Battery and electronic equipment

Abstract

A battery and an electronic device are disclosed, a cell of the battery comprises a shell, a roll core, a positive tab and a negative tab, the roll core is arranged inside the shell and is formed by winding a negative pole piece, a diaphragm and a positive pole piece; along the circumferential direction of the roll core, the positive pole lug and the positive pole piece are electrically connected to a first position, and the negative pole lug and the negative pole piece are electrically connected to a second position; wherein the winding tail end of the positive pole piece exceeds the winding tail end of the negative pole piece, and the first position is located at any position, exceeding the winding tail end of the negative pole piece, of the positive pole piece; the part between the second position and the first position of the positive pole piece is a positive pole extension section, at least the inner surface of the positive pole extension section is passivated, and the inner surface is the surface, facing one side of the negative pole piece, of the positive pole extension section. Through the arrangement, the winding core background magnetic field can be reasonably controlled, the influence of an eddy current magnetic field is effectively reduced, and meanwhile safety risks can be avoided.

Description

Battery and electronic equipment

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on September 12, 2023, with application number 202322482921.3 and invention name “A Battery and Electronic Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the field of electronic technology, and in particular to a battery and an electronic device. Background Art

[0003] True wireless earphones (TWS) are rapidly developing and being used due to their compact size, portability, and freedom from wire constraints. TWS earphone batteries are primarily powered by button-type lithium batteries, and their cell structure is mostly assembled using a "winding" process, where the cells are wound in the order of negative electrode sheet, separator, positive electrode sheet, and finally separator to form a spiral core structure. During the charge and discharge process of a wound battery, current flows along the cylindrically wound electrode sheet, forming eddy currents. Based on the principle of electromagnetic induction, the changes in current generate a magnetic field.

[0004] In a wound battery cell, the currents in the positive and negative pole pieces are equal in magnitude and opposite in direction, which can offset the induced magnetic field to a certain extent. However, for safety reasons, the negative pole piece is often longer and wider than the positive pole piece in battery structural design. Furthermore, there is a difference in magnetic permeability between the positive and negative pole pieces. Therefore, eddy current magnetic fields are inevitably generated during the operation of the wound battery cell. This eddy current magnetic field couples with the magnetic field of the headphone coil, generating noise, which directly affects the product sound quality and user experience.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a battery and electronic device that can reduce the background magnetic field of the winding core generated by the difference between the positive and negative pole pieces, effectively reduce interference with load devices, and improve the user experience.

[0007] A first aspect of an embodiment of the present application provides a battery, wherein the battery cell includes a shell, a winding core, a positive electrode tab and a negative electrode tab, the winding core is arranged inside the shell and is formed by winding a negative electrode sheet, a separator and a positive electrode sheet; along the circumference of the winding core, the positive electrode tab is electrically connected to the positive electrode sheet at a first position, and the negative electrode tab is electrically connected to the negative electrode sheet at a second position; wherein the length of the positive electrode sheet is greater than the length of the negative electrode sheet, and the winding end of the positive electrode sheet exceeds the winding end of the negative electrode sheet, and the first position is located at any position where the positive electrode sheet exceeds the winding end of the negative electrode sheet, that is, the positive electrode tab is electrically connected to the positive electrode sheet that exceeds the winding end of the negative electrode sheet; the portion of the positive electrode sheet wound from the second position to the first position is a positive extension section, wherein at least the inner surface of the positive extension section is passivated, and the inner surface here is the surface of the positive electrode sheet facing the negative electrode sheet. With such a configuration, the present application solution, through the structural adjustment of the length of the positive pole piece, will generate an eddy current magnetic field based on the working current of the positive extension section to offset the eddy current magnetic field generated by the negative pole, which can reasonably control the background magnetic field of the winding core, effectively reduce the impact of the eddy current magnetic field, and provide a technical guarantee for improving user experience. At the same time, the "passivation treatment" here is used to avoid or reduce the migration flow of lithium ions between the positive extension section of the positive pole piece and the inner negative pole piece, and avoid safety risks by controlling the migration flow of lithium ions in the extension section. In addition, compared with the previous methods of adding a compensation circuit, reducing the connection power or setting a magnetic isolation material, the structural implementation of this solution is simplified, and the manufacturing and assembly tolerance requirements are also reduced. The overall implementation cost is low and does not affect the actual user experience. In addition, under the same capacity and endurance requirements, the battery size can be reasonably reduced based on the architecture of this solution, and it can be widely used in the architectural design of lightweight products.

[0008] In practical applications, the above-mentioned passivation treatment implementation methods can be implemented only on the inner surface of the positive electrode extension section, or on the surfaces on both sides of the positive electrode extension section L, so as to reduce the process implementation cost.

[0009] For example, the passivation treatment is performed so that the surface of the substrate of the positive electrode extension section is not coated with the positive electrode material. Therefore, while increasing the positive electrode extension section, the increase in battery size can be effectively controlled, which is conducive to improving battery life.

[0010] The passivation treatment can be an insulating layer coated on the surface of the substrate of the positive electrode extension section, or a barrier material layer coated on the surface of the substrate of the positive electrode extension section. Therefore, the passivation treatment can be completed by direct coating, which is a relatively simple process.

[0011] In other exemplary embodiments, the passivation treatment method may be to make the density of the positive electrode material in the positive electrode extension section lower than the density of the negative electrode material in the negative electrode sheet; or, the passivation treatment method may be to make the thickness of the positive electrode material in the positive electrode extension section lower than the thickness of the positive electrode material in other areas of the positive electrode sheet. Furthermore, an insulating layer may be coated on the outer surface of the positive electrode material in the positive electrode extension section.

[0012] Based on the first aspect, the present application also provides a first implementation of the first aspect: the outer surface of the positive electrode extension section is covered with an insulating layer or a separator, thereby ensuring physical insulation between the positive electrode sheet and the outer shell.

[0013] Based on the first aspect, or the first embodiment of the first aspect, the present application also provides a second embodiment of the first aspect: the positive extension of the positive electrode sheet forms a winding angle of 270° to 300°. In other words, the welding position between the positive electrode tab and the positive electrode sheet can be wound 270° to 300° further than the welding position between the negative electrode tab and the negative electrode sheet. This arrangement can more stably and reliably offset the magnetic field of the winding core.

[0014] Based on the first aspect, or the first embodiment of the first aspect, or the second embodiment of the first aspect, the present application also provides a third embodiment of the first aspect: the positive and negative tabs are both axially arranged, and the positive tab extends axially from the first opening of the housing to form the positive lead of the battery; the negative tab extends axially from the second opening of the housing to form the negative lead of the battery. Thus, with the axially extending positive and negative tabs, the current directions of the positive and negative tabs are both perpendicular to the end face of the winding core. By adjusting the current directions of the positive and negative tabs, for example, in earphone applications, the magnetic field generated can be roughly parallel to the SPK, without coupling to the SPK, and the magnetic fields generated by the two equal in positive and negative directions can cancel each other out, minimizing the self-eddy current magnetic field of the steel-cased button battery. Furthermore, with the axially extending positive and negative tabs, the positive and negative tabs electrically connected to the external load are eliminated, completely avoiding the additional magnetic field generated by the positive and negative tabs, further minimizing the potential impact of current noise.

[0015] For example, using headphones as an example, the SPK can be placed in the low-magnetic field area to effectively eliminate the noise generated by the battery's eddy current magnetic field on the headphone side. Furthermore, in the case of matching headphones, the battery solution provided by this solution can be used for both headphones, simultaneously solving the eddy current noise problem for both ears.

[0016] Illustratively, the positive electrode pin and the negative electrode pin may be located on the same side of the housing, or the positive electrode pin and the negative electrode pin may be located on two sides of the housing, respectively.

