A battery and electronic device

Abstract

A battery and electronic device are disclosed. The battery cell includes a casing, a core, a positive electrode tab, and a negative electrode tab. The core is disposed inside the casing and is formed by winding a negative electrode sheet, a separator, and a positive electrode sheet. Along the circumference of the 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 winding end of the positive electrode sheet extends beyond the winding end of the negative electrode sheet. The first position is located at any position of the positive electrode sheet extending beyond 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 electrode extension. At least the inner surface of the positive electrode extension is passivated, and the inner surface is the surface of the positive electrode extension facing the negative electrode sheet. This configuration allows for reasonable control of the core's background magnetic field, effectively reducing the influence of eddy current magnetic fields, and mitigating safety risks.

Description

[0001] This application claims priority to Chinese Patent Application No. 202322482921.3, filed with the State Intellectual Property Office of China on September 12, 2023, entitled "A Battery and Electronic Device", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of electronic technology, and more particularly to a battery and an electronic device. Background Technology

[0003] True Wireless Earphones (TWS) have seen rapid development and widespread application due to their small size, portability, and freedom from wires. TWS earphone batteries primarily use button-type lithium batteries, whose cell structures are mostly assembled using a "winding" method. This winding process involves winding the battery in the order of negative electrode plate - separator - positive electrode plate - separator to form a spiral core structure. During charging and discharging, current flows along the cylindrical electrode plates, creating eddy currents. According to the principle of electromagnetic induction, changes in current generate a magnetic field.

[0004] In a wound battery cell, the currents in the positive and negative electrodes are of the same magnitude but opposite in direction, which can cancel out the induced magnetic field to some extent. However, for safety reasons in battery structure design, the length and width of the negative electrode are often greater than those of the positive electrode. At the same time, there is a difference in the permeability of the positive and negative electrodes. Therefore, eddy current magnetic fields are inevitably generated during the operation of the wound battery cell. These eddy current magnetic fields couple with the headphone coil, generating noise that directly affects the product's sound quality and user experience. Summary of the Invention

[0005] This application provides a battery and electronic device that can reduce the background magnetic field of the core caused by the difference between the positive and negative electrode sheets, effectively reduce interference to the load device, and improve the user experience.

[0006] The first aspect of this application provides a battery cell including a casing, a core, a positive electrode tab, and a negative electrode tab. The core is disposed inside the casing and is formed by winding a negative electrode sheet, a separator, and a positive electrode sheet. Along the circumference of the 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 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 extends beyond the winding end of the negative electrode sheet. The first position is located at any position where the positive electrode sheet extends beyond the winding end of the negative electrode sheet, that is, the positive electrode tab is electrically connected to the positive electrode sheet extending beyond 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 electrode extension section, wherein at least the inner surface of the positive electrode extension section is passivated, and the inner surface is the surface of the positive electrode sheet facing the negative electrode sheet. This design, through structural adjustments to the length of the positive electrode, allows the operating current of the extended positive electrode section to generate an eddy current magnetic field that counteracts the eddy current magnetic field generated by the negative electrode. This effectively controls the core's underlying magnetic field, reducing the impact of the eddy current magnetic field and providing a technical guarantee for improved user experience. Simultaneously, the "passivation treatment" avoids or reduces lithium-ion migration and flow between the extended positive electrode section and the inner negative electrode section, mitigating safety risks by controlling this migration and flow. Furthermore, compared to previous methods involving adding compensation circuits, reducing connection power, or using magnetic shielding materials, this design simplifies the structure, reduces manufacturing and assembly tolerance requirements, lowers overall implementation costs, and does not affect the user experience. Moreover, under the same capacity and range requirements, this architecture allows for a reasonable reduction in battery size, making it widely applicable to the design of thinner and lighter products.

[0007] In practical applications, the above passivation treatments can be implemented on the inner surface of the positive electrode extension section or on both sides of the positive electrode extension section L to reduce the process implementation cost.

[0008] For example, the passivation treatment involves leaving the substrate surface of the positive electrode extension section uncoated with positive electrode material. Therefore, while increasing the positive electrode extension section, the increase in battery size can be effectively controlled, which is beneficial for improving battery life.

[0009] The passivation treatment can be an insulating layer covering 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, passivation treatment can be completed by direct coating, and the process is relatively simple.

[0010] Other examples include a passivation treatment where the density of the positive electrode material in the positive electrode extension is lower than the density of the negative electrode material in the negative electrode sheet; or a passivation treatment where the thickness of the positive electrode material in the positive electrode extension is less 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 outside of the positive electrode material in the positive electrode extension.

[0011] Based on the first aspect, this application also provides a first implementation of the first aspect: the outer surface of the positive electrode extension is covered with an insulating layer or a separator. This ensures physical insulation between the positive electrode and the outer casing.

[0012] Based on the first aspect, or the first embodiment of the first aspect, this application also provides a second embodiment of the first aspect: the winding angle of the positive electrode extension section of the positive electrode sheet is 270° to 300°. That is, the welding position of the positive electrode tab and the positive electrode sheet can be wound 270° to 300° further than the welding position of the negative electrode tab and the negative electrode sheet. This setting can more stably and reliably counteract the magnetic field of the core body.

[0013] Based on the first aspect, or the first implementation of the first aspect, or the second implementation of the first aspect, this application also provides a third implementation of the first aspect: both the positive and negative electrodes are axially arranged, with the positive electrode extending axially out of a first opening on the outer casing to form the positive lead of the battery; the negative electrode extends axially out of a second opening on the outer casing to form the negative lead of the battery. Thus, based on the axially extending positive and negative electrodes, the current directions of both electrodes are perpendicular to the end face of the winding core. By adjusting the current direction of the positive and negative electrodes, taking an application in headphones as an example, the resulting magnetic field can be approximately parallel to the SPK (specified electrode), without coupling to the SPK, and the positive and negative magnetic fields formed by both are of equal value and can cancel each other out, minimizing the self-eddy current magnetic field of the steel-cased button battery; simultaneously, based on the axially extending positive and negative electrodes, the positive and negative electrode adapter connected to the external load is eliminated, completely avoiding the additional magnetic field generated by the positive and negative electrode adapter, further preventing the possible influence of current noise.

[0014] Taking headphones as an example, the headphone SPK can be placed in the corresponding low magnetic field area to effectively eliminate noise generated by the battery's eddy current magnetic field on the headphone side. Furthermore, in headphone-compatible applications, a single battery solution provided by this method can be applied to both left and right headphones, simultaneously resolving the eddy current noise issue in both ears.

[0015] For example, the positive and negative pins can be located on the same side of the housing, or the positive and negative pins can be located on opposite sides of the housing.

