WO2022166804A1 - 电芯、电池及电子设备 - Google Patents

电芯、电池及电子设备 Download PDF

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Publication number
WO2022166804A1
WO2022166804A1 PCT/CN2022/074540 CN2022074540W WO2022166804A1 WO 2022166804 A1 WO2022166804 A1 WO 2022166804A1 CN 2022074540 W CN2022074540 W CN 2022074540W WO 2022166804 A1 WO2022166804 A1 WO 2022166804A1
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WIPO (PCT)
Prior art keywords
tabs
inner tabs
battery
main body
extension portion
Prior art date
Application number
PCT/CN2022/074540
Other languages
English (en)
French (fr)
Inventor
于文超
王晓莹
汤健华
Original Assignee
华为技术有限公司
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
Priority claimed from CN202110221531.3A external-priority patent/CN114914552A/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2022166804A1 publication Critical patent/WO2022166804A1/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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0585—Construction or manufacture of accumulators having only flat construction elements, i.e. flat positive electrodes, flat negative electrodes and flat separators
    • 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
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H01M10/0587—Construction or manufacture of accumulators having only wound construction elements, i.e. wound positive electrodes, wound negative electrodes and wound separators

Definitions

  • the present application relates to the field of battery technology, and in particular, to a battery cell, a battery and an electronic device.
  • the present application provides a battery cell, a battery and an electronic device capable of reducing the loss of battery capacity while ensuring the charging performance.
  • the present application provides a battery cell, which can be used in a battery.
  • the battery core includes a first pole piece, a second pole piece, a plurality of first inner tabs, and a plurality of second inner tabs.
  • the first pole piece includes a first main body portion and a first extension portion, the first extension portion and the plurality of first inner tabs are connected to the top edge of the first main body portion and are spaced from each other, the first main body portion, the first extension portion and the The plurality of first inner tabs are integrally formed.
  • the second pole piece includes a second body portion and a second extension portion. The second extension portion and the plurality of second inner tabs are connected to the top edge of the second body portion and are spaced apart from each other.
  • the second body portion, the second extension portion and the The plurality of second inner tabs are integrally formed.
  • the first pole piece and the second pole piece are stacked together in a winding arrangement and spaced apart from each other, a plurality of first inner tabs are arranged in alignment, a plurality of second inner tabs are arranged in alignment, and the first extension portion and the second extension portion are arranged in alignment .
  • the first extension portion and the plurality of second inner tabs are arranged staggered, and the second extension portion and the plurality of first inner tabs are arranged in a staggered manner.
  • the battery improves the internal resistance of the battery through the multi-pole ear technology, and improves the charging performance of the battery.
  • a first extension part is arranged around the first inner tab
  • a second extension part is arranged around the second inner tab
  • the second extension part is aligned with the first extension part
  • the first extension part and the second extension part are aligned.
  • the extension parts together form a capacity expansion area of the battery cell.
  • the battery can use the expansion area around the inner tab, which can reduce the loss of the head space of the cell, and realize the capacity supplement at the non-tab arrangement of the cell, so as to ensure the charging performance and reduce the loss of battery capacity. Makes the battery capacity larger.
  • first pole piece and the plurality of first inner pole tabs are integrally formed, and the second pole piece and the plurality of second inner pole tabs are integrally formed, which is beneficial to ensure the reliable structural and electrical connection between the pole piece and the inner pole tabs It is also beneficial to simplify the production process of the battery cell and reduce the cost of the battery cell and the battery.
  • the aligned first extension parts and the second extension parts together form a capacity expansion area of the cell.
  • the expansion area is located between a plurality of first inner tabs and a plurality of second inner tabs; or, the capacity expansion area includes a plurality of parts, and at least one part is located between the plurality of first inner tabs and the plurality of second inner tabs.
  • at least one portion is located on a side of the plurality of first inner tabs away from the plurality of second inner tabs, or at a side of the plurality of second inner tabs away from the plurality of first inner tabs.
  • multiple parts of the capacity expansion area are distributed around the inner tab of the cell, which can make full use of the space around the inner tab and minimize the loss of space at the top of the cell. Sufficient capacity supplementation is achieved at the non-pole arrangement, thereby reducing battery capacity loss while ensuring charging performance, making the battery capacity larger.
  • the first and second extensions can be bent to better match the shape of the pole pieces.
  • the number of the first extension parts is multiple, and the plurality of first extension parts are connected to different positions of the top edge of the first main body part.
  • the number of the second extension parts is multiple, and the plurality of second extension parts are connected to different positions of the top edge of the second main body part.
  • the first extension part and the second extension part may be arranged in pairs to form a part of the expansion area. Among them, multiple parts of the expansion area can be set in alignment. In some other implementation manners, some parts of the expansion area may be set in alignment, and some parts may be set in a staggered manner. In some other implementation manners, the number of the first extending portion may also be one, and the number of the second extending portion may also be one, which is not strictly limited in this application.
  • one of the first pole piece and the second pole piece can be used as a positive electrode piece, and the other can be used as a negative electrode piece, and the negative electrode piece covers the positive electrode piece to ensure the performance of the battery.
  • the gap between the first extension portion and the plurality of first inner tabs is used to ensure a safe distance between the first extension portion and the first inner tabs, and the width of the gap is related to the manufacturing tolerance of the battery, for example Yes, the width of the gap may be greater than or equal to 0.1 mm, for example, about 2 mm, which is not strictly limited in this application.
  • the gap between the second extension portion and the plurality of second inner tabs is used to ensure a safe distance between the second extension portion and the second inner tabs
  • the width of the gap is related to the manufacturing tolerance of the battery, for example , the width of the gap may be greater than or equal to 0.1 mm, for example, about 2 mm, which is not strictly limited in this application.
  • the battery cell further includes a protective film, a first outer tab, and a second outer tab.
  • the ends of the plurality of first inner tabs are stacked in contact with each other, and the first outer tabs are welded together.
  • the ends of the plurality of second inner tabs are stacked in contact with each other, and the second outer tabs are welded together.
  • the protective film wraps the first pole piece, the second pole piece, one end of the first outer pole ear and one end of the second outer pole ear, and the other end of the first outer pole ear and the other end of the second outer pole ear are located on the protective film. outside.
  • the stacked portions of the plurality of first inner tabs and the first outer tabs can be simply bent.
  • the outer tabs by stacking the ends of a plurality of second inner tabs in contact with each other and then welding them with the second outer tabs, the stacked portions of the plurality of second inner tabs and the second outer pole can be simply bent.
  • the ear can reduce the occupation of the top space of the battery cell and reduce the loss of the top space of the battery cell, thereby reducing the loss of battery capacity while ensuring the charging performance.
  • the battery core is mainly in the shape of a rectangular plate, and the top surface of the battery core can provide a relatively flat matching installation environment.
  • the first main body part further includes a bottom edge, and the top edge and the bottom edge of the first main body part are arranged in parallel.
  • the second main body part further includes a bottom edge, and the top edge and the bottom edge of the second main body part are arranged in parallel.
  • the top edge of the first main body portion may be a straight edge.
  • both the first main body part and the first extension part include a current collector and a slurry coated on the surface of the current collector, the current collector of the first main body part, the current collector of the first extension part, and a plurality of The first inner tab is integrally formed, and the slurry of the first main body portion and the slurry of the first extension portion are integrally formed.
  • the preparation process of the first pole piece and the plurality of first inner tabs may include: coating the slurry on the first region of the elongated first current collector, and not coating the slurry on the second region of the first current collector material; removing part of the material of the second region of the first current collector to form a first pole piece and a plurality of first inner tabs.
  • the first current collector can be made of foil.
  • the first region of the first current collector covers the first body portion and the first extension portion, and the second region covers the plurality of first inner tabs.
  • the partial coating of the slurry on the first current collector can be realized by spraying with a special-shaped mold.
  • a blank area is reserved on the first current collector, that is, the second area, which can be used as the position of a plurality of first inner tabs, and then the second area is removed by laser cutting or die punching. Part of the material of the region is formed to form a plurality of first inner tabs, thereby obtaining multi-pole tabs.
  • both the second main body part and the second extension part include a current collector and a slurry coated on the surface of the current collector, the current collector of the second main body part, the current collector of the second extension part, and a plurality of The second inner tab is integrally formed, and the slurry of the second main body portion and the slurry of the second extension portion are integrally formed.
  • the preparation process of the second pole piece and the plurality of second inner tabs may include: coating the slurry in the third region of the elongated second current collector, and not coating the slurry in the fourth region of the second current collector material; removing part of the material of the fourth region of the second current collector to form a second pole piece and a plurality of second inner pole tabs.
  • the second current collector can be made of foil.
  • the third region of the second current collector covers the second body portion and the second extension portion, and the fourth region covers the plurality of second inner tabs.
  • the local coating of the slurry on the second current collector can be realized by spraying with a special-shaped mold.
  • a blank area is reserved on the second current collector, that is, the fourth area, which can be used as the position of a plurality of second inner tabs, and then the second current collector is removed by laser cutting or die punching. Part of the material of the region is formed to form a plurality of second inner tabs, thereby obtaining multi-pole tabs.
  • the present application further provides another battery cell, which can be used in a battery.
  • the battery core includes a plurality of first pole pieces, a plurality of second pole pieces, a plurality of first inner tabs, and a plurality of second inner tabs.
  • the first pole piece includes a first main body part and a first extension part, the first extension part and the first inner pole lug are connected to the top edge of the first main body part and are spaced apart from each other, the first main body part, the first extension part and the first The inner tabs are integrally formed.
  • the second pole piece includes a second body portion and a second extension portion, the second extension portion and the second inner tab are both connected to the top edge of the second body portion and spaced apart from each other, the second body portion, the second extension portion and the second The inner tabs are integrally formed.
  • a plurality of first pole pieces and a plurality of second pole pieces are alternately stacked and arranged and spaced from each other, a plurality of first inner tabs are arranged in alignment, a plurality of second inner tabs are arranged in alignment, the first extension portion and the second extension portion Alignment settings.
  • the battery improves the internal resistance of the battery through the multi-pole ear technology, and improves the charging performance of the battery.
  • a first extension part is arranged around the first inner tab
  • a second extension part is arranged around the second inner tab
  • the second extension part is aligned with the first extension part
  • the first extension part and the second extension part are aligned.
