CN116470156A - Battery winding core, battery and electronic equipment - Google Patents

Battery winding core, battery and electronic equipment Download PDF

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Publication number
CN116470156A
CN116470156A CN202310499943.2A CN202310499943A CN116470156A CN 116470156 A CN116470156 A CN 116470156A CN 202310499943 A CN202310499943 A CN 202310499943A CN 116470156 A CN116470156 A CN 116470156A
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CN
China
Prior art keywords
pole piece
connecting section
battery
section
winding core
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CN202310499943.2A
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Chinese (zh)
Inventor
蒋洪生
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Shanghai Qinkuan Technology Co ltd
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Shanghai Qinkuan Technology Co ltd
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Application filed by Shanghai Qinkuan Technology Co ltd filed Critical Shanghai Qinkuan Technology Co ltd
Priority to CN202310499943.2A priority Critical patent/CN116470156A/en
Publication of CN116470156A publication Critical patent/CN116470156A/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
    • H01M10/0587—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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • 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
    • 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

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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)
  • Secondary Cells (AREA)

Abstract

The invention provides a battery winding core, a battery and electronic equipment, wherein the battery winding core comprises a first pole piece and a second pole piece, and the tail end of the first pole piece exceeds the tail end of the second pole piece in the winding direction to form an exceeding part; the excess portion includes first linkage segment and second linkage segment, and first linkage segment and second linkage segment all have the first end that is close to the terminal of second pole piece to and keep away from the terminal second end of second pole piece, and first end of first linkage segment is located the second end and is in the first side of the axial of battery core, and the first end of second linkage segment is located the second side of second end in the axial of battery core. According to the battery winding core, the first connecting section and the second connecting section are arranged on the exceeding part of the first pole piece, and the directions of currents flowing through the first connecting section and the second connecting section are opposite, so that magnetic fields generated by the first connecting section and the second connecting section can be mutually offset, and the interference of parasitic magnetic fields generated by the part of the first pole piece, from which the second pole piece grows, on a product is reduced.

