WO2023065241A1 - 电池单体及其制造方法和制造设备、电池及用电装置 - Google Patents

电池单体及其制造方法和制造设备、电池及用电装置 Download PDF

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Publication number
WO2023065241A1
WO2023065241A1 PCT/CN2021/125398 CN2021125398W WO2023065241A1 WO 2023065241 A1 WO2023065241 A1 WO 2023065241A1 CN 2021125398 W CN2021125398 W CN 2021125398W WO 2023065241 A1 WO2023065241 A1 WO 2023065241A1
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WO
WIPO (PCT)
Prior art keywords
tab
connection part
battery cell
layer
tabs
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Application number
PCT/CN2021/125398
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English (en)
French (fr)
Inventor
杨彦超
喻鸿钢
唐代春
杨晴雅
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2021/125398 priority Critical patent/WO2023065241A1/zh
Priority to CN202180092873.8A priority patent/CN116802917A/zh
Publication of WO2023065241A1 publication Critical patent/WO2023065241A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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 more specifically, to a battery cell, a manufacturing method and equipment thereof, a battery, and an electrical device.
  • Battery cells are widely used in electronic equipment, such as mobile phones, laptop computers, battery cars, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.
  • the battery cells may include nickel-cadmium battery cells, nickel-hydrogen battery cells, lithium-ion battery cells, secondary alkaline zinc-manganese battery cells, and the like.
  • the present application provides a battery cell and its manufacturing method and manufacturing equipment, a battery and an electrical device, which can enhance the safety of the battery cell and the battery.
  • the embodiment of the present application provides a battery cell, including: a housing with a housing cavity; electrode terminals disposed in the housing for extracting electric energy from the battery cell; an electrode assembly accommodated in the housing cavity and arranged There are tabs, the tabs are provided with multiple layers, and each layer of tabs contains at least one tab piece; and a connecting part, used to connect the electrode terminal and the tab, the connecting part includes a multi-layer tab connection part, and the multi-layer tab connection The parts and the multi-layer tabs are alternately stacked.
  • the tab and the electrode terminal are connected by using a connecting member with a multi-layer tab connection part, and the multi-layer tab connection part and the multi-layer tab are alternately stacked and connected, which can increase the Large contact area between connecting parts and tabs improves the connection strength between connecting parts and tabs, effectively solves the problem of tab tearing under high-strength vibration conditions, reduces the risk of tabs being inserted into electrode assemblies due to tearing, and avoids short circuits. Further improve the overall safety of the battery.
  • the number of layers of the tab connection part is one more than the number of layers of the tab, and each layer of tabs is clamped between two layers of tab connection parts.
  • At least one layer of tab includes a plurality of tab pieces, the tab has a first connection portion, and the plurality of tab pieces are connected as a whole through the first connection portion.
  • a plurality of tab pieces connected together can increase the overall thickness of the tab and simplify the overlapping process of the tab connection part and the tab; at the same time, multiple tab pieces are connected to each other, which can increase the thickness of the tab. flow capacity.
  • each layer of tabs includes a plurality of tab pieces, each layer of tabs has a first connection portion, and the first connection portions of each layer of tabs are disposed separately.
  • the multi-layer tab connection part is connected to the multi-layer tab and forms a second connection part, and the multi-layer tab connection part and the multi-layer tab are connected as one at the second connection part; In the thickness direction of , the projection of the first connection part and the projection of the second connection part do not overlap.
  • the first connection part and the second connection part do not overlap in the thickness direction of the tab connection part, so that mutual avoidance of the two connection parts can be realized, heavy welding can be prevented, welding through the tab can be avoided, and safety can be improved.
  • the contact area between the lug and the connecting part of the lug is increased, and the welding strength is improved.
  • the first connecting portion is arranged outside the second connecting portion; or, there are multiple first connecting portions, and the multiple first connecting portions are arranged at intervals along the circumference of the second connecting portion.
  • the first connecting part is surrounded by the second connecting part to realize the maximum contact area between the tab and the connecting part of the tab within the limited connecting area of the tab, improve the welding strength, optimize the welding process at the same time, and facilitate construction.
  • the distance between the first connecting portion and the edge of the corresponding tab is L, and the value of L is 3mm ⁇ L ⁇ 8mm. Limiting the distance between the first connecting portion and the edge of the tab can prevent the tab from being folded on the basis of effectively protecting the tab and preventing the tab from being welded through.
  • the thickness of the tab connection part is greater than the thickness of each layer of tabs. Making the thickness of the tab connection part greater than the thickness of each layer of tabs can effectively protect the tabs and improve welding strength.
  • connection part further includes a terminal connection part, the terminal connection part is used to connect the electrode terminal, and a plurality of tab connection parts are connected to the terminal connection part; the connection part is an integrally formed component; or, a plurality of tab connection parts At least one of the parts is integrally formed with the terminal connection part, and the rest of the plurality of tab connection parts are welded to the terminal connection part.
  • This structure of the connection part can effectively connect the electrode terminal and the tab, and realize a good electrical connection between the tab and the electrode terminal on the basis of ensuring the structural strength of the connection part.
  • a plurality of tab connection parts are connected to the terminal connection part at intervals.
  • an embodiment of the present application provides a battery, including the battery cell provided in any embodiment of the first aspect.
  • an embodiment of the present application provides an electrical device, including the battery cell provided in any embodiment of the first aspect, and the battery cell is used to provide electric energy.
  • an embodiment of the present application provides a method for manufacturing a battery cell, including: providing an electrode assembly, the electrode assembly is provided with tabs, the tabs are provided with multiple layers, and each layer of tabs includes at least one tab sheet; Provide a connection part, the connection part includes a multi-layer tab connection part; alternately stack and connect the multi-layer tab connection part and the multi-layer tab; provide a casing and an electrode terminal arranged on the casing, the casing has a housing cavity; connect the connection part It is connected to the electrode terminal, and the electrode assembly and the connecting part are installed in the containing cavity.
  • the embodiment of the present application provides a battery cell manufacturing equipment, including: a first providing device for providing an electrode assembly, the electrode assembly is provided with tabs, and the tabs are provided with multiple layers, each layer of tabs It includes at least one tab piece; the second providing device is used to provide the connection part, and the connection part includes a multi-layer tab connection part; the first assembly device is used to alternately stack the multi-layer tab connection part and the multi-layer tab and connected; the third providing device is used to provide the shell and the electrode terminal arranged on the shell, and the shell has an accommodating cavity; the second assembling device is used to connect the connecting part to the electrode terminal, and install the electrode assembly and the connecting part in the accommodating cavity.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • Fig. 2 is a schematic explosion diagram of a battery provided by some embodiments of the present application.
  • Fig. 3 is a schematic structural diagram of a battery module of the battery shown in Fig. 2;
  • Fig. 4 is an exploded schematic diagram of a battery cell provided by some embodiments of the present application.
  • Fig. 5 is a schematic structural view of an electrode assembly of a battery cell provided in some embodiments of the present application.
