CN115000643A - Battery cell structure and battery cell preparation method - Google Patents

Battery cell structure and battery cell preparation method Download PDF

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Publication number
CN115000643A
CN115000643A CN202210621139.2A CN202210621139A CN115000643A CN 115000643 A CN115000643 A CN 115000643A CN 202210621139 A CN202210621139 A CN 202210621139A CN 115000643 A CN115000643 A CN 115000643A
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China
Prior art keywords
pole
pole core
group
tab
core
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Pending
Application number
CN202210621139.2A
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Chinese (zh)
Inventor
陈毅滨
仲亮
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Guangzhou Xiaopeng Motors Technology Co Ltd
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Guangzhou Xiaopeng Motors Technology Co Ltd
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Priority to CN202210621139.2A priority Critical patent/CN115000643A/en
Publication of CN115000643A publication Critical patent/CN115000643A/en
Pending legal-status Critical Current

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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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • 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
    • H01M10/0431—Cells with wound or folded electrodes
    • 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
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • 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
    • 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • 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
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • 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

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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)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The application relates to a battery cell structure and a battery cell preparation method. The battery cell structure comprises a pole core and a pole. The pole core is winding type pole core or lamination type pole core, and the pole core has a plurality of blank foil pieces that extend, and a plurality of blank foil pieces that have the same polarity divide into two at least groups, and the one end coincide of keeping away from the pole core on the blank foil piece in every group forms utmost point ear crowd, and the polarity of two at least utmost point ear crowd is the same and separate each other, and utmost point post is connected in two at least utmost point ear crowds that have the same polarity to collect the electric current that a plurality of blank foil pieces exported from the pole core. The blank foils of the battery cell structure are integrated to form at least two tab groups with the same polarity, so that the number of layers and the thickness of a single tab group are reduced, the welding difficulty is reduced, and the material utilization rate is improved. Furthermore, the thinned tab group occupies less space, and can be used for increasing the size of the pole piece and improving the energy density of the cell structure.

Description

Battery cell structure and battery cell preparation method
Technical Field
The application relates to the technical field of batteries, in particular to a battery cell structure and a battery cell preparation method.
Background
With the rapid development of new energy markets, the energy density of lithium ion batteries required by electric vehicles is higher and higher, and in order to improve the energy density, battery manufacturers improve the utilization rate of internal space, the size of batteries and other aspects from the design of a chemical system and an internal structure.
In the current production of lithium batteries, especially the tab of a laminated battery is usually manufactured by a method of leading out foils from a pole piece, shaping a plurality of foils together after lamination and welding to form the tab. However, the tab group formed in this way is thick, so that the foil is easily broken, the material utilization rate is low, and the cost is increased.
Disclosure of Invention
The embodiment of the application provides a battery cell structure and a battery cell preparation method.
According to a first aspect of the present application, an embodiment of the present application provides a cell structure, which includes a pole core and a pole. The pole core is winding type pole core or lamination type pole core, the pole core has a plurality of blank foil pieces that extend, a plurality of blank foil pieces that have the same polarity divide into two at least groups, keep away from the pole core on the blank foil piece in every group one end coincide and form corresponding utmost point ear crowd, the polarity of two at least utmost point ear crowd is the same and interval each other, utmost point post is connected in two at least utmost point ear crowds that have the same polarity to collect the electric current that a plurality of blank foil pieces exported from the pole core.
According to a second aspect of the present application, an embodiment of the present application provides a method for manufacturing a battery cell, where the method includes providing a plurality of pole pieces; laminating a plurality of pole pieces to form a pole core, wherein the end parts of the pole pieces extend to form a plurality of blank foils; dividing the plurality of blank foils into at least two groups, shaping one end of each group of blank foils, which is far away from the pole core, to form a pole lug group, and forming at least two pole lug groups by the at least two groups of blank foils; and connecting the pole to at least two pole lug groups so as to collect the current led out from the pole core by the plurality of blank foils.
In the electric core structure that this application embodiment provided, the pole piece can be coiling formula pole piece or lamination formula pole piece, and is less to the restriction of pole piece, and the pole piece has a plurality of blank foils of extension, and keeps away from the one end coincide of pole piece on the blank foil that has the same polarity and form two at least polarity the same, the utmost point ear crowd at interval each other, and utmost point post is connected in two at least utmost point ear crowd that have the same polarity to collect the electric current that a plurality of blank foils were derived from the pole piece. The blank foils of the battery cell structure are integrated to form at least two tab groups with the same polarity, so that the number of layers and the thickness of a single tab group are reduced, the welding difficulty is reduced, and the material utilization rate is improved. Furthermore, the thinned tab group occupies less space, and can be used for increasing the size of the pole piece and improving the energy density of the cell structure.
Drawings
In order to more clearly illustrate the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic perspective structure diagram of a cell structure provided in an embodiment of the present application.
Fig. 2 is a schematic diagram of the cell structure shown in fig. 1.
Fig. 3 is another schematic view of the cell structure shown in fig. 1.
Fig. 4 is yet another schematic diagram of the cell structure shown in fig. 1.
Fig. 5 is yet another schematic diagram of the cell structure shown in fig. 1.
Fig. 6 is a schematic perspective view of a connector of the cell structure shown in fig. 1.
Fig. 7 is a schematic perspective view of another cell structure provided in an embodiment of the present application.
Fig. 8 is a schematic diagram of the cell structure shown in fig. 7.