Description

Battery winding core, battery and electronic equipment
Technical Field
The embodiment of the invention relates to the technical field of batteries, in particular to a battery winding core, a battery and electronic equipment.
Background
Referring to fig. 1 and 2, the cell structure of the conventional wound battery is mostly assembled by adopting a winding manner, and during the charging and discharging process of the wound battery, current flows along a pole piece wound into a cylindrical shape to form an eddy current, and according to the electromagnetic induction principle, the eddy current magnetic field is generated by the change of the current. Based on safety requirements, the negative electrode sheet 1a of the existing battery winding core is longer than the positive electrode sheet 1b by 1/4 to 1/2 of a week. In the process of charging and discharging the wound battery, the currents in the positive electrode plate 1b and the negative electrode plate 1a are the same in magnitude and opposite in direction, and according to the principle of counter-current magnetic field cancellation, the magnetic field generated by one section of the negative electrode plate 1a cannot be cancelled, so that the magnetic field moves outwards to form a parasitic magnetic field. In electromagnetically sensitive products such as wireless headphones, the parasitic magnetic field of the wound battery can seriously affect the use of the wound battery on electromagnetically sensitive products.
Disclosure of Invention
The embodiment of the invention aims to provide a battery winding core, a battery and electronic equipment, and aims to reduce the interference of parasitic magnetic fields generated by battery power supply on products.
In order to solve the technical problems, the embodiment of the invention provides a battery winding core, which comprises a first pole piece and a second pole piece;
the first pole piece and the second pole piece are in fit winding arrangement, the first pole piece and the second pole piece are respectively provided with an end far away from a winding center in a winding direction, and the end of the first pole piece exceeds the end of the second pole piece in the winding direction to form an exceeding part;
the extending part comprises a first connecting section and a second connecting section, the first connecting section and the second connecting section are respectively provided with a first end which is close to the tail end of the second pole piece and a second end which is far away from the tail end of the second pole piece in the extending direction of the extending part, the first end of the first connecting section is positioned at a first side of the second end of the first connecting section in the axial direction of the battery winding core, and the first end of the second connecting section is positioned at a second side of the second end of the second connecting section in the axial direction of the battery winding core.
According to the battery winding core, the first connecting section and the second connecting section are arranged on the exceeding part of the first pole piece, and the directions of currents flowing through the first connecting section and the second connecting section are opposite, so that magnetic fields generated by the first connecting section and the second connecting section can be mutually offset, and the interference of parasitic magnetic fields generated by the part of the first pole piece, from which the second pole piece grows, on a product is reduced.
Preferably, in the battery winding core, the protruding portion is bent and extended back and forth along the winding direction and along the axial direction of the battery winding core.
Preferably, in the battery winding core, the first connection section and the second connection section are both arranged along the axial extension of the battery winding core.
Preferably, in the battery winding core, the first connecting section and the second connecting section are each disposed obliquely from the first end to the second end in a direction away from the end of the second pole piece.
Preferably, in the battery winding core, the first connection section and the second connection section are all in arc-shaped extension.
Preferably, in the battery winding core, the excess portion further includes a third connection section, and two ends of the third connection section are respectively the first connection section and the second connection section.
Preferably, in the battery winding core, the connection part of the third connection section and the first connection section is in arc transition arrangement.
Preferably, in the battery winding core, the connection part of the third connection section and the second connection section is in arc transition arrangement.
Preferably, in the battery winding core, a plurality of first connecting sections and second connecting sections are sequentially arranged at intervals, and any adjacent first connecting sections and second connecting sections are connected through one third connecting section.
Preferably, in the battery winding core, a plurality of first connecting sections are provided, and any adjacent two first connecting sections are connected by one second connecting section.
Preferably, in the battery winding core, the connection part of the first connection section and the second connection section is in arc transition arrangement.
Preferably, in the battery winding core, the number of the first connection sections is equal to the number of the second connection sections.
Preferably, in the battery winding core, the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece.
Preferably, in the battery winding core, the first connection section and the second connection section are symmetrically disposed at both sides of a symmetry axis parallel to an axial direction of the battery winding core.
In order to achieve the above purpose, the invention also provides a battery, comprising the battery winding core.
In order to achieve the above object, the present invention further provides an electronic device including the above battery.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
FIG. 1 is a schematic view of a conventional battery core;
FIG. 2 is a schematic view of the battery core of FIG. 1 after being unwound;
fig. 3 is a schematic structural view of the battery winding core according to the first embodiment of the present invention after being unwound;
