Battery

Abstract

The invention 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] The present application relates to the field of battery technology, and in particular to a battery. Background Art

[0002] The cylindrical batteries currently used in wireless headphones will generate an interference magnetic field on the pole core that interferes with the headphone speakers when powered on, thus affecting the use of the wireless headphones. To solve this problem, it is necessary to set an auxiliary structure on the cylindrical battery. When the current passes through the auxiliary structure, an auxiliary magnetic field will be generated to offset the interference magnetic field, thereby eliminating the impact of the interference magnetic field on the headphone speakers. However, the setting of the above-mentioned auxiliary structure will not only make the structure of the cylindrical battery complicated, but these auxiliary structures need to be arranged at a set angle with the pole core, otherwise it will be difficult to offset the interference magnetic field, and it may even easily cause a secondary interference magnetic field. This arrangement requirement also increases the difficulty of assembling cylindrical batteries. Summary of the invention

[0003] The present application provides a battery that can effectively simplify the structural composition of the battery and reduce the difficulty of assembling the battery on the basis of eliminating interfering magnetic fields.

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

[0005] The invention comprises a shell, a pole core and an end cover structure, wherein 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 end cover structure seals the opening.

[0006] The end cap structure comprises:

[0007] first cover plate;

[0008] a second cover plate, the second cover plate being stacked with the first cover plate, one of the first cover plate and the second cover plate being formed with a positive electrode connection portion, and the other of the first cover plate and the second cover plate being formed with a negative electrode connection portion;

[0009] and an insulating structure, the insulating structure being located between the positive electrode connecting portion and the negative electrode connecting portion and forming insulation, at least one of the positive electrode connecting portion and the negative electrode connecting portion comprising an arc structure, the arc structure being arranged concentrically with the pole core,

[0010] The pole core comprises a first pole piece and a second pole piece, the first pole piece and the second pole piece are stacked and wound to form a winding core structure, and the first pole piece comprises a protruding portion that protrudes beyond the second pole piece along a winding direction;

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

[0012] In the battery of the embodiment of the present application, the difficulty of setting the sealing structure can be simplified by forming the positive electrode connection part and the negative electrode connection part by the first cover plate and the second cover plate. It is only necessary to set an insulating structure that can play an insulating and sealing role between the positive electrode connection part and the negative electrode connection part. The arc structure is integrated and designed on the positive electrode connection part or the negative electrode connection part, so that the end cover structure itself has the performance of offsetting the interference magnetic field, which can simplify the structural composition of the end cover structure. When the end cover structure is applied to the battery, the end cover structure has a certain angle relationship with the pole core after being installed on the shell, which can simplify the assembly of the battery. In addition, since the first pole piece exceeds the second pole piece, since the first pole piece exceeds the second pole piece, the first pole piece can fully cover the second pole piece, thereby improving the energy density of the battery. The part exceeding the second pole piece and the arc structure are arranged as above according to the projection relationship. On the basis of improving the energy density of the battery, the magnetic field generated by the arc structure and the magnetic field generated by the exceeding part are opposite, thereby offsetting each other and simulating the generation of the interference magnetic field.

[0013] In a possible implementation, the polarity of the arc structure is the same as the polarity of the first pole piece, or

[0014] The polarity of the arc structure is the same as the polarity of the first pole piece.

[0015] In a possible implementation, the first cover plate is sealingly assembled to the housing, the second cover plate is located on the lower side or the upper side of the first cover plate, and the arc structure is formed on the first cover plate or the second cover plate.

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

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

[0018] L1>0.5mm.

[0019] In a possible implementation, the arc structure includes an arc segment, and the center angle corresponding to the arc segment is 90° to 270°.

[0020] In a possible implementation, at least one arc-shaped slot is formed on the first cover plate, and the area surrounded by the arc-shaped slot forms the arc-shaped structure.

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

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

[0023] In a possible implementation, the arc-shaped slot is formed at an edge of the first cover plate, and the arc-shaped slot isolates an edge portion of the first cover plate and forms the arc-shaped structure.

[0024] In a possible implementation, a liquid injection hole is further provided on the first cover plate, and the liquid injection hole is located at a central position of the first cover plate or the liquid injection hole is located at an edge position of the first cover plate.

[0025] In a 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 relationship:

[0026] L3>0.6mm.

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

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

[0029] A positive electrode adapter, connected to the positive electrode connecting portion;

[0030] and a negative electrode adapter plate connected to the negative electrode connecting portion, wherein at least one of the positive electrode adapter plate and the negative electrode adapter plate extends out of the housing to form a positioning structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art description are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

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

[0033] Figure 2A schematic diagram of an explosion of a battery provided according to an embodiment of the present application is shown;

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

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

[0036] Figure 5 A schematic diagram of an explosion of another battery provided according to an embodiment of the present application is shown;

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

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

[0039] Figure 8 A schematic diagram showing the winding direction of a pole core and the extending direction of an arc structure provided in an embodiment of the present application is shown;

[0040] Fig. 9 A schematic diagram showing the winding direction of another pole core and the extending direction of the arc structure provided according to an embodiment of the present application is shown;

[0041] Fig.10 A schematic diagram of an explosion of another battery provided according to an embodiment of the present application is shown;

[0042] Fig.11 A cross-sectional view of another battery provided according to an embodiment of the present application is shown;

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

[0044] Fig.13 A schematic structural diagram of an arc structure provided according to an embodiment of the present application is shown;

[0045] Fig.14 A schematic structural diagram of another arc-shaped structure provided according to an embodiment of the present application is shown;

[0046] Fig.15 A structural schematic diagram of another arc-shaped structure provided according to an embodiment of the present application is shown.

