Battery and electronic equipment

Abstract

The utility model provides a battery and electronic equipment, and relates to the technical field of energy storage. The battery comprises a shell and a roll core main body, the roll core main body is positioned in the accommodating cavity of the shell; the shell comprises a bottom shell and a top cover assembly, the bottom shell comprises a bottom wall and an annular side wall which are connected, the bottom wall and the annular side wall define a containing cavity, the side, away from the bottom wall, of the annular side wall is provided with an opening, the top cover assembly covers the opening, and at least part of the top cover assembly is electrically insulated from the bottom shell; a liquid injection hole is formed in the bottom wall and is communicated with the accommodating cavity; a sealing piece covers the liquid injection hole; the roll core body comprises a first pole piece and a second pole piece, the second pole piece is located on the outer side of the first pole piece, and the first pole piece and the second pole piece are opposite in polarity. The first tab is connected to the first pole piece, and the second tab is connected to the second pole piece; and the sum of the lengths of the first pole piece and the first tab is equal to the sum of the lengths of the second pole piece and the second tab. The battery has low interference on a magnetic sensitive element in the electronic equipment.

Description

Technical Field

[0001] This application relates to the field of energy storage technology, and more particularly to a battery and electronic device. Background Technology

[0002] With the rapid development of electronic devices, background noise has become a common problem, especially in acoustic devices. Background noise, also known as local noise, refers to a basic noise level present in a circuit, system, or environment. Background noise is detrimental to equipment, so it is necessary to reduce it.

[0003] Most background noise originates from the battery. Related technologies address this by incorporating noise-canceling structures around the battery. However, button batteries are typically housed in small, high-precision electronic devices with strict space constraints, such as true wireless stereo (TWS) earbuds. Due to space limitations within the earbuds, noise-canceling devices cannot be installed; therefore, the noise issue must be addressed within the battery itself. Utility Model Content

[0004] This application provides a battery and an electronic device. By designing the structure of the winding core in the battery, the magnetic field generated by the winding core during operation is reduced, thereby reducing the interference of the winding core in the battery on the magnetically sensitive components in the electronic device and improving the working accuracy and quality of the electronic device.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A first aspect of this application provides a battery comprising: a housing and a core body; the core body being located within a receiving cavity of the housing; the housing comprising a bottom shell and a top cover assembly, the bottom shell comprising a connected bottom wall and an annular side wall, the bottom wall and the annular side wall surrounding to form the receiving cavity, the annular side wall having an opening on a side away from the bottom wall, the top cover assembly covering the opening, and at least a portion of the top cover assembly being electrically insulated from the bottom shell;

[0007] The bottom wall is provided with a liquid injection hole, which is connected to the accommodating cavity; the liquid injection hole is covered with a sealing element.

[0008] The core body includes a first electrode and a second electrode, the second electrode being located outside the first electrode, and the first electrode and the second electrode having opposite polarities;

[0009] A first electrode tab and a second electrode tab, wherein the first electrode tab is connected to the first electrode plate and the second electrode tab is connected to the second electrode plate;

[0010] The sum of the lengths of the first electrode and the first tab is equal to the sum of the lengths of the second electrode and the second tab.

[0011] In one possible implementation, the first electrode and the second electrode are wound together to form the core body;

[0012] Along the winding direction of the core body, the second electrode includes a portion extending beyond the tail end of the first electrode;

[0013] The length of the first electrode tab is greater than the length of the second electrode tab.

[0014] In one possible implementation, the difference between the length of the portion of the second electrode extending beyond the tail end of the first electrode and the length of the first electrode tab that is greater than the length of the second electrode tab is less than 6 mm.

[0015] In one possible implementation, along the radial direction of the core body, the portion of the second pole piece extending beyond the tail end of the first pole piece at least partially overlaps with the projection of the first pole tab.

[0016] In one possible implementation, the first electrode tab includes a first connecting segment and an arc-shaped segment, the first connecting segment being connected to the first electrode sheet, the arc-shaped segment being connected to the first connecting segment, the arc-shaped segment extending radially along the core body, and the projection of the arc-shaped segment at least partially overlapping the portion of the second electrode sheet extending beyond the tail end of the first electrode sheet.