  • the extension parts together form a capacity expansion area of the battery cell.
  • the battery can use the expansion area around the inner tab, which can reduce the loss of the top space of the cell, and realize the capacity supplement at the non-tab arrangement of the cell, so as to ensure the charging performance and reduce the loss of battery capacity, making the The capacity of the battery is larger.
  • the aligned first extension parts and the second extension parts together form a capacity expansion area of the cell.
  • the expansion area is located between a plurality of first inner tabs and a plurality of second inner tabs; or, the capacity expansion area includes a plurality of parts, and at least one part is located between the plurality of first inner tabs and the plurality of second inner tabs.
  • at least one portion is located on a side of the plurality of first inner tabs away from the plurality of second inner tabs, or at a side of the plurality of second inner tabs away from the plurality of first inner tabs.
  • multiple parts of the capacity expansion area are distributed around the inner tab of the cell, which can make full use of the space around the inner tab and minimize the loss of space at the top of the cell. Sufficient capacity supplementation is achieved at the non-pole arrangement, thereby reducing battery capacity loss while ensuring charging performance, making the battery capacity larger.
  • the gap between the first extension portion and the plurality of first inner tabs is used to ensure a safe distance between the first extension portion and the first inner tabs, and the width of the gap is related to the manufacturing tolerance of the battery, for example Yes, the width of the gap may be greater than or equal to 0.1 mm, for example, about 2 mm, which is not strictly limited in this application.
  • the gap between the second extension portion and the plurality of second inner tabs is used to ensure a safe distance between the second extension portion and the second inner tabs
  • the width of the gap is related to the manufacturing tolerance of the battery, for example , the width of the gap may be greater than or equal to 0.1 mm, for example, about 2 mm, which is not strictly limited in this application.
  • the battery cell further includes a protective film, a first outer tab, and a second outer tab.
  • the ends of the plurality of first inner tabs are stacked in contact with each other, and the first outer tabs are welded together.
  • the ends of the plurality of second inner tabs are stacked in contact with each other, and the second outer tabs are welded together.
  • the protective film wraps a plurality of first pole pieces, a plurality of second pole pieces, one end of the first outer pole ear and one end of the second outer pole ear, the other end of the first outer pole ear and the other end of the second outer pole ear on the outside of the protective film.
  • the stacked portions of the plurality of first inner tabs and the first outer tabs can be simply bent.
  • the outer tabs by stacking the ends of a plurality of second inner tabs in contact with each other and then welding them with the second outer tabs, the stacked portions of the plurality of second inner tabs and the second outer pole can be simply bent.
  • the ear can reduce the occupation of the top space of the battery cell and reduce the loss of the top space of the battery cell, thereby reducing the loss of battery capacity while ensuring the charging performance.
  • the battery core is mainly in the shape of a rectangular plate, and the top surface of the battery core can provide a relatively flat matching installation environment.
  • the first main body part further includes a bottom edge, and the top edge and the bottom edge of the first main body part are arranged in parallel.
  • the second main body part further includes a bottom edge, and the top edge and the bottom edge of the second main body part are arranged in parallel.
  • the top edge of the first main body portion may be a straight edge.
  • the second main body part further includes a bottom edge, and the top edge and the bottom edge of the second main body part are arranged in parallel.
  • the second main body part further includes a bottom edge, and the top edge and the bottom edge of the second main body part are arranged in parallel.
  • the top edge of the second main body portion may be a straight edge.
  • both the first main body part and the first extension part include a current collector and a slurry coated on the surface of the current collector, the current collector of the first main body part, the current collector of the first extension part, and the first The inner tab is integrally formed, and the slurry of the first main body portion and the slurry of the first extension portion are integrally formed.
  • the present application further provides a battery, including any one of the above-mentioned battery cells.
  • the battery uses the expansion area around the inner tab, which can reduce the loss of the head space of the cell, and realize the capacity supplement at the non-tab arrangement of the cell, so as to ensure the charging performance and reduce the loss of battery capacity, making the battery larger capacity.
  • the battery further includes a flexible-rigid combination board, and the flexible-rigid combination board is fixed on the top of the cell and is electrically connected to the cell.
  • the flex-rigid board includes a hard board part, a first soft board part and a second soft board part, and the first soft board part and the second soft board part are respectively connected to two ends of the hard board part.
  • the battery also includes a bracket, and the bracket and the rigid-flex board are stacked and arranged in the thickness direction of the battery.
  • the rigid-flex board can be fixed to the bracket. Both the bracket and the rigid-flex board are located on the top of the battery cell, and the bracket and the battery core are arranged in the length direction of the battery.
  • the bracket can be fixedly connected to the electric core through the adhesive member.
  • the core is electrically connected to the hard board portion of the flex-rigid board.
  • the battery cell is connected to the external device through the first flexible board part and the second flexible board part of the flexible-rigid board, so that the battery can supply power to the external device.
  • the flex-rigid board may also include a hard board part and a flex board part.
  • the battery is roughly in the shape of a rectangular plate, so that the battery has lower requirements on the installation environment, which is beneficial to be assembled with other components.
  • the top surface of the battery may be a relatively flat plane.
  • the electrical connector of the battery can be secured and electrically connected to the circuit board.
  • the present application further provides an electronic device, comprising a casing and the above-mentioned battery, wherein the battery is installed in the casing. Batteries are used to power electronic devices.
  • the electronic device may be, but is not limited to, a mobile phone, a tablet, a wearable device, a notebook computer, and the like.
  • FIG. 1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.
  • Fig. 2 is the structural schematic diagram of the battery of the electronic device shown in Fig. 1;
  • FIG. 3 is a schematic structural diagram of the battery shown in FIG. 2 in another state of use;
  • FIG. 4 is a schematic structural diagram of a cell of the battery shown in FIG. 3 in some embodiments.
  • Fig. 5 is a schematic diagram of the assembly process of the cell shown in Fig. 4;
  • FIG. 6 is a schematic structural diagram of the main body of the battery cell shown in FIG. 4;
  • FIG. 7 is a top view of the main body of the battery cell shown in FIG. 6;
  • Figure 8 is a schematic cross-sectional view of the structure shown in Figure 4 taken along A-A;
  • FIG. 9 is a schematic structural diagram of the cells of the battery shown in FIG. 3 in other embodiments.
  • Figure 10 is a schematic diagram of the assembly process of the cell shown in Figure 9;
  • FIG. 11 is a schematic structural diagram of the main body of the battery cell shown in FIG. 10;
  • FIG. 12 is a schematic diagram of the internal structure of the cell body of the cell shown in FIG. 4 in other embodiments.
  • connection may It is a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium.
  • FIG. 1 is a schematic structural diagram of an electronic device 100 provided by an embodiment of the present application.
  • the present application provides an electronic device 100 , which includes a housing 10 , a battery 20 and a circuit board 30 , the battery 20 and the circuit board 30 are installed in the housing 10 , the battery 20 is electrically connected to the circuit board 30 , and the battery 20 is used for the electronic device 100 powered by.
  • the electronic device 100 may be, but is not limited to, a mobile phone, a tablet, a wearable device, a notebook computer, etc.
  • the embodiments of the present application take a mobile phone as an example for description.
  • the electronic device 100 may further include a display screen 40, the display screen 40 is installed on the casing 10, and the display screen 40 is used for displaying pictures and realizing interaction.
  • the electronic device 100 may further include more other components, which are not limited in this embodiment of the present application.
  • FIG. 2 is a schematic structural diagram of the battery 20 of the electronic device 100 shown in FIG. 1
  • FIG. 3 is a structural schematic diagram of the battery 20 shown in FIG. 2 in another use state.
  • the battery 20 includes a battery cell 1 , a rigid-flex board 2 , a bracket 3 and an adhesive member 4 .
  • the battery 20 has a length direction X, a width direction Y and a thickness direction Z.
  • the flex-rigid board 2 includes a hard board part 21 , a first soft board part 22 and a second soft board part 23 , and the first soft board part 22 and the second soft board part 23 are respectively connected to two parts of the hard board part 21 . end.
  • the rigid board portion 21 is not easily deformed, and may be a rigid wiring board.
  • the first flexible board portion 22 and the second flexible board portion 23 are easily deformed and may be flexible circuit boards.
  • the rigid-flex board 2 can be an integrally formed structural member, or an integrated structure can be formed by assembling a rigid circuit board and a flexible circuit board.
  • the first soft board part 22 and the second soft board part 23 can be flattened relative to the hard board part 21 , or bent to be folded or the like.
  • the flexible-rigid board 2 further includes a first electrical connector 24 and a second electrical connector 25.
  • the first electrical connector 24 is fixed to the end of the first flexible board portion 22, and the second electrical connector 25 is fixed to the first electrical connector 24.
  • the first electrical connector 24 and the second electrical connector 25 may be a BTB (board to board, board to board) connector or a gold finger structure or the like.
  • the rigid-flex board 2 is generally placed along the width direction Y of the battery 20 .
  • the bracket 3 and the rigid-flex board 2 are stacked and arranged in the thickness direction Z of the battery 20 .
  • the rigid-flex board 2 can be fixed to the bracket 3 .
  • Both the bracket 3 and the flexible-rigid combination board 2 are located on the top of the battery cell 1 , and the bracket 3 and the battery core 1 are arranged in the length direction X of the battery 20 .
  • the bracket 3 can be fixedly connected to the battery core 1 through the adhesive member 4 .
  • the battery core 1 includes a first outer tab 11 and a second outer tab 12 , the first outer tab 11 is fixedly connected and electrically connected to the hard plate portion 21 of the rigid-flex board 2 , and the second outer tab 12 is fixedly connected and electrically connected.
  • the hard board portion 21 of the flexible-rigid combination board 2 is connected, and the battery cell 1 is electrically connected to the flexible-rigid combination board 2 .
  • the battery cell 1 is connected to the external device through the first soft board part 22 and the second soft board part 23 of the flex-rigid board 2, so that the battery 20 can be connected to the circuit of the electronic device, so as to supply power to the electronic device through the battery, or The battery is charged through the electronic device's charging circuit.