  • Fig. 6 is an enlarged view at J in Fig. 5;
  • Fig. 7 is a schematic structural view of the connecting parts of the battery cells provided by some embodiments of the present application.
  • Fig. 8 is a front view of the connecting parts of the battery cells provided by some embodiments of the present application.
  • Fig. 9 is a schematic diagram of the connection principle between tabs and connecting parts of a battery cell provided in some embodiments of the present application.
  • Fig. 10 is a schematic explosion diagram of a battery cell provided by another embodiment of the present application.
  • Fig. 11 is an exploded schematic diagram of a battery cell provided by some further embodiments of the present application.
  • Fig. 12 is a schematic structural view of the connecting parts of the battery cells shown in Fig. 11;
  • Fig. 13 is a schematic diagram of the connection principle between the tabs of the battery cell and the connecting parts shown in Fig. 11;
  • Fig. 14 is a flowchart of a method for manufacturing a battery cell provided by some embodiments of the present application.
  • Fig. 15 is a schematic block diagram of a manufacturing device for a battery cell provided by some embodiments of the present application.
  • Electrode assembly 31. Tabs; 311. Tabs; 31a, first connecting part; 31b, second connecting part; 4 , connection part; 41, tab connection part; 42, terminal connection part; 421, connection convex part; 5, explosion-proof valve; 10, battery cell; 20, confluence part; 30, battery module; , the first box part; 402, the second box part; 100, the battery; 200, the controller; 300, the motor; 400, the vehicle.
  • connection In the description of this application, it should be noted that, unless otherwise clearly stipulated and limited, the terms “installation”, “connection”, “connection” and “attachment” should be understood in a broad sense, for example, it may be a fixed connection, It can also be detachably connected or integrally connected; it can be directly connected or indirectly connected through an intermediary, and it can be internal communication between two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application according to specific situations.
  • “Plurality” in this application refers to two or more (including two).
  • the 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.
  • the embodiment of the present application does not limit this.
  • the battery cell can be in the form of a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application.
  • the battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.
  • the battery mentioned in this application may include a battery module or a battery pack, and the like.
  • Batteries generally include a case for enclosing one or more battery cells. The box can prevent liquid or other foreign objects from affecting the charging or discharging of the battery cells.
  • the battery cell includes an electrode assembly and an electrolyte, and the electrode assembly includes a positive pole piece, a negative pole piece and a separator.
  • a battery cell works primarily by moving metal ions between the positive and negative pole pieces.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector includes a positive electrode coating area and a positive electrode tab connected to the positive electrode coating area, and the positive electrode coating area It is coated with a positive electrode active material layer, and the positive electrode tab is not coated with a positive electrode active material layer.
  • the material of the positive electrode current collector can be aluminum
  • the positive electrode active material layer includes the positive electrode active material
  • the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate.
  • the negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector;
  • the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, and the negative electrode coating area The negative electrode active material layer is coated, and the negative electrode tab is not coated with the negative electrode active material layer.
  • the material of the negative electrode current collector may be copper, the negative electrode active material layer includes the negative electrode active material, and the negative electrode active material may be carbon or silicon.
  • the material of the spacer can be PP (polypropylene, polypropylene) or PE (polyethylene, polyethylene).
  • the tabs of the battery cells are electrically connected to the electrode terminals through connecting parts, and the connecting parts are generally soft metal sheets.
  • the present application provides a technical solution.
  • the tabs of the battery cells are arranged in multiple layers, and the connection part includes a multi-layer tab connection part, and the multi-layer tabs are connected to the multi-layer tabs.
  • the parts are alternately stacked and connected together, which increases the connection area between the tab and the connecting part, improves the structural strength of the connection, effectively solves the problem of tab tearing under high-strength vibration conditions, and reduces the damage caused by tearing of the tab.
  • the risk of inserting the electrode assembly avoids short circuit, further improves the overall safety of the battery, and ensures the stability of power supply.
  • Electric devices can be vehicles, mobile phones, portable devices, notebook computers, ships, spacecraft, electric toys and electric tools, and so on.
  • Vehicles can be fuel vehicles, gas vehicles or new energy vehicles, and new energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles;
  • spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.;
  • electric toys include fixed Type or mobile electric toys, such as game consoles, electric car toys, electric boat toys and electric airplane toys, etc.;
  • electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, for example, Electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, electric planers, and more.
  • the embodiments of the present application do not impose special limitations on the above-mentioned electrical devices.
  • the electric device is taken as an example for description.
  • Fig. 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.
  • a battery 100 is disposed inside the vehicle 400 , and the battery 100 may be disposed at the bottom, head or tail of the vehicle 400 .
  • the battery 100 can be used for power supply of the vehicle 400 , for example, the battery 100 can be used as an operating power source of the vehicle 400 .
  • the vehicle 400 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 and running the vehicle 400 .
  • the battery 100 can not only be used as an operating power source for the vehicle 400 , but can also be used as a driving power source for the vehicle 400 , replacing or partially replacing fuel oil or natural gas to provide driving power for the vehicle 400 .
  • FIG. 2 is a schematic exploded view of the battery 100 provided by some embodiments of the present application.
  • the battery 100 includes a case body 40 and a battery cell 10 (not shown in FIG. 2 ), and the battery cell 10 is accommodated in the case body 40 .
  • the box body 40 is used for accommodating the battery cells 10 , and the box body 40 may have various structures.
  • the box body 40 may include a first box body part 401 and a second box body part 402, the first box body part 401 and the second box body part 402 cover each other, the first box body part 401 and the second box body part 402
  • the two box parts 402 jointly define an accommodating space for accommodating the battery cells 10 .
  • the second box part 402 can be a hollow structure with an open end, the first box part 401 is a plate-shaped structure, and the first box part 401 covers the opening side of the second box part 402 to form a container with accommodating space.
  • the box body 40; the first box body portion 401 and the second box body portion 402 can also be a hollow structure with one side opening, and the opening side of the first box body portion 401 is covered on the opening side of the second box body portion 402, To form a box body 40 with an accommodation space.
  • the first box body part 401 and the second box body part 402 may be in various shapes, such as a cylinder, a cuboid, and the like.
  • a sealing member may also be provided between the first box body part 401 and the second box body part 402, such as sealant, sealing ring, etc. .
  • the first box part 401 covers the top of the second box part 402
  • the first box part 401 can also be called the upper box cover
  • the second box part 402 can also be called the lower box.
  • the battery 100 there may be one battery cell 10, or there may be a plurality of them. If there are multiple battery cells 10 , the multiple battery cells 10 can be connected in series, in parallel or in parallel.
  • the mixed connection means that the multiple battery cells 10 are both in series and in parallel.
  • a plurality of battery cells 10 can be connected in series, in parallel or mixed together, and then the whole composed of the plurality of battery cells 10 is accommodated in the box 40 .
  • multiple battery cells 10 may also be connected in series, parallel or mixed first to form a battery module 30 , and then multiple battery modules 30 are connected in series, parallel or mixed to form a whole, and accommodated in the box 5 .
  • FIG. 3 is a schematic structural diagram of the battery module shown in FIG. 2 .
