Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery, a shell is provided with a containing cavity and an opening communicated with the containing cavity, a pole core is arranged in the containing cavity, an end cover structure seals the opening, and the end cover structure comprises a first cover plate, a second cover plate and an insulation structure, the second cover plate and the first cover plate are arranged in a stacked mode, one of the first cover plate and the second cover plate forms a positive electrode connecting part, the other one of the first cover plate and the second cover plate forms a negative electrode connecting part, and the insulation structure is located between the positive electrode connecting part and the negative electrode connecting part and forms insulation. At least one of the positive electrode connecting part and the negative electrode connecting part comprises an arc-shaped structure, and the arc-shaped structure and the pole core are concentrically arranged. The structure of the battery can be effectively simplified, and the assembling difficulty of the battery is reduced.

Description

Technical Field

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

[0002] Currently, cylindrical batteries used in wireless headphones generate interfering magnetic fields at their cores when powered on, which can negatively impact the headphone's speaker performance. To address this issue, auxiliary structures are needed on the cylindrical batteries. When current flows through these structures, they generate an auxiliary magnetic field to counteract the interfering magnetic field, thus eliminating its effect on the headphone speaker. However, these auxiliary structures not only complicate the cylindrical battery's structure but also require precise angular alignment with the cores. Otherwise, they may fail to counteract the interfering magnetic field and could even trigger secondary interference. This arrangement requirement further complicates the assembly of the cylindrical batteries. Utility Model Content

[0003] This application provides a battery that can effectively simplify the battery's structure and reduce the difficulty of battery assembly while eliminating interfering magnetic fields.

[0004] One aspect of this application provides a battery, comprising:

[0005] The device includes a housing, an electrode core, and an end cap structure. The housing has a receiving cavity and an opening communicating with the receiving cavity. The electrode core is disposed within the receiving cavity, and the end cap structure seals the opening.

[0006] The end cap structure includes:

[0007] First cover plate;

[0008] A second cover plate is stacked on top of the first cover plate. One of the first cover plate and the second cover plate has a positive electrode connection portion, and the other of the first cover plate and the second cover plate has a negative electrode connection portion.

[0009] And an insulating structure, the insulating structure being located between the positive electrode connection portion and the negative electrode connection portion and forming insulation, at least one of the positive electrode connection portion and the negative electrode connection portion including an arc-shaped structure, the arc-shaped structure being concentrically arranged with the electrode core.

[0010] The electrode core includes a first electrode sheet and a second electrode sheet, which are stacked and wound to form a core structure. The first electrode sheet includes an extension portion that extends beyond the second electrode sheet along the winding direction.

[0011] The extension direction of the arc-shaped structure is the same as the extension direction of the core structure, or the extension direction of the arc-shaped structure is opposite to the extension direction of the core structure.

[0012] In this embodiment of the battery, the positive and negative electrode connections formed by the first and second cover plates simplify the design of the sealing structure. Only an insulating structure that provides insulation and sealing is needed between the positive and negative electrode connections. The arc-shaped structure integrated into the positive or negative electrode connection provides the end cap structure itself with the ability to counteract interfering magnetic fields, simplifying the structure's composition. When this end cap structure is applied to the battery, it has a defined angular relationship with the electrode core after being mounted on the casing, simplifying battery assembly. Furthermore, since the first electrode extends beyond the second electrode, it can fully cover the second electrode, thereby increasing the battery's energy density. By projecting the portion extending beyond the second electrode and the arc-shaped structure as described above, the magnetic field generated by the arc-shaped structure and the magnetic field generated by the extended portion are opposite, thus canceling each other out and suppressing the generation of interfering magnetic fields.

[0013] In one possible implementation, the polarity of the arc-shaped structure is the same as the polarity of the first electrode, or

[0014] The polarity of the arc-shaped structure is the same as that of the first electrode.

[0015] In one possible implementation, the first cover plate is sealed to the housing, the second cover plate is located below or above the first cover plate, and the arcuate structure is formed on the first cover plate or the second cover plate.

[0016] In one possible implementation, the insulating structure is disposed between the first cover plate and the second cover plate.

[0017] In one possible implementation, the first cover plate and the insulating structure form a lead-out channel, from which the positive electrode connection extends. The first cover plate, the second cover plate, and the insulating structure form an overlapping section around the lead-out channel, the length L1 of which satisfies the following relationship:

[0018] L1 > 0.5 mm.

[0019] In one possible implementation, the arc-shaped structure includes an arc segment with a central angle of 90° to 270°.

[0020] In one possible implementation, at least one arcuate slot is formed on the first cover plate, and the area enclosed by the arcuate slot forms the arcuate structure.

[0021] In one possible implementation, the first cover plate has an arc-shaped slot, the first cover plate has a first through hole, the arc-shaped slot is arranged around the first through hole, and the arc-shaped structure is formed between the arc-shaped slot and the first through hole.

[0022] In one possible implementation, two of the arc-shaped slots are formed on the first cover plate, and an arc-shaped structure is formed between the two arc-shaped slots.

[0023] In one possible implementation, the arc-shaped slot is formed on the edge of the first cover plate, the arc-shaped slot isolating the edge portion of the first cover plate and forming the arc-shaped structure.

[0024] In one possible implementation, the first cover plate is further provided with an injection hole, which is located at the center of the first cover plate or at the edge of the first cover plate.

[0025] In one possible implementation, when the injection hole is located at the edge of the first cover plate, the distance L1 between the center of the injection hole and the edge of the first cover plate adjacent to the injection hole satisfies the following relationship:

[0026] L3 > 0.6 mm.

[0027] In one possible implementation, the first cover is made of a first material, which includes at least stainless steel.

[0028] In one possible implementation, the battery further includes:

[0029] A positive electrode adapter piece is connected to the positive electrode connection part;

[0030] And a negative electrode adapter piece, connected to the negative electrode connection portion, wherein at least one of the positive electrode adapter piece and the negative electrode adapter piece extends out of the outer shell and forms a positioning structure. Attached Figure Description

[0031] 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.