[0016] Based on the first aspect, or the first embodiment of the first aspect, or the second embodiment of the first aspect, this application also provides a fourth embodiment of the first aspect: the positive electrode tab includes a positive electrode tab connecting portion and a positive electrode pin portion connected together. The positive electrode tab connecting portion includes a first portion and a second portion formed by folding along the axial direction. The first portion of the positive electrode tab connecting portion is electrically connected to the positive electrode sheet. Specifically, the first portion of the positive electrode tab connecting portion can be electrically connected to the outer ring of the positive electrode sheet. The second portion of the positive electrode tab connecting 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 connecting portion and extends radially from the first opening on the outer shell. The negative electrode tab includes a negative electrode tab connecting portion and a negative electrode pin portion connected together. The negative electrode tab connecting portion includes a first portion and a second portion formed by folding along the axial direction. The first portion of the negative electrode tab connecting portion is electrically connected to the negative electrode sheet. Specifically, the first portion of the negative electrode tab connecting portion can be electrically connected to the outer ring of the negative electrode sheet. The second portion of the negative electrode tab connecting 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 connecting portion and extends radially from the second opening on the outer shell. With this configuration, both the positive electrode connection and the negative electrode connection are folded structures, which cancels out the magnetic field and prevents coupling to SPK. Furthermore, the magnetic fields formed by the positive and negative leads do not affect SPK. At the same time, based on the radially extending positive and negative electrodes, the positive and negative adapter piece that is electrically connected to the external load is eliminated, which further avoids the influence of current noise.

[0017] In practical applications, the second part of the positive electrode connection 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 connection 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.

[0018] Based on the first aspect, or the first embodiment of the first aspect, or the second embodiment of the first aspect, this application also 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 outer casing, and the positive electrode post is inserted into the first opening; the positive electrode tab includes a first part and a second part formed by folding along the axial direction, the first part of the positive electrode tab is electrically connected to the positive electrode sheet, the second part of the positive electrode tab covers the outside of the winding core, and the positive electrode post is electrically connected to the second part of the positive electrode tab; the negative electrode tab includes a first part and a second part formed by folding along the axial direction, the first part of the negative electrode tab is electrically connected to the negative electrode sheet, the second part of the negative electrode tab covers the outside of the winding core, and the second part is electrically connected to the outer casing. In this way, without adding any compensation plates or leads to the outside of the battery, a large low magnetic field region can be formed by significantly reducing the background magnetic field of the winding core and adjusting the direction of the magnetic field of the positive and negative electrodes. In addition, this embodiment adopts a fully sealed battery structure, which effectively solves the eddy current noise and further improves the sealing reliability of the battery cell, thereby enhancing the long-term storage performance of the battery.

[0019] 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.

[0020] Based on the third, fourth, or fifth implementation of the first aspect, this application also provides a sixth implementation of the first aspect: an insulating paper is provided between the positive electrode tab and the inner wall of the outer casing, and a positive electrode insulating element is provided between the positive electrode tab and the first opening of the outer casing. This effectively prevents short circuits.

[0021] Based on the first aspect, or the first embodiment of the first aspect, or the second embodiment of the first aspect, this application also 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 out of the outer casing; the positive electrode piece is electrically connected to the positive electrode post through a positive electrode tab, and the negative electrode piece is electrically connected to the outer casing through a 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 cell to form the positive electrode pin of the battery; the area between the positive electrode pin of the positive electrode connecting piece and the connection position with the positive electrode post is a conductor segment, one side 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 included angle, both the first side edge and the second side edge being straight edges. With 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 be concentrated to the groove, and the skin effect principle is used to accurately control the current distribution on the conductor segment; that is, the current path of the compensation circuit is controlled based on the groove, rather than being uniformly distributed in other areas of the conductor segment.

[0022] Based on the seventh embodiment of the first aspect, this application also provides an eighth embodiment of the first aspect: the arc segment for forming 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 configuration, the formed groove also has a better compensation effect.

[0023] In other practical applications, the arc segment is an arc connecting the first side edge and the second side edge, or the arc segment includes multiple arc segments connecting 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°, and the resulting groove also has a good compensation effect.

[0024] In practical applications, an insulating layer is provided between the positive electrode connector and the end face of the outer casing, and an insulating layer is provided between the positive electrode post and the outer casing. This effectively prevents short circuits.

[0025] A second aspect of this application provides a battery comprising a cell, the cell including a casing, a winding core, a positive electrode tab, a negative electrode tab, and a positive electrode post. The winding core is disposed inside the casing and is formed by winding a negative electrode sheet, a separator, and a positive electrode sheet. The positive electrode post extends axially out of the casing. The positive electrode sheet is electrically connected to the positive electrode post via the positive electrode tab, and the negative electrode sheet is electrically connected to the casing via the negative electrode tab. A positive electrode connecting piece is electrically connected to the extended end of the positive electrode post and extends to the side of the cell to form the positive electrode pin of the battery. A conductor segment is formed between the positive electrode pin of the positive electrode connecting piece and the connection position with the positive electrode post. 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 included angle. Both the first side edge and the second side edge are straight edge edges. With this configuration, based on the groove on the side edge of the positive electrode connector, the current from the positive electrode post side to the positive electrode pin side will flow to the groove, and the skin effect principle will be used to precisely control the current distribution on the conductor segment; that is, the current path of the compensation circuit is controlled based on the groove, rather than being evenly distributed in other areas of the conductor segment.

[0026] For example, the arc segment includes a concave arc segment and a convex arc segment connected sequentially between the first side edge and the second side edge, and 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.

[0027] In other practical applications, the arc segment is an arc connecting the first side edge and the second side edge, or the arc segment includes multiple arc segments connecting 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°, and the resulting groove also has a good compensation effect.

[0028] A third aspect of this application provides an electronic device, including a battery and a load device electrically connected to the battery, wherein the battery is the battery described above.

[0029] In some practical applications, the electronic device can be of different device types with load devices. For example, the electronic device can be headphones, and the load device is the headphone speaker. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of a battery provided in an embodiment of this application;

[0031] Figure 2 for Figure 1An exploded view of the battery assembly shown in the diagram;

[0032] Figure 3 for Figure 1 A schematic diagram of one usage state of the battery shown;

[0033] Figure 4 A schematic diagram of a winding structure for a core provided in this application embodiment;

[0034] Figure 5 Figure 4 A schematic diagram showing the unfolded comparison between the positive and negative electrode plates;

[0035] Figure 6 shows schematic diagrams of structures with different passivation treatments;

[0036] Figure 7 For based on Figure 1 Simulation diagram of the magnetic field strength generated by the battery shown;

[0037] Figure 8 This is a schematic diagram of the overall structure of another battery provided in an embodiment of this application;

[0038] Figure 9 for Figure 8 An exploded view of the battery assembly shown in the diagram;

[0039] Figure 10 for Figure 8 A schematic diagram of one usage state of the battery shown;

[0040] Figure 11 For based on Figure 8 Simulation diagram of the magnetic field strength generated by the battery shown;

[0041] Figure 12 This is a schematic diagram of the overall structure of another battery provided in an embodiment of this application;