  • the multiple battery cells 10 there are multiple battery cells 10 , and the multiple battery cells 10 are connected in series, in parallel, or in parallel to form a battery module 30 .
  • a plurality of battery modules 30 are connected in series, in parallel or in parallel to form a whole, and accommodated in the case 40 .
  • the multiple battery cells 10 in the battery module 30 are electrically connected through the busbar 20 , so as to realize parallel connection, series connection or mixed connection of the multiple battery cells 10 in the battery module 30 .
  • Fig. 4 is a schematic exploded view of a battery cell provided by some embodiments of the present application
  • Fig. 5 is a schematic structural view of an electrode assembly of a battery cell provided by some embodiments of the present application
  • Fig. 6 is an enlarged view of J in Fig. 5 .
  • the battery cell 10 includes a housing 1 and an electrode terminal 2 , the housing 1 has a housing cavity, the electrode terminal 2 is disposed on the housing 1 , and the electrode terminal 2 is used to extract electric energy from the battery cell 10 .
  • the battery cell 10 also includes an electrode assembly 3 and a connecting part 4.
  • the electrode assembly 3 is accommodated in the housing cavity and is provided with tabs 31.
  • the tabs 31 are provided with multiple layers, and each layer of tabs 31 includes at least one tab piece 311;
  • the connecting part 4 is used to connect the electrode terminal 2 and the tab 31 .
  • the connecting part 4 includes a multi-layer tab connection part 41 , and the multi-layer tab connection part 41 and the multi-layer tab 31 are alternately stacked.
  • the tab 31 and the electrode terminal 2 are connected by using the connecting member 4 with the multi-layer tab connection part 41, and the multi-layer tab connection part 41 and the multi-layer tab 31 are alternately stacked Setting and connecting can increase the contact area between the connecting part 4 and the tab 31, greatly improve the connection strength between the connecting part 4 and the tab 31, and effectively solve the problem of disconnection between the tab 31 and the connecting part 4 under high-strength vibration conditions. Further improve the overall safety of the battery.
  • the housing 1 includes a housing 11 and an end cover 12. One end of the housing 11 is closed, and the other end is provided with a housing opening. The end cover 12 is covered on the housing opening. The housing 11 is surrounded to form a housing cavity.
  • the electrode assembly 3 is provided in the holding chamber.
  • the structure of the casing 11 may be a cylinder, a flat body, a cuboid or other shapes, which is not limited in this embodiment of the present application.
  • the electrode terminal 2 is disposed on the end cover 12 , and the electrode terminal 2 protrudes inward into the housing 11 and is electrically connected to the tab 31 .
  • An explosion-proof valve 5 is provided on the end cover 12, and the explosion-proof valve 5 can be opened in time when the battery cell is thermally out of control, and the high-temperature and high-pressure gas in the battery cell can be discharged in time to prevent the battery cell from igniting and exploding.
  • the electrode assembly 3 has two tabs 31, and the two tabs 31 are the protruding parts of the positive pole piece and the negative pole piece respectively, that is, the two pole tabs 31 are the positive pole tab and the negative pole tab respectively.
  • the structures of the two tabs 31 are the same, and the solution of the present application mainly involves the structures of the tabs 31 and the connecting member 4 , so the polarity of the tabs 31 is not distinguished.
  • the two electrode terminals 2 are respectively a positive terminal and a negative terminal, and the two electrode terminals 2 are symmetrically arranged on both sides of the end cap 12 .
  • One connecting part 4 is connected between the positive tab and the positive terminal, and the other connecting part 4 is connected between the negative tab and the negative terminal.
  • a part of the tab 31 away from the positive pole piece and the negative pole piece is bent toward the thickness direction of the electrode assembly 3 relative to the positive pole piece and the negative pole piece. fold.
  • the angle of the bend is approximately 90°.
  • the electrode assembly 3 is a wound-type electrode assembly. During the winding process, the electrode assembly 3 forms a plurality of protruding tabs 311.
  • the tabs 311 include positive tabs and negative tabs.
  • the positive tab is the positive tab.
  • the protruding part of the pole piece, the negative pole tab is the protruding part of the negative pole piece.
  • One tab piece 311 can constitute a layer of tabs 31 alone or a plurality of adjacent tabs 311 are connected together to form a layer of tabs 31 , and each layer of tabs 31 includes at least one tab piece 311 .
  • the electrode assembly 3 is a laminated electrode assembly.
  • At least one layer of tabs 31 includes a plurality of tabs 311 , the tabs 31 have a first connecting portion 31 a, and the plurality of tabs 311 are connected as a whole through the first connecting portion 31 a.
  • At least one layer of tabs 31 includes a plurality of tab pieces 311 , which reduces the number of layers of tabs 31 and lowers the requirements for the intercalation process.
  • the first connecting portion 31 a is disposed at the bent portion of the tab 31 so as to be connected to the connecting member 4 .
  • the plurality of tab pieces 311 are integrally connected by welding at the first connecting portion 31a. In some embodiments, the plurality of tabs 311 are integrated into one body through ultrasonic welding at the first connecting portion 31a.
  • Ultrasonic welding has the advantages of low cost, clean and pollution-free, and will not damage the workpiece. After ultrasonic welding, the conductivity of the tab 31 is good, and the resistance system is extremely low or close to zero, which can effectively ensure the conductivity of the tab 31 . Ultrasonic welding is an intermittent spot welding mode. After the welding is completed, a plurality of welding spots are formed on the surface of the tab 31 , and the combination of the plurality of welding spots forms the above-mentioned first connecting portion 31a.
  • each layer of tabs 31 includes a plurality of tab pieces 311 , each layer of tabs 31 has a first connection portion 31 a , and the first connection portions 31 a of each layer of tabs 31 are disposed separately.
  • Each layer of tabs 31 includes multiple tabs 311, which can minimize the number of layers of tabs 31, realize efficient intercalation with the tab connection part 41 and tabs 31, and ensure the structure of each tab 31 strength, preventing the tab 31 from being welded through.
  • the projections of the first connecting portion 31 a of the multi-layer tab 31 in the thickness direction of the tab 31 are overlapped, thereby leaving a space on the surface of the tab 31 to connect with the tab connecting portion 41 to prevent interference.
  • the distance between the first connecting portion 31a and the edge of the corresponding tab 311 is L, and the value of L is 3mm ⁇ L ⁇ 8mm. Limiting the distance L between the first connecting portion 31a and the edge of the tab 311 can effectively protect the tab 31 and prevent the tab 31 from being welded through to prevent the tab 31 from being folded over.
  • the number of tab pieces 311 included in each layer of tabs 31 is the same, so that the thickness and structural strength of each layer of tabs 31 are the same to ensure consistency.
  • the number of tab pieces 311 contained in each layer of tabs 31 is 4 to 8, so as to ensure the welding effect while optimizing the intercalation process, and at the same time prevent the tabs 31 from being folded and damaged due to insufficient structural strength. Insert the pole piece upside down.