[0017] In one possible implementation, the arc segment includes an arc sub-segment and a fixed segment, one end of the arc sub-segment is connected to the first connecting segment, the other end of the arc sub-segment is connected to the fixed segment, and the fixed segment is connected to the top cover assembly.

[0018] In one possible implementation, the first electrode tab includes a second connecting segment and a bent segment, the second connecting segment being connected to the first electrode, the bent segment being connected to the second connecting segment, and the projection of the bent segment at least partially overlapping the portion of the second electrode that extends beyond the tail end of the first electrode.

[0019] In one possible implementation, the bending segment includes a first arc segment and a first straight segment, one end of the first arc segment is connected to the second connecting segment, the other end of the first arc segment is connected to the first straight segment, and the first arc segment extends circumferentially along the core body.

[0020] In one possible implementation, along the height direction of the core body, the angle between the projection of the second tab onto the plane where the first tab is located and the first straight segment is 180 degrees.

[0021] In one possible implementation, the second tab includes a rectangular segment, one end of the second electrode has a first empty foil area, one end of the rectangular segment is connected to the first empty foil area, and the other end of the rectangular segment extends radially along the core body.

[0022] In one possible implementation, along the length of the first electrode, a second empty foil area is provided in the middle of the first electrode, and the first electrode tab is connected to the second empty foil area;

[0023] And / or, along the length of the second electrode, a third empty foil area is provided in the middle of the second electrode, and the second electrode tab is connected to the third empty foil area.

[0024] In one possible implementation, the top cover assembly includes a metal ring and a top cover, the metal ring being connected to the sidewall, the top cover being located on the side of the metal ring near the bottom wall, and the top cover being connected to the metal ring via an insulating ring.

[0025] In one possible implementation, the surface of the top cover away from the accommodating cavity is provided with a boss, and different parts of the boss are respectively inserted into the metal ring and the insulating ring.

[0026] The battery provided in the first aspect of this application has at least the following beneficial effects:

[0027] By designing the internal core of the battery, specifically controlling the length of the first tab connected to the first electrode to be greater than the length of the second tab connected to the second electrode, the sum of the lengths of the first electrode and the first tab is equal to the sum of the lengths of the second electrode and the second tab. This eliminates the alien magnetic field caused by the unequal lengths of the two electrodes and tabs on the core. This ensures that the magnetically sensitive elements of electronic devices using the above-mentioned battery are not affected by additional magnetic fields, improving the working accuracy and quality of the electronic devices. At the same time, by changing the core structure to eliminate the magnetic field, there is no need for additional magnetic shielding materials and magnetic shielding peripheral equipment, reducing the structural complexity of the electronic devices and improving the internal space utilization of the electronic devices, which is conducive to the miniaturization design of electronic devices.

[0028] A second aspect of this application provides an electronic device including a battery provided by any of the technical solutions in the first aspect.

[0029] The battery and electronic device provided in the second aspect of this application have all the beneficial effects of the battery provided in the first aspect of this application, which will not be repeated here. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 A schematic diagram of the structure of a battery with a first tab (C-type) provided for an embodiment of this application;

[0032] Figure 2 A schematic diagram of the structure of the first electrode tab (C-type) and the first electrode plate connected in an embodiment of this application;

[0033] Figure 3 A schematic diagram of the structure of a battery with a first tab (S-type) provided for an embodiment of this application;

[0034] Figure 4 A schematic diagram of the structure of the connected second electrode (S-type) and first electrode plate provided in an embodiment of this application;

[0035] Figure 5 A schematic diagram of a battery with a second tab (type C) provided for an embodiment of this application;

[0036] Figure 6 A schematic diagram of the structure of the connected second electrode lug (type C) and second electrode plate provided in an embodiment of this application;

[0037] Figure 7 A schematic diagram of the structure of a battery with a second tab (S-type) provided for an embodiment of this application;

[0038] Figure 8 A schematic diagram of the structure of the connected second electrode lug (S-type) and second electrode plate provided in an embodiment of this application;

[0039] Figure 9 This is a schematic diagram of the battery structure provided in an embodiment of this application.

