WO2023029130A1 - 电芯、电池、电芯的制造方法及电子设备 - Google Patents

电芯、电池、电芯的制造方法及电子设备 Download PDF

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Publication number
WO2023029130A1
WO2023029130A1 PCT/CN2021/120428 CN2021120428W WO2023029130A1 WO 2023029130 A1 WO2023029130 A1 WO 2023029130A1 CN 2021120428 W CN2021120428 W CN 2021120428W WO 2023029130 A1 WO2023029130 A1 WO 2023029130A1
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WO
WIPO (PCT)
Prior art keywords
tab
bending
area
battery
battery cell
Prior art date
Application number
PCT/CN2021/120428
Other languages
English (en)
French (fr)
Inventor
张静
Original Assignee
东莞新能德科技有限公司
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Publication date
Application filed by 东莞新能德科技有限公司 filed Critical 东莞新能德科技有限公司
Priority to EP21870537.4A priority Critical patent/EP4170780A4/en
Priority to US17/710,575 priority patent/US20230061397A1/en
Publication of WO2023029130A1 publication Critical patent/WO2023029130A1/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
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/519—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising printed circuit boards [PCB]
    • 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
    • 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
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present application relates to the technical field of electrochemistry, and in particular to an electric cell, a battery, a manufacturing method of the electric cell, and electronic equipment.
  • the folded top-sealed battery is currently a more popular type of battery.
  • the top seal of the battery is bent and fixed to one end of the battery.
  • the tabs of the battery are also bent to facilitate electrical connection to the circuit board.
  • the gap between the tab and the top seal is In order to ensure the sealing effect of the top seal at the protruding position of the tab and to avoid contact between the tab and the exposed aluminum layer of the top seal, the tab glue generally protrudes from the top seal by a certain length, and Limited by the existing production technology level, the length of the protruding top seal part of the ear glue is often more than 1mm. Due to the high hardness of the ear glue, it is not only difficult to bend, but also the length occupied in the battery length direction after bending It is also large, resulting in waste of space in the battery length direction, which is not conducive to reducing the packaging space of the battery cell and increasing the battery capacity.
  • the embodiments of the present application provide a battery cell, a battery, a manufacturing method of the battery cell, and an electronic device, which improve the bending difficulty of the ear glue and reduce the length occupied by the battery in the length direction of the battery after bending.
  • an embodiment of the present application provides a battery cell, including: a packaging bag, an electrode assembly, tabs, and tab glue.
  • the packaging bag includes a main body and a top seal.
  • the main body includes a bottom wall, a side wall and a top wall. The side walls are respectively connected to the bottom wall and the top wall.
  • the top seal is connected to the top wall and bent toward the top wall; the electrode assembly accommodates In the main part; one end of the tab is electrically connected to the electrode assembly, and the other end of the tab extends out of the top seal; the tab glue is located between the tab and the top seal; the tab glue includes an exposed part extending out of the top seal , the exposed part is provided with a bending line, and the bending line is perpendicular to the extending direction of the tab on the tab glue; optionally, along the extending direction of the tab, the bending line is arranged opposite to the top sealing part.
  • the bending line can reduce the bending difficulty of the ear glue, and the length of the battery cell in the direction of the battery cell length can be reduced after the exposed part is bent, which is beneficial to increase the capacity of the battery cell.
  • the stress required for bending the tab glue at the bending line is smaller than the stress required for bending at other positions, which facilitates the bending of the tab glue.
  • the exposed part is provided with a void area and/or a thinned area, and the void area and/or the thinned area is used for the tab to be bent.
  • the void area and/or the thinned area The area forms a bend line on the tab glue.
  • the exposed portion includes a first portion and a second portion oppositely disposed along the extending direction of the tab, and the bending line is disposed between the first portion and the second portion.
  • the second part can increase the area of the tab covered by the tab glue, reduce the exposed part of the tab, and is beneficial to protect the tab.
  • the escape area and/or the thinned area are continuously distributed on the exposed portion perpendicular to the extending direction of the tab.
  • the avoidance area and/or the thinning area are continuously distributed between the first bending area and the second bending area, which can be regarded as the avoidance area and/or the thinning area along the third direction (for example, the third direction is perpendicular to the pole Ear extension direction) runs through the bending area, which is beneficial to reduce the difficulty of preparing the empty area and/or the thinning area.
  • the avoidance regions and/or thinning regions are distributed at intervals on the exposed portion perpendicular to the extending direction of the tabs.
  • the first part and the second part are still connected without disconnection, which is beneficial to improve the structural strength of the exposed part and protect the tabs; in addition, after bending, the gap between the tabs and the circuit board and the cutout of the top sealing part can be reduced.
  • the risk of electrical contact of aluminum-plastic film reduces the safety risk caused by short circuit.
  • the exposed portion includes a first part and a second part that are oppositely arranged along the extending direction of the tab; along the direction perpendicular to the extending direction of the tab, on at least one side of the tab, the length of the first part is smaller than the length of the second part . It can reduce the risk that the burrs and the like of the exposed part at the fracture site after bending (that is, the edge of the bending line) will puncture the sealing tape.
  • the length difference between the second part and the first part is D 0 , and 0.5mm ⁇ D 0 ⁇ 3.0mm.
  • the length of the exposed portion is H 0 , and 0.2mm ⁇ H 0 ⁇ 3.0mm.
  • the length of the top seal portion is H 2 , and 1.0mm ⁇ H 2 ⁇ 4.0mm.
  • the bending line is disposed on one side of the exposed portion located on the tab. That is, on one side of the tab, the tab glue is provided with a bending line, while on the other side of the tab, the tab glue is not provided with a bending line, which can not only reduce the bending difficulty of the tab glue, but also set the bending line
  • the tab glue facing the top seal can reduce the risk of electrical contact between the tab and the circuit board and the aluminum-plastic film of the cutout of the top seal, reducing Safety risk due to short circuit.
  • the embodiments of the present application provide a method for manufacturing a battery cell, which is used to manufacture the battery cell described in any one of the above, the method includes: placing the battery cell encapsulated by tab glue on the positioning device Positioning, wherein the tab glue is located between the tab and the top seal of the battery; cutting the tab glue along the width direction of the tab with a laser to form a bend line on the tab glue, optionally, the bend line
  • the avoidance area and/or the thinning area are included, and the avoidance area and/or the thinning area are used for bending and setting of tabs.
  • the lug glue is cut with a continuous laser having the first energy to form continuously distributed void areas on the lug glue.
  • the lug glue is cut with a first energy intermittent laser to form space-distributed void areas on the lug glue.
  • the tab glue is cut with a laser having a second energy, which is less than the first energy, to form a thinned region on the tab glue.
  • the laser is a carbon dioxide laser; the pulse width of the laser is 10 ns to 500 ns, the frequency is 500 KHz to 2000 KHz, and the moving speed of the laser is 20 mm/s to 50 mm/s.
  • the embodiments of the present application provide a battery, including: a packaging bag, an electrode assembly, tabs, tab glue, and a circuit board.
  • the packaging bag includes a main body and a top seal.
  • the main body includes a bottom wall, a side wall and a top wall. The side walls are respectively connected to the bottom wall and the top wall.
  • the top seal is connected to the top wall and bent toward the top wall; the electrode assembly It is accommodated in the main body; one end of the tab is electrically connected to the electrode assembly, and the other end of the tab extends out of the top seal; the circuit board is arranged on the side of the top seal facing away from the electrode assembly, and the tab of the circuit board and the cell Electrical connection; the tab glue is located between the tab and the top seal; the tab glue includes an exposed portion extending out of the top seal, the exposed portion is provided with a bending area, and the tab is bent in the bending area.
  • the exposed part of the tab glue can be bent along with the bending of the tab, and the length of the tab glue in the direction of the cell length can be reduced after the tab is bent, which is beneficial to increase the capacity of the cell.
  • the exposed portion includes a first subsection and a second subsection, the first subsection is connected to the top seal portion and extends along a first direction, and the second subsection is connected to the circuit board and extends along the opposite direction of the first direction. extending in the direction, the bending zone connects the first sub-section and the second sub-section.
  • the stress required for bending the tab glue at the bending region is smaller than the stress required for bending at other locations.
  • the bending zone is provided with a void and/or a thinning zone.
  • the bending zone includes a first bending zone and a second bending zone oppositely disposed along the second direction, and the bending line is disposed between the first bending zone and the second bending zone.
  • the avoidance area and/or the thinning area are continuously distributed in the bending area along a third direction, and the third direction is perpendicular to the first direction and the second direction.
  • the avoidance zone and/or thinning zone are continuously distributed between the first bending zone and the second bending zone, which can be regarded as the avoidance zone and/or thinning zone running through the bending zone along the third direction, which is beneficial to reduce Difficulty in preparation of voids and/or thinned areas.
  • the avoidance areas and/or the thinning areas are distributed on the bending area at intervals along a third direction, and the third direction is perpendicular to the first direction and the second direction.
  • the first bending area and the second bending area are still connected without disconnection, which is beneficial to improve the structural strength of the bending area, protect the tabs, and reduce the gap between the first bending area and the second bending area at the fracture surface.
  • the risk of burrs and the like at the edge of the bending line piercing the packaging tape which is used to package and protect the head structure of the cell, so that, for example, the head structure is electrically insulated from the outside world.
  • the bending area includes a first bending area and a second bending area oppositely disposed along the second direction; along the third direction, on at least one side of the tab, the length of the first bending area is less than For the length of the second bending zone, the third direction is perpendicular to the first direction and the second direction. The risk of burrs and the like at the fracture site (that is, the edge of the bending line) of the first bending area piercing the sealing tape is reduced.
  • the length difference between the second bending region and the first bending region is D 0 , and 0.5mm ⁇ D 0 ⁇ 3.0mm.
  • the bending angle of the bending region is ⁇ 0 , and 60° ⁇ 0 ⁇ 120°.
  • the radius of curvature of the first bending zone is R 1
  • the radius of curvature of the second bending zone is R 2
  • an adhesive is provided between the top sealing part and the circuit board, and the adhesive is used to insulate and fix the circuit board on the top sealing part, which can reduce the aluminum-plastic film between the circuit board and the top sealing part (such as The exposed aluminum-plastic film at the fracture) may reduce the risk of electrical contact, and can reduce the length of the battery in the length direction.
  • the adhesive member includes: at least one of double-sided adhesive tape, foam, hot melt adhesive, and silica gel.
  • the embodiment of the present application provides a battery cell, including: a packaging bag, an electrode assembly, tabs, and tab glue.
  • the packaging bag includes a main body and a top seal.
  • the main body includes a bottom wall, a side wall and a top wall. The side walls are respectively connected to the bottom wall and the top wall.
  • the top seal is connected to the top wall and bent toward the top wall; the electrode assembly accommodates In the main part; one end of the tab is electrically connected to the electrode assembly, and the other end of the tab extends out of the top seal; the tab glue is located between the tab and the top seal; the packaging bag also includes a side seal, which is connected to the The side wall is bent towards the side wall, the top seal part is connected to the side seal part, the end of the side seal part away from the top wall has a first side, the end of the top seal part away from the top wall has a second side, the first side and the first side
  • the angle between the two sides is ⁇ , and 5° ⁇ 60°
  • the angle between the second side and the top wall is ⁇ ', and 60° ⁇ ' ⁇ 120°.
  • the opening length of the angle between the first side and the second side is L 0 , and 1.0mm ⁇ L 0 ⁇ 8.0mm; alternatively, 1.0mm ⁇ L 0 ⁇ 3.5mm, minus While the length of the small battery cell is in the second direction, the risk of damage of the top sealing part and the side sealing part at the bending place is reduced.
  • the height of the first side protruding from the top wall is H 1 , and 1.0mm ⁇ H 1 ⁇ 4.0mm; alternatively, 1.0mm ⁇ H 1 ⁇ 3.7mm, or, 1.5mm ⁇ H 1 ⁇ 2.5mm, while reducing the risk of damage to the top seal and side seal at the bend, the length of the battery cell is reduced.
  • the thickness of the aluminum-plastic film of the top seal and the side seal is between 67 ⁇ m and 150 ⁇ m, preferably between 86 ⁇ m and 115 ⁇ m, which facilitates the bending of the top seal and the side seal.
  • the battery cell further includes a thermistor, the thermistor is disposed within the angle between the first side and the second side, and the thermistor is used to prevent the battery cell from working when the temperature is too high.
  • the angle between the first side and the second side is filled with a filler, and the filler is used to fix the angle between the first side and the second side.
  • the filler is glue.
  • an embodiment of the present application provides a battery, including a circuit board and any battery cell described above, and the circuit board is electrically connected to tabs of the battery cell.
  • the packaging bag includes two opposite side seals, the circuit board is disposed between the two side seals and on the top wall, and the two ends of the circuit board are disposed opposite to the corresponding side seals. It can reduce the extrusion of the two ends of the circuit board to the side sealing part, and reduce the risk of damage to the side sealing part due to collision.
  • the distance between any end of the circuit board and the corresponding side sealing portion is W 1 , and 2.0mm ⁇ W 1 ⁇ 8.0mm.
  • an adhesive is provided between the top sealing part and the circuit board, and the adhesive is used to insulate and fix the circuit board on the top sealing part, which can reduce the aluminum-plastic film between the circuit board and the top sealing part (such as The exposed aluminum-plastic film at the fracture) may reduce the risk of electrical contact, and can reduce the length of the battery in the length direction.
  • the adhesive member includes: at least one of double-sided adhesive tape, foam, hot melt adhesive, and silica gel.
  • the embodiments of the present application provide a method for manufacturing a battery cell, which is used to manufacture any one of the above-mentioned battery cells.