  • Fig. 7 shows a schematic structural view of a connecting part of a battery cell provided by some embodiments of the present application
  • Fig. 8 shows a front view of a connecting part of a battery cell provided by some embodiments of the present application.
  • connection component 4 further includes a terminal connection portion 42 for connecting the electrode terminal 2 , and a plurality of tab connection portions 41 are connected to the terminal connection portion 42 .
  • the connecting part 4 is an integrally formed member; or at least one of the plurality of lug connecting portions 41 is integrally formed with the terminal connecting portion 42 , and the rest of the plurality of lug connecting portions 41 are welded to the terminal connecting portion 42 .
  • one surface of the terminal connection portion 42 is provided with a connection protrusion 421 for connecting with the electrode terminal 2 .
  • the connection protrusion 421 is electrically connected to the electrode terminal 2 by laser welding, so as to ensure the connection reliability between the connection component 4 and the electrode terminal 2 .
  • a plurality of tab connection portions 41 are connected to the terminal connection portion 42 at intervals.
  • the thickness of the terminal connecting portion 42 is greater than the total thickness of the plurality of tab connecting portions 41, and the plurality of tab connecting portions 41 are connected to the side surfaces of the terminal connecting portion 42 at intervals, and the plurality of tab connecting portions 41 form a plurality of plugging intervals.
  • the layer tabs 31 are sequentially inserted into a plurality of insertion spaces.
  • one lug connecting portion 41 is integrally formed with the terminal connecting portion 42, the lug connecting portion 41 is flush with one surface of the terminal connecting portion 42, and the remaining multiple lug connecting portions 41 are welded to the terminal at intervals.
  • the side of the connection part 42 a plurality of lug connecting parts 41 are fixed to the side of the terminal connecting part 42 by ultrasonic welding, so as to ensure the structural strength and electrical conductivity of the connecting part 4 .
  • the number of layers of the tab connecting portion 41 is one more than that of the tab 31 , and each layer of tab 31 is sandwiched between two layers of tab connecting portions 41 .
  • the tab 31 can be connected to the tab In the structure formed by stacking the parts 41 , the outermost layer is the tab connecting part 41 , which effectively protects the tab 31 .
  • Fig. 9 shows a schematic diagram of the connection principle between tabs and connecting components of a battery cell provided in some embodiments of the present application.
  • the multi-layer tab connection part 41 is connected to the multi-layer tab 31 to form a second connection part 31b, and the multi-layer tab connection part 41 and the multi-layer tab 31 are connected as a whole at the second connection part 31b.
  • the projection of the first connection portion 31 a and the projection of the second connection portion 31 b do not overlap.
  • the second connecting portion 31b is formed at the part where the lug 31 is folded relative to the pole piece.
  • the second connecting portion 31b and the first connecting portion 31a do not overlap in the thickness direction of the lug connecting portion 41, so that the mutual avoidance of the two connecting portions can be realized. , prevent heavy welding, avoid welding through the tab 31, improve safety, and increase the contact area between the tab 31 and the tab connection portion 41 to improve welding strength.
  • the multi-layer tab 31 and the multi-layer tab connection part 41 are integrated by ultrasonic welding, so as to ensure the electrical conductivity of the overall structure formed by connecting the tab 31 and the connecting component 4 .
  • the first connecting portion 31a is surrounded on the outside of the second connecting portion 31b; or, the first connecting portion 31a is provided in multiples, and the multiple first connecting portions 31a are arranged along the sides of the second connecting portion 31b. Circumferential interval setting.
  • the first connecting portion 31a is surrounded by the outer side of the second connecting portion 31b, which can realize the maximum contact area between the tab 31 and the tab connecting portion 41 within the limited connection area of the tab 31, improve the strength of welding, and optimize the welding process at the same time , to facilitate construction.
  • the thickness of the tab connection portion 41 is greater than the thickness of each tab 31 . Making the thickness of the tab connection part 41 greater than the thickness of each tab 31 can effectively protect the tabs 31 and improve welding strength.
  • FIG. 10 shows a schematic explosion diagram of a battery cell provided by some other embodiments of the present application
  • FIG. 11 shows a schematic explosion diagram of a battery cell provided by some other embodiments of the present application.
  • the battery cell includes a plurality of identical electrode assemblies 3 , and the plurality of electrode assemblies 3 are connected in parallel through the connecting member 4 and accommodated in the casing 1 .
  • Fig. 12 shows a schematic structural view of the connecting part 4 of the battery cell shown in Fig. 10 and Fig. 11;
  • Fig. 13 shows the connection between the tab 31 of the battery cell shown in Fig. 10 and Fig. 11 and the connecting part 4 Schematic diagram of the principle.
  • the battery cell includes a plurality of electrode assemblies 3, and the tabs 31 of the plurality of electrode assemblies 3 are grouped individually or in pairs to form two sets of tabs, and the multilayer poles in each set of tabs are The ears 31 are arranged at intervals.
  • the connecting part 4 includes a connected terminal connection part 42 and a multi-layer tab connection part 41.
  • the multi-layer tab connection part 41 is divided into two parts, and the two parts of the tab connection part 41 are arranged symmetrically with respect to the terminal connection part 42.
  • the connection parts 41 are alternately arranged and connected to two sets of tab groups respectively.
  • the connection mode of the tab connection part 41 and the tab 31 is the same as that of the tab connection part 41 and the tab 31 in the embodiments shown in FIGS. 1-9 , and will not be repeated here in this embodiment.
  • connection part 4 can realize the parallel connection of a plurality of electrode assemblies 3 , and the high-efficiency confluence of electric current can be realized through the connection part 4 .
  • the lug connection portion 41 of the connecting member 4 is divided into two parts to increase the contact area between the connecting member 4 and the lug 31 , which further improves the connection strength and safety.
  • Fig. 14 shows a flowchart of a method for manufacturing a battery cell provided by some embodiments of the present application. As shown in Figure 14, the flow chart of the manufacturing method of the battery cell provided in the embodiment of the present application includes:
  • each layer of tabs 31 includes at least one tab piece 311;
  • connection part 4 includes a multi-layer tab connection part 41;
  • connection part 4 Connect the connection part 4 to the electrode terminal 2, and install the electrode assembly 3 and the connection part 4 into the containing chamber.
  • Fig. 15 is a schematic block diagram of a manufacturing device for a battery cell provided by some embodiments of the present application.
  • the manufacturing equipment for battery cells includes:
  • the first providing device is used to provide the electrode assembly 3, the electrode assembly 3 is provided with tabs 31, the tabs 31 are provided with multiple layers, and each layer of tabs 31 includes at least one tab piece 311;
  • connection part 4 includes a multi-layer tab connection part 41;
  • the first assembly device is used for alternately stacking and connecting the multi-layer tab connection part 41 and the multi-layer tab 31;
  • the third providing device is used to provide the casing 1 and the electrode terminals 2 arranged on the casing 1, the casing 1 has a receiving cavity;
  • the second assembling device is used for connecting the connection part 4 to the electrode terminal 2, and installing the electrode assembly 3 and the connection part 4 into the accommodating cavity.