[0042] Figure 13 for Figure 12 An exploded view of the battery assembly shown in the diagram;

[0043] Figure 14 for Figure 13 A cross-sectional view showing the assembly relationship between the positive and negative electrode tabs and the battery cell casing;

[0044] Figure 15 for Figure 12 A schematic diagram of one usage state of the battery shown;

[0045] Figure 16 The image is based on Figure 12 Simulation diagram of the magnetic field strength generated by the battery shown;

[0046] Figure 17This is a schematic diagram of the overall structure of another battery provided in an embodiment of this application;

[0047] Figure 18 for Figure 17 An exploded view of the battery assembly shown in the diagram;

[0048] Figure 19 for Figure 18 A cross-sectional view showing the assembly relationship between the positive and negative electrode tabs and the battery cell casing;

[0049] Figure 20 for Figure 17 A schematic diagram of one usage state of the battery shown;

[0050] Figure 21 For based on Figure 17 Simulation diagram of the magnetic field strength generated by the battery shown;

[0051] Figure 22 This is a schematic diagram of the overall structure of another battery provided in an embodiment of this application;

[0052] Figure 23 for Figure 22 An exploded view of the battery assembly shown in the diagram;

[0053] Figure 24 for Figure 22 A top view of the battery shown;

[0054] Figure 25 For based on Figure 22 The simulation diagram shows the magnetic field strength generated by the battery. Detailed Implementation

[0055] This application provides a battery based on a core structure. By adjusting the core structure, the core background magnetic field generated by the difference between the positive and negative electrode sheets can be effectively reduced, significantly improving the user experience.

[0056] In existing technologies, wound battery cells inevitably generate eddy current magnetic fields during operation. In various application scenarios, these eddy current magnetic fields affect the user experience to varying degrees. Taking headphones as an example, these eddy current magnetic fields couple with the headphone coil, driving the headphone speaker (SPK) to generate current noise, affecting the sound quality of the headphones and resulting in a poor user experience.

[0057] Based on this, this application provides a battery comprising a cell, which includes a casing, a core, a positive electrode tab, and a negative electrode tab. The core, disposed inside the casing, is formed by winding a negative electrode sheet, a separator, and a positive electrode sheet. Specifically, a spiral core structure is formed by winding the core in the order of negative electrode sheet-separator-positive electrode sheet-separator through a winding process. Along the circumferential direction of the 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. Here, circumferential direction refers to the winding direction of the core structure. In this embodiment, 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 extends beyond the winding end of the negative electrode sheet. The positive electrode tab is electrically connected to the positive electrode sheet extending beyond the winding end of the negative electrode sheet; in other words, the first position is located at any position where the positive electrode sheet extends beyond the winding end of the negative electrode sheet. The portion from the second position to the first position of the positive electrode sheet is the positive electrode extension. To prevent safety issues, the inner surface of the positive electrode extension can be passivated. This "passivation" is used to avoid or reduce lithium-ion migration and flow between the positive electrode extension and the inner negative electrode sheet. By controlling the lithium-ion migration and flow in this extension, safety risks can be avoided.

[0058] This configuration, through structural adjustments to the length of the positive electrode sheet, allows for reasonable control of the core's background magnetic field, effectively reducing the influence of eddy current magnetic fields and providing a technical guarantee for improving user experience.

[0059] Meanwhile, compared to adding compensation circuits, reducing connection power, or using magnetic shielding materials, this solution simplifies the structural implementation, reduces manufacturing and assembly tolerance requirements, lowers overall implementation costs, and does not affect the user experience. Furthermore, under the same capacity and battery life requirements, this architecture allows for a reasonable reduction in battery size, making it widely applicable to the design of thinner and lighter products.

[0060] To better understand the technical solution and effects of this application, and without loss of generality, the following will describe in detail the specific embodiments using wireless headphones as an example of the application scenario of the battery 10, in conjunction with the accompanying drawings. Please refer to... Figure 1 and Figure 2 ,in, Figure 1 This is a schematic diagram of the overall structure of a battery provided in an embodiment of this application. Figure 2 for Figure 1 The diagram shows an exploded view of the battery assembly.

[0061] like Figure 1 As shown, the positive electrode tab 2 and the negative electrode tab 3 of the battery 10 extend axially from the cell 1, and the positive electrode tab 2 and the negative electrode tab 3 are disposed opposite to each other at both ends of the cell 1.

[0062] like Figure 2As shown, the core 11 of the battery cell 1 is housed within a casing formed by a bottom shell 12 and a top cover 13. The bottom shell 12 includes a shaft end opening, and the top cover 13 is sealed to the shaft end opening of the bottom shell 12 to accommodate the core 11. A second through-hole 121 is provided at the bottom of the bottom shell 12, and a first through-hole 131 is provided on the top cover 13 to allow the positive electrode tab 2 and the negative electrode tab 3 to extend out, respectively.

[0063] Here, the bottom shell 12 and the top cover 13 can be made of stainless steel, aluminum alloy, or flexible aluminum-plastic film. This flexible 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 welding processes, such as, but not limited to, laser welding or ultrasonic welding. Furthermore, in specific implementations, 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; this embodiment does not impose limitations.

[0064] As shown in the figure, the positive electrode tab 2 extends from the first opening 131 of the top cover 13 into the cell 1, and forms the positive electrode pin of the battery through the extended end of the positive electrode tab 2; the negative electrode tab 3 extends from the second opening 121 of the bottom shell 12 into the cell 1, and the negative electrode tabs 3 of the bottom shell 12, the top cover 13 and the core 11 are connected together to form the negative electrode of the cell, and forms the negative electrode pin of the battery through the extended end of the negative electrode tab 3.

[0065] 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 specific implementations, 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)).

[0066] 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 refer to [further details omitted]. Figure 3 The figure shows Figure 1 The diagram shows one usage state of the battery.

[0067] like Figure 3As shown, SPK 20 and battery 10 are arranged opposite each other along the axial direction of the winding core. Based on the axially extending positive and negative electrodes, the current directions of the positive electrode 2 and negative electrode 3 are perpendicular to the end face of the winding core. By adjusting the current direction of the positive and negative electrodes, the magnetic field formed is approximately parallel to SPK 20 and will not couple to SPK 20. Moreover, the positive and negative magnetic fields formed by the two are equal in value and can cancel each other out, so that the self-eddy current magnetic field of the steel-cased button cell is minimized. At the same time, based on the axially extending positive and negative electrodes, the positive and negative electrode adapter piece that is electrically connected to the external load is eliminated, and the additional magnetic field generated by the configuration of the positive and negative electrode adapter piece can be completely avoided.

[0068] In other specific implementations, the positive electrode tab 2 and the negative electrode tab 3 can also extend out of the cell 1 in opposite directions; that is, the positive electrode tab 2 extends out of the cell from the second opening on the bottom shell side, and the negative electrode tab extends out of the cell from the first opening on the top cover side (not shown in the figure). This application does not limit the embodiments.

