CN217691453U

CN217691453U - Winding structure for battery, battery and earphone with battery

Info

Publication number: CN217691453U
Application number: CN202221037555.XU
Authority: CN
Inventors: 唐锐
Original assignee: Anker Innovations Co Ltd
Current assignee: Anker Innovations Co Ltd
Priority date: 2022-04-27
Filing date: 2022-04-27
Publication date: 2022-10-28
Anticipated expiration: 2032-04-27

Abstract

The utility model discloses a headset that is used for winding structure, battery of battery and has it. The winding structure comprises a positive plate and a negative plate. The positive electrode tab is wound in a first direction about a winding axis of the winding structure, and is electrically connected with the positive electrode tab. The negative electrode sheet is stacked with the positive electrode sheet and wound together with the positive electrode sheet in a first direction about a winding axis, and a negative electrode tab is electrically connected to an end portion of the negative electrode sheet. The length of the negative plate is greater than that of the positive plate. The negative electrode sheet includes a rewinding section that winds in a second direction opposite to the first direction such that an end of the positive electrode sheet located outside the winding structure is aligned with an end of the negative electrode sheet located outside the winding structure in a radial direction with respect to the winding axis. Thus, leakage of magnetic field to the outside can be prevented in the conventional battery winding structure.

Description

Winding structure for battery, battery and earphone with battery

Technical Field

The utility model relates to an electrochemistry technical field, concretely relates to a winding structure for battery still relates to the battery that has this winding structure to and the earphone that has this battery.

Background

For electronic products such as TWS (True Wireless Stereo) headsets, rechargeable lithium ion batteries are often used as power supply devices for portability and endurance. Because the overall dimension of the product is limited, the lithium ion battery can only be stacked together with a mainboard, a loudspeaker and the like in the product, and the lithium ion battery is approximately in a 'hamburger type' layout.

However, the small lithium ion battery commonly used at present has a possibility of magnetic field leakage, and the leaked alternating magnetic field may have an adverse effect on the adjacent horn coil and the like. For example, when the TWS headset performs bluetooth mode switching or frequency modulation switching, the alternating magnetic field generated thereby causes the speaker coil to form an excitation magnetic field and further generates induced electromotive force, which causes the speaker diaphragm to vibrate undesirably, thereby forming noise floor audible to human ears, which may affect the hearing of the headset.

Therefore, in view of the above-mentioned current situation, there is a need to provide a winding structure for a battery, a battery and a headset having the same to at least partially solve the problems therein.

SUMMERY OF THE UTILITY MODEL

In the summary section a series of concepts in a simplified form is introduced, which will be described in further detail in the detailed description section. The inventive content does not imply any attempt to define the essential features and essential features of the claimed solution, nor is it implied to be intended to define the scope of the claimed solution.

To solve the above problem at least in part, a first aspect of the present invention provides a winding structure for a battery, including:

a positive electrode tab wound in a first direction about a winding axis of the winding structure and electrically connected with a positive electrode tab;

a negative electrode sheet stacked on the positive electrode sheet and wound together with the positive electrode sheet in the first direction about the winding axis, and a negative electrode tab electrically connected to an end of the negative electrode sheet;

wherein the length of the negative electrode sheet is greater than that of the positive electrode sheet, and

the negative electrode sheet includes a wound section wound in a second direction opposite to the first direction such that one end of the positive electrode sheet is aligned with the end of the negative electrode sheet in a radial direction with respect to the winding axis.

According to this scheme, can offset the magnetic field of the coiling structure external radiation of traditional battery, consequently according to the utility model discloses a magnetic field leakage to the outside has been avoided to a coiling structure for battery. In this case, it is possible to arrange the battery having such a winding structure according to the present invention at any desired position without considering the influence of the risk of magnetic field leakage on surrounding electronic components.

In a preferred embodiment of the present invention, the positive tab and the negative tab are arranged to be aligned in a radial direction about the winding axis.