  • the method includes: placing the battery cell in a positioning jig for positioning, wherein the battery cell includes a main body part, top seal part and side seal part, the main part includes bottom wall, side wall and top wall, the side walls are respectively connected with the bottom wall and top wall, the top seal part is connected with the top wall, the side seal part is connected with the side wall, and the top
  • the side seal is connected to the side seal, the end of the side seal away from the top wall has a first side, and the end of the top seal away from the top wall has a second side; bend the side seal toward the side wall; turn the top seal toward the top
  • the wall is bent, and the angle between the first side and the second side is ⁇ , and 5° ⁇ 60°, and the angle between the second side and the top wall is ⁇ ', and 60° ⁇ ' ⁇ 120°.
  • embodiments of the present application provide an electronic device, including a load, and the cell or battery of any one of the above embodiments, where the cell or battery is used to supply power to the load.
  • the exposed part of the ear glue is provided with a bending line, and the exposed part can be bent along the bending line, and after bending, the electric cell The length in the direction of the core length is reduced, which is beneficial to reducing the packaging space of the battery core and increasing the capacity of the battery core.
  • FIG. 1 is a schematic diagram of a three-dimensional structure of a cell provided in an embodiment of the present application
  • Fig. 2 is the front view of the electric core of the first embodiment of the present application
  • Fig. 3 is a schematic diagram of electrically connecting the battery cell and the circuit board shown in Fig. 2 and bending the ear glue;
  • Fig. 4 is an enlarged view of the structure of region I of the battery shown in Fig. 3;
  • Fig. 5 is a front view of a battery cell according to a second embodiment of the present application.
  • Fig. 6 is an enlarged view of the structure of the region II of the cell shown in Fig. 5;
  • Fig. 7 is a schematic structural view of the electric core of the present application when the ear glue is not cut by laser;
  • Fig. 8 is a schematic diagram of electrically connecting the battery cell and the circuit board shown in Fig. 5 and bending the ear glue;
  • FIG. 9 is an enlarged view of the structure of region III of the battery shown in FIG. 8;
  • Fig. 10 is a schematic structural view of the battery shown in Fig. 8 viewed along a first direction;
  • Fig. 11 is a schematic diagram of a scene of laser cutting ear glue according to an embodiment of the present application.
  • FIG. 12 is a schematic flow chart of a method for manufacturing a cell according to an embodiment of the present application.
  • Fig. 13 is an enlarged view of the structure of the area A of the cell shown in Fig. 1;
  • Fig. 14 is an enlarged view of the structure of the area B of the cell shown in Fig. 1;
  • FIG. 15 is a schematic flow chart of a method for manufacturing a cell according to another embodiment of the present application.
  • Fig. 16 is an enlarged view of the structure of region III of the battery shown in Fig. 8;
  • Fig. 17 is a schematic structural diagram of a battery cell according to a third embodiment of the present application.
  • Fig. 18 is an enlarged view of the structure of the region IV of the cell shown in Fig. 17;
  • FIG. 19 is a schematic structural view of a battery cell according to a fourth embodiment of the present application.
  • Fig. 20 is an enlarged view of the structure of the region V of the cell shown in Fig. 19;
  • Fig. 21 is a schematic structural view of the cell according to the fifth embodiment of the present application when viewed in the opposite direction from the first direction;
  • Fig. 22 is an enlarged view of the structure of the region VI of the cell shown in Fig. 21;
  • Fig. 23 is a schematic structural view of the battery cell according to the sixth embodiment of the present application when viewed along the first direction;
  • Fig. 24 is an enlarged view of the structure of the region VII of the cell shown in Fig. 23;
  • Fig. 25 is a schematic diagram of the electric core shown in Fig. 22 being electrically connected to the circuit board and the tab glue being bent;
  • FIG. 26 is an enlarged view of the structure of the region VIII of the battery shown in FIG. 25.
  • the exposed part of the tab glue is provided with a bending area, and the tab is bent in the bending area, That is, the exposed part of the tab can be bent along with the bending of the tab.
  • the exposed part of the tab can not only protect the bending area of the tab and the part of the tab extending toward the circuit board, but also The length of the electric core can be reduced, which is beneficial to reducing the packaging space required by the electric core and improving the capacity of the electric core.
  • the battery cell 10 of this embodiment includes a packaging bag 11 , an electrode assembly (not shown), tabs 13 , and tab glue 14 .
  • the packaging bag 11 surrounds the shape of the electric core 10, and can also be used to define the appearance of the electric core 10.
  • the packaging bag 11 includes a top sealing part 11a, a main body part 11b and a side sealing part 11c, and the electrode assembly is arranged on the main body part 11b Inside, the top seal portion 11a and the tab 13 extend from the first end surface of the main body portion 11b.
  • the first end surface of the main body 11b can be regarded as the first end surface 10a of the battery cell 10 , which will be described below as an example.
  • the main body part 11b is formed with a housing cavity, and the internal components of the battery cell 10 (such as electrode assembly and electrolyte) are contained in the housing cavity, and the internal components are protected by the packaging bag 11 to improve the protection effect and safety.
  • the main body portion 11b includes a bottom wall 11b1, a side wall 11b2, and a top wall 11b3.
  • the bottom wall 11b1 and the top wall 11b3 are disposed opposite to each other.
  • the side walls 11b2 are respectively connected to the bottom wall 11b1 and the top wall 11b3.
  • the top seal portion 11a and the side seal portion 11c are formed by sealing the packaging bag 11 after the electrode assembly is accommodated in the main body portion 11b.
  • the top seal part 11a is connected to the top wall 11b3, and the side seal part 11c is connected to the side wall 11b2.
  • the top seal portion 11a is used to realize the sealing of the packaging bag 11, and is used to prevent the electrolyte from leaking from the first end surface 10a, and impurities such as water and oxygen from the outside of the packaging bag 11.
  • the first end surface 10 a enters into the packaging bag 11 .
  • the top sealing portion 11a also seals the protruding area of the tab 13, so as to realize the sealing of the junction of the packaging bag 11 and the tab 13.
  • the side sealing part 11c is bent toward the side wall 11b2, and the top sealing part 11a is bent toward the top wall 11b3.
  • the side sealing portion 11c and the top sealing portion 11a are relatively weak parts in the battery cell 10
  • the side seal portion 11c and the top seal portion 11a are relatively weak parts in the battery cell 10
  • the side seal portion 11c and the top seal portion 11a are relatively weak parts in the battery cell 10
  • the side seal portion 11c and the top seal portion 11a is not easy to be damaged due to collision and other reasons, so that the service life of the battery cell 10 provided by the embodiment of the present application is long.
  • the top sealing part 11a is a structure protruding from the main body part 11b of the battery cell 10. As shown in FIG. 10a, reducing the overall length of the battery cell 10 , the second direction y is the length direction of the battery cell 10 . It should be understood that in the battery cell 10, please refer to FIG. 2 together, the top sealing portion 11a may not be bent, but extend along the second direction y, at this time, the tab is not bent, and the tab 13 extends The direction is the second direction y.
  • the thickness direction of the battery core 10 may be the first direction x
  • the width direction of the tab 13 may be the third direction z
  • the first direction x, the second direction y and the third direction z are It should be noted that due to the limitation of actual processing or measurement errors, the so-called vertical in the whole application does not require that the angle between the two must be 90°, but allows the existence of ⁇ 10°
  • the deviation, the so-called vertical can be understood as the angle between any two directions is 80° to 100°.
  • the top seal portion 11a is bent toward the first end face 10a and fixed to the first end face 10a, including any of the following three scenarios:
  • the top seal portion 11a is in contact with at least a part of the first end face 10a, for example A part of a side surface of the top sealing portion 11a close to the first end surface 10a is in contact with the first end surface 10a, or, a side surface of the top sealing portion 11a close to the first end surface 10a is entirely in contact with the first end surface 10a.
  • the top sealing part 11a is arranged opposite to the first end surface 10a, and there is no contact between the two and there is a predetermined distance.
  • the predetermined distance can be determined according to the actual scene requirements, for example, it can be greater than 0 and less than or equal to 1 mm.
  • an adhesive member is provided between the top seal portion 11a and the first end surface 10a of the top wall 11b3, such as double-sided adhesive tape, foam, hot melt adhesive, silica gel, viscous heat dissipation material, etc., preferably thermal Melt glue, the adhesive can fully or partially cover the first end surface 10a, and/or, the adhesive can be arranged in a straight line or wave shape (the embodiment of the application does not limit the shape of the adhesive) on the first end surface 10a, the top sealing portion 11a is bonded to the first end surface 10a of the top wall 11b3.
  • the electrode assembly includes a positive pole piece and a negative pole piece, and a separator disposed between the positive pole piece and the negative pole piece.
  • the electrode assembly can be formed by winding or laminating several pole pieces.
  • One end of the tab 13 is electrically connected to the electrode assembly, for example, it extends into the packaging bag 11 and is electrically connected to the pole piece of the corresponding polarity. The other end of the tab 13 extends Out of the top sealing part 11a.
  • the tab 13 includes a first tab 13a and a second tab 13b, the first tab 13a is a negative tab, and correspondingly, the second tab 13b is a positive tab.
  • the first tab 13a is electrically connected to the negative pole piece
  • the second pole tab 13b is electrically connected to the positive pole piece, and extends out of the packaging bag 11 respectively.
  • the first tab 13a may be a positive tab
  • the second tab 13b may be a negative tab.
  • the structures of the first tab 13a and the second tab 13b may be the same or different, and they may be arranged symmetrically or asymmetrically along the third direction z. In some parts of this document, one of them is taken as an example to describe the structure of the tab 13 in the embodiment of the present application.
  • the structure and shape of the tab 13 are not limited by the embodiments of the present application.
  • the tabs 13 may be in the shape of rectangular strips, and the respective sizes may be adaptively set according to actual needs, and the materials include but are not limited to alloys such as aluminum, nickel, copper, and nickel-plated copper.
  • the material of the positive pole tab 13 can be aluminum or nickel-plated aluminum
  • the material of the negative pole tab 13 can be copper-plated nickel, which not only helps to improve the electrical connection performance with the negative pole piece, but also improves the structural strength of the negative pole tab. .
  • the tab glue 14 is located between the tab 13 and the top seal portion 11a, and the tab glue 14 is bonded to the tab 13, and is also bonded to the packaging bag 11 (such as the aluminum-plastic film of the soft package packaging bag) to improve the packaging bag. 11 Sealing effect at the lug 13.
  • the tab glue 14 can be respectively disposed on the first surface and the second surface of the tab 13 , and the first surface and the second surface are oppositely arranged along the thickness direction of the tab 13 .
  • FIG. 1 and FIG. 2 are structural schematic diagrams of the ear glue 14 in an unbent state
  • FIG. 3 and FIG. 4 are structural schematic diagrams of the tab glue 14 in a bent state.
  • the tab glue 14 in an unbent state As shown in FIGS.
  • the first part 1411 and the second part 1412 are set in the extension direction (ie, the second direction y), and the bending line O is set between the first part 1411 and the second part 1412, that is, the bending line O divides the exposed part 141 into connected second parts.
  • the bending line O In the part 1411 and the second part 1412 , the bending line O is perpendicular to the extending direction y of the tab 13 on the tab glue 14 .
  • the tab glue 14 can be bent along the bending line O.
  • the exposed part 141 of the tab glue 14 is bent along the bending line O.
  • the circuit board 21 can be arranged adjacent to the top seal portion 11a, and correspondingly, the bent tab 13 extends to the side of the circuit board 21 facing away from the top seal portion 11a (that is, FIG. 3 4 ), the circuit board 21 can be electrically connected to the tab 13 through the conductive member 22.
  • the first part 1411 and the second part 1412 are connected and arranged along the second direction y.
  • the bending line O can reduce the difficulty of bending the tab glue 14, so that the length of the tab glue 14 in the second direction y can be reduced after being bent, which is beneficial to reducing the packaging space required by the battery core 10, and is conducive to improving the battery capacity.
  • the bending line O may be a design that does not damage the structure of the tab glue 14 , for example, it is only a line marked or not marked on the tab glue 14 .
  • the bending line O is a line that is not marked on the ear glue 14
  • the exposed portion 141 of the tab glue 14 is bent along with the bending of the tab 13 , and the exposed portion 141 is also disposed on a part of the tab 13 extending toward the circuit board 21 after bending.
  • the tab 13 is bent toward the circuit board 21 , the exposed portion 141 of the tab glue 14 is at least disposed on the tab bending portion 133 where the tab 13 is bent toward the circuit board 21 , and the exposed portion 141 is disposed at least on the
  • the tab bending area 133 and the second tab portion 132 of the tab 13 the bent tab 13 includes a first tab portion (not shown), a second tab portion 132 and a tab bending area 133, the tab bending area 133 is connected to the first tab portion and the second tab portion 132, the first tab portion is electrically connected to the electrode assembly and extends toward the tab bending area 133, and the second tab portion 132 faces
  • the circuit board 21 extends and is electrically connected to the circuit board 21.
  • the extension directions of the first tab part and the second tab part 132 are different.
  • the first tab part extends along the third direction z
  • the second tab part 132 extends along the direction opposite to the third direction z
  • the tab bending area 133 is an arc-shaped structure.
  • the extension directions of the first lug portion and the second lug portion 132 may not be opposite, but have an angle that meets the design requirements, as long as the tab bending area 133 is an arc-shaped structure That's it.
  • the tab bending region 133 may not have two upper and lower arc-shaped corners as shown in FIG. 4 , but may also be an arc-shaped structure of other shapes, for example, only have one arc-shaped corner.