[0017] Based on the first aspect, or the first embodiment of the first aspect, or the second embodiment of the first aspect, the embodiment of the present application further provides a fourth embodiment of the first aspect: the positive electrode tab includes a positive electrode tab connection portion and a positive electrode lead portion connected to each other, the positive electrode tab connection portion includes a first portion and a second portion folded in half along the axial direction, the first portion of the positive electrode tab connection portion is electrically connected to the positive electrode sheet, specifically, the first portion of the positive electrode tab connection portion can be electrically connected to the outer ring of the positive electrode sheet, the second portion of the positive electrode tab connection portion covers the outer side of the winding core, the positive electrode lead portion is connected to the second portion of the positive electrode tab connection portion, and radially extends from the first opening on the outer shell; the negative electrode tab includes a negative electrode tab connection portion and a negative electrode lead portion connected to each other, the negative electrode tab connection portion includes a first portion and a second portion folded in half along the axial direction, the first portion of the negative electrode tab connection portion is electrically connected to the negative electrode sheet, specifically, the first portion of the negative electrode tab connection portion can be electrically connected to the outer ring of the negative electrode sheet, the second portion of the negative electrode tab connection portion covers the outer side of the winding core, the negative electrode lead portion is connected to the second portion of the negative electrode tab connection portion, and radially extends from the second opening on the outer shell. With this arrangement, the positive electrode tab connection portion of the positive electrode tab and the negative electrode tab connection portion of the negative electrode tab are both folded structures, and the magnetic fields formed can be offset and will not be coupled to the SPK, and the magnetic fields formed by the positive pin portion and the negative pin portion will not affect the SPK; at the same time, based on the radially extending positive and negative electrode tabs, the positive and negative electrode adapters electrically connected to the external load are eliminated, which can further avoid the possible impact of current noise.

[0018] In practical applications, the second portion of the positive tab connection portion can be covered by the diaphragm on the outside of the winding core, or by the insulating layer on the outside of the winding core; correspondingly, the second portion of the negative tab connection portion can be covered by the diaphragm on the outside of the winding core, or by the insulating layer on the outside of the winding core.

[0019] Based on the first aspect, or the first embodiment of the first aspect, or the second embodiment of the first aspect, the embodiment of the present application further provides a fifth embodiment of the first aspect: the battery further includes a positive electrode post, a first opening is formed on the peripheral wall of the shell, and the positive electrode post is inserted into the first opening; the positive electrode tab includes a first portion and a second portion formed by folding in half along the axial direction, the first portion of the positive electrode tab is electrically connected to the positive electrode sheet, the second portion of the positive electrode tab covers the outside of the winding core, and the positive electrode post is electrically connected to the second portion of the positive electrode tab; the negative electrode tab includes a first portion and a second portion formed by folding in half along the axial direction, the first portion of the negative electrode tab is electrically connected to the negative electrode sheet, the second portion of the negative electrode tab covers the outside of the winding core, and the second portion is electrically connected to the shell. In this way, without adding any compensation sheets or leads to the outside of the battery, a large low magnetic field area can be constructed by significantly reducing the background magnetic field of the winding core and adjusting the magnetic field direction of the positive and negative tabs. In addition, this embodiment adopts a fully sealed battery structure, which, on the basis of effectively solving eddy current noise, further improves the sealing reliability of the battery cell and enhances the long-term storage performance of the battery.

[0020] In practical applications, the second part of the positive electrode tab can be covered by the diaphragm on the outside of the winding core, or by the insulating layer on the outside of the winding core; correspondingly, the second part of the negative electrode tab can be covered by the diaphragm on the outside of the winding core, or by the insulating layer on the outside of the winding core.

[0021] Based on the third embodiment of the first aspect, or the fourth embodiment of the first aspect, or the fifth embodiment of the first aspect, the present application also provides a sixth embodiment of the first aspect: an insulating paper is provided between the positive electrode tab and the inner wall of the housing, and a positive electrode insulating member is provided between the positive electrode tab and the first opening of the housing. This can effectively prevent short circuits.

[0022] Based on the first aspect, or the first embodiment of the first aspect, or the second embodiment of the first aspect, the embodiment of the present application further provides a seventh embodiment of the first aspect: the battery further includes a positive electrode post and a positive electrode connecting piece, the positive electrode post extending axially from the outer shell; the positive electrode piece is electrically connected to the positive electrode post through the positive electrode tab, and the negative electrode piece is electrically connected to the outer shell through the negative electrode tab; the positive electrode connecting piece is electrically connected to the extended end of the positive electrode post and extends to the side of the battery cell to form the positive electrode pin of the battery; the positive electrode connecting piece is a conductor segment between the positive electrode pin and the connection position with the positive electrode post, and one side edge of the conductor segment has a groove formed by an arc segment, and the groove has a first side edge and a second side edge set at an angle on both sides, and the first side edge and the second side edge are both straight edges. In this configuration, based on the groove provided on the side edge of the positive electrode connecting piece, the current from the positive electrode post side to the positive electrode pin side will flow concentratedly into the groove, and the skin effect principle is used to accurately control the distribution of the current on the conductor segment; that is, the current path of the compensation loop is controlled based on the setting of the groove, rather than being uniformly distributed in other areas of the conductor segment.

[0023] Based on the seventh embodiment of the first aspect, the present application also provides an eighth embodiment of the first aspect: the arc segment used to form the groove includes an inwardly concave arc segment and an outwardly convex arc segment sequentially connected between the first side edge and the second side edge, and the angle α between the reverse extension line of the first side edge on the conductor segment side and the second side edge is 10° to 30°. With this arrangement, the formed groove also has a better compensation effect.

[0024] In other practical applications, the arc segment is an arc connected between the first side edge and the second side edge, or the arc segment includes multiple arcs connected between the first side edge and the second side edge; the angle α between the reverse extension line of the first side edge on the conductor segment side and the second side edge is 10° to 30°, and the groove formed also has a good compensation effect.

[0025] In practical applications, an insulating layer is provided between the positive electrode connecting piece and the end surface of the shell, and an insulating layer is provided between the positive electrode post and the shell, which can effectively prevent short circuits.

[0026] A second aspect of an embodiment of the present application provides a battery, which includes a battery cell, the battery cell includes a shell, a winding core, a positive electrode tab, a negative electrode tab and a positive electrode post, wherein the winding core is arranged inside the shell and is formed by winding a negative electrode sheet, a diaphragm and a positive electrode sheet; its positive electrode post extends axially out of the shell; the positive electrode sheet is electrically connected to the positive electrode post through the positive electrode tab, and the negative electrode sheet is electrically connected to the shell through the negative electrode tab; the positive electrode connecting piece is electrically connected to the protruding end of the positive electrode post, and extends to the side of the battery cell to form the positive electrode pin of the battery; the positive electrode connecting piece is a conductor segment from the positive electrode pin to the connection position with the positive electrode post, and one side edge of the conductor segment has a groove formed by an arc segment, and the two sides of the groove have a first side edge and a second side edge set at an angle, and the first side edge and the second side edge are both straight edges. With this arrangement, based on the groove provided on the side edge of the positive connecting piece, the current from the positive pole side to the positive pin side will be concentrated in the groove, and the skin effect principle will be used to accurately control the distribution of the current on the conductor segment; that is, the current path of the compensation loop is controlled based on the setting of the groove, rather than being evenly distributed in other areas of the conductor segment.

[0027] For example, the arc segment includes an inwardly concave arc segment and an outwardly convex arc segment sequentially connected between the first side edge and the second side edge. The angle α between the reverse extension of the first side edge on the conductor segment side and the second side edge is 10° to 30°. In this way, the formed groove also has a better compensation effect.

[0028] In other practical applications, the arc segment is an arc connected between the first side edge and the second side edge, or the arc segment includes multiple arcs connected between the first side edge and the second side edge; the angle α between the reverse extension line of the first side edge on the conductor segment side and the second side edge is 10° to 30°, and the groove formed also has a good compensation effect.

[0029] A third aspect of an embodiment of the present application provides an electronic device, including a battery and a load device electrically connected to the battery, wherein the battery is the battery as described above.

