A single battery and a battery pack

Abstract

This application provides a single-cell battery and a battery pack, belonging to the field of battery technology. The single-cell battery has intersecting first and second directions. The single-cell battery includes a casing, electrode assembly, lower plastic, end cap, terminal post, and connecting piece. The end cap is connected to the end of the casing along the first direction. The terminal post passes through the casing along the first direction. The electrode assembly is housed within the casing, and a tab is disposed at the end of the electrode assembly facing the end cap. The lower plastic is connected to the side of the end cap near the electrode assembly, and a protrusion is provided on the side of the lower plastic near the electrode assembly. The connecting piece is disposed between the end cap and the electrode assembly. The connecting piece includes a connected terminal post connecting piece and a tab connecting piece, which are spaced apart along the first direction. The terminal post connecting piece is connected to the terminal post, and a portion of the tab connecting piece is located in a first groove and connected to the tab. The single-cell battery provided by this application not only improves space utilization but also increases the energy density of the electrode assembly.

Description

Technical Field

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

[0002] With the booming development of new energy vehicles, the requirements for power batteries are also increasing. Higher energy density and higher space utilization have become important trends in the development of power batteries. To achieve higher space utilization within a limited space in order to increase energy density, it is necessary to improve the internal space utilization at the cell level.

[0003] However, since the height of a single battery cell (the height of a single battery cell is the distance between the bottom surface of the battery cell and the end face of the terminal post away from the cell assembly) is fixed, the part of the terminal post protruding from the cover plate will occupy the height of the battery cell, reducing the usable height space inside the casing, resulting in low space utilization inside the casing and affecting the energy density of the single battery cell. Utility Model Content

[0004] In view of this, the purpose of this application is to overcome the shortcomings of the prior art and provide a single cell battery and a battery pack.

[0005] This application provides the following technical solution: a single-cell battery, having a first orientation, comprising:

[0006] case;

[0007] An end cap is connected to the end of the housing along the first direction;

[0008] The pole post is inserted into the end cap along the first direction;

[0009] The electrode assembly is housed within the housing;

[0010] A tab is disposed at the end of the electrode assembly facing the end cap;

[0011] The lower plastic is connected to the end cap on the side near the electrode assembly. The lower plastic has a first groove on the side near the electrode assembly, and the first groove is recessed in the direction away from the electrode assembly.

[0012] A connecting piece is disposed between the end cap and the electrode assembly. The connecting piece includes a pole post connecting piece and a tab connecting piece that are connected to each other. The pole post connecting piece and the tab connecting piece are spaced apart along the first direction. The pole post connecting piece is electrically connected to the pole post. A portion of the tab connecting piece is located in the first groove and is electrically connected to the tab.

[0013] In some embodiments, the lower plastic has a protrusion, the protrusion being recessed in the direction away from the electrode assembly along the first direction to form the first groove, and the end cap having a second groove on the side facing the lower plastic, the protrusion being received in the second groove.

[0014] In some embodiments, the end cap has a third groove on the side opposite to the housing, and the third groove is recessed toward the electrode assembly;

[0015] The single cell also includes a first insulating member, a portion of which is located within the third groove. The electrode post has a riveting portion located on the side of the end cap away from the electrode assembly. A portion of the first insulating member is located between the riveting portion and the end cap.

[0016] In some embodiments, the single cell includes a boss disposed on the side of the end cap away from the electrode assembly, the boss corresponding to the second groove along the first direction, and the boss protruding in the direction away from the electrode assembly.

[0017] In some embodiments, the pole post includes a first pole post and a second pole post, and there are multiple protrusions disposed between the first pole post and the second pole post, with at least one protrusion adjacent to the first pole post and at least one protrusion adjacent to the second pole post.

[0018] In some embodiments, the single cell further has a second direction and a third direction that are perpendicular to each other in the first direction;

[0019] The bosses are multiple, and at least some of the bosses are arranged at intervals along the third direction, and / or at least some of the bosses are arranged at intervals along the second direction.