Fig. 9 is another schematic view of the cell structure shown in fig. 7.
Fig. 10 is yet another schematic diagram of the cell structure of fig. 7.
Fig. 11 is yet another schematic diagram of the cell structure of fig. 7.
Fig. 12 is a schematic perspective view of a connector of the cell structure shown in fig. 7.
Fig. 13 is a schematic flow chart of a cell preparation method provided in an embodiment of the present application.
Fig. 14 is a schematic flow chart of another cell preparation method provided in the embodiment of the present application.
Fig. 15 is a schematic view of a manufacturing process of a connection member in the cell manufacturing method shown in fig. 14.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
As used in this specification and the appended claims, certain terms are used to refer to particular components, and it will be appreciated by those skilled in the art that a manufacturer of hardware may refer to a component by different names. The specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to,"; "substantially" means that a person skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect.
The cell structure and the cell testing method proposed in the present application will be further described with reference to the following detailed description and the schematic drawings.
Referring to fig. 1 and fig. 2, a cell structure 100 is provided in an embodiment of the present disclosure. The battery cell structure 100 includes a pole core 10 and a pole 50. In the present embodiment, the pole core 10 may be a wound pole core in some embodiments, and the pole core 10 may be a laminated pole core in other embodiments. The pole core 10 is provided with a plurality of extended blank foils 30, the plurality of blank foils 30 with the same polarity are divided into at least two groups, one end of each blank foil 30 in each group, which is far away from the pole core 10, is overlapped to form a corresponding pole lug group 32, the number of layers of the single pole lug group 32 can be effectively reduced, and the thickness of the single pole lug group 32 is reduced. Further, at least two tab groups 32 have the same polarity and are spaced apart from each other, and at least two tab groups 32 having the same polarity are connected to the same pole 50, and the pole 50 is used for collecting the current led out from the pole core 10 by the plurality of blank foils 30.
In the battery cell structure 100 provided by the embodiment of the present application, the pole core 10 may be a winding type pole core or a laminated type pole core, the limitation to the pole core 10 is small, the pole core 10 has a plurality of extended blank foils 30, and one end of the blank foils 30 with the same polarity, which is far away from the pole core 10, is overlapped to form at least two tab groups 32 with the same polarity and spaced from each other, and the pole column 50 is connected to at least two tab groups 32 with the same polarity, so as to collect the current led out from the pole core 10 by the plurality of blank foils 30. The blank foils 30 of the cell structure 100 are integrated to form at least two tab groups 32 with the same polarity, so that the number of layers and the thickness of a single tab group 32 are reduced, the welding difficulty is reduced, and the material utilization rate is improved. Further, the thinned tab group 32 occupies less space, and may be used to increase the size of the pole piece and improve the energy density of the cell structure 100.
In the present embodiment, the number of the pole cores 10 is not limited, in some embodiments, the number of the pole cores 10 may be one, the blank foils 30 having the same polarity of one pole core 10 form at least two tab groups 32, and in other embodiments, the number of the pole cores 10 may be two, and the blank foils 30 having the same polarity of two pole cores 10 form at least two tab groups 32.
In this application, the terms "mounted," "connected," "secured," and the like are to be construed broadly unless otherwise specifically stated or limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate member, or they may be connected through the inside of two members or they may be merely surface-contacting. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
For example, in the embodiment shown in fig. 3, the number of pole cores 10 is one, and the thickness of the pole core 10 may range from 5mm to 20 mm. Specifically, the pole core 10 includes a sub-pole core 12, and the sub-pole core 12 may include a plurality of pole pieces (not shown in the drawings) with the same polarity, and the pole pieces with the same polarity are all of the same pole piece configuration, which can reduce the processing complexity of the battery cell structure 100. Further, the plurality of blank foils 30 with the same polarity are divided into at least two groups, one end of each blank foil 30 in each group, which is far away from the pole piece, is overlapped to form a corresponding pole lug group 32, and the blank foils 30 contained in each pole lug group 32 are sequentially stacked, so that the number of layers of the single pole lug group 32 can be effectively reduced, the thickness of the single pole lug group 32 is reduced, the blank foils 30 do not need to be increased along with the increase of the number of layers of the pole pieces, and the utilization rate of materials is improved. In the present embodiment, the plurality of blank foils 30 are substantially equally divided into two groups, and accordingly, the number of tab groups 32 is also two. The two tab groups 32 include a first tab group 321 and a second tab group 323, and the first tab group 321 and the second tab group 323 have the same polarity. In this embodiment, specific positions of the first tab group 321 and the second tab group 323 are not limited, in some embodiments, the first tab group 321 and the second tab group 323 are both disposed at a substantially middle position of an end portion of the pole core 10 (i.e., the sub-pole core 12) in the thickness direction (as shown in fig. 3), and the first tab group 321 and the second tab group 323 are sequentially disposed at intervals along the thickness direction X of the pole core 10, so that the positions of the tab groups 32 are concentrated, the tab groups 32 are conveniently connected with the poles 50, and the processing difficulty of the battery cell structure 100 is reduced. In other embodiments, the first tab group 321 and the second tab group 323 are disposed on two opposite sides of the end portion of the pole core 10 in the thickness direction (as shown in fig. 4), and the first tab group 321 and the second tab group 323 are sequentially disposed at intervals along the thickness direction X of the pole core 10, so that the difficulty of shaping the blank foil 30 into the tab group 32 can be reduced, the independence of the first tab group 321 and the second tab group 323 can be improved, and the first tab group 321 and the second tab group 323 are prevented from interfering with each other. Furthermore, the projections of the first tab group 321 and the second tab group 323 in the thickness direction X of the pole core 10 are overlapped, so that the tab group 32 can be directly connected to the pole 50. It should be understood that, in other embodiments, the plurality of blank foils 30 may be divided into three groups, four groups, five groups, etc., for example, the plurality of blank foils 30 may be divided into three groups approximately equally, and accordingly, the number of the tab groups 32 is also three, the three tab groups 32 have the same polarity, and the three tab groups 32 are sequentially spaced along the thickness direction X of the pole core 10, and the three tab groups 32 having the same polarity are all connected to the same pole 50.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "inside", and the like indicate orientations or positional relationships based on those shown in the drawings, and are simply used for convenience of description of the present application, and do not indicate or imply that the referred devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Referring to fig. 2 again, the first tab group 321 and the second tab group 323 are both connected to the same pole 50, so as to communicate the pole core 10 with an external circuit. In this embodiment, the connection manner of the pole 50 and the first tab group 321 and the second tab group 323 is not limited, in some embodiments, the first tab group 321 and the second tab group 323 may be directly connected to the pole 50 (as shown in fig. 2), in other embodiments, the first tab group 321 and the second tab group 323 may be indirectly connected to the pole 50, for example, the first tab group 321 and the second tab group 323 may be connected to the pole 50 by a connector (as shown in fig. 5).