  • the bent tab glue 14 is not only arranged in the bending area of the tab 13 (that is, the tab bending area 133 ), but also in a part of the tab 13 extending toward the circuit board 21 (i.e. the second tab part 132), the exposed part 141 of the tab glue 14 can not only protect the tab bending area 133 of the tab 13 and the second tab part 132, but also make the tab glue 14 bend
  • the length in the second direction y is reduced, which is beneficial to reducing the packaging space required by the battery cell 10 and improving the capacity of the battery cell 10 .
  • the tab glue 14 can also be disposed on a part of the tab 13 connected to the electrode assembly (ie, the first tab portion).
  • the circuit board 21 may not exceed the thickness range of the main body portion 11 b, which is beneficial to reduce the overall thickness of the battery cell 10 .
  • one end of the circuit board 21 (for example, the end of the circuit board 21 facing away from the exposed portion 141) can exceed the main body 11b, and when the battery cell 10 is matched with the electric device (such as a battery compartment), the circuit board 21 exceeds One end of the main body part 11b can be combined with the space of the electrical equipment, so as to realize the stability of assembly.
  • an adhesive may be provided between the top sealing portion 11a and the circuit board 21, and the adhesive is used to insulate and fix the circuit board 21 on the top sealing portion 11a, for example, on On the side of the top seal portion 11a facing away from the battery core 10, the risk of electrical contact between the circuit board 21 and the aluminum-plastic film of the top seal portion 11a (such as the aluminum-plastic film exposed at the fracture) can be reduced, and the battery 10 can be reduced in the second Length in direction y.
  • the adhesive member includes: at least one of double-sided adhesive tape, foam, hot-melt adhesive, and silica gel, or other viscous insulating and heat-dissipating materials.
  • the adhesive member can cover the top seal portion 11a (and/or the overlapping area of the top seal portion 11a and the circuit board 21) in whole or in part, and/or, the adhesive member can be arranged in a straight line or a wave shape.
  • the implementation of the present application The example does not limit the shape of the adhesive member.
  • the bending line O of this embodiment is implemented as a space avoidance area 141d, that is, the bending line O is designed to destroy the structure of the tab glue 14 .
  • the first part 1411 and the second part 1412 are oppositely arranged, and the space-avoiding area 141d is arranged between the first part 1411 and the second part 1412, and the space-avoiding area 141d is formed on the tab glue 14 perpendicular to the extending direction of the tab 13
  • the bending line O of y, at the bending line O, the thickness of the tab glue 14 is zero.
  • the exposed portion 141 of the tab glue 14 includes a first subsection 141a, a bending area 141b and a second subsection 141c.
  • the first subsection 141a It is connected to the top sealing part 11a and extends along the first direction x
  • the second sub-part 141c is arranged opposite to the first sub-part 141a along the second direction y
  • the second sub-part 141c is connected to the circuit board 21 and extends along the first direction x.
  • the bending area 141b is connected between the first sub-section 141a and the second sub-section 141c, and the bending area 141b is provided with a void area 141d.
  • the two parts 1412 are formed into a bending area 141b and a second sub-section 141c , the second sub-section 141c is disposed on the second tab part 132 , and the bending area 141b is disposed on the tab bending area 133 .
  • the space-avoiding area 141d can reduce the difficulty of bending the tab glue 14. After the tab 13 and the tab glue 14 are bent, the length in the length direction of the battery cell 10 (that is, the second direction y) is reduced, which is beneficial to reduce the length of the battery cell. 10 required packaging space, and is conducive to increasing the capacity of the battery cell 10.
  • the thickness that is, the length of the first direction x).
  • the width of the top sealing portion 11 a (ie the length of the top sealing portion 11 a along the extending direction of the tab 13 ) is H 2 , and 1.0 mm ⁇ H 2 ⁇ 4.0 mm.
  • H 2 By reducing H 2 , not only is it beneficial to reduce the thickness of the battery core 10 , but also it is beneficial to set a longer exposed portion 141 in the thickness direction of the battery core 10 , thereby facilitating the bending of the tab 13 and the tab glue 14 .
  • the length of the bending area 141b in the second direction y can be understood as: viewed along the first direction x, the length of the orthographic projection of the bending area 141b in the second direction y. Along the second direction y, the length of the tab glue 14 in the unbent state is greater than the length in the bent state. Correspondingly, as shown in FIGS.
  • the first sub-section 141a and the second sub-section 141c both extend along the second direction y and are oppositely arranged before bending, and after bending, the first sub-section 141a extends along the first direction x, and the second sub-section 141c extends along the direction opposite to the first direction x; the length of the space-avoiding area 141d in the second direction y is larger in the unbent state than in the bent state.
  • the bending area 141b includes a first bending area 141e and a second bending area 141f which are oppositely arranged along the second direction y, and the space-avoiding area 141d is arranged in the first bending area 141e and the second bending area 141f.
  • the space-avoiding area 141d when the battery cell 10 is in the unbent state, the space-avoiding area 141d is continuously distributed on the exposed portion 141 perpendicular to the extending direction of the tab 13; when the battery cell 10 is in the bent state, the space-avoiding area 141d Continuously distributed along the third direction z on the bending area 141b, it can be considered that the avoidance area 141d runs through the bending area 141b along the third direction z.
  • the bending angle of the exposed portion 141 at the bend of the tab 13 is ⁇ 0 , and 60° ⁇ 0 ⁇ 120°, It is beneficial to the bending of the tab 13 and the tab glue 14 .
  • the bending angle ⁇ 0 can be understood as: the included angle after the bending area 141b is bent, so that the bending area 141b includes the arc-shaped first bending area 141e and the second bending area 141e which are oppositely arranged along the second direction y Taking the zone 141f as an example, the included angle between the tangent of the first bending zone 141e and the tangent of the second bending zone 141f.
  • the first bending area 141e and the second bending area 141f are both arc-shaped structures
  • the curvature radius of the first bending area 141e is R 1
  • the curvature of the second bending area 141f The radius is R 2
  • the radius of curvature R 1 can be understood as the distance from one end of the first bending zone 141e, the other end of the first bending zone 141e, and the middle point between one end and the other end on the first bending zone 141e
  • the radius of curvature R2 can be understood as the distance between one end of the second bending area 141f, the other end of the second bending area 141f, and the middle point between the one end and the other end of the second bending area 141f.
  • the distances are equal in length.
  • 0.1mm ⁇ R 1 ⁇ 0.5mm, 0.1mm ⁇ R 2 ⁇ 0.5mm by reducing the radius of curvature of the first bending zone 141e and the second bending zone 141f, the first bending zone is reduced
  • the curvature of the bending area 141e and the second bending area 141f reduces the length of the bending area 141b in the second direction y after bending, which is beneficial to reducing the packaging space required by the battery cell 10 and increasing the capacity of the battery cell 10 .
  • the height of the exposed part 141 is H 0 , and 0.2mm ⁇ H 0 ⁇ 3.0mm, by reducing H 0 , it is beneficial to reduce the tab
  • the height of the glue 14 after bending can reduce the height of the battery cell 10 (along the second direction y), thereby reducing the packaging space required by the battery cell 10 (eg, the height of the battery compartment for accommodating the battery cell 10 ).
  • the avoidance area 141d can be made by laser cutting process.
  • the manufacturing method of the battery cell includes the following steps S11 and S12.
  • S11 Place the cell encapsulated by the tab glue on the positioning device for positioning, wherein the tab glue is located between the tab of the cell and the top seal.
  • the battery core 10 with the tab 13 and the tab glue 14 is placed in a predetermined area and positioned by the positioning device 71.
  • the laser generating device 72 can generate carbon dioxide laser; the pulse width of the laser is 10 ns to 500 ns, and the frequency is 500 KHz to 2000 KHz.
  • the laser moving speed is 20mm/s to 50mm/s.
  • the laser generating device 72 cuts one side of the tab glue 14 (that is, the tab glue 14 on one side of the tab 13) along the third direction z, and then turns the battery 10 over and cuts the other side of the tab glue 14.
  • side that is, the tab glue 14 on the other side of the tab 13
  • the ear glue 14 is cut with a continuous laser having the first energy to form continuously distributed void areas 141d on the tab adhesive 14, and the continuously distributed void areas 141d are conducive to reducing the manufacturing cost. difficulty.
  • the length of the space-avoiding area 141d before bending may be greater than the length after bending.
  • the length of the space-avoiding area 141d after bending is D 1 , And 0 ⁇ D 1 ⁇ 0.4mm.
  • the edge of the space-avoiding area 141d (that is, the first The burrs in the bending area 141e and the second bending area 141f on the cut edge) will puncture the risk of the packaging tape, which is used to package and protect the head structure of the electric core 10, so that the head structure ( For example, the top sealing part 11a, the circuit board 21) are isolated from the outside world (including electrical insulation) and the like.
  • the length of the first bending region 141e after bending is D 2 , and 0.2mm ⁇ D2 ⁇ 1.0mm ,
  • D 2 the risk of burrs and the like at the fracture (that is, the edge to be cut) of the first bending region 141e piercing the sealing tape can be reduced.
  • the length of the first bending region 141e after bending can be understood as: viewed along the first direction x, the length of the orthographic projection of the first bending region 141e on the second direction y.
  • the length of the bending region 141b in the first direction x is D 3 , and 0.1mm ⁇ D 3 3 ⁇ 0.5mm. By reducing D 3 , the bending region 141b is reduced.
  • the length in the thickness direction of the battery cell 10 ie, the first direction x
  • the length of the bending area 141b in the first direction x can be understood as: viewed along the second direction y, the orthographic projection of the bending area 141b (including the first bending area 141e and the second bending area 141f) in the first direction length on x.
  • the top seal portion 11a is bent towards the top wall 11b3 , and the intersection of the top seal portion 11a and the side seal portion 11c forms a corner 11d.
  • the preparation process of the knuckle 11d is not limited in the embodiment of the present application, for example, it includes the following steps S21 to S23.
  • the battery cell includes a main body, a top seal and a side seal
  • the main body includes a bottom wall, side walls and a top wall
  • the side walls are respectively connected to the bottom wall and the top wall
  • the top seal is connected to the top wall
  • the side seal is connected to the side wall
  • the top seal is connected to the side seal
  • the end of the side seal away from the top wall has a first side
  • the end of the top seal away from the top wall has a second side side.
  • the battery cell 10 can be placed in the positioning jig for positioning first, and then the side sealing part is bent by the first part of the positioning jig, and the first part pushes the side sealing part and makes it bend toward the side wall 11b2 , and then bend the top seal portion 11a through the second part of the positioning fixture, the second part pushes the top seal portion 11a to bend toward the top wall 11b3 to obtain the bent corner 11d, the first part can be along the second direction
  • the strip extending along y, the second part is a strip extending along the third direction z, and the first part and the second part can also be used to position the electric core 10 .
  • the positioning block is used to push the top sealing portion 11a in the direction opposite to the second direction y, so as to shape the bent corner 11d, and finally obtain the corner 11d.
  • the end of the side seal part 11c away from the top wall 11b3 has a first side 11c1
  • the end of the top seal part 11a away from the top wall 11b3 has a second side 11a1
  • the first side 11c1 and the second side 11a1 can be regarded as two sides of the folded corner 11d .
  • the angle between the first side 11c1 and the second side 11a1 is ⁇ , and 5° ⁇ 60°
  • the angle between the second side 11a1 and the top wall 11b3 is ⁇ ', and 60° ⁇ ' ⁇ 120°.
  • the knuckle 11d is almost perpendicular to the top wall 11b3, and is in contact with the external electrical equipment (such as the battery compartment)
  • the length in the width direction (for example, the third direction z) can be reduced during mating.
  • the opening length of the angle between the first side 11c1 and the second side 11a1 is L 0 , and 1.0mm ⁇ L 0 ⁇ 8.0mm; alternatively, 1.0mm ⁇ L 0 ⁇ 3.5mm.
  • the opening length of the corner 11d is L0 , which can be understood as: the distance between the intersection point of the first side 11c1 and the top wall 11b3 and the intersection point of the second side 11a1 and the top wall 11b3.
  • the height of the first side 11c1 protruding from the top wall 11b3 is H 1 , and 1.0mm ⁇ H 1 ⁇ 4.0mm; alternatively, 1.0mm ⁇ H 1 ⁇ 3.7mm, or, 1.5mm ⁇ H 1 ⁇ 2.5mm, while reducing the risk of damage to the top seal portion 11a and the side seal portion 11c at the bends, the length of the battery cell 10 in the second direction y should be reduced as much as possible.
  • the thickness of the aluminum-plastic film of the top seal part 11a and the side seal part 11c can be preferably between 86 ⁇ m and 115 ⁇ m, which is conducive to the bending of the 11a and the side seal part 11c to form the corner 11d And to avoid damage during the process of forming the folded corner 11d, of course, it can also be between 67 ⁇ m and 86 ⁇ m or between 86 ⁇ m and 115 ⁇ m.
  • the electric core 10 can also include a thermistor (not shown), the thermistor is connected to the circuit board 21 through a wire, and the wire can be arranged on the first end surface 10a, and the thermistor prevents the electric core 10 from being heated when the temperature is too high. down to work.
  • the thermistor can be arranged in the corner 11d to make full use of the space of the corner 11d.
  • the folded corner 11d may be filled with a filler, and the filler is used to fix the shape of the folded corner 11d to reduce deformation or even damage of the folded corner 11d.
  • the filler can be glue, etc., and the glue can be filled in the corner 11d and cured.
  • the filler can also wrap the thermistor (or also wrap the wire connected to it) to protect the thermistor.
