Battery pin structure and battery monomer

Abstract

The application discloses a battery pin structure and a battery monomer. The battery pin structure comprises: a pole column connecting part used for electrically connecting with a pole column of a battery; a tab connecting part used for electrically connecting with a tab of the battery; and a conductive transition part connected between the pole column connecting part and the tab connecting part in a first direction; wherein at least part of the conductive transition part is arranged in multiple bending modes to form a multi-layered laminated structure in a second direction perpendicular to the first direction. The laminated structure is formed by bending, the equivalent cross-sectional area is doubled in a limited projection area, the current carrying capacity is improved, and the resistance and heat generation are reduced.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery pin structure and a battery cell. Background Technology

[0002] In the field of battery technology, with the rapid development of fast charging technology, more stringent requirements have been placed on the current carrying capacity of battery pins. As a key component for current transmission between the internal terminals and tabs of the battery, the battery pins affect the stability, safety, and overall efficiency of the battery during fast charging.

[0003] In related technologies, battery pins typically employ a single-layer structure. Due to the limited cross-sectional area of ​​this type of pin, when transmitting a large current, the current passing through the pin generates a significant amount of heat, leading to an increase in the internal temperature of the battery and affecting its overall performance and safety. Utility Model Content

[0004] This application provides a battery pin structure and a battery cell to at least partially solve the above-mentioned technical problems.

[0005] In a first aspect, embodiments of this application provide a battery pin structure, including: a terminal connection portion for electrical connection with the terminal of a battery; a tab connection portion for electrical connection with the tab of a battery; and a conductive transition portion connected between the terminal connection portion and the tab connection portion along a first direction; wherein at least a portion of the conductive transition portion is bent multiple times to form a multi-layered structure in a second direction perpendicular to the first direction. By forming a multi-layered structure through bending, the equivalent cross-sectional area is multiplied within a limited projected area, thereby improving current carrying capacity and reducing resistance and heat generation.

[0006] Optionally, the laminated structure is formed by reciprocating bending of at least a portion of the conductive transition portion along a first direction. Using this reciprocating bending method simplifies the manufacturing process, improves production efficiency, and simultaneously achieves a significant increase in the equivalent cross-sectional area.

[0007] Optionally, the conductive transition portion is a strip-shaped structure, having a first end and a second end disposed opposite to each other along a first direction; the first end is connected to the electrode post connection portion, and the second end is connected to the electrode tab connection portion. The strip-shaped structure facilitates bending processing, which helps to ensure processing quality and consistency, and improves production efficiency.

[0008] Optionally, the first end and the second end are on the same plane in the second direction. The flush design at both ends allows the tab connection to fit the core pack more closely, reducing the space occupied by the battery pins and improving the utilization rate of the internal space of the battery.

[0009] Optionally, the stacked structure includes two bent units arranged side-by-side and interconnected along a first direction; and at least one bent unit is a multi-layered stacked structure. One end of the bent unit near the pole post connection constitutes the first end, and one end of the bent unit near the pole tab connection constitutes the second end. By combining the two bent units, the equivalent cross-sectional area is increased within a limited area, while ensuring structural compactness and stability.

[0010] Optionally, both bending units are multi-layered structures formed by repeatedly bending a portion of the conductive transition section along the first direction. This further increases the equivalent cross-sectional area of ​​the conductive transition section and enhances the pin's current-carrying capacity.

[0011] Optionally, the two bending units have opposite reciprocating bending directions along the first direction. Opposite bending directions simplify the manufacturing process, ensure smooth connection between adjacent stacked structures, and improve the stability and reliability of the battery pin structure.

[0012] Optionally, multiple points of contact are formed between the two bending units. These multiple points of contact create a tight conductive channel, reducing problems with current transmission, making the current distribution more uniform, reducing local resistance, and improving conductivity.

[0013] Optionally, at least one of the following conditions must be met: the number of bending units is not less than three; the number of overlapping layers of two bending units is equal; the thickness of two bending units in the second direction is equal; the length of two bending units in the first direction is equal; the width of two bending units in the third direction is equal, and the third direction intersects the first and second directions respectively. The symmetrical design reduces current transmission resistance, lowers energy loss, makes current distribution more uniform, and improves conductivity.