[0047] Reference numerals:

[0048] 100-housing; 101-accommodation chamber;

[0049] 200-electrode core; 210-positive electrode ear; 220-positive electrode sheet; 230-negative electrode sheet;

[0050] 300-end cover structure; 301-positive electrode connection part; 302-negative electrode connection part; 310-first cover plate; 320-second cover plate; 330-insulating structure; 340-liquid injection hole cover; 311-first through hole; 312-arc slot hole; 313-liquid injection hole; 331-second through hole;

[0051] 400-positive electrode adapter; 410-positive electrode connecting section; 420-positive electrode extension section; 430-positive electrode conductive end;

[0052] 500-negative electrode adapter; 510-negative electrode connecting section; 520-negative electrode extension section; 530-negative electrode conductive end;

[0053] 600- positioning structure;

[0054] 700-insulation isolation layer; 10-arc structure. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] The cylindrical battery used in electronic devices such as wireless headphones needs to be connected to the circuit in the wireless headphones by setting an adapter. The adapter includes a positive adapter and a negative adapter. The positive adapter is connected to the positive electrode of the cylindrical battery, the negative adapter is connected to the negative electrode of the cylindrical battery, and the positive adapter and the negative adapter are respectively connected to the positive current terminal and the negative current terminal in the inactive headphones, so as to achieve the conduction of the circuit.

[0057] In the operation of the above cylindrical battery, based on the specific shape of the cylindrical battery, after the cylindrical battery is powered on, the pole core in the cylindrical battery will generate an interference magnetic field that interferes with the headphone speaker. The interference magnetic field will affect the sound quality of the headphone speaker, thereby affecting the use effect of the wireless headset. Based on this, the above interference magnetic field can be offset by setting an auxiliary structure. The auxiliary structure can be set separately or directly integrated into the positive electrode adapter or the negative electrode adapter. These auxiliary structures are usually designed to have the same winding direction as the pole core, so that after the current flows through the auxiliary structure, an auxiliary magnetic field that can offset the interference magnetic field can be formed, thereby eliminating the influence of the interference magnetic field on the headphone speaker.

[0058] The setting of the above-mentioned auxiliary structures, whether they are set as independent structures or integrated into the positive electrode adapter plate or the negative electrode adapter plate, will cause the structure of the cylindrical battery to be complicated, and these auxiliary structures need to maintain a stable angle relationship with the pole core, which will increase the difficulty of assembling the cylindrical battery.

[0059] Based on the above-mentioned status quo and problems, an embodiment of the present application provides a battery, which may be a cylindrical battery. Through reasonable structural design and matching of different structures of the battery itself, the battery itself can generate an auxiliary magnetic field to offset the interfering magnetic field. There is no need to set up the auxiliary structure in the related technology, which can simplify the structural composition of the battery and reduce the difficulty of assembling the battery.

[0060] The core of the design of the battery in the embodiment of the present application is to optimize the design of its own structure, for example, the structure of a certain inherent component of the battery can be optimized and this part of the structure can generate an auxiliary magnetic field to offset the interfering magnetic field.

[0061] It is understandable that, for the inherent structure of the battery, there is an assembly relationship between the battery shell and the end cap structure of the battery. When assembling the battery, the end cap structure needs to be installed on the shell. The pole core needs to be accommodated inside the shell, and the shell needs to protect and isolate the current of the pole core. The shell also serves as a force-bearing part for transportation. For example, when transporting or moving the battery by grasping, manipulators, etc., the applied force generally acts directly on the shell. Therefore, the shell is generally designed to be a closed structure except for necessary openings. For the end cap structure, it needs to play the role of closing the above-mentioned openings, and the end cap structure also needs to form an electrical connection with the pole core. Therefore, when designing the structure of the battery, it is generally focused on the end cap structure. Based on the above considerations, the embodiment of the present application focuses the design points on the end cap structure, so that the end cap structure can generate the above-mentioned auxiliary magnetic field. After the end cap structure is installed on the shell, a certain angle relationship can be formed between the end cap structure and the pole core, and the auxiliary magnetic field can offset the interfering magnetic field, with stable performance and simple assembly.

[0062] Figure 1 A schematic diagram of the structure of a battery provided according to an embodiment of the present application is shown; Figure 2 A schematic diagram of an explosion of a battery provided according to an embodiment of the present application is shown; Figure 3 A cross-sectional view of a battery provided according to an embodiment of the present application is shown. In the embodiment of the present application, please refer to Figures 1 to 3 The battery includes a shell 100, a pole core 200 and an end cover structure 300.