[0030] In some practical applications, the electronic device may be a device of different types with a load device. For example, the electronic device may be an earphone, and the load device may be a speaker of the earphone. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] FIG1 is a schematic diagram of the overall structure of a battery provided in an embodiment of the present application;

[0032] FIG2 is an exploded view of the assembly of the battery shown in FIG1 ;

[0033] FIG3 is a schematic diagram of a usage state of the battery shown in FIG1 ;

[0034] FIG4 is a schematic diagram of a winding structure of a winding core provided in an embodiment of the present application;

[0035] FIG5 is a schematic diagram showing the comparison of the positive electrode sheet and the negative electrode sheet shown in FIG4 ;

[0036] FIG6 shows schematic structural diagrams of different passivation treatments;

[0037] FIG7 is a simulation diagram of the magnetic field strength formed by the battery shown in FIG1 ;

[0038] FIG8 is a schematic diagram of the overall structure of another battery provided in an embodiment of the present application;

[0039] FIG9 is an exploded view of the assembly of the battery shown in FIG8 ;

[0040] FIG10 is a schematic diagram of a usage state of the battery shown in FIG8 ;

[0041] FIG11 is a simulation diagram of the magnetic field strength formed by the battery shown in FIG8 ;

[0042] FIG12 is a schematic diagram of the overall structure of another battery provided in an embodiment of the present application;

[0043] FIG13 is an exploded view of the assembly of the battery shown in FIG12 ;

[0044] FIG14 is a cross-sectional view of the assembly relationship between the positive electrode tab, the negative electrode tab and the battery cell housing shown in FIG13;

[0045] FIG15 is a schematic diagram of a usage state of the battery shown in FIG12;

[0046] FIG16 is a simulation diagram of the magnetic field strength formed by the battery shown in FIG12 ;

[0047] FIG17 is a schematic diagram of the overall structure of another battery provided in an embodiment of the present application;

[0048] FIG18 is an exploded view of the assembly of the battery shown in FIG17 ;

[0049] FIG19 is a cross-sectional view of the assembly relationship between the positive electrode tab, the negative electrode tab and the battery cell housing shown in FIG18;

[0050] FIG20 is a schematic diagram of a usage state of the battery shown in FIG17;

[0051] FIG21 is a simulation diagram of the magnetic field strength generated by the battery shown in FIG17 ;

[0052] FIG22 is a schematic diagram of the overall structure of another battery provided in an embodiment of the present application;

[0053] FIG23 is an exploded view of the assembly of the battery shown in FIG22 ;

[0054] FIG24 is a top view of the battery shown in FIG22;

[0055] FIG25 is a simulation diagram of the magnetic field strength generated by the battery shown in FIG22 . DETAILED DESCRIPTION

[0056] An embodiment of the present application provides a battery based on a roll core structure. By adjusting the roll core structure, the roll core background magnetic field generated by the difference between the positive and negative pole pieces can be effectively reduced, thereby significantly improving the user experience.

[0057] In existing technologies, wound battery cells inevitably generate eddy current magnetic fields during operation. These eddy currents can affect the user experience to varying degrees in specific applications. For example, in headphones, these eddy currents couple with the headphone coil, driving the headphone speaker (SPK) to generate current sound, affecting the sound quality and resulting in a poor user experience.

[0058] Based on this, an embodiment of the present application provides a battery, which includes a battery cell, which includes a shell, a winding core, a positive electrode tab and a negative electrode tab, and the winding core arranged inside the shell is formed by winding the negative electrode sheet, the diaphragm and the positive electrode sheet. Specifically, a spiral winding core structure is formed by winding in the order of negative electrode sheet-diaphragm-positive electrode sheet-diaphragm through a winding process, and along the circumference of the winding core, the positive electrode tab is electrically connected to the positive electrode sheet at a first position, and the negative electrode tab is electrically connected to the negative electrode sheet at a second position. The circumferential direction here refers to the winding direction of the winding core structure. In this embodiment, the length of the positive electrode sheet is greater than the length of the negative electrode sheet, the winding end of the positive electrode sheet exceeds the winding end of the negative electrode sheet, and the positive electrode tab is electrically connected to the positive electrode sheet that exceeds the winding end of the negative electrode sheet; in other words, the first position is located at any position where the positive electrode sheet exceeds the winding end of the negative electrode sheet. The part from the second position to the first position of the positive electrode sheet is the positive electrode extension section. In order to prevent safety problems, the inner surface of the positive electrode extension section can be further passivated. The "passivation treatment" here is used to avoid or reduce the migration flow of lithium ions between the positive electrode extension section of the positive electrode sheet and the inner negative electrode sheet, and avoid safety risks by controlling the migration flow of lithium ions in the extension section.

[0059] With this setting, through the structural adjustment of the length of the positive electrode plate, the background magnetic field of the winding core can be reasonably controlled, and the influence of the eddy current magnetic field can be effectively reduced, providing technical guarantee for improving user experience.

[0060] At the same time, compared to methods that require adding compensation circuits, reducing connection power, or installing magnetic isolation materials, this solution simplifies the structural implementation, reduces manufacturing and assembly tolerances, and reduces overall implementation costs without affecting the user experience. Furthermore, for the same capacity and battery life requirements, this solution's architecture can reasonably reduce battery size, making it widely applicable to the design of lightweight and thin products.

[0061] To better understand the technical solutions and effects of this application, without loss of generality, the following detailed description of a specific embodiment will be provided with reference to the accompanying drawings, using wireless headphones as an application scenario for the battery 10. Referring to Figures 1 and 2, Figure 1 is a schematic diagram of the overall structure of a battery provided in an embodiment of this application, and Figure 2 is an exploded view of the assembly of the battery shown in Figure 1.

[0062] As shown in FIG1 , the positive electrode tab 2 and the negative electrode tab 3 of the battery 10 extend axially out of the battery cell 1 , and the positive electrode tab 2 and the negative electrode tab 3 are disposed at opposite ends of the battery cell 1 .

[0063] As shown in Figure 2, the core 11 of the battery cell 1 is enclosed in a housing formed by a bottom shell 12 and a top cover 13. The bottom shell 12 includes an axial end opening, and the top cover 13 is sealed and connected to the axial end opening of the bottom shell 12 to accommodate the core 11. A second opening 121 is defined at the bottom of the bottom shell 12, and a first opening 131 is defined on the top cover 13, for extending the positive electrode tab 2 and the negative electrode tab 3, respectively.

[0064] Here, the material of the bottom shell 12 and the top cover 13 can be stainless steel, aluminum alloy or soft aluminum-plastic film, and the soft aluminum-plastic film can be formed by laminating PP / aluminum layer / outer packaging nylon layer or matte layer. Specifically, the bottom shell 12 and the top cover 13 can be connected by a welding process, such as but not limited to laser welding or ultrasonic welding. In addition, in a specific implementation, the positive electrode tab 2 can be an aluminum sheet or a nickel sheet, and the negative electrode tab 3 can be a nickel sheet, a stainless steel sheet or a copper sheet, which is not limited in the embodiment of the present application.

[0065] As shown in the figure, the positive electrode tab 2 extends from the first opening 131 of the top cover 13 to the battery cell 1, and the positive electrode pin of the battery is formed by the protruding end of the positive electrode tab 2; the negative electrode tab 3 extends from the second opening 121 of the bottom shell 12 to the battery cell 1, and the bottom shell 12, the top cover 13 and the negative electrode tab 3 of the winding core 11 are connected together to form the negative electrode of the battery cell, and the negative electrode pin of the battery is formed by the protruding end of the negative electrode tab 3.

[0066] To establish a reliable insulation relationship, a positive electrode insulator 14 is provided between the positive electrode tab 2 and the first opening 131 of the top cover 13 to prevent short circuits. In a specific implementation, the positive electrode insulator 14 can be made of different materials, such as, but not limited to, PP (polypropylene), PPS (polyphenylene sulfide), PFA (polyfluoroalkoxy), or PEEK (poly(ether-ether-ketone)).

[0067] In this embodiment, both the positive electrode tab 2 and the negative electrode tab 3 are perpendicular to the end face of the winding core and are electrically connected to the external load by extending straight out along the axial direction of the winding core, eliminating the need for separate positive and negative electrode adapters. Please also refer to Figure 3, which shows a schematic diagram of the battery shown in Figure 1 in one state of use.

[0068] As shown in Figure 3, the SPK 20 and battery 10 are positioned opposite each other along the axial direction of the winding core. Due to the axially extending positive and negative tabs, the current flow directions of both positive and negative tabs 2 and 3 are perpendicular to the end face of the winding core. By adjusting the current flow direction of the positive and negative tabs, the magnetic field generated is roughly parallel to the SPK 20 and does not couple to the SPK 20. The positive and negative magnetic fields generated by the two equal in value cancel each other out, minimizing the self-eddy current magnetic field of the steel-cased button cell. Furthermore, due to the axially extending positive and negative tabs, the positive and negative electrode adapters electrically connected to the external load are eliminated, completely avoiding the additional magnetic field generated by the configuration of the positive and negative electrode adapters.

