WO2023160707A1 - 极耳揉平装置 - Google Patents

极耳揉平装置 Download PDF

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Publication number
WO2023160707A1
WO2023160707A1 PCT/CN2023/078481 CN2023078481W WO2023160707A1 WO 2023160707 A1 WO2023160707 A1 WO 2023160707A1 CN 2023078481 W CN2023078481 W CN 2023078481W WO 2023160707 A1 WO2023160707 A1 WO 2023160707A1
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WO
WIPO (PCT)
Prior art keywords
electrode assembly
clamp
tab
tabs
gathering
Prior art date
Application number
PCT/CN2023/078481
Other languages
English (en)
French (fr)
Inventor
余仁鹏
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Publication of WO2023160707A1 publication Critical patent/WO2023160707A1/zh

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
    • 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 batteries, and more specifically, to a tab flattening device.
  • Energy density is one of the important indicators of battery performance.
  • Flattening the tabs on the electrode assembly of the battery can effectively reduce the space ratio of the tabs, thereby increasing the energy density of the battery.
  • flattening the tabs may cause the tabs to turn outward and fail to close, resulting in a short circuit, or metal particles produced by friction during the flattening process will affect the performance of the battery and even cause safety issues. Therefore, the process of flattening the tabs and the quality after flattening directly affect the quality and safety of the electrode assembly. Therefore, how to provide a tab flattening device to improve the quality of flattened tabs while ensuring the energy density of the battery so as to improve the performance of the battery and ensure safety performance is an urgent problem to be solved in battery technology.
  • the present application provides a tab flattening device, which improves the quality of flattened tabs while ensuring the energy density of the battery, thereby improving the performance of the battery and ensuring the safety of the battery.
  • the present application provides a lug flattening device, including: a clamp for clamping a cylindrical electrode assembly in a radial direction; a sleeve assembly including: a gathering part for holding a cylindrical electrode assembly in a first direction moving to make the tabs of the electrode assembly close to the electrode assembly, and the first direction is parallel to the electrode group The axis of the piece and towards the clamp; the limiting part, the limiting part is connected to the first end of the gathering part, and the first end faces the direction of the limiting part of the clamp and the gathering part One end of the clamp is connected, the limiting part is used to surround the electrode assembly when the gathering part moves along the first direction and abut against the clamp after the tabs are folded; the pushing part, The propulsion part is arranged at the second end of the gathering part, and the second end is far away from the clamp.
  • the tabs are squeezed along the first direction to flatten the tabs to a preset ear height.
  • the ear height refers to the height of the tab protruding from the electrode assembly along the axial direction of the electrode assembly. The height of the end face of the non-tab area.
  • the clamp is used to clamp the electrode assembly, and the sleeve assembly is used to flatten the tab.
  • the tabs are folded to the preset position through the gathering part, and then the electrode assembly is surrounded by the limiting part and abutted against the clamp, so that the electrode assembly is fixed in the axial direction, which is beneficial for the pushing part to squeeze the tab to the preset position. Ears high.
  • the technical solutions of the embodiments of the present application can improve the quality of flattened tabs while ensuring the energy density of the battery, thereby improving the performance of the battery and ensuring the safety performance of the battery.
  • the gathering part and the limiting part are cylindrical, the diameter of the gathering part gradually decreases from the first end to the second end, and the limiting part having the same diameter as the diameter of the gather at the first end.
  • the folded tabs will gradually converge toward the center, that is, move closer to the axis of the electrode assembly. Folding the tabs before extruding the tabs can avoid the occurrence of eversion of the tabs during extrusion, and avoid the risk of short circuit caused by eversion of the tabs.
  • the gathering part is curved cylindrical.
  • the tabs are gathered more smoothly during the process of gathering the tabs, and the tabs are gradually gathered towards the center, further reducing the possibility of eversion of the tabs; in addition, the gathered tabs are more uniform, which is beneficial to the subsequent extrusion process.
  • the diameter of the electrode assembly is smaller than the diameter of the gathered portion at the first end and greater than the diameter of the gathered portion at the second end. In this way, the electrode assembly can be accommodated in the limiting portion, and at the same time, the folding of the tabs can be realized.
  • the diameter of the limiting portion is 3mm-5mm larger than the diameter of the gathering portion at the second end. In this way, the tabs can be folded within a certain range.
  • the diameter of the limiting part is 10mm-14mm larger than the diameter of the electrode assembly before flattening.
  • the electrode assembly can be enclosed in the limiting part in an appropriate range, and at the same time, the diameter of the limiting part is too large to cause the electrode assembly to shift in the radial direction, that is, the limiting part realizes the limitation of the electrode assembly in the radial direction. bit.
  • the propelling part includes a propelling surface, a propelling rod and a propelling cylinder; wherein, the propelling cylinder is connected to the second end of the gathering part, and the diameter of the propelling cylinder is the same as that of the propelling cylinder.
  • the gathering portion has the same diameter at the second end; the push rod is connected to the push surface and is used to push the push surface to move in the push cylinder along the first direction, so as to squeeze the tab .
  • the propelling surface moves in the propelling tube along the first direction, so as to squeeze the folded tabs located in the propelling tube to the preset lug height.
  • the propulsion distance of the propulsion surface can also be controlled, and the ear height of the pole ear after kneading can be flexibly controlled.
  • the length of the jig is 30% to 50% of the length of the electrode assembly before flattening. In this way, the contact area between the clamp and the electrode assembly is reduced, which is beneficial to improving the roundness of the electrode assembly and reducing the deformation of the electrode assembly along the radial direction.
  • the first surface of the clamp is provided with an anti-slip structure, and the anti-slip structure is used to increase the frictional force between the electrode assembly and the clamp along the first direction, wherein , the first surface is a surface where the clamp is in contact with the electrode assembly.
  • the frictional force between the clamp and the electrode assembly along the first direction can be increased, and the stability of the electrode assembly along the axial direction during the tab extrusion process is enhanced.
  • the anti-skid structure is rubber particles.
  • the rubber particles are evenly distributed on the first surface of the clamp, so that the friction force between the electrode assembly and the clamp is more uniform, which is beneficial to limit the electrode assembly in the first direction.
  • the clamp has an abutment surface perpendicular to the first direction, and the abutment surface is used to abut against the limiting portion.
  • the limiting part is in surface contact with the clamp, which increases the abutting force between the abutting part and the clamp, which is beneficial to maintaining the stability of the sleeve assembly.
  • the sum of the lengths of the limiting portion and the gathering portion is smaller than the difference between the length of the electrode assembly before flattening and the length of the jig. Half. In this way, the tab can be squeezed from the initial state to the preset ear height.
  • the clamp is used to clamp the electrode assembly, and the sleeve assembly is used to flatten the tab.