[0063] The shell 100 is a protective shell of the battery. To ensure its strength and structural stability, the shell 100 can be made of aluminum or aluminum alloy. The shell 100 can be manufactured by stamping or integral injection molding. The shell 100 has a receiving cavity 101 and an opening connected to the receiving cavity 101. The shell 100 can be configured as a cylindrical structure, specifically, a cylindrical structure with one end open. In other embodiments, the shell 100 can also be configured as other structures.

[0064] The pole core 200 is disposed in the receiving cavity 101. The pole core 200 may adopt a winding structure. The pole core 200 is formed by winding the positive electrode sheet, the separator and the negative electrode sheet and is cylindrical. It is understandable that when the winding direction is different, the pole core 200 has different hierarchical structures. For example, in some cases, when the winding direction is clockwise, the outermost layer of the pole core 200 may be the positive electrode sheet 220 (see Fig. 9 ), when the winding direction is counterclockwise, the outermost layer of the pole core 200 may be the negative electrode sheet 230 (refer to 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, so that the magnetic fields generated by the pole core 200 cannot offset each other, thereby causing electromagnetic interference; to offset this difference, some parts of the end cover structure 300 need to be adaptively designed.

[0065] In order to realize the electrical connection between the pole core 200 and the end cap structure 300, the pole core 200 is further provided with a positive pole ear 210 and a negative pole ear, which can be arranged at both ends of the pole core 200, the positive pole ear 210 is connected to the positive electrode sheet 220, and the negative pole ear is connected to the negative electrode sheet 230. Correspondingly, in order to realize the connection between the end cap structure 300 and the pole core 200, the end cap structure 300 is provided with a positive electrode connecting portion 301 and a negative electrode connecting portion 302, the positive electrode connecting portion 301 is connected to the positive pole ear 210, and the negative pole connecting portion 302 is connected to the negative pole ear.

[0066] In the above description, it should be noted that, in some cases, the end cap structure 300 can be used as the positive electrode of the battery and connected to the positive electrode ear 210, the bottom of the shell 100 can be used as the negative electrode of the battery and connected to the negative electrode ear, the positive electrode connection part 301 can be used as the positive electrode of the battery, the positive electrode adapter 400 can be connected to the positive electrode connection part 301, and the negative electrode adapter 500 is connected to the negative electrode. In the above case, the negative electrode ear needs to be connected to the bottom of the shell 100 and the negative electrode connection part 302 in the end cap structure 300 at the same time. At this time, for the negative electrode connection part 302, the negative electrode connection part 302 can form an independent current path. Based on the current path, the structure of the negative electrode connection part 302 can be optimized and designed so that it can form the above-mentioned auxiliary magnetic field. In the above case, it is equivalent to opening up an independent current path in the normal connection relationship of the battery. The role of this current path is to offset the interference magnetic field generated by the pole core.

[0067] In other cases, the end cap structure 300 can also serve as both the positive and negative electrodes of the battery. In this case, the positive electrode connection portion 301 is connected to the positive electrode ear 210, and the negative electrode connection portion 302 is connected to the negative electrode ear. The positive electrode connection portion 301 can serve as the positive electrode of the battery, and the negative electrode connection portion 302 can serve as the negative electrode of the battery. The positive electrode ear 210 and the negative electrode ear can be connected to the end cap structure 300 through structural optimization. In the above case, one of the positive electrode connection portion 301 and the negative electrode connection portion 302 can be optimized to form an auxiliary magnetic field in a part of its current path that can offset the interfering magnetic field. In the above case, it is equivalent to localizing the original current path so that the local current path has the effect of offsetting the interfering magnetic field.

[0068] In the embodiment of the present application, the end cap structure 300 is mainly optimized to form the auxiliary magnetic field. It can be understood that the positive and negative poles of the battery as a whole are not limited, and the positive and negative poles can be located at both ends of the battery. Of course, based on the structural optimization of the end cap structure 300 in the present application, the positive and negative poles can also be integrated on the end cap structure 300 at the same time.

[0069] The battery in the embodiment of the present application is based on the optimized design of the end cover structure 300, so that the battery itself can offset the interfering magnetic field and is also easy to assemble.

[0070] In the following embodiments, the second case mentioned above will be mainly used as an example for description, that is, the positive and negative electrodes of the battery are located at one end of the battery (of course, the positive and negative electrodes can also be located at both ends of the battery). At this time, both the positive ear 210 and the negative ear need to be connected to the end cover structure 300, and an optimized design can be made for one of the positive connection part 301 and the negative connection part 302. The advantage of using the second case to design the battery is that when the battery in the embodiment of the present application is used in electronic devices such as wireless headphones, it is convenient to set the positive adapter 400 and the negative adapter 500 at the same end of the battery so that the battery can be installed in electronic devices such as wireless headphones.

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

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

[0073] In the embodiment of the present application, the positive electrode adapter 400 and the negative electrode adapter 500 are used as the current extraction structure of the battery, and are intended to establish an electrical connection with the electronic device. The shape of the positive electrode adapter 400 and the negative electrode adapter 500 is not limited. For example, they can be designed as a linear structure or a simple bending structure, which is easy to manufacture and shape. The positioning structure 600 formed on the positive electrode adapter 400 or the negative electrode adapter 500 can position the installation of the battery, so that the battery can be easily installed in the electronic device.

