Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises a pole structure, the battery shell is provided with a pole column through hole, at least part of the pole column structure is arranged in the pole column through hole in a penetrating manner, the battery shell is provided with a limiting part, and the limiting part is arranged around the pole column through hole so as to limit the pole column structure to be separated from the pole column through hole; wherein the side, close to the battery shell, of the limiting part is connected with the battery shell through a circular arc, and the ratio of the radius of the circular arc to the maximum wall thickness of the side, provided with the pole through hole, of the battery shell is 0.2-0.8, so that the connection stability between the limiting part and the battery shell can be ensured, and the risk of cracking at the connection position of the battery shell and the limiting part is avoided; therefore, reliable fixation of the pole structure formed by the limiting part and the battery shell can be ensured, and the safe use performance of the battery is further improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery. Background Art

[0002] In the related art, a pole structure may be fixedly provided on a battery casing. During the use of the battery, whether it is the gas generated inside the battery or the vibration occurring during the use, it may affect the pole structure and the battery casing. Due to the structural limitations of the pole structure and the battery casing, the pole structure may have insufficient stability, which may also affect the structural strength of the battery casing. Utility Model Content

[0003] The utility model provides a battery to improve the use performance of the battery.

[0004] The utility model provides a battery, comprising:

[0005] Pole structure;

[0006] A battery housing, wherein a pole through hole is provided on the battery housing, at least a portion of the pole structure is inserted into the pole through hole, and a limiting portion is provided on the battery housing, the limiting portion is arranged around the pole through hole to limit the pole structure from being separated from the pole through hole;

[0007] The limiting part is connected to the battery shell through an arc on one side close to the battery shell, and the ratio of the radius of the arc to the maximum wall thickness of the battery shell on the side where the pole through hole is provided is 0.2-0.8.

[0008] The battery of the utility model embodiment includes a pole structure and a battery shell, and the pole structure is arranged on the battery shell. By arranging a limiting portion on the battery shell, the limiting portion is arranged around the pole through hole, thereby facilitating the fixing of the pole structure by the limiting portion. The limiting portion is connected to the battery shell through an arc near the side of the battery shell, and the ratio of the radius of the arc to the maximum wall thickness of the side of the battery shell where the pole through hole is arranged is 0.2-0.8, thereby ensuring the connection stability between the limiting portion and the battery shell, avoiding the risk of cracking at the connection position between the battery shell and the limiting portion, thereby ensuring that the limiting portion and the battery shell form a reliable fixation of the pole structure, thereby improving the safe use performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0010] Figure 1 is a schematic structural diagram of a battery according to an exemplary embodiment;

[0011] Figure 2 is a schematic diagram of a partial cross-sectional structure of a battery according to an exemplary embodiment.

[0012] The following are the descriptions of the reference numerals:

[0013] 10. Pole structure; 20. Battery shell; 21. Pole through hole; 22. Positioning portion; 221. Fixing section; 222. Pressing section; 23. Cover plate; 24. Shell member; 25. Groove; 26. Circular arc. DETAILED DESCRIPTION

[0014] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0015] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0016] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0017] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0018] An embodiment of the present utility model provides a battery, please refer to Figure 1 and Figure 2 The battery comprises: a pole structure 10; a battery shell 20, wherein the battery shell 20 is provided with a pole through hole 21, wherein at least a portion of the pole structure 10 is passed through the pole through hole 21, and a limiting portion 22 is provided on the battery shell 20, wherein the limiting portion 22 is arranged around the pole through hole 21; wherein the limiting portion 22 is connected to the battery shell 20 through an arc 26 on one side close to the battery shell 20, and the ratio of the radius of the arc 26 to the maximum wall thickness on the side of the battery shell 20 provided with the pole through hole 21 is 0.2-0.8.

[0019] A battery of one embodiment of the utility model includes a pole structure 10 and a battery shell 20, wherein the pole structure 10 is arranged on the battery shell 20, and a limiting portion 22 is arranged on the battery shell 20, and the limiting portion 22 is arranged around the pole through hole 21, thereby facilitating the fixing of the pole structure 10 by the limiting portion 22. The limiting portion 22 is connected to the battery shell 20 by an arc 26 near the side of the battery shell 20, and the ratio of the radius of the arc 26 to the maximum wall thickness of the side of the battery shell 20 provided with the pole through hole 21 is 0.2-0.8, thereby ensuring the connection stability between the limiting portion 22 and the battery shell 20, avoiding the risk of cracking at the connection position of the battery shell 20 and the limiting portion 22, thereby ensuring that the limiting portion 22 and the battery shell 20 form a reliable fixation of the pole structure 10, thereby improving the safe use performance of the battery.