fig. 4 is a schematic structural view of a battery winding core according to a second embodiment of the present invention after being unwound.
The invention is described by reference numerals:
reference numerals Name of the name Reference numerals Name of the name
1000 Battery winding core 114 Notch groove
100 First pole piece 115 First end
110 Exceeding part 116 Second end
111 First connecting section 120 Bonding part
112 Second connecting section 200 Second pole piece
113 Third connecting section
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The present invention provides a battery winding core, which can be used in a wound battery, and the following description will take the application of the battery winding core in a wound lithium ion battery as an example, fig. 3 shows a first embodiment of the battery winding core provided by the present invention, and fig. 4 shows a second embodiment of the battery winding core provided by the present invention.
Referring to fig. 3, in a first embodiment, the battery winding core 1000 includes a first pole piece 100 and a second pole piece 200; the first pole piece 100 and the second pole piece 200 are in a laminating winding arrangement, the first pole piece 100 and the second pole piece 200 are respectively provided with an end far from a winding center in a winding direction, and the end of the first pole piece 100 exceeds the end of the second pole piece 200 in the winding direction to form an exceeding part 110.
Specifically, the length of the first pole piece 100 is the dimension of the first pole piece 100 in the winding direction of the battery winding core 1000, the first pole piece 100 has a start end and an end opposite to each other in the winding direction, the start end of the first pole piece 100 is close to the winding center of the battery winding core 1000, the end of the first pole piece 100 is far away from the winding center of the battery winding core 1000, and the distance from the start end of the first pole piece 100 to the end of the first pole piece 100 along the winding direction is the length of the first pole piece 100.
Similarly, the length of the second pole piece 200 is the dimension of the second pole piece 200 in the winding direction of the battery winding core 1000, the second pole piece 200 also has a start end and an end opposite to each other in the winding direction, the start end of the second pole piece 200 is close to the winding center of the battery winding core 1000, the end of the second pole piece 200 is far from the winding center of the battery winding core 1000, and the distance from the start end of the second pole piece 200 to the end of the second pole piece 200 along the winding direction is the length of the second pole piece 200.
Since the length of the first pole piece 100 is greater than the length of the second pole piece 200, the end of the first pole piece 100 can exceed the end of the second pole piece 200 in the winding direction. One of the first pole piece 100 and the second pole piece 200 is a negative pole piece, and the other is a positive pole piece.
The first electrode sheet 100 may be a negative electrode sheet and the second electrode sheet 200 may be a positive electrode sheet, or the first electrode sheet 100 may be a positive electrode sheet and the second electrode sheet 200 may be a negative electrode sheet. In general, the length of the negative electrode sheet is greater than that of the positive electrode sheet, so optionally, referring to fig. 3, in the first embodiment, the first electrode sheet 100 is a negative electrode sheet, and the second electrode sheet 200 is a positive electrode sheet.
The end of the first pole piece 100 exceeds the end of the second pole piece 200, and the portion of the end of the first pole piece 100 exceeding the second pole piece 200 is the exceeding portion 110. Optionally, referring to fig. 3, in the first embodiment, the first pole piece 100 includes an extending portion 110 and a fitting portion 120, where the fitting portion 120 is fitted to the second pole piece 200, and one end of the fitting portion 120 connected to the extending portion 110 is flush with an end of the second pole piece 200 in the winding direction.
During the charge and discharge of the wound battery, the currents in the first and second pole pieces 100 and 200 are the same and opposite in direction. The direction of current in first pole piece 100 may be from the beginning of first pole piece 100 to the end of first pole piece 100, and correspondingly, the direction of current in second pole piece 200 is from the end of second pole piece 200 to the beginning of second pole piece 200; the direction of current in first pole piece 100 may also be from the end of first pole piece 100 to the beginning of first pole piece 100, and correspondingly, the direction of current in second pole piece 200 is from the beginning of second pole piece 200 to the end of second pole piece 200. The following description will take an example in which the direction of the current in the first pole piece 100 flows from the start of the first pole piece 100 to the end of the first pole piece 100, and the direction of the current in the second pole piece 200 flows from the end of the second pole piece 200 to the start of the second pole piece 200.
According to the principle of current opposite magnetic field cancellation, the magnetic fields generated by the bonding portion 120 and the second pole piece 200 can cancel each other, but the magnetic field generated by the exceeding portion 110 cannot cancel the magnetic field generated by the second pole piece 200, so that parasitic magnetic field is generated by the exceeding portion 110.
In order to reduce the interference of the parasitic magnetic field generated by the excess portion 11 on the product, referring to fig. 3, the excess portion 110 includes a first connection section 111 and a second connection section 112, each of the first connection section 111 and the second connection section 112 has a first end 115 near the end of the second pole piece 200 in the extending direction of the excess portion 110, and a second end 116 far from the end of the second pole piece 200, the first end 115 of the first connection section 111 is located at a first side of the second end 116 of the first connection section 111 in the axial direction of the battery winding core 1000, and the first end 115 of the second connection section 112 is located at a second side of the second end 116 of the second connection section 112 in the axial direction of the battery winding core 1000.