[0032] Figure 1 A schematic diagram of the structure of a battery according to an embodiment of this application is shown;

[0033] Figure 2An explosion diagram of a battery according to an embodiment of this application is shown;

[0034] Figure 3 A cross-sectional view of a battery provided according to an embodiment of this application is shown;

[0035] Figure 4 A schematic diagram of another battery structure provided according to an embodiment of this application is shown;

[0036] Figure 5 An explosion diagram of another battery provided according to an embodiment of this application is shown;

[0037] Figure 6 A top view of a battery provided according to an embodiment of this application is shown;

[0038] Figure 7 A top view of another battery provided according to an embodiment of this application is shown;

[0039] Figure 8 A schematic diagram showing the winding direction of a pole core and the extension direction of an arc-shaped structure according to an embodiment of this application is shown;

[0040] Figure 9 A schematic diagram showing the winding direction of another pole core and the extension direction of the arc-shaped structure according to an embodiment of this application is shown;

[0041] Figure 10 An explosion diagram of yet another battery provided according to an embodiment of this application is shown;

[0042] Figure 11 A cross-sectional view of yet another battery provided according to an embodiment of this application is shown;

[0043] Figure 12 A schematic diagram of the structure of another battery provided according to an embodiment of this application is shown;

[0044] Figure 13 A schematic diagram of an arc-shaped structure provided according to an embodiment of this application is shown;

[0045] Figure 14 A schematic diagram of another arc-shaped structure provided according to an embodiment of this application is shown;

[0046] Figure 15 A schematic diagram of another arc-shaped structure provided according to an embodiment of this application is shown.

[0047] Figure label:

[0048] 100 - Outer shell; 101 - Receiving cavity;

[0049] 200 - Core electrode; 210 - Positive electrode tab; 220 - Positive electrode sheet; 230 - Negative electrode sheet;

[0050] 300 - End cap structure; 301 - Positive electrode connection part; 302 - Negative electrode connection part; 310 - First cover plate; 320 - Second cover plate; 330 - Insulation structure; 340 - Liquid injection hole cap; 311 - First through hole; 312 - Arc-shaped groove hole; 313 - Liquid injection hole; 331 - Second through hole;

[0051] 400 - Positive electrode adapter; 410 - Positive electrode connection section; 420 - Positive electrode extension section; 430 - Positive electrode conductive terminal;

[0052] 500 - Negative electrode adapter piece; 510 - Negative electrode connection section; 520 - Negative electrode extension section; 530 - Negative electrode conductive terminal;

[0053] 600-Positioning Structure;

[0054] 700 - Insulation layer; 10 - Arc-shaped structure. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, 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 some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0056] Cylindrical batteries used in electronic devices such as wireless headphones require an adapter to establish electrical connection with the headphones' circuitry. This adapter includes a positive adapter and a negative adapter. The positive adapter is connected to the positive terminal of the cylindrical battery, and the negative adapter is connected to the negative terminal. These adapters are then connected to the positive and negative current terminals in the unused headphones, respectively, thus establishing electrical connection.

[0057] In the aforementioned cylindrical battery operation, due to its specific shape, the core of the cylindrical battery generates an interfering magnetic field that can affect the sound quality of the headphone speaker after the battery is powered on. This interfering magnetic field can negatively impact the performance of the wireless headphones. Therefore, an auxiliary structure can be used to counteract this interfering magnetic field. This auxiliary structure can be set separately or integrated directly into the positive or negative electrode adapter. These auxiliary structures are typically designed with the same winding direction as the core, so that when current flows through the auxiliary structure, it forms an auxiliary magnetic field that can counteract the interfering magnetic field, thereby eliminating its influence on the headphone speaker.

[0058] The design of the aforementioned auxiliary structures, whether set as independent structures or integrated into the positive or negative electrode adapter, will complicate the structure of the cylindrical battery. Moreover, these auxiliary structures need to maintain a stable angular relationship with the electrode core, which will further increase the assembly difficulty of the cylindrical battery.

[0059] Based on the above-mentioned situation and problems, this application provides a battery, which can be a cylindrical battery. Through reasonable structural design and the combination of different structures of the battery itself, the battery can generate an auxiliary magnetic field to counteract the interfering magnetic field, without the need to set up the auxiliary structure in related technologies. This simplifies the structural composition of the battery and also reduces the assembly difficulty of the battery.

[0060] The core of the battery design in this application embodiment lies in optimizing its own structure. For example, the structure of a certain inherent component of the battery can be optimized so that this part of the structure can generate an auxiliary magnetic field to counteract the interfering magnetic field.

[0061] It is understandable that, given the inherent structure of a battery, there is an assembly relationship between the battery casing and the end cap structure. During battery assembly, the end cap structure needs to be installed onto the casing. The casing needs to house the electrode core, providing protection and isolating current from it. The casing also acts as a force-bearing component during transport; for example, when the battery is handled, moved, or transported by a robotic arm, the applied force generally acts directly on the casing. Therefore, the casing is typically designed as a closed structure except for necessary openings. The end cap structure needs to seal these openings and also form an electrical connection with the electrode core. Therefore, battery structural design generally focuses on the end cap structure. Based on these considerations, the embodiments of this application concentrate the design focus on the end cap structure, enabling it to generate the aforementioned auxiliary magnetic field. After the end cap structure is installed onto the casing, a defined angular relationship is formed between the end cap structure and the electrode core, allowing the auxiliary magnetic field to cancel out interfering magnetic fields, resulting in stable performance and simple assembly.

[0062] Figure 1 A schematic diagram of the structure of a battery according to an embodiment of this application is shown; Figure 2 An explosion diagram of a battery according to an embodiment of this application is shown; Figure 3 A cross-sectional view of a battery according to an embodiment of this application is shown. In the embodiments of this application, please refer to... Figures 1 to 3 The battery includes a casing 100, an electrode core 200, and an end cap structure 300.

[0063] The outer casing 100 serves as a protective housing for the battery. To ensure its strength and structural stability, the outer casing 100 can be made of materials such as aluminum or aluminum alloy. The outer casing 100 can be manufactured by stamping or integral injection molding. The outer casing 100 has a receiving cavity 101 and an opening communicating with the receiving cavity 101. The outer casing 100 can be constructed in a cylindrical shape, specifically, a cylindrical structure open at one end. In other embodiments, the outer casing 100 can also be constructed in other structures.

[0064] The electrode core 200 is disposed within the receiving cavity 101. The electrode core 200 can adopt a wound structure, and is formed by winding a positive electrode sheet, a separator, and a negative electrode sheet into a cylindrical shape. It is understandable that the electrode core 200 has different hierarchical structures depending on the winding direction. For example, in some cases, when the winding direction is clockwise, the outermost layer of the electrode core 200 may be the positive electrode sheet 220 (see reference...). Figure 9 When the winding direction is counterclockwise, the outermost layer of the electrode core 200 may be the negative electrode sheet 230 (see reference). Figure 8 Therefore, after the pole core 200 is powered on, the directions of the interfering magnetic fields generated by the pole core 200 are different, which makes it impossible for the magnetic fields generated by the pole core 200 to cancel each other out, thus causing electromagnetic interference; in order to cancel out this difference, some parts of the end cap structure 300 need to be adapted.