[0040] Explanation of reference numerals in the attached figures:

[0041] 100. Core body; 110. First center plane;

[0042] 200, First electrode; 210, Second empty foil region;

[0043] 300. Second electrode; 310. First empty foil region; 320. Third empty foil region;

[0044] 400. First pole ear;

[0045] 410. First connecting segment;

[0046] 420. Arc-shaped segment; 421. Arc-shaped sub-segment; 422. Fixed segment;

[0047] 430. Second connecting section;

[0048] 440. Bending segment; 441. First arc segment; 442. First straight segment;

[0049] 500. Second pole piece; 510. Rectangular segment;

[0050] 10. Housing; 20. Top cover assembly; 21. Metal ring; 21a. Through hole;

[0051] 22. Insulating ring; 23. Top cover;

[0052] 24. Boss; 24a. Injection hole; 25. Sealing part.

[0053] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0054] As described in the background section, with the rapid development of electronic devices, background noise has become a common problem, especially in acoustic devices. Background noise, also known as ambient noise or local noise, refers to a fundamental noise level present in a circuit, system, or environment. Background noise is detrimental to devices, thus necessitating its reduction. Most background noise originates from the battery, and related technologies address this by incorporating noise reduction structures around the battery. However, button batteries are typically installed in small, high-precision electronic devices with strict space constraints, such as TWS earphones. Due to space limitations, noise reduction devices cannot be installed, therefore, the noise problem must be addressed within the battery itself.

[0055] The inventors discovered that current wound-type battery cells, due to the use of positive or negative electrode sheets for the end capping, result in inconsistent current collector lengths. This leads to differences in the magnetic fields generated by the positive and negative electrodes, causing the battery cell as a whole to exhibit a weak electromagnetic field. This electromagnetic field can interfere with magnetically sensitive components, such as the speaker components of Bluetooth headsets, creating noise or interference. Therefore, there is an urgent need to design a magnetically interference-free battery to improve the performance of magnetically sensitive precision components.

[0056] To address the aforementioned technical problems, this application provides a battery. Specifically, through the structural design of the battery's internal core, the length of the first tab connected to the first electrode is controlled to be greater than the length of the second tab connected to the second electrode, so that the sum of the lengths of the first electrode and the first tab equals the sum of the lengths of the second electrode and the second tab. This eliminates the heterogeneous magnetic field generated by the unequal lengths of the two electrodes and tabs on the core. This ensures that the magnetically sensitive elements of electronic devices using the aforementioned battery are not affected by additional magnetic fields, improving the working accuracy and quality of the electronic devices. Simultaneously, by modifying the core structure to eliminate the magnetic field, there is no need for additional magnetic shielding materials or external magnetic shielding equipment, reducing the structural complexity of the electronic devices and improving the utilization rate of internal space, which is beneficial for miniaturized design of the electronic devices.

[0057] To make the above-mentioned objectives, features, and advantages of the embodiments of this application more apparent and understandable, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0058] Combination Figures 1 to 9 The battery provided in this application embodiment includes: a housing 10 and a core body 100; the core body 100 is located within the accommodating cavity of the housing 10; the housing 10 includes a bottom shell and a top cover assembly, the bottom shell including a connected bottom wall and an annular side wall, the bottom wall and the annular side wall surrounding to form the accommodating cavity, the annular side wall having an opening on the side away from the bottom wall, the top cover assembly sealing the opening, at least a portion of the top cover assembly being electrically insulated from the bottom shell; a liquid injection hole 24a is provided on the bottom wall, the liquid injection hole 24a communicating with the accommodating cavity; the liquid injection hole 24a The top cover is sealed with a sealing piece 25; the core body 100 includes a first electrode 200 and a second electrode 300, the second electrode 300 is located outside the first electrode 200, and the polarities of the first electrode 200 and the second electrode 300 are opposite; a first electrode tab 400 and a second electrode tab 500, the first electrode tab 400 is connected to the first electrode 200, and the second electrode tab 500 is connected to the second electrode 300; the sum of the lengths of the first electrode 200 and the first electrode tab 400 is equal to the sum of the lengths of the second electrode 300 and the second electrode tab 500.

[0059] In this way, by designing the internal core structure of the battery, specifically controlling the length of the first tab 400 connected to the first electrode 200 to be greater than the length of the second tab 500 connected to the second electrode 300, the sum of the lengths of the first electrode 200 and the first tab 400 is equal to the sum of the lengths of the second electrode 300 and the second tab 500. This eliminates the alien magnetic field caused by the different lengths of the two electrodes and tabs on the core. This allows the magnetically sensitive elements of electronic devices using the above-mentioned battery to be free from interference from additional magnetic fields, improving the working accuracy and quality of the electronic devices. At the same time, by changing the core structure to eliminate the magnetic field, there is no need for additional magnetic shielding materials and magnetic shielding peripheral equipment, reducing the structural complexity of the electronic devices and improving the internal space utilization of the electronic devices, which is conducive to the miniaturization design of electronic devices.

