电池单体、电池以及用电装置。
背景技术
节能减排是汽车产业可持续发展的关键，电动车辆由于其节能环保的优势成为汽车产业可持续发展的重要组成部分。
对于电动车辆而言，电动车辆的续航里程是影响其发展的重要因素。为了提高电动车辆的续航里程，需要提高电池的能量密度。
发明内容
鉴于以上问题，本申请提供一种电池单体、电池以及用电装置，以提高电池的能量密度。
本申请第一方面提供一种电池单体，包括壳体和端盖组件，壳体具有开口，端盖组件包括端盖、绝缘件和内极柱，端盖设置在开口处且端盖靠近壳体的表面上设置有沿其周向延伸的环形凸起，环形凸起相对于端盖的边缘向内缩入，以使得环形凸起的外侧与端盖的边缘之间形成法兰边，法兰边设置在壳体的壳壁上且环形凸起伸入到壳体内部，绝缘件设置在环形凸起围合形成的凹槽内，内极柱设置在绝缘件上。
在本申请得技术方案中，电池单体在端盖的内表面设置环形凸起以形成凹槽来避免对腔体空间的占用，进而提高电池单体的能量密度。
在一些实施例中，在端盖的厚度方向上，法兰边包括靠近壳体的熔融区以及远离壳体的非熔融区，熔融区与壳体通过激光焊接连接。法兰边的远离壳体的部分形成非熔融区，这样增大激光焊接设备与极柱之间的距离，进而避免焊接时对极柱的损伤。
在一些实施例中，熔融区的厚度小于非熔融区的厚度。将非熔融区的厚度设置得较大，以更好地避免焊接时对极柱的损伤。
在一些实施例中，熔融区的厚度范围为0.1mm～0.5mm，非熔融区的厚度范围为0.5mm～3.5mm。如此设置可以在保证端盖221和壳体连接强度得情况下，还能避免激光焊接对极柱的损伤。
在一些实施例中，环形凸起的外壁至少部分与壳体的内壁贴合设置。环形凸起的外壁至少部分与壳体的内壁贴合设置可提高电池单体的内腔的密封性。而且环形凸起的外壁与壳体的内壁贴合设置可避免激光透过环形凸起与壳体之间的间隙进入到壳体内部而对电极组件造成损伤。
在一些实施例中，在端盖的厚度方向上，环形凸起的外壁包括第一分段和第二分段，第一分段与壳体的内壁贴合设置，第二分段相对于壳体的内壁朝内侧倾斜设置。在装配端盖时，第二分段会首先进入到壳体内，那么将第二分段设置为向内侧倾斜可对端盖的入壳形成导向作用，提高入壳效率。
在一些实施例中，第一分段包括靠近法兰边的焊接区以及远离法兰边的缓冲区，焊接区与壳体通过激光焊接连接。这样在利用激光焊接时，激光在通过缓冲区的间隙时可消耗其能量，进而避免对内部的电极组件造成损伤。
在一些实施例中，焊接区的厚度小于缓冲区的厚度。将缓冲区的厚度设置得较大可进一步避免激光进入到内腔而对内部的电极组件形成损伤。
在一些实施例中，焊接区的厚度范围为0.1mm～1.5mm，缓冲区的厚度范围为1.5mm～3.5mm。如此设置以在避免激光进入到内腔而对电极组件造成损伤的基础上还能避免环形凸起的厚度占用太多内腔的空间。
在一些实施例中，电池单体还包括设置在壳体内的电极组件，电极组件包括主体部和从主体部伸出的极耳，绝缘件包括朝远离电极组件一侧凹入的第一容纳槽，极耳设置在第一容纳槽内且与内极柱电连接。
在一些实施例中，绝缘件还包括第二容纳槽，第二容纳槽设置在第一容纳槽的底面，且朝远离电极组件一侧凹入，内极柱设置在第二容纳槽内。在绝缘件上设置用于容纳极耳的第一容纳槽，这样可避免极耳与内极柱连接所占用的空间，进一步提高电池单体的能量密度。
在一些实施例中，壳体包括相对设置的两个开口，电池单体包括与两个开口对应设置的两个端盖组件。两个端盖组件上分别设置有两个外极柱。这样可方便多个电池单体的相互连接。
本申请第二方面提供一种电池，包括上述电池单体。
本申请第三方面提供一种用电装置，包括上述电池单体或电池，用于提供电能。