[0065] To achieve electrical connection between the electrode core 200 and the end cap structure 300, the electrode core 200 is also provided with a positive electrode tab 210 and a negative electrode tab. The positive electrode tab 210 and the negative electrode tab can be located at both ends of the electrode core 200. The positive electrode tab 210 is connected to the positive electrode plate 220, and the negative electrode tab is connected to the negative electrode plate 230. Correspondingly, to achieve connection between the end cap structure 300 and the electrode core 200, the end cap structure 300 is provided with a positive electrode connection part 301 and a negative electrode connection part 302. The positive electrode connection part 301 is connected to the positive electrode tab 210, and the negative electrode connection part 302 is connected to the negative electrode tab.

[0066] In the above description, it should be noted that in some cases, the end cap structure 300 can serve as the positive terminal of the battery and be connected to the positive tab 210, the bottom of the outer casing 100 can serve as the negative terminal of the battery and be connected to the negative tab, the positive connection portion 301 can serve as the positive terminal of the battery, the positive adapter piece 400 can be connected to the positive connection portion 301, and the negative adapter piece 500 can be connected to the negative terminal. In the above cases, the negative tab needs to be connected to both the bottom of the outer casing 100 and the negative connection portion 302 in the end cap structure 300. At this time, the negative connection portion 302 can form an independent current path. Based on this current path, the structure of the negative connection portion 302 can be optimized to form the aforementioned auxiliary magnetic field. In the above cases, it is equivalent to opening up an independent current path in the normal connection relationship of the battery. The function of this current path is to cancel out the interference magnetic field additionally generated by the electrode core.

[0067] In other cases, the end cap structure 300 can also serve as both the positive and negative terminals of the battery. In this case, the positive terminal connection 301 is connected to the positive electrode tab 210, and the negative terminal connection 302 is connected to the negative electrode tab. The positive terminal connection 301 can serve as the positive terminal of the battery, and the negative terminal connection 302 can serve as the negative terminal. The positive electrode tab 210 and the negative electrode tab 210 can be structurally optimized so that they can both be connected to the end cap structure 300. In the above cases, one of the positive terminal connection 301 and the negative terminal connection 302 can be optimized to form an auxiliary magnetic field in the current path that can cancel out the interfering magnetic field. In the above cases, it is equivalent to localizing the original current path, so that the local current path has the effect of canceling out the interfering magnetic field.

[0068] In this embodiment, the end cap structure 300 is mainly optimized to form the aforementioned auxiliary magnetic field. It is understood that the overall positive and negative electrode design of the battery is not limited, and the positive and negative electrodes can be located at both ends of the battery. Of course, based on the structural optimization of the end cap structure 300 in this application, the positive and negative electrodes can also be integrated on the end cap structure 300 simultaneously.

[0069] The battery in this embodiment of the application, based on the optimized design of the end cap structure 300, enables the battery itself to cancel out the interfering magnetic field, and is also easy to assemble.

[0070] The following embodiments will primarily focus on the second scenario described above, where the positive and negative terminals of the battery are located at one end of the battery (of course, the positive and negative terminals can also be located at both ends of the battery). In this case, both the positive electrode tab 210 and the negative electrode tab need to be connected to the end cap structure 300, allowing for optimization of one of the positive electrode connection portion 301 and the negative electrode connection portion 302. The advantage of designing the battery using this second scenario is that when the battery in this embodiment is used in electronic devices such as wireless headphones, it is convenient to provide the positive electrode adapter 400 and the negative electrode adapter 500 at the same end of the battery, so that the battery can be installed in the electronic device such as a wireless headphone.

[0071] Figure 4 A schematic diagram of another battery structure provided according to an embodiment of this application is shown; Figure 5 An explosion diagram of another battery provided according to an embodiment of this application is shown.

[0072] In some embodiments, please refer to Figure 4 and Figure 5 The battery also includes a positive electrode adapter 400 and a negative electrode adapter 500, which are located at the same end of the battery. The positive electrode adapter 400 is connected to the positive electrode connection portion 301 in the end cover structure 300, and the negative electrode adapter 500 is connected to the negative electrode connection portion 302 in the end cover structure 300. At least one of the positive electrode adapter 400 and the negative electrode adapter 500 extends out of the outer shell 100 and forms a positioning structure 600.

[0073] In this embodiment, the positive electrode adapter 400 and the negative electrode adapter 500 serve as current lead-out structures for the battery, designed to establish an electrical connection with electronic devices. The shape of the positive electrode adapter 400 and the negative electrode adapter 500 is not limited; for example, they can be designed as straight structures or simple bent structures, facilitating manufacturing and molding. The positioning structure 600 formed on the positive electrode adapter 400 or the negative electrode adapter 500 can position the battery for installation, making it easy to insert the battery into electronic devices.

[0074] In some embodiments, please refer to Figure 4 and Figure 5The negative electrode adapter 500 includes a negative electrode connection section 510 and a negative electrode extension section 520. The negative electrode connection section 510 is used to connect to the negative electrode connection part 302. It needs to be designed according to the specific structure of the negative electrode connection part 302. For example, as can be seen from the following description of the end cap structure 300, the negative electrode connection part 302 can be in the form of an arc-shaped structure 10. Correspondingly, the negative electrode connection section 510 can be designed as an arc shape. The negative electrode extension section 520 extends outward from both ends of the negative electrode connection section 510. One of its extended ends can serve as a negative electrode conductive end 530 to connect with the negative electrode current end in the electronic device. The other end can extend out of the housing 100 to form a positioning structure 600, or it can remain outside the housing 100.

[0075] In some embodiments, please refer to Figure 4 and Figure 5 The positive electrode connector 400 includes a positive electrode connector section 410 and a positive electrode extension section 420. The positive electrode connector section 410 is used to connect to the positive electrode connector 301, and its design needs to be based on the specific structure of the positive electrode connector 301. For example, as can be seen from the description of the end cap structure 300 below, the positive electrode connector 301 can be in the form of a columnar structure, and correspondingly, the positive electrode connector section 410 can be designed as a circular structure. The positive electrode extension section 420 extends outward from both ends of the positive electrode connector section 410. One of its extended ends can serve as a positive electrode conductive end 430 to connect with the positive electrode current end in the electronic device, and the other can extend out of the housing 100 to form a positioning structure 600, or it can remain outside the housing 100.