  • the tabs are folded to the preset position through the gathering part, and then the electrode assembly is surrounded by the limiting part and abutted against the clamp, so that the electrode assembly is fixed in the axial direction, which is beneficial for the pushing part to squeeze the tab to the preset position. Ears high.
  • the technical solutions of the embodiments of the present application can improve the quality of flattened tabs while ensuring the energy density of the battery, thereby improving the performance of the battery and ensuring the safety performance of the battery.
  • Fig. 1 is the schematic diagram of the vehicle of an embodiment of the present application.
  • FIG. 2 is a schematic diagram of a battery according to an embodiment of the present application.
  • Fig. 3 is a schematic diagram of a battery cell according to an embodiment of the present application.
  • Fig. 4 is a schematic diagram of an ear kneading device according to an embodiment of the present application.
  • Fig. 5 is a schematic diagram of the tab kneading device after the tab is folded according to an embodiment of the present application
  • Fig. 6 is a schematic diagram of the tabs before and after flattening according to an embodiment of the present application.
  • Fig. 7 is a schematic diagram of a sleeve assembly according to an embodiment of the present application.
  • first, second, third, etc. are used for descriptive purposes only and should not be construed as indicating or implying relative importance. “Vertical” is not strictly vertical, but within the allowable range of error. “Parallel” is not strictly parallel, but within the allowable range of error.
  • connection should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. Disassembled connection, or integral connection; it can be directly connected, or indirectly connected through an intermediary, and it can be the internal communication of 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.
  • the battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, which are not limited in the embodiments of the present application.
  • the battery mentioned in the embodiments of the present application refers to a physical module including one or more battery cells to provide electric energy.
  • batteries mentioned in this application may include battery packs 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 consists of a positive electrode sheet, a negative electrode sheet, and a separator become.
  • a battery cell works primarily by moving metal ions between the positive and negative plates.
  • the positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer.
  • the positive electrode active material layer is coated on the surface of the positive electrode current collector.
  • the current collector not coated with the positive electrode active material layer protrudes from the current collector coated with the positive electrode active material layer.
  • the current collector coated with the positive electrode active material layer serves as the positive electrode tab.
  • the material of the positive electrode current collector can be aluminum, and 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.
  • the negative electrode active material layer is coated on the surface of the negative electrode current collector.
  • the current collector without the negative electrode active material layer protrudes from the current collector coated with the negative electrode active material layer.
  • the current collector coated with the negative electrode active material layer serves as the negative electrode tab.
  • the material of the negative electrode current collector may be copper, and the negative electrode active material may be carbon or silicon.
  • the material of the isolation film can be polypropylene (PP) or polyethylene (PE).
  • multiple battery cells in the battery can be connected in series, parallel or mixed, where the mixed connection refers to a mixture of series and parallel.
  • multiple battery cells can be connected in series, parallel or mixed to form a battery module, and then multiple battery modules can be connected in series, parallel or mixed to form a battery. That is to say, multiple battery cells can directly form a battery, or form a battery module first, and then form a battery from the battery module.
  • the battery is further arranged in the electric device to provide electric energy for the electric device.
  • Power batteries are not only used in energy storage power systems such as hydraulic, thermal, wind and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, as well as military equipment and aerospace and other fields .
  • electric vehicles such as electric bicycles, electric motorcycles, electric vehicles, as well as military equipment and aerospace and other fields .
  • With the continuous expansion of power battery application fields its market demand is also constantly expanding.
  • the application of cylindrical batteries is becoming more and more extensive.
  • the present application provides a lug flattening device, including a clamp and a sleeve assembly.
  • the clamp and the stopper in the sleeve assembly can cooperate with each other to limit the electrode assembly in its axial direction.
  • the gathering part in the sleeve assembly can gather the tabs so that the propelling part in the sleeve assembly can squeeze the gathered tabs pole ears, thus avoiding rubbing The short circuit caused by the eversion of the tabs during the flattening process.
  • the flattening of the tabs is achieved by extrusion, which reduces the generation of metal particles during the flattening process and avoids the occurrence of abnormal self-discharge. Therefore, the technical solution of the embodiment of the present application can improve the quality of the tab, thereby improving the performance of the battery.
  • cylindrical battery cells which are suitable for various devices that use batteries, such as mobile phones, portable devices, notebook computers, battery cars, electric toys, electric tools, Electric vehicles, ships and spacecraft, etc.
  • spacecraft include airplanes, rockets, space shuttles and spaceships, etc.
  • FIG. 1 is a schematic structural diagram of a vehicle 1 according to an embodiment of the present application.
  • the vehicle 1 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.
  • a motor 40 , a controller 60 and a battery 10 can be arranged inside the vehicle 1 , and the controller 60 is used to control the battery 10 to supply power to the motor 40 .
  • the battery 10 may be provided at the bottom or front or rear of the vehicle 1 .
  • the battery 10 can be used for power supply of the vehicle 1 , for example, the battery 10 can be used as an operating power source of the vehicle 1 , for a circuit system of the vehicle 1 , for example, for starting, navigating and running power requirements of the vehicle 1 .
  • the battery 10 can not only be used as an operating power source for the vehicle 1 , but can also be used as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .
  • the battery 10 may include multiple battery cells.
  • FIG. 2 which is a schematic structural diagram of a battery 10 according to an embodiment of the present application
  • the battery 10 may include a plurality of battery cells 20 .
  • the battery 10 may further include a box body 11 , the inside of which is a hollow structure, and a plurality of battery cells 20 are accommodated in the box body 11 .
  • a plurality of battery cells 20 are placed in the case 11 after being connected in parallel, in series or in parallel.
  • the box body 11 may include a first box body portion 111 and a second box body portion 112 , as long as the battery cells can be accommodated, there is no specific limitation here.
  • the battery 10 may also include other structures, which will not be repeated here.
  • the battery 10 may also include a confluence part, which is used to realize electrical connection between a plurality of battery cells 20 , such as parallel connection, series connection or mixed connection.
  • the current-combining component can realize the electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20 .
  • the bus member may be fixed to the electrode terminal of the battery cell 20 by welding. The electric energy of the plurality of battery cells 20 can be further drawn out through the box through the conductive mechanism.
  • the conductive mechanism can also belong to in confluence components.
  • the number of battery cells 20 can be set to any value. Multiple battery cells 20 can be connected in series, in parallel or in parallel to achieve greater capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, for the convenience of installation, the battery cells 20 may be arranged in groups, and each group of battery cells 20 constitutes a battery module. The number of battery cells 20 included in the battery module is not limited and can be set according to requirements.
  • a battery may include a plurality of battery modules, which may be connected in series, in parallel or in parallel.
  • FIG. 3 it is a schematic structural diagram of a battery cell 20 according to an embodiment of the present application.
  • the battery cell 20 includes a case 21 , an end cap 22 and an electrode assembly 23 .