[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 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, according to the following description of the end cover structure 300, the negative electrode connection part 302 can be an arc-shaped structure 10. Correspondingly, the negative electrode connection section 510 can be designed to be an arc. The negative electrode extension section 520 extends outward from both ends of the negative electrode connection section 510. One of the two ends can be used as a negative electrode conductive terminal 530 to connect to the negative current terminal in the electronic device, and the other can extend out of the housing 100 to form a positioning structure 600, or it can not extend out of the housing 100.

[0075] In some embodiments, please refer to Figure 4 and Figure 5 The positive electrode connecting piece 400 includes a positive electrode connecting segment 410 and a positive electrode extending segment 420. The positive electrode connecting segment 410 is used to connect the positive electrode connecting part 301. It needs to be designed according to the specific structure of the positive electrode connecting part 301. For example, according to the description of the end cap structure 300 below, the positive electrode connecting part 301 can be a columnar structure. Correspondingly, the positive electrode connecting segment 410 can be designed as a circular structure. The positive electrode extending segment 420 extends outward from both ends of the positive electrode connecting segment 410. One of the two ends can be used as a positive electrode conductive end 430 to connect with the positive 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 not extend out of the housing 100.

[0076] It is understood that in order to facilitate the installation of the battery into the electronic device to form a connection with the electronic device, please refer to Figure 6 , the negative electrode extension segment 520 and the positive electrode extension segment 420 may extend in the same direction to form the negative electrode conductive end 530 and the 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, which needs to be determined according to the specific positions of the positive electrode connection part 301 and the negative electrode connection part 302. For example, in the above description, the negative electrode connection part 302 and the positive electrode connection part 301 can be interchanged, that is, the arc-shaped structure 10 can be the negative electrode connection part 302, and the columnar structure can be the positive electrode connection part 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 understandable that the present 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 positive electrode adapter 400 or the negative electrode adapter 500 extends out of the battery housing 100 to form the positioning structure 600. For another example, 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 housing 100 to a certain extent. In addition, the positive electrode adapter 400 and the negative electrode adapter 500 can form positioning structures 600 respectively, and the two positioning structures 600 can face the same side or different sides, so that the battery is easier to be installed in an electronic device.

[0079] Figure 6 A top view of a battery provided according to an embodiment of the present application is shown; Figure 7 FIG. 2 shows a top view of another battery provided according to an embodiment of the present application. Figure 6 , the positive electrode adapter 400 and the negative electrode adapter 500 both adopt a simple bending structure, wherein the negative electrode adapter 500 extends out of the housing 100 to form a positioning structure 600, which is a continuation of the negative electrode adapter 500; please refer to Figure 7 The positive electrode adapter sheet 400 and the negative electrode adapter sheet 500 both adopt a simple bending structure, wherein the positive electrode adapter sheet 400 extends out of the housing 100 to form a positioning structure 600 , and the positioning structure 600 is a continuation of the positive electrode adapter sheet 400 .

[0080] It can be understood that in the aforementioned embodiment in which the positive electrode adapter plate 400 and the negative electrode adapter plate 500 are arranged at the same end of the battery, short circuit needs to be prevented and insulation needs to be formed between the positive electrode adapter plate 400 and the negative electrode adapter plate 500. The insulation between the positive electrode adapter plate 400 and the negative electrode adapter plate 500 can be achieved through a first insulating structure.

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

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

[0083] In some other embodiments, the battery also includes an insulating filling layer, which is one of the above-mentioned first insulating structures. The insulating filling layer can be filled in the space between the positive electrode adapter plate 400 and the negative electrode adapter plate 500 to achieve the purpose of isolating the positive electrode adapter plate 400 and the negative electrode adapter plate 500.

[0084] In some specific embodiments, the insulating isolation layer 700 may be made of insulating tape, which is relatively thin 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 plate 400 and the negative electrode adapter plate 500 can be located at different heights. For example, the positive electrode connection portion 301 and the negative electrode connection portion 302 can be designed to be at different heights, so that after the positive electrode adapter plate 400 and the negative electrode adapter plate 500 are installed at corresponding positions, the positive electrode adapter plate 400 and the negative electrode adapter plate 500 have different heights.

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

[0087] In the examples of this application, please refer to Figure 1 and Figure 3 The end cover 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 , and a positive electrode connecting portion 301 is formed on one of the first cover plate 310 and the second cover plate 320 , and a negative electrode connecting portion 302 is formed on the other of the first cover plate 310 and the second cover plate 320 .

[0089] The first cover plate 310 and the second cover plate 320 can be designed to have the same size, that is, the first cover plate 310 and the second cover plate 320 have the same area. To simplify the structure, one of the first cover plate 310 and the second cover plate 320 can be set to have a larger area so that it can be sealed and covered on the battery housing 100. In the embodiment of the present application, the area of ​​the first cover plate 310 is larger than the area of ​​the second cover plate 320. When the end cover structure 300 is installed on the housing 100, the edge of the first cover plate 310 can be connected to the housing 100.