  • the flex-rigid board 2 may also include a hard board part 21 and a soft board part, and the battery 20 is connected to the circuit of the electronic device through the soft board part.
  • the battery 20 is roughly in the shape of a rectangular plate, so that the battery 20 has lower requirements on the installation environment, which is beneficial to Assemble with other components. 1 and 2, the top surface 201 of the battery 20 close to the circuit board 30 can be a relatively flat plane, and the first electrical connector 24 and the second electrical connector 25 of the battery 20 can be fixed and electrically connected to the circuit board. 30.
  • FIG. 4 is a schematic structural diagram of the cell 1 of the battery 20 shown in FIG. 3 in some embodiments.
  • the cell 1 includes the above-mentioned first outer tab 11 and the second outer tab 12 , and further includes a cell body 13 and a protective film 14 .
  • the cell body 13 includes a plurality of first inner tabs 131 and a plurality of second inner tabs 132 .
  • the first outer tab 11 is welded with a plurality of first inner tabs 131
  • the second outer tab 12 is welded with a plurality of second tabs.
  • Inner tab 132 The protective film 14 wraps the cell body 13 , part of the first outer tab 11 and part of the second outer tab 12 , and the first outer tab 11 and the second outer tab 12 are partially exposed outside the protective film 14 .
  • the cell 1 is mainly in the shape of a rectangular plate, and the top surface 15 of the cell 1 can provide a relatively flat installation environment.
  • FIG. 5 is a schematic diagram of the assembly process of the battery cell 1 shown in FIG. 4
  • FIG. 6 is a schematic structural diagram of the battery cell main body 13 shown in FIG. 4
  • FIG. 7 is the battery cell main body 13 shown in FIG. 6 . top view.
  • the partial structure of the battery core 1 is filled with cross-section lines in the drawings.
  • the cell main body 13 of the battery cell 1 includes the above-mentioned plurality of first inner tabs 131 and a plurality of second inner tabs 132 , and the cell main body 13 further includes a first pole piece 133 and a second pole piece 134 . and diaphragm 135. 5 shows a schematic structural diagram of the first pole piece 133 and the second pole piece 134 when they are unfolded and a structural schematic diagram after winding.
  • one of the first pole piece 133 and the second pole piece 134 can be used as a positive electrode piece, and the other can be used as a negative electrode piece, and the negative electrode piece covers the positive electrode piece to ensure the performance of the battery 20 .
  • the embodiments of the present application are described by taking "the first pole piece 133 is a positive pole piece, and the second pole piece 134 is a negative pole piece" as an example.
  • the first pole piece 133 includes a first body portion 133a and a first extension portion 133b, and the first extension portion 133b and the plurality of first inner tabs 131 are connected to the top edge 133c of the first body portion 133a and are spaced apart from each other.
  • the top edge 133c of the first body portion 133a may be a straight edge.
  • the first main body portion 133a further includes a bottom edge 133d, and the top edge 133c of the first main body portion 133a may be disposed parallel to the bottom edge 133d.
  • the number of the first extension parts 133b may be multiple, and the plurality of first extension parts 133b are connected to different positions of the top edge 133c of the first main body part 133a.
  • the first main body portion 133a, the first extension portion 133b and the plurality of first inner tabs 131 are integrally formed.
  • Both the first main body part 133a and the first extension part 133b may include a current collector and a slurry coated on the surface of the current collector, the current collector of the first main body part 133a, the current collector of the first extension part 133b and a plurality of first
  • the inner tab 131 is integrally formed, and the slurry of the first main body portion 133a and the slurry of the first extension portion 133b are integrally formed.
  • the preparation process of the first pole piece 133 and the plurality of first inner pole tabs 131 may include: coating slurry (ie, active material) in the first region of the elongated first current collector, the first current collector The second region of the first current collector is not coated with slurry; part of the material of the second region of the first current collector is removed to form the first pole piece 133 and the plurality of first inner tabs 131 .
  • slurry ie, active material
  • the first current collector can be made of foil.
  • the first region of the first current collector covers the first main body portion 133 a and the first extension portion 133 b
  • the second region covers the plurality of first inner tabs 131 .
  • the partial coating of the slurry on the first current collector can be realized by spraying with a special-shaped mold.
  • a blank area is reserved on the first current collector, that is, the second area, which can be used as the position of a plurality of first inner tabs 131, and then the first current collector is removed by laser cutting or die punching. Part of the material of the second region is used to form a plurality of first inner tabs 131 , thereby obtaining a multi-pole tab.
  • the second pole piece 134 includes a second body portion 134a and a second extension portion 134b.
  • the second extension portion 134b and the plurality of second inner pole tabs 132 are both connected to the top edge 134c of the second body portion 134a and spaced apart from each other.
  • the top edge 134c of the second body portion 134a may be a straight edge.
  • the second main body portion 134a further includes a bottom edge 134e, and the top edge 134c of the second main body portion 134a may be disposed parallel to the bottom edge 134e.
  • the number of the second extension parts 134b may be multiple, and the plurality of second extension parts 134b are connected to different positions of the top edge 134c of the second main body part 134a.
  • the second main body portion 134a, the second extension portion 134b and the plurality of second inner tabs 132 are integrally formed.
  • Both the second body part 134a and the second extension part 134b may include a current collector and a slurry coated on the surface of the current collector, the current collector of the second body part 134a, the current collector of the second extension part 134b and a plurality of second
  • the inner tab 132 is integrally formed, and the slurry of the second main body portion 134a and the slurry of the second extension portion 134b are integrally formed.
  • the preparation process of the second pole piece 134 and the plurality of second inner pole tabs 132 may include: coating slurry (ie, active material) in the third region of the elongated second current collector, and the second current collector The fourth region of the second current collector is not coated with slurry; part of the material of the fourth region of the second current collector is removed to form the second pole piece 134 and a plurality of second inner tabs 132 .
  • slurry ie, active material
  • the second current collector can be made of foil.
  • the third region of the second current collector covers the second body portion 134a and the second extension portion 134b
  • the fourth region covers the plurality of second inner tabs 132 .
  • the local coating of the slurry on the second current collector can be realized by spraying with a special-shaped mold.
  • a blank area is reserved on the second current collector, that is, the fourth area, which can be used as the position of a plurality of second inner tabs 132, and then the second current collector is removed by laser cutting or die punching. Part of the material of the second region is used to form a plurality of second inner tabs 132, thereby obtaining a multi-pole tab.
  • the first pole piece 133 and the second pole piece 134 are stacked in a co-rolled arrangement and spaced apart from each other.
  • the diaphragm 135 is located between the first pole piece 133 and the second pole piece 134, and is wound together with the first pole piece 133 and the second pole piece 134, and the diaphragm 135 is used to isolate the first pole piece 133 and the second pole piece Sheet 134.
  • the plurality of first inner tabs 131 are arranged in alignment
  • the plurality of second inner tabs 132 are arranged in alignment.
  • the first extension portion 133b is aligned with the second extension portion 134b.
  • the first extending portion 133b and the plurality of second inner tabs 132 are arranged in a staggered manner, and the second extending portion 134b and the plurality of first inner tabs 131 are arranged in a staggered manner.
  • the plurality of first inner tabs 131 are connected to the first outer tabs 11
  • the plurality of second inner tabs 132 are connected to the second outer tabs 12 .
  • the battery 20 improves the internal resistance of the battery 20 through the multi-pole technology, and improves the charging performance of the battery 20 .
  • a first extension portion 133b is arranged around the first inner tab 131
  • a second extension 134b is arranged around the second inner tab 132.
  • the second extension portion 134b is aligned with the first extension portion 133b.
  • the aligned first extension parts 133 b and the second extension parts 134 b together form the capacity expansion area 136 of the battery cell 1 .
  • the battery 20 can reduce the loss of the head space of the battery cell 1 by setting the capacity expansion area 136 around the inner tab, and realize the capacity supplement at the non-tab arrangement of the battery cell 1, so as to ensure the charging performance while reducing the battery capacity. 20 capacity loss, so that the capacity of the battery 20 is larger.
  • first pole piece 133 and the plurality of first inner pole tabs 131 are integrally formed
  • second pole piece 134 and the plurality of second inner pole tabs 132 are integrally formed, which is beneficial to ensure the structural connection between the pole piece and the inner pole tabs and electrical connection reliability, and is beneficial to simplify the manufacturing process of the battery cell 1 and reduce the cost of the battery cell 1 and the battery 20 .
  • the dimensions (eg, width, length, etc.) of the plurality of first inner tabs 131 may be the same or different. When part or all of the regions of the two first inner tabs 131 are in a facing state or an overlapping state, it can be considered that the two first inner tabs 131 are aligned. When the partial regions of the two first inner tabs 131 are in a facing state, the partial regions of one of the first inner tabs 131 are arranged staggered relative to the other first inner tab 131 . Likewise, the dimensions (eg, width, length, etc.) of the plurality of second inner tabs 132 may be the same or different.
  • the two second inner tabs 132 When part or all of the regions of the two second inner tabs 132 are in a facing state or an overlapping state, it can be considered that the two second inner tabs 132 are aligned. When the partial regions of the two second inner tabs 132 are in a facing state, the partial regions of one of the second inner tabs 132 are arranged staggered relative to the other second inner tab 132 .
  • the dimensions (eg, width, length, etc.) of the first extension portion 133b and the second extension portion 134b may be the same or different.
  • the size of the second extension part 134b when the first extension part 133b is not protected by an insulating coating, is larger than that of the first extension part 134b. size of the portion 133b.
  • the size of the second extension portion 134b may be greater than, equal to or smaller than the size of the first extension portion 133b.
  • first extending portion 133b and the second extending portion 134b are aligned.
  • the partial regions of the first extending portion 133b and the second extending portion 134b are in a facing state, the partial regions of one of the first extending portion 133b and the second extending portion 134b are arranged staggered relative to the other.
  • the expansion area 136 may be located between the plurality of first inner tabs 131 and the plurality of second inner tabs 132 .
  • the first extension portion 133b and the second extension portion 134b may be arranged in pairs to form a part of the expansion area 136 .
  • multiple portions of the expansion area 136 may be arranged in alignment.
  • the multiple parts of the expansion area 136 may be partially aligned and partially staggered.