  • the packaging bag 11 may include two side seals 11c oppositely arranged along the third direction z. Correspondingly, the packaging bag 11 is formed with two folded corners 11d.
  • the circuit board 21 may be arranged on Between the two corners 11d (or the side seals 11c ) and on the top wall 11b3 , the two ends of the circuit board 21 are opposite to the corresponding side seals 11c. The two ends of the circuit board 21 are not in contact with the two corners 11d respectively, which can reduce the extrusion of the two ends of the circuit board 21 to the side sealing part 11c, and reduce the risk of damage to the side sealing part 11c due to collision.
  • the distance between any end of the circuit board 21 and the corresponding side sealing portion 11c is W 1 , and 2.0mm ⁇ W 1 ⁇ 8.0mm , by controlling W 1 , the extrusion of the circuit board 21 on the side seal portion 11c can be reduced, and the length of the battery 20 along the third direction z (ie, the width of the battery 20 ) can also be reduced.
  • the exposed portion 141 is provided with a thinned area 141g, and the thinned area 141g forms a bending line O on the tab glue 14 .
  • the thinned area 141g does not break the tab glue 14, but only thins the thickness of the tab glue 14 in the thinned area 141g, and the thickness of the thinned area 141g is smaller than that of the rest The thickness of the location.
  • the position, shape, size, etc. of the thinned area 141g can be the same as those of the space-avoiding area 141d.
  • the structural form of the exposed portion 141 after being bent along the bending line O formed by the thinned area 141g and the resulting beneficial effects you can refer to the foregoing, and will not repeat them here.
  • the tab glue 14 is cut with the laser of the second energy to form the thinned region 141g on the tab glue 14, the second energy is smaller than the first energy, and the first The energy is the energy of the laser cutting to form the avoidance area 141d.
  • FIG. 17 and FIG. 18 it is a schematic structural view of the tab glue 14 in an unbent state.
  • the space-avoiding areas 141d are distributed at intervals on the exposed portion 141 perpendicular to the direction in which the tabs 13 extend; when the battery cell 10 is in a bent state, The avoidance areas 141d are distributed at intervals along the third direction z on the bending area 141b.
  • the first bending area 141e and the second bending area 141f are still connected, but not completely disconnected, which is conducive to improving the structural strength of the bending area 141b, improving the protection effect of the tab 13, and reducing the first bend. There is a risk that the burrs in the folded area 141e and the second bent area 141f at the fracture (ie, the edge of the empty area 141d ) will puncture the sealing tape.
  • the tab glue 14 is cut with a first-energy intermittent laser, so as to form a continuously distributed space avoidance area 141d on the tab glue 14
  • a first energy and continuous laser is used to form a space avoidance area 141d
  • the energy of the laser is interrupted (that is, no laser light is generated)
  • a second energy and continuous laser light is used to form a space at the next space avoidance area 141.
  • the avoidance area 141d until forming a plurality of avoidance areas 141 distributed at intervals.
  • each avoidance area 141d may be a rectangle as shown in FIG. 17 and FIG. 18 , or may be other types of polygons such as a circle and a triangle, which are not limited in this embodiment of the present application.
  • the number of space-avoiding areas 141d provided by the tab glue 14 at each tab 13 is not limited in this embodiment, and the four space-avoiding areas 141d shown in FIG. 17 and FIG. 18 are only exemplary.
  • FIG. 19 and FIG. 20 are structural schematic diagrams of the tab glue 14 in an unbent state.
  • the length of the first bending area 141e remains unchanged before and after bending
  • the length of the second bending area 141f also remains unchanged before and after bending.
  • this embodiment marks the difference in length between the first bending region 141e and the second bending region 141f in the unbent state in FIG. 19 and FIG. 20 .
  • the length of the first part 1411 is smaller than the length of the second part 1412, when the battery core 10 is in a bent state, along the third direction z, on the first side and the second side of the tab 13 (that is, as shown in Figure 20
  • the length of the second bending area 141f is smaller than the length of the first bending area 141e, reducing the risk of burrs at the fracture of the second bending area 141f piercing the sealing tape.
  • the length difference between the second bending region 141f and the first bending region 141e is D 0 , and 0.5mm ⁇ D 0 ⁇ 3.0 mm. It should be understood that, on the left or right side of the tab 13, the length difference between the second bending area 141f and the first bending area 141e may be equal or not equal; or, the second bending area 141f and The first bending region 141e only has a difference in length on one side, while the length on the other side is equal (that is, flush).
  • the length of the first bending region 141e may be set to be shorter than the length of the second bending region 141f only on at least one side of the tab 13.
  • the first side is located on the left side of the tab 13
  • the second side is located on the right side of the tab 13 .
  • the space-avoiding area 141d is set on the second side of the bending area 141b, that is, the space-avoiding area 141d is set on the right side of the tab 13 in the bending area 141b, and the space-avoiding area 141d can reduce the tab glue.
  • the tab glue 14 is difficult to bend, and the tab glue 14 is not provided with a space-avoiding area 141d inside the tab 13, the inner tab glue 14 can reduce the aluminum-plastic film between the tab 13 and the circuit board 21 and the cutout of the top seal 11a The risk of electrical contact, thereby reducing the safety risk caused by the short circuit of the battery cell 10 as a whole.
  • the length of the tab glue 14 on the side of the tab 13 facing the top seal 11a is D 4 , and 0.5mm ⁇ D 4 ⁇ 2.5mm, by increasing the tab 13 towards the top
  • the length of the tab glue 14 on the side of the sealing part 11a in the second direction y can reduce the risk of electrical contact between the tab 13 and the circuit board 21 and the aluminum-plastic film of the cutout of the top sealing part 11a.
  • the circuit board 21 can be arranged adjacent to the top sealing part 11a.
