Step type pole shank, special-shaped battery and terminal equipment

Abstract

The utility model provides a stepped pole shank, a special-shaped battery and terminal equipment, and belongs to the technical field of batteries. The step type pole core comprises a plurality of pole pieces which are arranged in a stacked mode in the first direction. Each pole piece comprises a first shape part and a second shape part, the sizes of the first shape parts and the second shape parts in the second direction are different, the first shape parts of the adjacent pole pieces are mutually laminated, and the second shape parts of the adjacent pole pieces are mutually laminated; wherein the second direction is perpendicular to the first direction. According to the stepped pole core disclosed by the utility model, uniform formation pressure can be applied along the stacking direction, so that the problem of lithium precipitation can be avoided, and a special-shaped battery is ensured to have good working performance.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, and in particular to a stepped pole core, a special-shaped battery and a terminal device. Background Art

[0002] With the development of electronic technology, terminal devices are applied to all aspects of social life. Terminal devices are usually powered by batteries, such as lithium-ion polymer batteries.

[0003] Due to the diversity of the overall appearance of terminal equipment and the differences in the size and position of internal functional modules, only irregularly structured spaces can be used to accommodate batteries. Special-shaped batteries are designed for such battery compartments, such as the stepped special-shaped batteries that can adapt to battery compartments with high and low height differences.

[0004] However, due to structural design defects, the stepped special-shaped battery in the related art is very prone to lithium plating caused by uneven formation pressure, which affects the working performance of the special-shaped battery. Utility Model Content

[0005] The utility model provides a stepped pole core, a special-shaped battery and a terminal device, which can solve the problem that the stepped special-shaped battery is prone to lithium plating caused by uneven formation pressure due to structural design defects, thereby affecting the working performance of the special-shaped battery.

[0006] The technical solution is as follows:

[0007] In one aspect, a stepped pole core is provided, the stepped pole core comprising: a plurality of pole pieces stacked along a first direction;

[0008] The pole piece includes a first shape portion and a second shape portion, the first shape portion and the second shape portion have different sizes along the second direction, the first shape portions of adjacent pole pieces are stacked on each other, and the second shape portions are stacked on each other; wherein the second direction is perpendicular to the first direction.

[0009] In some embodiments, the electrode sheets include positive electrode sheets and negative electrode sheets, and the positive electrode sheets and the negative electrode sheets are alternately stacked along the first direction.

[0010] In some embodiments, the positive electrode sheet is provided with a positive electrode tab, and the negative electrode sheet is provided with a negative electrode tab;

[0011] The positive electrode tab is located on one of the first shape portion and the second shape portion of the positive electrode sheet, the negative electrode tab is located on one of the first shape portion and the second shape portion of the negative electrode sheet, and the positive electrode tab and the negative electrode tab are located at different positions on the electrode sheets.

[0012] In some embodiments, the positive electrode tab and the negative electrode tab are located on the electrode sheet and are spaced apart from each other along the second direction.

[0013] In some embodiments, the two positive electrode tabs on two adjacent positive electrode sheets are electrically connected along the first direction, and the two negative electrode tabs on two adjacent negative electrode sheets are electrically connected along the first direction.

[0014] In some embodiments, the stepped pole core further comprises at least one adapter;

[0015] The at least one adapter is electrically connected to the positive electrode tab or the negative electrode tab, and the at least one adapter is configured to adjust the position and / or angle of the output end of the positive electrode tab or the negative electrode tab.

[0016] In some embodiments, the at least one adapter comprises a first connection portion and a second connection portion;

[0017] The first connection portion is stacked and connected to the positive electrode tab or the negative electrode tab, the second connection portion is electrically connected to the first connection portion, and the second connection portion extends in a direction away from the stepped pole core to serve as an output end of the stepped pole core.

[0018] In some embodiments, the number of the adapters is two, one of which is electrically connected to the positive electrode tab, and the other of which is electrically connected to the negative electrode tab.