[0020] In some embodiments, adjacent bosses are arranged intersectingly.

[0021] In some embodiments, the plurality of protrusions are arranged symmetrically about the central axis of the end cap.

[0022] In some embodiments, the connecting piece further includes a connecting portion, through which the pole connecting piece and the tab connecting piece are connected;

[0023] Along the first direction, the distance from the side of the electrode tab facing the end cap to the end cap is less than the distance from the side of the electrode connecting piece facing the end cap to the end cap.

[0024] Secondly, this application provides a battery pack including the aforementioned single battery cell.

[0025] The embodiments of this application have the following advantages: The single cell provided by this application provides a first groove on the side of the lower plastic facing the electrode assembly, and a part of the electrode tab connecting piece is disposed in the first groove and connected to the electrode tab, so that the single cell can improve the space utilization rate inside the casing while keeping the length along the first direction unchanged, thereby improving the energy density of the electrode assembly.

[0026] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 An exploded view of a single-cell battery provided by some embodiments of this application is shown;

[0029] Figure 2 A cross-sectional view of the interior of a single cell provided by some embodiments of this application is shown;

[0030] Figure 3 It shows Figure 2 Enlarged view of section A in the middle;

[0031] Figure 4 This application provides a schematic diagram of the structure of a single-cell battery from another perspective, illustrating some embodiments thereof.

[0032] Figure 5 It shows Figure 4 Sectional view of section AA;

[0033] Figure 6 This paper shows a schematic diagram of the structure of a first embodiment of a single-cell battery provided by some embodiments of this application;

[0034] Figure 7 It shows Figure 6 Sectional view of the middle BB section;

[0035] Figure 8 It shows Figure 6 A sectional view of the central CC section;

[0036] Figure 9 This illustration shows a schematic structural diagram from one perspective of a second embodiment of a single-cell battery provided by some embodiments of this application;

[0037] Figure 10 It shows Figure 9 Sectional view of the middle DD section;

[0038] Figure 11 It shows Figure 9 Sectional view of the middle EE section;

[0039] Figure 12 This illustration shows a schematic structural diagram from one perspective of a third embodiment of a single-cell battery provided by some embodiments of this application;

[0040] Figure 13 It shows Figure 12 Sectional view of the middle FF section;

[0041] Figure 14 It shows Figure 12 A sectional view of the middle GG section;

[0042] Figure 15 A schematic diagram of a fourth embodiment of a single-cell battery provided by some embodiments of this application is shown from one perspective.

[0043] Figure 16 It shows Figure 15 A cross-sectional view of the middle HH section;

[0044] Figure 17 It shows Figure 15 Sectional view of section II.

[0045] Explanation of key component symbols:

[0046] 100-Housing; 200-Electrode assembly; 210-Electrode tab; 300-End cap; 310-Second groove; 400-Electrode post; 410-First electrode post; 420-Second electrode post; 430-Riveting part; 500-Connecting piece; 320-Third groove; 600-First insulating part; 510-Electrode post connecting piece; 520-Connecting part; 530-Electrode tab connecting piece; 700-Lower plastic; 710-Protrusion; 720-First groove; 330-Boss.

[0047] X - First direction; Y - Second direction; Z - Third direction. Detailed Implementation

[0048] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0049] It should be noted that when an element is said to be "fixed" to another element, it can be directly on the other element or there may be an intervening element. When an element is said to be "connected" to another element, it can be directly connected to the other element or there may be an intervening element. Conversely, when an element is said to be "directly" on another element, there is no intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0050] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0052] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the template description is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0053] like Figures 1 to 5 As shown, some embodiments of this application provide a single cell battery having a first direction X. The single cell battery is mainly used to provide a first groove 720 on the side of the lower plastic 700 facing the electrode assembly 200, and to place a part of the tab connecting piece 530 in the first groove 720 and connect it with the tab 210, so that the length of the electrode assembly 200 along the first direction X can be increased while the length of the single cell battery along the first direction X remains unchanged, thereby improving the energy density of the single cell battery.