For example, referring to fig. 5, in the embodiment of the present application, the battery cell structure 100 further includes a connecting member 70, and the connecting member 70 is connected to the first tab group 321 and the second tab group 323 and connected to the pole 50, so as to connect the first tab group 321 and the second tab group 323 to the same pole 50. Referring to fig. 6, the connecting member 70 may include a pole connecting portion 72, a bending portion 74 and a clamping portion 76. The post connecting portion 72 is substantially rectangular and flat for connecting the post 50, further, the post connecting portion 72 may be provided with a mounting groove 721, the mounting groove 721 is substantially located at the middle position of the post connecting portion 72, the post 50 can be at least partially embedded in the mounting groove 721, and the connection strength between the post 50 and the post connecting portion 72 is increased. The bent portion 74 is connected to the pole connecting portion 72 and bent with respect to the pole connecting portion 72, specifically, one end of the bent portion 74 is connected to the pole connecting portion 72, and the other end of the bent portion 74 is bent to a side away from the mounting groove 721. In this embodiment, the number of the bent portions 74 may be two, each bent portion 74 includes a first bent portion 741 and a second bent portion 743, the first bent portion 741 is connected to one side of the terminal connecting portion 72, the second bent portion 743 is connected to one side of the terminal connecting portion 72 away from the first bent portion 741, and the second bent portions 743 and the first bent portions 741 are staggered, that is, projections of the first bent portions 741 and the second bent portions 743 on a plane where the terminal connecting portion 72 is located do not completely overlap. The clamping portion 76 is connected to the bent portion 74 and bent with respect to the bent portion 74, the clamping portion 76, the bent portion 74 and the pole connecting portion 72 together form a clamping space 78, and the tab group 32 is at least partially disposed in the clamping space 78. One end of the clamping portion 76 is connected to the side of the bending portion 74 away from the pole connecting portion 72, and the other end of the clamping portion 76 is bent toward the side close to the pole connecting portion 72, so that the clamping portion 76 is spaced apart from the pole connecting portion 72 to form a clamping space 78.
In the embodiment of the present application, the number of the clamping portions 76 is also two, the two clamping portions 76 include a first clamping portion 761 and a second clamping portion 763, the first clamping portion 761 is connected to the first bent portion 741, the second clamping portion 763 is connected to the second bent portion 743, accordingly, the number of the clamping spaces 78 is also two, the two clamping spaces 78 include a first clamping space 781 and a second clamping space 783, the first clamping portion 761, the first bent portion 741 and the post connecting portion 72 together form the first clamping space 781, the first tab group 321 is at least partially disposed in the first clamping space 781, the second clamping portion 763, the second bent portion 743 and the post connecting portion 72 together form the second clamping space 783, the second tab group 323 is at least partially disposed in the second clamping space 783, the connecting member 70 is capable of connecting the first tab group 321 and the second tab group 323 to the same post 50, the connection strength between the first tab group 321 and the second tab group 323 and the pole 50 is increased.
Referring to fig. 5 again, the pole 50 is connected to the first tab group 321 and the second tab group 323 to collect the current from the pole core 10 by the plurality of blank foils 30. In the embodiment of the present invention, the electrode post 50 may include a cover plate portion 52 and an electrical connection portion 54, the cover plate portion 52 covers an end portion of the electrode core 10 and can protect the electrode core 10, the electrical connection portion 54 is connected between the cover plate portion 52 and the tab group 32, in the embodiment of the present invention, the electrical connection portion 54 is substantially cylindrical, and the electrical connection portion 54 is configured to collect current led out from the electrode core 10 by the plurality of blank foils 30. In the present embodiment, the connection manner of the electrical connection portion 54 and the tab group 32 is not limited, in some embodiments, the electrical connection portion 54 is directly connected to the first tab group 321 and the second tab group 323, in other embodiments, the electrical connection portion 54 is connected to the first tab group 321 and the second tab group 323 through the connection member 70, specifically, the electrical connection portion 54 is connected to the tab connection portion 72 of the connection member 70, and further, the electrical connection portion 54 may be at least partially embedded in the installation groove 721, so as to enhance the connection strength between the electrical connection portion 54 and the connection member 70.