  • the number of the first extending portion 133b may also be one, and the number of the second extending portion 134b may also be one, which is not strictly limited in this application.
  • the gap between the first extending portion 133b and the plurality of first inner tabs 131 is used to ensure a safe distance between the first extending portion 133b and the first inner tab 131 , and the width of the gap is the same as that of the battery 20 . It is related to the manufacturing tolerance, for example, the width of the gap may be greater than or equal to 0.1 mm, for example, about 2 mm, which is not strictly limited in this application.
  • the gap between the second extending portion 134b and the plurality of second inner tabs 132 is used to ensure a safe distance between the second extending portion 134b and the second inner tab 132 , and the width of the gap is the same as that of the battery 20 . It is related to the manufacturing tolerance, for example, the width of the gap may be greater than or equal to 0.1 mm, for example, about 2 mm, which is not strictly limited in this application.
  • FIG. 8 is a schematic cross-sectional view of the structure shown in FIG. 4 taken along the line A-A.
  • a partial structure diagram of the protective film 14 is shown in FIG. 8 .
  • the ends of the plurality of first inner tabs 131 are stacked in contact with each other, and the first outer tabs 11 are welded together.
  • the ends of the plurality of second inner tabs 132 are stacked in contact with each other, and the second outer tabs 12 are welded together.
  • the protective film 14 wraps the first pole piece 133 , the plurality of first inner pole tabs 131 , the diaphragm 135 , the second pole piece 134 , the plurality of second inner pole tabs 132 , one end of the first outer pole tab 11 and the second outer pole One end of the ear 12 , the other end of the first outer tab 11 and the other end of the second outer tab 12 are located outside the protective film 14 .
  • the stacking part and the second outer tab 12 reduce the occupation of the head space of the battery cell 1 and the loss of the head space of the battery cell 1 , thereby reducing the capacity loss of the battery 20 while ensuring the charging performance.
  • the lengths of the first extension portion 133 b and the first inner tab 131 may be similar or different.
  • the lengths of the second extension portion 134b and the second inner tab 132 may be similar or different.
  • the length of the expansion area 136 is the same as or similar to the length of the first inner tab 131 after bending and the length of the second inner tab 132 after bending.
  • the length of the expansion area 136 corresponds to the length of the first extension portion 133b and the second extension portion 134b.
  • the length of the bent first inner tab 131 is smaller than the length of the flattened first inner tab 131.
  • the length of the second inner tab 132 is smaller than the length of the flattened second inner tab 132, so in the embodiment, the length of the flattened first inner tab 131 is greater than the length of the first extension 133b, the flattened The length of the second inner tab 132 is greater than the length of the second extension portion 134b. It can be understood that, in some other embodiments, the assembly and fixing structures of the plurality of first inner tabs 131 and the first outer tabs 11 may also be different from those in the present application, and the plurality of second inner tabs 132 and the second outer tabs The assembling and fixing structure of the tab 12 may also be different from that of the present application.
  • the length relationship between the first inner tab 131 and the first extension portion 133b may be different from the above embodiment, and the second inner tab 132 and the second extension portion 134b The length relationship of can be different from the above embodiment.
  • the embodiments of the present application do not strictly limit the specific dimensions (including length and width) of the first extending portion 133b, the first inner tab 131, the second extending portion 134b, and the second inner tab 132.
  • FIG. 9 is a schematic structural diagram of the cell 1 of the battery 20 shown in FIG. 3 in other embodiments.
  • FIG. 10 is a schematic diagram of the assembly process of the cell 1 shown in FIG. 9 .
  • FIG. 10 is a schematic structural diagram of the cell body 13 .
  • the battery cell 1 shown in this embodiment includes most of the features of the aforementioned battery cell 1 . The following mainly describes the difference between the two, and most of the same contents will not be repeated.
  • the first pole piece 133 includes a plurality of first extending portions 133b
  • the second pole piece 134 includes a plurality of second extending portions 134b
  • the second extending portions 134b are aligned with the first extending portions 133b.
  • the alignment of the second extension portion 134b with the first extension portion 133b includes the case where part of the area is aligned, and also includes the case where the entire area is aligned.
  • the aligned first extension parts 133 b and the second extension parts 134 b together form the capacity expansion area 136 of the battery cell 1 .
  • the expansion area 136 includes a plurality of parts (136a, 136b, 136c), at least one part 136a is located between a plurality of first inner tabs 131 and a plurality of second inner tabs 132; at least one part 136b is located in a plurality of first inner tabs
  • the tabs 131 are located at a side away from the plurality of second inner tabs 132 , or at least one portion 136 c is located at a side away from the plurality of first inner tabs 131 .
  • the multiple parts ( 136a , 136b , 136c ) of the capacity expansion area 136 are distributed around the inner tab of the battery cell 1 , so that the space around the inner tab can be fully utilized, and the battery cell can be reduced as much as possible. 1.
  • the loss of the head space can achieve sufficient capacity supplementation at the non-tab arrangement of the battery cell 1, thereby reducing the capacity loss of the battery 20 while ensuring the charging performance, so that the battery 20 has a larger capacity.
  • the first extension portion 133b and the second extension portion 134b may be bent to better match the shape of the pole piece.
  • FIG. 12 is a schematic diagram of the internal structure of the cell body 13 of the cell 1 shown in FIG. 4 in other embodiments.
  • the battery cell 1 shown in this embodiment includes most of the features of the aforementioned battery cell 1 . The following mainly describes the difference between the two, and most of the same contents will not be repeated. It can be understood that the battery cell main body 13 in this embodiment is also applied to the battery cell 1 shown in FIG. 9 .
  • the cell body 13 of the cell 1 includes a plurality of first pole pieces 133 , a plurality of second pole pieces 134 , a plurality of first inner tabs 131 and a plurality of second inner tabs 132 .
  • the first pole piece 133 includes a first main body portion 133a and a first extension portion 133b.
  • the first extension portion 133b and the first inner pole tab 131 are both connected to the top edge 133c of the first main body portion 133a and spaced apart from each other.
  • the first main body portion 133a , the first extension portion 133b and the first inner tab 131 are integrally formed.
  • the second pole piece 134 includes a second body portion 134a and a second extension portion 134b.
  • Both the second extension portion 134b and the second inner pole tab 132 are connected to the top edge 134c of the second body portion 134a and spaced apart from each other.
  • the second body portion 134a , the second extending portion 134b and the second inner tab 132 are integrally formed.
  • a plurality of first pole pieces 133 and a plurality of second pole pieces 134 are alternately stacked and spaced from each other, a plurality of first inner tabs 131 are arranged in alignment, a plurality of second inner tabs 132 are arranged in alignment, and the first extension portion 133b Aligned with the second extending portion 134b.
  • the first extending portion 133b and the plurality of second inner tabs 132 are arranged in a staggered manner, and the second extending portion 134b and the plurality of first inner tabs 131 are arranged in a staggered manner.
  • the battery 20 improves the internal resistance of the battery 20 through the multi-pole technology, and improves the charging performance of the battery 20 .
  • a first extension portion 133b is arranged around the first inner tab 131
  • a second extension 134b is arranged around the second inner tab 132
  • the second extension 134b is aligned with the first extension 133b.
  • the first extension portion 133b and the second extension portion 134b together form the capacity expansion area 136 of the cell 1 .
  • the battery 20 uses the capacity expansion area 136 around the inner tab, which can reduce the loss of the head space of the battery cell 1, and realize the capacity supplement at the non-tab arrangement of the battery cell 1, so as to ensure the charging performance and reduce the number of battery cells. 20 capacity loss, so that the capacity of the battery 20 is larger.
  • the main difference between the battery cell 1 shown in this embodiment and the battery cell 1 shown in the previous embodiment lies in the pole piece structure and assembly method.
  • a plurality of first pole pieces 133 and a plurality of second pole pieces 134 are alternately stacked to form the battery cell 1 .
  • the pole piece structure of this embodiment can be adaptively adjusted on the basis of the pole piece structure of the previous embodiment, and most of the features can still be the same.
  • the expansion area 136 is located between the plurality of first inner tabs 131 and the plurality of second inner tabs 132 ; or, the expansion area 136 includes a plurality of parts, at least one part is located in the plurality of first inner tabs 131 Between the plurality of second inner tabs 132, at least one part is located on the side of the plurality of first inner tabs 131 away from the plurality of second inner tabs 132, or is located at the side of the plurality of second inner tabs 132 away from the plurality of second inner tabs 132. One side of the first inner tab 131 .
  • the battery cell 1 further includes a protective film, a first outer tab and a second outer tab; the ends of the plurality of first inner tabs 131 are stacked in contact with each other, and the first outer tabs are welded together; The ends of the second inner tabs 132 are stacked in contact with each other, and the second outer tabs are welded together.
  • the protective film wraps a plurality of first pole pieces 133, a plurality of second pole pieces 134, one end of the first outer pole ear and one end of the second outer pole ear, the other end of the first outer pole ear and the second outer pole ear. The other end is on the outside of the protective film.
  • the top edge 133c of the first main body portion 133a is disposed parallel to the bottom edge
  • the top edge 134c of the second main body portion 134a is disposed parallel to the bottom edge
  • both the first main body part 133a and the first extension part 133b include a current collector and a slurry coated on the surface of the current collector, the current collector of the first main body part 133a, the current collector of the first extension part 133b and the first extension part 133b.
  • An inner tab 131 is integrally formed, and the slurry of the first main body portion 133a and the slurry of the first extension portion 133b are integrally formed.