[0054] The single cell includes a casing 100, an end cap 300, a terminal post 400, an electrode assembly 200, a lower plastic piece 700, and a connecting piece 500.

[0055] Wherein, the end cap 300 is connected to the end of the housing 100 along the first direction X, and the connection method between the end cap 300 and the housing 100 includes any one of bonding, welding, snap-fitting, and riveting.

[0056] By connecting the end cap 300 and the housing 100, the housing 100 is sealed on one side along the first direction X, and a sealed receiving space is formed by the end cap 300 and the inner wall of the housing 100.

[0057] The pole post 400 is inserted through the end cap 300 along the first direction X. In this embodiment, the pole post 400 penetrates the side of the end cap 300 away from the housing 100 along the first direction X, and a portion of the pole post 400 protrudes from the side of the end cap 300 away from the housing 100.

[0058] The electrode assembly 200 is housed within the housing 100, that is, the electrode assembly 200 is disposed in the housing space, and the housing 100 and the end cap 300 provide limiting and protection for the electrode assembly 200.

[0059] In this embodiment, the tabs 210 are disposed at the ends of the electrode assembly 200 facing the end cap 300. It should be noted that the ends of the end cap 300 refer to both ends of the end cap 300 along its length. That is, the electrode assembly 200 has two tabs 210 on the side facing the end cap 300, one tab 210 being close to one end of the end cap 300 along its length, and the other tab 210 being close to the other end of the end cap 300 along its length.

[0060] The lower plastic 700 is connected to the end cap 300 near the electrode assembly 200, thereby separating the end cap 300 and the electrode assembly 200 and limiting the electrode assembly 200. In this embodiment, the lower plastic 700 has a first groove 720 on the side near the electrode assembly 200. The opening of the first groove 720 faces the electrode assembly 200, and the first groove 720 is recessed in a direction away from the electrode assembly 200 to form a clearance space.

[0061] Additionally, a connecting piece 500 is disposed between the end cap 300 and the electrode assembly 200. The connecting piece 500 includes a connected terminal post connecting piece 510 and a tab connecting piece 530. The terminal post connecting piece 510 and the tab connecting piece 530 are spaced apart along the first direction X. The terminal post connecting piece 510 is electrically connected to the terminal post 400. A portion of the tab connecting piece 530 is located within the first groove 720 and is electrically connected to the tab 210, thereby forming an electrical connection between the tab 210 and the terminal post 400 through the connecting piece 500. By disposing the tab connecting piece 530 in the first groove 720, the length of the electrode assembly 200 along the first direction X can be increased while keeping the length of the single cell unchanged, thereby improving the energy density of the single cell.

[0062] like Figure 3 As shown, in some embodiments of this application, the lower plastic 700 has a protrusion 710, which is recessed in the direction away from the electrode assembly 200 along the first direction X to form a first groove 720. The end cap 300 has a second groove 310 on the side facing the lower plastic 700. The protrusion 710 is received in the second groove 310, so that the side of the protrusion 710 away from the electrode assembly 200 fits against the inner wall of the second groove 310. This not only improves the space utilization inside the housing 100, but also allows the first groove 720 to make way for the tabs 210 in the electrode assembly 200, thereby increasing the energy density of the electrode assembly 200 within the limited space inside the housing 100.

[0063] like Figure 2 As shown, in some embodiments of this application, the end cap 300 is provided with a third groove 320 on the side away from the housing 100, and the third groove 320 is recessed toward the electrode assembly 200.

[0064] The single cell also includes a first insulating member 600, a portion of which is located within the third groove 320. The sidewall of the first insulating member 600 is connected to the inner wall of the third groove 320 to provide a limiting effect on the first insulating member 600 through the inner wall of the third groove 320, thereby ensuring the stability of the first insulating member 600 in the third groove 320.