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

[0091] The first cover plate 310 and the second cover plate 320 are stacked together. To ensure sealing and prevent leakage of liquid (such as electrolyte), the insulating structure 330 needs to have sealing performance; one of the first cover plate 310 and the second cover plate 320 is formed with a positive electrode connection part 301, and the other of the first cover plate 310 and the second cover plate 320 is formed with a negative electrode connection part 302. To prevent short circuit, the insulating structure 330 needs to have insulating performance.

[0092] Combined with the foregoing, 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 interfering 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 interfering magnetic field.

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

[0094] Figure 8 A schematic diagram showing the winding direction of a pole core and the extending direction of an arc structure provided in an embodiment of the present application is shown; Fig. 9 Schematic diagram showing the winding direction of another pole core and the extending direction of the arc structure according to an embodiment of the present application. Figure 8, the pole core 200 is wound in a first direction, the outer structure of the pole core 200 is a negative electrode sheet 230, and the arc structure 10 extends from the outside to the inside along the A direction (clockwise direction). When the arc structure 10 is used 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 pole core 200, which can offset the interference magnetic field generated by the pole core 200. When the arc structure 10 is used 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 pole core 200, which can also offset the interference magnetic field generated by the pole core 200. Please refer to Fig. 9 The pole core 200 is wound in the second direction, the outer structure of the pole core 200 is the positive electrode sheet 220, and the arc structure 10 extends from the right outside to the inside along the B direction (counterclockwise direction). When the arc structure 10 is used 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 pole core 200, which can offset the interference magnetic field generated by the pole core 200. When the arc structure 10 is used as the negative electrode connection part 302, the current flowing through the negative electrode connection part 302 is the same as the winding direction of the pole core 200, which can also offset the interference magnetic field generated by the pole core 200.

[0095] The end cap structure 300 in the embodiment of the present application can simplify the difficulty of setting the sealing structure by forming the positive electrode connection part 301 and the negative electrode connection part 302 through the first cover plate 310 and the second cover plate 320. It is only necessary to set an insulating structure 330 that can play an insulating and sealing role between the positive electrode connection part 301 and the negative electrode connection part 302. The arc structure 10 is integratedly designed on the positive electrode connection part 301 or the negative electrode connection part 302, so that the end cap structure 300 itself has the performance of offsetting the interfering magnetic field, which can simplify the structural composition of the end cap structure 300. When the end cap structure 300 is applied to the battery, the end cap structure 300 has a certain angle relationship with the pole core 200 after being installed on the shell 100, which can simplify the assembly of the battery.

[0096] In the embodiment of the present application, the first cover plate 310 and the second cover plate 320 may have different positional relationships. After the first cover plate 310 is connected to the battery housing 100, please refer to Figure 3 The second cover plate 320 may be located at the lower side of the first cover plate 310, or the second cover plate 320 may be located at the upper side of the first cover plate 310, and the arc structure 10 may be formed on the first cover plate 310 or the second cover plate 320. Figure 1 and Figure 3 The second cover plate 320 is located at the lower side of the first cover plate 310. For details, see the first embodiment and the second embodiment. Of course, in order to fully understand the design points of this application, the third embodiment and the fourth embodiment are also introduced.

[0097] Please refer to the reference picture Figure 1 and 3 In the first type of embodiment, the first cover plate 310 is configured to be able to be sealed and assembled on the battery housing 100, the second cover plate 320 is located on the lower side of the first cover plate 310, the second cover plate 320 forms the positive electrode connection portion 301 and passes through the first cover plate 310, the first cover plate 310 forms the negative electrode connection portion 302, and the negative electrode connection portion 302 includes an arc structure 10.

[0098] In the first embodiment, the second cover plate 320 is located at the lower side of the first cover plate 310. During design, the positive electrode connection portion 301 formed by the second cover plate 320 needs to be exposed from the end cover structure 300. To this end, the first cover plate 310 is formed with a first through hole 311, and the portion of the second cover plate 320 for forming the positive electrode connection portion 301 can be exposed from the first through hole 311. In order to achieve reliable connection between the positive electrode connection part 301 and the positive electrode adapter plate 400, the positive electrode connection part 301 can adopt a raised structure. The raised structure can be a solid structure and a columnar structure, and its back side can be a flat surface, so that the outer side of the raised structure can be connected to the positive electrode adapter plate 400, and the back side of the raised structure can be connected to the positive electrode ear 210 in a surface contact manner to ensure the connection strength of each connection position. At the same time, due to the use of a surface contact connection method, the connection area between the positive electrode ear 210 and the positive electrode connection part 301 can be increased, the current flow area is increased, and high temperature can be prevented from being generated at the positive electrode connection part 301.

[0099] In other embodiments, the positive electrode connecting portion 301 may also have other structural shapes, which is not limited in the present application.

[0100] For the positive electrode connection part 301, the insulating structure 330 needs to perform sealing and insulating functions, so the insulating structure 330 can be designed as a layered structure sandwiched between the first cover plate 310 and the second cover plate 320, and the insulating structure 330 is at least filled around the above-mentioned first through hole 311, so that the positive electrode connection part 301 is surrounded by the insulating structure 330, thereby realizing the insulation of the first cover plate 310 and the second cover plate 320 at the positive electrode connection part 301, and at the same time, the liquid in the outer shell 100 will not flow out from the positive electrode connection part 301.