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Abstract

本申请实施例提供一种电池单体及其制造方法和制造设备、电池及用电装置，电池单体包括：外壳，具有容纳腔；电极端子，设置于外壳，用于引出电池单体的电能；电极组件，容纳于容纳腔内且设置有极耳，极耳设置有多层，每层极耳包含至少一个极耳片；以及连接部件，用于连接电极端子与极耳，连接部件包括多层极耳连接部，多层极耳连接部与多层极耳交替层叠设置。电池括上述的电池单体。用电装置包括上述的电池。电池单体的制造方法和制造设备用于制造上述电池单体。本申请实施例提供的方案能够提高极耳与连接部件的连接强度，保证电池单体及电池的安全性。

Description

电池单体及其制造方法和制造设备、电池及用电装置 技术领域
本申请涉及电池技术领域，并且更具体地，涉及一种电池单体及其制造方法和制造设备、电池及用电装置。
背景技术
电池单体广泛用于电子设备，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。
在电池技术的发展中，除了提高电池单体的性能外，安全问题也是一个不可忽视的问题。如果电池单体的安全问题不能保证，那该电池单体就无法使用。因此，如何增强电池单体的安全性，是电池技术中一个亟待解决的技术问题。
发明内容
本申请提供了一种电池单体及其制造方法和制造设备、电池及用电装置，能够增强电池单体及电池的安全性。
第一方面，本申请实施例提供了一种电池单体，包括：外壳，具有容纳腔；电极端子，设置于外壳，用于引出电池单体的电能；电极组件，容纳于容纳腔内且设置有极耳，极耳设置有多层，每层极耳包含至少一个极耳片；以及连接部件，用于连接电极端子与极耳，连接部件包括多层极耳连接部，多层极耳连接部与多层极耳交替层叠设置。
在本申请实施例的技术方案中，通过采用具有多层极耳连接部的连接部件来连接极耳和电极端子，且多层极耳连接部与多层极耳交替层叠设置并连接，能够增大连接部件与极耳的接触面积，提高连接部件与极耳的 连接强度，有效解决在高强震动条件下极耳撕裂的问题，降低极耳因撕裂而插入电极组件的风险，避免短路，进一步提高电池的整体安全性。
在一些实施例中，极耳连接部的层数比极耳的层数多一层，且每层极耳均夹持在两层极耳连接部之间。
上述方案中，通过使极耳连接部的层数比极耳的层数多一层，且每层极耳均夹持在两层极耳连接部之间，能够使得极耳与极耳连接部层叠形成的结构中最外层是极耳连接部，对极耳形成有效的保护。
在一些实施例中，至少一层极耳包括多个极耳片，极耳具有第一连接部，多个极耳片通过第一连接部连接为一体。
上述方案中，多个连接在一起的极耳片可以增大极耳的整体厚度，简化极耳连接部与极耳的交叠工艺；同时，多个极耳片彼此连接，可以提高极耳的过流能力。
在一些实施例中，每层极耳包括多个极耳片，每层极耳具有第一连接部，每层极耳的第一连接部分离设置。
在一些实施例中，多层极耳连接部连接于多层极耳并形成第二连接部，多层极耳连接部与多层极耳在第二连接部连接为一体；在极耳连接部的厚度方向上，第一连接部的投影与第二连接部的投影不重叠。
上述方案中，第一连接部和第二连接部在极耳连接部的厚度方向上不重叠，这样能够实现两个连接部的相互避让，防止重焊，避免焊穿极耳，提高安全性，同时增大极耳与极耳连接部的接触面积，提高焊接强度。
在一些实施例中，第一连接部围设在第二连接部的外侧；或，第一连接部设置有多个，多个第一连接部沿着第二连接部部的周向间隔设置。第一连接部围设于第二连接部外能够在极耳有限的连接面积内实现极耳与极耳连接部的最大接触面积，提高焊接强度，且同时优化焊接的工艺，便于施工。
在一些实施例中，第一连接部与相应的极耳片的边缘之间的距离为L，L的取值为3mm≤L≤8mm。限定第一连接部与极耳片的边缘之间的距离能够在有效保护极耳、防止极耳被焊穿的基础上防止极耳翻折。
在一些实施例中，极耳连接部的厚度大于每层极耳的厚度。使极耳 连接部的厚度大于每层极耳的厚度能够有效保护极耳，且提高焊接强度。
在一些实施例中，连接部件还包括端子连接部，端子连接部用于连接电极端子，多个极耳连接部连接于端子连接部；连接部件为一体成型的构件；或者，多个极耳连接部中的至少一个与端子连接部一体成型，多个多个极耳连接部中的剩余部分焊接于端子连接部。连接部件的该种结构能够有效连接电极端子和极耳，在保证连接部件结构强度的基础上实现极耳和电极端子的良好的电连接。
在一些实施例中，多个极耳连接部间隔地连接于端子连接部。
第二方面，本申请实施例提供了一种电池，包括第一方面任一实施例提供的电池单体。
第三方面，本申请实施例提供了一种用电装置，包括第一方面任一实施例提供的电池单体，电池单体用于提供电能。
第四方面，本申请实施例提供了一种电池单体的制造方法，包括：提供电极组件，电极组件设置有极耳，极耳设置有多层，每层极耳包括至少一个极耳片；提供连接部件，连接部件包括多层极耳连接部；将多层极耳连接部与多层极耳交替层叠设置并连接；提供外壳和设置于外壳的电极端子，外壳具有容纳腔；将连接部件连接于电极端子，并将电极组件和连接部件安装到容纳腔内。
第五方面，本申请实施例提供了一种电池单体的制造设备，包括：第一提供装置，用于提供电极组件，电极组件设置有极耳，极耳设置有多层，每层极耳包括至少一个极耳片；第二提供装置，用于提供连接部件，连接部件包括多层极耳连接部；第一组装装置，用于将多层极耳连接部与多层极耳交替层叠设置并连接；第三提供装置，用于提供外壳和设置于外壳的电极端子，外壳具有容纳腔；第二组装装置，用于将连接部件连接于电极端子，并将电极组件和连接部件安装到容纳腔内。
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提供车辆的结构示意图；
图2是本申请一些实施例提供的电池的爆炸示意图；
图3是图2所示的电池的电池模块的结构示意图；
图4是本申请一些实施例提供的电池单体的爆炸示意图；
图5是本申请一些实施例提供电池单体的电极组件的结构示意图；
图6是图5中J处的放大图；
图7是本申请一些实施例提供的电池单体的连接部件的结构示意图；
图8是本申请一些实施例提供的电池单体的连接部件的正视图；
图9是本申请一些实施例提供的电池单体的极耳与连接部件的连接原理示意图；
图10是本申请另一些实施例提供的电池单体的爆炸示意图；
图11是本申请再一些实施例提供的电池单体的爆炸示意图；
图12是图11所示的电池单体的连接部件的结构示意图；
图13是图11所示的电池单体的极耳与连接部件的连接原理示意图；
图14是本申请一些实施例提供的电池单体的制造方法的流程图；
图15是本申请一些实施例提供的电池单体的制造设备的示意性框图。
图中标示如下：
1、外壳；11、壳体；12、端盖；2、电极端子；3、电极组件；31、极耳；311、极耳片；31a、第一连接部；31b、第二连接部；4、连接部件；41、极耳连接部；42、端子连接部；421、连接凸部；5、防爆阀；10、电池单体；20、汇流部件；30、电池模块；40、箱体；401、第一箱体部；402、第二箱体部；100、电池；200、控制器；300、马达；400、车辆。
具体实施方式