[0069] In other specific implementations, the positive electrode tab 2 and the negative electrode tab 3 may extend from the battery cell 1 in opposite directions; that is, the positive electrode tab 2 extends from the battery cell through the second opening on the bottom shell side, and the negative electrode tab extends from the battery cell through the first opening on the top cover side (not shown in the figure). This embodiment of the present application is not limited thereto.

[0070] Please also refer to Figure 4, which is a schematic diagram of the winding structure of the winding core 11 provided in an embodiment of the present application. For ease of understanding, the long dotted line in Figure 4 shows the negative electrode sheet 112, the short dotted line shows the positive electrode sheet 111, and the solid line shows the separator between the positive and negative electrode sheets.

[0071] As shown in Figure 4, the positive electrode tab 2 is electrically connected to the outer ring of the positive electrode sheet 111, and the negative electrode tab 3 is electrically connected to the outer ring of the negative electrode sheet 112, respectively, for collecting or releasing current during the battery charging and discharging processes. In this embodiment, the first position A of the positive electrode sheet 111 is used for welding the positive electrode tab (not shown in the figure), and the second position B of the negative electrode sheet 112 is used for welding the negative electrode tab (not shown in the figure). The first position A and the second position B are respectively located on the outermost layer of the winding-formed electrode sheet.

[0072] Among them, the length of the positive electrode sheet 111 is greater than the length of the negative electrode sheet 112, and the winding end A1 of the positive electrode sheet 111 exceeds the winding end B1 of the negative electrode sheet 112. Here, the welding position of the positive electrode tab (first position A) is located at the portion of the positive electrode sheet 111 that exceeds the negative electrode sheet 112. For the convenience of description, the portion from the second position B to the first position A of the positive electrode sheet 111 is defined as the positive electrode extension section L. When the battery is powered, based on the positive electrode extension section L, the magnetic field generated by the negative electrode side of the battery cell winding structure can be offset, and the background magnetic field of the core generated by the difference between the positive and negative electrode sheets can be reduced, effectively reducing the impact of the eddy current magnetic field on the SPK.

[0073] As shown in Figure 4, the outer surface of the positive electrode extension section L is covered with a separator to form good physical insulation between the outer shell. In other possible implementations, the outer surface of the positive electrode extension section L can also be covered with an insulating layer (not shown in the figure) to also form reliable physical insulation.

[0074] Furthermore, the welding position (first position A) between the positive electrode tab 2 and the positive electrode sheet 111 can be wound 270° to 300° more than the welding position (second position B) between the negative electrode tab 3 and the negative electrode sheet 112; in other words, the winding angle formed by the positive electrode extension section L of the positive electrode sheet 111 along the circumferential direction can be 270° to 300°. For example, the winding angle formed by the positive electrode extension section L shown in FIG4 is approximately 270°. In other specific implementations, it can be determined according to the actual product design and is not limited here.

[0075] In a specific implementation, the positive electrode plate 111 can be formed using an aluminum sheet as a substrate, and then a positive electrode material is coated on the surface of the aluminum sheet to form a cathode plate. The positive electrode material may include, but is not limited to, one or more of lithium cobalt oxide, nickel-cobalt-manganese ternary materials, and lithium manganese oxide. The negative electrode plate 112 can be formed using a steel sheet as a substrate, and then a negative electrode material is coated on the surface of the steel sheet to form an anode plate. For example, but not limited to, the negative electrode material may be graphite or silicon.

[0076] During charging, current flows from an external power source through the battery's positive electrode. During charging, lithium ions migrate from the positive electrode material on the cathode side to the negative electrode material on the anode side, while electrons flow from the negative electrode to the positive electrode, storing energy. During battery use, current flows from the positive electrode to power the external circuit. During discharge, lithium ions flow from the anode side to the cathode side, while electrons flow from the external circuit back to the negative electrode, releasing energy.

[0077] Please also refer to Figure 5, which is a schematic diagram showing the unfolded comparison relationship of the positive electrode sheet 111 and the negative electrode sheet 112 shown in Figure 4. As shown in the unfolded diagram of the positive electrode sheet 111 and the negative electrode sheet 112, the winding start end A2 of the positive electrode sheet 111 and the winding start end B2 of the negative electrode sheet 112 are both located on the left side of the diagram, and correspondingly, the winding end A1 of the positive electrode sheet 111 and the winding end B1 of the negative electrode sheet 112 are both located on the right side of the diagram.

[0078] In specific implementations, this passivation treatment can be implemented using various methods. See Figure 6 , which illustrates schematic diagrams of the positive electrode extension segments after various passivation treatments. For ease of description, the drawings depicting the corresponding components are not enlarged to scale, and the schematic diagrams are merely illustrative and should not limit the scope of protection of this application.

[0079] In one implementation, the positive electrode extension section L of the positive electrode sheet 111 can be passivated without being coated with positive electrode material. As shown in FIG6A , the surface of the substrate 1111 of the positive electrode sheet 111 is coated with positive electrode material 1112 to facilitate lithium ion migration during charge and discharge. The positive electrode extension section L is not coated with positive electrode material. For example, in the case of an aluminum sheet substrate for the positive electrode sheet 111, the substrate 1111 of the positive electrode extension section L is exposed.

[0080] Furthermore, to improve processability, the substrate 1111 between the welding point (first position A) between the positive electrode tab 2 and the positive electrode sheet 111 and the winding end A1 can also be left uncoated with positive electrode material. In other words, the positive electrode extension L and the positive electrode sheet between the first position A and the winding end A1 are also passivated. Overall, this provides excellent processability.

[0081] In another implementation, the positive extension section L of the positive electrode sheet 111 can be passivated by coating it with an insulating layer, such as, but not limited to, insulating adhesive. As shown in FIG6B , the positive extension section L and the portion of the positive electrode sheet between the first position A and the winding end A1 are not coated with positive electrode material, but instead are coated with an insulating layer 1113 on both sides of the substrate.

[0082] In another embodiment, the positive extension section L of the positive electrode sheet 111 may be coated with a barrier material to form a barrier material layer, such as, but not limited to, a ceramic coating, a resin coating, or a rubber coating. Specifically, the positive extension section L and the positive electrode sheet between the first position A and the winding end A1 are not coated with positive electrode material, and a barrier material is coated on both sides of the substrate to form a barrier material layer (not shown in the figure; see FIG6B for the configuration of the insulating layer).

[0083] The two aforementioned passivation treatment methods are both alternative coating methods for conventional positive electrode materials. In other possible implementations, the passivation treatment of the inner surface of the positive electrode extension section L can also be achieved by changing the positive electrode material.

[0084] In one implementation, for the positive extension section L of the positive electrode sheet 111 , a positive electrode material having a density lower than that of the negative electrode material may be used (not shown in the figure, see the configuration relationship of the insulating layer shown in FIG6B ).

[0085] In another implementation, the thickness of the positive electrode material layer can be reduced for the positive electrode extension section L of the positive electrode sheet 111 to achieve passivation. As shown in FIG6C , compared to the thickness of the positive electrode material 1112 coated in other areas of the positive electrode sheet 111 , the positive electrode material 1112 can be coated in the positive electrode extension section L and the positive electrode sheet between the first position A and the winding end A1 with the same thickness, but with a thinner positive electrode material layer.

[0086] In another implementation scheme, for the method of thinning the thickness of the positive electrode material layer to achieve passivation treatment, as shown in Figure 6D, the outer side of the thinned positive electrode material 1112 can also be coated with an insulating layer 1114, such as but not limited to insulating glue, to further enhance the passivation treatment effect.

[0087] It should be noted that the above-mentioned passivation treatment implementation methods can be implemented only on the inner surface of the positive electrode extension section L, or can be implemented on the surfaces of both sides of the positive electrode extension section L as shown in the figure, so as to reduce the process implementation cost.