[0020] It should be noted that, combined with Figure 1 As shown, the battery includes a pole structure 10 and a battery housing 20 . The pole structure 10 is disposed on the battery housing 20 . There may be two pole structures 10 , and the two pole structures 10 are disposed on the battery housing 20 at intervals.

[0021] Combination Figure 2As shown, the battery housing 20 is provided with a pole through hole 21, and the pole structure 10 is inserted into the pole through hole 21, thereby the pole structure 10 is set on the battery housing 20, and the pole structure 10 and the battery housing 20 can be insulated. For example, the pole structure 10 and the battery housing 20 can be insulated by an insulating structure, or the pole structure 10 and the battery housing 20 can be insulated by an insulating coating. The pole structure 10 is inserted into the pole through hole 21, that is, the pole structure 10 can pass through the pole through hole 21, or the pole structure 10 may not pass through the pole through hole 21, which is not limited here, but only indicates that at least part of the pole structure 10 can be located in the pole through hole 21.

[0022] Combination Figure 2 As shown, a limiting portion 22 is provided on the battery housing 20, and the limiting portion 22 can be welded and fixed on the battery housing 20, or the limiting portion 22 can be integrally formed on the battery housing 20. The limiting portion 22 is arranged around the pole through hole 21, thereby facilitating the fixing of the pole structure 10 by the limiting portion 22, thereby improving the assembly efficiency of the battery.

[0023] Combination Figure 2 As shown, the limiting portion 22 is connected to the battery shell 20 through an arc 26 on one side close to the battery shell 20, and the ratio of the radius of the arc 26 to the maximum wall thickness of the battery shell 20 on the side where the pole through hole 21 is provided is 0.2-0.8, which can not only avoid the risk of cracking at the connection position between the battery shell 20 and the limiting portion 22, but also avoid the wall thickness of the battery shell 20 being too large, which affects the energy density of the battery.

[0024] The ratio of the radius of the arc 26 to the maximum wall thickness of the battery housing 20 can be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75 or 0.8, etc.

[0025] The battery casing 20 and the limiting portion 22 can be an integrally formed structure. The wall thickness of the battery casing 20 will affect the size of the arc 26 during processing and forming. The thicker the wall thickness of the battery casing 20, the larger the arc 26 can be. However, the wall thickness of the battery casing 20 cannot be too thick, otherwise there will be problems of excessive weight and large space occupation. The thinner the wall thickness of the battery casing 20, the smaller the arc 26, which can easily cause cracks at the connection position between the battery casing 20 and the limiting portion 22.

[0026] The maximum wall thickness of the battery casing 20 on the side where the pole through hole 21 is provided can be considered as the maximum wall thickness of the battery casing 20 on the side where the pole structure 10 is provided. For example, the battery casing 20 includes a cover plate 23 and a shell member 24, and the cover plate 23 is provided with the pole structure 10. At this time, the maximum wall thickness of the battery casing 20 on the side where the pole through hole 21 is provided is the maximum wall thickness of the cover plate 23. Alternatively, the shell member 24 is provided with the pole structure 10, and the side of the shell member 24 opposite to the cover plate 23 can be provided with the pole structure 10. At this time, the maximum wall thickness of the battery casing 20 on the side where the pole through hole 21 is provided is the maximum wall thickness of the side of the shell member 24 opposite to the cover plate 23.

[0027] In one embodiment, the limiting portion 22 is bent into a fixed section 221 and a pressing section 222, the fixed section 221 is arranged on the battery housing 20, and the pressing section 222 is pressed on the pole structure 10, so that the pole structure 10 is clamped between the pressing section 222 and the battery housing 20, thereby ensuring the connection stability of the pole structure 10 and preventing the pole structure 10 from detaching from the battery housing 20.