[0019] On the other hand, a special-shaped battery is provided, wherein the special-shaped battery comprises the stepped pole core described in the utility model.

[0020] On the other hand, a terminal device is provided, wherein the terminal device comprises the special-shaped battery described in the present utility model.

[0021] The beneficial effects brought by the technical solution provided by the utility model include at least:

[0022] The stepped pole core of the utility model comprises a plurality of pole pieces stacked along a first direction, each pole piece comprises a first shape portion and a second shape portion, the first shape portion and the second shape portion have different sizes along the second direction, during the stacking process, the first shape portions on adjacent pole pieces are stacked on each other, and the second shape portions on adjacent pole pieces overlap each other. Since the sizes of the first shape portion and the second shape portion are different, the pole core formed by stacking has two sizes in the second direction, has a stepped shape feature, and can meet the stacking requirements of step-shaped battery compartments; the shape of each pole piece is the same, and a uniform formation pressure can be applied along the stacking direction (i.e., the first direction), thereby avoiding the problem of lithium plating and ensuring that the special-shaped battery has good working performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a schematic diagram of the structure of the stepped pole core provided by an embodiment of the utility model;

[0025] Figure 2 This is an exploded view of the structure of the stepped pole core provided by the embodiment of the utility model;

[0026] Figure 3 It is a structural schematic diagram of a stepped pole core provided by another embodiment of the utility model;

[0027] Figure 4 It is a structural explosion diagram of a stepped pole core provided in another embodiment of the utility model.

[0028] The reference numerals in the figures represent respectively:

[0029] 100. Stepped pole core;

[0030] 1001. Step area;

[0031] 1. Pole piece;

[0032] 101, positive electrode plate; 1011, positive electrode tab; 102, negative electrode plate; 1021, negative electrode tab;

[0033] 11. first shape portion; 12. second shape portion;

[0034] 2. Adapter;

[0035] 21. first connecting portion; 22. second connecting portion;

[0036] A. First direction; B. Second direction. DETAILED DESCRIPTION

[0037] Here, exemplary embodiments will be described in detail, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the utility model. Instead, they are only examples of devices and methods consistent with some aspects of the utility model as detailed in the attached claims.

[0038] In the description of the present invention, 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", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0039] It should be understood that in the present utility model, "electrical connection" can be understood as the physical contact and electrical conduction of components; it can also be understood as the form in which different components in the circuit structure are connected through physical lines such as printed circuit board (PCB) copper foil or wires that can transmit electrical signals. "Communication connection" can refer to electrical signal transmission, including wireless communication connection and wired communication connection. Wireless communication connection does not require a physical medium and does not belong to a connection relationship that limits the product structure. "Connection" and "connected" can both refer to a mechanical connection relationship or a physical connection relationship, that is, A is connected to B or A is connected to B, which can mean that there is a fastening component (such as screws, bolts, rivets, etc.) between A and B, or A and B are in contact with each other and A and B are difficult to separate.

[0040] Unless otherwise defined, all technical terms used in the embodiments of the present invention have the same meanings as commonly understood by those skilled in the art.

[0041] The core refers to the active material part of the positive and negative electrodes inside the battery that is responsible for the electrochemical reaction. It is a key component of the battery. The role of the core is to participate in the electrochemical reaction of the battery and generate or store electrical energy.

[0042] In the process of battery preparation, it is necessary to form a stable solid electrolyte layer (Solid Electrolyte Interphase, SEI) through formation. The solid electrolyte layer can play a very important role in the stability of the battery in the electrochemical reaction of the lithium-ion battery. In the formation process, it is necessary to use a formation jig to apply formation pressure to the pole core along the stacking direction. Whether the formation pressure is uniformly applied to the entire pole core is crucial to the formation effect.

[0043] The stepped pole core in the related technology is usually formed by stacking two pole cores, one large and one small. However, due to the limited size of the junction between the large pole core and the small pole core (or the step gap), the formation fixture may not be able to press it tightly, which causes the formation pressure at the junction to be smaller than other areas. The pole core faces the problem of uneven formation pressure, which may lead to lithium plating problems and affect the battery's working performance.