[0065] In addition, the pole post 400 has a riveting portion 430, which is located on the side of the end cap 300 away from the electrode assembly 200. A portion of the first insulating member 600 is located between the riveting portion 430 and the end cap 300, so that the first insulating member 600 is limited along the first direction X by the riveting portion 430 and the end cap 300. At the same time, the first insulating member 600 is limited along the direction perpendicular to the first direction X by the groove wall of the third groove 320, so as to further improve the stability of the first insulating member 600 in the third groove 320.

[0066] Meanwhile, the first insulating component 600 can insulate and separate the end cap 300 and the terminal post 400 to ensure the stability and safety of the single cell.

[0067] like Figures 6 to 17 As shown, in some embodiments of this application, a single cell includes a boss 330, which is disposed on the side of the end cover 300 away from the electrode assembly 200. The boss 330 corresponds to the second groove 310 along the first direction X, and the boss 330 protrudes in the direction away from the electrode assembly 200.

[0068] The shape of the boss 330 can be any one or a combination of two or more of the following: polygonal, circular, elliptical, or letter-shaped. In this embodiment, a rectangular boss 330 is preferred, as rectangles are easier to process.

[0069] In addition, the number of bosses 330 can be one, two or more, depending on the specific circumstances.

[0070] like Figure 6 and Figure 9 As shown, in some embodiments, the end cap 300 has a plurality of protrusions 330 on the side opposite to the electrode assembly 200, the plurality of protrusions 330 being spaced apart to enhance the strength of the end cap 300.

[0071] Since the first pole post 410 and the second pole post 420 penetrate the end cap 300 along the first direction X, the strength of the end cap 300 in the region corresponding to the first pole post 410 and the second pole post 420 is reduced.

[0072] Based on this, such as Figure 6 , Figure 9 , Figure 12 and Figure 15 As shown, in some embodiments of this application, the pole post 400 includes a first pole post 410 and a second pole post 420, the first pole post 410 and the second pole post 420 are spaced apart, and there are multiple protrusions 330, which are disposed between the first pole post 410 and the second pole post 420. At least one protrusion 330 is adjacent to the first pole post 410 and at least one protrusion 330 is adjacent to the second pole post 420.

[0073] It should be noted that "adjacent" as used here means that the boss 330 is close to the first pole post 410, and there is a gap between the boss 330 and the first pole post 410.

[0074] It is understood that in some embodiments, when only one boss 330 is provided, the boss 330 can be provided adjacent to the first pole post 410 or adjacent to the second pole post 420; in this embodiment, in order to balance the strength, at least one boss 330 among the multiple bosses 330 is provided adjacent to the first pole post 410, and at least one boss 330 is provided adjacent to the second pole post 420.

[0075] By attaching the boss 330 to the first terminal 410 and the second terminal 420, the strength of the end cap 300 near the first terminal 410 and the second terminal 420 is increased by the boss 330, thereby increasing the strength of the single cell.

[0076] Specifically, the protrusion 330 increases the thickness of the end cap 300 around the first pole post 410 and the second pole post 420, and disperses the stress originally concentrated near the first pole post 410 and the second pole post 420. The protrusion 330 can also transmit the load more smoothly, reduce the peak stress, and thus improve the overall strength and durability of the end cap 300.

[0077] like Figure 2 As shown, in some embodiments of this application, the single cell also has a second direction Y and a third direction Z that are perpendicular to the first direction X.

[0078] In this embodiment, there are multiple bosses 330, at least some of which are arranged at intervals along the third direction Z, and / or at least some of which are arranged at intervals along the second direction Y.

[0079] like Figure 6 and Figure 9 As shown, in some embodiments, at least some of the bosses 330 are spaced apart along a third direction Z, or at least some of the bosses 330 are spaced apart along a second direction Y.

[0080] In other embodiments, at least some of the bosses 330 are spaced apart along a third direction Z, and at least some of the bosses 330 are spaced apart along a second direction Y.