[0069] Please see also Figure 4 This is a schematic diagram of the winding structure of the core 11 provided in an embodiment of this application. For ease of understanding, Figure 4 The long dotted line represents the negative electrode 112, the short dotted line represents the positive electrode 111, and the solid line represents the separator between the positive and negative electrodes.

[0070] like Figure 4 As shown, 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 battery charging and discharging. In this embodiment, the first position A of the positive electrode sheet 111 is used to weld the positive electrode tab (not shown in the figure), and the second position B of the negative electrode sheet 112 is used to weld 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 wound electrode sheet.

[0071] In this design, the length of the positive electrode 111 is greater than the length of the negative electrode 112, and the winding end A1 of the positive electrode 111 extends beyond the winding end B1 of the negative electrode 112. Here, the welding position of the positive electrode tab (first position A) is located on the portion of the positive electrode 111 that extends beyond the negative electrode 112. For ease of description, the portion from the second position B to the first position A of the positive electrode 111 is defined as the positive electrode extension L. In the battery-powered state, based on this positive electrode extension L, the magnetic field generated on the negative electrode side of the cell winding structure can be counteracted, reducing the core background magnetic field caused by the difference between the positive and negative electrode sheets, and effectively reducing the influence of the eddy current magnetic field on the SPK.

[0072] Figure 4As shown, the outer surface of the positive electrode extension L is covered with a separator to form good physical insulation with the outer casing. In other possible implementations, the outer surface of the positive electrode extension L can also be covered with an insulating layer (not shown in the figure), which can also form reliable physical insulation.

[0073] Furthermore, the welding position (first position A) between the positive electrode tab 2 and the positive electrode sheet 111 can be wound an additional 270° to 300° from the welding position (second position B) between the negative electrode tab 3 and the negative electrode sheet 112; in other words, the circumferential winding angle formed by the positive electrode extension L of the positive electrode sheet 111 can be 270° to 300°. For example, Figure 4 The winding angle formed by the positive electrode extension L shown is approximately 270°. In other specific implementations, it can be determined according to the actual product design, and is not limited here.

[0074] In a specific implementation, the positive electrode 111 can use an aluminum sheet as the substrate, and then coat the surface of the aluminum sheet with the positive electrode material to form a cathode electrode. This positive electrode material can be one or more of, but not limited to, lithium cobalt oxide, nickel-cobalt-manganese ternary materials, and lithium manganese oxide. The negative electrode 112 can use a steel sheet as the substrate, and then coat the surface of the steel sheet with the negative electrode material to form an anode electrode. For example, but not limited to, the negative electrode material can be graphite or silicon.

[0075] During charging, current flows from an external power source through the positive terminal of the battery. 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 also flow from the negative electrode to the positive electrode to store electrical energy. When the battery is in use, current flows out from the positive terminal to power an external circuit. During discharging, lithium ions flow from the anode side to the cathode side, while electrons flow back from the external circuit to the negative electrode, releasing electrical energy.

[0076] Please see also Figure 5 The image is Figure 4 The diagram shows a comparative view of the unfolded positive electrode 111 and negative electrode 112. As shown in the diagram, the starting point A2 of the winding of the positive electrode 111 and the starting point B2 of the winding of the negative electrode 112 are both located on the left side of the diagram. Correspondingly, the ending point A1 of the winding of the positive electrode 111 and the ending point B1 of the winding of the negative electrode 112 are both located on the right side of the diagram.

[0077] In practice, this passivation treatment can be implemented in different ways. Please refer to Figure 6, which shows schematic diagrams of the positive electrode extension section after different passivation treatments. For ease of description, the diagrams illustrating the corresponding structures are not locally enlarged to scale, and the schematic diagrams are merely examples and should not limit the scope of protection of this application.

[0078] In one implementation, the positive electrode extension L of the positive electrode 111 can be passivated by not covering it with positive electrode material. For example... Figure 6A As shown in the figure, the surface of the substrate 1111 of the positive electrode 111 is coated with positive electrode material 1112 to enable lithium ion migration during charging and discharging. The positive electrode extension L is not coated with positive electrode material. Taking the use of aluminum sheet as the substrate for the positive electrode 111 as an example, the substrate 1111 of the positive electrode extension L is in an exposed state.

[0079] Furthermore, to improve processability, the substrate 1111 between the welding position (first position A) of the positive electrode tab 2 and the positive electrode sheet 111 and the winding end A1 may also not be covered 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, it has good processability.

[0080] In another implementation, the positive electrode extension L of the positive electrode sheet 111 can be passivated by covering it with an insulating layer; for example, but not limited to, covering it with insulating adhesive. Figure 6B As shown in the figure, the positive electrode sheet between the positive electrode extension section L and the first position A to the winding end A1 is not covered with positive electrode material, and an insulating layer 1113 is wrapped on both sides of the substrate.

[0081] In another implementation, the positive electrode extension L of the positive electrode sheet 111 can 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 electrode sheet between the positive electrode extension L and the first position A to the winding end A1 is not covered with a 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 reference). Figure 6B (The diagram shows the arrangement of the insulating layers).

[0082] The two passivation methods mentioned above are alternatives to the coating of conventional cathode materials. In other possible implementations, passivation of the inner surface of the cathode extension L can also be achieved by changing the cathode material.

[0083] In one implementation, the positive electrode extension L of the positive electrode sheet 111 can be made of a positive electrode material with a density lower than that of the negative electrode material (not shown in the figure, see reference). Figure 6B (The diagram shows the arrangement of the insulating layers).

[0084] In another implementation, for the positive electrode extension L of the positive electrode sheet 111, the thickness of the positive electrode material layer can be reduced to achieve passivation. For example... Figure 6CAs shown in the figure, compared to the thickness of the positive electrode material 1112 covering other areas of the positive electrode sheet 111, the positive electrode extension section L and the positive electrode sheet between the first position A and the winding end A1 can be covered with the same positive electrode material 1112, and the thickness of the positive electrode material layer can be reduced.

[0085] In another implementation scheme, passivation is achieved by reducing the thickness of the positive electrode material layer, such as... Figure 6D As shown in the figure, the outer side of the thinned positive electrode material 1112 can be covered with an insulating layer 1114, for example, but not limited to, an insulating adhesive, to further enhance the passivation effect.

[0086] It should be noted that the above passivation treatment methods can be implemented only on the inner surface of the positive electrode extension L, or as shown in the figure, on both sides of the positive electrode extension L, in order to reduce the process implementation cost.

[0087] Furthermore, based on the axially extended positive and negative electrode tabs, there is no longer a need to reserve space for the positive electrode post in the height direction of the battery, nor for welding space for the positive and negative electrode tabs. The saved space can be used to arrange the core body, which can effectively increase the battery capacity. In addition, the solution of this application eliminates the external adapter plates for the positive and negative electrodes and related structures such as the positive electrode post, which can effectively reduce the battery weight.