According to the scheme, the lengths of the parts of the currents flowing through the positive plate and the negative plate are equal, so that the magnetic fields generated by the positive plate and the negative plate form differential magnetic fields with the same amplitude and opposite phases to be mutually offset, and the leakage of the external magnetic field is avoided.

In a preferred embodiment of the present invention, the end portion of the positive electrode sheet and the end portion of the negative electrode sheet overlap in a circumferential direction of the winding structure.

According to this aspect, it is possible to conveniently arrange the end portion of the positive electrode sheet and the end portion of the negative electrode sheet while avoiding leakage of the magnetic field of the winding structure for the battery to the outside.

In a preferred embodiment of the present invention, the end of the positive electrode sheet and the end of the negative electrode sheet are spaced apart by 180 degrees in the circumferential direction of the winding structure.

In a preferred embodiment of the present invention, the length of the rewinding section of the negative electrode sheet is equal to or less than half of the circumference of the winding structure.

According to the scheme, complete cancellation of the magnetic field can be facilitated, so that the magnetic field leakage risk is avoided.

In a preferred embodiment of the present invention, the winding structure further includes a casing, the casing accommodates the positive plate and the negative plate, and the positive plate and the negative plate are electrically connected to the casing through the positive tab and the negative tab, respectively;

the rewinding section of the negative plate is arranged on the circumferential side surface or one end surface of the shell.

According to this aspect, the rewinding section of the negative electrode tab can be conveniently arranged while avoiding leakage of the magnetic field from the winding structure for the battery to the outside.

In a preferred embodiment of the present invention, the material of the rewinding section of the negative electrode sheet includes nickel.

According to this aspect, it is possible to provide a winding structure for a battery with appropriate conductivity, thereby improving the charge and discharge efficiency of the battery.

In a preferred embodiment of the present invention, another rewinding section is provided on an end of the positive electrode sheet on a side where the winding structure starts to wind, so that an outer side end of the other rewinding section is aligned with an end of the negative electrode sheet on the side where the winding structure starts to wind; or,

and the end part of the negative electrode sheet on the side where the winding structure starts to wind is provided with another rewinding section, so that the outer end part of the other rewinding section is aligned with the end part of the positive electrode sheet on the side where the winding structure starts to wind.

According to the scheme, the mode of arranging another rewinding section can be adopted before winding for the corresponding end parts of the positive plate and the negative plate on the side where the winding structure starts to wind, so that the corresponding end parts of the positive plate and the negative plate on the side where the winding structure starts to wind are ensured to be aligned, the starting end part of the winding structure located in the center is smooth and cannot scrape or rub the positive plate on the winding starting end part, and the magnetic field leakage risk caused by the fact that the starting end parts of the positive plate and the negative plate are not aligned can be avoided.

A second aspect of the present invention provides a battery comprising a winding structure according to the aforementioned first aspect.

According to this aspect, a battery in which the risk of magnetic field leakage is eliminated can be provided. In this case, it is possible to arrange the battery having such a winding structure according to the present invention at any desired position without considering the influence of the risk of magnetic field leakage on surrounding electronic components.

A third aspect of the present invention provides an earphone, comprising: a speaker and the battery of the second aspect, wherein the speaker and the battery are stacked and the minimum distance therebetween is equal to or less than 2mm.

According to this scheme, can make and be according to the utility model discloses an earphone has less size to promote into ear comfort level, improve the portability. On the other hand, owing to avoided the magnetic field leakage of traditional battery, according to the utility model discloses a bottom of earphone is made an uproar and is reduced by a wide margin, and this can improve acoustic signal transmission's the degree of accuracy and efficiency. Therefore, according to the utility model discloses an earphone can improve user experience from wearing comfort level and hearing two-way at least.