  • the tab glue 14 may only include the first sub-part 141a and the bending area 141b, and the bending area 141b may be It consists of two parts, one part connected to the first sub-part 141a can be equivalent to the first bending area 141e described in the previous embodiment, and the other part can extend along the second direction y without bending, which can reduce the tab glue
  • the bent part of 14 reduces the risk of the ear glue 14 being broken due to bending.
  • the above-mentioned embodiments can also adopt the setting of this embodiment, that is, the bending area 141b is provided with the space-avoiding area 141d corresponding to each embodiment on the outside of the tab 13, and the space-avoiding area 141d is not provided on the inside. The safety risk caused by the short circuit of the battery cell 10 is reduced.
  • the embodiment of the present application also provides a battery.
  • the circuit board 21 is electrically connected to the tab 13 of the cell 10 , for example, the circuit board 21 is electrically connected to the tab 13 through a conductive member 22 .
  • the circuit board 21 is fixed on the upper surface of the top sealing part 11a, and the length of the head structure of the battery 20 in the second direction y is reduced, so that there is It is beneficial to reduce the head space of the battery 20 .
  • the type of the battery 20 applicable to the circuit board 21 is not limited in the embodiment of the present application, and the shape, size and function of the circuit board 21 can be determined according to the application scenario.
  • the circuit board 21 can be a rigid circuit board, such as a printed circuit board (Printed Circuit Board, PCB), or a flexible circuit board (Flexible Printed Circuit, FPC), and the circuit board 21 can be integrated with a BMS (Battery management system, battery management system), used to control the charging and discharging of the battery cell 10 to ensure safety.
  • BMS Battery management system, battery management system
  • the battery 20 includes, but is not limited to, all kinds of primary batteries, secondary batteries, fuel cells, solar cells, and capacitor (such as supercapacitor) batteries, and may be a pouch battery.
  • the battery 20 may preferably be a lithium secondary battery.
  • the battery 20 in the embodiment of the present application may exist in the form of a single battery, a battery unit or a battery module.
  • Embodiments of the present application also provide an electronic device, including a load and the battery 20 or battery cell 10 of any of the above embodiments, and the battery 20 or battery cell 10 supplies power to the load.
  • Electronic equipment can be implemented in various specific forms, for example, electronic products such as drones, electric vehicles, electric cleaning tools, energy storage products, electric vehicles, electric bicycles, and electric navigation tools.
  • electronic devices specifically include but are not limited to: backup power supplies, motors, automobiles, motorcycles, power-assisted bicycles, bicycle power tools, large household batteries and lithium-ion capacitors, etc.
  • the battery 20 and the electronic device have the battery cell 10 of any of the aforementioned embodiments, the battery 20 and the electronic device can produce the beneficial effects of the battery cell 10 of the corresponding embodiment.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Mounting, Suspending (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

本申请公开了一种电芯、电池、电芯的制造方法及电子设备。极耳胶包括延伸出顶封部的外露部，外露部设置有避空区和/或减薄区，避空区和/或减薄区用于供极耳弯折设置。极耳胶的外露部可以沿着避空区和/或减薄区弯折，极耳胶弯折后在电芯长度方向的长度得以降低，有利于降低电芯的封装空间以及提升电芯容量。

Description

电芯、电池、电芯的制造方法及电子设备
本申请要求于2021年9月2日提交中国专利局、申请号为202111028075.7、发明名称为“电芯、电池、电芯的制造方法及电子设备”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及电化学技术领域，具体涉及一种电芯、电池、电芯的制造方法及电子设备。
背景技术
随着电化学技术的蓬勃发展，人们对电池容量提升的要求越来越高。为了提升电池容量，当前厂商通常对电池的头部空间进行优化设计，这其中的折顶封电池即为当前较为流行的一种电池。在折顶封电池中，电池的顶封部弯折并固定至电池的一个端面，相应地，电池的极耳也被弯折以便于电连接于电路板，但是，极耳与顶封部之间设置有极耳胶，而为确保顶封部在极耳伸出位置的密封效果以及避免极耳与顶封部的裸露铝层接触，极耳胶一般会突出于顶封部一定长度，且受限于现有生产工艺水平，极耳胶突出顶封部的长度往往在1mm以上，由于极耳胶的硬度较高，不仅难以弯折，而且弯折后在电池长度方向上所占据的长度也较大，造成电池长度方向的空间浪费，不利于降低电芯的封装空间以及电池容量的提升。
发明内容
本申请的实施例提供一种电芯、电池、电芯的制造方法及电子设备，改善极耳胶的弯折难度，降低弯折后在电池长度方向上所占据的长度。
第一方面，本申请的实施例提供一种电芯，包括：包装袋、电极组件、极耳、以及极耳胶。包装袋包括主体部及顶封部，主体部包括底壁、侧壁和顶壁，侧壁分别与底壁和顶壁连接，顶封部连接于顶壁并朝向顶壁弯折；电极组件收容于主体部内；极耳的一端电连接于电极组件，极耳的另一端延伸出顶封部；极耳胶位于极耳和顶封部之间；极耳胶包括延伸出顶封部的外露部，该外露部设置有弯折线，弯折线在极耳胶上垂直于极耳延伸方向；可选地，沿极耳延伸 方向，弯折线与顶封部相对设置。弯折线可以降低极耳胶的弯折难度，外露部弯折后电芯长度方向上的长度得以降低，有利于提升电芯容量。
在一些实施例中，极耳胶在弯折线处弯折所需的应力小于其余位置弯折所需的应力，便于极耳胶的弯折。
在一些实施例中，外露部设置有避空区和/或减薄区，避空区和/或减薄区用于供极耳弯折设置，可选地，避空区和/或减薄区在极耳胶上形成弯折线。
在一些实施例中，外露部包括沿极耳延伸方向相对设置的第一部分和第二部分，弯折线设置于第一部分和第二部分之间。第二部分可以增大极耳被极耳胶覆盖的面积，减少极耳裸露部分，有利于保护极耳。
在一些实施例中，避空区和/或减薄区在外露部上垂直于极耳延伸方向连续分布。避空区和/或减薄区连续分布于第一弯折区和第二弯折区之间，可视为避空区和/或减薄区沿第三方向(例如第三方向垂直于极耳延伸方向)贯穿弯折区，有利于降低避空区和/或减薄区的制备难度。
在一些实施例中，避空区和/或减薄区在外露部上垂直于极耳延伸方向间隔分布。第一部分和第二部分之间仍然连接，而未断开，有利于提高外露部的结构强，保护极耳；另外，在弯折后，可以降低极耳与电路板及顶封部裁切口的铝塑膜电接触的风险，降低短路导致的安全风险。
在一些实施例中，外露部包括沿极耳延伸方向相对设置的第一部分和第二部分；沿垂直于极耳延伸方向，在极耳的至少一侧，第一部分的长度小于第二部分的长度。可以降低外露部在弯折后的断口处(即弯折线边缘)的毛刺等刺破封装胶纸的风险。可选地，沿垂直于极耳延伸方向，在极耳的至少一侧，第二部分与第一部分的长度之差为D 0，且0.5mm＜D 0≤3.0mm。
在一些实施例中，避空区和/或减薄区与顶封部的距离为W 0，且0.2mm＜W 0≤1.0mm；可选地，W 0＝0.5mm，便于极耳胶的弯折。
在一些实施例中，沿极耳延伸方向，外露部的长度为H 0，且0.2mm＜H 0≤3.0mm。
在一些实施例中，沿极耳延伸方向，顶封部的长度为H 2，且1.0mm＜H 2≤4.0mm。
在一些实施例中，弯折线设置于外露部的位于极耳的其中一侧。即，在极耳的一侧，极耳胶设置有弯折线，而在极耳的另一侧，极耳胶未设置弯折线，不仅可以降低极耳胶的弯折难度，而且，弯折线设置于弯折区背向顶封部的一 侧时，在弯折后，朝向顶封部的极耳胶可以降低极耳与电路板及顶封部裁切口的铝塑膜电接触的风险，降低短路导致的安全风险。
第二方面，本申请的实施例提供一种电芯的制造方法，用于制造上述任一项所述的电芯，所述方法包括：将通过极耳胶进行封装的电芯放置于定位装置进行定位，其中，极耳胶位于电芯的极耳和顶封部之间；利用激光沿极耳宽度方向裁切极耳胶以在极耳胶上形成弯折线，可选地，该弯折线包括避空区和/或减薄区，避空区和/或减薄区用于供极耳弯折设置。
在一些实施例中，利用具有第一能量且连续的激光裁切极耳胶以在极耳胶上形成向连续分布的避空区。
在一些实施例中，利用具有第一能量且断续的激光裁切极耳胶以在极耳胶上形成间隔分布的避空区。
在一些实施例中，利用具有第二能量的激光裁切极耳胶以在极耳胶上形成减薄区，第二能量小于第一能量。
在一些实施例中，激光为二氧化碳激光；激光脉宽为10ns至500ns，频率为500KHz至2000KHz，激光移动速率为20mm/s至50mm/s。
第三方面，本申请的实施例提供一种电池，包括：包装袋、电极组件、极耳、以及极耳胶、电路板。包装袋包括主体部及顶封部，主体部包括底壁、侧壁和顶壁，所侧壁分别与底壁和顶壁连接，顶封部连接于顶壁并朝向顶壁弯折；电极组件收容于主体部内；极耳的一端电连接于电极组件，极耳的另一端延伸出顶封部；电路板设置于顶封部背向电极组件的一侧，且电路板与电芯的极耳电连接；极耳胶位于极耳和顶封部之间；极耳胶包括延伸出顶封部的外露部，外露部设置有弯折区，极耳在弯折区弯折设置。极耳胶的外露部可以随着极耳的弯折而弯折，极耳胶弯折后在电芯长度方向上的长度得以降低，有利于提升电芯容量。
在一些实施例中，外露部包括第一子部分和第二子部分，第一子部分与顶封部连接并沿第一方向延伸，第二子部分与电路板连接并沿第一方向的反方向延伸，弯折区连接第一子部分和第二子部分。
在一些实施例中，极耳胶在弯折区处弯折所需的应力小于其余位置弯折所需的应力。
在一些实施例中，弯折区设置有避空区和/或减薄区。
在一些实施例中，弯折区包括沿第二方向相对设置的第一弯折区和第二弯 折区，弯折线设置于第一弯折区和第二弯折区之间。
在一些实施例中，避空区和/或减薄区在弯折区沿第三方向连续分布，第三方向垂直于第一方向和第二方向。避空区和/或减薄区连续分布于第一弯折区和第二弯折区之间，可视为避空区和/或减薄区沿第三方向贯穿弯折区，有利于降低避空区和/或减薄区的制备难度。
在一些实施例中，避空区和/或减薄区在弯折区上沿第三方向间隔分布，第三方向垂直于第一方向和第二方向。第一弯折区和第二弯折区之间仍然连接，而未断开，有利于提高弯折区的结构强，保护极耳，并降低第一弯折区和第二弯折区在断口处(即弯折线边缘)的毛刺等刺破封装胶纸的风险，该封装胶纸用于封装并保护电芯的头部结构，以使例如头部结构与外界电气绝缘等。
在一些实施例中，弯折区包括沿第二方向相对设置的第一弯折区和第二弯折区；沿第三方向，在极耳的至少一侧，第一弯折区的长度小于第二弯折区的长度，第三方向垂直于第一方向和第二方向。降低第一弯折区在断口处(即弯折线边缘)的毛刺等刺破封装胶纸的风险。可选地，沿第三方向，在极耳的任一侧，第二弯折区与第一弯折区的长度之差为D 0，且0.5mm＜D 0≤3.0mm。
在一些实施例中，弯折区的弯折角度为α 0，且60°≤α 0≤120°。