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

[0102] The negative electrode connection portion 302 is formed on the first cover plate 310, and the first cover plate 310 is provided with an arc-shaped slot 312, which is arranged around the first through hole 311, so that the aforementioned arc-shaped structure 10 is formed between the first through hole 311 and the arc-shaped slot 312. The negative electrode ear can be connected to the arc-shaped structure 10, so that there is current in the arc-shaped structure 10 and the current can continue to flow to the negative electrode adapter 500.

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

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

[0105] Fig.10 A schematic diagram of an explosion of another battery provided according to an embodiment of the present application is shown; Fig.11 A cross-sectional view of another battery provided according to an embodiment of the present application is shown; Fig.12 A schematic structural diagram of another battery provided according to an embodiment of the present application is shown.

[0106] For example, in some embodiments, see Fig.10 and Fig.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 embodiment, the formation of the arc-shaped structure 10 does not rely on other structures, and the arc-shaped slot 312 itself can form the arc-shaped structure 10 , which can simplify the formation method of the arc-shaped structure 10 .

[0108] For example, in some embodiments, please refer to Fig.12 An arc-shaped slot 312 is formed at the edge of the first cover plate 310 , and 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 structure 10 at the edge of the first cover plate 310 can make the local loop formed by the arc structure 10 farther away from the positive electrode connecting portion 301 formed by the second cover plate 320 , thereby achieving better sealing and insulation effects.

[0110] For the negative electrode connection part 302, the insulating structure 330 also needs to perform sealing and insulating 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 at least fill the surrounding of the arc-shaped slot 312, so that the surrounding of the negative electrode connection part 302 is surrounded by the insulating structure 330, thereby achieving insulation of the first cover plate 310 and the second cover plate 320 at the negative electrode connection part 302, and at the same time, the liquid in the outer shell 100 will not flow out from the negative electrode connection part 302.

[0111] It is understandable that the insulating structure 330 disposed near the arc-shaped slot 312 may be a multi-layer structure to improve the sealing and insulation effects, or may be a multi-turn design to improve the sealing and insulation effects. For the multi-turn design, it can be understood that the insulating structure 330 may be a multi-turn ring structure near the arc-shaped slot 312, and these ring structures may be an integral structure or a split structure. In addition, in order to achieve the connection between the negative electrode ear and the negative electrode connecting portion 302, a channel may be provided in the insulating structure 330, and then the negative electrode ear is inserted into the channel and connected to the negative electrode connecting portion 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, and the insulating structure 330 can also be a split structure, for example, the corresponding components of the insulating structure 330 are respectively arranged according to the aforementioned first through hole 311 and the arc-shaped slot 312.

[0113] In the second type of embodiment, the first cover plate 310 is configured to be able to be sealed and assembled on the battery housing 100, the second cover plate 320 is located on the lower side of the first cover plate 310, the second cover plate 320 forms the 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 arc structure 10.

[0114] Different from the aforementioned first embodiment, in the second embodiment, the positive electrode connection part 301 is formed by the first cover plate 310, and the negative electrode connection part 302 is formed by the second cover plate 320, which is equivalent to the positive electrode connection part 301 and the negative electrode connection part 302 in the first embodiment being interchanged. It can be understood that in order to adapt to this change, the layout of the positive electrode ear 210 and the negative electrode ear in the housing 100 also needs to be changed, for example, the negative electrode ear needs to be connected to the negative electrode connection part 302 in a columnar structure, and the positive electrode ear 210 needs to be connected to the positive electrode connection part 301 in an arc-shaped structure 10.

[0115] In the second type of embodiments, the insulating structure 330 may be designed with reference to the above, and will not be described in detail.

[0116] In the third type of embodiment, the first cover plate 310 is configured to be able to be sealed and assembled on the battery housing 100, the second cover plate 320 is located on the upper side of the first cover plate 310, the second cover plate 320 forms the positive electrode connection portion 301 and passes through the first cover plate 310, the first cover plate 310 forms the negative electrode connection portion 302, and the negative electrode connection portion 302 includes an arc structure 10.

[0117] Different from the aforementioned first embodiment, in the third embodiment, the second cover plate 320 is arranged on the upper side of the first cover plate 310. Based on this, the raised structure formed on the second cover plate 320 needs to be raised from top to bottom, and the raised structure can be arranged to pass through the first through hole 311, so that the raised structure exceeds the plane where the first cover plate 310 is located, so that the raised structure is easy to connect with the positive ear 210. The design method of the insulating structure 330 in the first through hole 311 can refer to the aforementioned first embodiment, and will not be repeated. On the other hand, since the second cover plate 320 is located on the upper side of the first cover plate 310, in order to expose the negative electrode connection part 302 on the first cover plate 310, the insulating structure 330 needs to be changed in the structure corresponding to the arc slot 312. For example, the second cover plate 320 and the insulating structure 330 can be designed to be less, so that it is difficult for them to fully cover the arc slot 312, thereby exposing the arc structure 10. To ensure insulation and sealing, the insulation structure 330 may be disposed on the back of the arc structure 10 . The specific design method thereof may refer to the first embodiment described above and will not be described in detail.