In some embodiments, the pole pieces in the pole core 10 are positive pole pieces, and accordingly, the blank foils 30 are aluminum foils corresponding to the positive pole pieces one to one, the tab group 32 formed by overlapping the ends of the aluminum foils away from the pole core is a positive pole tab group, and the pole 50 is a positive pole post connected to the positive pole tab group in order to adapt to the polarity of the tab group 32.
In other embodiments, the pole pieces in the pole core 10 are negative pole pieces, correspondingly, the plurality of blank foils 30 are copper foils, the plurality of copper foils correspond to the negative pole pieces one to one, the tab group 32 formed by overlapping one ends of the copper foils far away from the pole core is a negative pole tab group, and in order to adapt to the polarity of the tab group 32, the pole 50 is a negative pole post connected to the negative pole tab group.
In still other embodiments, the pole pieces in the pole core 10 include a positive pole piece and a negative pole piece, accordingly, the blank foils 30 include aluminum foils and copper foils, the aluminum foils correspond to the positive pole piece one to one, the aluminum foils correspond to the negative pole piece one to one, the tab group 32 formed by overlapping the ends of the aluminum foils away from the pole core is a positive tab group, and the tab group 32 formed by overlapping the ends of the copper foils away from the pole core is a negative tab group, further, in some embodiments, the positive tab group and the negative tab group may be disposed at the same end of the pole core 10 in the thickness direction, and in other embodiments, the positive tab group and the negative tab group may be disposed at opposite ends of the pole core 10 in the thickness direction. In order to adapt to the polarity of the tab group 32, the terminals 50 include two types, including a positive terminal connected to the positive tab group and a negative terminal connected to the negative tab group.
In the above embodiments of the present specification, the number of pole cores 10 is one, and it includes one sub-pole core 12, and it should be understood that in other embodiments, the number of pole cores 10 may be plural, and two pole cores 10 will be described as an example.
Referring to fig. 7 and 8, the pole piece 10 includes a first sub-pole piece 14 and a second sub-pole piece 16, and the total thickness of the pole piece 10 may be 10mm to 40 mm. The first sub-pole core 14 and the second sub-pole core 16 each include a plurality of pole pieces (not shown) with the same polarity, and the pole pieces with the same polarity are all of the same pole piece configuration, so that the processing complexity of the battery cell structure 100 can be reduced. Furthermore, the plurality of blank foils 30 with the same polarity are divided into at least two groups, one end of each blank foil 30 in each group, which is far away from the pole piece, is overlapped to form a corresponding pole lug group 32, and the blank foils 30 contained in each pole lug group 32 are sequentially stacked, so that the number of layers of a single pole lug group 32 can be effectively reduced, the thickness of the single pole lug group 32 is reduced, the blank foils 30 do not need to be increased along with the increase of the number of layers of the pole pieces, and the utilization rate of materials is improved. In the present embodiment, the plurality of blank foils 30 are substantially equally divided into two groups, and accordingly, the number of the tab groups 32 is also two. The two tab groups 32 include a first tab group 321 and a second tab group 323, one end of the blank foil 30 of the first sub-pole core 14, which is far away from the first sub-pole core 14, is overlapped to form the first tab group 321, one end of the blank foil 30 of the second sub-pole core 16, which is far away from the second sub-pole core 16, is overlapped to form the second tab group 323, and the polarities of the first tab group 321 and the second tab group 323 are the same. In this embodiment, specific positions of the first tab group 321 and the second tab group 323 are not limited, in some embodiments, the first tab group 321 is disposed on a side of the first sub-pole core 14 close to the second sub-pole core 16, and the second tab group 323 is disposed on a side of the second sub-pole core 16 close to the first sub-pole core 14, that is, the first tab group 321 and the second tab group 323 are disposed at approximately middle positions of end portions of the pole cores 10 in the thickness direction (as shown in fig. 9), so that positions of the tab groups 32 are relatively concentrated, connection between the tab groups 32 and the poles 50 is facilitated, and processing difficulty of the battery cell structure 100 is reduced. In other embodiments, the first tab group 321 is disposed on a side of the first sub-pole core 14 away from the second sub-pole core 16, and the second tab group 323 is disposed on a side of the second sub-pole core 16 away from the first sub-pole core 14, that is, the first tab group 321 and the second tab group 323 are disposed on opposite sides of the end portion of the pole core 10 in the thickness direction (as shown in fig. 10), which can reduce the difficulty of shaping the blank foil 30 into the tab group 32, and can also improve the independence of the first tab group 321 and the second tab group 323, thereby avoiding the first tab group 321 and the second tab group 323 from interfering with each other.