[0076] Understandably, to facilitate the installation of the battery into electronic devices and the establishment of a connection, please refer to... Figure 6 The aforementioned negative electrode extension 520 and positive electrode extension 420 can extend in the same direction to form a negative electrode conductive end 530 and a positive electrode conductive end 430 on the same side.

[0077] It should be noted that the negative electrode adapter 500 and the positive electrode adapter 400 can be interchanged, depending on the specific positions of the positive electrode connection 301 and the negative electrode connection 302. For example, in the above description, the negative electrode connection 302 and the positive electrode connection 301 can be interchanged; that is, the arc-shaped structure 10 can be the negative electrode connection 302, and the columnar structure can be the positive electrode connection 301. Correspondingly, the positive electrode adapter 400 is connected to the arc-shaped structure 10, and the negative electrode adapter 500 is connected to the columnar structure.

[0078] It is understood that this application does not limit the specific shape of the positioning structure 600. For example, the positioning structure 600 can be a continuation of the positive electrode adapter 400 or the negative electrode adapter 500, that is, the positioning structure 600 can be formed by the positive electrode adapter 400 or the negative electrode adapter 500 extending out of the battery casing 100. Alternatively, the positioning structure 600 can also be formed by bending the portion of the positive electrode adapter 400 or the negative electrode adapter 500 extending out of the casing 100 to a certain extent. In addition, the positive electrode adapter 400 and the negative electrode adapter 500 can each form a positioning structure 600, and the two positioning structures 600 can face the same side or face different sides, making it easier for the battery to be installed in electronic devices.

[0079] Figure 6 A top view of a battery provided according to an embodiment of this application is shown; Figure 7 A top view of another battery provided according to an embodiment of this application is shown. In some embodiments, please refer to Figure 6 Both the positive electrode adapter 400 and the negative electrode adapter 500 adopt a simple bending structure. The negative electrode adapter 500 extends beyond the outer shell 100 to form a positioning structure 600, which is a continuation of the negative electrode adapter 500. Please refer to [reference needed]. Figure 7 Both the positive electrode adapter 400 and the negative electrode adapter 500 adopt a simple bending structure. The positive electrode adapter 400 extends out of the outer shell 100 to form a positioning structure 600, which is a continuation of the positive electrode adapter 400.

[0080] It is understandable that in the aforementioned embodiment where the positive electrode adapter 400 and the negative electrode adapter 500 are disposed at the same end of the battery, it is necessary to prevent short circuits and to form insulation between the positive electrode adapter 400 and the negative electrode adapter 500. The insulation between the positive electrode adapter 400 and the negative electrode adapter 500 can be achieved through a first insulation structure.

[0081] In some embodiments, please refer to Figure 5 The battery also includes an insulating layer 700, which is one of the first insulating structures described above. The insulating layer 700 is disposed between the end cap structure 300 and the positive electrode adapter 400, and between the end cap structure 300 and the negative electrode adapter 500. The insulating layer 700 is made of insulating material and can separate the positive electrode adapter 400 and the negative electrode adapter 500.

[0082] In other embodiments, the battery may further include an insulating cover, which is one of the first insulating structures described above. The insulating cover is made of an insulating material and can cover the periphery of the positive electrode adapter 400 or the negative electrode adapter 500 to achieve the purpose of isolating the positive electrode adapter 400 and the negative electrode adapter 500.

[0083] In some other embodiments, the battery further includes an insulating filler layer, which is one of the first insulating structures described above. The insulating filler layer can fill the space between the positive electrode adapter 400 and the negative electrode adapter 500 to achieve the purpose of isolating the positive electrode adapter 400 and the negative electrode adapter 500.

[0084] In some specific embodiments, the insulating layer 700 may be made of insulating adhesive paper, which is thinner and can control the overall size of the battery, making the battery more compact in structure.

[0085] In some embodiments, to improve the insulation effect, the positive electrode adapter 400 and the negative electrode adapter 500 can be located at different heights. For example, the positive electrode connection 301 and the negative electrode connection 302 can be designed to have different heights, so that after the positive electrode adapter 400 and the negative electrode adapter 500 are installed in the corresponding positions, the positive electrode adapter 400 and the negative electrode adapter 500 have different heights.

[0086] For the end cap structure 300, insulation also needs to be formed between the positive electrode connection portion 301 and the negative electrode connection portion 302. Here, you can refer to the description of the end cap structure 300 in the following embodiment. The insulation between the positive electrode connection portion 301 and the negative electrode connection portion 302 can be achieved by a second insulation structure.

[0087] In the embodiments of this application, please refer to Figure 1 and Figure 3 The end cap structure 300 includes a first cover plate 310, a second cover plate 320, and an insulating structure 330.

[0088] The second cover plate 320 is stacked with the first cover plate 310. One of the first cover plate 310 and the second cover plate 320 has a positive electrode connection portion 301, and the other of the first cover plate 310 and the second cover plate 320 has a negative electrode connection portion 302.

[0089] The first cover plate 310 and the second cover plate 320 can be designed to have the same dimensions, that is, the areas of the first cover plate 310 and the second cover plate 320 are the same. To simplify the structure, one of the first cover plate 310 and the second cover plate 320 can be set to be larger, just enough to seal and cover the battery casing 100. In this embodiment, the example of the first cover plate 310 having a larger area than the second cover plate 320 is used for illustration. When the end cap structure 300 is installed on the casing 100, the edge of the first cover plate 310 can form a connection with the casing 100.

[0090] The insulation structure 330 is the aforementioned second insulation structure. The insulation structure 330 is located between the positive electrode connection portion 301 and the negative electrode connection portion 302 and can form insulation and sealing between the positive electrode connection portion 301 and the negative electrode connection portion 302. One of the positive electrode connection portion 301 and the negative electrode connection portion 302 includes an arc-shaped structure 10. The arc-shaped structure 10 is concentrically arranged with the core structure, so that the arc-shaped structure 10 can be adapted to the winding direction of the core 200.