在一些实施例中，第一弯折区的曲率半径为R 1，第二弯折区的曲率半径为R 2，且0.1mm≤R 1≤0.5mm，0.1mm≤R 2≤0.5mm。
在一些实施例中，顶封部与电路板之间设置有粘接件，粘接件用于将电路板绝缘固定于顶封部上，可以降低电路板与顶封部的铝塑膜(例如断口处所暴露的铝塑膜)电接触的风险，并且可以降低电池长度方向上的长度。可选地，粘接件包括：双面胶、泡棉、热熔胶、硅胶中的至少一种。
第四方面，本申请的实施例提供一种电芯，包括：包装袋、电极组件、极耳和极耳胶。包装袋包括主体部及顶封部，主体部包括底壁、侧壁和顶壁，侧壁分别与底壁和顶壁连接，顶封部连接于顶壁并朝向顶壁弯折；电极组件收容于主体部内；极耳的一端电连接于电极组件，极耳的另一端延伸出顶封部；极耳胶位于极耳和顶封部之间；包装袋还包括侧封部，侧封部连接于侧壁并朝向侧壁弯折，顶封部和侧封部连接，侧封部远离顶壁的一端具有第一边，顶封部远离顶壁的一端具有第二边，第一边与第二边之间的夹角为α，且5°≤α≤60°，第二边与顶壁之间的夹角为α'，且60°≤α'≤120°。通过将顶封部进行弯折并控制夹角为α和夹角α'的阈值范围，不仅可以降低顶封部和侧封部 在弯折处发生破损的风险，还使得电芯的长度减小，从而可满足外部用电设备的尺寸要求，具有更广的应用范围。
在一些实施例中，第一边和第二边之间的夹角的开口长度为L 0，且1.0mm≤L 0≤8.0mm；可选地，1.0mm≤L 0≤3.5mm，在减小电芯在第二方向上长度的同时，降低顶封部和侧封部在弯折处发生破损的风险。
在一些实施例中，第一边突出于顶壁的高度为H 1，且1.0mm＜H 1≤4.0mm；可选地，1.0mm＜H 1≤3.7mm，或者，1.5mm＜H 1≤2.5mm，在降低顶封部和侧封部在弯折处发生破损风险的同时，减小电芯的长度。
在一些实施例中，顶封部和侧封部的铝塑膜的厚度为67μm至150μm之间，优选地86μm至115μm之间，有利于顶封部和侧封部的弯折。
在一些实施例中，电芯还包括热敏电阻，热敏电阻设置于第一边和第二边的夹角内，热敏电阻用于避免电芯在温度过高的情况下工作。
在一些实施例中，第一边和第二边的夹角内填充有填充物，填充物用于固定第一边和第二边的夹角。可选地，填充物为胶。
第五方面，本申请的实施例提供一种电池，包括电路板以及上述任一项电芯，电路板与电芯的极耳电连接。
在一些实施例中，包装袋包括相对设置的两个侧封部，电路板设置于两个侧封部之间且设置于顶壁上，电路板的两端与对应的侧封部相对设置。可以减少电路板的两端对侧封部的挤压，降低侧封部因碰撞而损坏的风险。
在一些实施例中，电路板的任一端与对应的侧封部之间的距离为W 1，且2.0mm＜W 1≤8.0mm。
在一些实施例中，顶封部与电路板之间设置有粘接件，粘接件用于将电路板绝缘固定于顶封部上，可以降低电路板与顶封部的铝塑膜(例如断口处所暴露的铝塑膜)电接触的风险，并且可以降低电池长度方向上的长度。可选地，粘接件包括：双面胶、泡棉、热熔胶、硅胶中的至少一种。
第六方面，本申请的实施例提供一种电芯的制造方法，用于制造上述任一项的电芯，所述方法包括：将电芯放置于定位夹具进行定位，其中，电芯包括主体部、顶封部和侧封部，主体部包括底壁、侧壁和顶壁，侧壁分别与底壁和顶壁连接，顶封部连接于顶壁，侧封部连接于侧壁，顶封部和侧封部连接，侧封部远离顶壁的一端具有第一边，顶封部远离顶壁的一端具有第二边；将侧封部朝向侧壁弯折；将顶封部朝向顶壁弯折，且第一边与第二边之间的夹角为α， 且5°≤α≤60°，第二边与顶壁之间的夹角为α'，且60°≤α'≤120°。
第七方面，本申请的实施例提供一种电子设备，包括负载、以及上述任一实施例的电芯或电池，该电芯或电池用于为负载供电。
如上所述，本申请实施例的电芯、电池、电芯的制造方法及电子设备，极耳胶的外露部设置有弯折线，外露部可以沿着弯折线弯折，且弯折后在电芯长度方向的长度得以降低，有利于降低电芯的封装空间以及提升电芯容量。
附图说明
图1是本申请实施例提供的一种电芯的立体结构示意图；
图2是本申请第一实施例的电芯的主视图；
图3是图2所示的电芯与电路板电连接并弯折极耳胶的示意图；
图4是图3所示的电池的区域Ⅰ的结构放大图；
图5是本申请第二实施例的电芯的主视图；
图6是图5所示的电芯的区域Ⅱ的结构放大图；
图7是本申请的电芯在未激光切割极耳胶时的结构示意图；
图8是图5所示的电芯与电路板电连接并弯折极耳胶的示意图；
图9是图8所示的电池的区域Ⅲ的结构放大图；
图10是图8所示的电池沿第一方向观察时的结构示意图；
图11是本申请一实施例的激光切割极耳胶的场景示意图；
图12是本申请一实施例的电芯的制造方法的流程示意图；
图13是图1所示的电芯的区域A的结构放大图；
图14是图1所示的电芯的区域B的结构放大图；
图15是本申请另一实施例的电芯的制造方法的流程示意图；
图16是图8所示的电池的区域Ⅲ的结构放大图；
图17是本申请第三实施例的电芯的结构示意图；
图18是图17所示的电芯的区域Ⅳ的结构放大图；
图19是本申请第四实施例的电芯的结构示意图；
图20是图19所示的电芯的区域Ⅴ的结构放大图；
图21是本申请第五实施例的电芯沿第一方向的反方向观察时的结构示意图；
图22是图21所示的电芯的区域Ⅵ的结构放大图；
图23是本申请第六实施例的电芯沿第一方向观察时的结构示意图；
图24是图23所示的电芯的区域Ⅶ的结构放大图；
图25是图22所示的电芯与电路板电连接并弯折极耳胶的示意图；
图26图25所示的电池的区域Ⅷ的结构放大图。
具体实施方式
在本申请实施例提供的一种电芯和电池中，在极耳朝向电路板弯折的结构状态下，极耳胶的外露部设置有弯折区，极耳在弯折区弯折设置，即极耳胶的外露部可以随着极耳的弯折而弯折，在弯折后，极耳胶的外露部既可以保护极耳弯折区以及极耳的朝向电路板延伸的一部分，还可以使得电芯的长度得以降低，有利于降低电芯所需的封装空间，以及有利于提升电芯的容量。
为使本申请的目的、技术方案和优点更加清楚，下面将结合具体实施例及相应的附图，对本申请的技术方案进行清楚地描述。显然，下文所描述实施例仅是本申请的一部分实施例，而非全部的实施例。在不冲突的情况下，下述各个实施例及其技术特征可相互组合，且亦属于本申请的技术方案。
第一实施例
请一并参阅图1至图4所示，本实施例的电芯10包括包装袋11、电极组件(未图示)、极耳13、以及极耳胶14。
包装袋11围设形成电芯10的形状，还可以用于限定电芯10的外观，例如，包装袋11包括顶封部11a、主体部11b和侧封部11c，电极组件设于主体部11b内，顶封部11a和极耳13由主体部11b的第一端面延伸出。主体部11b的第一端面可视为电芯10的第一端面10a，下文以此为例进行描述。主体部11b形成有收容腔，电芯10的内部元件(例如电极组件及电解液)被内置于收容腔中，利用包装袋11对内部元件进行保护，提高防护效果及安全性。
主体部11b包括底壁11b1、侧壁11b2和顶壁11b3。底壁11b1和顶壁11b3相背设置。侧壁11b2分别与底壁11b1和顶壁11b3连接。顶封部11a和侧封部11c是电极组件收容于主体部11b之后，对包装袋11封装形成的。顶封部11a与顶壁11b3连接，侧封部11c与侧壁11b2连接。
在主体部11b的顶壁11b3的第一端面10a，顶封部11a用于实现包装袋11的密封，用于避免电解液从第一端面10a泄露、以及包装袋11外的水氧等杂质从第一端面10a进入包装袋11内。该顶封部11a也对极耳13的伸出区域 进行密封，用于实现包装袋11与极耳13结合处的密封。
侧封部11c朝向侧壁11b2弯折，顶封部11a朝向顶壁11b3弯折。通过将侧封部11c和顶封部11a进行弯折，则电芯10的宽度和长度减小，从而可满足外部用电设备的尺寸要求，扩大应用范围。另外，由于侧封部11c和顶封部11a是电芯10中相对比较薄弱的部件，通过将侧封部11c和顶封部11a朝向包装袋11的主体部11b弯折，则侧封部11c和顶封部11a不容易因碰撞等原因而损坏，使得本申请实施例提供的电芯10的使用寿命长。
顶封部11a为突出于电芯10的主体部11b的结构，结合图1所示，顶封部11a并非沿第二方向y延伸，而是朝第一端面10a弯折并固定至第一端面10a，减小电芯10整体的长度，第二方向y为电芯10的长度方向。应理解，在电芯10中，请一并参阅图2所示，顶封部11a也可以未弯折，而是沿第二方向y延伸，此时极耳也未弯折，极耳13延伸方向即为第二方向y。在本申请的实施例中，电芯10的厚度方向可以为第一方向x，极耳13的宽度方向可以为第三方向z，第一方向x、第二方向y和第三方向z中的两两垂直，需要说明的是，受限于实际加工或者测量时的误差，本申请的全文中所谓的垂直并非要求两者之间的夹角必须为90°，而是允许存在±10°的偏差，即所谓垂直可理解为任意两个方向之间的夹角为80°至100°。
顶封部11a朝第一端面10a弯折并固定至第一端面10a，包括如下三种场景中的任一种：第一种场景，顶封部11a与第一端面10a至少部分区域接触，例如，顶封部11a靠近第一端面10a的一侧面的一部分与第一端面10a接触，或者，顶封部11a靠近第一端面10a的一侧面全部与第一端面10a接触。第二种场景，沿第二方向y，顶封部11a与第一端面10a之间相对设置，两者之间未接触且具有预定距离，该预定距离可以根据实际场景需求而定，例如可以大于0且小于或等于1毫米。第三种场景，顶封部11a与顶壁11b3的第一端面10a之间设置有粘接件，例如双面胶、泡棉、热熔胶、硅胶、具有粘性的散热材料等，优选为热熔胶，粘接件可以全部或部分覆盖第一端面10a，和/或，粘接件可以呈直线形或者波浪形等(本申请的实施例不限定粘接件的形状)设置于第一端面10a上，将顶封部11a粘接于顶壁11b3的第一端面10a上。
在电芯10具有正负极性的场景中，电极组件包括正极极片和负极极片、以及设于正极极片和负极极片之间的隔离膜。电极组件可以由若干极片卷绕或者叠片形成，极耳13的一端电连接于电极组件，例如伸入包装袋11内并与对 应极性的极片电连接，极耳13的另一端延伸出顶封部11a。
极耳13包括第一极耳13a和第二极耳13b，第一极耳13a为负极极耳，对应地，第二极耳13b为正极极耳。第一极耳13a与负极极片电连接，第二极耳13b与正极极片电连接，并分别延伸至包装袋11外。在其他实施例中，第一极耳13a可以为正极极耳，第二极耳13b为负极极耳。第一极耳13a和第二极耳13b的结构可以相同，也可以不相同，两者可以沿第三方向z对称设置，也可以为非对称设置。本文的某些之处以其中一个为例，描述本申请实施例的极耳13的结构。
应理解，极耳13的结构及形状，本申请的实施例不予限制。例如，极耳13可以为长方形条状结构，各自的尺寸可以根据实际需要适应性设置，材料包括但不限于为铝、镍、铜、及铜镀镍等合金。例如，正极极耳13的材料可以为铝或者铝镀镍，负极极耳13的材料可以为铜镀镍，不仅有利于改善与负极极片的电连接性能，而且可以提高负极极耳的结构强度。
极耳胶14位于极耳13和顶封部11a之间，极耳胶14与极耳13粘接，同时还与包装袋11(例如软包包装袋的铝塑膜)粘接，改善包装袋11在极耳13处的密封效果。极耳胶14可以分别设置于极耳13的第一表面和第二表面，第一表面和第二表面沿极耳13的厚度方向相对设置。
请参阅图1和图2所示，为极耳胶14未弯折状态的结构示意图；图3和图4为极耳胶14在弯折状态的结构示意图。
对于未弯折状态的极耳胶14，如图1和图2所示，极耳胶14包括延伸出顶封部11a的外露部141，该外露部141包括弯折线O、以及沿极耳13延伸方向(即第二方向y)设置的第一部分1411和第二部分1412，弯折线O设置于第一部分1411和第二部分1412之间，即弯折线O将外露部141分为相连接的第一部分1411和第二部分1412，弯折线O在极耳胶14上垂直于极耳13延伸方向y。极耳胶14可以沿着弯折线O弯折。
请一并参阅图3和图4所示，在将本实施例的电芯10与电路板21连接形成电池20的场景中，极耳胶14的外露部141沿着弯折线O弯折，当极耳胶14处于弯折状态时，电路板21可以邻近顶封部11a设置，对应地，弯折后的极耳13延伸至电路板21的背向顶封部11a的一侧(即图3和图4所示的上方)，电路板21可以通过导电件22与极耳13电连接，在该场景中，第一部分1411和第二部分1412沿第二方向y相连接设置。弯折线O可以降低极耳胶14的 弯折难度，使得极耳胶14弯折后在第二方向y上的长度得以降低，有利于降低电芯10所需的封装空间，以及有利于提升电芯10的容量。
在本实施例中，弯折线O可以是并未破坏极耳胶14结构的设计，例如仅是标识于或者未标识于极耳胶14上的一条线。
对于弯折线O是未标识于极耳胶14上的一条线的场景，请继续一并参阅图3和图4，可视的一种情况是：极耳胶14所要弯折的位置并未固定，极耳胶14的外露部141随着极耳13的弯折而弯折，并且在弯折后外露部141还设置于极耳13朝向电路板21延伸的一部分上。在一些实施例中，极耳13朝向电路板21弯折，极耳胶14的外露部141至少设置于极耳13朝向电路板21弯折的极耳弯折部133，外露部141至少设置于极耳13的极耳弯折区133和第二极耳部132，弯折后的极耳13包括第一极耳部(图未示出)、第二极耳部132和极耳弯折区133，极耳弯折区133连接于第一极耳部和第二极耳部132，第一极耳部与电极组件电连接并朝向极耳弯折区133延伸，第二极耳部132朝向电路板21延伸并与电路板21电连接，第一极耳部和第二极耳部132的延伸方向不相同，例如，如图4所示，第一极耳部沿第三方向z延伸，第二极耳部132沿第三方向z的反方向延伸，极耳弯折区133是一段弧形结构。当然，在其他实施例中，第一极耳部和第二极耳部132的延伸方向也可以并非相反，而是具有符合设计需求的角度，只需极耳弯折区133是一段弧形结构即可。需要说明的是，极耳弯折区133可以并非图4所示的具有上下两个弧形顶角，还可以是其他形状的弧形结构，例如仅具有一个弧形顶角。
在本申请的实施例中，弯折后的极耳胶14不仅设置于极耳13的弯折区(即极耳弯折区133)，还设置于极耳13的朝向电路板21延伸的一部分(即第二极耳部132)，极耳胶14的外露部141既可以保护极耳13的极耳弯折区133以及第二极耳部132，还可以使得极耳胶14弯折后在第二方向y上的长度得以降低，有利于降低电芯10所需的封装空间，以及有利于提升电芯10的容量。当然，极耳胶14还可以设置于极耳13与电极组件连接的一部分(即第一极耳部)。
在第一方向x上，如图3和图4所示，电路板21可以未超出主体部11b的厚度范围，有利于降低电芯10的整体厚度。在其他实施例中，电路板21的一端(例如电路板21背向外露部141的一端)可以超出主体部11b，在电芯10与用电设备(例如电池仓)配合时，电路板21超出主体部11b的一端可 以与用电设备的空间相结合，以实现装配的稳定性。
在一些实施例中，顶封部11a与电路板21之间可以设置有粘接件(图未示出)，粘接件用于将电路板21绝缘固定于顶封部11a上，例如固定于顶封部11a背向电芯10的侧面上，可以降低电路板21与顶封部11a的铝塑膜(例如断口处所暴露的铝塑膜)电接触的风险，并且可以降低电池10在第二方向y上的长度。可选地，粘接件包括：双面胶、泡棉、热熔胶、硅胶中的至少一种，或者，其他具有粘性的绝缘散热材料。粘接件可以全部或部分覆盖顶封部11a(和/或顶封部11a与电路板21的重叠区域)，和/或，粘接件可以呈直线形或者波浪形等设置，本申请的实施例不限定粘接件的形状。
第二实施例
本申请的各个实施例采用相同标号标识相同名称的结构元件。在前述实施例的描述基础上，但与其不同的是，本实施例的弯折线O具体实现为避空区141d，即，弯折线O是破坏极耳胶14结构的设计。
对于未弯折状态的极耳胶14，如图5至图7所示，极耳胶14包括延伸出顶封部11a的外露部141，外露部141包括沿极耳13延伸方向(即第二方向y)相对设置的第一部分1411和第二部分1412，避空区141d设置于第一部分1411和第二部分1412之间，避空区141d在极耳胶14上形成垂直于极耳13延伸方向y的所述弯折线O，在弯折线处O，极耳胶14的厚度为零。