[0014] Optionally, the layers of the laminated structure are fixedly connected by high-temperature diffusion bonding or conductive adhesive filling. High-temperature diffusion bonding or conductive adhesive filling ensures tight bonding between layers, improving reliability and stability while guaranteeing efficient current transmission.

[0015] Optionally, at least one of the following conditions must be met: the electrode connection portion and the conductive transition portion are arranged in an L-shaped bend structure; the electrode connection portion includes a middle section and a first side section and a second side section respectively connected to the middle section along a third direction, the middle section is connected to the conductive transition portion, and the third direction intersects the first direction and the second direction respectively. The L-shaped bend structure makes reasonable use of the internal space of the battery and reduces the space occupied by the pins; the electrode connection portion design provides sufficient welding space to ensure reliable current transmission.

[0016] Secondly, embodiments of this application provide a battery cell including any of the aforementioned battery pin structures. By employing the aforementioned battery pin structure, the battery cell improves current carrying capacity, reduces resistance and heat generation, and enhances battery fast-charging performance and stability.

[0017] In the battery pin structure of this application embodiment, the conductive transition portion forms a multi-layered structure in the second direction z by multiple bends, achieving a doubling of the equivalent cross-sectional area within a limited projected area. When current flows from the terminal connection portion through the conductive transition portion to the tab connection portion, the increased equivalent cross-sectional area can significantly improve the pin's current carrying capacity, reduce the resistance when current passes through, and reduce the heat generated by the resistance. This meets the higher requirements of current carrying capacity of battery pins in current fast charging technology and improves the overheating and efficiency reduction problems caused by the limited cross-sectional area of ​​single-layer pins in related technologies.

[0018] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0020] Figure 1 This is a three-dimensional schematic diagram of the battery pin structure provided in the embodiments of this application; Figure 2 This is a front view schematic diagram of the battery pin structure provided in an embodiment of this application; Figure 3 yes Figure 2 Enlarged view of the location; Figure 4 This is a three-dimensional schematic diagram of the battery pin structure provided in the embodiments of this application from another perspective; Figure 5 This is a right view of the battery pin structure provided in the embodiments of this application; Explanation of reference numerals in the attached figures: 1. Battery pin structure; 10. Pole post connection part; 11. Electrode connection part; 110. Middle section; 111. First side section; 112. Second side section; 12. Conductive transition section; 120. Stacked structure; 1201. First end; 1202. Second end; 121. Bending unit. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0022] In this embodiment, when the battery pin structure 1 is mounted on the core pack, the conductive transition portion 12 and the tab connection portion 11 are close to the first sidewall of the core pack, and the terminal post connection portion 10 is close to the second sidewall of the core pack adjacent to the first sidewall. For ease of description, the first direction x is defined as parallel to the first sidewall of the core pack, and the second direction z is defined as perpendicular to the first sidewall. The third direction y is defined as parallel to the first sidewall and perpendicular to the first direction x. Figure 1 As shown.

[0023] In related technologies, battery pins typically employ a single-layer structure. Due to the limited cross-sectional area of ​​this type of pin, when transmitting a large current, the current passing through the pin generates a significant amount of heat, leading to an increase in the internal temperature of the battery and affecting its overall performance and safety.

[0024] Regarding the above technical issues, firstly, refer to Figure 1 This application provides a battery pin structure 1, including: a terminal connection portion 10 for electrical connection with the terminal of a battery; a tab connection portion 11 for electrical connection with the tab of a battery; and a conductive transition portion 12 connected between the terminal connection portion 10 and the tab connection portion 11 along a first direction x; wherein at least a portion of the conductive transition portion 12 is bent multiple times to form a multi-layered structure 120 in a second direction z perpendicular to the first direction x.