[0091] The first cover plate 310 and the second cover plate 320 are stacked together. To ensure a seal and prevent leakage of liquid (e.g., electrolyte), the insulating structure 330 needs to have sealing performance. One of the first cover plate 310 and the second cover plate 320 has a positive electrode connection portion 301, and the other of the first cover plate 310 and the second cover plate 320 has a negative electrode connection portion 302. To prevent short circuits, the insulating structure 330 needs to have insulating performance.

[0092] As mentioned above, different winding directions of the pole core 200 will result in different outer layer structures of the pole core 200, and will also generate different interference magnetic fields. Therefore, the purpose of matching the extension direction of the arc structure 10 with the winding direction of the pole core 200 is to balance the above-mentioned interference magnetic fields.

[0093] In some embodiments, the polarity of the arc-shaped structure is the same as the polarity of the first electrode, or the polarity of the arc-shaped structure is the same as the polarity of the first electrode.

[0094] Figure 8 A schematic diagram showing the winding direction of a pole core and the extension direction of an arc-shaped structure according to an embodiment of this application is shown; Figure 9 This diagram illustrates the winding direction of another electrode core and the extension direction of the arc-shaped structure according to an embodiment of this application. Please refer to... Figure 8The electrode core 200 is wound in a first direction. The outer layer structure of the electrode core 200 is a negative electrode sheet 230. The arc-shaped structure 10 extends from the outside to the inside along direction A (clockwise). When the arc-shaped structure 10 serves as the negative electrode connection part 302, the direction of the current flowing through the negative electrode connection part 302 is opposite to the winding direction of the electrode core 200, which can cancel the interference magnetic field generated by the electrode core 200. When the arc-shaped structure 10 serves as the positive electrode connection part 301, the direction of the current flowing through the positive electrode connection part 301 is the same as the winding direction of the electrode core 200, which can also cancel the interference magnetic field generated by the electrode core 200. Please refer to... Figure 9 The electrode core 200 is wound in the second direction. The outer layer structure of the electrode core 200 is a positive electrode sheet 220. The arc-shaped structure 10 extends from the right outward and inward along the B direction (counterclockwise). When the arc-shaped structure 10 serves as the positive electrode connection part 301, the direction of the current flowing through the positive electrode connection part 301 is opposite to the winding direction of the electrode core 200, which can cancel the interference magnetic field generated by the electrode core 200. When the arc-shaped structure 10 serves as the negative electrode connection part 302, the current flowing through the negative electrode connection part 302 is in the same way as the winding direction of the electrode core 200, which can also cancel the interference magnetic field generated by the electrode core 200.

[0095] In this embodiment, the end cap structure 300, formed by the first cover plate 310 and the second cover plate 320 to create the positive electrode connection portion 301 and the negative electrode connection portion 302, simplifies the design of the sealing structure. Only an insulating structure 330, providing insulation and sealing, needs to be placed between the positive electrode connection portion 301 and the negative electrode connection portion 302. The arc-shaped structure 10 is integrated into either the positive electrode connection portion 301 or the negative electrode connection portion 302, giving the end cap structure 300 the ability to counteract interfering magnetic fields and simplifying its structural composition. When this end cap structure 300 is applied to a battery, it has a defined angular relationship with the electrode core 200 after being mounted on the outer casing 100, simplifying battery assembly.

[0096] In this embodiment, the first cover plate 310 and the second cover plate 320 may have different positional relationships. After the first cover plate 310 is attached to the battery casing 100, please refer to... Figure 3 The second cover plate 320 can be located below the first cover plate 310, or it can be located above the first cover plate 310. The arc-shaped structure 10 can be formed on either the first cover plate 310 or the second cover plate 320. For ease of understanding, the following will be combined with... Figure 1 and Figure 3 The description primarily focuses on the example of the second cover plate 320 being located below the first cover plate 310, with details provided in the first and second type embodiments. Of course, to provide a comprehensive understanding of the design principles of this application, the third and fourth type embodiments are also described.

[0097] Please refer to the reference image. Figure 1 and 3 In the first embodiment, the first cover plate 310 is configured to be sealed and fitted onto the battery casing 100, the second cover plate 320 is located below the first cover plate 310, the second cover plate 320 forms a positive electrode connection portion 301 and passes through the first cover plate 310, the first cover plate 310 forms a negative electrode connection portion 302, and the negative electrode connection portion 302 includes an arcuate structure 10.

[0098] In this first embodiment, the second cover plate 320 is located below the first cover plate 310. During design, the positive electrode connection portion 301 formed by the second cover plate 320 needs to protrude from the end cap structure 300. Therefore, the first cover plate 310 has a first through hole 311, through which the portion of the second cover plate 320 used to form the positive electrode connection portion 301 can be exposed. To achieve a reliable connection between the positive electrode connection part 301 and the positive electrode adapter piece 400, the positive electrode connection part 301 can adopt a protruding structure. The protruding structure can be a solid structure and a columnar structure. Its back side can be a flat surface, which facilitates the connection of the positive electrode adapter piece 400 to the outside of the protruding structure. The back side of the protruding structure can be connected to the positive electrode tab 210 in a surface contact manner, ensuring the connection strength of each connection position. At the same time, due to the surface contact connection method, the connection area between the positive electrode tab 210 and the positive electrode connection part 301 can be increased, the current flow area can be increased, and high temperature can be prevented at the positive electrode connection part 301.

[0099] In other embodiments, the positive electrode connection portion 301 may also have other structural shapes, which are not limited in this application.

[0100] For the positive electrode connection portion 301, the insulating structure 330 needs to perform both sealing and insulation functions. Therefore, the insulating structure 330 can be designed as a layered structure sandwiched between the first cover plate 310 and the second cover plate 320. The insulating structure 330 at least fills the area around the first through hole 311, so that the positive electrode connection portion 301 is surrounded by the insulating structure 330. This achieves insulation between the first cover plate 310 and the second cover plate 320 at the positive electrode connection portion 301, while preventing liquid in the outer casing 100 from flowing out of the positive electrode connection portion 301.

[0101] It is understandable that the insulating structure 330 near the first through hole 311 can be a multi-layered structure to improve sealing and insulation effects, or it can be a multi-turn design to improve sealing and insulation effects. For a multi-turn design, it can be understood that the insulating structure 330 near the first through hole 311 can be a multi-ring structure; these ring structures can be an integral structure or a separate structure.