[0044] Therefore, the utility model provides a stepped pole core, which utilizes the two sizes of the pole piece in the second direction to obtain a stepped shape feature, and each pole piece has the same shape, and can apply uniform formation pressure along the first direction (that is, the stacking direction), thereby avoiding the problem of lithium plating and ensuring that the special-shaped battery has good working performance.

[0045] The utility model provides a terminal device. Specifically, the electronic device can be any of various types of computer system devices that are mobile or portable. Specifically, the electronic device can be a mobile phone or a smart phone (for example, a phone based on iPhone TM, a phone based on Android TM), a portable game device (for example, Nintendo DS TM, PlayStation Portable TM, Gameboy Advance TM, iPhone TM), a laptop computer, a PDA, a portable Internet device, a music player, and a data storage device, other handheld devices, and headsets, etc. The electronic device can also be other battery-powered wearable devices (for example, head-mounted devices (HMD) such as electronic bracelets, electronic necklaces, electronic devices, or smart watches).

[0046] The electronic device can also be any one of a plurality of electronic devices, including but not limited to cellular phones, smart phones, other wireless communication devices, personal digital assistants, audio players, other media players, music recorders, video recorders, other media recorders, radios, medical devices, vehicle transportation instruments, calculators, programmable remote controls, pagers, laptop computers, desktop computers, printers, netbook computers, personal digital assistants (PDAs), portable multimedia players (PMPs), Moving Picture Experts Group (MPEG-1 or MPEGG-2) Audio Layer 3 (MP3) players, portable medical devices, and digital cameras and combinations thereof.

[0047] In some cases, the electronic device can perform multiple functions (e.g., play music, display video, store pictures, and receive and send phone calls). If desired, the electronic device can be a device such as a cellular phone, a media player, other handheld device, a wristwatch device, a pendant device, a handset device, or other compact portable device.

[0048] In order to make the purpose, technical solution and advantages of the present invention more clear, the implementation mode of the present invention will be further described in detail below with reference to the accompanying drawings.

[0049] On the one hand, combined with Figure 1 , 2 As shown, this embodiment provides a stepped pole core 100, and the stepped pole core 100 includes: a plurality of pole pieces 1 stacked along a first direction.

[0050] The pole piece 1 includes a first shape portion 11 and a second shape portion 12. The first shape portion 11 and the second shape portion 12 have different sizes along the second direction B. The first shape portions 11 of adjacent pole pieces 1 are stacked on each other, and the second shape portions 12 are stacked on each other; wherein the second direction B is perpendicular to the first direction A.

[0051] The stepped pole core 100 of the present embodiment comprises a plurality of pole pieces 1 stacked along a first direction A, each pole piece 1 comprising a first shape portion 11 and a second shape portion 12, the sizes of the first shape portion 11 and the second shape portion 12 along the second direction B being different, during the stacking process, the first shape portions 11 on adjacent pole pieces 1 are stacked on each other, and the second shape portions 12 on adjacent pole pieces 1 overlap each other, and due to the different sizes of the first shape portion 11 and the second shape portion 12, the stacked pole core has two sizes in the second direction B, and has a stepped shape feature, which can meet the stacking requirements of step-shaped battery compartments; each pole piece 1 has the same shape, and a uniform formation pressure can be applied along the first direction A, thereby avoiding the problem of lithium plating and ensuring that the special-shaped battery has good working performance.

[0052] By using the two sizes of the pole piece 1 in the second direction B, a stepped structure with staggered heights can be constructed for the stepped movement, for example Figure 1 Step area shown.

[0053] Exemplarily, the size of the first shape portion 11 along the second direction B is L1, and the size of the second shape portion 12 along the second direction B is L2, wherein L2 is greater than L1, so that the thickness of the partially stepped pole core 100 formed by stacking the second shape portions 12 is greater than the partially stepped pole core 100 formed by stacking the first shape portions 11, and the second shape portions 12 are stacked to form Figure 1 Step area shown.