为使本申请实施例的目的、技术方案和优点更加清楚，下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基 于本申请中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本申请保护的范围。
除非另有定义，本申请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；本申请中在申请的说明书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。本申请的说明书和权利要求书或上述附图中的术语“第一”、“第二”等是用于区别不同对象，而不是用于描述特定顺序或主次关系。
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，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”、“附接”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，可以是两个元件内部的连通。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中的具体含义。
本申请中术语“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，本申请中字符“/”，一般表示前后关联对象是一种“或”的关系。
在本申请的实施例中，相同的附图标记表示相同的部件，并且为了简洁，在不同实施例中，省略对相同部件的详细说明。应理解，附图示出的本申请实施例中的各种部件的厚度、长宽等尺寸，以及集成装置的整体厚度、长宽等尺寸仅为示例性说明，而不应对本申请构成任何限定。
本申请中出现的“多个”指的是两个以上(包括两个)。
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。
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、负极极片和隔离件。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涂覆区和连接于正极涂覆区的正极极耳，正极涂覆区涂覆有正极活性物质层，正极极耳未涂覆正极活性物质层。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涂覆区和连接于负极涂覆区的负极极耳，负极涂覆区涂覆有负极活性物质层，负极极耳未涂覆负极活性物质层。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。隔离件的材质可以为PP(polypropylene，聚丙烯)或PE(polyethylene，聚乙烯)等。
在相关技术中，电池单体的极耳通过连接部件与电极端子电连接，连接部件一般是软质的金属片。发明人发现，现有技术中的连接部件是单层结构，连接部件与极耳的连接面积有限，在高强度振动条件下极耳与连接部件容易发生脱离连接或者极耳撕裂，导致接触不良，对外供电中断。极耳在断开与连接部件后，其容易插入到电极组件的内部，造成短路，从而引发安全风险。
鉴于此，本申请提供了一种技术方案，在该技术方案中，电池单体的极耳设置成多层，且连接部件包括多层极耳连接部，多层极耳与多层极 耳连接部交替层叠设置并连接在一起，增大了极耳与连接部件的连接面积，提高了连接的结构强度，有效解决了在高强震动条件下极耳撕裂的问题，降低极耳因撕裂而插入电极组件的风险，避免短路，进一步提高电池的整体安全性，保证了供电的稳定性。
本申请实施例描述的技术方案适用于电池以及使用电池的用电装置。
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。
图1是本申请一些实施例提供的车辆的结构示意图。
如图1所示，车辆400的内部设置有电池100，电池100可以设置在车辆400的底部、头部或者尾部。电池100可以用于车辆400的供电，例如，电池100可以作为车辆400的操作电源。
车辆400还可以包括控制器200和马达300，控制器200用来控制电池100为马达300供电，例如，用于车辆400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100不仅仅可以作为车辆400的操作电源，还可以作为车辆400的驱动电源，代替或部分地代替燃油或天然气为车辆400提供驱动动力。
图2为本申请一些实施例提供的电池100的爆炸示意图。
如图2所示，电池100包括箱体40和电池单体10(图2未示出)，电池单体10容纳于箱体40内。
箱体40用于容纳电池单体10，箱体40可以是多种结构。在一些实 施例中，箱体40可以包括第一箱体部401和第二箱体部402，第一箱体部401与第二箱体部402相互盖合，第一箱体部401和第二箱体部402共同限定出用于容纳电池单体10的容纳空间。第二箱体部402可以是一端开口的空心结构，第一箱体部401为板状结构，第一箱体部401盖合于第二箱体部402的开口侧，以形成具有容纳空间的箱体40；第一箱体部401和第二箱体部402也均可以是一侧开口的空心结构，第一箱体部401的开口侧盖合于第二箱体部402的开口侧，以形成具有容纳空间的箱体40。当然，第一箱体部401和第二箱体部402可以是多种形状，比如，圆柱体、长方体等。
为提高第一箱体部401与第二箱体部402连接后的密封性，第一箱体部401与第二箱体部402之间也可以设置密封件，比如，密封胶、密封圈等。
假设第一箱体部401盖合于第二箱体部402的顶部，第一箱体部401亦可称之为上箱盖，第二箱体部402亦可称之为下箱体。
在电池100中，电池单体10可以是一个，也可以是多个。若电池单体10为多个，多个电池单体10之间可串联或并联或混联，混联是指多个电池单体10中既有串联又有并联。多个电池单体10之间可串联或并联或混联在一起，再将多个电池单体10构成的整体容纳于箱体40内。当然，也可以是多个电池单体10先串联或并联或混联组成电池模块30，多个电池模块30再串联或并联或混联形成一个整体，并容纳于箱体5内。
图3为图2所示的电池模块的结构示意图。
如图3所示，在一些实施例中，电池单体10为多个，多个电池单体10先串联或并联或混联组成电池模块30。多个电池模块30再串联或并联或混联形成一个整体，并容纳于箱体40内。电池模块30中的多个电池单体10之间通过汇流部件20实现电连接，以实现电池模块30中的多个电池单体10的并联或串联或混联。
图4是本申请一些实施例提供的电池单体的爆炸示意图；图5是本申请一些实施例提供的电池单体的电极组件的结构示意图；图6是图5中J处的放大图。
如图4至图6所示，电池单体10包括外壳1及电极端子2，外壳1具有容纳腔，电极端子2设置于外壳1上，电极端子2用于引出电池单体10的电能。电池单体10还包括电极组件3和连接部件4，电极组件3容纳于容纳腔内且设置有极耳31，极耳31设置有多层，每层极耳31包含至少一个极耳片311；连接部件4用于连接电极端子2与极耳31，连接部件4包括多层极耳连接部41，多层极耳连接部41与多层极耳31交替层叠设置。