[0102] A negative electrode connection portion 302 is formed on a first cover plate 310, which has an arc-shaped slot 312 that surrounds a first through hole 311, forming the aforementioned arc-shaped structure 10 between the first through hole 311 and the arc-shaped slot 312. A negative electrode tab can be connected to this arc-shaped structure 10, allowing current to flow through the arc-shaped structure 10 and continuing to flow to the negative electrode adapter piece 500.

[0103] The aforementioned arc-shaped slot 312 can be arranged on the first cover plate 310 in different ways. It is understood that in order to form the arc-shaped structure 10, there must be at least one arc-shaped slot 312, and the area enclosed by the arc-shaped slot 312 can form the arc-shaped structure 10.

[0104] The above-described method of forming the arc-shaped structure 10 is based on the cooperation between the arc-shaped slot 312 and other structures, such as the cooperation between the arc-shaped slot 312 and the first through hole 311. In other embodiments, by reasonably designing the arc-shaped slot 312, the arc-shaped slot 312 itself can also form the arc-shaped structure 10.

[0105] Figure 10 An explosion diagram of yet another battery provided according to an embodiment of this application is shown; Figure 11 A cross-sectional view of yet another battery provided according to an embodiment of this application is shown; Figure 12 A schematic diagram of the structure of another battery provided according to an embodiment of this application is shown.

[0106] For example, in some embodiments, please refer to Figure 10 and Figure 11 Two arc-shaped slots 312 are formed on the first cover plate 310, and an arc-shaped structure 10 is formed between the two arc-shaped slots 312.

[0107] In the above embodiments, the formation of the arc-shaped structure 10 does not depend on other structures. The arc-shaped slot 312 itself can form the arc-shaped structure 10, which simplifies the formation of the arc-shaped structure 10.

[0108] For example, in some embodiments, please refer to Figure 12 An arc-shaped slot 312 is formed on the edge of the first cover plate 310. The arc-shaped slot 312 isolates the edge portion of the first cover plate 310 and forms an arc-shaped structure 10.

[0109] Here, arranging the arc-shaped structure 10 at the edge of the first cover plate 310 allows the local circuit formed by the arc-shaped structure 10 to be further away from the positive electrode connection portion 301 formed by the second cover plate 320, thereby achieving a better sealing and insulation effect.

[0110] For the negative electrode connection portion 302, the insulating structure 330 also needs to perform sealing and insulation functions. The insulating structure 330 can be designed as a layered structure sandwiched between the first cover plate 310 and the second cover plate 320. The insulating structure 330 needs to fill at least around the arc-shaped slot 312 so that the negative electrode connection portion 302 is surrounded by the insulating structure 330, thereby achieving insulation between the first cover plate 310 and the second cover plate 320 at the negative electrode connection portion 302, while the liquid in the outer casing 100 will not flow out from the negative electrode connection portion 302.

[0111] It is understandable that the insulating structure 330 near the arc-shaped slot 312 can be a multi-layered structure to improve sealing and insulation, or it can be a multi-turn design to improve sealing and insulation. For a multi-turn design, the insulating structure 330 near the arc-shaped slot 312 can be a multi-ringed structure; these rings can be an integral structure or separate structures. Furthermore, to achieve the connection between the negative electrode tab and the negative electrode connection part 302, a channel can be provided in the insulating structure 330, and then the negative electrode tab can be inserted into this channel and connected to the negative electrode connection part 302.

[0112] In the above description, the insulating structure 330 can be an integral structure, for example, it can be designed as an integral sheet structure, or the insulating structure 330 can be a split structure, for example, the corresponding components of the insulating structure 330 are respectively provided according to the aforementioned first through hole 311 and arc-shaped slot 312.

[0113] In the second embodiment, the first cover plate 310 is configured to be sealed and fitted onto the battery casing 100, the second cover plate 320 is located below the first cover plate 310, the second cover plate 320 forms a negative electrode connection portion 302 and passes through the first cover plate 310, and the first cover plate 310 forms a positive electrode connection portion 301, the positive electrode connection portion 301 including an arcuate structure 10.

[0114] Unlike the first type of embodiment described above, in this second type of embodiment, the positive electrode connection portion 301 is formed by the first cover plate 310, and the negative electrode connection portion 302 is formed by the second cover plate 320. This is equivalent to an interchange between the positive electrode connection portion 301 and the negative electrode connection portion 302 in the first type of embodiment. It is understood that, to accommodate this change, the layout of the positive electrode tab 210 and the negative electrode tab in the outer casing 100 also needs to be changed. For example, the negative electrode tab needs to be connected to the columnar negative electrode connection portion 302, and the positive electrode tab 210 needs to be connected to the arc-shaped positive electrode connection portion 301.

[0115] In this second type of embodiment, the insulation structure 330 can be designed with reference to the foregoing, and will not be described again.

[0116] In the third embodiment, the first cover plate 310 is configured to be sealed and fitted onto the battery casing 100, the second cover plate 320 is located above the first cover plate 310, the second cover plate 320 forms a positive electrode connection portion 301 and passes through the first cover plate 310, the first cover plate 310 forms a negative electrode connection portion 302, and the negative electrode connection portion 302 includes an arcuate structure 10.

[0117] Unlike the first type of embodiment described above, in this third type of embodiment, the second cover plate 320 is disposed above the first cover plate 310. Based on this, the protruding structure formed on the second cover plate 320 needs to protrude from top to bottom. The protruding structure can be configured to pass through the first through hole 311, extending beyond the plane of the first cover plate 310, thus facilitating connection with the positive electrode tab 210. The design of the insulating structure 330 in the first through hole 311 can refer to the first type of embodiment described above, and will not be repeated here. On the other hand, since the second cover plate 320 is located above the first cover plate 310, to expose the negative electrode connection portion 302 on the first cover plate 310, the structure of the insulating structure 330 corresponding to the arc-shaped slot 312 needs to be modified. For example, the second cover plate 320 and the insulating structure 330 can be designed to be fewer, making it difficult for them to completely cover the arc-shaped slot 312, thereby exposing the arc-shaped structure 10. To ensure insulation and sealing, the insulation structure 330 can be set on the back of the arc-shaped structure 10. The specific design method can be referred to the first type of embodiment mentioned above, and will not be repeated here.

[0118] In the fourth embodiment, the first cover plate 310 is configured to be sealed and fitted onto the battery casing 100, the second cover plate 320 is located above the first cover plate 310, the second cover plate 320 forms a negative electrode connection portion 302 and passes through the first cover plate 310, the first cover plate 310 forms the positive electrode connection portion 301, and the positive electrode connection portion 301 includes an arcuate structure 10.