[0081] By increasing the number of protrusions 330 around the first pole post 410, the load received around the first pole post 410 can be further distributed to multiple local areas. Each protrusion 330 can bear a portion of the stress, making the stress distribution of the end cap 300 around the first pole post 410 more uniform, and forming a multi-point support structure around the first pole post 410. Furthermore, by increasing the number of protrusions 330 around the second pole post 420, the load received around the second pole post 420 can be further distributed to multiple local areas. Each protrusion 330 can bear a portion of the stress, making the stress distribution of the end cap 300 around the second pole post 420 more uniform, and forming a multi-point support structure around the second pole post 420, thereby effectively resisting bending or torsional deformation.

[0082] like Figure 15 As shown, in some embodiments of this application, adjacent bosses 330 are arranged intersectingly. Specifically, the bosses 330 near the first pole post 410 are arranged intersectingly, and the bosses 330 near the second pole post 420 are arranged intersectingly.

[0083] For example, there are two protrusions 330 near the first pole post 410, which are intersecting each other, and the included angle between the two protrusions 330 can be a right angle or an acute angle; in addition, there are two protrusions 330 near the second pole post 420, and the included angle between the two protrusions 330 can be a right angle or an acute angle.

[0084] It should be noted that by providing intersecting bosses 330 on the side of the end cap 300 near the first pole post 410, a frame support structure is formed around the first pole post 410. This allows the bosses 330 to distribute the load more evenly in the area of ​​the end cap 300 near the first pole post 410, preventing a single boss 330 from failing due to excessive force. At the same time, the intersecting bosses 330 can provide load transfer paths in multiple directions, thereby further improving the strength of the end cap 300 near the first pole post 410.

[0085] In addition, by providing intersecting bosses 330 on the side of the end cap 300 near the second pole post 420, a supporting frame structure is formed around the second pole post 420. This allows the bosses 330 to distribute the load more evenly in the area of ​​the end cap 300 near the second pole post 420, preventing a single boss 330 from failing due to excessive force. At the same time, the intersecting bosses 330 can provide load transfer paths in multiple directions, thereby further improving the strength of the end cap 300 near the second pole post 420.

[0086] like Figure 6 , Figure 9 , Figure 12 and Figure 15As shown, in some embodiments of this application, multiple bosses 330 are symmetrically arranged around the central axis of the end cap 300 to improve the strength uniformity of the end cap 300 around the first pole post 410 and the second pole post 420, thereby improving the overall strength uniformity of the end cap 300.

[0087] In this embodiment, the number of protrusions 330 near the first pole post 410 is equal to the number of protrusions 330 near the second pole post 420.

[0088] like Figure 1 and Figure 3 As shown, in some embodiments of this application, the connecting piece 500 further includes a connecting portion 520, and the pole connecting piece 510 and the pole tab connecting piece 530 are connected through the connecting portion 520.

[0089] In this embodiment, the pole connecting piece 510, the tab connecting piece 530, and the connecting part 520 are integrally connected to form the connecting piece 500, so as to improve the stability and strength of the connecting piece 500 and ensure the stability of the connection between the pole 400 and the tab 210 through the connecting piece 500.

[0090] Along the first direction X, the distance from the side of the tab 210 facing the end cap 300 to the end cap 300 is less than the distance from the side of the pole connecting piece 510 facing the end cap 300 to the end cap 300. It can be understood that by setting the connecting piece 500 with a "Z" shaped structure, not only can the tab 210 and the pole 400 be connected, but the tab connecting piece 530 can also be accommodated in the first groove 720, thereby reducing the total thickness between the tab connecting piece 530 and the end cap 300. By connecting the tab 210 along the first direction X with the tab connecting piece 530, the length of the electrode assembly 200 in the first direction X is increased, thereby improving the energy density of the electrode assembly 200.

[0091] This application provides a battery pack including the single battery cells described in any of the above embodiments.