[0028] The limiting portion 22 can be bent into a fixed section 221 and a pressing section 222, so that the pressing section 222 can be pressed onto the pole structure 10, and the pole structure 10 is clamped between the pressing section 222 and the battery casing 20. At this time, a certain angle is formed between the fixed section 221 and the pressing section 222, so that the fixed section 221 can be set on the battery casing 20, and the pressing section 222 can be pressed onto the pole structure 10, thereby effectively preventing the pole structure 10 from detaching from the battery casing 20, thereby ensuring the safe use performance of the battery.

[0029] The outer surface of the fixing section 221 is connected to the outer surface of the battery housing 20 via the arc 26 , which can be considered as a transition of the arc 26 between the outer surface of the fixing section 221 and the outer surface of the battery housing 20 .

[0030] In one embodiment, the radius of the arc 26 is 0.5mm-1.5mm, which can facilitate the molding of the battery housing 20 and the limiting portion 22, and the presence of the arc 26 can reduce stress concentration, thereby reducing the risk of breakage of the limiting portion 22, thereby ensuring that the limiting portion 22 can reliably fix the pole structure 10, thereby improving the safe use performance of the battery.

[0031] The limiting portion 22 is connected to the battery shell 20 through an arc 26 on one side close to the battery shell 20. It can be considered that the cutting is performed along the direction of the central axis of the pole through hole 21. At this time, there will be an arc transition between the outer surface of the limiting portion 22 and the outer surface of the battery shell 20, and the radius of the arc is 0.5mm-1.5mm.

[0032] The radius of the arc 26 may be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm or 1.5 mm, etc.

[0033] In one embodiment, the battery housing 20 and the limiting portion 22 are an integrally formed structure, which can not only improve the manufacturing efficiency of the battery, but also ensure the structural strength of the battery housing 20 and the limiting portion 22. The battery housing 20 and the limiting portion 22 can be formed by extrusion, for example, the battery housing 20 can include a cover plate 23 and a shell member 24, and the limiting portion 22 is formed on the cover plate 23.

[0034] The battery housing 20 and the limiting portion 22 are an integrally formed structure, and the limiting portion 22 is integrally formed on the cover plate 23. The cover plate 23 and the limiting portion 22 can be formed by rolling a plate-like material. In this process, the larger the radius of the arc 26 between the outer surface of the fixed section 221 and the outer surface of the battery housing 20, the more material there is at the connection position between the cover plate 23 and the limiting portion 22, the higher the strength, and the less likely it is to crack. However, if the radius of the arc 26 is too large, the less material there is at the limiting portion 22, the thinner the limiting portion 22 is, and the lower the strength is, there may be a risk of cracking of the limiting portion 22, thereby affecting the fixation of the pole structure 10. If the radius of the arc 26 between the outer surface of the fixed section 221 and the outer surface of the battery housing 20 is too small, the strength at the connection position between the cover plate 23 and the limiting portion 22 will be low, thereby causing the risk of cracking.

[0035] In one embodiment, Figure 1 and Figure 2 As shown, the battery housing 20 includes a cover plate 23 and a shell member 24, the cover plate 23 and the shell member 24 are connected, and a limiting portion 22 is arranged on the cover plate 23; wherein, the ratio of the radius of the arc 26 to the maximum thickness of the cover plate 23 is 0.2-0.8, so that after the cover plate 23 and the limiting portion 22 are formed, the structural strength of the cover plate 23 and the limiting portion 22 can be ensured, and the risk of the cover plate 23 and the limiting portion 22 being broken can be reduced, and the space occupancy rate of the cover plate 23 and the limiting portion 22 can also be effectively controlled, thereby controlling the energy density of the battery.

[0036] In one embodiment, the ratio of the radius of the arc 26 to the maximum thickness of the cover plate 23 is 0.3-0.6, thereby ensuring the energy density of the battery, and ensuring the safety performance of the cover plate 23 and the limit portion 22, thereby improving the safe use performance of the battery.

[0037] The ratio of the radius of the arc 26 to the maximum thickness of the cover plate 23 may be 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75 or 0.8, etc.

[0038] In one embodiment, the thickness of the cover plate 23 is 1 mm-5 mm, which can not only ensure the structural strength of the cover plate 23, but also avoid the problem of excessive weight of the battery housing 20 caused by excessive thickness of the cover plate 23.