Drawings

The following figures of the embodiments of the present invention are used herein as part of the present invention for understanding the present invention. There are shown in the drawings embodiments of the present invention and the description thereof for the purpose of illustrating the principles of the invention. In the drawings, there is shown in the drawings,

fig. 1 is a schematic top perspective view of a battery according to an embodiment of the present invention;

fig. 2 is a schematic top perspective view of another perspective of the battery of fig. 1;

FIG. 3 is a schematic bottom perspective view of the battery of FIG. 1;

fig. 4 is a schematic top view of the battery of fig. 1;

fig. 5 is a schematic side view of the battery of fig. 1;

fig. 6 is a schematic view of a winding structure for a battery according to an embodiment of the present invention;

FIG. 7 is an equivalent circuit schematic of the winding structure of FIG. 6;

fig. 8 is a schematic view of a prior art winding structure for a battery;

fig. 9 is a schematic top view of a battery according to a variation of the present invention, from the same perspective as fig. 4;

fig. 10 is a schematic top view of a battery according to a variation of the present invention, from the same perspective as fig. 4;

fig. 11 is a schematic top view of a battery according to a variant of the invention, from the same perspective as fig. 4;

fig. 12 is a schematic top view of a battery according to a variation of the present invention from the same perspective as fig. 4.

Description of the reference numerals:

10: the battery 12: shell body

14: the winding structure 16: positive plate

18: positive electrode tab 20: diaphragm

22: negative electrode tab 23: rewinding section

231: inner end 232: outer end

24: negative electrode tab

Detailed Description

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art, that embodiments of the present invention may be practiced without one or more of these specific details. In other instances, well-known features have not been described in order to avoid obscuring embodiments of the present invention.

In the following description, a detailed structure will be presented for a thorough understanding of embodiments of the invention. It is apparent that the implementation of the embodiments of the present invention is not limited to the specific details familiar to those skilled in the art.

The present invention provides in a first aspect a winding arrangement 14 for a battery 10 that can be effectively improved against the drawbacks of the prior art that magnetic leakage may occur in winding arrangements such as lithium ion batteries, thereby solving the secondary problem caused by magnetic leakage of the battery.

In the embodiment of the present invention, the winding structure 14 for the battery 10 is described by taking the button battery 10 as an example, but in the case of no conflict, the winding structure 14 for the battery 10 according to the present invention can be used for batteries of other forms such as a needle battery, a cylindrical battery, a rectangular battery, and a pouch battery, without departing from the scope of the present invention.

Referring first to the perspective views of fig. 1-3, where fig. 2 is rotated 180 degrees about its central axis relative to the perspective of fig. 1, and fig. 3 is inverted 180 degrees upward relative to the perspective views of fig. 1 and 2, it can be seen that the housing 12 of the battery 10 and the tabs (e.g., positive tab 18, negative tab 22) electrically connected to the housing 12. The case 12 has a substantially cylindrical or inverted truncated cone shape, and a part of the tabs (e.g., the positive tab 18 and the negative tab 22) is disposed on the outer surface of the case 12. The battery core wound spirally layer by layer from the center to the outside inside the casing 12 is not shown in the drawings, but as known in the art, taking the present invention as an example, as shown in fig. 5 and fig. 6, the positive electrode sheet 16 and the negative electrode sheet 22 in the battery core are separated by the separator 20, and the positive electrode sheet 16, the separator 20 and the negative electrode sheet 22 are sequentially stacked from the same end portion, toward the direction wrapping the positive electrode sheet 16, and are wound in the same direction around the winding axis AX (see fig. 5) to form a planar spiral shape, and the description of the winding structure inside the battery is omitted here.

In this winding manner, the length of the negative electrode tab 22 is always greater than the length of the positive electrode tab 16, so that the positive electrode tab 16 can be covered on the outside during winding. However, since the negative electrode tab 22 and the positive electrode tab 16 cannot be completely overlapped, for example, referring to a schematic diagram of a prior art battery winding structure shown in fig. 8, a portion of the negative electrode tab 22 'exceeding the positive electrode tab 16' in length may form a strong magnetic field due to alternating current therein. Referring to the equivalent circuit diagram of fig. 7 in combination, the straight arrows A1, A2 indicate the directions of the currents in the positive and negative electrode tabs 16', 22', respectively, and the curved arrows R1, R2 indicate the directions of the magnetic fields formed due to the currents in the positive and negative electrode tabs 16', 22', respectively. Thus, the magnetic field of the portion of the negative electrode tab 22 'that exceeds the positive electrode tab 16' in length interferes with the external radiation. For example, when a speaker is disposed near a battery, a coil of the speaker generates an excitation magnetic field due to an interference magnetic field of the battery, and further generates an induced electromotive force, so that a diaphragm of the speaker generates undesired vibration to form audible noise.