Further, the first tab group 321 and the second tab group 323 are stacked in the thickness direction X of the pole core 10, and in some embodiments, the projections of the first tab group 321 and the second tab group 323 in the thickness direction of the pole core 10 do not have an overlapping portion, for example, the projections of the first tab group 321 and the second tab group 323 in the thickness direction of the pole core 10 may completely overlap, for example, the projections of the first tab group 321 and the second tab group 323 in the thickness direction of the pole core 10 may partially overlap, and for example, the projection of the first tab group 321 in the thickness direction of the pole core 10 may include the projection of the second tab group 323 in the thickness direction of the pole core 10. In other embodiments, the projections of the first tab group 321 and the second tab group 323 in the thickness direction of the pole core 10 do not have an overlapping portion, which can reduce the internal space occupied by the white foil 30 in the pole core 10 and reduce the size of the battery cell structure 100. It should be understood that, in other embodiments, the plurality of blank foils 30 may be divided into three groups, four groups, five groups, etc., for example, the plurality of blank foils 30 may be divided into three groups approximately equally, accordingly, the number of the tab groups 32 is also three, the three tab groups 32 are sequentially spaced along the thickness direction X of the pole core 10, and the three tab groups 32 are all connected to the same pole column 50.
Referring to fig. 8 again, the first tab group 321 and the second tab group 323 are connected to the same pole 50, so as to communicate the pole core 10 with an external circuit. In this embodiment, the connection manner of the pole 50 and the first tab group 321 and the second tab group 323 is not limited, in some embodiments, the first tab group 321 and the second tab group 323 may be directly connected to the pole 50 (as shown in fig. 8), in other embodiments, the first tab group 321 and the second tab group 323 may be indirectly connected to the pole 50, for example, the first tab group 321 and the second tab group 323 may be connected to the pole 50 by a connector (as shown in fig. 11).
For example, referring to fig. 11, in the embodiment of the present application, the battery cell structure 100 further includes a connecting member 80, and the connecting member 80 is connected to the first tab group 321 and the second tab group 323 and connected to the pole 50, so as to connect the first tab group 321 and the second tab group 323 to the same pole 50. Referring to fig. 12, the connecting member 80 may include a pole connecting portion 82, a bending portion 84, and a clamping portion 86. The post connecting portion 82 is substantially rectangular and flat, and is used for connecting the post 50, further, the post connecting portion 82 may be provided with a mounting groove 821, the mounting groove 821 is substantially located at the middle position of the post connecting portion 82, the post 50 can be at least partially embedded into the mounting groove 821, and the connection strength between the post 50 and the post connecting portion 82 is increased. The bent portion 84 is connected to the pole connecting portion 82 and bent with respect to the pole connecting portion 82, and specifically, one end of the bent portion 84 is connected to the pole connecting portion 82, and the other end of the bent portion 84 is bent to a side away from the mounting groove 821. In this embodiment, the number of the bending portions 84 may be two, each of the bending portions 84 includes a first bending portion 841 and a second bending portion 843, the first bending portion 841 is connected to one side of the terminal post connecting portion 82, the second bending portion 843 is connected to one side of the terminal post connecting portion 82 away from the first bending portion 841, and the second bending portion 843 and the first bending portion 841 are staggered, that is, the projections of the first bending portion 841 and the second bending portion 843 on the plane where the terminal post connecting portion 82 is located do not completely coincide with each other. The clamping portion 86 is connected to the bent portion 84 and bent with respect to the bent portion 84, the clamping portion 86, the bent portion 84, and the pole connecting portion 82 together form a clamping space 88, and the tab group 32 is at least partially disposed in the clamping space 88. One end of the clamping portion 86 is connected to the side of the bending portion 84 away from the pole connecting portion 82, and the other end of the clamping portion 86 is bent toward the side close to the pole connecting portion 82, so that the clamping portion 86 and the pole connecting portion 82 are oppositely arranged at an interval to form a clamping space 88.
In the embodiment of the present application, the number of the clamping portions 86 is also two, the two clamping portions 86 include a first clamping portion 861 and a second clamping portion 863, the first clamping portion 861 is connected to the first bent portion 841, the second clamping portion 863 is connected to the second bent portion 843, correspondingly, the number of the clamping spaces 88 is also two, the two clamping spaces 88 include a first clamping space 881 and a second clamping space 883, the first clamping portion 861, the first bent portion 841 and the pole connecting portion 82 together form the first clamping space 881, the first tab group 321 is at least partially disposed in the first clamping space 881, the second clamping portion 863, the second bent portion 843 and the pole connecting portion 82 together form the second clamping space 883, the second tab group 323 is at least partially disposed in the second clamping space 883, the connecting member 80 is capable of connecting the first tab group 321 and the second tab group 323 to the same pole 50, the connection strength between the first tab group 321 and the second tab group 323 and the pole 50 is increased.
The electrode post 50 is connected to the first tab group 321 and the second tab group 323 to collect the current led from the electrode core 10 by the plurality of blank foils 30. In the embodiment of the present invention, the electrode post 50 may include a cover plate portion 52 and an electrical connection portion 54, the cover plate portion 52 covers an end portion of the electrode core 10 and can protect the electrode core 10, the electrical connection portion 54 is connected between the cover plate portion 52 and the tab group 32, in the embodiment of the present invention, the electrical connection portion 54 is substantially cylindrical, and the electrical connection portion 54 is configured to collect current led out from the electrode core 10 by the plurality of blank foils 30. In the present embodiment, the connection manner of the electrical connection portion 54 and the tab group 32 is not limited, in some embodiments, the electrical connection portion 54 is directly connected to the first tab group 321 and the second tab group 323, in other embodiments, the electrical connection portion 54 is connected to the first tab group 321 and the second tab group 323 through the connection member 70, specifically, the electrical connection portion 54 is connected to the tab connection portion 72 of the connection member 70, and further, the electrical connection portion 54 may be at least partially embedded in the installation groove 721, so as to enhance the connection strength between the electrical connection portion 54 and the connection member 70.