[0039] The thickness of the cover plate 23 may be 1 mm, 1.2 mm, 1.4 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.4 mm, 2.5 mm, 2.8 mm, 3 mm, 3.2 mm, 3.4 mm, 3.5 mm, 3.8 mm, 4 mm, 4.2 mm, 4.4 mm, 4.5 mm, 4.8 mm or 5 mm, etc.

[0040] It should be noted that, in some embodiments, the battery housing 20 includes a cover plate 23 and a shell member 24, the cover plate 23 and the shell member 24 are connected, and a limiting portion 22 is provided on the shell member 24. For example, a limiting portion 22 can be provided on the portion of the shell member 24 opposite to the cover plate 23.

[0041] In one embodiment, a groove 25 is provided on the inner surface of the battery housing 20, and the groove 25 is connected to the pole through hole 21; wherein, the ratio of the radius of the arc 26 to the depth of the groove 25 is 0.5-1.5, thereby effectively controlling the structural strength of the battery housing 20 for supporting the pole structure 10, achieving reliable support for the pole structure 10, and also ensuring the structural strength of the connection position between the battery housing 20 and the limiting portion 22.

[0042] A battery cell may be disposed in the battery casing 20 , and the inner surface of the battery casing 20 is the surface of the battery casing 20 facing the battery cell.

[0043] The battery housing 20 and the limiting portion 22 are an integrally formed structure. The structure of the battery housing 20 used to support the pole structure 10 is the bearing portion, and the bearing portion is extruded by the limiting portion 22 and the groove 25. The shallower the groove 25, the thicker the bearing portion, and the structural strength at the connection position between the battery housing 20 and the limiting portion 22 can be relatively large, which can reduce the risk of cracking. If the depth of the groove 25 is too large, the bearing portion will be too thin, and the strength of the bearing portion cannot be guaranteed.

[0044] The ratio of the radius of the arc 26 to the depth of the groove 25 can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45 or 1.5, etc.

[0045] In one embodiment, the limiting portion 22 is bent into a fixed section 221 and a pressing section 222. The fixed section 221 is arranged on the battery housing 20, and the pressing section 222 is pressed on the pole structure 10, so that the pole structure 10 is clamped between the pressing section 222 and the battery housing 20. Along the direction of the center line of the pole through hole 21, the pressing section 222 and the groove 25 are overlapped in their orthographic projection on the same surface, thereby ensuring that the pressing section 222 and the part of the battery housing 20 having the groove 25 can form an effective fixation for the pole structure 10, thereby improving the safe use performance of the battery.

[0046] The center line of the pole through hole 21 can be considered as the extension direction of the pole through hole 21, and further can be considered as the penetration direction through the battery housing 20. For example, the pole through hole 21 can be a circular hole, and the circular hole can have a center line.

[0047] In one embodiment, the ratio of the radius of the arc 26 to the maximum thickness of the limiting portion 22 is 0.5-2, so that the structural strength of the connection position between the battery housing 20 and the limiting portion 22 can be effectively guaranteed, and the structural strength of the limiting portion 22 can also be effectively controlled, thereby improving the safe use performance of the battery.

[0048] The ratio of the radius of the arc 26 to the maximum thickness of the limiting portion 22 can be 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1, 1.05, 1.1, 1.15, 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, 1.6, 1.65, 1.7, 1.75, 1.8, 1.85, 1.9, 1.95 or 2, etc.

[0049] It should be noted that the battery includes a cell and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, the stacked portion including a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0050] The battery cell can be electrically connected to the pole structure 10 , and the pole tab of the battery cell can be electrically connected to the pole structure 10 through an adapter.

[0051] In one embodiment, the battery may be a quadrangular prism battery. A quadrangular prism battery mainly refers to a battery having a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions.

[0052] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

[0053] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0054] In one embodiment, the battery may be a cylindrical battery, or the battery may be a hexagonal prism battery. The battery may be a wound battery, that is, a first pole piece, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

[0055] An embodiment of the utility model further provides a battery pack, which includes batteries.