[0025] In this embodiment, the conductive transition portion 12 forms a multi-layered structure 120 in the second direction z by multiple bending, achieving a multiplication of the equivalent cross-sectional area within a limited projected area. When current flows from the terminal connection portion 10 through the conductive transition portion 12 to the tab connection portion 11, the increased equivalent cross-sectional area can significantly improve the pin's current carrying capacity, reduce the resistance when current flows, and reduce the heat generated by the resistance. This meets the higher requirements of current fast charging technology for battery pin current carrying capacity and improves the overheating and efficiency reduction problems caused by the limited cross-sectional area of ​​single-layer pins in related technologies.

[0026] For example, the conductive transition portion 12 is a single-layer metal strip, and the middle part of the conductive transition portion 12 is bent multiple times. First, it is bent 180 degrees along the first direction x to form a U-shaped bend segment, and then bent 180 degrees along the opposite direction to form another U-shaped bend segment, and so on, until a multi-layered stacked structure 120 is finally formed in the second direction z. This achieves a doubling of the equivalent cross-sectional area.

[0027] For example, the conductive transition portion 12 is a single-layer metal strip, which is then helically bent. Starting from one end of the conductive transition portion 12, it extends helically along the second direction z with a certain pitch, gradually forming a multi-layered helical stacked structure 120, thus achieving a multiplication of the equivalent cross-sectional area.

[0028] Both of the above specific examples can achieve multiple bending of at least part of the conductive transition portion 12 to form a multi-layered stacked structure 120 in the second direction z perpendicular to the first direction x.

[0029] For example, the total thickness of the stacked structure 120 in the second direction z is 2 to 5 times the original thickness of the conductive transition portion 12. This achieves a doubling of the equivalent cross-sectional area within a finite projected area.

[0030] For example, the thickness of the metal strip is 0.5 mm to 2.0 mm. If the thickness is too small, it cannot meet the flow requirements; if the thickness is too large, it is not easy to fold.

[0031] In some embodiments, reference Figure 2 , Figure 3 The stacked structure 120 is formed by at least a portion of the conductive transition portion 12 being bent back and forth along the first direction x.

[0032] Understandably, the middle portion of the conductive transition section 12 can be bent 180 degrees along the first direction x to form a U-shaped bend, and then bent 180 degrees in the opposite direction to form another U-shaped bend, and so on. Through this reciprocating bending method along the first direction x, the conductive transition section 12 forms a multi-layered structure 120 in the second direction z, which is perpendicular to the first direction x.

[0033] In this embodiment, a multi-layered structure 120 is formed by reciprocating bending along the first direction x, and multiple layers are stacked in the second direction z. This eliminates the need to increase the area of ​​the battery pins in the projection direction, making full use of the space perpendicular to the current transmission direction. The equivalent cross-sectional area of ​​the conductive transition portion 12 is increased within a limited space, thereby making the internal structure of the battery more compact and reasonable.

[0034] Furthermore, the operation of repeatedly bending along the first direction x to form the stacked structure 120 facilitates the formation of the stacked structure 120 using the stamping process, thereby improving production efficiency and reducing production costs.

[0035] In some embodiments, reference Figure 2 , Figure 3 The conductive transition portion 12 is a strip-shaped structure, having a first end 1201 and a second end 1202 disposed opposite to each other along the first direction x; the first end 1201 is integrally connected to the pole post connecting portion 10, and the second end 1202 is integrally connected to the tab connecting portion 11.

[0036] In this embodiment, since the conductive transition portion 12 is extended in a strip shape, the middle part of the strip structure can be bent multiple times in a relatively regular manner, which is beneficial to ensure processing quality and consistency and improve production efficiency. For example, the ratio of the length of the stacked structure in the first direction x to the original length of the conductive transition portion 12 is 0.2 to 0.5. By reasonably controlling the ratio, the shape and size of the stacked structure can be adjusted, thereby optimizing the performance of the battery pins.

[0037] Furthermore, the first end 1201 is integrally connected to the terminal post connection part 10, and the second end 1202 is integrally connected to the tab connection part 11, so that the terminal post connection part 10, the conductive transition part 12 and the tab connection part 11 form a whole. The complete battery pin structure 1 is directly manufactured through the stamping process, which reduces the production process and process steps, thereby effectively reducing the production cost and improving the production efficiency.