对于弯折状态的极耳胶14，如图8和图9所示，极耳胶14的外露部141包括第一子部分141a、弯折区141b和第二子部分141c，第一子部分141a与顶封部11a连接并沿第一方向x延伸，第二子部分141c与第一子部分141a沿第二方向y相对设置，第二子部分141c与电路板21连接并沿第一方向x的反方向延伸，弯折区141b连接于第一子部分141a和第二子部分141c之间，弯折区141b设置有避空区141d。其中，电芯10在由图5和图6的状态变为图8和图9的状态后，第一部分1411形变成为第一子部分141a，第一子部分141a设置于第一极耳部，第二部分1412形变成为弯折区141b和第二子部分141c，第二子部分141c设置于第二极耳部132，弯折区141b设置于极耳弯折区133。
避空区141d可以降低极耳胶14的弯折难度，极耳13和极耳胶14弯折后在电芯10长度方向(即第二方向y)上的长度得以降低，有利于降低电芯10所需的封装空间，以及有利于提升电芯10的容量。
在一些实施例中，在极耳胶14弯折后，如图9所示，避空区141d与顶封部11a之间的距离为W 0，且0.2mm＜W 0≤1.0mm，通过减小W 0，有利于极耳13和极耳胶14的弯折；可选地，W 0＝0.5mm，既有利于极耳13和极耳胶14的弯折，还可以减小电芯10的厚度(即第一方向x的长度)。
另外，请参阅图1和图13所示，顶封部11a的宽度(即沿极耳13延伸方向顶封部11a的长度)为H 2，且1.0mm＜H 2≤4.0mm。通过减小H 2，不仅有利于降低电芯10的厚度，还可以有利于在电芯10厚度方向上设置较长的外露部141，从而有利于极耳13和极耳胶14的弯折。
弯折区141b在第二方向y上的长度可理解为：沿第一方向x观察，弯折区141b的正投影在第二方向y上的长度。沿第二方向y，极耳胶14在未弯折状态的长度大于弯折状态的长度，对应地，如图5至图7所示，弯折区141b在弯折前均沿第二方向y延伸，第一子部分141a和第二子部分141c在弯折前均沿第二方向y延伸且相对设置，而在弯折后，第一子部分141a沿第一方向x延伸，第二子部分141c沿第一方向x的反方向延伸；避空区141d在第二方向y上的长度在未弯折状态的大于弯折状态的。
请一并参阅图8和图9所示，弯折区141b包括沿第二方向y相对设置的第一弯折区141e和第二弯折区141f，避空区141d设置于第一弯折区141e和第二弯折区141f之间。在本实施例中，在电芯10处于未弯折状态时，避空区141d在外露部141上垂直于极耳13延伸方向连续分布，在电芯10处于弯折状态时，避空区141d在弯折区141b上沿第三方向z连续分布，可以视为避空区141d沿第三方向z贯穿弯折区141b。
在一些实施例中，在极耳胶14弯折后，如图9所示，外露部141在极耳13的弯折处的弯折角度为α 0，且60°≤α 0≤120°，有利于极耳13和极耳胶14的弯折。该弯折角度α 0可理解为：弯折区141b弯折后的夹角角度，以弯折区141b包括沿第二方向y相对设置的弧形的第一弯折区141e和第二弯折区141f为例，第一弯折区141e的切线和第二弯折区141f的切线之间的夹角角度。
如图8和图9所示，第一弯折区141e和第二弯折区141f均为一段弧形结构，第一弯折区141e的曲率半径为R 1，第二弯折区141f的曲率半径为R 2，曲率半径R 1可以理解为与第一弯折区141e的一端、第一弯折区141e的另一端、以及第一弯折区141e上的一端和另一端的中间点的距离均相等的长度， 曲率半径为R 2可以理解为与第二弯折区141f的一端、第二弯折区141f的另一端、以及第二弯折区141f上的一端和另一端的中间点的距离均相等的长度。在一些场景中，0.1mm≤R 1≤0.5mm，0.1mm≤R 2≤0.5mm，通过减小第一弯折区141e和第二弯折区141f的曲率半径，减小第一弯折区141e和第二弯折区141f的曲率，降低弯折区141b弯折后在第二方向y上的长度，有利于降低电芯10所需的封装空间，以及提升电芯10的容量。
在另一些场景中，沿第二方向y，如图5至图7所示，外露部141的高度为H 0，且0.2mm＜H 0≤3.0mm，通过减少H 0，有利于降低极耳胶14在弯折后的高度，以此降低电芯10(沿第二方向y)的高度，从而可以降低电芯10所需的封装空间(例如容置电芯10的电池仓的高度)。
在一些场景中，如图11所示，避空区141d可以通过激光切割工艺制得。请参阅图11和图12所示，电芯的制造方法包括如下步骤S11和S12。
S11：将通过极耳胶进行封装的电芯放置于定位装置进行定位，其中，极耳胶位于电芯的极耳和顶封部之间。
S12：利用激光沿极耳宽度方向裁切极耳胶以在极耳胶上形成弯折线。
极耳13和极耳胶14未弯折的电芯10放置于预定区域，并且被定位装置71定位，激光发生装置72可以产生二氧化碳激光；激光脉宽为10ns至500ns，频率为500KHz至2000KHz，激光移动速率为20mm/s至50mm/s。激光发生装置72沿第三方向z对极耳胶14的一侧(即位于极耳13一侧面上的极耳胶14)进行切割，然后将电芯10翻转并对极耳胶14的另一侧(即位于极耳13另一侧面上的极耳胶14)进行切割，以此制得避空区141d。在激光切割过程中，利用具有第一能量且连续的激光裁切极耳胶14，以在极耳胶14上形成向连续分布的避空区141d，连续分布的避空区141d有利于降低制备难度。
在一些实施例中，沿第二方向y，避空区141d在弯折前的长度可以大于弯折后的长度，如图9所示，避空区141d在弯折后的长度为D 1，且0＜D 1≤0.4mm。通过减小避空区141d在第二方向y上的长度，使得第一弯折区141e和第二弯折区141f之间的距离D 1减小，可以降低避空区141d边缘(即第一弯折区141e和第二弯折区141f在被切割边缘)的毛刺等刺破封装胶纸的风险，该封装胶纸用于封装并保护电芯10的头部结构，以使头部结构(例如顶封部11a、电路板21)与外界隔绝(包括电气绝缘)等。
在一些实施例中，请一并结合图8和图9所示，沿第二方向y，第一弯折 区141e在弯折后的长度为D 2，且0.2mm≤D 2≤1.0mm，通过减小D 2，可以降低第一弯折区141e在断口处(即被切割边缘)的毛刺等刺破封装胶纸的风险。第一弯折区141e在弯折后的长度可理解为：沿第一方向x观察，第一弯折区141e的正投影在第二方向y上的长度。
在一些实施例中，如图9所示，弯折区141b在第一方向x上的长度为D 3，且0.1mm≤D 33≤0.5mm，通过减小D 3，降低弯折区141b在电芯10厚度方向(即第一方向x)上的长度，有利于降低电芯10整体的厚度。弯折区141b在第一方向x上的长度可理解为：沿第二方向y观察，弯折区141b(包括第一弯折区141e和第二弯折区141f)的正投影在第一方向x上的长度。
请一并参阅图1、图13至图15所示，顶封部11a朝向顶壁11b3弯折，则顶封部11a和侧封部11c相交的部分形成折角11d。折角11d的制备工艺，本申请的实施例不予以限制，例如，包括如下步骤S21至S23。
S21：将电芯放置于定位夹具进行定位，其中，电芯包括主体部、顶封部和侧封部，主体部包括底壁、侧壁和顶壁，侧壁分别与底壁和顶壁连接，顶封部连接于顶壁，侧封部连接于侧壁，顶封部和侧封部连接，侧封部远离顶壁的一端具有第一边，顶封部远离顶壁的一端具有第二边。
S22：将侧封部朝向侧壁弯折。
S23：将顶封部朝向顶壁弯折，且第一边与第二边之间的夹角为α，且5°≤α≤60°，第二边与顶壁之间的夹角为α'，且60°≤α'≤120°。
在一些场景中，可以先将电芯10放置于定位夹具中予以定位，然后通过定位夹具的第一部件弯折侧封部，该第一部件推动侧封部并使其朝向侧壁11b2弯折，再通过定位夹具的第二部件弯折顶封部11a，该第二部件推动顶封部11a朝向顶壁11b3弯折，以得到弯折后的折角11d，第一部件可以为沿第二方向y延伸的条状件，第二部件为沿第三方向z延伸的条状件，第一部件和第二部件还可用于定位电芯10。可选地，再通过定位块沿第二方向y的反方向推动顶封部11a，对弯折后的折角11d进行整形，最终得到折角11d。
侧封部11c远离顶壁11b3的一端具有第一边11c1，顶封部11a远离顶壁11b3的一端具有第二边11a1，第一边11c1和第二边11a1可视为折角11d的两条边。第一边11c1与第二边11a1之间的夹角为α，且5°≤α≤60°，第二边11a1与顶壁11b3之间的夹角为α'，且60°≤α'≤120°。通过将顶封部11a进行弯折并控制折角11d，使得夹角为α和夹角α'位于上述阈值范围内， 不仅可以降低顶封部11a和侧封部11c在弯折处因应力发生破损的风险，还可以使得电芯10在第二方向y上的长度减小，从而可满足外部用电设备的尺寸要求，具有更广的应用范围。
例如，5°≤α≤45°，在工艺上较容易制得折角11d；5°≤α≤30°或者30°≤α≤45°，折角11d的应力较小，折角11d发生破损的风险较小；10°≤α≤30°，折角11d的外形较为美观；10°≤α≤20°，折角11d的应力较小，并且外形较为美观。又例如，75°≤α'≤105°或者85°≤α'≤100°或者85°≤α'≤90°，折角11d几乎垂直于顶壁11b3，在与外部用电设备(例如电池仓)配合时可以降低宽度方向(例如第三方向z)的长度。
在一些实施例中，第一边11c1与第二边11a1的夹角(即折角11d)的开口长度为L 0，且1.0mm≤L 0≤8.0mm；可选地，1.0mm≤L 0≤3.5mm。应理解，如图10所示，折角11d的开口长度为L 0可以理解为：第一边11c1与顶壁11b3相交的点和第二边11a1与顶壁11b3相交的点之间的距离。通过控制折角11d的开口长度，在减小电芯10在第二方向y上长度的同时，尽可能的降低顶封部11a和侧封部11c在弯折处因应力发生破损的风险。
在一些实施例中，第一边11c1突出于顶壁11b3的高度为H 1，且1.0mm＜H 1≤4.0mm；可选地，1.0mm＜H 1≤3.7mm，或者，1.5mm＜H 1≤2.5mm，在降低顶封部11a和侧封部11c在弯折处发生破损风险的同时，尽可能减小电芯10在第二方向y上的长度。
在包装袋11采用铝塑膜的场景中，顶封部11a和侧封部11c的铝塑膜的厚度最佳可以为86μm至115μm之间，有利于11a和侧封部11c弯折形成折角11d以及在形成折角11d的过程中避免发生破损，当然，也可以在67μm至86μm之间或者86μm至115μm之间。
电芯10还可以包括热敏电阻(未图示)，热敏电阻与电路板21通过导线连接，该导线可设于第一端面10a上，热敏电阻避免电芯10在温度过高的情况下工作。热敏电阻可以设置于折角11d内，以充分利用折角11d空间。
在其他实施例中，折角11d内可以填充有填充物，填充物用于固定折角11d的形态以降低该折角11d发生形变甚至破损。在一些场景中，填充物可以为胶水等，胶水填充于折角11d内固化即可。当然，填充物也可以包裹热敏电阻(或者也包裹与其连接的导线)，用以保护热敏电阻。
请继续一并参阅图1至图10，包装袋11可以包括沿第三方向z相对设置 的两个侧封部11c，对应地，包装袋11形成有两个折角11d，电路板21可以设置于两个折角11d(或者侧封部11c)之间且设置于顶壁11b3上，电路板21的两端与对应的侧封部11c相对设置。电路板21的两端分别与两个折角11d之间未接触，可以减少电路板21的两端对侧封部11c的挤压，降低侧封部11c因碰撞而损坏的风险。可选地，如图10所示，电路板21的任一端与对应的侧封部11c之间的距离(即沿第三方向z的长度)为W 1，且2.0mm＜W 1≤8.0mm，通过控制W 1，既可以减少电路板21对侧封部11c的挤压，还可以有利于降低电池20沿第三方向z的长度(即电池20的宽度)。
第二实施例
本申请的各个实施例采用相同标号标识相同名称的结构元件。在前述实施例的描述基础上，但与其不同的是，如图1和图16所示，外露部141设置有减薄区141g，减薄区141g在极耳胶14上形成弯折线O。相比较于避空区141d，该减薄区141g并未将极耳胶14断开，而仅是将极耳胶14在该减薄区141g的厚度减薄，减薄区141g的厚度小于其余位置的厚度。
减薄区141g的位置、形状、尺寸等可以与避空区141d的相同，于此，外露部141在沿减薄区141g形成的弯折线O弯折后的结构形态以及由此产生的有益效果，可以参阅前述，此处不再予以赘述。
在采用激光切割工艺形成减薄区141g的过程中，利用第二能量的激光裁切极耳胶14以在极耳胶14上形成减薄区141g，该第二能量小于第一能量，第一能量为裁切形成避空区141d的激光能量。
需要说明的是，本申请下文的所有实施例均以避空区141d形成弯折线O为例进行描述，但这仅是为了便于示例性说明，下文的各个实施例的避空区141d也可以设置为减薄区141g，或者同时设置避空区141d和减薄区141g。
第三实施例
在前述实施例的描述基础上，但与其不同的是，如图17和图18所示，为极耳胶14未弯折状态的结构示意图。在本实施例的电芯10中，在电芯10处于未弯折状态时，避空区141d在外露部141上垂直于极耳13延伸方向间隔分布，在电芯10处于弯折状态时，避空区141d在弯折区141b上沿第三方向z间隔分布。第一弯折区141e和第二弯折区141f之间仍然连接，而未完全断开， 以此有利于提高弯折区141b的结构强度，提高极耳13的保护效果，并降低第一弯折区141e和第二弯折区141f在断口处(即避空区141d边缘)的毛刺等刺破封装胶纸的风险。
在采用图8和图9所示的激光切割工艺的场景中，利用具有第一能量且断续的激光裁切极耳胶14，以在极耳胶14上形成向连续分布的避空区141d，例如，先采用第一能量且连续的激光形成一个避空区141d，然后中断激光的能量(即不产生激光)，在下一个避空区141所在位置再采用第二能量且连续的激光形成一个避空区141d，直至形成间隔分布的多个避空区141。
各个避空区141d的形状可以为图17和图18所示的矩形，也可以为圆形、三角形等其他类型的多边形，本申请的实施例不予以限定。
另外，每一极耳13处的极耳胶14所设置的避空区141d的数量，本实施例不予以限定，图17和图18所示的四个避空区141d仅为示例性展示。
第四实施例
在前述第一实施例的描述基础上，但与其不同的是，请一并参阅图19和图20所示，为极耳胶14未弯折状态的结构示意图。沿第三方向z，第一弯折区141e在弯折前和弯折后的长度保持不变，第二弯折区141f在弯折前和弯折后的长度也保持不变。为便于描述，本实施例在未弯折状态的图19和图20中标识第一弯折区141e和第二弯折区141f的长度之差。
在本实施例的电芯10中，在电芯10处于未弯折状态时，沿垂直于极耳13延伸方向y，在极耳13的至少一侧(例如图19所示的左侧和右侧)，第一部分1411的长度小于第二部分1412的长度，在电芯10处于弯折状态时，沿第三方向z，在极耳13的第一侧和第二侧(即图20所示的左侧和右侧)，第二弯折区141f的长度均小于第一弯折区141e的长度，降低第二弯折区141f在断口处的毛刺等刺破封装胶纸的风险。
可选地，沿第三方向z，在极耳13的左侧或者右侧，第二弯折区141f与第一弯折区141e的长度之差为D 0，且0.5mm＜D 0≤3.0mm。应该理解的是，在极耳13的左侧或者右侧，第二弯折区141f与第一弯折区141e的长度之差可以相等、也可以不相等；或者，第二弯折区141f与第一弯折区141e仅在其中一侧具有长度之差，而在另一侧的长度相等(即平齐)。
在其他实施例中，沿第三方向z，可以仅在极耳13的至少一侧，设置第 一弯折区141e的长度小于第二弯折区141f的长度。
第五实施例