上述说明仅是本申请技术方案的概述，为了能够更清楚了解本申请的技术手段，而可依照说明书的内容予以实施，并且为了让本申请的上述和其它目的、特征和优点能够更明显易懂，以下特举本申请的具体实施方式。
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是本申请一些实施例的车辆的结构示意图；
图2是本申请一些实施例的电池的分解结构示意图；
图3是本申请一些实施例的一种电池单体的立体结构示意图；
图4是本申请一些实施例的电池单体的端盖组件的分解结构示意图；
图5是本申请一些实施例的端盖组件的主视图；
图6是图5所示的端盖组件的A-A方向的剖视图；
图7是图6中M部分的局部放大结构示意图；
图8是本申请一些实施例的端盖组件的侧视图；
图9是本申请一些实施例的电池单体的主视图；
图10是图9所示的电池单体的B-B方向的剖视图；
图11是图10中N部分的局部放大结构示意图；
图12是图11所示的端盖组件的焊接示意图；
图13是电池单体中电极组件的一些实施例的结构示意图。
在附图中，附图并未按照实际的比例绘制。
标记说明：
1000、车辆；
100、电池；200、控制器；300、马达；
10、箱体；11、第一部分；12、第二部分；
20、电池单体；21、壳体；22、端盖组件；221、端盖；2211、环形凸起；2211A、第一分段；2211B、第二分段；2212、法兰边；2213、第一极柱孔；222、绝缘件；2221、第一容纳槽；2222、第二容纳槽；2223、第二极柱孔；223、内极柱；23、外极柱；24、电极组件；241、主体部；242、极耳。
具体实施方式
除非另有定义，本文所使用的所有的技术和科学术语与属于本申请的技术领域的技术人员通常理解的含义相同；本文中所使用的术语只是为了描述具体的实施例的目的，不是旨在于限制本申请；本申请的说明书和权利要求书及上述附图说明中的术语“包括”和“具有”以及它们的任何变形，意图在于覆盖不排他的包含。
在本申请实施例的描述中，技术术语“第一”“第二”等仅用于区别不同对象，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量、特定顺序或主次关系。在本申请实施例的描述中，“多个”的含义是两个以上，除非另有明确具体的限定。
在本文中提及“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，本文所描述的实施例可以与其它实施例相结合。
在本申请实施例的描述中，术语“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。另外，本文中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请实施例的描述中，术语“多个”指的是两个以上(包括两个)，同理，
“多组”指的是两组以上(包括两组)，“多片”指的是两片以上(包括两片)。
在本申请实施例的描述中，技术术语“中心”“纵向”“横向”“长度”“宽度”“厚度”“上”“下”“前”“后”“左”“右”“竖直”“水平”“顶”“底”“内”“外”“顺时针”“逆时针”“轴向”“径向”“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请实施例和简化描述，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实施例的限制。