[0054] In some possible implementations, the second direction B is any direction perpendicular to the first direction A, that is, the second direction B is any direction in a plane perpendicular to the first direction A. In addition, it can be explained that the second direction B can also be one direction or multiple directions, so that the pole piece 1 can be stacked to form a more complex step-shaped structural feature.

[0055] In addition, in the present embodiment, the pole piece 1 does not only include the first shape portion 11 and the second shape portion 12, but may also include a third shape portion (not shown in the figure). The size of the third shape portion along the second direction B is different from the size of at least one of the first shape portion 11 and the second shape portion 12 along the second direction B, so that the pole piece 1 can be stacked to form a more complex step-shaped structural feature.

[0056] Combination Figure 2 As shown, in some embodiments, the electrode sheet 1 includes a positive electrode sheet 101 and a negative electrode sheet 102 , and the positive electrode sheet 101 and the negative electrode sheet 102 are alternately stacked along a first direction A.

[0057] Wherein, illustratively, the positive electrode plate 101 is composed of metal oxide, lithium iron phosphate, ternary materials, etc., and its function is to provide parameters such as the embedding and de-embedding efficiency and discharge capacity of the positive electrode material for lithium ions. Optionally, the positive electrode plate 101 is made of materials such as lithium cobalt oxide, lithium iron phosphate, lithium iron, ternary materials, etc.

[0058] In another exemplary embodiment, the negative electrode plate 102 is composed of materials such as graphite and carbon, and its function is to provide parameters such as the embedding and de-embedding efficiency and discharge capacity of the negative electrode material for lithium ions. Optionally, the negative electrode plate 102 is made of graphite.

[0059] In some possible implementations, the stepped pole core 100 further includes a separator and an electrolyte, wherein the separator is located between each positive electrode sheet 101 and each negative electrode sheet 102, and is a key material for separating the positive and negative electrodes, and its function is to limit the direct movement of lithium ions in the electrolyte between the positive and negative electrodes, while allowing the ions in the electrolyte to move between the positive and negative electrodes. The electrolyte is filled between the positive electrode sheet 101, the negative electrode sheet 102 and the separator, and serves as a medium for the lithium ions to pass through. For example, the electrolyte is a liquid or a polymer film, and the quality of the electrolyte is crucial to the performance and stability of the lithium battery.

[0060] Combination Figure 2 As shown, in some embodiments, the positive electrode sheet 101 is provided with a positive electrode tab 1011 , and the negative electrode sheet 102 is provided with a negative electrode tab 1021 .

[0061] The positive electrode tab 1011 is located on one of the first shape portion 11 and the second shape portion 12 of the positive electrode sheet 101 , and the negative electrode tab 1021 is located on one of the first shape portion 11 and the second shape portion 12 of the negative electrode sheet 102 , and the positive electrode tab 1011 and the negative electrode tab 1021 are located at different positions on the electrode sheet 1 .

[0062] Through the above arrangement, the stepped pole core 100 can use the positive pole tab 1011 and the negative pole tab 1021 as the input or output port of electric energy. For example, the positive pole tab 1011 can be arranged on the second first shape portion 11 or the second shape portion 12 of the positive pole sheet 101, and the negative pole tab 1021 can be arranged on the first shape portion 11 and the second shape portion 12 of the negative pole sheet 102.

[0063] In addition, the position of the positive electrode tab 1011 on the positive electrode sheet 101 is different from the position of the negative electrode tab 1021 on the negative electrode sheet 102 in order to ensure that the positive electrode tab 1011 and the negative electrode tab 1021 have a sufficient safety distance after the positive electrode sheet 101 and the negative electrode sheet 102 are stacked.

[0064] Combination Figure 1 , 2 As shown, in some embodiments, the positions of the positive pole tab 1011 and the negative pole tab 1021 on the pole piece 1 are spaced apart from each other along the second direction B. In the stepped pole core 100 of this embodiment, the positions of the positive pole tab 1011 and the negative pole tab 1021 are spaced apart along the second direction B, and the positive pole tab 1011 and the negative pole tab 1021 have a sufficient safety distance.