[0056] The battery of the battery pack of one embodiment of the utility model comprises a pole structure 10 and a battery shell 20, wherein the pole structure 10 is arranged on the battery shell 20, and a limiting portion 22 is arranged on the battery shell 20, and the limiting portion 22 is arranged around the pole through hole 21, thereby facilitating the fixing of the pole structure 10 by the limiting portion 22. The limiting portion 22 is connected to the battery shell 20 by an arc 26 on the side close to the battery shell 20, and the ratio of the radius of the arc 26 to the maximum wall thickness of the side of the battery shell 20 provided with the pole through hole 21 is 0.2-0.8, thereby ensuring the connection stability between the limiting portion 22 and the battery shell 20, avoiding the risk of cracking at the connection position between the battery shell 20 and the limiting portion 22, thereby ensuring that the limiting portion 22 and the battery shell 20 form a reliable fixation of the pole structure 10, thereby improving the safe use performance of the battery.

[0057] In one embodiment, the battery pack is a battery module or a battery pack.

[0058] The battery module includes a plurality of batteries, and the battery module may further include an end plate and a side plate, and the end plate and the side plate are used to fix the plurality of batteries.

[0059] It should be noted that multiple batteries can be arranged in a battery box after forming a battery module, and multiple batteries can be fixed by end plates and side plates. Multiple batteries can be directly arranged in the battery box, that is, there is no need to group multiple batteries, in which case the end plates and side plates can be removed.

[0060] Those skilled in the art will readily come up with other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. The present disclosure is intended to cover any variation, use or adaptation of the present utility model, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and example embodiments are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0061] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from its scope. The scope of protection of the present disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that: include: Pole structure (10); A battery housing (20), wherein a pole through hole (21) is provided on the battery housing (20), at least a portion of the pole structure (10) is inserted into the pole through hole (21), and a limiting portion (22) is provided on the battery housing (20), wherein the limiting portion (22) is arranged around the pole through hole (21) to limit the pole structure (10) from being separated from the pole through hole (21); The limiting portion (22) is connected to the battery housing (20) via a circular arc (26) on a side close to the battery housing (20), and the ratio of the radius of the circular arc (26) to the maximum wall thickness of the battery housing (20) on a side where the terminal through hole (21) is provided is 0.2-0.

8.

2. The battery according to claim 1, characterized in that The radius of the arc (26) is 0.5 mm-1.5 mm.

3. The battery according to claim 1, characterized in that The battery housing (20) comprises a cover plate (23) and a shell member (24), the cover plate (23) and the shell member (24) are connected, and the limit portion (22) is provided on the cover plate (23); Wherein, the ratio of the radius of the arc (26) to the maximum thickness of the cover plate (23) is 0.2-0.

8.

4. The battery according to claim 3, characterized in that The ratio of the radius of the circular arc (26) to the maximum thickness of the cover plate (23) is 0.3-0.

6.

5. The battery according to claim 3, characterized in that The thickness of the cover plate (23) is 1 mm to 5 mm.

6. The battery according to claim 1, characterized in that A groove (25) is provided on the inner surface of the battery housing (20), and the groove (25) is connected to the terminal through hole (21); Wherein, the ratio of the radius of the arc (26) to the depth of the groove (25) is 0.5-1.

5.

7. The battery according to claim 6, characterized in that The limiting portion (22) is bent into a fixed section (221) and a pressing section (222); the fixed section (221) is arranged on the battery housing (20); the pressing section (222) is pressed on the pole structure (10), so that the pole structure (10) is clamped between the pressing section (222) and the battery housing (20); along the direction of the center line of the pole through hole (21), the pressing section (222) and the groove (25) are overlapped in their orthographic projections on the same surface.

8. The battery according to any one of claims 1 to 6, characterized in that The limiting portion (22) is bent into a fixed section (221) and a pressing section (222); the fixed section (221) is arranged on the battery housing (20); the pressing section (222) is pressed on the pole structure (10) so that the pole structure (10) is clamped between the pressing section (222) and the battery housing (20); and the outer surface of the fixed section (221) is connected to the outer surface of the battery housing (20) via the circular arc (26).

9. The battery according to any one of claims 1 to 7, characterized in that The ratio of the radius of the circular arc (26) to the maximum thickness of the limiting portion (22) is 0.5-2.

10. The battery according to any one of claims 1 to 7, characterized in that The battery housing (20) and the limiting portion (22) are an integrally formed structure.

11. The battery according to any one of claims 1 to 7, characterized in that The battery is a quadrangular prism battery.

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