在本申请实施例的描述中，除非另有明确的规定和限定，技术术语“安装”“相连”“连接”“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；也可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本申请实施例中的具体含义。
目前的电池单体通常包括壳体、端盖和容纳在壳体内的电极组件。端盖设置在壳体的开口处以使得端盖和壳体共同围合形成封闭的腔体，以将电极组件封闭放置在腔体内。在发明人了解的相关技术中，端盖的内表面包括在厚度方向上的凸出部，当端盖安装在壳体的开口处时，凸出部会伸出到壳体内，占用腔体的部分空间，损失电池单体的能量密度。
为了解决以上问题，本申请的发明人提出在端盖的内表面设置凹槽，以避免对腔体空间的占用，进而提高电池单体的能量密度。
本申请实施例公开的电池单体可以但不限用于车辆、船舶或飞行器等用电装置中。可以使用具备本申请公开的电池单体、电池等组成该用电装置的电源系统。
本申请实施例提供一种使用电池单体和/或电池作为电源的用电装置，用电装置可以为但不限于手机、平板、笔记本电脑、电动玩具、电动工具、电瓶车、电动汽车、轮船、航天器等等。其中，电动玩具可以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，航天器可以包括飞机、火箭、航天飞机和宇宙飞船等等。
以下实施例为了方便说明，以本申请一实施例的一种用电装置为车辆1000为例进行说明。
请参照图1，图1为本申请一些实施例提供的车辆1000的结构示意图。车辆1000可以为燃油汽车、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。车辆1000的内部设置有电池100，电池100可以设置在车辆1000的底部或头部或尾部。电池100可以用于车辆1000的供电，例如，电池100可以作为车辆1000的操作电源。车辆1000还可以包括控制器200和马达300，控制器200用于控制电池100为马达300供电，例如，用于车辆1000的启动、导航或行驶时的工作用电需求。
在本申请一些实施例中，电池100不仅可以作为车辆1000的操作电源，还可以作为车辆1000的驱动电源，代替或部分地代替燃油或天然气为车辆1000提供驱动动力。
请参照图2，图2为本申请一些实施例提供的电池100的爆炸图。电池100包括箱体10和电池单体20。电池单体20容纳于箱体10内。其中，箱体10用于为电池单体20提供容纳空间，箱体10可以采用多种结构。在一些实施例中，箱体10可以包括第一部分11和第二部分12，第一部分11与第二部分12相互盖合，第一部分11和第二部分12共同限定出用于容纳电池单体20的容纳空间。第二部分12可以为一端开口的空心结构，第一部分11可以为板状结构，第一部分11盖合于第二部分12的开口侧，以使第一部分11和第二部分12共同限定出容纳空间。第一部分11和第二部分12也可以是均为一侧开口的 空心结构，第一部分11的开口侧盖合于第二部分12的开口侧。当然，第一部分11和第二部分12形成的箱体10可以是多种形状，比如，圆柱体、长方体等。
在电池100中，电池单体20可以是多个，多个电池单体20之间可串联或并联或混联，混联是指多个电池单体20中既有串联又有并联。多个电池单体20之间可直接串联或并联或混联在一起，再将多个电池单体20构成的整体容纳于箱体10内；当然，电池100也可以是多个电池单体20先串联或并联或混联组成电池模块形式，多个电池模块再串联或并联或混联形成一个整体，并容纳于箱体10内。电池100还可以包括其他结构，例如，该电池100还可以包括汇流部件，用于实现多个电池单体20之间的电连接。