[0038] In some embodiments, reference Figure 2 , Figure 3 The first end 1201 and the second end 1202 are in the same plane in the second direction z.

[0039] In this embodiment, since the first end 1201 and the second end 1202 are on the same plane, there is no height difference between the two ends of the stacked structure 120. Based on this, the tab connection portion 11 can be flush with the bottommost layer of the stacked structure 120, allowing the tab connection portion 11 to fit more tightly against the core pack. When the core pack with the battery pin structure 1 is inserted into the battery casing, the tight fit between the tab connection portion 11 and the core pack reduces the space occupied by the battery pins, allowing for more efficient use of the originally limited space inside the battery.

[0040] For example, the tab connection portion 11 includes a middle section 110 and a first side section 111 and a second side section 112 respectively connected to the middle section on both sides along a third direction. These two side sections are used for welding to the tab, increasing the welding area. After welding is completed, before placing the tab connection portion 11 into the battery casing, the first side section 111 and the second side section 112 are stacked on the middle section 110. Since the tab connection portion 11 is flush with the bottom layer of the stacked structure 120, a stacking space for the first side section 111 and the second side section 112 is reserved. Even after the first side section 111 and the second side section 112 are stacked, they do not exceed the stacked structure 120, thereby improving the utilization rate of the battery's internal space.

[0041] In some embodiments, reference Figure 2 , Figure 3 The stacked structure 120 includes two bending units 121 arranged side by side and connected to each other along the first direction x; and at least one bending unit 121 is a multi-layer stacked structure; wherein, one end of the bending unit 121 near the pole post connection portion 10 constitutes the first end 1201, and one end of the bending unit 121 near the pole tab connection portion 11 constitutes the second end 1202.

[0042] In this embodiment, during the formation of the stacked structure 120, at least a portion of the conductive transition portion 12 is first subjected to multiple bending operations, causing one of the bending units 121 to form a multi-layered stacked structure, thereby achieving a significant increase in the equivalent cross-sectional area within a limited projected area. Then, another bending unit 121 is connected to the bending unit 121 that has already formed a multi-layered stacked structure. Through bending control, one end of the bending unit 121 near the terminal post connection portion 10 forms the first end 1201, and one end of the bending unit 121 near the electrode tab connection portion 11 forms the second end 1202. Simultaneously, the first end 1201 and the second end 1202 are kept flush, allowing the electrode tab connection portion 11 to fit more closely to the battery pack, reducing the space occupied by the battery pins.

[0043] In some embodiments, reference Figure 2 , Figure 3 Both bending units 121 are multi-layered structures formed by reciprocating bending of the partially conductive transition portion 12 along the first direction x.

[0044] In this embodiment, both bending units 121 are multi-layered stacked structures, which further increases the equivalent cross-sectional area of ​​the conductive transition portion 12 and improves the current carrying capacity of the pin.

[0045] In some embodiments, the two bending units 121 have opposite reciprocating bending directions along the first direction x.

[0046] In this embodiment, since both bending units 121 are multi-layered stacked structures, their reciprocating bending directions along the first direction x are opposite, placing them at the same level at the end-to-end connection. This eliminates the need for bending at the end-to-end connection to ensure a smooth connection, simplifying the manufacturing process. Furthermore, the connection between adjacent stacked structures 120 is smoother, resulting in a more compact and rational spatial layout, further improving the utilization rate of the battery's internal space.

[0047] In some embodiments, multiple points of contact are formed between the two bending units 121.

[0048] In this embodiment, since both bending units 121 are multi-layered composite structures and their bending directions are opposite in the second direction z, the two bending units 121 are positioned opposite each other at the bend. At this time, by applying adhesive to the bend or using high-temperature diffusion bonding, the two bending units 121 achieve multi-point contact at the bend, forming a tightly connected overall conductive channel in space. This reduces the problem of poor current transmission caused by structural abrupt changes, allowing the current to be distributed and transmitted more evenly and smoothly throughout the entire composite structure 120, reducing local resistance, and thus significantly improving conductivity.