[0118] In the fourth type of embodiments, the first cover plate 310 is configured to be able to be sealed and assembled on the battery housing 100, the second cover plate 320 is located on the upper side of the first cover plate 310, the second cover plate 320 forms the 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 arc structure 10.

[0119] Different from the aforementioned third embodiment, in the fourth embodiment, the positive electrode connection part 301 is formed by the first cover plate 310, and the negative electrode connection part 302 is formed by the second cover plate 320, which is equivalent to the positive electrode connection part 301 and the negative electrode connection part 302 in the third embodiment being interchanged. It can be understood that in order to adapt to this change, the layout of the positive electrode ear 210 and the negative electrode ear in the housing 100 also needs to be changed, for example, the negative electrode ear needs to be connected to the negative electrode connection part 302 in a columnar structure, and the positive electrode ear 210 needs to be connected to the positive electrode connection part 301 in an arc-shaped structure 10.

[0120] In the fourth type of embodiments, the insulating structure 330 may be designed with reference to the above, and will not be described in detail.

[0121] In the above four types of embodiments, the arc structure 10 is formed on the first cover plate 310, which can be used as the positive electrode connection portion 301 or the negative electrode connection portion 302. It is understandable that, under the condition of reasonable design of the insulating structure 330 and reasonable arrangement of the positive electrode ear 210 and the negative electrode ear, the arc 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 described in detail herein.

[0122] In the above-mentioned embodiment, the insulating structure 330 can be disposed as a whole between the first cover plate 310 and the second cover plate 320, which can simplify the insulating structure 330. It should be appreciated that in other embodiments, the insulating structure 330 can also adopt other structural forms. Figure 3 As shown in the example, the insulating structure 330 can be designed as a covering structure capable of covering the edge of the second cover plate 320, and can also achieve sealing and insulating properties.

[0123] In the embodiment of the present application, the material of the insulating structure 330 can be selected according to needs, for example, it can be rubber, silicone, or some other polymer materials.

[0124] In some embodiments, the winding core structure includes a first pole piece and a second pole piece, wherein the first pole piece and the second pole piece can be a positive pole piece or a negative pole piece. When the first pole piece is a positive pole piece, the second pole piece is a negative pole piece. The first pole piece and the second pole piece are stacked and wound to form a winding core structure, and the first pole piece includes a protruding portion that protrudes from the second pole piece along the winding direction; the extension direction of the arc structure is the same as the extension direction of the winding core structure, or the extension direction of the arc structure is opposite to the extension direction of the winding core structure. Such same or opposite settings can be set with reference to the relationship between the aforementioned winding core structure and the arc structure 10. In the axial direction of the winding core structure, the portion that protrudes from the second pole piece and the projection of the arc structure at least partially overlap.

[0125] Since the first pole piece exceeds the second pole piece, the first pole piece can fully cover the second pole piece, thereby improving the energy density of the battery. The part exceeding the second pole piece and the arc structure are arranged as above according to the projection relationship. On the basis of improving the energy density of the battery, the magnetic field generated by the arc structure and the magnetic field generated by the exceeding part are opposite, thereby canceling each other out and simulating the generation of an interfering magnetic field.

[0126] In the embodiment of the present application, in order to ensure the connection reliability and thus the sealing and insulation performance of the insulation structure 330 , it is necessary to design the overlapping 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 3, corresponding to the first and second embodiments described above, in this case, the second cover plate 320 is located at the lower side of the first cover plate 310, the first cover plate 310 and the insulating structure 330 form a lead-out channel S, the positive electrode connecting portion 301 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 overlap section W around the adjacent lead-out channel S, and the length L1 of the overlap section W satisfies the relationship:

[0128] L1>0.5mm.

[0129] The lead-out channel S is formed by the aforementioned first through hole 311 and the 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 in total. 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 cover structure 300 has sufficient structural strength, and can improve the sealing performance and insulation performance of the end cover structure 300.

[0130] Similarly, corresponding to the aforementioned third and fourth embodiments, when the second cover plate 320 is located on the upper side of the first cover plate 310, the first cover plate 310 and the insulating structure 330 form a lead-out channel W, the negative electrode connecting 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 overlap section W around the adjacent lead-out channel S, and the length L2 of the overlap section W satisfies the relationship:

[0131] L2>0.5mm.

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

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

[0134] Fig.13 A schematic structural diagram of an arc structure provided according to an embodiment of the present application is shown;

[0135] Fig.14 A schematic structural diagram of another arc-shaped structure provided according to an embodiment of the present application is shown;

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

[0137] It should be noted that the design of the central angle is intended to change the length of the arc segment. It is understandable that when the length of the arc segment is long enough, at least one section of the arc segment can just fit the outer structure of the pole core 200, thereby achieving the purpose of accurately balancing the interference magnetic field. It should be recognized that the length of the arc segment should not be too long to avoid generating a secondary interference magnetic field.

[0138] In addition, combined with the above, it can be known that the arc structure 10 can be formed by opening the arc slot 312 on the first cover plate 310. The distance between the arc slot 312 and the first through hole 311 determines the width of the arc structure 10. Therefore, on the basis of reasonably designing the central angle, the length of the arc 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 reasonably 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 may be selected, and then the arc segment and the pole core 200 may be matched by reasonably arranging the aforementioned insulating structure 330 .