其中，箱体10既可以是电池100的一部分，箱体10可拆卸地安装于用电装置；或者，箱体10也可以是用电装置中的结构件形成的用于容纳电池单体20的空间，例如，电池单体20用于车辆1000时，箱体10为车架形成的用于容纳电池单体20的空间。
其中，每个电池单体20可以为二次电池或一次电池；还可以是锂硫电池、钠离子电池或镁离子电池，但不局限于此。电池单体20可呈圆柱体、扁平体、长方体或其它形状等。
请参照图3，图3为本申请一些实施例提供的电池单体20的立体结构示意图，如图3所示，电池单体20包括壳体21、端盖组件22、外极柱23、电极组件24(如图13所示)及其他的功能性部件。
电极组件24是电池单体20中发生电化学反应的部件。电极组件24主要由正极片和负极片卷绕或层叠放置形成，并且通常在正极片与负极片之间设有隔膜。正极片和负极片具有活性物质的部分构成电极组件24的主体部241，正极片和负极片不具有活性物质的部分各自构成极耳242。在电池100的充放电过程中，正极活性物质和负极活性物质与电解液发生反应，极耳242与极柱连接以形成电流回路。
壳体21是形成电池单体20的内部环境的组件，形成的内部环境可以用于容纳电极组件24、电解液以及其他部件。壳体21内可以包含一个或更多个电极组件24。壳体21的材质可以是多种，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。
端盖组件22是指盖合于壳体21的开口处以将电池单体20的内部环境隔绝于外部环境的部件。不限地，端盖组件22的形状可以与壳体21的形状相适应以配合壳体21。
如图4所示，外极柱23设置在端盖组件22上并与内极柱223连接以与外部进行电连接。
参考图3至图8，电池单体20包括壳体21和端盖组件22。壳体21具有开口。端 盖组件22包括端盖221、绝缘件222和内极柱223。端盖221设置在开口处且端盖221的靠近壳体21的表面上设置有沿其周向延伸的环形凸起2211。环形凸起2211相对于端盖221的边缘向内缩入，以使得环形凸起2211的外侧与端盖221的边缘之间形成法兰边2212。法兰边2212设置在壳体21的壳壁上且环形凸起2211伸入到壳体21内部。绝缘件222设置在环形凸起2211围合形成的凹槽内。内极柱223设置在绝缘件222上。
如图3所示，壳体21为方形壳体。且壳体21具有在长度方向Y上贯通的两个开口，两个端盖组件22分别盖合在两个开口处。且两个端盖组件22上分别设置有两个外极柱23，两个外极柱23分别与两个端盖组件22的两个内极柱223连接，两个内极柱223分别与电极组件24的正极耳和负极耳连接。在其他附图未示出的实施例中，壳体21还可以仅具有一个开口，端盖组件22盖合在开口处，此时端盖组件22上间隔设置有两个外极柱23。
如图4所示，端盖组件22包括端盖221、绝缘件222和内极柱223。其中，端盖221的靠近壳体21的表面上设置有沿其周向延伸的环形凸起2211。环形凸起2211相对于端盖221的边缘向内缩入，以使得环形凸起2211的外侧与端盖221的边缘之间形成法兰边2212。此处指的环形凸起2211在周向方向上均相对于端盖221的边缘向内缩入。这样环形凸起2211的内部形成凹槽，绝缘件222设置在凹槽内以减少端盖组件22占用的空间。参考图11和图12，环形凸起2211形成的凹槽的底面与端盖221的外表面之间的距离大于法兰边2212的端面与端盖221的外表面之间的距离。也就是说，虽然端盖221的内表面形成凹槽，但是该凹槽的底面与法兰边2212的端面并不是共面的，以保证端盖221的强度。