[0092] It should be noted that the battery pack provided in this application has the structure of the single cell described in any of the above embodiments and the beneficial effects thereof, which will not be repeated here.

[0093] In all examples shown and described herein, any specific values ​​should be interpreted as merely exemplary and not as limitations; therefore, other examples of exemplary embodiments may have different values.

[0094] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0095] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these modifications and improvements all fall within the protection scope of this application.

Claims

1. A single-cell battery having a first orientation (X), characterized in that, include: Casing (100); An end cap (300) is connected to the end of the housing (100) along the first direction (X); The pole post (400) is inserted into the end cap (300) along the first direction (X); The electrode assembly (200) is housed within the housing (100); A tab (210) is disposed at the end of the electrode assembly (200) facing the end cap (300); The lower plastic (700) is connected to the end cap (300) on the side near the electrode assembly (200). The lower plastic (700) on the side near the electrode assembly (200) is provided with a first groove (720), which is recessed in the direction away from the electrode assembly (200). A connecting piece (500) is disposed between the end cap (300) and the electrode assembly (200). The connecting piece (500) includes a pole post connecting piece (510) and a tab connecting piece (530) connected to each other. The pole post connecting piece (510) and the tab connecting piece (530) are spaced apart along the first direction (X). The pole post connecting piece (510) is electrically connected to the pole post (400). A portion of the tab connecting piece (530) is located in the first groove (720) and is electrically connected to the tab (210).

2. The single-cell battery according to claim 1, characterized in that, The lower plastic (700) has a protrusion (710), which is recessed in the first direction (X) away from the electrode assembly (200) to form a first groove (720). The end cap (300) has a second groove (310) on the side facing the lower plastic (700), and the protrusion (710) is received in the second groove (310).

3. The single-cell battery according to claim 2, characterized in that, The end cap (300) has a third groove (320) on the side opposite to the housing (100), and the third groove (320) is recessed along the first direction (X) toward the electrode assembly (200); The single cell also includes a first insulating member (600), a portion of which is located in the third groove (320). The electrode post (400) has a riveting portion (430) located on the side of the end cap (300) away from the electrode assembly (200). A portion of the first insulating member (600) is located between the riveting portion (430) and the end cap (300).

4. The single-cell battery according to claim 2, characterized in that, The single cell includes a boss (330) disposed on the side of the end cap (300) away from the electrode assembly (200). The boss (330) corresponds to the second groove (310) along the first direction (X). The boss (330) protrudes in the direction away from the electrode assembly (200).

5. The single-cell battery according to claim 4, characterized in that, The pole post (400) includes a first pole post (410) and a second pole post (420). There are multiple protrusions (330), and multiple protrusions (330) are disposed between the first pole post (410) and the second pole post (420). At least one protrusion (330) is adjacent to the first pole post (410), and at least one protrusion (330) is adjacent to the second pole post (420).

6. The single-cell battery according to claim 4, characterized in that, The single cell also has a second direction (Y) and a third direction (Z) that are perpendicular to the first direction (X) in pairs. There are multiple bosses (330), at least some of which are spaced apart along the third direction (Z), and / or at least some of which are spaced apart along the second direction (Y).

7. The single-cell battery according to claim 6, characterized in that, The adjacent bosses (330) are arranged intersectingly.

8. The single-cell battery according to claim 6, characterized in that, The plurality of said bosses (330) are arranged symmetrically about the central axis of said end cap (300).

9. The single-cell battery according to any one of claims 1 to 8, characterized in that, The connecting piece (500) further includes a connecting part (520), through which the pole connecting piece (510) and the pole tab connecting piece (530) are connected; Along the first direction (X), the distance from the side of the tab (210) facing the end cap (300) to the end cap (300) is less than the distance from the side of the pole connecting piece (510) facing the end cap (300) to the end cap (300).

10. A battery pack, characterized in that, Includes the single-cell battery as described in any one of claims 1 to 9.

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