  • the housing 21 and the end cover 22 form a casing or a battery box, and the walls of the housing 21 and the end cover 22 are both called the walls of the battery cell 20 .
  • the casing 21 is determined according to the combined shape of one or more electrode assemblies 23 .
  • the casing 21 may be a hollow cylinder as shown in FIG. 3 , or, if the battery cell 20 is a blade type battery cell, the casing 21 may be a long cuboid.
  • the casing 21 has an opening so that one or more electrode assemblies 23 are placed in the casing 21 .
  • the end surface of the casing 21 is an open surface, that is, the end surface does not have a wall so that the inside and outside of the casing 21 communicate.
  • the cylindrical battery cell has two circular end surfaces, and a cylinder is formed between the two circular end surfaces, and the cylinder part may include an electrode assembly 23 .
  • the end cap 22 covers the opening and is connected with the casing 21 to form a cavity preventing the electrode assembly 23 from being closed.
  • the casing 21 is filled with an electrolyte, such as an electrolytic solution.
  • the end cap 22 may be provided with an electrode terminal 24, and the electrode terminal 24 is electrically connected to components other than the battery cell 20.
  • the battery cell 20 may be connected at both ends, respectively.
  • the electrode assembly 23 can be set to a single, or multiple, in some embodiments of the present application, as shown in Figure 3, the battery cell 20 is provided with an electrode assembly twenty three.
  • Fig. 4 is a schematic diagram of an ear kneading device according to an embodiment of the present application.
  • the tab flattening device 400 includes a jig 30 and a sleeve assembly 50 .
  • the clamp 30 is used to clamp the cylindrical electrode assembly 23 in the radial direction.
  • the sleeve assembly 50 includes a limiting part 501 , a gathering part 502 and a pushing part 503 .
  • the gathering portion 502 is used to move along a first direction to draw the tab 201 of the electrode assembly 23 closer to the electrode assembly 23 , the first direction is parallel to the axis 231 of the electrode assembly 23 and faces the clamp 30 .
  • the limiting part 501 is connected to the first end of the gathering part 502, and the first end faces toward the clip Tool 30 , the limiting portion 501 is used to surround the electrode assembly 23 when the gathering portion 502 moves along the first direction and abut against the clamp 30 after the tab 201 is gathered.
  • the propelling part 503 is arranged at the second end of the gathering part 502, and the second end is far away from the clamp 30. The propelling part 503 is used to squeeze the tab 201 along the first direction after the tab 201 is folded, so as to knead the tab 201 to a predetermined level. Assuming the ear height, the ear height refers to the height of the tab protruding from the end surface 23a of the non-tab region of the electrode assembly 23 along the axial direction of the electrode assembly 23 .
  • the clamp 30 clamps the electrode assembly 23 in the radial direction, for example, the clamp 30 surrounds and clamps the electrode assembly 23 along the circumference of the electrode assembly 23 .
  • the clamp 30 may be a mechanical gripper or a ring-shaped jaw, as long as the electrode assembly 23 can be clamped and limited.
  • the clamp 30 can limit the position of the electrode assembly 23 , for example, the clamp 30 can limit the movement of the electrode assembly 23 in the direction of the axis 231 of the electrode assembly 23 .
  • the first direction is parallel to the axis 231 and faces the clamp 30 , as shown in FIG. 3 , the first direction may be a direction indicated by an arrow D. As shown in FIG.
  • the sleeve assembly 50 includes a limiting part 501, a gathering part 502 and a pushing part 503, wherein the pushing part 503, the gathering part 502 and the limiting part 501 are sequentially connected along the first direction, that is, the limiting part 501 and the gathering part 502 Connected towards the first end of the clamp 30 , the pushing part 503 is connected to the second end of the gathering part 502 away from the clamp 30 , wherein the distance between the first end and the clamp 30 is smaller than the distance between the second end and the clamp 30 .
  • Fig. 5 is a schematic diagram of a tab flattening device after tabs are folded according to an embodiment of the present application.
  • the propelling portion 503 is disposed at the second end of the gathering portion 502 .
  • the tab 201 is folded by the gathering part 502 to a preset gathering position, at this time, one end of the tab 201 is in contact with the pushing part 503, and the other end is aligned with the second end of the gathering part 502 and after the tabs 201 are folded, the limiting portion 501 abuts against the clamp 30 .
  • the degree of retraction of the tabs 201 that is, the preset retraction position, can be set according to actual needs, which is not specifically limited in this application.
  • FIG. 6 is a schematic diagram of tabs before and after flattening according to an embodiment of the present application.
  • the electrode assembly 23 includes an end face 23a and an end face 23b, wherein the end face 23a is the end face of one end of the non-tab region of the electrode assembly 23, and the end face 23b is the end face of one end of the electrode assembly 23 as a whole.
  • the tab 201 Before the tab 201 is flattened, the tab 201 has an initial ear height, which is equal to the vertical distance between the end surface 23a and the end surface 23b.
  • the preset ear height may be set according to actual needs, which is not limited in this embodiment of the present application.
  • the gathering part 502 moves along the first direction to draw the tab 201 closer to the axis 231; at the same time, the limiting part 501 moves along the first direction, when the tab 201 has back, The limiting portion 501 abuts against the clamp 30 . At this time, the limiting portion 501 surrounds the electrode assembly 23 .
  • the sleeve assembly 50 cooperates with the clamp 30 to limit the movement of the electrode assembly 23 along the axis 231 .
  • the propelling part 503 moves along the first direction, and squeezes the folded tab 201 to a preset ear height along the first direction.
  • the tab flattening device 400 can limit the movement of the electrode assembly 23 in the direction of the axis 231 during the extrusion process of the tab 201, so as to avoid the movement of the electrode assembly 23 that causes the tab 201 to move on the axis 231. 231 direction, so as to avoid the deviation between the preset ear height and the actual ear height after kneading caused by the offset of the tab 201 during the extrusion process, thereby improving the flattening accuracy of the tab 201.
  • the tabs are flattened by extrusion, the metal particles generated during the flattening process can be reduced, and the short circuit caused by these metal particles piercing the separator between the positive and negative electrodes can be avoided.
  • the technical solution of the embodiment of the present application can improve the quality of the flattened tab 201 while ensuring the energy density of the battery, thereby improving the performance of the battery and ensuring the safety performance of the battery.
  • Fig. 7 is a schematic diagram of a sleeve assembly according to an embodiment of the present application.
  • the gathering part 502 and the limiting part 501 are cylindrical, the diameter of the gathering part 502 gradually decreases from the first end to the second end, and the diameter of the limiting part 501 and the gathering part 502 are the same diameter at the first end.
  • the gathered portion 502 is cylindrical and its diameter gradually decreases from the first end to the second end, so that during the process of gathering the tab 201, the tab 201 gradually gathers toward the center, that is, moves closer to the axis of the electrode assembly. Folding the tab 201 before extruding the tab 201 can prevent the tab from turning out during the extrusion process, and avoid the risk of short circuit caused by the tab from turning out.