端盖221的形状是与壳体21的开口的形状适配的，本实施例中壳体21的开口是方形，那么端盖221的形状也是方形的。相应的环形凸起2211的形状也为方形。在其他附图未示出的实施例中，壳体21为圆柱状，那么此时端盖221为圆形，环形凸起2211也为圆形。可选地，端盖221可以由具有一定硬度和强度的材质(如铝合金)制成，这样，端盖221在受挤压碰撞时就不易发生形变，使电池单体20能够具备更高的结构强度，安全性能也可以有所提高，在一些实施例中，端盖221上还可以设置有用于在电池单体20的内部压力或温度达到阈值时泄放内部压力的泄压机构，端盖221的材质也可以是多种的，比如，铜、铁、铝、不锈钢、铝合金、塑胶等，本申请实施例对此不作特殊限制。绝缘件222可以用于隔离壳体21内的电连接部件与端盖221，以降低短路的风险。示例性的，绝缘件可以是塑料、橡胶等。
在装配本申请实施例的电池单体20时，端盖221的法兰边2212抵靠在壳体21的 壳壁上，环形凸起2211申入在壳体21内部，法兰边2212以及环形凸起2211均与壳体21连接以实现端盖221与壳体21之间的连接。本申请实施例电池单体20在端盖221的内表面设置环形凸起以形成凹槽，从而减小对壳体21内部腔体空间的占用，进而提高电池单体20的能量密度。而且环形凸起2211还是能与壳体21的壳壁进行连接以保证端盖221与壳体21之间的连接强度。
在一些实施例中，参考图9至图11，环形凸起2211的外壁至少部分与壳体21的内壁贴合设置。
如图12所示，环形凸起2211的外壁的至少部分与壳体21的内壁贴合设置。在利用激光焊接端盖221与壳体21时，如图12示出的熔融部R，可见环形凸起2211的靠近法兰边221的部分要与壳体21的内壁熔融连接在一起。
环形凸起2211的外壁至少部分与壳体21的内壁贴合设置可提高电池单体20的内腔的密封性。而且环形凸起2211的外壁与壳体21的内壁贴合设置，可避免激光透过环形凸起2211与壳体21之间的间隙进入到壳体21内部而对电极组件24造成损伤。
在一些实施例中，在端盖221的厚度方向上，环形凸起2211的外壁包括第一分段2211A和第二分段2211B，第一分段2211A与壳体21的内壁贴合设置，第二分段2211B相对于壳体21的内壁朝内侧倾斜设置的。
如图11所示，在装配端盖221时，第二分段2211B会首先进入到壳体21内，那么将第二分段2211B设置为向内侧倾斜可对端盖221的入壳形成导向作用，提高入壳效率。具体地，第二分段2211B的端部与壳体21的内壁之间的距离G的范围为1mm≤G1≤环形凸起2211的宽度P。
将第二分段2211B设置为向内侧倾斜可对端盖221的入壳形成导向作用，提高入壳效率。
在一些实施例中，如图13所示，电池单体20还包括设置在壳体21内的电极组件24。电极组件24包括主体部241和从主体部241伸出的极耳242。如图4所示，绝缘件222包括朝远离电极组件24一侧凹入的第一容纳槽2221。极耳242设置在第一容纳槽2221内且与内极柱223电连接。
在绝缘件222上设置用于容纳极耳242的第一容纳槽2221，这样可避免极耳242与内极柱223连接所占用的空间，进一步提高电池单体20的能量密度。
在一些实施例中，绝缘件222还包括设置在第一容纳槽2221底面且朝远离电极组件24一侧凹入的第二容纳槽2222，内极柱223设置在第二容纳槽2222内。