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Abstract

本申请公开了一种电芯、电池及电子设备。电芯包括第一极片、第二极片、多个第一内极耳以及多个第二内极耳，第一极片包括第一主体部和第一延展部，第一延展部和多个第一内极耳均连接第一主体部的顶边且彼此间隔，第二极片包括第二主体部和第二延展部，第二延展部和多个第二内极耳均连接第二主体部的顶边且彼此间隔，第一极片与第二极片堆叠地共同卷绕设置且彼此间隔，多个第一内极耳对齐设置，多个第二内极耳对齐设置，第一延展部与第二延展部对齐设置。对齐的第一延展部和第二延展部共同形成电芯的扩容区，在电芯的非极耳排布处实现容量补充，从而在保障电芯的充电性能的同时，减少电池容量损失，使得电池的容量较大。

Description

电芯、电池及电子设备
本申请要求于2021年02月08日提交中国专利局、申请号为202110171799.0、申请名称为“一种电池”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，本申请要求于2021年02月27日提交中国专利局、申请号为202110221531.3、申请名称为“电芯、电池及电子设备”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
本申请涉及电池技术领域，尤其涉及一种电芯、电池及电子设备。
背景技术
当前，手机快充技术的充电功率发展到100W以上时，由于电芯充电发热的瓶颈限制，业界普遍采用电芯内部多极耳技术，该技术在引入充电性能提升的同时，也造成了约3％的电池容量损失。
发明内容
本申请提供了一种能够在保障充电性能的同时，减少电池容量损失的电芯、电池及电子设备。
第一方面，本申请提供一种电芯，可以应用于电池中。电芯包括第一极片、第二极片、多个第一内极耳以及多个第二内极耳。第一极片包括第一主体部和第一延展部，第一延展部和多个第一内极耳均连接第一主体部的顶边且彼此间隔，第一主体部、第一延展部及多个第一内极耳一体成型。第二极片包括第二主体部和第二延展部，第二延展部和多个第二内极耳均连接第二主体部的顶边且彼此间隔，第二主体部、第二延展部及多个第二内极耳一体成型。
第一极片与第二极片堆叠地共同卷绕设置且彼此间隔，多个第一内极耳对齐设置，多个第二内极耳对齐设置，第一延展部与第二延展部对齐设置。其中，第一延展部与多个第二内极耳错开排布，第二延展部与多个第一内极耳错开排布。
在本实现方式中，电池通过多极耳技术改善电池内阻，提升电池充电性能。同时，在第一内极耳的周边设置第一延展部，在第二内极耳的周边设置第二延展部，第二延展部对齐第一延展部设置，对齐的第一延展部和第二延展部共同形成电芯的扩容区。换言之，电池利用在内极耳周边设置扩容区，能够降低电芯的顶部空间的损失，在电芯的非极耳排布处实现容量补充，从而在保障充电性能的同时，减少电池容量损失，使得电池的容量较大。
此外，第一极片和多个第一内极耳一体成型，第二极片和多个第二内极耳一体成型，有利于确保极片与内极耳之间的结构连接和电连接可靠性，且有利于简化电芯的制作工序，降低电芯和电池的成本。
一些可能的实现方式中，对齐的第一延展部和第二延展部共同形成电芯的扩容区。扩容区位于多个第一内极耳与多个第二内极耳之间；或者，扩容区包括多个部分，至少一个部分位于多个第一内极耳与多个第二内极耳之间，至少一个部分位于多个第一内极耳远离多个第二内极耳的一侧、或者位于多个第二内极耳远离多个第一内极耳的一侧。
在本实现方式中，扩容区的多个部分分散地排布在电芯的内极耳的周边，能够充分利用内极耳周边的空间，能够尽量降低电芯顶部空间的损失，在电芯的非极耳排布处实现充分的 容量补充，从而在保障充电性能的同时，减少电池容量损失，使得电池的容量较大。
其中，在扩容区的位于多个第一内极耳远离多个第二内极耳的一侧、或者位于多个第二内极耳远离多个第一内极耳的一侧的部分中，第一延展部和第二延展部可以弯折，以更好地匹配极片的形状。
一些可能的实现方式中，第一延展部的数量为多个，多个第一延展部连接于第一主体部的顶边的不同位置。其中，第二延展部的数量为多个，多个第二延展部连接于第二主体部的顶边的不同位置。第一延展部与第二延展部可以成对设置，形成扩容区的一部分。其中，扩容区的多个部分可以对齐设置。在其他一些实现方式中，扩容区的多个部分中，可以部分对齐设置，部分错开设置。在其他一些实现方式中，第一延展部的数量也可以为一个，第二延展部的数量也可以为一个，本申请对此不做严格限定。
其中，第一极片和第二极片中的一者可以作为正极片，另一者可以作为负极片，负极片覆盖正极片，以确保电池性能。
其中，第一延展部与多个第一内极耳之间的间隙用于确保第一延展部与第一内极耳之间具有安全距离，该间隙的宽度与电池的制造公差相关，示例性的，间隙的宽度可以大于或等于0.1mm，例如2mm左右，本申请对此不做严格限定。
其中，第二延展部与多个第二内极耳之间的间隙用于确保第二延展部与第二内极耳之间具有安全距离，该间隙的宽度与电池的制造公差相关，示例性，间隙的宽度可以大于或等于0.1mm，例如2mm左右，本申请对此不做严格限定。
一些可能的实现方式中，电芯还包括保护膜、第一外极耳及第二外极耳。多个第一内极耳的末端彼此接触地堆叠设置，且共同焊接第一外极耳。多个第二内极耳的末端彼此接触地堆叠设置，且共同焊接第二外极耳。保护膜包裹第一极片、第二极片、第一外极耳的一端以及第二外极耳的一端，第一外极耳的另一端和第二外极耳的另一端位于保护膜的外侧。
在本实现方式中，通过将多个第一内极耳的末端彼此接触地堆叠后再与第一外极耳焊接，从而可以简单地弯折多个第一内极耳的堆叠部分和第一外极耳，通过将多个第二内极耳的末端彼此接触地堆叠后再与第二外极耳焊接，从而可以简单地弯折多个第二内极耳的堆叠部分和第二外极耳，以减少对电芯的顶部空间的占用，减少电芯的顶部空间的损失，从而在保障充电性能的同时，减少电池容量损失。
其中，电芯主要呈矩形板状，电芯的顶面能够提供较为平整的配合安装环境。
一些可能的实现方式中，第一主体部还包括底边，第一主体部的顶边与底边平行设置。第二主体部还包括底边，第二主体部的顶边与底边平行设置。其中，第一主体部的顶边可以为直边。
一些可能的实现方式中，第一主体部和第一延展部均包括集流体和涂布于集流体的表面的浆料，第一主体部的集流体、第一延展部的集流体及多个第一内极耳一体成型，第一主体部的浆料和第一延展部的浆料一体成型。
其中，第一极片和多个第一内极耳的制备过程可以包括：在长条形的第一集流体的第一区域涂布浆料，第一集流体的第二区域不涂布浆料；去除第一集流体的第二区域的部分材料，以形成第一极片和多个第一内极耳。
其中，第一集流体可以采用箔材。第一集流体的第一区域覆盖第一主体部和第一延展部，第二区域覆盖多个第一内极耳。其中，可以通过配合异形模具喷涂的方式，实现浆料在第一集流体上的局部涂布。在涂布浆料时，第一集流体上预留出空白区域，也即第二区域，可以用作多个第一内极耳的位置，然后通过激光切割或刀模冲压等方式去除第二区域的部分材料， 以形成多个第一内极耳，从而得到多极耳极片。
一些可能的实现方式中，第二主体部和第二延展部均包括集流体和涂布于集流体的表面的浆料，第二主体部的集流体、第二延展部的集流体及多个第二内极耳一体成型，第二主体部的浆料和第二延展部的浆料一体成型。
其中，第二极片和多个第二内极耳的制备过程可以包括：在长条形的第二集流体的第三区域涂布浆料，第二集流体的第四区域不涂布浆料；去除第二集流体的第四区域的部分材料，以形成第二极片和多个第二内极耳。
其中，第二集流体可以采用箔材。第二集流体的第三区域覆盖第二主体部和第二延展部，第四区域覆盖多个第二内极耳。其中，可以通过配合异形模具喷涂的方式，实现浆料在第二集流体上的局部涂布。在涂布浆料时，第二集流体上预留出空白区域，也即第四区域，可以用作多个第二内极耳的位置，然后通过激光切割或刀模冲压等方式去除第二区域的部分材料，以形成多个第二内极耳，从而得到多极耳极片。
第二方面，本申请还提供另一种电芯，可以应用于电池中。电芯包括多个第一极片、多个第二极片、多个第一内极耳以及多个第二内极耳。第一极片包括第一主体部和第一延展部，第一延展部和第一内极耳均连接第一主体部的顶边且彼此间隔，第一主体部、第一延展部及第一内极耳一体成型。第二极片包括第二主体部和第二延展部，第二延展部和第二内极耳均连接第二主体部的顶边且彼此间隔，第二主体部、第二延展部及第二内极耳一体成型。
多个第一极片与多个第二极片交替地堆叠设置且彼此间隔，多个第一内极耳对齐设置，多个第二内极耳对齐设置，第一延展部与第二延展部对齐设置。
在本实现方式中，电池通过多极耳技术改善电池内阻，提升电池充电性能。同时，在第一内极耳的周边设置第一延展部，在第二内极耳的周边设置第二延展部，第二延展部对齐第一延展部设置，对齐的第一延展部和第二延展部共同形成电芯的扩容区。换言之，电池利用在内极耳周边设置扩容区，能够降低电芯顶部空间的损失，在电芯的非极耳排布处实现容量补充，从而在保障充电性能的同时，减少电池容量损失，使得电池的容量较大。
一些可能的实现方式中，对齐的第一延展部和第二延展部共同形成电芯的扩容区。扩容区位于多个第一内极耳与多个第二内极耳之间；或者，扩容区包括多个部分，至少一个部分位于多个第一内极耳与多个第二内极耳之间，至少一个部分位于多个第一内极耳远离多个第二内极耳的一侧、或者位于多个第二内极耳远离多个第一内极耳的一侧。
在本实现方式中，扩容区的多个部分分散地排布在电芯的内极耳的周边，能够充分利用内极耳周边的空间，能够尽量降低电芯顶部空间的损失，在电芯的非极耳排布处实现充分的容量补充，从而在保障充电性能的同时，减少电池容量损失，使得电池的容量较大。
其中，第一延展部与多个第一内极耳之间的间隙用于确保第一延展部与第一内极耳之间具有安全距离，该间隙的宽度与电池的制造公差相关，示例性的，间隙的宽度可以大于或等于0.1mm，例如2mm左右，本申请对此不做严格限定。
其中，第二延展部与多个第二内极耳之间的间隙用于确保第二延展部与第二内极耳之间具有安全距离，该间隙的宽度与电池的制造公差相关，示例性，间隙的宽度可以大于或等于0.1mm，例如2mm左右，本申请对此不做严格限定。