Specifically, the first and second sides in the axial direction of the battery core 1000 are opposite sides in the axial direction of the battery core 1000, the axial direction of the battery core 1000 is defined as up-down direction below, the first side in the axial direction of the battery core 1000 is the upper side, and the second side in the axial direction of the battery core 1000 is the lower side.
In the process of charging and discharging the wound battery, the current direction in the excess portion 110 flows from one end of the excess portion 110 connected to the fitting portion 120 to the other end of the excess portion 110 along the extending direction of the excess portion 110, that is, the current direction in the excess portion 110 is the extending direction of the excess portion 110.
The first end 115 of the first connection section 111 is adjacent to the end of the second pole piece 200 in the extending direction of the protruding portion 110, i.e., the first end 115 of the first connection section 111 is adjacent to the end of the attaching portion 120 to which the protruding portion 110 is connected in the extending direction of the protruding portion 110, while the second end 116 of the first connection section 111 is distant from the end of the second pole piece 200 in the extending direction of the protruding portion 110, i.e., the second end 116 of the first connection section 111 is distant from the end of the attaching portion 120 to which the protruding portion 110 is connected in the extending direction of the protruding portion 110, and the first end 115 of the first connection section 111 is located on the upper side of the second end 116 of the first connection section 111. The direction of the current in the first connection section 111 is from the first end 115 of the first connection section 111 to the second end 116 of the first connection section 111, i.e. the current in the first connection section 111 flows from top to bottom.
Likewise, the first end 115 of the second connecting section 112 is close to the end of the second pole piece 200 in the extending direction of the protruding portion 110, i.e., the first end 115 of the second connecting section 112 is connected to the end of the protruding portion 110 close to the attaching portion 120 in the extending direction of the protruding portion 110, while the second end 116 of the second connecting section 112 is far from the end of the second pole piece 200 in the extending direction of the protruding portion 110, i.e., the second end 116 of the second connecting section 112 is connected to the end of the protruding portion 110 far from the attaching portion 120 in the extending direction of the protruding portion 110, and the first end 115 of the second connecting section 112 is located below the second end 116 of the second connecting section 112. The direction of the current in the second connection section 112 is also from the first end 115 of the second connection section 112 to the second end 116 of the second connection section 112, i.e. the current in the second connection section 112 is flowing from bottom to top.
As can be seen from the above, the current direction in the first connection section 111 is opposite to the current direction in the second connection section 112 in the axial direction of the battery winding core 1000. Since the current in the first connection section 111 flows from top to bottom and the current in the second connection section 112 flows from bottom to top, the directions of the currents flowing through the first connection section 111 and the second connection section 112 are opposite, and the magnetic fields generated by the first connection section 111 and the second connection section 112 can cancel each other, so that the interference of the parasitic magnetic field generated by the excess portion 110 on the product is reduced.
The first connection section 111 and the second connection section 112 may each be provided with one or more, and the number of the first connection sections 111 and the number of the second connection sections 112 may be equal or unequal, for example, the number of the first connection sections 111 may be one more than the number of the second connection sections 112; the number of the first connection sections 111 may be one less than the number of the second connection sections 112.
Optionally, referring to fig. 3, in the first embodiment, the first connecting sections 111 and the second connecting sections 112 are arranged in a one-to-one correspondence, that is, the number of the first connecting sections 111 is equal to the number of the second connecting sections 112 and the first connecting sections 111 and the second connecting sections 112 are all arranged in a plurality, and the magnetic fields generated by each first connecting section 111 and the corresponding second connecting section 112 can cancel each other, so that the interference of the parasitic magnetic field generated by the exceeding portion 110 on the product can be greatly reduced.
The reason why the extending portion 110 can form the first connecting section 111 and the second connecting section 112 is that the extending portion 110 is not completely extended along the winding direction, the extending direction of the extending portion 110 is bent several times in the up-down direction with respect to the winding direction, the extending portion 110 is bent once downwards to form the first connecting section 111, and the extending portion 110 is bent once upwards to form the second connecting section 112.
The number of times of bending the exceeding part 110 in the up-down direction may be odd or even, and if the number of times of bending the exceeding part 110 in the up-down direction is odd, the number of times of bending the exceeding part 110 in the down direction may be more than the number of times of bending the exceeding part 110 in the up-down direction, so that the number of the first connecting sections 111 is one more than the number of the second connecting sections 112; the number of times the excess portion 110 is bent downward may be smaller than the number of times the excess portion 110 is bent upward, so that the number of the first connection sections 111 is one less than the number of the second connection sections 112. If the number of times of bending the exceeding portion 110 in the up-down direction is even, the number of times of bending the exceeding portion 110 in the down direction is equal to the number of times of bending the exceeding portion 110 in the up-down direction, so that the number of the first connecting sections 111 is equal to the number of the second connecting sections 112.