[0088] Furthermore, with the axially extended positive and negative tabs, there's no longer a need to reserve space inside the battery for the positive column, or for welding the positive and negative tabs. The saved space can be used to arrange the winding core, effectively increasing battery capacity. Furthermore, this application eliminates the external positive and negative electrode adapters and related structures like the positive column, effectively reducing battery weight.

[0089] For the battery described in FIG1 , a battery in which the length of the existing negative electrode plate is longer than that of the positive electrode plate and is electrically connected to an external load via a positive and negative electrode adapter is used as a comparative example, and trial production and comparison of capacity and weight are performed.

[0090] Among them, the battery capacity comparison is shown in Table 1 below.

[0091] Table 1

[0092] As shown in the above table, compared with the battery described in Comparative Example 1, based on the same diameter and height dimensions, the capacity of the batteries described in the two embodiments of the present application solution increased by 7.2%.

[0093] Table 2

[0094] As shown in the data in the above table, compared with the battery described in Comparative Example 1, based on the same diameter and height dimensions, the weight of the battery described in Example 1 of the present application is reduced by 7.6%, and the weight of the battery described in Example 2 of the present application is reduced by 7.86%.

[0095] Overall, for batteries of the same size, the architecture based on this application solution can significantly increase battery capacity and significantly improve the product's battery life; at the same time, it can also reasonably reduce battery weight, in line with the trend of lightweight design requirements for products.

[0096] In this embodiment, based on the wound battery core structure that can reduce the background magnetic field of the winding core, and the axially straight positive and negative ear structure configuration, the current sound interference caused by the eddy current magnetic field of the battery can be significantly eliminated. Please also refer to Figure 7, which is a simulation diagram of the magnetic field strength formed based on the battery shown in Figure 1. As shown in Figure 7, by applying the embodiment of the present application, a low magnetic field area with a large area can be constructed, and the earphone SPK 20 can be placed corresponding to the low magnetic field area, thereby effectively eliminating the noise formed by the eddy current magnetic field of the battery on the earphone side. At the same time, in the application scenario of the adapted earphone, the left and right earphones can be applied based on a set of battery solutions provided by this solution. The two "+" in the box shown in the figure are the left and right earphone SPKs, respectively, where the magnetic field strength at the SPK position on the left is 0.5*10 -6 T~0.7*10 -6 T, the magnetic field strength at the SPK position on the right is 0.1*10 -6 T~0.2*10 -6 T, can solve the problem of eddy current noise in the left and right ears at the same time, and can reasonably control manufacturing costs and management costs without increasing the difficulty of production and assembly.

[0097] In the battery solution described in Figure 1 above, the axially extending positive and negative tabs extend out of the battery cell in opposite directions. In other implementations, the positive and negative tabs may extend out of the battery cell in the same direction, as shown in Figures 8 and 9. Figure 8 is a schematic diagram of the overall structure of another battery provided in an embodiment of the present application, and Figure 9 is an exploded view of the assembled battery shown in Figure 8. To clearly illustrate the differences and connections between this embodiment and the embodiment described in Figure 1, identical functional components and structures are indicated in the figures with the same reference numerals.

[0098] As shown in Figure 8 , in this embodiment, the positive and negative tabs 2 and 3 of the battery 10a extend axially from the cell 1, and are located at the same end of the cell 1. As shown in Figure 9 , the winding core 11 of the cell 1 is enclosed within a housing formed by a bottom case 12 and a top cover 13a. The top cover 13a is provided with a first opening 131a and a second opening 132a for extending the positive and negative tabs 2 and 3, respectively. A positive insulator 14 is provided between the positive tab 2 and the first opening 131a of the top cover 13a to prevent short circuits.

[0099] In this embodiment, the positive electrode tab 2 and the negative electrode tab 3 are also electrically connected to the outside by extending straight out along the axial direction of the winding core, eliminating the need for separate positive and negative electrode adapters. The remaining structure and connection relationships are the same as those described in Figure 1 and will not be repeated here.

[0100] Please also refer to FIG10 , which shows a schematic diagram of a usage state of the battery shown in FIG8 .

[0101] As shown in Figure 10, the SPK 20 and battery 10a are positioned opposite each other along the axial direction of the winding core. Similarly, the current flow through the positive and negative tabs 2 and 3 is perpendicular to the end face of the winding core. The resulting magnetic field is roughly parallel to the SPK 20, preventing coupling to it. The magnetic fields generated by the two, with equal values ​​in both positive and negative directions, cancel each other out. Furthermore, the axially extending positive and negative tabs eliminate the need for positive and negative electrode adapters electrically connected to an external load.

[0102] Similarly, this embodiment is based on a wound cell structure that can reduce the background magnetic field of the winding core, and the axially straight positive and negative tab structure configuration, which can significantly eliminate the current sound interference caused by the battery's eddy current magnetic field. Please also refer to Figure 11, which is a simulation diagram of the magnetic field strength generated by the battery shown in Figure 8. Here, compared with the previous embodiment, due to the difference in the tab lead-out method, the magnetic field distribution in the peripheral edge area in the magnetic field strength simulation diagram of the two schemes is slightly different.

[0103] As shown in Figure 11, by applying the embodiment of the present application, a relatively large low magnetic field area can be constructed. The earphone SPK is placed in the corresponding low magnetic field area, which can effectively eliminate the noise generated by the battery eddy current magnetic field on the earphone side. At the same time, in the application scenario of the earphone adaptation, the battery solution provided by this solution can be applied to the left and right earphones. As shown in the figure, the two "+" in the box are the left and right earphone SPK respectively, where the magnetic field strength at the left SPK position is 0.45*10 -6 T~0.6*10 -6 T, the magnetic field strength at the SPK position on the right is 0.1*10 -6 T~0.2*10 -6T, can solve the problem of eddy current noise in both left and right ears.

[0104] In the battery solutions described in Figures 1 and 8 above, both the positive and negative tabs extend axially from the battery cell. In other implementations, the positive and negative tabs may also extend radially from the battery cell, as shown in Figures 12 and 13. Figure 12 is a schematic diagram of the overall structure of another battery provided in an embodiment of the present application, and Figure 13 is an exploded view of the assembled battery shown in Figure 12. To clearly illustrate the differences and connections between this embodiment and the embodiment described in Figure 1, identical functional components and structures are indicated in the figures using the same reference numerals.

[0105] As shown in Figure 12 , in this embodiment, the positive electrode tab 2b and negative electrode tab 3b of the battery 10b extend radially out of the battery cell 1. As shown in Figure 13 , the winding core 11 of the battery cell 1 is enclosed within a housing formed by a bottom shell 12b and a top cover 13b. The bottom shell 12b has two openings formed on its peripheral wall for the positive electrode tab 2b and negative electrode tab 3b to extend out, respectively.

[0106] In this embodiment, the positive electrode tab 2b includes a connected positive tab connection portion 21b and a positive lead portion 22b. The positive tab connection portion 21b includes a first portion 211b and a second portion 212b folded in half along the axial direction. The first portion 211b of the positive tab connection portion 21b is electrically connected to the outer ring of the positive electrode sheet, and the second portion 212b of the positive tab connection portion 21b is bent and overlies the outer side of the winding core 11. The positive lead portion 22b is connected to the second portion 212b of the positive tab connection portion 21b and extends radially from the peripheral wall of the bottom shell 12b. For example, but not limited to, the second portion 212b can be overlaid on a diaphragm on the outer side of the winding core 11, or the second portion 212b can be overlaid on the insulating layer on the outer side of the winding core 11, which is not limited in this embodiment of the present application.

[0107] Please refer to Figures 13 and 14 together, wherein Figure 14 is a cross-sectional view of the assembly relationship between the positive electrode tab, the negative electrode tab and the battery cell casing shown in Figures 12 and 13, and the figure is formed at the cutting position shown by CC in Figure 12.

[0108] A positive electrode insulator 14 is provided between the positive electrode tab 2b and the first opening 121b of the peripheral wall of the bottom shell 12b, and insulating paper 15 is provided between the positive electrode tab connection portion 21b and the bottom shell 12b to prevent short circuits. In a specific implementation, the insulating paper 15 is L-shaped, insulating the second portion 212b of the positive electrode tab connection portion 21b and the folded connection portion between the first portion 211b and the second portion 212b from the bottom shell 12b. It is understood that the insulating paper 15 is not limited to the shape shown in the figure, as long as it can achieve the above-mentioned physical insulation between the inner wall of the battery cell housing and the positive electrode tab.