[0088] against Figure 1 The battery described uses an existing battery with a negative electrode length greater than the positive electrode length, and which is electrically connected to an external load through a positive and negative electrode adapter, as a comparative example to compare its capacity and weight.

[0089] The battery capacity comparison is shown in Table 1 below.

[0090] Table 1

[0091]

[0092] Based on the data in the table above, compared to the battery described in Comparative Example 1, the capacity of the batteries described in the two embodiments of this application is increased by 7.2% for the same diameter and height.

[0093] Table 2

[0094]

[0095]

[0096] Based on the data in the table above, compared to the battery described in Comparative Example 1, the weight of the battery described in Embodiment 1 of this application is reduced by 7.6% and the weight of the battery described in Embodiment 2 of this application is reduced by 7.86% while maintaining the same diameter and height.

[0097] Overall, for batteries of the same size, the architecture proposed in this application can significantly increase battery capacity and improve the product's battery life; at the same time, it can also reasonably reduce battery weight, meeting the design requirements of the trend towards thinner and lighter products.

[0098] In this implementation scheme, based on the wound cell structure that reduces the background magnetic field of the core and the axially extended positive and negative electrode tab configuration, the current noise interference caused by the battery's eddy current magnetic field can be significantly eliminated. Please refer to [further details omitted]. Figure 7 The figure is based on Figure 1 The simulation diagram shows the magnetic field strength generated by the battery. Figure 7 As shown, by applying the embodiments of this application, a large low magnetic field region can be constructed. The earphone SPK 20 can be placed in this low magnetic field region, thereby effectively eliminating noise generated by the battery eddy current magnetic field on the earphone side. Furthermore, in earphone-compatible applications, a single battery solution provided by this method can be used for both left and right earphones. The two "+" signs in the box in the figure represent the left and right earphone SPKs, respectively. The magnetic field strength at the left SPK location is 0.5*10⁻⁶. -6 T ~ 0.7 * 10 -6 The magnetic field strength at position SPK on the right is 0.1*10. -6 T ~ 0.2 * 10 -6 T can solve the problem of eddy current noise in both ears at the same time, and can reasonably control manufacturing and management costs without increasing the difficulty of production and assembly.

[0099] The foregoing Figure 1 In the described battery design, the axially extending positive and negative tabs extend out of the cell in opposite directions. In other implementations, the positive and negative tabs may also extend out of the cell in the same direction; please refer to [link to relevant documentation]. Figure 8 and Figure 9 ,in, Figure 8 This is a schematic diagram of the overall structure of another battery provided in an embodiment of this application. Figure 9 for Figure 8 The diagram shows an exploded view of the battery assembly. This is to clearly illustrate the difference between this embodiment and... Figure 1 The differences and connections between the described embodiments, as well as the same functional components and structures, are illustrated in the figures using the same reference numerals.

[0100] like Figure 8 As shown, in this embodiment, the positive electrode tab 2 and the negative electrode tab 3 of the battery 10a extend axially from the cell 1, and the positive electrode tab 2 and the negative electrode tab 3 are disposed at the same end of the cell 1. Combined with... Figure 9As shown, the core 11 of the battery cell 1 is housed within a casing formed by a bottom shell 12 and a top cover 13a. The top cover 13a has a first opening 131a and a second opening 132a for the positive electrode tab 2 and the negative electrode tab 3 to extend out, respectively. A positive electrode insulator 14 is provided between the positive electrode tab 2 and the first opening 131a of the top cover 13a to prevent short circuits.

[0101] In this embodiment, both the positive electrode tab 2 and the negative electrode tab 3 are electrically connected to the outside via a straight-out manner along the axial direction of the winding core, eliminating the need for separate positive and negative electrode adapters. Other components and connections are similar to... Figure 1 The described embodiments are the same, and will not be repeated here.

[0102] Please see also Figure 10 The figure shows Figure 8 The diagram shows one usage state of the battery.

[0103] like Figure 10 As shown, SPK 20 and battery 10a are arranged opposite each other along the axial direction of the winding core. Similarly, the current direction of the positive electrode tab 2 and the negative electrode tab 3 is perpendicular to the end face of the winding core, and the magnetic field formed is roughly parallel to SPK 20 and will not couple to SPK 20. Moreover, the magnetic fields formed by the two are equal in positive and negative directions and can cancel each other out. At the same time, based on the axially extended positive and negative electrode tabs, the positive and negative electrode adapter piece that is electrically connected to the external load is eliminated.

[0104] Similarly, this implementation scheme, based on a wound cell structure that reduces the base magnetic field of the cell core and an axially extended positive and negative tab configuration, can significantly eliminate current noise interference caused by the battery's eddy current magnetic field. Please refer to [further details omitted]. Figure 11 The figure is based on Figure 8 The simulation diagram shows the magnetic field strength generated by the battery. Here, compared with the aforementioned implementation scheme, due to the difference in the tab lead-out method, the magnetic field distribution in the outer peripheral edge region of the magnetic field strength simulation diagrams of the two schemes is slightly different.

[0105] like Figure 11 As shown, by applying the embodiments of this application, a large low magnetic field region can be constructed. Placing the earphone SPK in this low magnetic field region can effectively eliminate the noise generated by the battery eddy current magnetic field on the earphone side. Furthermore, in earphone-compatible applications, a single battery solution provided by this method can be used for both left and right earphones. In the figure, the two "+" signs in the box represent the left and right earphone SPKs, respectively. The magnetic field strength at the left SPK location is 0.45*10. -6 T ~ 0.6 * 10 -6 The magnetic field strength at position SPK on the right is 0.1*10. -6 T ~ 0.2 * 10 -6T can solve the problem of vortex noise in both ears at the same time.

[0106] The foregoing Figure 1 and Figure 8 In the described battery design, both the positive and negative tabs extend axially out of the cell. In other implementations, the positive and negative tabs may also extend radially out of the cell; please refer to [link to relevant documentation]. Figure 12 and Figure 13 ,in, Figure 12 This is a schematic diagram of the overall structure of another battery provided in an embodiment of this application. Figure 13 for Figure 12 The diagram shows an exploded view of the battery assembly. This is to clearly illustrate the difference between this embodiment and... Figure 1 The differences and connections between the described embodiments, as well as the same functional components and structures, are illustrated in the figures using the same reference numerals.

[0107] like Figure 12 As shown, in this embodiment, the positive electrode tab 2b and the negative electrode tab 3b of the battery 10b extend radially from the cell 1. Combined with... Figure 13 As shown, the core 11 of the battery cell 1 is housed in a shell formed by the bottom shell 12b and the top cover 13b. Two openings are provided on the peripheral wall of the bottom shell 12b for the positive electrode tab 2b and the negative electrode tab 3b to extend out, respectively.