In some embodiments, the pole pieces in the pole core 10 include positive pole pieces, and accordingly, the plurality of blank foils 30 are aluminum foils, the plurality of aluminum foils are connected to the positive pole pieces in a one-to-one correspondence, the tab group 32 formed by overlapping one ends of the aluminum foils away from the pole core is a positive pole tab group, and in order to adapt to the polarity of the tab group 32, the pole 50 is a positive pole post, and the positive pole post is connected to the positive pole tab group.
In other embodiments, the pole pieces in the pole core 10 are negative pole pieces, and correspondingly, the plurality of blank foils 30 are copper foils, the plurality of copper foils are connected to the negative pole pieces in a one-to-one correspondence, the tab group 32 formed by overlapping one ends of the copper foils far away from the pole core is a negative pole tab group, and in order to adapt to the polarity of the tab group 32, the pole 50 is a negative pole post connected to the negative pole tab group.
In still other embodiments, the pole pieces in the pole core 10 include a positive pole piece and a negative pole piece, accordingly, the plurality of blank foils 30 are aluminum foils and copper foils, the plurality of aluminum foils are connected to the positive pole piece in a one-to-one correspondence, the plurality of aluminum foils are connected to the negative pole piece in a one-to-one correspondence, the tab group 32 formed by overlapping the ends of the aluminum foils far away from the pole core is a positive tab group, and the tab group 32 formed by overlapping the ends of the copper foils far away from the pole core is a negative tab group, further, in some embodiments, the positive tab group and the negative tab group may be disposed at the same end of the pole core 10, and in other embodiments, the positive tab group and the negative tab group may be disposed at opposite ends of the pole core 10. In order to adapt to the polarity of the tab group 32, the terminals 50 include two types, including a positive terminal connected to the positive tab group and a negative terminal connected to the negative tab group.
In the electric core structure that this application embodiment provided, the pole piece can be coiling formula pole piece or lamination formula pole piece, and is less to the restriction of pole piece, and the pole piece has a plurality of blank foils of extension, and keeps away from the one end coincide of pole piece on the blank foil that has the same polarity and form two at least polarity the same, the utmost point ear crowd at interval each other, and utmost point post is connected in two at least utmost point ear crowd that have the same polarity to collect the electric current that a plurality of blank foils were derived from the pole piece. The blank foils of the battery cell structure are integrated to form at least two tab groups with the same polarity, so that the number of layers and the thickness of a single tab group are reduced, the welding difficulty is reduced, and the material utilization rate is improved. Furthermore, the thinned tab group occupies less space, and can be used for increasing the size of the pole piece and improving the energy density of the cell structure.
Referring to fig. 13, based on the cell structure 100 provided in the foregoing embodiment, an embodiment of the present application further provides a cell testing method, which is used for the cell testing method. The method includes the following steps S110 to S140.
Step S110, providing a plurality of pole pieces.
In this embodiment, a plurality of pole pieces are provided for making the pole core, in some embodiments, the pole pieces may be positive pole pieces, in other embodiments, the pole pieces may be negative pole pieces, and in still other embodiments, the pole pieces may be positive pole pieces and negative pole pieces. The plurality of positive plates are of the same pole piece configuration, and the plurality of negative plates are of the same pole piece configuration.
Step S120 is to laminate a plurality of pole pieces to form a pole core.
In this embodiment, a plurality of pole pieces are stacked to form a pole core 10, the end portions of the pole pieces extend to form a plurality of blank foils 30, the plurality of blank foils 30 correspond to the plurality of pole pieces one to one, if the pole piece is a positive pole piece, the blank foil 30 is an aluminum foil, and if the pole piece is a negative pole piece, the blank foil 30 is a copper foil.
In the present embodiment, the number of pole cores 10 is not limited, and in some embodiments, the number of pole cores 10 may be one, that is, a plurality of pole pieces are stacked to form one sub-pole core 12, and in other embodiments, the number of pole cores 10 may be two, that is, a plurality of pole pieces are stacked to form a first sub-pole core 14 and a second sub-pole core 16, and the first sub-pole core 14 and the second sub-pole core 14 are stacked in the thickness direction of the pole core 10.
Step S130, dividing the plurality of blank foils into at least two groups, and shaping one end of each group of blank foils away from the pole core to form a pole ear group.
In the present embodiment, the plurality of blank foils 30 are divided into at least two groups, and one end of each group of blank foils 30 away from the pole core 10 is shaped to form the tab group 32. Specifically, each set of blank foils 30 is separately bent and shaped and laminated together. The end of the bent blank foil 30 far away from the pole core 10 forms a straight section, the end close to the pole core 10 forms a bent section, the straight sections are laminated together, and the bent sections are sequentially abutted against the side wall of the pole core 10. When welding, the straight sections on all the blank foil sheets 30 are welded to form the tab group 32 integrally.
In this embodiment, the specific structure of the tab group 32 may refer to the description of the features of the tab group 32 of the battery cell structure, and is not described in detail here.
Step S140, connecting the pole to at least two tab groups.
In the present embodiment, the pole 50 is connected to at least two tab groups 32 to collect the current drawn from the pole core 10 by the plurality of blank foils 30. In some embodiments, the pole and the tab group can be connected together by welding, and in other embodiments, the pole and the tab group can be connected together by a connecting member.