[0109] The negative electrode tab 3b includes a connected negative tab connection portion 31b and a negative lead portion 32b. The negative tab connection portion 31b includes a first portion 311b and a second portion 312b folded in half along the axial direction. The first portion 311b of the negative tab connection portion 31b is electrically connected to the outer ring of the negative electrode plate, and the second portion 312b of the negative tab connection portion 31b is bent and covers the outside of the winding core 11. The negative lead portion 32b is connected to the second portion 312b of the negative tab connection portion 31b and extends radially from the second opening 122b of the peripheral wall of the bottom shell 12b. For example, but not limited to, the second portion 312b can cover the diaphragm on the outside of the winding core 11, or the second portion 312b can cover the insulating layer on the outside of the winding core 11, which is not limited in this embodiment of the present application.

[0110] In this embodiment, the positive electrode tab 2b and the negative electrode tab 3b are electrically connected to the outside by extending radially along the winding core, eliminating the need for separate positive and negative electrode adapters. The remaining structure and connection relationships are the same as those in the embodiment described in Figure 1 and will not be repeated here.

[0111] Please also refer to FIG. 15 , which shows a schematic diagram of a usage state of the battery shown in FIG. 12 .

[0112] As shown in Figure 15, the SPK 20 and battery 10b are arranged opposite each other along the axial direction of the winding core. Similarly, the positive tab connection portion of the positive tab 2b and the negative tab connection portion of the negative tab 3b are both folded in half, canceling out the magnetic fields generated and preventing coupling to the SPK 20. Furthermore, the magnetic fields generated by the positive lead portion 22b and the negative lead portion 32b do not affect the SPK 20. Furthermore, the radially extending positive and negative tabs eliminate the need for positive and negative electrode adapters for electrical connection to an external load.

[0113] Similarly, this embodiment is based on a wound battery core structure that can reduce the background magnetic field of the winding core, and a radially extending positive and negative ear structure configuration, which can significantly eliminate the current sound interference caused by the eddy current magnetic field of the battery. Please also refer to Figure 16, which is a simulation diagram of the magnetic field strength formed based on the battery shown in Figure 12. As shown in Figure 16, by applying the embodiment of the present application, a low magnetic field area with a large area can be constructed, and the earphone SPK 20 can be placed corresponding to the low magnetic field area, thereby effectively eliminating the noise formed by the eddy current magnetic field of the battery on the earphone side. At the same time, in the application scenario of the adapted earphone, the left and right earphones can be applied based on a set of battery solutions provided by this solution. The two "+" in the box shown in the figure are the left and right earphone SPKs, respectively, where the magnetic field strength at the SPK position on the left is 0.8*10 -6 T~1.0*10 -6 T, the magnetic field strength at the SPK position on the right is 0.5*10 -6 T~0.6*10 -6 T, can solve the problem of eddy current noise in both left and right ears.

[0114] For the batteries depicted in Figures 1, 8, and 12, power supply dBSPL (measured in decibels of sound pressure) was tested, using a conventional battery using C-shaped negative terminal connector routing for magnetic field cancellation as a comparison. The test data is shown in Table 3 below.

[0115] Table 3

[0116] As shown in the data in the above table, the batteries described in the three embodiments of the present application have test dBSPL values ​​that are significantly smaller than those of the control examples, and the resulting current noise has a smaller impact.

[0117] In the battery described in the preceding embodiment, both the positive and negative electrode tabs extend from the cell. In other specific implementations, a fully sealed solution may also be employed. Please refer to Figures 17 and 18 . Figure 17 is a schematic diagram of the overall structure of another battery provided in an embodiment of this application, and Figure 18 is an exploded view of the assembled battery shown in Figure 17 . To clearly illustrate the differences and connections between this embodiment and the embodiment described in Figure 1 , identical functional components and structures are indicated in the figures using the same reference numerals.

[0118] As shown in Figure 17 , in this embodiment, the positive and negative tabs of the battery 10c are both internally mounted within the battery cell 1, with the positive electrode post 23c radially extending from the sidewall of the battery cell 1's casing. As shown in Figure 18 , the winding core 11 of the battery cell 1 is housed within a casing formed by a bottom casing 12c and a top cover 13c. The bottom casing 12c has a peripheral opening formed to accommodate the positive electrode post 23c.

[0119] In this embodiment, the positive electrode tab 2c includes a first portion 21c and a second portion 22c folded in half along the axial direction. The first portion 21c of the positive electrode tab 2c is electrically connected to the outer ring of the positive electrode sheet. The second portion 22c of the positive electrode tab 2c is bent and overlies the outer side of the winding core 11. The positive electrode column 23c is electrically connected to the second portion 22c of the positive electrode tab 2c. For example, but not limited to, the second portion 22c can overlie the separator on the outer side of the winding core 11, or the second portion 22c can overlie the insulating layer on the outer side of the winding core 11. This is not limited in this embodiment of the present application.

[0120] Please refer to Figures 18 and 19 together, wherein Figure 19 is a cross-sectional view of the assembly relationship between the positive electrode tab, the negative electrode tab and the battery cell casing shown in Figures 18 and 19, and the figure is formed at the cutting position shown by DD in Figure 18.

[0121] A positive electrode insulator 14 is provided between the positive electrode post 23c and the peripheral wall opening 121c of the bottom shell 12c, and an insulating paper 15 is provided between the positive electrode tab 2c and the shell to prevent short circuits. In a specific implementation, the insulating paper 15 can be in the "L" shape shown in the figure, isolating the second portion 22c of the positive electrode tab 2c from the bottom shell 12c, and isolating the folded connection between the first portion 21c and the second portion 22c of the positive electrode tab 2c from the top cover 13c. It is understood that the insulating paper 15 is not limited to the shape shown in the figure, as long as it can achieve the above-mentioned insulation.

[0122] The negative electrode tab 3c includes a first portion 31c and a second portion 32c folded in half along the axial direction. The first portion 31c is electrically connected to the outer ring of the negative electrode sheet. The second portion 32c is bent and overlies the outer side of the winding core 11. The second portion 32c is electrically connected to the bottom shell 12c. For example, but not limited to, the second portion 32c can overlie a separator on the outer side of the winding core 11, or the second portion 32c can overlie an insulating layer on the outer side of the winding core 11. This is not limited in this embodiment of the present application.

[0123] In this embodiment, the positive electrode column 23c arranged on the side wall of the shell is connected to the positive electrode tab 2c to form the positive electrode of the battery cell 1, and the bottom shell 12c and the top cover 13c are connected to the negative electrode tab 3c to form the negative electrode of the battery cell.

[0124] In a specific implementation, the first portion 31c and second portion 32c of the negative electrode tab 3c are parallel to the height of the winding core, and the second portion 32c can be laser welded to the inner wall of the bottom shell 12c. For the negative electrode side, the product is directly welded to the outer shell of the battery cell 1 to form an electrical connection, eliminating the need to lead out the negative electrode tab or set up a separate negative electrode adapter. In addition, the first portion 21c and second portion 22c of the positive electrode tab 2c are parallel to the height of the winding core, and the second portion 22c can be laser welded to the positive electrode post 23c. The product is directly welded to the positive electrode post to form an electrical connection, eliminating the need to lead out the negative and positive electrode tabs or set up a separate positive electrode adapter.

[0125] In addition, a reliable electrical connection can be formed between the product and the outer shell of the battery core 1 by welding the nickel plating layer or the tin plating layer. This embodiment of the present application is not limited.

[0126] The other structures and connection relationships are the same as those in the embodiment described in FIG1 and will not be described in detail here.