[0119] Unlike the third type of embodiment described above, in this fourth type of embodiment, the positive electrode connection portion 301 is formed by the first cover plate 310, and the negative electrode connection portion 302 is formed by the second cover plate 320. This is equivalent to an interchange between the positive electrode connection portion 301 and the negative electrode connection portion 302 in the third type of embodiment. It is understood that, to accommodate this change, the layout of the positive electrode tab 210 and the negative electrode tab in the outer casing 100 also needs to be changed. For example, the negative electrode tab needs to be connected to the columnar negative electrode connection portion 302, and the positive electrode tab 210 needs to be connected to the arc-shaped positive electrode connection portion 301.

[0120] In this fourth type of embodiment, the insulation structure 330 can be designed with reference to the foregoing, and will not be described again.

[0121] In the aforementioned four embodiments, the arc-shaped structure 10 is formed on the first cover plate 310, which can serve as either the positive electrode connection portion 301 or the negative electrode connection portion 302. It is understood that, with a reasonable design of the insulation structure 330 and a reasonable arrangement of the positive electrode tab 210 and the negative electrode tab, the arc-shaped structure 10 can also be formed on the second cover plate 320. This is a simple replacement of the structure and a simple movement of the position, which is easy to implement and will not be elaborated further here.

[0122] In the foregoing embodiments, the insulating structure 330 can be integrally disposed between the first cover plate 310 and the second cover plate 320, which simplifies the insulating structure 330. It should be understood that in other embodiments, the insulating structure 330 can also adopt other structural forms to... Figure 3 As shown in the example, the insulating structure 330 can be designed as a covering structure that can cover the edge of the second cover plate 320, and can also achieve sealing and insulation performance.

[0123] In the embodiments of this application, the material of the insulating structure 330 can be selected according to the requirements, such as rubber, silicone, or other polymer materials.

[0124] In some embodiments, the core structure includes a first electrode and a second electrode, which can be either positive or negative electrodes. When the first electrode is positive, the second electrode is negative. The first and second electrodes are stacked and wound to form the core structure. The first electrode includes a portion extending beyond the second electrode along the winding direction. The extension direction of the arcuate structure is the same as or opposite to the extension direction of the core structure. This same or opposite setting can be set with reference to the aforementioned relationship between the core structure and the arcuate structure 10. In the axial direction of the core structure, the portion extending beyond the second electrode and the projection of the arcuate structure at least partially overlap.

[0125] Since the first electrode extends beyond the second electrode, it can fully cover the second electrode, thereby increasing the energy density of the battery. By setting the portion extending beyond the second electrode and the arc-shaped structure according to the projection relationship as described above, the magnetic field generated by the arc-shaped structure and the magnetic field generated by the extended portion are opposite to each other, thus canceling each other out and suppressing the generation of interfering magnetic fields.

[0126] In this embodiment of the application, in order to ensure the reliability of the connection and thus the sealing and insulation performance of the insulation structure 330, it is necessary to design the overlap length of the first cover plate 310, the second cover plate 320 and the insulation structure 330.

[0127] In some embodiments, please refer to Figure 3Corresponding to the first and second type embodiments described above, the second cover plate 320 is located below the first cover plate 310. The first cover plate 310 and the insulating structure 330 form a lead-out channel S. The positive electrode connection portion 301 extends from the lead-out channel S. The first cover plate 310, the second cover plate 320, and the insulating structure 330 form an overlapping section W around the lead-out channel S. The length L1 of the overlapping section W satisfies the following relationship:

[0128] L1 > 0.5 mm.

[0129] The lead-out channel S is formed by the aforementioned first through-hole 311 and a second through-hole 331 formed on the insulating structure 330, and the first through-hole 311 and the second through-hole 331 are connected to form the lead-out channel S. Figure 3 In the example shown, three overlapping sections W are formed. The length L1 of the three overlapping sections W is greater than 0.5 mm, which can ensure that each connection position of the end cap structure 300 has sufficient structural strength and can improve the sealing and insulation performance of the end cap structure 300.

[0130] Similarly, corresponding to the aforementioned third and fourth type embodiments, when the second cover plate 320 is located above the first cover plate 310, the first cover plate 310 and the insulating structure 330 form a lead-out channel W, the negative electrode connection portion 302 extends from the lead-out channel S, and the first cover plate 310, the second cover plate 320, and the insulating structure 330 form an overlapping section W around the lead-out channel S, the length L2 of the overlapping section W satisfying the following relationship:

[0131] L2 > 0.5 mm.

[0132] In some embodiments, please refer to Figure 1 The arc structure 10 includes an arc segment, the central angle of which is 90° to 270°.

[0133] Understandably, the central angle of the arc segment can be selected as needed, and setting it to 90° to 270° can balance the interfering magnetic field formed by the majority of the pole cores.

[0134] Figure 13 A schematic diagram of an arc-shaped structure provided according to an embodiment of this application is shown;

[0135] Figure 14 A schematic diagram of another arc-shaped structure provided according to an embodiment of this application is shown;

[0136] Figure 15 A schematic diagram of another arc-shaped structure provided according to an embodiment of this application is shown. Please refer to... Figure 13 The central angle corresponding to the arc segment is 90°; please refer to... Figure 14The central angle corresponding to the arc segment is 180°; please refer to... Figure 15 The central angle corresponding to the arc segment is 270°.

[0137] It should be noted that the design of the aforementioned central angle aims to change the length of the arc segment. This means that when the arc segment is long enough, at least one section can perfectly match the outer structure of the core 200, thus achieving precise balance of the interfering magnetic field. It is important to recognize that the length of the arc segment should not be too long to avoid generating a secondary interfering magnetic field.

[0138] Furthermore, as mentioned above, the arc-shaped slot 312 can be formed on the first cover plate 310 to create the arc-shaped structure 10. The distance between the arc-shaped slot 312 and the first through hole 311 determines the width of the arc-shaped structure 10. Therefore, based on a reasonable design of the central angle, the length of the arc-shaped slot 312 should be reasonably selected. For example, please refer to... Figure 1 and Figure 2 The distance between the arc-shaped slot 312 and the first through hole 311 can be reasonably configured to match the current density flowing through the arc-shaped structure 10.

[0139] In practical applications, a first cover plate 310 with a larger central angle can be selected, and then the arc segment and the pole core 200 can be matched by reasonably setting the aforementioned insulation structure 330.