第二容纳槽2222相对于第一容纳槽2221的底面朝远离电极组件24一侧凹入。如 图6所示，在将内极柱223放置在第二容纳槽2222内后，内极柱223的表面与第一容纳槽2221的底面平齐。这样使得内极柱223无需占用过多的空间。
如图4所示，端盖221上设置有第一极柱孔2213，绝缘件222上设置有与第一极柱孔2213同轴设置的第二极柱孔2223，内极柱223依次从第二极柱孔2223和第一极柱孔2213穿出并与外极柱23连接。在本实施例中，极柱包括内极柱223和外极柱23。在高度方向Z上，极柱相对于电池单体20的中心朝一侧偏置。如此设置利于当电极组件24的极耳242从高度方向Z一侧伸出且需要通过转接片与内极柱223进行连接时，可减小转接片的长度。而且将极柱朝一侧偏置，利于在端盖221上设置防爆阀等其他部件。
发明人在研究中发现将极柱偏置，会使得极柱的位置靠近端盖221的边缘，那么在焊接端盖221和壳体21时可能会造成对极柱的损伤。针对此问题，参考图11和图12，在一些实施例中，在端盖221的厚度方向上，法兰边2212包括靠近壳体21的熔融区T1以及远离壳体21的非熔融区T2，熔融区T1与壳体21通过激光焊接连接。也就是说增大法兰边2212的厚度，使得法兰边2212的靠近壳体21的熔融区T1在激光作用下发生熔化以与壳体21连接，而法兰边2212的远离壳体21的部分形成非熔融区T2，这样增大激光焊接设备与极柱之间的距离，进而避免焊接时对极柱的损伤。
在一些实施例中，熔融区T1的厚度小于非熔融区T2的厚度。将非熔融区T2的厚度设置得较大，以更好地避免焊接时对极柱的损伤。
在一些实施例中，熔融区T1的厚度范围为0.1mm～0.5mm，非熔融区T2的厚度范围为0.5mm～3.5mm。在此厚度设置下，在保证端盖221和壳体21连接强度的情况下，还能避免激光焊接对极柱的损伤。
为了避免焊接时的激光通过环形凸起2211与壳体21的内壁之间的间隙进入到壳体21内而对内部的电极组件24形成损伤，在一些实施例中，环形凸起2211的第一分段2211A包括靠近法兰边2212的焊接区H1以及远离法兰边2212的缓冲区H2，焊接区H1与壳体21通过激光焊接连接。如图12所示，这样在利用激光焊接时，即使环形凸起2211与壳体21之间没有完全贴合，激光在通过缓冲区H2的间隙时可消耗其能量，进而避免对内部的电极组件24造成损伤。而且这样设置增大环形凸起2211的厚度，进而增大装配时的夹持面积，提升装配效率。而且环形凸起2211厚度的增大，使得第二分段2211B的靠近第一分段2211A的端部可以进一步向第一分段2211A的一侧设置，进而增大第二分段2211B与壳体21的内壁之间的间隙的面积，进一步提高入壳效率。
在一些实施例中，焊接区H1的厚度小于缓冲区H2的厚度。将缓冲区H2的厚度设置得较大可进一步避免激光进入到内腔而对内部的电极组件形成损伤。
在一些实施例中，焊接区H1的厚度范围为0.1mm～1.5mm，缓冲区H2的厚度范围为1.5mm～3.5mm。如此设置能够避免激光进入到内腔对电极组件24造成损伤，并且避免环形凸起2211的厚度占用太多内腔的空间。
在一些实施例中，壳体21包括相对设置的两个开口，电池单体20包括与两个开口对应设置的两个端盖组件22。两个端盖组件22上分别设置有两个外极柱23。这样可方便多个电池单体20的相互连接。
本申请提供一种电池100，包括上述电池单体20。
本申请还提供一种用电装置，包括上述的电池单体20和/或电池100，用于提供电能。
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 (14)