[0060] In some possible embodiments, the first electrode 200 is a positive electrode 23 and the second electrode 300 is a negative electrode. In other embodiments, the first electrode 200 is a negative electrode and the second electrode 300 is a positive electrode 23.

[0061] In some embodiments, the first electrode 200 and the second electrode 300 are wound to form a core body 100; along the winding direction of the core body 100, the second electrode 300 includes a portion extending beyond the tail end of the first electrode 100; the length of the first electrode tab 200 is greater than the length of the second electrode tab 500300, for example, the first electrode 200 is a positive electrode and the second electrode 300 is a negative electrode.

[0062] In this way, the portion of the second electrode 300 that exceeds the first negative magnetic field will generate the first negative magnetic field, and the portion of the first electrode 400 that is longer than the second electrode 500 will generate the second positive magnetic field. The direction of the second positive magnetic field is opposite to that of the first negative magnetic field. The second positive magnetic field cancels out the first negative magnetic field, thus achieving the effect of demagnetization.

[0063] In some embodiments, the difference between the length of the portion of the second electrode 300 extending beyond the tail end of the first electrode 200 and the length of the first tab 400 exceeding the length of the second tab 500 is less than 6 mm, thus ensuring that the first negative magnetic field is just offset without generating a new magnetic field.

[0064] In some embodiments, along the radial direction of the core body 100, the portion of the second pole piece 300 extending beyond the tail end of the first pole piece 200 at least partially overlaps with the projection of the first pole tab 200. The first pole tab 400 includes a first connecting segment 410 and an arc segment 420. The first connecting segment 410 is connected to the first pole piece 200, and the arc segment 420 is connected to the first connecting segment 410. The arc segment 420 extends radially along the core body 100, and the projection of the arc segment 420 at least partially overlaps with the projection of the portion of the second pole piece 300 extending beyond the tail end of the first pole piece 200. For example, the first pole piece 200 is a positive pole, and the second pole piece 300 is a negative pole. The negative pole covers the outside of the positive pole, and the length of the negative pole piece is greater than that of the positive pole. The magnetic field of the negative pole piece is greater than that of the positive pole piece. Through the structural design of the first pole tab 400, the sum of the lengths of the first pole tab 400 and the first pole piece 200 is equal to the sum of the lengths of the second pole tab 500 and the second pole piece 300, thus canceling out the magnetic field difference between the positive and negative poles.

[0065] It should be noted that, in this embodiment, along the axial direction of the core body 100, the projection of the first tab 400 on the plane where the second tab 500 is located is approximately C-shaped.

[0066] In some embodiments, the arc segment 420 includes an arc sub-segment 421 and a fixed segment 422. One end of the arc sub-segment 421 is connected to the first connecting segment 410, and the other end of the arc sub-segment 421 is connected to the fixed segment 422. The fixed segment 422 extends in a direction perpendicular to the first center plane 110 and is connected to the top cover assembly.

[0067] In this way, through the irregularly extended first tab 400 structure design of the above embodiment, compared with the traditional rectangular tab structure, the change in the shape of the tab can block the magnetic field generated by the different lengths of the two tabs. That is, by increasing the spatial volume of the tab and the radial cross-sectional area along the core body 100, the magnetic field can be blocked.

[0068] In some embodiments, the first tab 400 includes a second connecting segment 430 and a bending segment 440, the second connecting segment 430 being connected to the first electrode 200, the bending segment 440 being connected to the second connecting segment 430, and the projection of the bending segment and the portion of the second electrode extending beyond the tail end of the first electrode at least partially overlaps.

[0069] In some embodiments, the bending segment 440 includes a first arc segment 441 and a first straight segment 442. One end of the first arc segment 441 is connected to the second connecting segment 430, and the other end of the first arc segment 441 is connected to the first straight segment 442. The first arc segment 441 extends circumferentially along the core body 100.