在前述实施例的描述基础上，但与其不同的是，如图21至图24所示，为极耳胶14未弯折状态的结构示意图，如图25和图26所示，为极耳胶14弯折状态的结构示意图。
在图25和图26所示的场景中，第一侧部位于极耳13的左侧，第二侧部位于极耳13的右侧。
在本实施例中，避空区141d设置于弯折区141b的第二侧部，即，弯折区141b在极耳13的右侧设置避空区141d，避空区141d可以降低极耳胶14的弯折难度，而极耳胶14在极耳13的内侧未设置避空区141d，内侧的极耳胶14可以降低极耳13与电路板21及顶封部11a裁切口的铝塑膜电接触的风险，从而从整体上降低电芯10发生短路导致的安全风险。
如图26，沿第二方向y，位于极耳13朝向顶封部11a一侧的极耳胶14的长度为D 4，且0.5mm＜D 4≤2.5mm，通过增大极耳13朝向顶封部11a一侧的极耳胶14在第二方向y上的长度，可以降低极耳13与电路板21及顶封部11a裁切口的铝塑膜电接触的风险。
请继续参阅图25和图26，在将本实施例的电芯10与电路板21连接形成电池20的场景中，电路板21可以邻近顶封部11a设置，对应地，极耳13弯折后延伸至电路板21的背向顶封部11a的一侧(即上方)，为适应该场景所需，极耳胶14可以仅包括第一子部分141a和弯折区141b，弯折区141b可以包括两部分，与第一子部分141a连接的其中一部分可相当于前述实施例所描述的第一弯折区141e，另一部分可以沿第二方向y延伸而未发生弯折，可以减少极耳胶14发生弯折的部位，降低极耳胶14因弯折发生破裂的风险。
应理解，前述各个实施例也可以采用本实施例的设置，即，弯折区141b在极耳13的外侧设置各个实施例对应的避空区141d，而内侧未设置避空区141d，也可以降低电芯10发生短路导致的安全风险。
本申请的实施例还提供一种电池，如图8至图9、图25和图26所示，该电池20包括电路板21、以及上述任一项实施例的电芯10，电路板21设置于 顶封部11a背向电极组件的一侧，且电路板21与电芯10的极耳13电连接，例如电路板21通过导电件22与极耳13电连接。可选地，如图8至图9、图25和图26所示，电路板21固定于顶封部11a的上表面，降低电池20的头部结构在第二方向y上的长度，从而有利于降低电池20的头部空间。
电路板21所适用的电池20的类型，本申请的实施例不予以限定，电路板21的形状、尺寸及功用等，可根据应用场景而定。例如，在一些场景中，电路板21可以为刚性电路板，例如印制电路板(Printed Circuit Board,PCB)，或者柔性电路板(Flexible Printed Circuit,FPC)，电路板21可以集成有BMS(Battery management system,电池管理系统)，用于对电芯10的充放电进行控制，确保安全。
在具体场景中，电池20包括但不限于所有种类的原电池、二次电池、燃料电池、太阳能电池和电容器(例如超级电容器)电池，可以为软包电池。电池20可优选为锂二次电池。本申请的实施例的电池20可以以单个电池、电池单元或者电池模组的形式存在。
本申请的实施例还提供一种电子设备，包括负载以及上述任一实施例的电池20或者电芯10，电池20或者电芯10为负载供电。
电子设备可以以各种具体形式来实施，例如，无人机、电动车、电动清洁工具、储能产品、电动汽车、电动自行车、电动导航工具等电子产品。在实用场景中，电子设备具体包括但不限于为：备用电源、电机、汽车、摩托车、助力自行车、自行车电动工具、家庭用大型蓄电池和锂离子电容器等。
本领域技术人员可理解的是，除特别用于移动目的的元件之外，根据本申请实施例的构造也能够应用于固定类型的电子设备。
由于电池20和电子设备具有前述任一实施例的电芯10，因此，该电池20和电子设备能够产生对应实施例的电芯10具有的有益效果。
应该理解的是，以上所述仅为本申请的部分实施例，并非因此限制本申请的专利范围，对于本领域普通技术人员而言，凡是利用本说明书及附图内容所作的等效结构变换，均同理包括在本申请的专利保护范围内。
尽管本文采用术语“第一、第二”等描述各种信息，但这些信息不应限于这些术语。这些术语仅用来将同一类型的信息彼此区分开。本文中所使用的， 单数形式“一”、“一个”和“该”旨在也包括复数形式。术语“或”和“和/或”被解释为包括性的，或意味着任一个或任何组合。仅当元件、功能、步骤或操作的组合在某些方式下内在地互相排斥时，才会出现该定义的例外。
另外，在本申请实施例的描述中，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请相应实施例的技术方案和简化描述，而非指示或暗示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。

Claims (42)

  1. 一种电芯，包括：
    包装袋，所述包装袋包括主体部及顶封部，所述主体部包括底壁、侧壁和顶壁，所述侧壁分别与所述底壁和所述顶壁连接，所述顶封部连接于所述顶壁并朝向所述顶壁弯折；
    电极组件，所述电极组件收容于所述主体部内；
    极耳，所述极耳的一端电连接于所述电极组件，所述极耳的另一端延伸出所述顶封部；
    极耳胶，所述极耳胶位于所述极耳和所述顶封部之间；
    其中，
    所述极耳胶包括延伸出所述顶封部的外露部，所述外露部设置有避空区和/或减薄区，所述避空区和/或所述减薄区用于供所述极耳弯折设置。
  2. 根据权利要求1所述的电芯，其中，所述外露部包括沿所述极耳延伸方向相对设置的第一部分和第二部分，所述避空区和/或所述减薄区设置于所述第一部分和所述第二部分之间。
  3. 根据权利要求2所述的电芯，其中，所述避空区和/或减薄区在所述外露部上垂直于所述极耳延伸方向连续分布。
  4. 根据权利要求2所述的电芯，其中，所述避空区和/或减薄区在所述外露部上垂直于所述极耳延伸方向间隔分布。
  5. 根据权利要求1所述的电芯，其中，所述外露部包括沿所述极耳延伸方向相对设置的第一部分和第二部分；沿垂直于所述极耳延伸方向，在所述极耳的至少一侧，所述第一部分的长度小于所述第二部分的长度。
  6. 根据权利要求5所述的电芯，其中，沿垂直于所述极耳延伸方向，在所述极耳的至少一侧，所述第二部分与第一部分的长度之差为D 0，且0.5mm＜D 0≤3.0mm。
  7. 根据权利要求1所述的电芯，其中，所述避空区和/或所述减薄区与所述顶封部之间的距离为W 0，且0.2mm＜W 0≤1.0mm。
  8. 根据权利要求7所述的电芯，其中，W 0＝0.5mm。
  9. 根据权利要求1所述的电芯，其中，沿所述极耳延伸方向，所述外露部的长度为H 0，且0.2mm＜H 0≤3.0mm。
  10. 根据权利要求9所述的电芯，其中，沿所述极耳延伸方向，所述顶封部的长度为H 2，且1.0mm＜H 2≤4.0mm。
  11. 根据权利要求1至10任一项所述的电芯，其中，所述避空区和/或所述减薄区设置于所述外露部的位于所述极耳的其中一侧。
  12. 一种电芯的制造方法，用于制造如上述权利要求1至11任一项所述的电芯，其中，所述方法包括：
    将通过极耳胶进行封装的电芯放置于定位装置进行定位，其中，所述极耳胶位于所述电芯的极耳和顶封部之间；
    利用激光沿所述极耳宽度方向裁切所述极耳胶以在所述极耳胶上形成避空区和/或减薄区，所述避空区和/或所述减薄区用于供所述极耳弯折设置。
  13. 根据权利要求12所述的方法，其中，利用具有第一能量且连续的激光裁切所述极耳胶以在所述极耳胶上形成向连续分布的所述避空区。
  14. 根据权利要求12所述的方法，其中，利用具有第一能量且断续的激光裁切所述极耳胶以在所述极耳胶上形成间隔分布的所述避空区。
  15. 根据权利要求13或14所述的方法，其中，利用具有第二能量的激光裁切所述极耳胶以在所述极耳胶上形成所述减薄区，所述第二能量小于所述第一能量。
  16. 根据权利要求12所述的方法，其中，所述激光为二氧化碳激光；所述激光脉宽为10ns至500ns，频率为500KHz至2000KHz，所述激光移动速率为20mm/s至50mm/s。
  17. 一种电池，包括：
    包装袋，所述包装袋包括主体部及顶封部，所述主体部包括底壁、侧壁和顶壁，所述侧壁分别与所述底壁和所述顶壁连接，所述顶封部连接于所述顶壁并朝向所述顶壁弯折；
    电极组件，所述电极组件收容于所述主体部内；
    极耳，所述极耳的一端电连接于所述电极组件，所述极耳的另一端延伸出所述顶封部；
    其中，所述电池还包括：
    极耳胶，所述极耳胶位于所述极耳和所述顶封部之间，所述极耳胶包括延伸出所述顶封部的外露部，所述外露部设置有弯折区，所述极耳在所述弯折区弯折设置；
    电路板，所述电路板设置于所述顶封部背向所述电极组件的一侧，且所述电路板与所述电芯的极耳电连接。
  18. 根据权利要求17所述的电池，其中，所述外露部包括第一子部分和第二子部分，所述第一子部分与所述顶封部连接并沿第一方向延伸，所述第二子部分与所述电路板连接并沿所述第一方向的反方向延伸，所述弯折区连接所述第一子部分和所述第二子部分。
  19. 根据权利要求18所述的电池，其中，所述弯折区设置有避空区和/或减薄区。
  20. 根据权利要求19所述的电池，其中，所述弯折区包括沿第二方向相对设置的第一弯折区和第二弯折区，所述第二方向垂直于所述第一方向，所述避空区和/或所述减薄区设置于所述第一弯折区和第二弯折区之间。
  21. 根据权利要求20所述的电池，其中，所述避空区和/或减薄区在所述弯折区沿第三方向连续分布或者间隔分布，所述第三方向垂直于所述第一方向和所述第二方向。
  22. 根据权利要求18所述的电池，其中，所述弯折区包括沿第二方向相对设置的第一弯折区和第二弯折区，所述第二方向垂直于所述第一方向；沿第三方向，在所述极耳的至少一侧，所述第一弯折区的长度小于第二弯折区的长度，所述第三方向垂直于所述第一方向和所述第二方向。
  23. 根据权利要求22所述的电池，其中，沿所述第三方向，在所述极耳的任一侧，所述第二弯折区与第一弯折区的长度之差为D 0，且0.5mm＜D 0≤3.0mm。
  24. 根据权利要求20至23任一项所述的电池，其中，所述第一弯折区的曲率半径为R 1，所述第二弯折区的曲率半径为R 2，且0.1mm≤R 1≤0.5mm，0.1mm≤R 2≤0.5mm。
  25. 根据权利要求17至23任一项所述的电池，其中，所述弯折区的弯折角度为α 0，且60°≤α 0≤120°。
  26. 根据权利要求17至23任一项所述的电池，其中，所述顶封部与所述电路板之间设置有粘接件，所述粘接件用于将所述电路板绝缘固定于所述顶封部上，所述粘接件包括：双面胶、泡棉、热熔胶、硅胶中的至少一种。
  27. 一种电芯，包括：
    包装袋，所述包装袋包括主体部及顶封部，所述主体部包括底壁、侧壁和顶壁，所述侧壁分别与所述底壁和所述顶壁连接，所述顶封部连接于所述顶壁 并朝向所述顶壁弯折；
    电极组件，所述电极组件收容于所述主体部内；
    极耳，所述极耳的一端电连接于所述电极组件，所述极耳的另一端延伸出所述顶封部；
    极耳胶，所述极耳胶位于所述极耳和所述顶封部之间；
    其中，所述包装袋还包括侧封部，所述侧封部连接于所述侧壁并朝向所述侧壁弯折，所述顶封部和所述侧封部连接，所述侧封部远离所述顶壁的一端具有第一边，所述顶封部远离所述顶壁的一端具有第二边，所述第一边与所述第二边之间的夹角为α，且5°≤α≤60°，所述第二边与所述顶壁之间的夹角为α'，且60°≤α'≤120°。
  28. 根据权利要求27所述的电芯，其中，所述第一边和所述第二边之间的夹角的开口长度为L 0，且1.0mm≤L 0≤8.0mm。
  29. 根据权利要求28所述的电芯，其中，1.0mm≤L 0≤3.5mm。
  30. 根据权利要求27所述的电芯，其中，所述第一边突出于所述顶壁的高度为H 1，且1.0mm＜H 1≤4.0mm。
  31. 根据权利要求30所述的电芯，其中，1.0mm＜H 1≤3.7mm。
  32. 根据权利要求30所述的电芯，其中，1.5mm＜H 1≤2.5mm。
  33. 根据权利要求27所述的电芯，其中，所述顶封部和所述侧封部的铝塑膜的厚度为67μm至150μm之间。
  34. 根据权利要求33所述的电芯，其中，所述顶封部和所述侧封部的铝塑膜的厚度为86μm至115μm之间。
  35. 根据权利要求27至34任一项所述的电芯，其中，所述电芯还包括热敏电阻，所述热敏电阻设置于所述第一边和所述第二边的夹角内。
  36. 根据权利要求27至34任一项所述的电芯，其中，所述第一边和所述第二边的夹角内填充有填充物，所述填充物用于固定所述第一边和所述第二边的夹角。
  37. 一种电芯的制造方法，用于制造如上述权利要求27至36任一项所述的电芯，其中，所述方法包括：
    将电芯放置于定位夹具进行定位，其中，所述电芯包括主体部、顶封部和侧封部，所述主体部包括底壁、侧壁和顶壁，所述侧壁分别与所述底壁和所述顶壁连接，所述顶封部连接于所述顶壁，所述侧封部连接于所述侧壁，所述顶 封部和所述侧封部连接，所述侧封部远离所述顶壁的一端具有第一边，所述顶封部远离所述顶壁的一端具有第二边；
    将所述侧封部朝向所述侧壁弯折；
    将所述顶封部朝向所述顶壁弯折，且所述第一边与所述第二边之间的夹角为α，且5°≤α≤60°，所述第二边与所述顶壁之间的夹角为α'，且60°≤α'≤120°。
  38. 一种电池，其中，包括电路板以及权利要求27至36任一项所述的电芯，所述电路板与所述电芯的极耳电连接。
  39. 根据权利要求38所述的电池，其中，所述包装袋包括相对设置的两个所述侧封部，所述电路板设置于两个所述侧封部之间且设置于所述顶壁上，所述电路板的两端与对应的所述侧封部相对设置。
  40. 根据权利要求38所述的电池，其中，所述电路板的任一端与对应的所述侧封部之间的距离为W 1，且2.0mm＜W 1≤8.0mm。
  41. 根据权利要求39至40任一项所述的电池，其中，所述顶封部与所述电路板之间设置有粘接件，所述粘接件用于将所述电路板绝缘固定于所述顶封部上，所述粘接件包括：双面胶、泡棉、热熔胶、硅胶中的至少一种。
  42. 一种电子设备，其中，包括负载，以及权利要求1至11任一项、或者权利要求27至36任一项所述的电芯、或者权利要求17至26任一项、或者权利要求38至41任一项所述的电池，所述电芯或电池用于为所述负载供电。
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CN112467261A (zh) * 2020-11-24 2021-03-09 东莞新能德科技有限公司 电池和使用电池的装置
CN214589035U (zh) * 2021-02-05 2021-11-02 东莞新能德科技有限公司 一种电池以及电子设备
CN113611986A (zh) * 2021-07-30 2021-11-05 东莞新能德科技有限公司 电芯、电池及电子设备

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CN117283031A (zh) * 2023-09-25 2023-12-26 广东金晟新能源股份有限公司 一种用于软包电池的极耳自动裁切设备及工艺
CN117283031B (zh) * 2023-09-25 2024-04-05 广东金晟新能源股份有限公司 一种用于软包电池的极耳自动裁切设备及工艺
CN117423959A (zh) * 2023-12-15 2024-01-19 珠海冠宇电池股份有限公司 电池及用电装置
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