[0065] Combination Figure 1 As shown, in some embodiments, two positive electrode tabs 1011 on two adjacent positive electrode sheets 101 are electrically connected along the first direction A, and two negative electrode tabs 1021 on two adjacent negative electrode sheets 102 are electrically connected along the first direction A.

[0066] In this embodiment, after the positive electrode sheet 101 and the negative electrode sheet 102 are stacked, the positive electrode tabs 1011 of all the positive electrode sheets 101 can also be stacked and electrically connected to each other along the first direction A, and the negative electrode tabs 1021 of all the negative electrode sheets 102 can be stacked and electrically connected to each other along the first direction A, thereby facilitating the connection of the positive and negative electrodes of the stepped pole core 100 with the outside.

[0067] In some examples, two positive electrode tabs 1011 on two adjacent positive electrode sheets 101 are connected by welding, and two negative electrode tabs 1021 on two adjacent negative electrode sheets 102 are connected by welding.

[0068] Combination Figure 3 , 4 As shown, in some embodiments, the stepped pole core 100 also includes at least one adapter 2; at least one adapter 2 is electrically connected to the positive pole tab 1011 or the negative pole tab 1021, and at least one adapter 2 is configured to adjust the position and / or angle of the output end of the positive pole tab 1011 or the negative pole tab 1021.

[0069] Taking into account that the stepped pole core 100 of the present embodiment has made significant improvements to the stacking direction of the pole sheets 1, the positive pole sheets 101 and the negative pole sheets 102 are both stacked and connected along the first direction A, but the power connection structure of the external functional module may not be able to adapt to the positive pole sheets 101 or the negative pole sheets 102 in this stacking direction. Therefore, the adapter 2 is electrically connected to the positive pole ear 1011 or the negative pole ear 1021, and the adapter 2 is used to adjust the position and / or angle of the output end of the positive pole ear 1011 or the negative pole ear 1021, so that the stepped pole core 100 of the present embodiment can adapt to the power connection structure of the external functional module.

[0070] Combination Figure 4 As shown, in some embodiments, at least one adapter 2 includes a first connecting portion 21 and a second connecting portion 22; the first connecting portion 21 is stacked and connected to the positive pole tab 1011 or the negative pole tab 1021, and the second connecting portion 22 is electrically connected to the first connecting portion 21, and the second connecting portion 22 extends in a direction away from the stepped pole core 100, serving as an output end of the stepped pole core 100.

[0071] Through the above arrangement, the positive electrode tab 1011 or the negative electrode tab 1021 can be connected to the first connection portion 21 of the adapter 2 in a stacked manner along the first direction A, such as by welding, and the first connection portion 21 uses the second connection portion 22 as the output end of the stepped pole core 100. Exemplarily, the extension direction of the second connection portion 22 is parallel to the first direction A, which is more in line with the power connection structure of the external module.

[0072] Combination Figure 3 , 4 As shown, in some embodiments, there are two adapters 2, one of which is electrically connected to the positive electrode tab 1011, and the other of which is electrically connected to the negative electrode tab 1021. Thus, the positions and angles of the positive electrode tab 1011 and the negative electrode tab 1021 can be adjusted by using the adapters 2, respectively, to reduce the difficulty of connecting the external module.

[0073] Among them, the two first connecting parts 21 of the adapter 2 corresponding to the positive electrode tab 1011 are electrically connected to the two outermost positive electrode tabs 1011 along the first direction A respectively; the two first connecting parts 21 of the adapter 2 corresponding to the negative electrode tab 1021 are electrically connected to the two outermost negative electrode tabs 1021 along the first direction A respectively.

[0074] On the other hand, this embodiment provides a special-shaped battery, which includes the stepped pole core 100 of the utility model. The special-shaped battery of this embodiment adopts the stepped pole core 100 of the utility model, and has all the beneficial technical effects of all the embodiments herein. Exemplarily, the special-shaped battery is a lithium battery.