[0127] Please refer to Figure 20, which shows a schematic diagram of a usage state of the battery shown in Figure 17. As shown in Figure 20, SPK 20 and battery 10c are arranged opposite to each other along the axial direction of the core. Without adding any compensation sheets or leads to the outside of the battery, a low magnetic field area with a large area can be constructed by significantly reducing the background magnetic field of the core and adjusting the direction of the magnetic field of the positive and negative ears. Please also refer to Figure 21, which is a simulation diagram of the magnetic field strength formed based on the battery shown in Figure 17. Placing the earphone SPK 20 corresponding to this low magnetic field area can effectively eliminate the noise generated by the eddy current magnetic field of the battery on the earphone side. At the same time, in the application scenario of adapting earphones, the left and right earphones can be applied based on a set of battery solutions provided by this solution. The two "+" in the box shown in the figure are the left and right earphone SPKs, respectively. Among them, the magnetic field strength at the SPK position on the left is 0.9*10 -6 T~1.0*10 -6 T, the magnetic field strength at the SPK position on the right is 0.5*10 -6 T~0.7*10 -6 T, can solve the problem of eddy current noise in both left and right ears.

[0128] In addition, this embodiment adopts a fully sealed battery structure, which not only effectively solves the eddy current noise, but also further improves the sealing reliability of the battery cell, thereby enhancing the long-term storage performance of the battery.

[0129] Please refer to Figures 22 and 23 , where Figure 22 is a schematic diagram of the overall structure of another battery provided in an embodiment of the present application, and Figure 23 is an exploded view of the assembly of the battery shown in Figure 22 . To clearly illustrate the differences and connections between this embodiment and the embodiment described in Figure 1 , identical functional components and structures are indicated in the figures using the same reference numerals.

[0130] As shown in FIG22 , the battery 10 d includes a cell 1 d and a positive electrode connecting tab 4 and a negative electrode connecting tab 5 disposed outside the cell 1 d , and is electrically connected to an external load via the positive electrode connecting tab 4 and the negative electrode connecting tab 5 , respectively.

[0131] As shown in FIG23 , the winding core 11 of the battery cell 1 d is built into a housing formed by a bottom shell 12 d and a top cover 13 d .

[0132] The positive electrode tab of the winding core 11 is electrically connected to the positive electrode post 6 via the positive electrode tab 2d. The positive electrode post 6 extends through the middle of the top cover 13d. The positive electrode post 6 can be made of aluminum, copper, or nickel. The positive electrode connecting piece 4 is electrically connected to the protruding end of the positive electrode post 6, and the two ends of the positive electrode connecting piece 4 extend to the side of the battery cell 1d, one end forming a positive electrode pin 41, and the other end forming a positioning portion 42. An insulating layer 141d can be provided between the positive electrode post 6 and the top cover 13d, and an insulating layer 142d can be provided between the positive electrode connecting piece 4 and the top cover 13d to prevent short circuits. For example, but not limited to, the insulating layer 141d and the insulating layer 142d can both be formed using insulating tape.

[0133] Here, the positioning portion 42 for positioning the battery assembly can be integrated on the positive electrode connecting piece 4 as shown in the figure. In other specific implementations, the positioning portion can also be configured independently, and can be selectively configured as needed, which is not limited in the embodiments of the present application.

[0134] Among them, the negative electrode sheet of the winding core 11 is electrically connected to the bottom shell 12d through the negative electrode tab 3d, the negative electrode connecting piece 5 is electrically connected to the bottom shell 12d on the opposite side of the positive electrode connecting piece 4, and one end of the negative electrode connecting piece 5 extends to the side of the battery cell 1d to form a negative electrode pin 51.

[0135] In this embodiment, there is a conductor segment 43 between the positive electrode pin 41 of the positive electrode connecting piece 4 and the connection position with the positive electrode column 6. A groove 431 is provided along one side of the conductor segment 43. Please refer to Figure 24, which is a top view of the battery shown in Figure 22.

[0136] The groove 431 is flanked by a first side edge 432 and a second side edge 433 arranged at an angle. Both the first side edge 432 and the second side edge 433 are straight edges, and an inwardly concave arc segment R1 and an outwardly convex arc segment R2 are sequentially connected between the first side edge 432 and the second side edge 433 to form the groove 431. Due to the groove 431 provided on the side edge of the positive electrode connecting plate 4, the current from the positive electrode column 6 to the positive electrode pin 41 will flow concentratedly into the groove 431 (as indicated by the arrow in the figure), and the skin effect principle is utilized to precisely control the distribution of the current on the conductor segment 43; that is, the current path of the compensation loop is controlled based on the provision of the groove 431, rather than being evenly distributed in other areas of the conductor segment 43.

[0137] It is understood that the positive electrode connecting sheet 4 can be of any shape, and any configuration based on a side edge to form the "current control zone" will achieve a significant current noise cancellation effect, and is not limited to the shape shown in the figure. Optionally, the angle α between the reverse extension line P of the first side edge 432 on the conductor segment 43 side and the second side edge 433 can be 10° to 30°, resulting in a groove 431 with a better compensation effect.

[0138] Without loss of generality, taking the current path formed by groove 431 shown in Figure 13 as an example, the resulting compensating magnetic field is perpendicular to the paper and inward. This arrangement allows the shape of groove 431 to control the direction of current flow, thereby controlling and adjusting the relative position of the compensating magnetic field within the winding plane. In other words, the groove 431 formed along the side of the conductor segment 43 forms a "current control zone." As a result, the counter-compensating magnetic field formed by the positive electrode connecting plate 4 is highly aligned with the magnetic field of the winding core itself, precisely canceling out the core's magnetic field and eliminating current noise.

[0139] Please also refer to Figure 25, which is a simulation diagram of the magnetic field strength formed based on the battery shown in Figure 22. As shown in Figure 25, the application of the embodiment of the present application can adjust the current density distribution in the positive electrode connecting plate, accurately control the magnetic field distribution of the current, and form a low magnetic field area in a specific area of ​​the battery. The earphone SPK 20 can be placed corresponding to the low magnetic field area to effectively eliminate the noise generated by the battery eddy current magnetic field on the earphone side. At the same time, in the application scenario of the adapted earphone, the left and right earphones can be applied based on a set of battery solutions provided by this solution. The two "+" in the box shown in the figure are the left and right earphone SPKs, respectively, where the magnetic field strength at the left SPK position is 0.3*10 -6 T~0.6*10 -6 T, the magnetic field strength at the SPK position on the right is 0.3*10 -6 T~0.6*10 -6 T, can solve the problem of eddy current noise in both left and right ears.

[0140] Furthermore, in a specific implementation, the groove may be formed by connecting the first side edge 432 and the second side edge 433 with an arc segment of another shape, which may be determined based on the overall product design requirements. For example, but not limited to, the groove may be formed by a single arc segment or multiple arc segments, as long as the current control area can be formed when power is applied.

[0141] In other implementations, based on the different magnetic field directions of the winding core body, the grooves for regulating the current flow path can also be set in the opposite direction on the other side edge of the conductor segment 43 (not shown in the figure). In another possible implementation, the grooves for regulating the current flow path can also be set on the side edge of the negative electrode connecting piece (not shown in the figure), which can also accurately control the relative position of the compensation magnetic field in the winding plane. In other possible implementations, the grooves for regulating the current flow path can also be set on the side edges of the positive and / or negative pole ears inside the battery cell, so that the positive and negative pole ears of the battery cell form a current noise compensation sheet, thereby achieving the purpose of eliminating the eddy current magnetic field.

[0142] In addition, the positive electrode connecting tab 4 and the negative electrode connecting tab 5 can be located on both sides of the battery 10d as shown in the figure. In other possible implementations, the positive electrode connecting tab 4 and the negative electrode connecting tab 5 can also be located on the same side of the battery (not shown in the figure).

[0143] For the battery described in Figure 22 , a battery using a conventional C-shaped negative electrode connector routing method for magnetic field cancellation was used as a comparative example. Power supply dBSPL (decibel sound pressure) measurements were performed. The test data is shown in Table 4 below.

[0144] Table 4

[0145] As shown in the data in the above table, the battery described in Figure 22 of this application has a test dBSPL value that is significantly lower than the control example, so the impact of the current sound is relatively small.

[0146] An embodiment of the present application also provides an electronic device, which includes a battery and a load device, wherein the load device is electrically connected to the positive and negative poles of the battery. The battery can be the battery described in Figures 1, 8, 12, 17 and 22 above.

[0147] The electronic device may be a product type including a load device, such as but not limited to a speaker of an earphone. It should be understood that other functional components of the corresponding electronic device are not the core invention of this application, and thus will not be described in detail herein.