[0049] In some embodiments, the bending unit 121 has at least three layers. The multilayer structure can effectively reduce resistance during current transmission, reduce energy loss, and improve the conductivity of the battery pin structure 1.

[0050] In some embodiments, the two bending units 121 have the same number of stacked layers, resulting in similar resistance characteristics during current transmission. As the current passes through these two bending units 121, it can be more evenly distributed across the layers, addressing the problem of localized current concentration or uneven distribution caused by differences in the number of layers.

[0051] In some embodiments, the two bending units 121 have the same thickness in the second direction z. Having two bending units 121 with equal thickness in the second direction z allows for more efficient use of space, avoiding space waste or structural interference caused by thickness differences.

[0052] In some embodiments, the two bending units 121 have equal lengths in the first direction x; the two bending units 121 have equal widths in the third direction y, which intersects the first direction x and the second direction z, respectively. That is, the two bending units 121 are symmetrically arranged, making the current distribution more uniform.

[0053] In some embodiments, reference Figure 4 , Figure 5 The pole connection part 10 is provided with a pole connection hole.

[0054] In this embodiment, a terminal connection hole is provided in the terminal connection portion 10, providing an installation structure for the battery terminal and the battery pin structure 1. During installation, the battery terminal is passed through the terminal connection hole, so that the battery terminal and the terminal connection portion 10 fit tightly together, ensuring that the battery pin structure 1 can be securely connected to the battery terminal.

[0055] In some embodiments, the layers of the stacked structure 120 are fixedly connected by high-temperature diffusion bonding.

[0056] In this embodiment, a high-temperature diffusion bonding method is employed. The laminated structure 120 is pressurized at 5-50 MPa at a temperature of 200-400°C and held at that temperature for 10-60 minutes to achieve high-temperature diffusion bonding. During this process, the atoms of each layer of material gain sufficient energy to diffuse, forming a metallurgical bond between the layers. Compared to ordinary physical connections, metallurgical bonding has a higher bonding strength, ensuring a tight connection between the layers of the laminated structure 120. This reduces the likelihood of delamination or loosening during battery use, significantly improving the reliability and stability of the battery pin structure 1.

[0057] Furthermore, the interlayer thermal conductivity is increased to over 200 W / mK through metallurgical bonding, which is three times higher than that of simple physical contact. During battery operation, current transmission generates heat. The high thermal conductivity stacked structure 120 can quickly conduct heat away from the generation site along the axial direction, preventing heat accumulation in local areas and reducing the battery's operating temperature.

[0058] In some embodiments, the layers of the laminated structure 120 are fixedly connected by filling with a conductive adhesive.

[0059] In this embodiment, nano-silver paste is used. Alternatively, tin-based solder paste, with a thickness ≤20μm, is used as a conductive adhesive to fill the spaces between the layers of the laminated structure 120. Nano-silver paste has extremely low resistivity, ensuring efficient current transmission between layers and reducing contact resistance; tin-based solder paste, after melting, fills the tiny gaps between layers, forming a good conductive path. Both conductive adhesives provide reliable conductive connections for the laminated structure 120, ensuring stable conductivity of the battery pin structure 1.

[0060] In some embodiments, reference Figure 4 The pole connection 10 and the conductive transition part 12 are arranged in an L-shaped bending structure.

[0061] In this embodiment, the core pack of the square battery is usually rectangular, and the terminal connection 10 and the conductive transition 12 are arranged in an L-shaped bending structure. The L-shaped bending structure allows the terminal connection 10 and the conductive transition 12 to be arranged reasonably along the edge of the core pack, making full use of the corner and edge space inside the battery, thereby reducing the space occupied by the battery pin structure 1 in the battery casing.

[0062] In some embodiments, reference Figure 4 , Figure 5 The electrode connection portion 11 includes a middle section 110 and a first side section 111 and a second side section 112 respectively connected to the middle section 110 along the third direction. The middle section 110 is connected to the conductive transition portion 12, and the third direction y intersects with the first direction x and the second direction z respectively.