  • the gathering part 502 is in the shape of a curved cylinder.
  • the diameter of the gathering part 502 decreases uniformly and gently from the first end to the second end, and the surface of the gathering part 502 is smooth and curved. Therefore, the gathering process of the tab 201 is smoother, and the tab 201 gradually gathers toward the center, further reducing the The possibility of eversion of the tabs is reduced; in addition, the gathered tabs 201 are more uniform, which is beneficial to the subsequent extrusion process.
  • the diameter of the electrode assembly 23 is smaller than the diameter of the gathered portion 502 at the first end, and larger than the diameter of the gathered portion 502 at the second end. In this way, the electrode assembly 23 can be accommodated in the limiting portion 501 , and at the same time, the tab 201 can be folded.
  • the diameter of the limiting portion 501 is 3mm-5mm larger than the diameter of the gathering portion 502 at the second end.
  • the tab 201 can be folded within a certain range.
  • the difference between the diameter of the limiting portion 501 and the diameter of the gathering portion 502 at the second end can also be set according to actual needs, for example, the ear height of the tab is set
  • the setting is not specifically limited in this embodiment of the present application.
  • the diameter of the limiting portion 501 is 10mm-14mm larger than the diameter of the electrode assembly 23 .
  • the electrode assembly 23 can be enclosed in the limiting part 501 in a suitable range, and at the same time, the diameter of the limiting part 501 is too large to cause the electrode assembly 23 to shift in the radial direction. 23 in radial direction.
  • the propelling part 503 includes a propelling surface 5031, a propelling rod 5032 and a propelling cylinder 5033; wherein, the propelling cylinder 5033 is connected to the second end of the gathering part 502, and the diameter of the propelling cylinder 5033 is the same as that of the propelling cylinder 5033 The diameters of the parts 502 at the second end are the same; the push rod 5032 is connected to the push surface 5031 and is used to push the push surface 5031 to move in the first direction in the push barrel 5033 to squeeze the tab 201 .
  • the propelling surface 5031 is a slidable surface and can move in the propelling cylinder 5033 .
  • the propulsion rod 5032 can be a rod connecting the electric cylinder and the propulsion surface 5031 , that is, the electric cylinder drives the propulsion surface 5031 to compact the tab 201 .
  • the pushing surface 5031 moves in the pushing barrel 5033 along the first direction, so as to squeeze the folded tab 201 in the pushing barrel 5033 to a preset ear height.
  • the propulsion distance of the propelling surface 5031 can also be controlled, and the ear height of the pole ear 201 after kneading can be flexibly controlled.
  • the length of the propulsion cylinder 5033 along the first direction can be set according to actual requirements, for example, according to the ear height of the tab. For different electrode assemblies 23, tabs 201 with different ear heights may be required.
  • the propelling surface 5031 can be moved in the propulsion cylinder 5033.
  • the preset ear height of the tab 201 changes, it is not necessary to replace the tab.
  • the flat device 400 can be realized only by changing the position of the propulsion surface 5031 in the propulsion cylinder 5033.