[0075] On the other hand, this embodiment provides a terminal device, which includes the special-shaped battery of the utility model. The terminal device of this embodiment adopts the special-shaped battery of the utility model and has all the beneficial technical effects of all the embodiments herein.

[0076] The terminal device in this embodiment can be a mobile phone, a tablet computer, a laptop computer, a smart bracelet, a smart watch, a smart helmet, smart glasses, etc.

[0077] It should be noted that the "several" and "at least one" mentioned in this article refer to one or more, and "multiple" and "at least two" refer to two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0079] In some possible implementations, the terminal device may also include a radio frequency (RF) circuit, a memory including one or more computer-readable storage media, an input unit, a display unit, a sensor, an audio circuit, a Wi-Fi module, a processor including one or more processing cores, and other components.

[0080] In the description of this specification, the reference terms "certain embodiments", "one embodiment", "some embodiments", "illustrative embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention.

[0081] The above description is only an embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A stepped pole core, characterized in that: The stepped pole core (100) comprises: a plurality of pole pieces (1) stacked and arranged along a first direction; The pole piece (1) comprises a first shape portion (11) and a second shape portion (12); the first shape portion (11) and the second shape portion (12) have different sizes along a second direction; the first shape portions (11) of adjacent pole pieces (1) are stacked on top of each other, and the second shape portions (12) are stacked on top of each other; wherein the second direction is perpendicular to the first direction.

2. The stepped pole core according to claim 1, characterized in that: The pole piece (1) comprises a positive pole piece (101) and a negative pole piece (102), and the positive pole piece (101) and the negative pole piece (102) are alternately stacked along the first direction.

3. The stepped pole core according to claim 2, characterized in that: The positive electrode sheet (101) is provided with a positive electrode tab (1011), and the negative electrode sheet (102) is provided with a negative electrode tab (1021); The positive electrode tab (1011) is located on one of the first shape portion (11) and the second shape portion (12) of the positive electrode sheet (101), and the negative electrode tab (1021) is located on one of the first shape portion (11) and the second shape portion (12) of the negative electrode sheet (102), and the positions of the positive electrode tab (1011) and the negative electrode tab (1021) on the electrode sheet (1) are different.

4. The stepped pole core according to claim 3, characterized in that: The positions of the positive electrode tab (1011) and the negative electrode tab (1021) on the pole sheet (1) are spaced apart from each other along the second direction.

5. The stepped pole core according to claim 2, characterized in that: The two positive electrode tabs (1011) on the two adjacent positive electrode sheets (101) are electrically connected along the first direction, and the two negative electrode tabs (1021) on the two adjacent negative electrode sheets (102) are electrically connected along the first direction.

6. The stepped pole core according to claim 3 or 4, characterized in that: The stepped pole core (100) further comprises at least one adapter (2); The at least one adapter (2) is electrically connected to the positive electrode tab (1011) or the negative electrode tab (1021), and the at least one adapter (2) is configured to adjust the position and / or angle of the output end of the positive electrode tab (1011) or the negative electrode tab (1021).

7. The stepped pole core according to claim 6, characterized in that: The at least one adapter (2) comprises a first connecting portion (21) and a second connecting portion (22); The first connection portion (21) is stacked and connected to the positive electrode tab (1011) or the negative electrode tab (1021), the second connection portion (22) is electrically connected to the first connection portion (21), and the second connection portion (22) extends in a direction away from the stepped pole core (100) to serve as an output end of the stepped pole core (100).

8. The stepped pole core according to claim 6, characterized in that: The number of the adapters (2) is two, one of which is electrically connected to the positive electrode tab (1011), and the other of which is electrically connected to the negative electrode tab (1021).

9. A special-shaped battery, characterized in that: The special-shaped battery comprises the stepped pole core (100) according to any one of claims 1 to 8.

10. A terminal device, characterized in that: The terminal device comprises the special-shaped battery according to claim 9.

Images