Optionally, referring to fig. 3, in the first embodiment, the number of times of bending the protruding portion 110 in the up-down direction is even, and the protruding portion 110 is bent downward first, so that the number of the first connecting sections 111 is equal to the number of the second connecting sections 112, and one end of the protruding portion 110 near the attaching portion 120 is provided with the first connecting sections 111, and one end of the protruding portion 110 far from the attaching portion 120 is provided with the second connecting sections 112. A plurality of first connecting sections 111 and second connecting sections 112 are provided in one-to-one correspondence to be described below as an example.
Alternatively, referring to fig. 3, in the first embodiment, the protruding portion 110 is disposed along the winding direction and extends along the axial direction of the battery winding core 1000 in a back-and-forth bending manner. The protruding portion 110 is not arranged in a straight-laying manner, but is folded back and forth along the winding direction, for example, the protruding portion 110 may be arranged in an S-shape, a square shape, a wave shape, or the like.
According to the battery winding core 1000 disclosed by the invention, the first connecting section 111 and the second connecting section 112 are arranged on the exceeding part 110 of the first pole piece 100, and the magnetic fields generated by the first connecting section 111 and the second connecting section 112 can be mutually offset due to the opposite current directions flowing through the first connecting section 111 and the second connecting section 112, so that the interference of parasitic magnetic fields generated by the part of the first pole piece 100, which is longer than the second pole piece 200, on a product is reduced.
Alternatively, referring to fig. 3, in the first embodiment, the first connection section 111 and the second connection section 112 are symmetrically disposed at both sides of a symmetry axis parallel to the axial direction of the battery winding core 1000.
Specifically, each first connecting section 111 and the corresponding one of the second connecting sections 112 are symmetrically disposed about an axis in an up-down direction, that is, the first end 115 of each first connecting section 111 is flush with the second end 116 of the corresponding one of the second connecting sections 112, the second end 116 of each first connecting section 111 is flush with the first end 115 of the corresponding one of the second connecting sections 112, and the dimensions of each first connecting section 111 and the corresponding one of the second connecting sections 112 in a winding direction are equal. Since each first connection section 111 and the corresponding second connection section 112 are symmetrically disposed, the magnetic fields generated by each first connection section 111 and the corresponding second connection section 112 can be completely offset.
Alternatively, referring to fig. 3, in the first embodiment, the protruding portion 110 is provided with a plurality of notch grooves 114 on two opposite sides of the battery winding core 1000 in the axial direction, and the plurality of notch grooves 114 are arranged along the winding direction to form a plurality of first connection sections 111 and a plurality of second connection sections 112 on the protruding portion 110. By machining a plurality of notch grooves 114 on the upper and lower sides of the excess portion 110 to form a plurality of first connection sections 111 and a plurality of second connection sections 112, and by adjusting the shape of the notch grooves 114, it is possible to machine-shape the excess portion 110 of different shapes, and the machining-shape of such excess portion 110 is relatively simple.
The specific shapes of the first connection section 111 and the second connection section 112 may be set according to the actual situation, and optionally, referring to fig. 3, in the first embodiment, the first connection section 111 and the second connection section 112 are each disposed along the axial direction of the battery winding core 1000.
Specifically, the first connecting section 111 and the second connecting section 112 extend along the vertical direction, the first end 115 and the second end 116 of the first connecting section 111 are respectively an upper end and a lower end of the first connecting section 111, and the first end 115 and the second end 116 of the second connecting section 112 are respectively a lower end and an upper end of the second connecting section 112.
The unwinding direction of the battery core 1000 is defined as a left-right direction, and the starting end and the ending end of the first pole piece 100 are the left end and the right end of the first pole piece 100, respectively, in the case where the battery core 1000 is unwound. The protruding portion 110 further includes a third connection section 113, and the third connection section 113 is disposed to extend along the winding direction. In the case of the battery core 1000 being unwound, the lower end of each second connection section 112 is connected with the lower end of one first connection section 111 located at the left side through one third connection section 113, and the upper end of each second connection section 112 is connected with the upper end of one first connection section 111 located at the right side through one third connection section 113, so that the whole of the excess part 110 is provided in the shape of a square wave.
Alternatively, referring to fig. 4, in the second embodiment, the first connection section 111 and the second connection section 112 are each disposed obliquely from the first end 115 to the second end 116 in a direction away from the end of the second pole piece 200.