  • the length of the clamp 30 in the first direction, is 30% to 50% of the length of the electrode assembly 23 .
  • the contact area between the clamp 30 and the electrode assembly 23 is reduced, which is beneficial to improving the roundness of the electrode assembly 23 and reducing the deformation of the electrode assembly 23 along the radial direction.
  • the first surface of the clamp 30 is provided with an anti-slip structure 301, and the anti-slip structure 301 is used to increase the frictional force between the electrode assembly 23 and the clamp 30 along the first direction, wherein the second One surface is the surface where the jig 30 is in contact with the electrode assembly 23 .
  • the frictional force between the clamp 30 and the electrode assembly 23 along the first direction can be increased, and the stability of the electrode assembly 23 in the axial direction during the pressing process of the tab 201 is enhanced.
  • the anti-skid structure 301 is rubber particles.
  • the rubber particles are evenly distributed on the first surface of the clamp 30 , so that the friction force between the electrode assembly 23 and the clamp 30 is more uniform, which is beneficial to limit the electrode assembly 23 in the first direction.
  • the clamp 30 has an abutment surface perpendicular to the first direction, The abutting surface is used to abut against the limiting portion 501 .
  • the limiting portion 501 is in surface contact with the clamp 30 , which increases the abutting force between the limiting portion 501 and the clamp 30 , which is beneficial to maintaining the stability of the sleeve assembly 50 .
  • the sum of the lengths of the limiting portion 501 and the gathering portion 502 is less than half of the difference between the length of the electrode assembly 23 before flattening and the length of the jig 30 one. In this way, the ear can be squeezed from the initial ear height to the preset ear height.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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Abstract

一种极耳揉平装置，包括夹具(30)和套筒组件(50)。夹具用于沿径向夹持电极组件(23)。套筒组件包括收拢部(502)、限位部(501)和推进部(503)。收拢部用于沿第一方向移动以使电极组件的极耳(201)向靠近电极组件的方向收拢，第一方向平行于电极组件的轴线(231)且朝向夹具。限位部与收拢部的第一端连接，第一端朝向夹具，限位部用于在收拢部沿第一方向移动时包围电极组件并在极耳收拢后抵接至夹具。推进部设置于收拢部的第二端，第二端远离夹具，推进部用于在极耳收拢后沿第一方向挤压极耳，以将极耳揉平至预设耳高，耳高是指极耳沿电极组件轴向突出于电极组件的非极耳区的端面(23a)的高度。该装置可以防止在挤压极耳的过程中电极组件沿其轴向移动，以防止极耳的轴向偏移而导致的极耳的实际耳高与预设耳高的偏差，提高揉平极耳的质量，进而能够提升电池的性能并保证安全性能。

Description

极耳揉平装置
相关申请的交叉引用
本申请要求享有于2022年2月28日提交的名称为“极耳揉平装置”的中国专利申请202210187360.1的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本申请涉及电池领域，更为具体地，涉及一种极耳揉平装置。
背景技术
随着环境污染的日益加剧，新能源产业越来越受到人们的关注。在新能源产业中，电池技术是关乎其发展的一项重要因素。
能量密度是电池性能的重要指标之一，对电池的电极组件上的极耳进行揉平，能够有效地降低极耳的空间占比率，从而提高电池的能量密度。同时，揉平极耳可能会导致极耳的外翻不收拢而发生短路，或者，揉平过程中由于摩擦产生金属颗粒影响电池的性能甚至引发安全问题等。因此，揉平极耳的工艺和揉平后的质量直接影响了电极组件的质量和安全性。因此，如何提供一种极耳揉平装置，在保证电池的能量密度的同时提高揉平极耳的质量从而提升电池的性能并保证安全性能，是电池技术中一个亟待解决的问题。
发明内容
本申请提供了一种极耳揉平装置，在保证电池的能量密度的同时提高揉平极耳的质量，从而提升电池的性能，保障电池的安全。
本申请提供了一种极耳揉平装置，包括：夹具，所述夹具用于沿径向夹持圆柱形电极组件；套筒组件，包括：收拢部，所述收拢部用于沿第一方向移动以使所述电极组件的极耳向靠近所述电极组件的方向收拢，所述第一方向平行于所述电极组 件的轴线且朝向所述夹具；限位部，所述限位部与所述收拢部的第一端连接，所述第一端朝向所述夹具所述限位部与所述收拢部的朝向所述夹具的一端连接，所述限位部用于在所述收拢部沿所述第一方向移动时包围所述电极组件并在所述极耳收拢后抵接至所述夹具；推进部，所述推进部设置于所述收拢部的第二端，所述第二端远离所述夹具推进部设置于所述收拢部的远离所述夹具的一端，所述推进部用于在所述极耳收拢后沿所述第一方向挤压所述极耳，以将所述极耳揉平至预设耳高，所述耳高是指极耳沿所述电极组件轴向突出于电极组件的非极耳区的端面的高度。
在本申请的实施例中，夹具用于夹持电极组件，套筒组件用于揉平极耳。通过收拢部将极耳收拢至预设位置，之后再通过限位部包围电极组件并且与夹具抵接，这样将电极组件在轴向方向上固定，从而有利于推进部挤压极耳至预设耳高。通过上述设置，可以防止在挤压极耳的过程中电极组件沿其轴向移动，以防止极耳的轴向偏移而导致的极耳的实际耳高与预设耳高的偏差，进而提高极耳的揉平精度。同时，由于采用挤压的方式进行极耳揉平，可以减少揉平过程中极耳产生的金属颗粒，避免这些金属颗粒刺破正极片和负极片之间的隔离膜而导致的短路，同时也可以避免金属颗粒造成的电池的自放电异常进而导致的电池容量下降、电压不足等问题。因此，本申请实施例的技术方案能够在保证电池的能量密度的同时提高揉平极耳的质量，从而提升电池的性能并保证电池的安全性能。