According to the utility model discloses, can weaken or eliminate above-mentioned unexpected interference magnetic field through the improvement to winding structure under the condition that does not change current pole piece length.

Referring now to fig. 4 showing one end surface of the case 12 of the battery 10 and fig. 6 showing an equivalent structural schematic inside the case 12, the winding structure 14 for the battery 10 of the present invention includes a positive electrode sheet 16 and a negative electrode sheet 22, wherein both end portions of the positive electrode sheet 16 and both end portions of the negative electrode sheet 22 may be respectively flush (the negative electrode sheet 22 is not completely shown). The positive electrode tab 16 is wound in a first direction (not shown) about a winding axis AX (see fig. 5) of the winding structure 14. The positive tab 16 is electrically connected to the positive tab 18. Positive tab 18 is a metal conductor that serves as a contact for leading out positive tab 16 during charging and discharging of battery 10. The negative electrode tab 22 is stacked on the positive electrode tab 16, and is wound together with the positive electrode tab 16 in a first direction about the winding axis AX. The negative tab 24 is electrically connected to an end portion (right end portion in fig. 6) of the negative electrode tab 22. Negative tab 24 is a metal conductor that serves as a contact for drawing negative tab 22 during charging and discharging of battery 10. The length of the negative electrode tab 22 is greater than the length of the positive electrode tab 16. Unlike the prior art, the negative electrode tab 22 includes the rewinding section 23 extending from 231 to 232 in fig. 4, and the rewinding section 23 is wound in a second direction opposite to the first direction so that the end of the positive electrode tab 16 is aligned with the end of the negative electrode tab 22 in a radial direction about the winding axis AX. Here, "aligned" in the radial direction means that the end of the positive electrode sheet 16 and the end of the negative electrode sheet 22 coincide, flush, in the circumferential direction of the wound structure 14; or the end of the positive electrode tab 16 and the end of the negative electrode tab 22 are spaced 180 degrees apart in the circumferential direction of the winding structure 14, opposite each other, as described in more detail below.

For example, in fig. 4 showing a top view of a winding structure 14 for a battery 10 according to the present invention, the second direction is clockwise in the drawing. That is, the reverse winding section 23 of the negative electrode tab 22 is wound in the clockwise direction in fig. 4. It is understood that the rewinding section 23 has an inner end 231 continuous with the rest of the negative electrode tab 22 and a free outer end 232, and the rewinding section 23 is arranged to be disposed in the second direction from its inner end 231 to its outer end 232. Compared with the prior art in which the negative electrode sheet does not have a portion rewinding along a second direction opposite to the first direction (counterclockwise direction in the figure), the negative electrode sheet 22 is rewound beyond the portion of the positive electrode sheet 16 in length in the present invention, so that not only the respective ends of the positive electrode sheet 16 and the negative electrode sheet 22 starting to be wound can be aligned (i.e., the two ends are flush), but also the respective ends of the positive electrode sheet 16 and the negative electrode sheet 22 ending to be wound can be aligned. Here, the respective end portions of the positive and

negative electrode tabs

16 and 22 that end up being wound are aligned in the radial direction about the winding axis AX means that the inside end portion 231 of the rewinding section 23 on the negative electrode tab 22 is aligned with the end portion of the positive electrode tab 16 that ends up being wound in the radial direction about the winding axis AX.

Accordingly, in a preferred embodiment of the present invention, positive tab 18 and negative tab 24 are arranged to be aligned in a radial direction about winding axis AX. Specifically, for example, the positive electrode tab 18 is disposed at the end of the positive electrode tab 16 that ends winding, and the negative electrode tab 24 is disposed at the end of the negative electrode tab 22 that ends winding (see fig. 4, at the inside end 231 of the rewinding section 23). Because the respective end portions of the positive and

negative tabs

16 and 22 that end up being wound are aligned, the positive and

negative tabs

18 and 24 are also aligned. In the embodiment of fig. 4, positive electrode tab 18 is opposite negative electrode tab 24 about a winding axis AX (see fig. 5).