在本申请实施例的技术方案中，通过采用具有多层极耳连接部41的连接部件4来连接极耳31和电极端子2，且多层极耳连接部41与多层极耳31交替层叠设置并连接，能够增大连接部件4与极耳31的接触面积，极大提高连接部件4与极耳31的连接强度，有效解决高强震动条件下极耳31和连接部件4脱离连接的问题，进一步提高电池的整体安全性。
外壳1包括壳体11和端盖12，壳体11的一端封闭，另一端设置有壳体开口，端盖12盖合于壳体开口上，壳体11围设形成容纳腔，电极组件3设置于容纳腔内。壳体11的结构可以呈圆柱体、扁平体、长方体或其它形状等，本申请实施例对此不作限定。
电极端子2设置于端盖12上，电极端子2向内伸入壳体11内并与极耳31电连接。端盖12上设置有防爆阀5，防爆阀5能够在电池单体热失控时及时打开，将电池单体内的高温高压气体及时排出，防止电池单体的起火和爆炸。
电极组件3具有两个极耳31，两个极耳31分别为正极极片和负极极片外凸的一部分，即两个极耳31分别是正极极耳和负极极耳。两个极耳31的结构相同，本申请的方案主要涉及极耳31与连接部件4的结构，因此未对极耳31的极性作区分。
与极耳31的极性相对应，电极端子2和连接部件4也分别设置有两个。两个电极端子2分别为正极端子和负极端子，两个电极端子2对称设置于端盖12的两侧。一个连接部件4连接于正极极耳和正极端子之间，另一个连接部件4连接于负极极耳和负极端子之间。
如图5和图6所示，为便于极耳31与连接部件4的连接，极耳31远离正极极片和负极极片的一部分朝向电极组件3的厚度方向相对正极极 片和负极极片弯折。在一些实施例中，弯折的角度大致呈90°。
电极组件3为卷绕式电极组件，电极组件3在卷绕过程中形成多个外凸的极耳片311，极耳片311包括正极极耳片和负极极耳片，正极极耳片为正极极片的外凸部分，负极极耳片为负极极片的外凸部分。一个极耳片311能够单独构成一层极耳31或者相邻的多个极耳片311连接在一起构成一层极耳31，每层极耳31包括至少一个极耳片311。
在一些实施例中，电极组件3为叠片式电极组件。
在一些实施例中，至少一层极耳31包括多个极耳片311，极耳31具有第一连接部31a，多个极耳片311通过第一连接部31a连接为一体。
至少一层极耳31包括多个极耳片311减少了极耳31的层数，降低了对插层工艺的要求。
第一连接部31a设置于极耳31弯折的部分，以便于与连接部件4连接。多个极耳片311在第一连接部31a通过焊接连接为一体。在一些实施例中，多个极耳片311在第一连接部31a通过超声波焊接连接成为一体。
超声波焊接具有成本低廉、清洁无污染且不会损伤工件的优点，超声波焊接后极耳31导电性好，电阻系统极低或接近于零，能够有效保证极耳31的导电性。超声波焊接为间断式的点焊模式，焊接完成后在极耳31表面形成多个焊点，多个焊点组合形成上述第一连接部31a。
在一些实施例中，每层极耳31包括多个极耳片311，每层极耳31具有第一连接部31a，每层极耳31的第一连接部31a分离设置。
每层极耳31包括多个极耳片311能够最大程度地减少极耳31的层数，实现与极耳连接部41与极耳31的高效插层，并且能够保证每层极耳31的结构强度，防止极耳31被焊穿。
多层极耳31的第一连接部31a在极耳31的厚度方向上的投影重合，从而在极耳31表面上留出与极耳连接部41连接的空间，防止产生干涉。
在一些实施例中，第一连接部31a与相应的极耳片311的边缘之间的距离为L，L的取值为3mm≤L≤8mm。限定第一连接部31a与极耳片311的边缘之间的距离L能够在有效保护极耳31、防止极耳31被焊穿的基础上防止极耳31翻折。
在一些实施例中，每层极耳31所包含的极耳片311的数量相同，以使每层极耳31的厚度和结构强度相同，保证一致性。可选地，每层极耳31所包含的极耳片311的个数为4～8个，以在优化插层工艺同时保证焊接效果，同时防止极耳31因结构强度不够而导致翻折和倒插入极片。
图7示出了本申请一些实施例提供的电池单体的连接部件的结构示意图；图8示出了本申请一些实施例提供的电池单体的连接部件的正视图。
如图7和图8所示，连接部件4还包括端子连接部42，端子连接部42用于连接电极端子2，多个极耳连接部41连接于端子连接部42。连接部件4为一体成型的构件；或者多个极耳连接部41中的至少一个与端子连接部42一体成型，多个极耳连接部41中的剩余部分焊接于端子连接部42。
在一些实施例中，端子连接部42的其中一个表面设置有连接凸部421，连接凸部421用于与电极端子2连接。在一些实施例中，连接凸部421通过激光焊接与电极端子2实现电连接，以保证连接部件4与电极端子2的连接可靠性。
在一些实施例中，多个极耳连接部41间隔地连接于端子连接部42。
端子连接部42的厚度大于多个极耳连接部41的总厚度，多个极耳连接部41间隔连接于端子连接部42的侧面，多个极耳连接部41形成多个插接间隔，多层极耳31依次插装于多个插接间隔内。
在一些实施例中，一个极耳连接部41与端子连接部42一体成型，该极耳连接部41与端子连接部42的其中一个表面平齐，其余多个极耳连接部41间隔焊接于端子连接部42侧面。在一些实施例中，多个极耳连接部41通过超声波焊接固定于端子连接部42的侧面，以保证连接部件4的结构强度和导电性。
在一些实施例中，极耳连接部41的层数比极耳31的层数多一层，且每层极耳31均夹持在两层极耳连接部41之间。通过使极耳连接部41的层数比极耳31的层数多一层，且每层极耳31均夹持在两层极耳连接部41之间，能够使得极耳31与极耳连接部41层叠形成的结构中最外层是极耳连接部41，对极耳31形成有效的保护。
图9示出了本申请一些实施例提供的电池单体的极耳与连接部件的 连接原理示意图。如图9所示，多层极耳连接部41连接于多层极耳31并形成第二连接部31b，多层极耳连接部41与多层极耳31在第二连接部31b连接为一体；在极耳连接部41的厚度方向上，第一连接部31a的投影与第二连接部31b的投影不重叠。
第二连接部31b形成于极耳31相对极片翻折的部分，第二连接部31b与第一连接部31a在极耳连接部41的厚度方向上不重叠能够实现两个连接部的相互避让，防止重焊，避免焊穿极耳31，提高安全性，同时增大极耳31与极耳连接部41的接触面积，提高焊接强度。
在一些实施例中，多层极耳31与多层极耳连接部41通过超声波焊接连接为一体，以保证极耳31与连接部件4连接形成的整体结构的导电性。
在一些实施例中，第一连接部31a围设在第二连接部31b的外侧；或，第一连接部31a设置有多个，多个第一连接部31a沿着第二连接部31b部的周向间隔设置。
第一连接部31a围设于第二连接部31b外侧能够在极耳31有限的连接面积内实现极耳31与极耳连接部41的最大接触面积，提高焊接的强度，且同时优化焊接的工艺，便于施工。
在一些实施例中，极耳连接部41的厚度大于每层极耳31的厚度。使极耳连接部41的厚度大于每层极耳31的厚度能够有效保护极耳31，且提高焊接强度。
图10示出了本申请另一些实施例提供的电池单体的爆炸示意图；图11示出了本申请再一些实施例提供的电池单体的爆炸示意图。在图10和图11所示的实施例中，电池单体包括多个相同的电极组件3，多个电极组件3通过连接部件4并联成一体并容纳于外壳1内。
图12示出了图10和图11所示的电池单体的连接部件4的结构示意图；图13示出了图10和图11所示的电池单体的极耳31与连接部件4的连接原理示意图。