在一种可能的实现方式中，所述收拢部和所述限位部为筒状，所述收拢部的直径从所述第一端到所述第二端逐渐减小，所述限位部的直径与所述收拢部在所述第一端处的直径相同。这样，收拢后的极耳会逐渐向中心收聚，即向电极组件的轴线靠拢。在挤压极耳前收拢极耳可以避免挤压过程中出现极耳外翻的情况，避免了因极耳外翻导致的短路风险。
在一种可能的实现方式中，所述收拢部为曲面筒状。这样，在极耳收拢过程更加平滑，极耳逐渐向中心收聚，进一步减小了极耳外翻的可能；此外，收拢后的极耳更加均匀，有利于后续挤压过程的进行。
在一种可能的实现方式中，所述电极组件的直径小于所述收拢部在所述第一端处的直径大于所述收拢部在所述第二端处的直径。这样，电极组件可以容纳在限位部中，同时能够实现极耳的收拢。
在一种可能的实现方式中，所述限位部的直径比所述收拢部在所述第二端处的直径大3mm-5mm。这样，极耳可以在一定的范围内收拢。
在一种可能的实现方式中，所述限位部的直径比揉平前的所述电极组件的直径大10mm-14mm。这样，可以将电极组件以合适的范围包围在限位部中，同时避免限位部的直径过大导致电极组件在径向上的偏移，即，限位部实现对电极组件在径向上的限位。
在一种可能的实现方式中，所述推进部包括推进面，推进杆和推进筒；其中，所述推进筒与所述收拢部的所述第二端连接，所述推进筒的直径与所述收拢部在所述第二端处的直径相同；所述推进杆连接所述推进面并用于推动所述推进面在所述推进筒中沿所述第一方向移动，以挤压所述极耳。这样，在推进杆的作用下，推进面在推进筒中沿第一方向移动，以将收拢后的位于推进筒中的极耳挤压至预设耳高。此外，还可以控制推进面的推进距离，灵活控制揉平后极耳的耳高。
在一种可能的实现方式中，在所述第一方向上，所述夹具的长度为揉平前的所述电极组件的长度的30％至50％。这样，夹具与电极组件的接触面积减小，有利于改善电极组件的圆度，减小电极组件沿径向方向的变形。
在一种可能的实现方式中，所述夹具的第一表面设置有防滑结构，所述防滑结构用于增大所述电极组件与所述夹具之间沿所述第一方向的摩擦力，其中，所述第一表面为所述夹具与所述电极组件接触的表面。这样，可以增大夹具与电极组件沿第一方向的摩擦力，增强了极耳挤压过程中的电极组件沿轴向的稳定性。
在一种可能的实现方式中，所述防滑结构为橡胶颗粒。例如，橡胶颗粒均匀的分布在夹具的第一表面上，使得电极组件与夹具之间的摩擦力更加均匀，有利于在第一方向上对电极组件进行限位。
在一种可能的实现方式中，所述夹具具有垂直于所述第一方向的抵接面，所述抵接面用于抵接所述限位部。这样，限位部与夹具为面接触，增大了抵接部与夹具之间的抵接力，有利于维持套筒组件的稳定性。
在一种可能的实现方式中，沿所述第一方向，所述限位部与所述收拢部的长度之和小于揉平前的所述电极组件的长度与所述夹具的长度之差的二分之一。这样，可以将极耳从初始状态挤压至预设耳高。
在本申请的实施例中，夹具用于夹持电极组件，套筒组件用于揉平极耳。通过收拢部将极耳收拢至预设位置，之后再通过限位部包围电极组件并且与夹具抵接，这样将电极组件在轴向方向上固定，从而有利于推进部挤压极耳至预设耳高。通过上述设置，可以防止在挤压极耳的过程中电极组件沿其轴向移动，以防止极耳的轴向偏移而导致的极耳的实际耳高与预设耳高的偏差，进而提高极耳的揉平精度。同时，由于采用挤压的方式进行极耳揉平，可以减少揉平过程中极耳产生的金属颗粒，避免这些金属颗粒刺破正极片和负极片之间的隔离膜而导致的短路，同时也可以避免金属颗粒造成的电池的自放电异常进而导致的电池容量下降、电压不足等问题。因此，本申请实施例的技术方案能够在保证电池的能量密度的同时提高揉平极耳的质量，从而提升电池的性能并保证电池的安全性能。
附图说明
图1是本申请一实施例的车辆的示意图；
图2是本申请一实施例的电池的示意图；
图3是本申请一实施例的电池单体的示意图；
图4是本申请一实施例的极耳揉平装置的示意图；
图5是本申请一实施例的极耳收拢后的极耳揉平装置的示意图；
图6是本申请一实施例的揉平前和揉平后的极耳的示意图；
图7是本申请一实施例的套筒组件的示意图。
具体实施方式
下面将结合附图，对本申请实施例中的技术方案进行描述。以下实施例仅用于更加清楚地说明本申请的技术方案，因此只作为示例，而不能以此来限制本申请的保护范围。
以下实施例的详细描述和附图用于示例性地说明本申请的原理，但不能用来限制本申请的范围，即本申请不限于所描述的实施例。
在本申请的描述中，需要说明的是，除非另有说明，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；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；“多个”的含义是两个以上；术语“上”、“下”、“左”、“右”、“内”、“外”等指示的方位或位置关系仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”、“第三”等仅用于描述目的，而不能理解为指示或暗示相对重要性。“垂直”并不是严格意义上的垂直，而是在误差允许范围之内。“平行”并不是严格意义上的平行，而是在误差允许范围之内。
在本申请中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本申请的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本申请所描述的实施例可以与其它实施例相结合。
下述描述中出现的方位词均为图中示出的方向，并不是对本申请的具体结构进行限定。在本申请的描述中，还需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是直接相连，也可以通过中间媒介间接相连，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。
本申请中，电池单体可以包括锂离子二次电池、锂离子一次电池、锂硫电池、钠锂离子电池、钠离子电池或镁离子电池等，本申请实施例对此并不限定。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电能的物理模块。例如，本申请中所提到的电池可以包括电池包等。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，电极组件由正极片、负极片和隔离膜组 成。电池单体主要依靠金属离子在正极片和负极片之间移动来工作。正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，未涂敷正极活性物质层的集流体凸出于已涂覆正极活性物质层的集流体，未涂敷正极活性物质层的集流体作为正极极耳。以锂离子电池为例，正极集流体的材料可以为铝，正极活性物质可以为钴酸锂、磷酸铁锂、三元锂或锰酸锂等。负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，未涂敷负极活性物质层的集流体凸出于已涂覆负极活性物质层的集流体，未涂敷负极活性物质层的集流体作为负极极耳。负极集流体的材料可以为铜，负极活性物质可以为碳或硅等。隔离膜的材质可以为聚丙烯(PP)或聚乙烯(PE)等。
为了满足不同的电力需求，电池中的多个电池单体之间可以串联、并联或混联，其中混联是指串联和并联的混合。可选地，多个电池单体可以先串联、并联或混联组成电池模块，多个电池模块再串联、并联或混联组成电池。也就是说，多个电池单体可以直接组成电池，也可以先组成电池模块，电池模块再组成电池。电池再进一步设置于用电设备中，为用电设备提供电能。
目前，从市场形势的发展来看，动力电池的应用越加广泛。动力电池不仅被应用于水力、火力、风力和太阳能电站等储能电源系统，而且还被广泛应用于电动自行车、电动摩托车、电动汽车等电动交通工具，以及军事装备和航空航天等多个领域。随着动力电池应用领域的不断扩大，其市场的需求量也在不断地扩增。其中，圆柱形电池的应用也越来越广泛。