[0063] In this embodiment, the first side segment 111 and the second side segment 112 are used for welding to the tab, increasing the welding area. When welding the tab, the first side segment 111 and the second side segment 112 are kept perpendicular to the middle segment 110. At this time, the first side segment 111 and the second side segment 112 are in an unfolded state, providing ample operating space for the welding operation and ensuring that the tab can be accurately welded to the first side segment 111 and the second side segment 112, establishing a reliable current transmission path. After welding is completed, before placing the tab connection 11 into the battery casing, the first side segment 111 and the second side segment 112 are overlapped onto the middle segment 110. This overlap operation changes the spatial shape of the tab connection 11, reducing its space occupation within the battery casing while ensuring current transmission functionality.

[0064] Secondly, embodiments of this application provide a battery cell including the battery pin structure 1 described above. It also includes the advantages of the battery pin structure 1 described above.

[0065] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0067] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0068] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery pin structure (1), characterized in that, include: The terminal connection part (10) is used for electrical connection with the terminal of the battery; The electrode connection part (11) is used for electrical connection with the electrode of the battery; A conductive transition portion (12) is connected between the pole post connection portion (10) and the tab connection portion (11) along a first direction (x); In this configuration, at least a portion of the conductive transition portion (12) is bent multiple times to form a multi-layered structure (120) in a second direction (z) perpendicular to the first direction (x).

2. The battery pin structure (1) according to claim 1, characterized in that, The stacked structure (120) is formed by bending at least a portion of the conductive transition portion (12) back and forth along a first direction (x).

3. The battery pin structure (1) according to claim 1, characterized in that, The conductive transition portion (12) is a strip structure having a first end (1201) and a second end (1202) disposed opposite to each other along the first direction (x); the first end (1201) is connected to the pole post connection portion (10), and the second end (1202) is connected to the tab connection portion (11).

4. The battery pin structure (1) according to claim 3, characterized in that, The first end (1201) and the second end (1202) are in the same plane in the second direction (z).

5. The battery pin structure (1) according to claim 4, characterized in that, The stacked structure (120) includes two bent units (121) arranged side by side and connected to each other along the first direction (x); and at least one of the bent units (121) is a multi-layered stacked structure; The end of the bending unit (121) near the pole post connection (10) constitutes the first end (1201), and the end of the bending unit (121) near the pole tab connection (11) constitutes the second end (1202).

6. The battery pin structure (1) according to claim 5, characterized in that, Both bending units (121) are multi-layered structures formed by reciprocating bending of part of the conductive transition portion (12) along the first direction (x).

7. The battery pin structure (1) according to claim 6, characterized in that, The two bending units (121) have opposite reciprocating bending directions along the first direction (x).

8. The battery pin structure (1) according to claim 6, characterized in that, Multi-point contact is formed between the two bending units (121).

9. The battery pin structure (1) according to claim 6, characterized in that, Meet at least one of the following: The bending unit (121) has no fewer than three layers; The two bending units (121) have the same number of stacked layers; The two bending units (121) have the same thickness in the second direction (z); The two bending units (121) have equal lengths in the first direction (x); The two bending units (121) have equal widths in a third direction (y), which intersects the first direction (x) and the second direction (z) respectively.

10. The battery pin structure (1) according to any one of claims 1 to 9, characterized in that, The layers of the stacked structure (120) are fixedly connected by high-temperature diffusion bonding or by filling with conductive adhesive.

11. The battery pin structure (1) according to any one of claims 1 to 9, characterized in that, Meet at least one of the following: The pole connecting part (10) and the conductive transition part (12) are arranged in an L-shaped bending structure; The tab connection portion (11) includes a middle section (110) and a first side section (111) and a second side section (112) respectively connected to the middle section (110) along the third direction (y). The middle section (110) is connected to the conductive transition portion (12), and the third direction (y) intersects the first direction (x) and the second direction (z) respectively.

12. A single battery cell, characterized in that, Includes the battery pin structure (1) as described in any one of claims 1 to 11.

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