[0140] In some embodiments, please refer to Figure 1 and Figure 3 The first cover plate 310 is also provided with an injection hole 313, which is located at the center of the first cover plate 310 or at the edge of the first cover plate 310.

[0141] When the injection hole 313 is located at the center of the first cover plate 310, please refer to... Figure 11 The end cap structure 300 forms a central liquid injection structure. When the liquid injection hole 313 is located at the edge of the first cover plate 310, please refer to... Figure 3 The end cap structure 300 forms an eccentric liquid injection structure. In this embodiment, the end cap structure 300 can switch the liquid injection mode of the battery by changing the position of the liquid injection hole 313. Based on the aforementioned structural form of the end cap structure 300, the position switching of the liquid injection hole 313 is easy and does not affect the inherent performance of the battery.

[0142] Based on the foregoing, it can be understood that in the embodiments associated with this application, the locations of the injection hole 313, the arc-shaped structure 10, and the positive electrode connection portion 301 are not limited, and the injection hole 313 can be located between the arc-shaped structure 10 and the positive electrode connection portion 301 (e.g., Figure 11As shown), the injection hole 313 can also be located at the edge of the arc-shaped structure 10 and the positive electrode connection 301 (as shown). Figure 3 (As shown).

[0143] It should be understood that the edge position refers to the outer edge of the first cover plate 310, and does not mean the outermost edge of the first cover plate 310.

[0144] In some specific embodiments, when the injection hole 313 is located at the edge of the first cover plate 310, the distance L3 between the center of the injection hole 313 and the edge of the adjacent injection hole 313 of the first cover plate 310 satisfies the following relationship:

[0145] L3 > 0.6 mm.

[0146] After the end cap structure 300 is installed onto the housing 100, L3 is the distance from the housing 100 to the center of the injection hole 313. Here, L3 > 0.6 mm ensures that the first cover plate 310 and the housing 100 have sufficient connection strength.

[0147] In some embodiments, the first cover plate 310 is made of a first material, the first material including at least stainless steel, and the end cap structure 300 further includes an injection hole cap 340 for closing the injection hole 313.

[0148] The injection hole cap 340 can be connected to the first cover plate 310 by laser welding. Based on the material properties of the first cover plate 310, the reliability of laser welding can be improved, and a tight connection between the injection hole cap 340 and the first cover plate 310 can be achieved.

[0149] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "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, and 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, and therefore should not be construed as a limitation of this application.

[0150] In the description of this application, it should be understood that the terms “comprising” and “having” as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0151] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "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 direct connection or an indirect connection through an intermediate medium; they can refer to the connection within two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances. Furthermore, the terms "first," "second," etc., 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.

[0152] 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 by, The battery comprises a shell, a pole core and a cover structure, the shell has a receiving cavity and an opening communicating with the receiving cavity, the pole core is arranged in the receiving cavity, and the cover structure seals the opening, The cover structure comprises: a first cover plate; a second cover plate, the second cover plate is arranged in layers with the first cover plate, one of the first cover plate and the second cover plate is formed with a positive electrode connecting part, and the other of the first cover plate and the second cover plate is formed with a negative electrode connecting part; and an insulation structure, the insulation structure is located between the positive electrode connecting part and the negative electrode connecting part and forms insulation, at least one of the positive electrode connecting part and the negative electrode connecting part comprises an arc-shaped structure, the arc-shaped structure is arranged concentrically with the pole core, the pole core comprises a first pole sheet and a second pole sheet, the first pole sheet and the second pole sheet are laminated and wound to form a winding core structure, the first pole sheet comprises an overhanging part which overhangs the second pole sheet in the winding direction; the extension direction of the arc-shaped structure is the same as or opposite to the extension direction of the winding core structure.

2. The battery of claim 1, wherein, the polarity of the arc-shaped structure is the same as or opposite to the polarity of the first pole sheet. the polarity of the arc-shaped structure is the same as or opposite to the polarity of the first pole sheet.

3. The battery of claim 1, wherein, The first cover plate is sealed and assembled to the shell, the second cover plate is located on the lower side or the upper side of the first cover plate, and the arc-shaped structure is formed on the first cover plate or the second cover plate.

4. The battery of claim 2, wherein, The insulation structure is arranged between the first cover plate and the second cover plate.

5. The battery of any one of claims 1 to 3, wherein, The first cover plate and the insulation structure are formed with a lead-out channel, the positive electrode connecting part extends from the lead-out channel, and the first cover plate, the second cover plate and the insulation structure are formed with an overlapping section adjacent to the lead-out channel, the length L1 of the overlapping section satisfies the relationship: L1>0.5mm.

6. The battery of any one of claims 1 to 3, wherein, The arc-shaped structure comprises a circular arc section, and the central angle of the circular arc section is 90°-270°.

7. The battery of any one of claims 1 to 3, wherein, At least one arc-shaped slot hole is formed on the first cover plate, and the area surrounded by the arc-shaped slot hole forms the arc-shaped structure.

8. The battery of claim 7, wherein, One arc-shaped slot hole is formed on the first cover plate, the first cover plate has a first through hole, the arc-shaped slot hole is arranged around the first through hole, and the arc-shaped slot hole and the first through hole form the arc-shaped structure.

9. The battery of claim 7, wherein, Two arc-shaped slot holes are formed on the first cover plate, and the arc-shaped structure is formed between the two arc-shaped slot holes.

10. The battery of claim 7, wherein, The arc-shaped slot hole is formed on the edge of the first cover plate, and the arc-shaped slot hole isolates the edge part of the first cover plate and forms the arc-shaped structure.

11. The battery of any one of claims 1-3, wherein, The first cover plate is also provided with a liquid injection hole, and the liquid injection hole is located at the center of the first cover plate or at the edge of the first cover plate.

12. The battery of claim 11, wherein, The liquid injection hole is located at the edge of the first cover plate, the distance L3 between the center of the liquid injection hole and the edge of the first cover plate adjacent to the liquid injection hole satisfies the relationship: L3>0.6mm.

13. The battery of any one of claims 1-3, wherein, The first cover plate is made of a first material, and the first material comprises stainless steel.

14. The battery of any one of claims 1-3, wherein, The battery further comprises: a positive electrode adapter plate connected to the positive electrode connecting part; and a negative tab connected to the negative connecting portion, at least one of the positive tab and the negative tab protruding from the case and forming a positioning structure.

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