[0108] In this embodiment, the positive electrode tab 2b includes a positive electrode tab connecting portion 21b and a positive electrode lead portion 22b connected together. The positive electrode tab connecting portion 21b includes a first portion 211b and a second portion 212b formed by folding along the axial direction. The first portion 211b of the positive electrode tab connecting portion 21b is electrically connected to the outer ring of the positive electrode sheet, and the second portion 212b of the positive electrode tab connecting portion 21b is bent and covers the outside of the winding core 11. The positive electrode lead portion 22b is connected to the second portion 212b of the positive electrode tab connecting portion 21b and extends radially from the peripheral wall of the bottom shell 12b. For example, but not limited to, the second portion 212b may cover the diaphragm on the outside of the winding core 11, or the second portion 212b may cover the insulating layer on the outside of the winding core 11. This embodiment of the application is not limited to this.

[0109] Please see also Figure 13 and Figure 14 ,in, Figure 14 for Figure 12 and Figure 13 The diagram shows a cross-sectional view of the assembly relationship between the positive and negative electrode tabs and the battery cell casing. Figure 12 The sectioning position shown in the diagram (CC) is formed.

[0110] A positive electrode insulator 14 is provided between the positive electrode tab 2b and the first opening 121b on the peripheral wall of the bottom shell 12b, and an 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, which isolates and insulates the second part 212b of the positive electrode tab connection portion 21b and the folded connection portion of its first part 211b and the second part 212b from the bottom shell 12b. It can be 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 cell shell and the positive electrode tab.

[0111] The negative electrode tab 3b includes a negative electrode tab connecting portion 31b and a negative electrode lead portion 32b connected together. The negative electrode tab connecting portion 31b includes a first portion 311b and a second portion 312b formed by folding along the axial direction. The first portion 311b of the negative electrode tab connecting portion 31b is electrically connected to the outer ring of the negative electrode sheet, and the second portion 312b of the negative electrode tab connecting portion 31b is bent and covers the outside of the winding core 11. The negative electrode lead portion 32b is connected to the second portion 312b of the negative electrode tab connecting portion 31b and extends radially from the second through-hole 122b on the peripheral wall of the bottom shell 12b. For example, but not limited to, the second portion 312b may cover the diaphragm on the outside of the winding core 11, or the second portion 312b may cover the insulating layer on the outside of the winding core 11. The embodiments of this application are not limited.

[0112] 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 core, eliminating the need for separate positive and negative electrode adapters. Other components and connections are similar to... Figure 1 The described embodiments are the same, and will not be repeated here.

[0113] Please see also Figure 15 The figure shows Figure 12 The diagram shows one usage state of the battery.

[0114] like Figure 15 As shown, SPK 20 and battery 10b are arranged opposite each other along the axial direction of the winding core. Similarly, the positive tab connection of positive tab 2b and the negative tab connection of negative tab 3b are both folded structures, and the magnetic fields formed can cancel each other out and will not couple to SPK 20. Furthermore, the magnetic fields formed by positive pin 22b and negative pin 32b will not affect SPK 20. At the same time, based on the radially extending positive and negative tabs, the positive and negative adapter pieces that are electrically connected to the external load are eliminated.

[0115] Similarly, this implementation scheme, based on a wound cell structure that reduces the base magnetic field of the cell core and a radially extending positive and negative electrode tab configuration, can significantly eliminate current noise interference caused by the battery's eddy current magnetic field. Please refer to [further details omitted]. Figure 16 The figure is based on Figure 12 The simulation diagram shows the magnetic field strength generated by the battery. Figure 16 As shown, by applying the embodiments of this application, a large low magnetic field region can be constructed. The earphone SPK 20 can be placed in this low magnetic field region, thereby effectively eliminating noise generated by the battery eddy current magnetic field on the earphone side. Furthermore, in earphone-compatible applications, a single battery solution provided by this method can be used for both left and right earphones. The two "+" signs in the box in the figure represent the left and right earphone SPKs, respectively. The magnetic field strength at the left SPK location is 0.8*10⁻⁶. -6 T ~ 1.0 * 10 -6 The magnetic field strength at position SPK on the right is 0.5*10. -6 T ~ 0.6 * 10 - 6 T can solve the problem of vortex noise in both ears at the same time.

[0116] against Figure 1 , Figure 8 and Figure 12 The described battery was compared with an existing battery that uses C-shaped negative electrode connector wiring for magnetic field cancellation, and both were tested for dBSPL (sound pressure in decibels). The test data are shown in Table 3 below.

[0117] Table 3

[0118]

[0119] Based on the data in the table above, the tested dBSPL values ​​of the batteries described in the three embodiments of this application are all significantly lower than those of the comparative example, resulting in a smaller impact of current noise.

[0120] In the battery described in the foregoing embodiments, both the positive and negative electrode tabs extend out of the cell. In other implementations, a fully sealed design may also be used. See [link to relevant documentation]. Figure 17 and Figure 18 ,in, Figure 17 This is a schematic diagram of the overall structure of another battery provided in an embodiment of this application. Figure 18 for Figure 17 The diagram shows an exploded view of the battery assembly. This is to clearly illustrate the difference between this embodiment and... Figure 1 The differences and connections between the described embodiments, as well as the same functional components and structures, are illustrated in the figures using the same reference numerals.

[0121] like Figure 17 As shown, in this embodiment, both the positive and negative electrode tabs of the battery 10c are built inside the cell 1, wherein the positive electrode post 23c extends radially from the side wall of the cell 1's outer casing. Combined with... Figure 18As shown, the core 11 of the battery cell 1 is built into the outer shell formed by the bottom shell 12c and the top cover 13c. An opening is provided on the peripheral wall of the bottom shell 12c to insert the positive electrode post 23c.

[0122] In this embodiment, the positive electrode tab 2c includes a first part 21c and a second part 22c formed by folding along the axial direction. The first part 21c of the positive electrode tab 2c is electrically connected to the outer ring of the positive electrode sheet. The second part 22c of the positive electrode tab 2c is bent and covers the outside of the core 11. The positive electrode post 23c is electrically connected to the second part 22c of the positive electrode tab 2c. For example, but not limited to, the second part 22c may cover the diaphragm on the outside of the core 11, or the second part 22c may cover the insulating layer on the outside of the core 11. This embodiment of the application does not limit the scope of the invention.

[0123] Please see also Figure 18 and Figure 19 ,in, Figure 19 for Figure 18 and Figure 19 The diagram shows a cross-sectional view of the assembly relationship between the positive and negative electrode tabs and the battery cell casing. Figure 18 The sectioning position shown in the diagram (DD) is formed.

[0124] 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 outer shell to prevent short circuits. In a specific implementation, the insulating paper 15 can be an "L" shape as shown in the figure, which insulates the second part 22c of the positive electrode tab 2c from the bottom shell 12c, and insulates the folded connection between the first part 21c and the second part 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 insulation.