[0070] It should be noted that, in this embodiment, along the axial direction of the core body 100, the projection of the first tab 400 on the plane where the second tab 500 is located is approximately S-shaped.

[0071] In some embodiments, along the height direction of the core body 100, the angle between the projection of the second tab 500 onto the plane where the first tab 400 is located and the first straight segment 442 is 180 degrees. This design provides a larger blocking area for the magnetic field generated by the first pole piece 200 and the second pole piece 300 along the axial direction of the core body 100, resulting in better electromagnetic shielding.

[0072] In some embodiments, the second tab 500 includes a rectangular segment 510, one end of the second electrode 300 has a first empty foil area 310, one end of the rectangular segment 510 is connected to the first empty foil area 310, and the other end of the rectangular segment 510 extends radially along the core body 100.

[0073] In some embodiments, along the length direction of the first electrode 200, a second empty foil region 210 is provided in the middle of the first electrode 200, and the first electrode tab 400 is connected to the second empty foil region 210.

[0074] Alternatively, along the length of the second electrode 300, a third empty foil region 320 is provided in the middle of the second electrode 300, and the second electrode tab 500 is connected to the third empty foil region 320.

[0075] In other embodiments, along the length direction of the first electrode 200, a second empty foil area 210 is provided in the middle of the first electrode 200, and a first electrode tab 400 is connected to the second empty foil area 210. Furthermore, along the length direction of the second electrode 300, a third empty foil area 320 is provided in the middle of the second electrode 300, and a second electrode tab 500 is connected to the third empty foil area 320.

[0076] With this configuration, when the sum of the lengths of the first pole piece 200 and the first tab 400 and the sum of the lengths of the second pole piece 300 and the second tab 500 are equal, not only is the generation of additional magnetic fields reduced, but the use of a centrally located tab structure can also reduce the internal resistance of the winding core.

[0077] In some embodiments, combined with Figure 9 The top cover assembly 20 includes a metal ring 21 and a top cover 23. The metal ring 21 is connected to the side wall, and the top cover 20 is located on the side of the metal ring 21 near the bottom wall. The top cover 23 is connected to the metal ring 21 through an insulating ring 22. Furthermore, a boss is provided on the surface of the top cover 20 away from the accommodating cavity, and different parts of the boss are respectively inserted into the metal ring 21 and the insulating ring.

[0078] Specifically, the metal ring 21 is made of metal and is welded to the shell 10. The metal ring 21 serves as the negative electrode of the battery, the insulating ring 22 is disposed on the upper surface of the metal ring 21, and the cover plate 23 serves as the positive electrode of the battery. That is, the cover plate 23, which serves as the positive electrode, is insulated and isolated from the metal ring 21, which serves as the negative electrode, by the insulating ring 22.

[0079] The metal ring 21 has a first through hole 21a in its middle, and the insulating ring 22 also has a second through hole 21a corresponding to the first through hole 21a. The positive electrode plate 23 has a boss 24 in its middle, which is inserted into the through hole 21a, so that the boss 24 faces the inner cavity of the housing 10. The positive electrode of the core is connected to the boss 24 through a positive electrode lug. The lower surface of the metal ring 21 is covered with insulating adhesive to insulate the positive electrode lug of the core from the metal ring 21. The negative electrode of the core is connected to the housing 10 through a negative electrode lug. Furthermore, the boss 24 is provided with a liquid injection hole 24a, and the sealing member 25 is welded to the positive electrode plate 23 to seal the liquid injection hole 24a.

[0080] In this way, compared to setting an adapter plate on the top cover to isolate the magnetic field generated by the core, the battery structure can cancel and shield the additional magnetic field through its own structure, eliminating the need for an adapter plate, simplifying the structure and saving costs.

[0081] Secondly, embodiments of this application provide an electronic device, which includes a device body and a battery provided in any embodiment of the second aspect, wherein the battery is electrically connected to the device body.

[0082] For example, the main body of the device includes, but is not limited to, electric vehicles, electric aircraft, mobile phones, tablets, laptops, ultra-mobile personal computers (UMPCs), handheld computers, walkie-talkies, IPTVs, televisions, in-vehicle equipment, netbooks, POS machines, personal digital assistants (PDAs), wearable devices (such as smartwatches, smart bracelets, virtual reality devices, and other mobile or fixed terminals with display devices).