一些可能的实现方式中，电芯还包括保护膜、第一外极耳及第二外极耳。多个第一内极耳的末端彼此接触地堆叠设置，且共同焊接第一外极耳。多个第二内极耳的末端彼此接触地堆叠设置，且共同焊接第二外极耳。保护膜包裹多个第一极片、多个第二极片、第一外极耳的一端以及第二外极耳的一端，第一外极耳的另一端和第二外极耳的另一端位于保护膜的外 侧。
在本实现方式中，通过将多个第一内极耳的末端彼此接触地堆叠后再与第一外极耳焊接，从而可以简单地弯折多个第一内极耳的堆叠部分和第一外极耳，通过将多个第二内极耳的末端彼此接触地堆叠后再与第二外极耳焊接，从而可以简单地弯折多个第二内极耳的堆叠部分和第二外极耳，以减少对电芯的顶部空间的占用，减少电芯的顶部空间的损失，从而在保障充电性能的同时，减少电池容量损失。
其中，电芯主要呈矩形板状，电芯的顶面能够提供较为平整的配合安装环境。
一些可能的实现方式中，第一主体部还包括底边，第一主体部的顶边与底边平行设置。第二主体部还包括底边，第二主体部的顶边与底边平行设置。其中，第一主体部的顶边可以为直边。
一些可能的实现方式中，第二主体部还包括底边，第二主体部的顶边与底边平行设置。第二主体部还包括底边，第二主体部的顶边与底边平行设置。其中，第二主体部的顶边可以为直边。
一些可能的实现方式中，第一主体部和第一延展部均包括集流体和涂布于集流体的表面的浆料，第一主体部的集流体、第一延展部的集流体及第一内极耳一体成型，第一主体部的浆料和第一延展部的浆料一体成型。
第三方面，本申请还提供一种电池，包括上述任一项的电芯。电池利用在内极耳周边设置扩容区，能够降低电芯的顶部空间的损失，在电芯的非极耳排布处实现容量补充，从而在保障充电性能的同时，减少电池容量损失，使得电池的容量较大。
一些可能的实现方式中，电池还包括软硬结合板，软硬结合板固定于电芯的顶部，且电连接电芯。软硬结合板包括硬板部、第一软板部及第二软板部，第一软板部和第二软板部分别连接硬板部的两端。
电池还包括支架，支架与软硬结合板堆叠设置且排布于电池的厚度方向。软硬结合板可以固定于支架。支架和软硬结合板均位于电芯的顶部，支架与电芯排布于电池的长度方向。其中，支架可以通过粘接件固定连接电芯。芯与软硬结合板的硬板部电连接。其中，电芯通过软硬结合板的第一软板部和第二软板部连接至外部器件，使得电池能够为外部器件供电。
在其他一些实现方式中，软硬结合板也可以包括硬板部和一个软板部。
一些实现方式中，电池大致呈矩形板状，使得电池对安装环境的要求较低，有利于与其他部件组装。其中，电池的顶面可以为较为平整的平面。电池的电连接器可以固定且电连接电路板。
第四方面，本申请还提供一种电子设备，包括壳体和上述电池，电池安装于壳体内。电池用于为电子设备供电。其中，电子设备可以是但不限于是手机、平板、穿戴设备、笔记本电脑等。
附图说明
图1是本申请实施例提供的一种电子设备的结构示意图；
图2是图1所示电子设备的电池的结构示意图；
图3是图2所示电池在另一使用状态中的结构示意图；
图4是图3所示电池的电芯在一些实施例中的结构示意图；
图5是图4所示电芯的组装过程示意图；
图6是图4所示电芯主体的结构示意图；
图7是图6所示电芯主体的俯视图；
图8是图4所示结构沿A-A处剖开的截面示意图；
图9是图3所示电池的电芯在另一些实施例中的结构示意图；
图10是图9所示电芯的组装过程示意图；
图11是图10所示电芯主体的结构示意图；
图12是图4所示电芯的电芯主体在另一些实施例中的内部结构示意图。
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。其中，在本申请实施例的描述中，除非另有说明，“多个”是指两个或多于两个。术语“第一”、“第二”等用词仅用于描述目的，而不能理解为暗示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个该特征。
本申请实施例中所提到的方位用语，例如，“上”、“下”、“侧”、“顶”、“底”等，仅是参考附图的方向，因此，使用的方位用语是为了更好、更清楚地说明及理解本申请实施例，而不是指示或暗指所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请实施例的限制。
在本申请实施例的描述中，需要说明的是，除非另有明确的规定和限定，术语“连接”、“安装”、“设置在……上”应做广义理解，例如，“连接”可以是可拆卸地连接，也可以是不可拆卸地连接；可以是直接连接，也可以通过中间媒介间接连接。
请参阅图1，图1是本申请实施例提供的一种电子设备100的结构示意图。
本申请提供一种电子设备100，包括壳体10、电池20及电路板30，电池20和电路板30安装于壳体10内，电池20电连接电路板30，电池20用于为电子设备100供电。示例性的，电子设备100可以是但不限于是手机、平板、穿戴设备、笔记本电脑等，本申请实施例以手机为例进行描述。
其中，电子设备100还可以包括显示屏40，显示屏40安装于壳体10，显示屏40用于显示画面和实现交互。电子设备100还可以包括更多的其他的部件，本申请实施例对此不作限定。
请结合参阅图2和图3，图2是图1所示电子设备100的电池20的结构示意图，图3是图2所示电池20在另一使用状态中的结构示意图。
一些实施例中，电池20包括电芯1、软硬结合板2、支架3及粘接件4。电池20具有长度方向X、宽度方向Y及厚度方向Z，电池20的宽度方向Y垂直于电池20的长度方向X，电池20的厚度方向Z垂直于电池20的长度方向X和宽度方向Y。
示例性的，软硬结合板2包括硬板部21、第一软板部22及第二软板部23，第一软板部22和第二软板部23分别连接硬板部21的两端。硬板部21不容易发生形变，可以为硬质电路板。第一软板部22和第二软板部23容易发生形变，可以为柔性电路板。软硬结合板2可以为一体成型的结构件，也可以由硬质电路板与柔性电路板组装后形成一体式结构。第一软板部22和第二软板部23可以相对硬板部21展平，或者弯折至折叠等。其中，软硬结合板2还包括第一电连接器24和第二电连接器25，第一电连接器24固定于第一软板部22的端部，第二电连接器25固定于第二软板部23的端部。其中，第一电连接器24、第二电连接器25可以为BTB(board to board，板对板)连接器或金手指结构等。其中，软硬结合板2大致 沿电池20的宽度方向Y摆放。
支架3与软硬结合板2堆叠设置且排布于电池20的厚度方向Z。软硬结合板2可以固定于支架3。支架3和软硬结合板2均位于电芯1的顶部，支架3与电芯1排布于电池20的长度方向X。其中，支架3可以通过粘接件4固定连接电芯1。
电芯1包括第一外极耳11和第二外极耳12，第一外极耳11固定连接且电连接软硬结合板2的硬板部21，第二外极耳12固定连接且电连接软硬结合板2的硬板部21，电芯1与软硬结合板2电连接。其中，电芯1通过软硬结合板2的第一软板部22和第二软板部23连接至外部器件，使得电池20能够与电子设备的电路连接，实现通过电池为电子设备供电，或通过电子设备的充电电路为电池充电。在其他一些实施例中，软硬结合板2也可以包括硬板部21和一个软板部，电池20通过该软板部连接电子设备的电路。
示例性的，除了软硬结合板2的可以弯折的第一软板部22和第二软板部23，电池20大致呈矩形板状，使得电池20对安装环境的要求较低，有利于与其他部件组装。其中，结合参阅图1和图2，电池20靠近电路板30的顶面201可以为较为平整的平面，电池20的第一电连接器24和第二电连接器25可以固定且电连接电路板30。
请参阅图4，图4是图3所示电池20的电芯1在一些实施例中的结构示意图。
一些实施例中，电芯1包括上述第一外极耳11和第二外极耳12，还包括电芯主体13和保护膜14。电芯主体13包括多个第一内极耳131和多个第二内极耳132，第一外极耳11焊接多个第一内极耳131，第二外极耳12焊接多个第二内极耳132。保护膜14包裹电芯主体13、部分第一外极耳11和部分第二外极耳12，第一外极耳11和第二外极耳12部分露出在保护膜14外侧。
示例性的，除了外露的部分第一外极耳11和部分第二外极耳12，电芯1主要呈矩形板状，电芯1的顶面15能够提供较为平整的配合安装环境。
请结合参阅图5至图7，图5是图4所示电芯1的组装过程示意图，图6是图4所示电芯主体13的结构示意图，图7是图6所示电芯主体13的俯视图。其中，为了更清楚地示意出电芯1的结构，附图中对电芯1的部分结构进行剖面线填充示意。
一些实施例中，电芯1的电芯主体13包括上述多个第一内极耳131和多个第二内极耳132，电芯主体13还包括第一极片133、第二极片134以及隔膜135。其中，图5中示意出第一极片133和第二极片134展开时的结构示意图和卷绕后的结构示意图。示例性的，第一极片133和第二极片134中的一者可以作为正极片，另一者可以作为负极片，负极片覆盖正极片，以确保电池20性能。本申请实施例以“第一极片133为正极片，第二极片134为负极片”为例进行描述。
示例性的，第一极片133包括第一主体部133a和第一延展部133b，第一延展部133b和多个第一内极耳131均连接第一主体部133a的顶边133c且彼此间隔。示例性的，第一主体部133a的顶边133c可以为直边。其中，第一主体部133a还包括底边133d，第一主体部133a的顶边133c可以与底边133d平行设置。示例性的，第一延展部133b的数量可以为多个，多个第一延展部133b连接于第一主体部133a的顶边133c的不同位置。
第一主体部133a、第一延展部133b及多个第一内极耳131一体成型。第一主体部133a和第一延展部133b均可以包括集流体和涂布于集流体的表面的浆料，第一主体部133a的集流体、第一延展部133b的集流体及多个第一内极耳131一体成型，第一主体部133a的浆料和第一延展部133b的浆料一体成型。
其中，第一极片133和多个第一内极耳131的制备过程可以包括：在长条形的第一集流 体的第一区域涂布浆料(也即活性物质)，第一集流体的第二区域不涂布浆料；去除第一集流体的第二区域的部分材料，以形成第一极片133和多个第一内极耳131。