In contrast, as shown in the schematic diagram of fig. 6 illustrating the equivalent structure of the winding structure 14, the end of the positive electrode sheet 16 and the end of the negative electrode sheet 22 are aligned in the radial direction, so that the lengths of the parts of the flowing currents of the positive electrode sheet 16 and the negative electrode sheet 22 are equal, and therefore, even if the alternating electric field indicated by the direction in fig. 7 and the magnetic field are generated by both the positive electrode sheet 16 and the negative electrode sheet 22, the magnetic fields of the two will form the differential magnetic fields with the same amplitude and opposite phases to cancel each other, and therefore, the winding structure 14 for the battery 10 according to the present invention will not leak the magnetic field to the outside. In this case, the battery 10 with such a winding structure 14 according to the present invention can be arranged in any desired position without taking into account the influence of the risk of magnetic field leakage on surrounding electronic components.

A preferred embodiment of the present invention has been described. In a modification according to the present invention, the end of the positive electrode sheet 16 that starts to be wound may also exceed the end of the negative electrode sheet 22 that starts to be wound, in which case by providing the rewinding section 23 of the negative electrode sheet 22, the current in the rewinding section 23 can be made to be opposite to the current in the portion of the positive electrode sheet 16 that exceeds the negative electrode sheet 22 on the side of the end that starts to be wound, so that the magnetic fields caused by the alternating electric fields of the two can also cancel each other out, thereby avoiding the magnetic field leakage that may occur.

In the embodiment shown in fig. 5, the rewinding section 23 of the negative electrode tab 22 is disposed at one end face of the case 12. In other implementations, the rewind section 23 may also be arranged on the circumferential side of the housing 12. In the embodiment shown in fig. 5, the reverse wound section 23 of the negative electrode sheet 22 is reversely wound in a substantially annular shape. It should be noted that the arrangement of the rewinding sections 23 is not limited to a circular shape. In fact, as long as the equivalent circuit of the winding structure 14 is consistent with that shown in fig. 6, that is, the positive and

negative electrode sheets

16 and 22 can generate the differential magnetic fields which cancel each other out, other arrangements of the rewinding sections 23 are possible in the embodiments according to the present invention.

In one embodiment, the end of the positive electrode tab 16 that ends up being wound (not shown) overlaps the end of the negative electrode tab 22 that ends up being wound (at 231) in the circumferential direction of the wound structure 14 about the winding axis AX so that the end of the positive electrode tab 16 is aligned with the end of the negative electrode tab 22 in the radial direction about the winding axis AX. In other words, the inside end 231 of the rewinding section 23 of the negative electrode tab 22 overlaps the corresponding end of the positive electrode tab 16 in the circumferential direction of the winding structure 14 about the winding axis AX.

In an alternative embodiment, the end of the positive electrode sheet 16 that ends up being wound (not shown) is spaced 180 degrees from the end of the negative electrode sheet 22 that ends up being wound (at 231) in the circumferential direction of the wound structure 14 about the winding axis AX, so that the end of the positive electrode sheet 16 and the end of the negative electrode sheet 22 are aligned in the radial direction of the wound structure 14 about the winding axis AX. In other words, the inside end 231 of the rewinding section 23 of the negative electrode tab 22 is 180 degrees apart from the corresponding end of the positive electrode tab 16 in the circumferential direction of the winding structure 14 about the winding axis AX.

As described above, since the magnetic fields of the positive electrode tab 16 and the negative electrode tab 22 can always cancel each other out, the winding structure 14 for the battery 10 according to the present invention does not suffer from magnetic field leakage.