Therefore, in the above battery cell manufacturing method provided in this embodiment of the present application, a plurality of pole pieces are provided, the pole pieces are stacked to form a pole core 10, the end portions of the pole pieces extend to form a plurality of blank foils 30, the blank foils 30 are divided into at least two groups, one end of each blank foil 30 in each group, which is far away from the pole piece, is overlapped to form a tab group 32, and a pole 50 is connected to at least two tab groups 32, so as to collect the current led out from the pole core 10 by the blank foils 30. The cell preparation method integrates the blank foils 30 to form at least two tab groups 32, so that the number of layers and the thickness of a single tab group 32 are reduced, the welding difficulty is reduced, and the material utilization rate is improved. Further, the thinned tab group 32 occupies less space, and may be used to increase the size of the pole piece and improve the energy density of the electrical core structure 100.
Referring to fig. 14, an embodiment of the present application further provides a cell testing method, where the method includes the following steps S210 to S260.
Step S210, providing a plurality of pole pieces.
In step S220, a plurality of pole pieces are stacked to form a pole core.
Step S230, dividing the plurality of blank foils into at least two groups, and shaping one end of each group of blank foils away from the electrode core to form a tab group.
In this embodiment, the specific implementation of step S210 to step S230 may refer to the description of step S110 to step S130 provided in the above embodiment, and details are not repeated here.
Step S240, providing a sheet-like substrate.
Referring to fig. 15, in the present embodiment, the substrate used for preparing the connecting element 70 is a sheet-shaped substrate 90, the sheet-shaped substrate 90 includes a connecting portion 92, two folded portions 94 and two fixing portions 96, the two folded portions 94 are respectively disposed on two opposite sides of the connecting portion 92, each fixing portion 96 is connected to a side of the corresponding one of the folded portions 94 away from the connecting portion 92, and the two fixing portions are disposed in a staggered manner in the Y direction.
In some embodiments, prior to step S240, a step of preparing the sheet substrate 90 may also be performed, for example, a sheet raw material may be provided, which may be a steel material, an alloy material, or the like. The sheet-like material is pressed to obtain a sheet-like base material 90 including a connecting portion 92, two folded portions 94, and two fixing portions 96.
Step S250, bending the sheet-shaped base material.
In the present embodiment, after the sheet-shaped base material 90 is bent, the two folded portions 94 are folded with respect to the connecting portion 92, and the two fixing portions 96 are respectively folded with respect to the corresponding folded portions 94, so that the connecting portion 92, the folded portions 94 and the fixing portions 96 together form the clamping space 98, and the tab group 32 is clamped in the clamping space 98.
In an embodiment of the present application, the step of bending the web 90 may include: the two fixing portions 96 are respectively bent in the same direction relative to the folded portions 94, and the two folded portions 94 are folded in the same direction relative to the connecting portion 92, so that each fixing portion 96 is opposite to the connecting portion 92 to form a holding space 98. The step of clamping the tab group 32 in the receiving space 96 may be performed before or after the step of bending the two fixing portions 96 in the same direction with respect to the folded portion 94.
In the present embodiment, when the two fixing portions 96 are respectively bent in the same direction with respect to the folded portion 94, the two fixing portions 96 of the sheet-like base material 90 are bent to be substantially perpendicular to the corresponding folded portion 94, and after bending, the two fixing portions 96 are substantially parallel to each other. In some embodiments, before the tab group 32 is clamped in the accommodating space 96, the two folded portions 94 may be pre-folded to form a space for roughly positioning the tab group 32 on the sheet-shaped substrate 90, and then the tab group 32 is clamped in the accommodating space 96, which is beneficial to improving the assembly efficiency. Based on this, in the method, after the step of bending the sheet-shaped base material 90 and before the step of clamping the tab group 32 in the accommodating space 96, the method for manufacturing the connector may further include: the two folded portions 94 are pre-folded, so that the two folded portions 94 are folded toward the same direction relative to the connecting portion 92, and the angle of the folded portion 94 relative to the connecting portion 92 is smaller than 90 degrees.
Through the above steps, the connecting portion 92 forms the pole connecting portion 72 of the connector 70, the two folded portions 94 are bent and arranged at an interval to form the two bent portions 74 of the connector 70, and the two fixing portions 96 are bent to form the two clamping portions of the connector 70.
And step S260, connecting the pole connecting part with the pole.
The pole connecting portion 72 is connected to the pole 50, so that the pole 50 can collect the electric current drawn from the pole core 10 by the plurality of blank foils 30.
Therefore, in the above battery cell manufacturing method provided in this embodiment of the present application, a plurality of pole pieces are provided, the pole pieces are stacked to form a pole core 10, the end portions of the pole pieces extend to form a plurality of blank foils 30, the blank foils 30 are divided into at least two groups, one end of each blank foil 30 in each group, which is far away from the pole piece, is overlapped to form a tab group 32, and finally, a sheet-shaped substrate 90 is provided and bent, the sheet-shaped substrate 90 is made into a connector 70, and the pole 50 is connected to at least two tab groups 32 through the connector 70, so as to collect the current led out from the pole core 10 by the blank foils 30. The cell preparation method integrates the blank foils 30 to form at least two tab groups 32, so that the number of layers and the thickness of a single tab group 32 are reduced, the welding difficulty is reduced, and the material utilization rate is improved. Further, the thinned tab group 32 occupies less space, and may be used to increase the size of the pole piece and improve the energy density of the cell structure 100. Further, the connection strength between the electrode post 50 and the tab group 32 can be enhanced by connecting the electrode post 50 to the tab group 32 via the connector 70.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims (12)

1. A cell structure, comprising:
a pole core, which is a winding pole core or a laminated pole core,
the pole core is provided with a plurality of extended blank foils, the blank foils with the same polarity are divided into at least two groups, one end of each blank foil in each group, which is far away from the pole core, is superposed to form a corresponding pole lug group, and at least two pole lug groups have the same polarity and are spaced from each other; and
the pole column is connected to at least two pole lug groups with the same polarity so as to collect the current led out from the pole core by the blank foils.