其中，第一集流体可以采用箔材。第一集流体的第一区域覆盖第一主体部133a和第一延展部133b，第二区域覆盖多个第一内极耳131。其中，可以通过配合异形模具喷涂的方式，实现浆料在第一集流体上的局部涂布。在涂布浆料时，第一集流体上预留出空白区域，也即第二区域，可以用作多个第一内极耳131的位置，然后通过激光切割或刀模冲压等方式去除第二区域的部分材料，以形成多个第一内极耳131，从而得到多极耳极片。
示例性的，第二极片134包括第二主体部134a和第二延展部134b，第二延展部134b和多个第二内极耳132均连接第二主体部134a的顶边134c且彼此间隔。示例性的，第二主体部134a的顶边134c可以为直边。其中，第二主体部134a还包括底边134e，第二主体部134a的顶边134c可以与底边134e平行设置。示例性的，第二延展部134b的数量可以为多个，多个第二延展部134b连接于第二主体部134a的顶边134c的不同位置。
第二主体部134a、第二延展部134b及多个第二内极耳132一体成型。第二主体部134a和第二延展部134b均可以包括集流体和涂布于集流体的表面的浆料，第二主体部134a的集流体、第二延展部134b的集流体及多个第二内极耳132一体成型，第二主体部134a的浆料和第二延展部134b的浆料一体成型。
其中，第二极片134和多个第二内极耳132的制备过程可以包括：在长条形的第二集流体的第三区域涂布浆料(也即活性物质)，第二集流体的第四区域不涂布浆料；去除第二集流体的第四区域的部分材料，以形成第二极片134和多个第二内极耳132。
其中，第二集流体可以采用箔材。第二集流体的第三区域覆盖第二主体部134a和第二延展部134b，第四区域覆盖多个第二内极耳132。其中，可以通过配合异形模具喷涂的方式，实现浆料在第二集流体上的局部涂布。在涂布浆料时，第二集流体上预留出空白区域，也即第四区域，可以用作多个第二内极耳132的位置，然后通过激光切割或刀模冲压等方式去除第二区域的部分材料，以形成多个第二内极耳132，从而得到多极耳极片。
示例性的，第一极片133与第二极片134堆叠地共同卷绕设置且彼此间隔。其中，隔膜135位于第一极片133与第二极片134之间，与第一极片133和第二极片134共同卷绕设置，隔膜135用于隔离第一极片133与第二极片134。第一极片133与第二极片134堆叠卷绕后，多个第一内极耳131对齐设置，多个第二内极耳132对齐设置。第一延展部133b与第二延展部134b对齐设置。第一延展部133b与多个第二内极耳132错开排布，第二延展部134b与多个第一内极耳131错开排布。多个第一内极耳131连接第一外极耳11，多个第二内极耳132连接第二外极耳12。
在本实施例中，电池20通过多极耳技术改善电池20内阻，提升电池20充电性能。同时，在第一内极耳131的周边设置第一延展部133b，在第二内极耳132的周边设置第二延展部134b，第一极片133与第二极片134堆叠卷绕后，第二延展部134b对齐第一延展部133b设置。对齐的第一延展部133b和第二延展部134b共同形成电芯1的扩容区136。换言之，电池20利用在内极耳周边设置扩容区136，能够降低电芯1顶部空间的损失，在电芯1的非极耳排布处实现容量补充，从而在保障充电性能的同时，减少电池20容量损失，使得电池20的容量较大。
此外，第一极片133和多个第一内极耳131一体成型，第二极片134和多个第二内极耳132一体成型，有利于确保极片与内极耳之间的结构连接和电连接可靠性，且有利于简化电芯1的制作工序，降低电芯1和电池20的成本。
可以理解的是，多个第一内极耳131的尺寸(例如宽度、长度等)可以是相同的，也可以是不同的。当两个第一内极耳131的部分区域或全部区域处于正对状态或重叠状态，则可以认为这两个第一内极耳131对齐设置。当两个第一内极耳131的部分区域处于正对状态时，其中一个第一内极耳131的部分区域相对另一个第一内极耳131错开排布。同样的，多个第二内极耳132的尺寸(例如宽度、长度等)可以是相同的，也可以是不同的。当两个第二内极耳132的部分区域或全部区域处于正对状态或重叠状态，则可以认为这两个第二内极耳132对齐设置。当两个第二内极耳132的部分区域处于正对状态时，其中一个第二内极耳132的部分区域相对另一个第二内极耳132错开排布。
第一延展部133b和第二延展部134b的尺寸(例如宽度、长度等)可以是相同的，也可以是不同的。例如，在第一极片133为正极片、第二极片134为负极片的实施例中，在第一延展部133b的无绝缘涂层保护时，第二延展部134b的尺寸大于第一延展部133b的尺寸。在第一延展部133b的无绝缘涂层保护时，第二延展部134b的尺寸则可以大于、等于或小于第一延展部133b的尺寸。当第一延展部133b与第二延展部134b的部分区域或全部区域处于正对状态或重叠状态，则可以认为第一延展部133b与第二延展部134b对齐设置。当第一延展部133b与第二延展部134b的部分区域处于正对状态时，第一延展部133b和第二延展部134b中的其中一者的部分区域相对另一者错开排布。
示例性的，扩容区136可以位于多个第一内极耳131与多个第二内极耳132之间。其中，第一延展部133b的数量为多个，第二延展部134b的数量为多个时，第一延展部133b与第二延展部134b可以成对设置，形成扩容区136的一部分。示例性的，扩容区136的多个部分可以对齐设置。在其他一些实施例中，扩容区136的多个部分中，可以部分对齐设置，部分错开设置。在其他一些实施例中，第一延展部133b的数量也可以为一个，第二延展部134b的数量也可以为一个，本申请对此不做严格限定。
示例性的，第一延展部133b与多个第一内极耳131之间的间隙用于确保第一延展部133b与第一内极耳131之间具有安全距离，该间隙的宽度与电池20的制造公差相关，示例性的，间隙的宽度可以大于或等于0.1mm，例如2mm左右，本申请对此不做严格限定。
示例性的，第二延展部134b与多个第二内极耳132之间的间隙用于确保第二延展部134b与第二内极耳132之间具有安全距离，该间隙的宽度与电池20的制造公差相关，示例性的，间隙的宽度可以大于或等于0.1mm，例如2mm左右，本申请对此不做严格限定。
请结合参阅图4和图8，图8是图4所示结构沿A-A处剖开的截面示意图。其中，图8中对保护膜14进行部分结构示意。一些实施例中，多个第一内极耳131的末端彼此接触地堆叠设置，且共同焊接第一外极耳11。同样的，多个第二内极耳132的末端彼此接触地堆叠设置，且共同焊接第二外极耳12。保护膜14包裹第一极片133、多个第一内极耳131、隔膜135、第二极片134、多个第二内极耳132、第一外极耳11的一端以及第二外极耳12的一端，第一外极耳11的另一端和第二外极耳12的另一端位于保护膜14的外侧。
在本实施例中，通过将多个第一内极耳131的末端彼此接触地堆叠后再与第一外极耳11焊接，从而可以简单地弯折多个第一内极耳131的堆叠部分和第一外极耳11，通过将多个第二内极耳132的末端彼此接触地堆叠后再与第二外极耳12焊接，从而可以简单地弯折多个第二内极耳132的堆叠部分和第二外极耳12，以减少对电芯1的顶部空间的占用，减少电芯1的顶部空间的损失，从而在保障充电性能的同时，减少电池20容量损失。
其中，结合参阅图4、图5以及图8，第一延展部133b与第一内极耳131的长度可以是相近的，也可以是不同的。第二延展部134b与第二内极耳132的长度可以是相近的，也可以 是不同的。示例性的，如图4所示，在电芯1中，扩容区136的长度与弯折后的第一内极耳131的长度及弯折后的第二内极耳132的长度相同或相近。而扩容区136的长度对应于第一延展部133b和第二延展部134b的长度，弯折后的第一内极耳131的长度小于展平的第一内极耳131的长度，弯折后的第二内极耳132的长度小于展平的第二内极耳132的长度，因此实施例中，展平的第一内极耳131的长度大于第一延展部133b的长度，展平的第二内极耳132的长度大于第二延展部134b的长度。可以理解的是，在其他一些实施例中，多个第一内极耳131与第一外极耳11的组装固定结构也可以与本申请不同，多个第二内极耳132与第二外极耳12的组装固定结构也可以与本申请不同，此时第一内极耳131与第一延展部133b的长度关系可以与上述实施例不同，第二内极耳132与第二延展部134b的长度关系可以与上述实施例不同。本申请实施例不对第一延展部133b、第一内极耳131、第二延展部134b及第二内极耳132的具体尺寸(包括长度、宽度)做严格限定。
请结合参阅图9至图11，图9是图3所示电池20的电芯1在另一些实施例中的结构示意图，图10是图9所示电芯1的组装过程示意图，图11是图10所示电芯主体13的结构示意图。本实施例所示电芯1包括前述电芯1的大部分特征，以下主要描述两者的区别，两者相同的大部分内容不再赘述。
一些实施例中，第一极片133包括多个第一延展部133b，第二极片134包括多个第二延展部134b，第二延展部134b与第一延展部133b对齐设置。第二延展部134b与第一延展部133b对齐设置包括部分区域对齐的情况，也包括全部区域对齐的情况。对齐的第一延展部133b和第二延展部134b共同形成电芯1的扩容区136。扩容区136包括多个部分(136a、136b、136c)，至少一个部分136a位于多个第一内极耳131与多个第二内极耳132之间；至少一个部分136b位于多个第一内极耳131远离多个第二内极耳132的一侧，或者，至少一个部分136c位于多个第二内极耳132远离多个第一内极耳131的一侧。
在本实施例中，扩容区136的多个部分(136a、136b、136c)分散地排布在电芯1的内极耳的周边，能够充分利用内极耳周边的空间，能够尽量降低电芯1顶部空间的损失，在电芯1的非极耳排布处实现充分的容量补充，从而在保障充电性能的同时，减少电池20容量损失，使得电池20的容量较大。
其中，在扩容区136的部分136b或部分136c中，第一延展部133b和第二延展部134b可以弯折，以更好地匹配极片的形状。
请参阅图12，图12是图4所示电芯1的电芯主体13在另一些实施例中的内部结构示意图。本实施例所示电芯1包括前述电芯1的大部分特征，以下主要描述两者的区别，两者相同的大部分内容不再赘述。可以理解的是，本实施例电芯主体13也应用于图9所示电芯1。