[0140] In some embodiments, please refer to Figure 1 and Figure 3 The first cover plate 310 is also provided with a liquid injection hole 313 , and the liquid injection hole 313 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 Fig.11 , the end cover 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 injection structure. The end cap structure 300 in the embodiment of the present application can switch the injection mode of the battery by changing the position of the injection hole 313. Based on the aforementioned structural form of the end cap structure 300, the position switching of the injection hole 313 is easy to perform and does not affect the inherent performance of the battery.

[0142] In combination with the foregoing, it can be understood that in the embodiments associated with the present application, the positions of the injection hole 313, the arc structure 10 and the positive electrode connecting portion 301 are not limited, and the injection hole 313 can be located between the arc structure 10 and the positive electrode connecting portion 301 (such as Fig.11The injection hole 313 may also be located at the edge of the arc structure 10 and the positive electrode connecting portion 301 (as shown in FIG. Figure 3 shown).

[0143] It should be understood that the edge position refers to the outer edge of the first cover plate 310 , and does not represent 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 first cover plate 310 adjacent to the injection hole 313 satisfies the relationship:

[0145] L3>0.6mm.

[0146] After the end cover structure 300 is installed on the housing 100 , L3 is the distance from the housing 100 to the center of the injection hole 313 . Here, L3>0.6 mm, so 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 includes at least stainless steel, and the end cover structure 300 further includes an injection hole cover 340 , and the injection hole cover 340 is used to close the injection hole 313 .

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

[0149] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0150] In the description of the present application, it should be understood that the terms "including" and "having" and any variations thereof used in the present application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0151] Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed", etc. should be understood in a broad sense, for example, it can be a fixed connection, it can also be a detachable connection, or it can be integrated; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can make the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating 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 the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A battery, characterized in that: The invention comprises a shell, a pole core and an end cover structure, wherein 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 end cover structure seals the opening. The end cap structure comprises: first cover plate; a second cover plate, the second cover plate being stacked with the first cover plate, one of the first cover plate and the second cover plate being formed with a positive electrode connection portion, and the other of the first cover plate and the second cover plate being formed with a negative electrode connection portion; and an insulating structure, the insulating structure being located between the positive electrode connecting portion and the negative electrode connecting portion and forming insulation, at least one of the positive electrode connecting portion and the negative electrode connecting portion comprising an arc structure, the arc structure being arranged concentrically with the pole core, The pole core comprises a first pole piece and a second pole piece, the first pole piece and the second pole piece are stacked and wound to form a winding core structure, and the first pole piece comprises a protruding portion that protrudes beyond the second pole piece along a winding direction; The extending direction of the arc structure is the same as the extending direction of the core structure, or the extending direction of the arc structure is opposite to the extending direction of the core structure.

2. The battery according to claim 1, characterized in that The polarity of the arc structure is the same as the polarity of the first pole piece, or The polarity of the arc structure is the same as the polarity of the first pole piece.

3. The battery according to claim 1, characterized in that The first cover plate is sealingly assembled on the housing, the second cover plate is located on the lower side or the upper side of the first cover plate, and the arc structure is formed on the first cover plate or the second cover plate.

4. The battery according to claim 2, characterized in that The insulating structure is disposed between the first cover plate and the second cover plate.

5. The battery according to any one of claims 1 to 3, characterized in that The first cover plate and the insulating structure form a lead-out channel, the positive electrode connecting portion extends from the lead-out channel, and the first cover plate, the second cover plate and the insulating structure form an overlap section around the lead-out channel, and the length L1 of the overlap section satisfies the relationship: L1>0.5mm.

6. The battery according to any one of claims 1 to 3, characterized in that The arc structure includes an arc segment, and the central angle corresponding to the arc segment is 90° to 270°.

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

8. The battery according to claim 6, characterized in that The first cover plate is formed with an arc-shaped slot hole, 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 structure is formed between the arc-shaped slot hole and the first through hole.

9. The battery according to claim 6, characterized in that Two arc-shaped slots are formed on the first cover plate, and the arc-shaped structure is formed between the two arc-shaped slots.

10. The battery according to claim 6, characterized in that The arc-shaped slot is formed at the edge of the first cover plate, and the arc-shaped slot isolates the edge portion of the first cover plate and forms the arc-shaped structure.

11. The battery according to any one of claims 1 to 3, characterized in that 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 according to claim 10, characterized in that The injection hole is located at the edge of the first cover plate, and the distance L3 between the center of the injection hole and the edge of the first cover plate adjacent to the injection hole satisfies the relationship: L3>0.6mm.

13. The battery according to any one of claims 1 to 3, characterized in that The first cover plate is made of a first material, and the first material at least includes stainless steel.

14. The battery according to any one of claims 1 to 3, characterized in that The battery also includes: A positive electrode adapter, connected to the positive electrode connecting portion; and a negative electrode adapter plate connected to the negative electrode connecting portion, wherein at least one of the positive electrode adapter plate and the negative electrode adapter plate extends out of the housing to form a positioning structure.

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