[0125] The negative electrode tab 3c includes a first part 31c and a second part 32c formed by folding along the axial direction. The first part 31c of the negative electrode tab 3c is electrically connected to the outer ring of the negative electrode sheet, and the second part 32c of the negative electrode tab 3c is bent and covers the outside of the core 11. The second part 32c is electrically connected to the bottom shell 12c. For example, but not limited to, the second part 32c can cover the diaphragm on the outside of the core 11, or the second part 32c can cover the insulating layer on the outside of the core 11. The embodiments of this application are not limited.

[0126] In this embodiment, the positive electrode post 23c disposed on the side wall of the outer casing 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.

[0127] In the specific implementation, the first part 31c and the second part 32c of the negative electrode tab 3c are both parallel to the height direction of the core. The second part 32c can be connected to the inner wall of the bottom shell 12c by laser welding. For the negative electrode side, the product is directly welded to the outer shell of the cell 1 to form an electrical connection, without the need to lead out the negative electrode tab or set a separate negative electrode adapter. In addition, the first part 21c and the second part 22c of the positive electrode tab 2c are both parallel to the height direction of the core. The second part 22c can be connected to the positive electrode post 23c by laser welding. The product is directly welded to the positive electrode post to form an electrical connection, without the need to lead out the negative and positive electrode tabs or set a separate positive electrode adapter.

[0128] Furthermore, a reliable electrical connection can be formed between the product and the outer casing of the battery cell 1 by soldering a nickel-plated or tin-plated layer. This application does not limit the scope of the embodiments.

[0129] Other components and connections Figure 1 The described embodiments are the same, and will not be repeated here.

[0130] Please see Figure 20 The figure shows Figure 17 This diagram illustrates one usage state of the battery. (See attached image.) Figure 20 As shown, SPK 20 and battery 10c are positioned opposite each other along the axial direction of the winding core. Without adding any compensation plates or leads to the outside of the battery, a large low-magnetic-field region can be created by significantly reducing the base magnetic field of the winding core and adjusting the magnetic field direction of the positive and negative electrode tabs. Please refer to [further details omitted]. Figure 21 The figure is based on Figure 17 The simulation diagram shows the magnetic field strength generated by the battery. Placing the earphone SPK 20 in this low magnetic field region can effectively eliminate the noise generated by the battery's eddy current magnetic field on the earphone side. Furthermore, in earphone-compatible applications, a single battery solution provided by this method can be used for both left and right earphones. The two "+" signs in the box in the figure represent the left and right earphone SPKs, respectively. The magnetic field strength at the left SPK location is 0.9*10⁻⁶. -6 T ~ 1.0 * 10 -6 The magnetic field strength at position SPK on the right is 0.5*10. -6 T ~ 0.7 * 10 -6 T can solve the problem of vortex noise in both ears at the same time.

[0131] In addition, this implementation scheme adopts a fully sealed battery structure, which not only effectively solves the eddy current noise problem, but also further improves the sealing reliability of the battery cells, thereby enhancing the long-term storage performance of the battery.

[0132] Please see Figure 22 and Figure 23 ,in, Figure 22This is a schematic diagram of the overall structure of another battery provided in an embodiment of this application. Figure 23 for Figure 22 The diagram shows an exploded view of the battery assembly. This is to clearly illustrate the difference between this embodiment and... Figure 1 The differences and connections between the described embodiments, as well as the same functional components and structures, are illustrated in the figures using the same reference numerals.

[0133] like Figure 22 As shown, the battery 10d includes a cell 1d and a positive electrode connecting piece 4 and a negative electrode connecting piece 5 disposed outside the cell 1d, and is electrically connected to an external load through the positive electrode connecting piece 4 and the negative electrode connecting piece 5 respectively.

[0134] Combination Figure 23 As shown, the core 11 of the battery cell 1d is housed within a casing formed by the bottom shell 12d and the top cover 13d.

[0135] In this design, the positive electrode plate of the core 11 is electrically connected to the positive electrode post 6 via the positive electrode tab 2d. The positive electrode post 6 extends from the center of the top cover 13d and can be made of aluminum, copper, or nickel. The positive electrode connecting piece 4 is electrically connected to the extended end of the positive electrode post 6, and both ends of the positive electrode connecting piece 4 extend to the side of the core 1d, with one end forming a positive electrode pin 41 and the other end forming a positioning part 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, both the insulating layer 141d and the insulating layer 142d can be formed of insulating tape.

[0136] Here, the positioning part 42 for battery assembly positioning can be integrated on the positive electrode connecting piece 4 as shown in the figure. In other specific implementations, the positioning part can also be configured independently. The specific configuration can be selectively configured as needed. This application embodiment does not limit this.

[0137] Among them, the negative electrode plate of the 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 core 1d to form a negative electrode pin 51.

[0138] In this embodiment, the section between the positive electrode pin 41 of the positive electrode connector 4 and the connection point with the positive electrode post 6 is a conductor segment 43. One side of the conductor segment 43 has a groove 431. Please refer to [the relevant documentation]. Figure 24 The image is Figure 22 The battery shown is shown in top view.

[0139] The groove 431 has a first side edge 432 and a second side edge 433 set at an included angle on both sides. Both the first side edge 432 and the second side edge 433 are straight edges. Between the first side edge 432 and the second side edge 433, there is a concave arc segment R1 and a convex arc segment R2 connected in sequence to form the groove 431. Based on the groove 431 set on the side edge of the positive electrode connecting piece 4, the current from the positive electrode post 6 side to the positive electrode pin 41 side will be concentrated in the groove 431 (as shown by the arrow in the figure). The skin effect principle is used to accurately control the current distribution on the conductor segment 43; that is, the current path of the compensation circuit is controlled based on the setting of the groove 431, rather than being uniformly distributed in other areas of the conductor segment 43.

[0140] It is understood that the positive electrode connecting piece 4 can be a sheet structure of any shape. Based on the configuration of one side edge to form the "current regulation area", it has a significant current noise cancellation effect, rather than being limited to the shape shown in the figure. Optionally, the angle α between the reverse extension P of the first side edge 432 on the conductor segment 43 side and the second side edge 433 can be 10° to 30°, and the resulting groove 431 has a better compensation effect.

[0141] Without loss of generality, Figure 13 Taking the current path formed by the groove 431 shown as an example, the resulting compensating magnetic field is perpendicular to the paper and inwards. With this configuration, the direction of current flow can be controlled by the shape of the groove 431, thereby controlling and adjusting the relative position of the compensating magnetic field within the winding plane; that is, a "current control zone" is formed using the groove 431 on the side edge of the conductor segment 43. Consequently, the reverse canceling magnetic field formed by the positive electrode connecting piece 4 highly coincides with the magnetic field of the winding core body, achieving precise cancellation of the winding core body's magnetic field and eliminating current noise.