在圆柱形电池的生产过程中，一个重要的工序就是制备极耳。对于全极耳结构的圆柱形电池，在对正、负集流体涂布正极活性物质层和负极活性物质层时，正、负集流体的边缘处留有一片空箔区，该空箔区作为极耳。涂布完成后，将正、负集流体卷绕，并将空箔区，即极耳，揉平。在极耳的揉平过程中，会出现极耳外翻、极耳表面出现金属颗粒、极耳预设高度与实际高度不同等现象，这些现象的产生均会影响极耳的质量，进而影响电池性能。
基于以上考虑，本申请提供了一种极耳揉平装置，包括夹具和套筒组件，夹具与套筒组件中的限位部相互配合可以将电极组件在其轴向方向上限位，在极耳的揉平过程中，限制电极组件的移动，提高了揉平后的极耳高度的精度；套筒组件中的收拢部可以将极耳收拢，以便套筒组件中的推进部挤压收拢后的极耳，从而避免了揉 平过程中极耳外翻导致的短路，同时，极耳的揉平是通过挤压实现的，减少了揉平过程中金属颗粒的产生，避免了自放电异常等现象的发生。因此，本申请实施例的技术方案能够提升极耳的质量，从而提升电池的性能。
本申请实施例描述的技术方案均适用于圆柱形电池单体，该圆柱形电池单体适用于各种使用电池的装置，例如，手机、便携式设备、笔记本电脑、电瓶车、电动玩具、电动工具、电动车辆、船舶和航天器等，例如，航天器包括飞机、火箭、航天飞机和宇宙飞船等。
应理解，本申请实施例描述的技术方案不仅仅局限适用于上述所描述的设备，还可以适用于所有使用电池的设备，但为描述简洁，下述实施例均以电动车辆为例进行说明。
例如，如图1所示，图1为本申请一个实施例的一种车辆1的结构示意图。车辆1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1的内部可以设置马达40，控制器60以及电池10，控制器60用来控制电池10为马达40的供电。例如，在车辆1的底部或车头或车尾可以设置电池10。电池10可以用于车辆1的供电，例如，电池10可以作为车辆1的操作电源，用于车辆1的电路系统，例如，用于车辆1的启动、导航和运行时的工作用电需求。在本申请的另一实施例中，电池10不仅仅可以作为车辆1的操作电源，还可以作为车辆1的驱动电源，替代或部分地替代燃油或天然气为车辆1提供驱动动力。
为了满足不同的使用电力需求，电池10可以包括多个电池单体。例如，如图2所示，为本申请一个实施例的一种电池10的结构示意图，电池10可以包括多个电池单体20。电池10还可以包括箱体11，箱体11内部为中空结构，多个电池单体20容纳于箱体11内。例如，多个电池单体20相互并联或串联或混联组合后置于箱体11内。箱体11可以包括第一箱体部111和第二箱体部112，只要能够容纳电池单体即可，此处不作具体限制。
可选地，电池10还可以包括其他结构，在此不再一一赘述。例如，该电池10还可以包括汇流部件，汇流部件用于实现多个电池单体20之间的电连接，例如并联或串联或混联。具体地，汇流部件可通过连接电池单体20的电极端子实现电池单体20之间的电连接。进一步地，汇流部件可通过焊接固定于电池单体20的电极端子。多个电池单体20的电能可进一步通过导电机构穿过箱体而引出。可选地，导电机构也可属 于汇流部件。
根据不同的电力需求，电池单体20的数量可以设置为任意数值。多个电池单体20可通过串联、并联或混联的方式连接以实现较大的容量或功率。由于每个电池10中包括的电池单体20的数量可能较多，为了便于安装，可以将电池单体20分组设置，每组电池单体20组成电池模块。电池模块中包括的电池单体20的数量不限，可以根据需求设置。电池可以包括多个电池模块，这些电池模块可通过串联、并联或混联的方式进行连接。
如图3所示，为本申请一个实施例的一种电池单体20的结构示意图。电池单体20包括壳体21、端盖22和电极组件23。壳体21和端盖22形成外壳或电池盒，壳体21的壁和端盖22的壁均称为电池单体20的壁。壳体21根据一个或多个电极组件23组合后的形状而定。例如，壳体21可以为图3所示的中空的圆柱体，或者，若电池单体20为刀片式电池单体，壳体21可以为长度较长的长方体。并且壳体21的至少一个面具有开口以便一个或多个电极组件23放置于壳体21内。例如，当壳体21为中空的圆柱体时，壳体21的端面为开口面，即该端面不具有壁体而使得壳体21内外相通。从图3可以看出，圆柱形电池单体具有两个圆形端面，该两个圆形端面之间为柱体，柱体部分可以包括电极组件23。端盖22覆盖开口并且与壳体21连接，以形成防止电极组件23的封闭的腔体。壳体21内填充有电解质，例如电解液。
端盖22上可以设置有电极端子24，由电极端子24与电池单体20以外的部件进行电连接，可选地，如本申请的实施例中所示，电池单体20在两端可以分别具有一个电极端子24，电极端子24可以为端盖22形成的突出部222；又或者，也可以将电池单体20的其中一端为上述结构，另一端可以由壳体21或极柱形成的电极端子24实现电连接。
在该电池单体20中，根据实际使用需求，电极组件23可设置为单个，或多个，在本申请的一些实施例中，如图3所示，电池单体20内设置有一个电极组件23。
图4为本申请一个实施例的极耳揉平装置的示意图。如图4所示，极耳揉平装置400包括夹具30和套筒组件50。夹具30用于沿径向夹持圆柱形电极组件23。套筒组件50包括限位部501，收拢部502和推进部503。收拢部502用于沿第一方向移动以使电极组件23的极耳201向靠近电极组件23的方向收拢，第一方向平行于电极组件23的轴线231且朝向夹具30。限位部501与收拢部502的第一端连接，第一端朝向夹 具30，限位部501用于在收拢部502沿第一方向移动时包围电极组件23并在极耳201收拢后抵接至夹具30。推进部503设置于收拢部502的第二端，第二端远离夹具30，推进部503用于在极耳201收拢后沿第一方向挤压极耳201，以将极耳201揉平至预设耳高，该耳高是指极耳沿电极组件23轴向突出于电极组件23的非极耳区的端面23a的高度。
夹具30沿径向夹持电极组件23，例如，夹具30沿电极组件23的周向包围并夹持电极组件23。夹具30可以为机械抓手，也可以为环状夹爪，只要能够实现对电极组件23的夹持以及限位即可。夹具30可以实现对电极组件23的限位，例如，夹具30可以限制电极组件23在电极组件23的轴线231方向上的移动。
第一方向平行于轴线231并且朝向夹具30，如图3所示，第一方向可以为箭头D所示的方向。
套筒组件50括限位部501，收拢部502和推进部503，其中，推进部503，收拢部502和限位部501沿第一方向依次连接，也即，限位部501与收拢部502朝向夹具30的第一端连接，推进部503与收拢部502远离夹具30的第二端连接，其中，第一端与夹具30之间的距离小于第二端与夹具30之间的距离。
图5为本申请一个实施例的极耳收拢后的极耳揉平装置的示意图。如图5所示，推进部503设置于收拢部502的第二端。可选的，在一实施例中，极耳201被收拢部502收拢至预设的收拢位置，此时，极耳201的一端与推进部503接触，另一端与收拢部502的第二端对齐；并且极耳201收拢完成后，限位部501与夹具30抵接。极耳201的收拢程度，即预设的收拢位置，可以根据实际需求进行设定，本申请对此不作具体限制。
图6为本申请一个实施例的揉平前和揉平后的极耳的示意图。如图6所示，电极组件23包括端面23a和端面23b，其中，端面23a为电极组件23的非极耳区的一端的端面，端面23b为电极组件23整体的一端的端面。在对极耳201进行揉平前，极耳201具有一个初始耳高，该耳高的大小等于端面23a和端面23b之间的垂直距离。当极耳201揉平后，即，极耳被揉平至预设耳高，此时预设耳高小于初始耳高。其中，预设耳高可以根据实际需求进行设定，本申请实施例对此不作限制。
在极耳201的揉平过程中，收拢部502沿第一方向移动，以将极耳201向靠近轴线231的方向收拢；同时，限位部501沿第一方向移动，当极耳201完成收拢后， 限位部501与夹具30抵接，此时限位部501包围电极组件23，套筒组件50与夹具30相互配合以限制电极组件23沿轴线231移动。之后，推进部503沿第一方向移动，将收拢后的极耳201沿第一方向挤压至预设耳高。
在本申请实施例中，极耳揉平装置400可以在极耳201的挤压过程中，限制电极组件23在轴线231方向上的移动，避免因电极组件23的移动而导致极耳201在轴线231方向上的移动，从而避免极耳201在挤压过程中发生偏移导致的预设耳高与揉平后的实际耳高的偏差，进而提高了极耳201的揉平精度。此外，由于采用挤压的方式进行极耳揉平，可以减少揉平过程中极耳产生的金属颗粒，避免这些金属颗粒刺破正极片和负极片之间的隔离膜而导致的短路，同时也可以避免金属颗粒造成的电池的自放电异常进而导致的电池容量下降、电压不足等问题。因此，本申请实施例的技术方案能够在保证电池的能量密度的同时提高揉平极耳201的质量，从而提升电池的性能并保证电池的安全性能。