2. The cell structure of claim 1, wherein the pole core comprises a sub-pole core; the blank foils with the same polarity of one sub-pole core form at least two tab groups, and the at least two tab groups comprise a first tab group and a second tab group; the first tab group and the second tab group are connected to the same pole.
3. The cell structure of claim 2, wherein the projections of the first group of tabs and the second group of tabs in the thickness direction of the pole core coincide.
4. The cell structure according to claim 3, wherein the first tab group and the second tab group are disposed in a middle portion of the pole core in a thickness direction; or the like, or, alternatively,
the first pole lug group and the second pole lug group are arranged on two opposite sides of the end part of the pole core in the thickness direction.
5. The cell structure of claim 1, wherein the pole core comprises a first sub-pole core and a second sub-pole core; the at least two tab groups comprise a first tab group and a second tab group, the blank foil of the first sub-pole core forms the first tab group, and the blank foil of the second sub-pole core forms the second tab group; the first pole lug group and the second pole lug group have the same polarity and are connected to the same pole.
6. The cell structure of claim 5, wherein the first sub-pole core and the second sub-pole core are stacked in a thickness direction of the pole core; the projections of the first lug group and the second lug group in the thickness direction have an overlapping part; or the like, or, alternatively,
the first sub-pole core and the second sub-pole core are stacked in a thickness direction of the pole core; the projections of the first lug group and the second lug group in the thickness direction of the pole core do not have overlapping parts.
7. The cell structure of claim 5, wherein the first tab group is disposed on a side of the first sub-pole core that is close to the second sub-pole core; the second pole ear group is arranged on one side of the second sub-pole core close to the first sub-pole core; or the like, or, alternatively,
the first tab group is arranged on one side of the first sub-pole core, which is far away from the second sub-pole core; the second pole ear group is arranged on one side, far away from the first sub-pole core, of the second sub-pole core.
8. The cell structure of claim 1, wherein projections of the two tab groups in a thickness direction of the core are not coincident; the battery cell structure further comprises a connecting piece, the connecting piece is connected to the two tab groups, and the pole is connected to the connecting piece.
9. The cell structure of claim 8, wherein the connector comprises a post connecting portion, a bending portion, and a clamping portion, the post connecting portion being connected to the post; the bending part is connected to the pole connecting part and bends relative to the pole connecting part; the clamping part is connected to the bent part, the pole connecting part, the bent part and the clamping part jointly form a clamping space, and the pole lug group is at least partially arranged in the clamping space.
10. The cell structure according to any of claims 1 to 9, wherein the two tab groups are positive tab groups, and the pole is a positive pole; or the like, or, alternatively,
the two tab groups are negative electrode tab groups, and the pole is a negative pole.
11. A method for preparing a battery cell, the method comprising:
providing a plurality of pole pieces;
laminating a plurality of the pole pieces to form a pole core, wherein the end parts of the pole pieces extend to form a plurality of blank foils;
dividing the plurality of blank foils into at least two groups, shaping one end of each group of blank foils, which is far away from the pole core, to form a pole lug group, and forming at least two pole lug groups by the at least two groups of blank foils;
and connecting a pole to at least two of the pole lug groups so as to collect the current led out from the pole core by the blank foils.
12. The method of claim 11, wherein said connecting a pole to at least two of said groups of tabs comprises:
providing a sheet-shaped base material, wherein the sheet-shaped base material comprises a connecting part, two folding parts and two fixing parts, the two folding parts are respectively arranged at two opposite sides of the connecting part, and each fixing part is connected to one side, far away from the connecting part, of the corresponding folding part;
bending the sheet-shaped base material to bend the two folded parts relative to the connecting part and bend the two fixing parts relative to the corresponding folded parts respectively, so that the connecting part, the folded parts and the fixing parts form an accommodating space together and the tab group is clamped in the accommodating space;
and connecting the pole connecting part with the pole.
CN202210621139.2A 2022-06-01 2022-06-01 Battery cell structure and battery cell preparation method Pending CN115000643A (en)

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WO2020015362A1 (en) * 2018-07-20 2020-01-23 瑞浦能源有限公司 Electrode plate and battery cell of wound lithium-ion battery and method for manufacturing same
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CN101714624A (en) * 2009-09-11 2010-05-26 广州丰江电池新技术股份有限公司 Spiral-line multi-pole lug lithium ion battery and method for manufacturing same
JP2017199652A (en) * 2016-04-25 2017-11-02 株式会社Ｇｓユアサ Energy storage element
JP2018200841A (en) * 2017-05-29 2018-12-20 株式会社豊田自動織機 Manufacturing method of power storage device, and power storage device
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