  1. 一种电池单体(20)，包括：
    壳体(21)，具有开口；和
    端盖组件(22)，包括端盖(221)、绝缘件(222)和内极柱(223)，所述端盖(221)设置在所述开口处，且所述端盖(221)靠近壳体(21)的表面上设置有沿其周向延伸的环形凸起(2211)，所述环形凸起(2211)相对于所述端盖(221)的边缘向内缩入，以使得所述环形凸起(2211)的外侧与所述端盖(221)的边缘之间形成法兰边(2212)，所述法兰边(2212)设置在所述壳体(21)的壳壁上且所述环形凸起(2211)伸入到所述壳体(21)内部，所述绝缘件(222)设置在所述环形凸起(2211)围合形成的凹槽内，所述内极柱(223)设置在所述绝缘件(222)上。
  2. 根据权利要求1所述的电池单体(20)，其中，在所述端盖(221)的厚度方向上，所述法兰边(2212)包括靠近所述壳体(21)的熔融区(T1)以及远离所述壳体(21)的非熔融区(T2)，所述熔融区(T1)与所述壳体(21)通过激光焊接连接。
  3. 根据权利要求2所述的电池单体(20)，其中，所述熔融区(T1)的厚度小于所述非熔融区(T2)的厚度。
  4. 根据权利要求3所述的电池单体(20)，其中，所述熔融区(T1)的厚度范围为0.1mm～0.5mm，所述非熔融区(T2)的厚度范围为0.5mm～3.5mm。
  5. 根据权利要求1至4任一项所述的电池单体(20)，其中，所述环形凸起(2211)的外壁至少部分与所述壳体(21)的内壁贴合设置。
  6. 根据权利要求5所述的电池单体(20)，其中，在所述端盖(221)的厚度方向上，所述环形凸起(2211)的外壁包括第一分段(2211A)和第二分段(2211B)，所述第一分段(2211A)与所述壳体(21)的内壁贴合设置，所述第二分段(2211B)相对于所述壳体(21)的内壁朝内侧倾斜设置。
  7. 根据权利要求6所述的电池单体(20)，其中，所述第一分段(2211A)包括靠近所述法兰边(2212)的焊接区(H1)以及远离所述法兰边(2212)的缓冲区(H2)，所述焊接区(H1)与所述壳体(21)通过激光焊接连接。
  8. 根据权利要求7所述的电池单体(20)，其中，所述焊接区(H1)的厚度小于所述缓冲区(H2)的厚度。
  9. 根据权利要求8所述的电池单体(20)，其中，所述焊接区(H1)的厚度范围为0.1mm～1.5mm，所述缓冲区(H2)的厚度范围为1.5mm～3.5mm。
  10. 根据权利要求1至9中任一项所述的电池单体(20)，还包括设置在所述壳体(21)内的电极组件(24)，所述电极组件(24)包括主体部(241)和从所述主体部(241)伸出的极耳(242)，所述绝缘件(222)包括朝远离所述电极组件(24)一侧凹入的第一容纳槽(2221)，所述极耳(242)设置在所述第一容纳槽(2221)内且与所述内极柱(223)电连接。
  11. 根据权利要求10所述的电池单体，其中，所述绝缘件(222)还包括第二容纳槽(2222)，所述第二容纳槽(2222)设置在所述第一容纳槽(2221)的底面，且朝远离所述电极组件(24)一侧凹入，所述内极柱(223)设置在所述第二容纳槽(2222)内。
  12. 根据权利要求1至11中任一项所述的电池单体(20)，所述壳体(21)包括相对设置的两个所述开口，所述电池单体(20)包括与两个所述开口对应设置的两个端盖组件(22)。
  13. 一种电池(100)，包括：如权利要求1至12中任一项所述的电池单体(20)。
  14. 一种用电装置，包括如权利要求1至12中任一项所述的电池单体(20)和/或权利要求13所述的电池(100)，用于提供电能。
PCT/CN2023/071619 2022-01-27 2023-01-10 电池单体、电池以及用电装置 WO2023143059A1 (zh)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP23745942.5A EP4425654A1 (en) 2022-01-27 2023-01-10 Battery cell, battery and electric device
US18/651,636 US20240283062A1 (en) 2022-01-27 2024-04-30 Battery cell, battery, and power consuming device