Specifically, in the case where the battery core 1000 is unwound, the first connection section 111 is disposed obliquely rightward from top to bottom, and the second connection section 112 is disposed obliquely rightward from bottom to top. The lower end of each second connection section 112 is directly or indirectly connected to the lower end of one first connection section 111 located at the left side, and the upper end of each second connection section 112 is directly or indirectly connected to the upper end of one first connection section 111 located at the right side, so that the whole of the excess portion 110 is arranged in a triangular wave or trapezoidal wave shape or the like.
Alternatively, in other embodiments, the first connection section 111 and the second connection section 112 are each provided in an arc-shaped extension, for example, the whole of the protruding portion 110 is provided in a shape of a complete cosine wave or an truncated cosine wave.
Each first connecting section 111 may be directly or indirectly connected to a corresponding second connecting section 112, and optionally, referring to fig. 3, in the first embodiment, the beyond portion 110 further includes a third connecting section 113, and two ends of the third connecting section 113 are respectively connected to the first connecting section 111 and the second connecting section 112. Each first connecting section 111 is indirectly connected with a corresponding second connecting section 112 through a third connecting section 113.
Further, referring to fig. 3, in the first embodiment, a plurality of first connecting sections 111 and second connecting sections 112 are sequentially arranged at intervals, and any adjacent first connecting section 111 and second connecting section 112 are connected by a third connecting section 113.
Specifically, in the case of unwinding the battery core 1000, the lower end of each second connection section 112 is connected to the lower end of one first connection section 111 located at the left side through one third connection section 113, and the upper end of each second connection section 112 is connected to the upper end of one first connection section 111 located at the right side through one third connection section 113.
The protruding portion 110 may be connected to the attaching portion 120 through a first connecting section 111, the protruding portion 110 may be connected to the attaching portion 120 through a second connecting section 112, and the protruding portion 110 may be connected to the attaching portion 120 through a third connecting section 113. Optionally, referring to fig. 3, in the first embodiment, the protruding portion 110 is connected to the attaching portion 120 through a third connecting section 113.
Alternatively, referring to fig. 4, in the second embodiment, a plurality of first connection sections 111 are provided, and any adjacent two first connection sections 111 are connected by one second connection section 112.
Specifically, each first connection section 111 is directly connected to a corresponding one of the second connection sections 112, the lower end of each second connection section 112 is connected to the lower end of one of the first connection sections 111 located on the left side, and the upper end of each second connection section 112 is connected to the upper end of one of the first connection sections 111 located on the right side.
Alternatively, in other embodiments, the bending portion of the protruding portion 110 is disposed in an arc transition, for example, the bending portion of the protruding portion 110 may be subjected to R-angle treatment.
Specifically, in the case that each first connection section 111 is indirectly connected to a corresponding second connection section 112 through a third connection section 113, the connection between each third connection section 113 and the first connection section 111 is in an arc transition arrangement, and similarly, the connection between each third connection section 113 and the second connection section 112 is in an arc transition arrangement.
In the case that each first connection section 111 is directly connected to a corresponding second connection section 112, the connection between each first connection section 111 and the second connection section 112 is in an arc transition arrangement.
The length of the first pole piece 100 is greater than the length of the second pole piece 200, and the width of the first pole piece 100 and the width of the second pole piece 200 may be equal or unequal, wherein the width of the first pole piece 100 is the dimension of the first pole piece 100 in the axial direction of the battery winding core 1000, and likewise the width of the second pole piece 200 is the dimension of the second pole piece 200 in the axial direction of the battery winding core 1000. In general, since the width of the negative electrode sheet is larger than that of the positive electrode sheet, optionally, referring to fig. 3, in the first embodiment, the width of the first electrode sheet 100 is larger than that of the second electrode sheet 200.
Alternatively, referring to fig. 3, in the first embodiment, the width of the protruding portion 110 is equal to the width of the attaching portion 120.
Battery winding core 1000 also typically includes a separator (not shown in the figures), and battery winding core 1000 is formed by winding first pole piece 100, the separator, and second pole piece 200, and specifically, battery winding core 1000 may be formed by winding first pole piece 100-separator-second pole piece 200-separator in that order through a winding process; the battery winding core 1000 may be formed by winding the second pole piece 200, the separator, the first pole piece 100 and the separator in this order through a winding process.
The invention also provides a battery which can be a wound battery such as a wound lithium ion battery and comprises a battery winding core, and the battery winding core adopts the technical scheme of the embodiment, so that the battery winding core has the beneficial effects brought by the technical scheme of the embodiment.
The invention also provides electronic equipment which can be a wireless earphone and the like, wherein the electronic equipment comprises a battery, and the battery comprises a battery winding core.
The foregoing description of the preferred embodiments of the present invention should not be construed as limiting the scope of the invention, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).