在上述实施例中，电池单体包括多个电极组件3，多个电极组件3的极耳31单独成组或者两两成组形成两组极耳组，每组极耳组中的多层 极耳31间隔设置。连接部件4包括相连的端子连接部42和多层极耳连接部41，多层极耳连接部41分成两部分，两部分极耳连接部41相对于端子连接部42对称设置，两部分极耳连接部41分别与两组极耳组交替间隔设置并连接。极耳连接部41与极耳31的连接方式与图1-图9中所示的实施例中极耳连接部41与极耳31的连接方式相同，本实施例在此不再赘述。
连接部件4的上述结构能够实现多个电极组件3的并联，通过连接部件4实现电流的高效汇流。同时连接部件4的极耳连接部41分成两部分增大了连接部件4与极耳31的接触面积，进一步提高了连接强度，提高了安全性。
图14示出了本申请一些实施例提供的电池单体的制造方法的流程图。如图14所示，本申请实施例提供的电池单体的制造方法的流程图包括：
S100、提供电极组件3，电极组件3设置有极耳31，极耳31设置有多层，每层极耳31包括至少一个极耳片311；
S200、提供连接部件4，连接部件4包括多层极耳连接部41；
S300、将多层极耳连接部41与多层极耳31交替层叠设置并连接；
S400、提供外壳1和设置于外壳1的电极端子2，外壳1具有容纳腔；
S500、将连接部件4连接于电极端子2，并将电极组件3和连接部件4安装到容纳腔内。
需要说明的是，通过上述电池单体的制造方法制造出的电池单体的相关结构，可参见上述各实施例提供的电池单体。
在基于上述的电池单体的制造方法组装电池单体时，可以不必按照上述步骤依次进行，也就是说，可以按照实施例中提及的顺序执行步骤，也可以不同于实施例中提及的顺序执行步骤，或者若干步骤同时执行。
图15为本申请一些实施例提供的电池单体的制造设备的示意性框图。
如图15所示，电池单体的制造设备包括：
第一提供装置，用于提供电极组件3，电极组件3设置有极耳31， 极耳31设置有多层，每层极耳31包括至少一个极耳片311；
第二提供装置，用于提供连接部件4，连接部件4包括多层极耳连接部41；
第一组装装置，用于将多层极耳连接部41与多层极耳31交替层叠设置并连接；
第三提供装置，用于提供外壳1和设置于外壳1的电极端子2，外壳1具有容纳腔；
第二组装装置，用于将连接部件4连接于电极端子2，并将电极组件3和连接部件4安装到容纳腔内。
通过上述制造系统制造出的电池单体的相关结构，可参见上述各实施例提供的电池单体。
需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
最后应说明的是：以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换，但这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (14)

  1. 一种电池单体，包括：
    外壳，具有容纳腔；
    电极端子，设置于所述外壳，用于引出所述电池单体的电能；
    电极组件，容纳于所述容纳腔内且设置有极耳，所述极耳设置有多层，每层所述极耳包含至少一个极耳片；以及
    连接部件，用于连接所述电极端子与所述极耳，所述连接部件包括多层极耳连接部，多层所述极耳连接部与多层所述极耳交替层叠设置。
  2. 根据权利要求1所述电池单体，其中，所述极耳连接部的层数比所述极耳的层数多一层，且每层所述极耳均夹持在两层所述极耳连接部之间。
  3. 根据权利要求1所述的电池单体，其中，至少一层所述极耳包括多个所述极耳片，所述极耳具有第一连接部，多个所述极耳片通过所述第一连接部连接为一体。
  4. 根据权利要求3所述的电池单体，其中，每层所述极耳包括多个所述极耳片，每层所述极耳具有所述第一连接部，每层所述极耳的所述第一连接部分离设置。
  5. 根据权利要求3所述的电池单体，其中，多层所述极耳连接部连接于多层所述极耳并形成第二连接部，多层所述极耳连接部与多层所述极耳通过所述第二连接部连接为一体；
    在所述极耳连接部的厚度方向上，所述第一连接部的投影与所述第二连接部的投影不重叠。
  6. 根据权利要求5所述的电池单体，其中，
    所述第一连接部围设在所述第二连接部的外侧；或，
    所述第一连接部设置有多个，多个所述第一连接部沿着所述第二连接部部的周向间隔设置。
  7. 根据权利要求3-6任一项所述的电池单体，其中，所述第一连接部与相应的所述极耳片的边缘之间的距离为L，L的取值为3mm≤L≤8mm。
  8. 根据权利要求1所述的电池单体，其中，所述极耳连接部的厚度大于每层所述极耳的厚度。
  9. 根据权利要求1所述的电池单体，其中，所述连接部件还包括端子连接部，所述端子连接部用于连接所述电极端子，多个所述极耳连接部连接于所述端子连接部；
    所述连接部件为一体成型的构件；或者，
    多个所述极耳连接部中的至少一个与所述端子连接部一体成型，多个所述极耳连接部中的剩余部分焊接于所述端子连接部。
  10. 根据权利要求9所述的电池单体，其中，多个所述极耳连接部间隔地连接于所述端子连接部。
  11. 一种电池，包括如权利要求1-10任一项所述的电池单体。
  12. 一种用电装置，包括如权利要求1-10任一项所述的电池单体，所述电池单体用于提供电能。
  13. 一种电池单体的制造方法，包括：
    提供电极组件，所述电极组件设置有极耳，所述极耳设置有多层，每层所述极耳包括至少一个极耳片；
    提供连接部件，所述连接部件包括多层极耳连接部；
    将多层所述极耳连接部与多层所述极耳交替层叠设置并连接；
    提供外壳和设置于所述外壳的电极端子，所述外壳具有容纳腔；
    将所述连接部件连接于所述电极端子，并将所述电极组件和所述连接部件安装到所述容纳腔内。
  14. 一种电池单体的制造设备，包括：
    第一提供装置，用于提供电极组件，所述电极组件设置有极耳，所述 极耳设置有多层，每层所述极耳包括至少一个极耳片；
    第二提供装置，用于提供连接部件，所述连接部件包括多层极耳连接部；
    第一组装装置，用于将多层所述极耳连接部与多层所述极耳交替层叠设置并连接；
    第三提供装置，用于提供外壳和设置于所述外壳的电极端子，所述外壳具有容纳腔；
    第二组装装置，用于将所述连接部件连接于所述电极端子，并将所述电极组件和所述连接部件安装到所述容纳腔内。
PCT/CN2021/125398 2021-10-21 2021-10-21 电池单体及其制造方法和制造设备、电池及用电装置 WO2023065241A1 (zh)

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JP2000340210A (ja) * 1999-05-25 2000-12-08 Sanyo Electric Co Ltd 電気エネルギー蓄積デバイス
JP2002198030A (ja) * 2000-12-25 2002-07-12 Furukawa Battery Co Ltd:The 鉛蓄電池の耳群接続ストラップ成形用治具
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