图7为本申请一个实施例的套筒组件的示意图。可选的，在本申请一个实施例中，收拢部502和限位部501为筒状，收拢部502的直径从第一端到第二端逐渐减小，限位部501的直径与收拢部502在第一端处的直径相同。
收拢部502为筒状并且直径从第一端到第二端逐渐减小，这样，在收拢极耳201的过程中，极耳201逐渐向中心收聚，即向电极组件的轴线靠拢。在挤压极耳201前收拢极耳201可以避免挤压过程中出现极耳外翻的情况，避免了因极耳外翻导致的短路风险。
可选的，在本申请一个实施例中，收拢部502为曲面筒状。收拢部502的直径从第一端到第二端均匀平缓的减小，收拢部502的表面呈光滑曲面状，因此，极耳201收拢过程更加平滑，极耳201逐渐向中心收聚，进一步减小了极耳外翻的可能；此外，收拢后的极耳201更加均匀，有利于后续挤压过程的进行。
可选的，在本申请一个实施例中，电极组件23的直径小于收拢部502在第一端处的直径，大于收拢部502在第二端处的直径。这样，电极组件23可以容纳在限位部501中，同时可以实现极耳201的收拢。
可选的，在本申请一个实施例中，限位部501的直径比收拢部502在第二端处的直径大3mm-5mm。这样，极耳201可以在一定的范围内收拢。限位部501的直径与收拢部502在第二端处的直径之间的差值也可以根据实际需求，例如，极耳的耳高设 置，本申请实施例对此不作具体限制。
可选的，在本申请一个实施例中，限位部501的直径比电极组件23的直径大10mm-14mm。这样，可以将电极组件23以合适的范围包围在限位部501中，同时避免限位部501的直径过大导致电极组件23在径向上的偏移，即，限位部501实现对电极组件23在径向上的限位。
可选的，在本申请一个实施例中，推进部503包括推进面5031，推进杆5032和推进筒5033；其中，推进筒5033与收拢部502的第二端连接，推进筒5033的直径与收拢部502在第二端处的直径相同；推进杆5032连接推进面5031并用于推动推进面5031在推进筒5033中沿第一方向移动，以挤压极耳201。
推进面5031为可滑移面，可以在推进筒5033中移动。推进杆5032可以为连接电动气缸与推进面5031的杆，即，通过电动气缸带动推进面5031将极耳201压实。这样，在推进杆5032的作用下，推进面5031在推进筒5033中沿第一方向移动，以将收拢后的位于推进筒5033中的极耳201挤压至预设耳高。此外，还可以控制推进面5031的推进距离，灵活控制揉平后极耳201的耳高。
推进筒5033沿第一方向的长度可以根据实际需求进行设置，例如根据极耳的耳高设置。对于不同的电极组件23，可能需要不同的耳高的极耳201，通过设置推进面5031可在推进筒5033内移动，当极耳201的预设耳高发生改变时，可以不用更换极耳揉平装置400，只需改变推进面5031在推进筒5033中的位置即可实现。
可选的，在本申请一个实施例中，在第一方向上，夹具30的长度为电极组件23的长度的30％至50％。这样，夹具30与电极组件23的接触面积减小，有利于改善电极组件23的圆度，减小电极组件23沿径向方向的变形。
可选的，在本申请一个实施例中，夹具30的第一表面设置有防滑结构301，防滑结构301用于增大电极组件23与夹具30之间沿第一方向的摩擦力，其中，第一表面为夹具30与电极组件23接触的表面。这样，可以增大夹具30与电极组件23沿第一方向的摩擦力，增强了极耳201挤压过程中的电极组件23沿轴向的稳定性。
可选的，在本申请一个实施例中，防滑结构301为橡胶颗粒。例如，橡胶颗粒均匀的分布在夹具30的第一表面上，使得电极组件23与夹具30之间的摩擦力更加均匀，有利于在第一方向上对电极组件23进行限位。
可选的，在本申请一个实施例中，夹具30具有垂直于第一方向的抵接面， 该抵接面用于抵接限位部501。这样，限位部501与夹具30为面接触，增大了限位部501与夹具30之间的抵接力，有利于维持套筒组件50的稳定性。
可选的，在本申请一个实施例中，沿第一方向，限位部501与收拢部502的长度之和小于揉平前的电极组件23的长度与夹具30的长度之差的二分之一。这样，可以实现将极耳从初始耳高挤压至预设耳高。
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 (11)

  1. 一种极耳揉平装置，包括：
    夹具(30)，所述夹具(30)用于沿径向夹持电极组件(23)；
    套筒组件(50)，包括：
    收拢部(502)，所述收拢部(502)用于沿第一方向移动以使所述电极组件(23)的极耳(201)向靠近所述电极组件(23)的方向收拢，所述第一方向平行于所述电极组件(23)的轴线(231)且朝向所述夹具(30)；
    限位部(501)，所述限位部(501)与所述收拢部(502)的第一端连接，所述第一端朝向所述夹具(30)，所述限位部(501)用于在所述收拢部(502)沿所述第一方向移动时包围所述电极组件(23)并在所述极耳(201)收拢后抵接至所述夹具(30)；
    推进部(503)，所述推进部(503)设置于所述收拢部(502)的第二端，所述第二端远离所述夹具(30)，所述推进部(503)用于在所述极耳(201)收拢后沿所述第一方向挤压所述极耳(201)，以将所述极耳(201)揉平至预设耳高，所述耳高是指极耳沿所述电极组件(23)轴向突出于电极组件(23)的非极耳区的端面(23a)的高度。
  2. 根据权利要求1所述的极耳揉平装置，其中，所述收拢部(502)和所述限位部(501)为筒状，所述收拢部(502)的直径从所述第一端到所述第二端逐渐减小，所述限位部(501)的直径与所述收拢部(502)在所述第一端处的直径相同。
  3. 根据权利要求2所述的极耳揉平装置，其中，所述收拢部(502)为曲面筒状。
  4. 根据权利要求2至3中任一项所述的极耳揉平装置，其中，所述限位部(501)的直径比所述收拢部(502)在所述第二端处的直径大3mm-5mm。
  5. 根据权利要求1至4中任一项所述的极耳揉平装置，其中，所述推进部(503)包括推进面(5031)，推进杆(5032)和推进筒(5033)；其中，
    所述推进筒(5033)与所述收拢部(502)的所述第二端连接，所述推进筒(5033)的直径与所述收拢部(502)在所述第二端处的直径相同；
    所述推进杆(5032)连接所述推进面(5031)并用于推动所述推进面(5031)在所述推进筒(5033)中沿所述第一方向移动，以挤压所述极耳(201)。
  6. 根据权利要求1至5中任一项所述的极耳揉平装置，其中，所述夹具(30)的第一表面设置有防滑结构(301)，所述防滑结构(301)用于增大所述电极组件(23)与所述夹具(30)之间沿所述第一方向的摩擦力，其中，所述第一表面为所述夹具(30)与所述电极组件(23)接触的表面。
  7. 根据权利要求6所述的极耳揉平装置，其中，所述防滑结构(301)为橡胶颗粒。
  8. 根据权利要求1至7中任一项所述的极耳揉平装置，其中，所述夹具(30)具有垂直于所述第一方向的抵接面，所述抵接面用于抵接所述限位部(501)。
  9. 根据权利要求1至8中任一项所述的极耳揉平装置，其中，沿所述第一方向，所述限位部(501)与所述收拢部(502)的长度之和小于揉平前的所述电极组件(23)的长度与所述夹具(30)的长度之差的二分之一。
  10. 根据权利要求1至9中任一项所述的极耳揉平装置，其中，沿所述第一方向，所述夹具(30)的长度为所述电极组件(23)的长度的30％-50％。
  11. 根据权利要求1至10中任一项所述的极耳揉平装置，其中，所述限位部(501)的直径比所述电极组件(23)的直径大10mm-14mm。
PCT/CN2023/078481 2022-02-28 2023-02-27 极耳揉平装置 WO2023160707A1 (zh)

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