[0148] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A battery, characterized in that: The invention comprises a battery cell, wherein the battery cell comprises a shell, a winding core, a positive electrode tab and a negative electrode tab, wherein the winding core is arranged inside the shell and is formed by winding a negative electrode sheet, a separator and a positive electrode sheet; along the circumference of the winding core, the positive electrode tab is electrically connected to the positive electrode sheet at a first position, and the negative electrode tab is electrically connected to the negative electrode sheet at a second position; wherein the winding end of the positive electrode sheet exceeds the winding end of the negative electrode sheet, and the first position is located at any position of the positive electrode sheet that exceeds the winding end of the negative electrode sheet; the portion of the positive electrode sheet between the second position and the first position is a positive extension segment, and at least the inner surface of the positive extension segment is passivated, and the inner surface is the surface of the positive extension segment facing the negative electrode sheet.

2. The battery according to claim 1, characterized in that The inner surface of the positive electrode extension section is passivated in that the substrate surface of the inner surface of the positive electrode extension section is not coated with positive electrode material.

3. The battery according to claim 1, characterized in that The inner surface of the positive electrode extension section is passivated in that the inner surface of the positive electrode extension section is coated with an insulating layer or a barrier material layer.

4. The battery according to claim 1, characterized in that The inner surface of the positive electrode extension section is passivated so that the density of the positive electrode material on the inner surface of the positive electrode extension section is lower than the density of the negative electrode material of the negative electrode plate.

5. The battery according to claim 1, characterized in that The inner surface of the positive electrode extension section is passivated in that the thickness of the positive electrode material on the inner surface of the positive electrode extension section is smaller than the thickness of the positive electrode material in other areas of the positive electrode sheet.

6. The battery according to claim 5, characterized in that The outer side of the positive electrode material of the positive electrode extension section is coated with an insulating layer.

7. The battery according to any one of claims 1 to 6, characterized in that The outer surface of the positive electrode extension section is covered with an insulating layer or a separator; the outer surface is the surface of the positive electrode extension section facing away from the negative electrode plate.

8. The battery according to any one of claims 1 to 6, characterized in that The winding angle formed by the positive extension section of the positive electrode sheet is 270° to 300°.

9. The battery according to claim 1, characterized in that The positive electrode tab and the negative electrode tab are both arranged axially, and the positive electrode tab axially extends out of a first opening on the shell to form a positive electrode pin of the battery; the negative electrode tab axially extends out of a second opening on the shell to form a negative electrode pin of the battery.

10. The battery according to claim 9, characterized in that The positive electrode pin and the negative electrode pin are located on the same side of the shell, or the positive electrode pin and the negative electrode pin are located on two sides of the shell respectively.

11. The battery according to claim 1, characterized in that The positive electrode tab comprises a positive electrode tab connection portion and a positive electrode pin portion connected to each other, the positive electrode tab connection portion comprises a first portion and a second portion folded in the axial direction, the first portion of the positive electrode tab connection portion is electrically connected to the positive electrode sheet, the second portion of the positive electrode tab connection portion covers the outer side of the winding core, the positive electrode pin portion is connected to the second portion of the positive electrode tab connection portion, and radially extends from a first opening on the housing; The negative electrode tab includes a negative electrode tab connection portion and a negative electrode pin portion connected to each other, the negative electrode tab connection portion includes a first portion and a second portion folded in half along the axial direction, the first portion of the negative electrode tab connection portion is electrically connected to the negative electrode sheet, the second portion of the negative electrode tab connection portion covers the outer side of the winding core, the negative electrode pin portion is connected to the second portion of the negative electrode tab connection portion, and extends radially from a second opening on the outer shell.

12. The battery according to claim 11, characterized in that The second portion of the positive electrode tab connection portion is covered by the separator on the outside of the winding core, or the insulating layer on the outside of the winding core; the second portion of the negative electrode tab connection portion is covered by the separator on the outside of the winding core, or the insulating layer on the outside of the winding core.

13. The battery according to claim 1, characterized in that It also includes a positive pole, a first opening is opened on the peripheral wall of the shell, and the positive pole is inserted into the first opening; The positive electrode tab comprises a first portion and a second portion folded in the axial direction, the first portion of the positive electrode tab is electrically connected to the positive electrode sheet, the second portion of the positive electrode tab covers the outer side of the winding core, and the positive electrode column is electrically connected to the second portion of the positive electrode tab; The negative electrode tab includes a first portion and a second portion folded in the axial direction, the first portion of the negative electrode tab is electrically connected to the negative electrode plate, the second portion of the negative electrode tab covers the outer side of the winding core, and the second portion is electrically connected to the shell.

14. The battery according to claim 13, characterized in that The second portion of the positive electrode tab is covered by the separator on the outside of the winding core, or the insulating layer on the outside of the winding core; the second portion of the negative electrode tab is covered by the separator on the outside of the winding core, or the insulating layer on the outside of the winding core.

15. The battery according to any one of claims 9 to 14, characterized in that Insulating paper is arranged between the positive electrode tab and the inner wall of the shell, and a positive electrode insulating member is arranged between the positive electrode tab and the first opening of the shell.

16. The battery according to any one of claims 1 to 6, characterized in that It also includes a positive electrode column and a positive electrode connecting sheet, wherein the positive electrode column axially extends out of the shell; the positive electrode sheet is electrically connected to the positive electrode column through the positive electrode tab, and the negative electrode sheet is electrically connected to the shell through the negative electrode tab; The positive connecting piece is electrically connected to the protruding end of the positive electrode column and extends to the side of the battery cell to form the positive pin of the battery; a conductor segment is provided between the positive pin of the positive connecting piece and the connection position with the positive electrode column, and one side edge of the conductor segment has a groove formed by an arc segment, and both sides of the groove have a first side edge and a second side edge set at an angle, and the first side edge and the second side edge are both straight edges.

17. The battery according to claim 16, characterized in that The arc segment includes an inner concave arc segment and an outer convex arc segment sequentially connected between the first side edge and the second side edge. The angle α between the reverse extension line of the first side edge on the conductor segment side and the second side edge is 10° to 30°.

18. The battery according to claim 16, characterized in that The arc segment is an arc segment connected between the first side edge and the second side edge, or the arc segment includes multiple arc segments connected between the first side edge and the second side edge; the angle α between the reverse extension line of the first side edge on the conductor segment side and the second side edge is 10° to 30°.

19. The battery according to claim 16, characterized in that An insulating layer is provided between the positive electrode connecting piece and the end surface of the shell, and an insulating layer is provided between the positive electrode column and the shell.

20. A battery, characterized in that: The battery cell comprises a shell, a winding core, a positive electrode tab, a negative electrode tab and a positive electrode column, wherein the winding core is arranged inside the shell and is formed by winding a negative electrode sheet, a separator and a positive electrode sheet; the positive electrode column axially extends out of the shell; the positive electrode sheet is electrically connected to the positive electrode column through the positive electrode tab, and the negative electrode sheet is electrically connected to the shell through the negative electrode tab; The positive connecting piece is electrically connected to the protruding end of the positive electrode column and extends to the side of the battery cell to form the positive pin of the battery; a conductor segment is provided between the positive pin of the positive connecting piece and the connection position with the positive electrode column, and one side edge of the conductor segment has a groove formed by an arc segment, and both sides of the groove have a first side edge and a second side edge set at an angle, and the first side edge and the second side edge are both straight edges.

21. The battery according to claim 20, characterized in that The arc segment includes an inner concave arc segment and an outer convex arc segment sequentially connected between the first side edge and the second side edge. The angle α between the reverse extension line of the first side edge on the conductor segment side and the second side edge is 10° to 30°.

22. The battery according to claim 20, characterized in that The arc segment is an arc segment connected between the first side edge and the second side edge, or the arc segment includes multiple arc segments connected between the first side edge and the second side edge; the angle α between the reverse extension line of the first side edge on the conductor segment side and the second side edge is 10° to 30°.

23. An electronic device, characterized in that: The invention comprises a battery and a load device electrically connected to the battery, wherein the battery is the battery according to any one of claims 1 to 22.

24. The electronic device according to claim 23, characterized in that: The load device is a speaker.

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