Fig. 9 to 12 show respectively possible different arrangements of the positive and

negative tabs

18, 24 and the rewinding section 23 of the battery 10 in a variant according to the invention. Referring first to fig. 9, the length of the rewind section 23 shown in fig. 9 is less than that shown in fig. 4, i.e., the length extending between the inboard end 231 and the outboard end 232 is shortened. Further, the positions of the positive tab 18 and the negative tab 24 may be adapted to the position of the outer end 232 of the rewinding section 23 of the negative tab 22. For example, as shown in fig. 10, the negative tab 24 may be positioned at a position rotated by about 90 degrees in a counterclockwise direction with respect to fig. 9 to connect with the rewinding section 23 of the negative tab 22.

With continued reference to fig. 11, the length of the rewind section 23 shown in fig. 11 is less than the length shown in fig. 9, and further less than the length shown in fig. 4, i.e., the extension between the inboard end 231 and the outboard end 232 is shortened. Similarly, as shown in fig. 12, the position of the negative tab 24 may be adapted to the position of the outer end 232 of the rewinding section 23 of the negative electrode tab 22, i.e., disposed at a position rotated by about 90 degrees in the clockwise direction with respect to fig. 11, to be connected to the rewinding section 23 of the negative electrode tab 22. It should be understood that in the above cases shown in fig. 9 to 12, the ends of the positive electrode tab 16 and the negative electrode tab 22 on the side of the winding structure 14 where winding starts may not be flush, so as to counteract the undesired leakage magnetic field by providing another rewinding section as described above. Specifically, the end of the positive electrode sheet 16 on the side where the winding structure 14 starts to wind is provided with another rewinding section such that the outside end of the other rewinding section is aligned with the end of the negative electrode sheet 22 on the side where the winding structure 14 starts to wind; alternatively, the end of the negative electrode sheet 22 on the side where the winding structure 14 starts to wind is provided with another rewinding section such that the outside end of the other rewinding section is aligned with the end of the positive electrode sheet 16 on the side where the winding structure 14 starts to wind. Therefore, for the corresponding end portions of the positive electrode sheet 16 and the negative electrode sheet 22 on the side where the winding structure 14 starts to wind, another rewinding section can be arranged before winding, so that the corresponding end portions of the positive electrode sheet 16 and the negative electrode sheet 22 on the side where the winding structure 14 starts to wind are ensured to be aligned, the starting end portion of the winding structure 14 located at the center thereof is smooth and cannot scratch or rub the positive electrode sheet 16 at the winding starting end portion, and the risk of magnetic field leakage caused by the fact that the starting end portions of the positive electrode sheet 16 and the negative electrode sheet 22 are not aligned can be avoided. As shown in the above arrangement, the arrangement of the further rewind section and the positive and

negative tabs

18, 24 may be adjusted according to actual needs, which better illustrate the various possible implementations of the battery 10 according to the present invention.

In a preferred embodiment, the length of the rewinding section 23 of the negative electrode sheet 22 is equal to or less than half the circumference of the winding structure 14. In other words, the length of the negative electrode tab 22 is no longer than the positive electrode tab 16 by more than a "half turn" of the wound structure 14, which facilitates complete cancellation of the magnetic field to avoid the risk of magnetic field leakage. In a preferred embodiment, the material of the rewinding section 23 of the negative electrode tab 22 comprises nickel. This may provide suitable electrical conductivity to the wound structure 14 for the battery 10, thereby improving the charge and discharge efficiency of the battery 10. In a preferred embodiment, the length of positive tab 18 is equal to the length of negative tab 24. This does not affect the corresponding electrical connection of positive and

negative electrode tabs

18, 24 when they are in contact with housing 12, and avoids complications in manufacturing.

The above describes the improvement of the winding structure 14 for the battery 10 according to the present invention in the rewinding section 23 and the like. According to a second aspect of the present invention, a battery 10 comprising the aforementioned winding structure 14 is also proposed. A battery 10 according to the present invention is shown in fig. 1 to 5. It should be noted that these drawings are only schematic illustrations of the arrangement positions of the rewinding section 23, the positive electrode tab 18, the negative electrode tab 22, and the like in the winding structure 14 of the battery 10, and do not represent the final form of the battery 10. For example, the positive tab 18 or the negative tab 22 protruding from the housing 12 of the battery 10 in fig. 1 and 2 may be bent to be parallel to the end face of the housing 12 or received in a groove in the end face of the housing 12 during subsequent processing. As understood by those skilled in the art, the housing 12 of the battery 10 is at least partially provided with an insulating material to provide a suitable electrical connection without causing a short circuit.