[0142] Please see also Figure 25 The figure is based on Figure 22 The simulation diagram shows the magnetic field strength generated by the battery. Figure 25 As shown, by applying the embodiments of this application, the current density distribution in the positive electrode connector can be adjusted, and the magnetic field distribution of the current can be precisely controlled. A low magnetic field zone can be formed in a specific area of ​​the battery, and the earphone SPK 20 can be placed in this low magnetic field zone to effectively eliminate the noise generated by the battery's eddy current magnetic field on the earphone side. Furthermore, in earphone-compatible applications, a battery solution provided by this method can be used for both left and right earphones. The two "+" signs in the box in the figure represent the left and right earphone SPKs, respectively. The magnetic field strength at the left SPK position is 0.3*10. -6 T ~ 0.6 * 10 -6 The magnetic field strength at position SPK on the right is 0.3*10. -6 T ~ 0.6 * 10 -6 T can solve the problem of vortex noise in both ears at the same time.

[0143] In addition, in a specific implementation, the groove can be formed by connecting the first side edge 432 and the second side edge 433 with other shaped arc segments, which can be determined according to the overall design requirements of the product. For example, but not limited to, the groove can also be composed of a single arc segment or multiple other arc segments, as long as it can form the current regulation area when energized.

[0144] In other implementations, based on different magnetic field directions of the core body, the grooves used to regulate the current flow path can also be arranged 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 used to regulate the current flow path can also be arranged on the side edge of the negative electrode connecting piece (not shown in the figure), which can also precisely control the relative position of the compensating magnetic field in the winding plane. In other possible implementations, the grooves used to regulate the current flow path can also be arranged on the side edge of the positive electrode tab and / or negative electrode tab inside the cell, so that the positive and negative electrode tabs of the cell form current noise compensation pieces, thereby achieving the purpose of eliminating eddy current magnetic fields.

[0145] In addition, the positive electrode connecting piece 4 and the negative electrode connecting piece 5 can be located on both sides of the battery 10d as shown in the figure. In other possible implementations, the positive electrode connecting piece 4 and the negative electrode connecting piece 5 can also be located on the same side of the battery (not shown in the figure).

[0146] against Figure 22 The described battery was compared with an existing battery that uses C-shaped negative electrode connector wiring for magnetic field cancellation, and both were tested for dBSPL (sound pressure in decibels). The test data are shown in Table 4 below.

[0147] Table 4

[0148]

[0149] Based on the data shown in the table above, this application Figure 22 The batteries described showed significantly lower dBSPL values ​​than the comparative batteries, resulting in less impact from current noise.

[0150] This application also provides an electronic device, which includes a battery and a load device. The load device is electrically connected to the positive and negative terminals of the battery, and the battery can be as described above. Figure 1 , Figure 8 , Figure 12 , Figure 17 and Figure 22 The battery described.

[0151] The electronic device can be a product type that includes a load device, such as, but not limited to, the speaker of an earphone. It should be understood that other functions of the corresponding electronic device are not the core inventive point of this application, and therefore will not be elaborated upon herein.

[0152] The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A battery, characterized in that, The battery cell includes a housing, a core, a positive electrode tab, and a negative electrode tab. The core is disposed inside the housing and is formed by winding a negative electrode sheet, a separator, and a positive electrode sheet. The housing is formed by enclosing a bottom shell and a top cover. Along the circumference of the 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 winding end of the positive electrode sheet extends beyond the winding end of the negative electrode sheet. The first position is located at any position of the positive electrode sheet that extends beyond 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 electrode extension section. At least the inner surface of the positive electrode extension section is passivated, and the inner surface is the surface of the positive electrode extension section facing the negative electrode sheet.

2. The battery according to claim 1, characterized in that, The passivation treatment of the inner surface of the positive electrode extension section specifically means that the substrate surface of the inner surface of the positive electrode extension section is not covered with positive electrode material.

3. The battery according to claim 1, characterized in that, The passivation treatment of the inner surface of the positive electrode extension section specifically involves covering the inner surface of the positive electrode extension section with an insulating layer or a barrier material layer.

4. The battery according to claim 1, characterized in that, The passivation treatment of the inner surface of the positive electrode extension section specifically means 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 on the negative electrode sheet.

5. The battery according to claim 1, characterized in that, The passivation treatment of the inner surface of the positive electrode extension section specifically means that the thickness of the positive electrode material on the inner surface of the positive electrode extension section is less 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 positive electrode material of the extended positive electrode section is covered with an insulating layer on the outside.

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

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

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

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

11. The battery according to claim 1, characterized in that, The positive electrode tab includes a positive electrode tab connection portion and a positive electrode pin portion connected together. The positive electrode tab connection portion includes a first portion and a second portion formed by folding along the axial direction. The first portion of the positive electrode tab connection portion is electrically connected to the positive electrode plate. The second portion of the positive electrode tab connection portion covers the outside of the winding core. The positive electrode pin portion is connected to the second portion of the positive electrode tab connection portion and extends radially from the first opening on the outer shell. The negative electrode tab includes a negative electrode tab connecting part and a negative electrode pin part connected together. The negative electrode tab connecting part includes a first part and a second part formed by folding along the axial direction. The first part of the negative electrode tab connecting part is electrically connected to the negative electrode plate. The second part of the negative electrode tab connecting part covers the outside of the winding core. The negative electrode pin part is connected to the second part of the negative electrode tab connecting part and extends radially from the second opening on the outer shell.

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

13. The battery according to claim 1, characterized in that, It also includes a positive electrode post, and a first through-hole is provided on the peripheral wall of the outer shell, and the positive electrode post is inserted into the first through-hole; The positive electrode tab includes a first part and a second part formed by folding along the axial direction. The first part of the positive electrode tab is electrically connected to the positive electrode sheet. The second part of the positive electrode tab covers the outside of the winding core. The positive electrode post is electrically connected to the second part of the positive electrode tab. The negative electrode tab includes a first part and a second part formed by folding along the axial direction. The first part of the negative electrode tab is electrically connected to the negative electrode sheet, and the second part of the negative electrode tab covers the outside of the winding core and is electrically connected to the outer shell.

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

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

16. The battery according to any one of claims 1 to 6, characterized in that, It also includes a positive electrode post and a positive electrode connecting piece, the positive electrode post extending axially out of the outer shell; the positive electrode connecting piece is electrically connected to the positive electrode post through the positive electrode tab, and the negative electrode connecting 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 pin of the positive electrode connecting piece to the connection position with the positive electrode post is a conductor segment, 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 included angle, both of which are straight edge edges.

17. The battery according to claim 16, characterized in that, The arc segment includes an inwardly concave arc segment and an outwardly convex arc segment connected sequentially 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°.

18. The battery according to claim 16, characterized in that, The arc segment is an arc connecting the first side edge and the second side edge, or the arc segment includes multiple arc segments connecting 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°.

19. The battery according to claim 16, characterized in that, An insulating layer is provided between the positive electrode connector and the end face of the outer casing, and an insulating layer is provided between the positive electrode post and the outer casing.

20. An electronic device, characterized in that, It includes 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 19.

21. The electronic device according to claim 20, characterized in that, The load device is a horn.

Images