[0083] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0084] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0085] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0086] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0087] The various embodiments or implementation methods described in this specification are presented in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referred to each other.

[0088] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A battery, characterized in that, include: A housing and a core body; the core body is located within the receiving cavity of the housing; the housing includes a bottom shell and a top cover assembly, the bottom shell including a connected bottom wall and an annular side wall, the bottom wall and the annular side wall surrounding to form the receiving cavity, the annular side wall having an opening on the side away from the bottom wall, the top cover assembly sealing the opening, at least a portion of the top cover assembly being electrically insulated from the bottom shell; The bottom wall is provided with a liquid injection hole, which is connected to the accommodating cavity; the liquid injection hole is covered with a sealing element. The core body includes a first electrode and a second electrode, the second electrode being located outside the first electrode, and the first electrode and the second electrode having opposite polarities; A first electrode tab and a second electrode tab, wherein the first electrode tab is connected to the first electrode plate and the second electrode tab is connected to the second electrode plate; The sum of the lengths of the first electrode and the first tab is equal to the sum of the lengths of the second electrode and the second tab.

2. The battery according to claim 1, characterized in that, The first electrode and the second electrode are wound together to form the core body; Along the winding direction of the core body, the second electrode includes a portion extending beyond the tail end of the first electrode; The length of the first electrode tab is greater than the length of the second electrode tab.

3. The battery according to claim 2, characterized in that, The difference between the length of the portion of the second electrode extending beyond the tail end of the first electrode and the length of the first electrode tab that is greater than the length of the second electrode tab is less than 6 mm.

4. The battery according to claim 2, characterized in that, Along the radial direction of the core body, the portion of the second pole piece extending beyond the tail end of the first pole piece at least partially overlaps with the projection of the first pole tab.

5. The battery according to claim 4, characterized in that, The first electrode tab includes a first connecting segment and an arc-shaped segment. The first connecting segment is connected to the first electrode sheet, and the arc-shaped segment is connected to the first connecting segment. The arc-shaped segment extends radially along the core body, and the projection of the arc-shaped segment at least partially overlaps with the projection of the portion of the second electrode sheet that extends beyond the tail end of the first electrode sheet.

6. The battery according to claim 5, characterized in that, The arc-shaped segment includes an arc-shaped sub-segment and a fixed segment. One end of the arc-shaped sub-segment is connected to the first connecting segment, and the other end of the arc-shaped sub-segment is connected to the fixed segment. The fixed segment is connected to the top cover assembly.

7. The battery according to claim 4, characterized in that, The first electrode tab includes a second connecting segment and a bent segment. The second connecting segment is connected to the first electrode plate, and the bent segment is connected to the second connecting segment. The projection of the bent segment and the portion of the second electrode plate extending beyond the tail end of the first electrode plate at least partially overlaps.

8. The battery according to claim 7, characterized in that, The bending section includes a first arc segment and a first straight segment. One end of the first arc segment is connected to the second connecting segment, and the other end of the first arc segment is connected to the first straight segment. The first arc segment extends circumferentially along the core body.

9. The battery according to claim 8, characterized in that, Along the height direction of the core body, the angle between the projection of the second electrode tab onto the plane where the first electrode tab is located and the first straight segment is 180 degrees.

10. The battery according to claim 8, characterized in that, The second electrode tab includes a rectangular segment, one end of the second electrode sheet has a first empty foil area, one end of the rectangular segment is connected to the first empty foil area, and the other end of the rectangular segment extends radially along the core body.

11. The battery according to any one of claims 1-8, characterized in that, Along the length of the first electrode, a second empty foil area is provided in the middle of the first electrode, and the first electrode tab is connected to the second empty foil area; And / or, along the length of the second electrode, a third empty foil area is provided in the middle of the second electrode, and the second electrode tab is connected to the third empty foil area.

12. The battery according to any one of claims 1-8, characterized in that, The top cover assembly includes a metal ring and a top cover. The metal ring is connected to the side wall, and the top cover is located on the side of the metal ring near the bottom wall. The top cover and the metal ring are connected by an insulating ring.

13. The battery according to claim 12, characterized in that, The surface of the top cover away from the accommodating cavity is provided with a boss, and different parts of the boss are respectively inserted into the metal ring and the insulating ring.

14. An electronic device, characterized in that, Includes the battery as described in any one of claims 1-13.

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