一些实施例中，电芯1的电芯主体13包括多个第一极片133、多个第二极片134、多个第一内极耳131以及多个第二内极耳132。第一极片133包括第一主体部133a和第一延展部133b，第一延展部133b和第一内极耳131均连接第一主体部133a的顶边133c且彼此间隔，第一主体部133a、第一延展部133b及第一内极耳131一体成型。第二极片134包括第二主体部134a和第二延展部134b，第二延展部134b和第二内极耳132均连接第二主体部134a的顶边134c且彼此间隔，第二主体部134a、第二延展部134b及第二内极耳132一体成型。
多个第一极片133与多个第二极片134交替地堆叠设置且彼此间隔，多个第一内极耳131对齐设置，多个第二内极耳132对齐设置，第一延展部133b与第二延展部134b对齐设置。第一延展部133b与多个第二内极耳132错开排布，第二延展部134b与多个第一内极耳131错开排布。
在本实施例中，电池20通过多极耳技术改善电池20内阻，提升电池20充电性能。同时，在第一内极耳131的周边设置第一延展部133b，在第二内极耳132的周边设置第二延展部134b，第二延展部134b对齐第一延展部133b设置，对齐的第一延展部133b和第二延展部134b共同形成电芯1的扩容区136。换言之，电池20利用在内极耳周边设置扩容区136，能够降低电芯1顶部空间的损失，在电芯1的非极耳排布处实现容量补充，从而在保障充电性能的同时，减少电池20容量损失，使得电池20的容量较大。
本实施例所示电芯1与前文实施例所示电芯1的主要区别在于极片结构和组装方式，前文实施采用第一极片133和第二极片134共同卷绕形成电芯1，本实施例采用多个第一极片133和多个第二极片134交替堆叠形成电芯1。基于此，本实施例的极片结构可以在前文实施例的极片结构的基础上做适应性调整，而大部分特征仍可以相同。
示例性的，扩容区136位于多个第一内极耳131与多个第二内极耳132之间；或者，扩容区136包括多个部分，至少一个部分位于多个第一内极耳131与多个第二内极耳132之间，至少一个部分位于多个第一内极耳131远离多个第二内极耳132的一侧、或者位于多个第二内极耳132远离多个第一内极耳131的一侧。
示例性的，电芯1还包括保护膜、第一外极耳及第二外极耳；多个第一内极耳131的末端彼此接触地堆叠设置，且共同焊接第一外极耳；多个第二内极耳132的末端彼此接触地堆叠设置，且共同焊接第二外极耳。保护膜包裹多个第一极片133、多个第二极片134、第一外极耳的一端以及第二外极耳的一端，第一外极耳的另一端和第二外极耳的另一端位于保护膜的外侧。
示例性的，第一主体部133a的顶边133c与底边平行设置，第二主体部134a的顶边134c与底边平行设置。
示例性的，第一主体部133a和第一延展部133b均包括集流体和涂布于集流体的表面的浆料，第一主体部133a的集流体、第一延展部133b的集流体及第一内极耳131一体成型，第一主体部133a的浆料和第一延展部133b的浆料一体成型。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的范围。

Claims (14)

  1. 一种电芯，其特征在于，包括第一极片、第二极片、多个第一内极耳以及多个第二内极耳；
    所述第一极片包括第一主体部和第一延展部，所述第一延展部和多个所述第一内极耳均连接所述第一主体部的顶边且彼此间隔，所述第一主体部、所述第一延展部及多个所述第一内极耳一体成型；
    所述第二极片包括第二主体部和第二延展部，所述第二延展部和多个所述第二内极耳均连接所述第二主体部的顶边且彼此间隔，所述第二主体部、所述第二延展部及多个所述第二内极耳一体成型；
    所述第一极片与所述第二极片堆叠地共同卷绕设置且彼此间隔，多个所述第一内极耳对齐设置，多个所述第二内极耳对齐设置，所述第一延展部与所述第二延展部对齐设置。
  2. 根据权利要求1所述的电芯，其特征在于，对齐的所述第一延展部和所述第二延展部共同形成所述电芯的扩容区；
    所述扩容区位于多个所述第一内极耳与多个第二内极耳之间；或者，所述扩容区包括多个部分，至少一个部分位于多个所述第一内极耳与多个第二内极耳之间，至少一个部分位于多个所述第一内极耳远离多个所述第二内极耳的一侧、或者位于多个所述第二内极耳远离多个所述第一内极耳的一侧。
  3. 根据权利要求1所述的电芯，其特征在于，所述第一延展部的数量为多个，多个所述第一延展部连接于所述第一主体部的顶边的不同位置。
  4. 根据权利要求1至3中任一项所述的电芯，其特征在于，所述电芯还包括保护膜、第一外极耳及第二外极耳；
    多个所述第一内极耳的末端彼此接触地堆叠设置，且共同焊接所述第一外极耳；
    多个所述第二内极耳的末端彼此接触地堆叠设置，且共同焊接所述第二外极耳；
    所述保护膜包裹所述第一极片、所述第二极片、所述第一外极耳的一端以及所述第二外极耳的一端，所述第一外极耳的另一端和所述第二外极耳的另一端位于所述保护膜的外侧。
  5. 根据权利要求1至3中任一项所述的电芯，其特征在于，所述第一主体部还包括底边，所述第一主体部的顶边与底边平行设置；
    所述第二主体部还包括底边，所述第二主体部的顶边与底边平行设置。
  6. 根据权利要求1至3中任一项所述的电芯，其特征在于，所述第一主体部和所述第一延展部均包括集流体和涂布于所述集流体的表面的浆料，所述第一主体部的集流体、所述第一延展部的集流体及多个所述第一内极耳一体成型，所述第一主体部的浆料和所述第一延展部的浆料一体成型。
  7. 一种电芯，其特征在于，包括多个第一极片、多个第二极片、多个第一内极耳以及多个第二内极耳；
    所述第一极片包括第一主体部和第一延展部，所述第一延展部和所述第一内极耳均连接所述第一主体部的顶边且彼此间隔，所述第一主体部、所述第一延展部及所述第一内极耳一体成型；
    所述第二极片包括第二主体部和第二延展部，所述第二延展部和所述第二内极耳均连接所述第二主体部的顶边且彼此间隔，所述第二主体部、所述第二延展部及所述第二内极耳一 体成型；
    多个所述第一极片与多个所述第二极片交替地堆叠设置且彼此间隔，多个所述第一内极耳对齐设置，多个所述第二内极耳对齐设置，所述第一延展部与所述第二延展部对齐设置。
  8. 根据权利要求7所述的电芯，其特征在于，对齐的所述第一延展部和所述第二延展部共同形成所述电芯的扩容区；
    所述扩容区位于多个所述第一内极耳与多个第二内极耳之间；或者，所述扩容区包括多个部分，至少一个部分位于多个所述第一内极耳与多个第二内极耳之间，至少一个部分位于多个所述第一内极耳远离多个所述第二内极耳的一侧、或者位于多个所述第二内极耳远离多个所述第一内极耳的一侧。
  9. 根据权利要求7或8所述的电芯，其特征在于，所述电芯还包括保护膜、第一外极耳及第二外极耳；
    多个所述第一内极耳的末端彼此接触地堆叠设置，且共同焊接所述第一外极耳；
    多个所述第二内极耳的末端彼此接触地堆叠设置，且共同焊接所述第二外极耳；
    所述保护膜包裹多个所述第一极片、多个所述第二极片、所述第一外极耳的一端以及所述第二外极耳的一端，所述第一外极耳的另一端和所述第二外极耳的另一端位于所述保护膜的外侧。
  10. 根据权利要求7或8所述的电芯，其特征在于，所述第一主体部还包括底边，所述第一主体部的顶边与底边平行设置；
    所述第二主体部还包括底边，所述第二主体部的顶边与底边平行设置。
  11. 根据权利要求7或8所述的电芯，其特征在于，所述第一主体部和所述第一延展部均包括集流体和涂布于所述集流体的表面的浆料，所述第一主体部的集流体、所述第一延展部的集流体及所述第一内极耳一体成型，所述第一主体部的浆料和所述第一延展部的浆料一体成型。
  12. 一种电池，其特征在于，包括权利要求1至11中任一项所述的电芯。
  13. 根据权利要求12所述的电池，其特征在于，所述电池还包括软硬结合板，所述软硬结合板固定于所述电芯的顶部，且电连接所述电芯。
  14. 一种电子设备，其特征在于，包括壳体和权利要求12或13所述的电池，所述电池安装于所述壳体内。
PCT/CN2022/074540 2021-02-08 2022-01-28 电芯、电池及电子设备 WO2022166804A1 (zh)

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Publication number Priority date Publication date Assignee Title
CN206727177U (zh) * 2017-03-16 2017-12-08 宁德时代新能源科技股份有限公司 二次电池及电池包
CN110021716A (zh) * 2018-01-08 2019-07-16 比亚迪股份有限公司 电池单元、电池模组及汽车
CN110797503A (zh) * 2018-08-01 2020-02-14 宁德时代新能源科技股份有限公司 二次电池
CN110797478A (zh) * 2018-08-01 2020-02-14 宁德时代新能源科技股份有限公司 二次电池
CN112310514A (zh) * 2020-10-27 2021-02-02 合肥国轩高科动力能源有限公司 锂离子电池

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CN206727177U (zh) * 2017-03-16 2017-12-08 宁德时代新能源科技股份有限公司 二次电池及电池包
CN110021716A (zh) * 2018-01-08 2019-07-16 比亚迪股份有限公司 电池单元、电池模组及汽车
CN110797503A (zh) * 2018-08-01 2020-02-14 宁德时代新能源科技股份有限公司 二次电池
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