Claims (10)

1. The battery winding core is characterized by comprising a first pole piece and a second pole piece;
the first pole piece and the second pole piece are in fit winding arrangement, the first pole piece and the second pole piece are respectively provided with an end far away from a winding center in a winding direction, and the end of the first pole piece exceeds the end of the second pole piece in the winding direction to form an exceeding part;
the extending part comprises a first connecting section and a second connecting section, the first connecting section and the second connecting section are respectively provided with a first end which is close to the tail end of the second pole piece and a second end which is far away from the tail end of the second pole piece in the extending direction of the extending part, the first end of the first connecting section is positioned at a first side of the second end of the first connecting section in the axial direction of the battery winding core, and the first end of the second connecting section is positioned at a second side of the second end of the second connecting section in the axial direction of the battery winding core.
2. The battery winding core according to claim 1, wherein the protruding portion is provided in a bending and extending manner along the winding direction and along the axial direction of the battery winding core.
3. The battery cell as recited in claim 1, wherein the first connection section and the second connection section are each disposed in an axial extension of the battery cell; or alternatively, the process may be performed,
the first connecting section and the second connecting section are obliquely arranged from the first end to the second end towards the direction away from the tail end of the second pole piece; or alternatively, the process may be performed,
the first connecting section and the second connecting section are in arc extension.
4. A battery winding core according to any one of claims 1-3, wherein the excess portion further comprises a third connecting section, both ends of the third connecting section being provided with the first connecting section and the second connecting section, respectively.
5. The battery core as in claim 4, wherein the junction of the third connection section and the first connection section is in an arcuate transition; and/or the number of the groups of groups,
the joint of the third connecting section and the second connecting section is in arc transition; and/or the number of the groups of groups,
the first connecting section and the second connecting section are sequentially arranged at intervals, and any adjacent first connecting section and second connecting section are connected through one third connecting section.
6. A battery winding core according to any one of claims 1-3, wherein a plurality of said first connection sections are provided, any adjacent two of said first connection sections being connected by one of said second connection sections.
7. The battery core of claim 6, wherein the junction of the first connection section and the second connection section is in an arcuate transition arrangement.
8. A battery winding core according to any one of claims 1-3, wherein the number of said first connection sections and said second connection sections is equal; and/or the number of the groups of groups,
the first pole piece is a negative pole piece, and the second pole piece is a positive pole piece; and/or the number of the groups of groups,
the first connecting section and the second connecting section are symmetrically arranged on two sides of a symmetry axis parallel to the axial direction of the battery winding core.
9. A battery comprising a battery winding as claimed in any one of claims 1 to 8.
10. An electronic device comprising the battery of claim 9.
CN202310499943.2A 2023-05-05 2023-05-05 Battery winding core, battery and electronic equipment Pending CN116470156A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310499943.2A CN116470156A (en) 2023-05-05 2023-05-05 Battery winding core, battery and electronic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310499943.2A CN116470156A (en) 2023-05-05 2023-05-05 Battery winding core, battery and electronic equipment

Publications (1)

Publication Number Publication Date
CN116470156A true CN116470156A (en) 2023-07-21

Family

ID=87173540

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310499943.2A Pending CN116470156A (en) 2023-05-05 2023-05-05 Battery winding core, battery and electronic equipment

Country Status (1)

Country Link
CN (1) CN116470156A (en)

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