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202220226628.3 2022-01-27
CN202220226628.3U CN216750092U (zh) 2022-01-27 2022-01-27 电池单体、电池以及用电装置

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US18/651,636 Continuation US20240283062A1 (en) 2022-01-27 2024-04-30 Battery cell, battery, and power consuming device

Publications (1)

Publication Number Publication Date
WO2023143059A1 true WO2023143059A1 (zh) 2023-08-03

Family

ID=81915619

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2023/071619 WO2023143059A1 (zh) 2022-01-27 2023-01-10 电池单体、电池以及用电装置

Country Status (4)

Country Link
US (1) US20240283062A1 (zh)
EP (1) EP4425654A1 (zh)
CN (1) CN216750092U (zh)
WO (1) WO2023143059A1 (zh)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN216750092U (zh) * 2022-01-27 2022-06-14 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
WO2024152295A1 (zh) * 2023-01-19 2024-07-25 宁德时代新能源科技股份有限公司 电池单体、电池及用电设备

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160149172A1 (en) * 2014-11-26 2016-05-26 Samsung Sdi Co., Ltd. Rechargeable battery
CN112310574A (zh) * 2020-09-30 2021-02-02 宁德时代新能源科技股份有限公司 圆柱型电池单体、电池、用电装置、制造方法及制造系统
CN213401344U (zh) * 2020-08-17 2021-06-08 宁德时代新能源科技股份有限公司 电池单体、电池及用电装置
WO2021200737A1 (ja) * 2020-03-31 2021-10-07 パナソニックＩｐマネジメント株式会社 封口体および電池
CN214898799U (zh) * 2021-06-30 2021-11-26 宁德时代新能源科技股份有限公司 端盖组件、电池及用电装置
CN216750092U (zh) * 2022-01-27 2022-06-14 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 (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160149172A1 (en) * 2014-11-26 2016-05-26 Samsung Sdi Co., Ltd. Rechargeable battery
WO2021200737A1 (ja) * 2020-03-31 2021-10-07 パナソニックＩｐマネジメント株式会社 封口体および電池
CN213401344U (zh) * 2020-08-17 2021-06-08 宁德时代新能源科技股份有限公司 电池单体、电池及用电装置
CN112310574A (zh) * 2020-09-30 2021-02-02 宁德时代新能源科技股份有限公司 圆柱型电池单体、电池、用电装置、制造方法及制造系统
CN214898799U (zh) * 2021-06-30 2021-11-26 宁德时代新能源科技股份有限公司 端盖组件、电池及用电装置
CN216750092U (zh) * 2022-01-27 2022-06-14 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

Also Published As

Publication number Publication date
EP4425654A1 (en) 2024-09-04
CN216750092U (zh) 2022-06-14
US20240283062A1 (en) 2024-08-22

Similar Documents

Publication Publication Date Title
WO2023143059A1 (zh) 电池单体、电池以及用电装置
WO2023137950A1 (zh) 卷绕式电极组件、电池单体、电池及用电设备
CN216055080U (zh) 电池单体、电池以及用电装置
US20240106084A1 (en) Battery cell, battery, power consumption device, and method and device for producing battery cell
CN217239607U (zh) 端盖组件、电池单体、电池及用电装置
WO2023221598A1 (zh) 连接组件、电池单体、电池及用电设备
WO2023142700A1 (zh) 电池顶盖、顶盖组件、电池单体、电池及用电装置
EP4270608A1 (en) Battery cell, battery and electric apparatus
WO2023159507A1 (zh) 绝缘件、端盖组件、电池单体、电池及用电设备
WO2023221267A1 (zh) 端盖组件、电池单体、电池及用电装置
WO2023142894A1 (zh) 电池单体、电池及用电装置
WO2023025104A1 (zh) 电池单体、电池以及用电装置
WO2023131031A1 (zh) 一种电池单体、电池及用电装置
WO2023280232A1 (zh) 电池单体、电池及用电装置
WO2023173429A1 (zh) 电池单体及其制造方法和制造设备、电池、用电设备
CN218385672U (zh) 端盖组件、电池单体、电池及用电设备
CN217740741U (zh) 电池单体、电池及用电设备
WO2023220874A1 (zh) 端盖组件、电池单体、电池以及用电设备
WO2023134318A1 (zh) 一种连接部件、电池单体、电池及用电装置
WO2023097441A1 (zh) 电池单体、电池、用电装置及电池单体的制造方法
WO2023220873A1 (zh) 电池单体的端盖组件、电池单体、电池以及用电设备
WO2023050245A1 (zh) 转接部件、电池单体、电池、用电装置以及电池单体的制造方法和制造设备
WO2024040837A1 (zh) 端盖组件、电池单体、电池及用电装置
WO2023050246A1 (zh) 电池单体、电池、用电装置以及电池单体的制造方法和制造设备
CN220382284U (zh) 用电装置、电池、电池单体及其端盖和盖板组件

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 23745942

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2023745942

Country of ref document: EP

ENP Entry into the national phase

Ref document number: 2023745942

Country of ref document: EP

Effective date: 20240531

NENP Non-entry into the national phase

Ref country code: DE