According to this aspect, it is possible to provide the battery 10 in which the risk of magnetic field leakage is eliminated.

According to a third aspect of the present invention, a headset, for example a TWS headset, is also proposed comprising such a battery 10 having the aforementioned winding structure 14. With this battery 10, the characteristic of the risk of magnetic field leakage can be eliminated. According to the utility model discloses an earphone can be with battery 10 more compact with other electronic components arrangement ground. For example, in the earphone of the prior art, the conventional battery needs to be spaced at least 2mm from the speaker to avoid problems such as noise floor caused by magnetic field leakage. In the earphone according to the present invention, the bottom noise problem is solved due to the winding structure 14, so that the minimum distance between the battery 10 and the stacked speakers can be reduced to 0.1mm, which significantly reduces the space occupied by the battery 10 inside the earphone. Thus, the earphone according to the present invention can have a smaller size due to the improvement of the winding structure 14 of the battery 10 to improve the in-ear comfort and the portability.

On the other hand, owing to avoided the magnetic field leakage of traditional battery, according to the utility model discloses a bottom noise of earphone is reduced by a wide margin, and this accuracy and the efficiency that can improve acoustic signal transmission are obviously especially important to the earphone. Therefore, according to the utility model discloses an earphone has improved user experience from wearing comfort level and listening sense two aspects at least.

Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Terms such as "disposed" and the like, as used herein, may refer to one element being directly attached to another element or one element being attached to another element through intervening elements. Features described herein in one embodiment may be applied to another embodiment, either alone or in combination with other features, unless the feature is not applicable or otherwise stated in the other embodiment.

The present invention has been described in terms of the above embodiments, but it is to be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the described embodiments. It will be appreciated by those skilled in the art that many more modifications and variations are possible in light of the above teaching and are intended to be included within the scope of the invention.

Claims

1. A winding structure for a battery, comprising:

a positive electrode sheet wound in a first direction about a winding axis of the winding structure and electrically connected with a positive electrode tab;

2. The winding structure according to claim 1,

the positive and negative tabs are arranged to be aligned in a radial direction about the winding axis.

3. The winding structure according to claim 1 or 2,

the end portion of the positive electrode sheet and the end portion of the negative electrode sheet overlap in a circumferential direction of the winding structure.

4. The winding structure according to claim 1 or 2,

the end portion of the positive electrode tab and the end portion of the negative electrode tab are spaced 180 degrees apart in the circumferential direction of the winding structure.

5. The winding structure according to claim 1 or 2,

the length of the rewinding section of the negative electrode sheet is equal to or less than half of the circumference of the winding structure.

6. The winding structure according to claim 1 or 2, further comprising a case that houses the positive electrode tab and the negative electrode tab, the positive electrode tab and the negative electrode tab being electrically connected to the case through the positive electrode tab and the negative electrode tab, respectively;

7. The winding structure according to claim 1,

the material of the rewinding section of the negative electrode sheet comprises nickel.

8. The winding structure according to claim 1 or 2,

the end of the positive electrode sheet on the side where the winding structure starts to wind is provided with another rewinding section, so that the outer end of the other rewinding section is aligned with the end of the negative electrode sheet on the side where the winding structure starts to wind; or,

and the end part of the negative electrode sheet on the side where the winding structure starts to wind is provided with another rewinding section, so that the outer side end part of the other rewinding section is aligned with the end part of the positive electrode sheet on the side where the winding structure starts to wind.

9. A battery comprising the wound structure according to any one of claims 1 to 8.

10. An earphone, comprising:

a speaker; and

the battery pack as set forth in claim 9,

wherein the speaker and the battery are stacked and a minimum distance therebetween is equal to or less than 2mm.