Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises a battery cell, the pole assembly is electrically connected with the battery cell, a groove is formed in the side, away from the battery cell, of the first part, the second part is arranged in the groove, the maximum thickness of the second part is D, the groove is provided with an open end face, and the maximum size formed by the two opposite ends of the end face, away from the battery cell, of the second part is L, the distance between the outer edge of the end face, deviating from the battery cell, of the second part and the circumferential outermost end of the first part is d; the battery shell and the battery cell are arranged in the battery shell, the pole assembly is arranged in the pole through hole in a penetrating manner, a fixing part is arranged on the battery shell, the fixing part is bent into a connecting section and a pressing section, so that the pole assembly is clamped between the pressing section and the battery shell, and D * d / L2 is more than or equal to 0.00002 and less than or equal to 1, so that the overall overcurrent capacity of the pole assembly can be effectively controlled; and the risk of fixing failure of the fixing part is reduced, so that the safe use performance of the battery is reliably 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 assembly may be provided on the battery housing, thereby forming an electrical connection between the battery cell and the pole assembly. However, due to the structural limitations of the pole assembly, the cost of the pole assembly may be high, or the installation stability of the pole assembly may be affected, which is not conducive to ensuring the safe use performance of the battery. 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] Battery cells;

[0006] A battery housing, wherein the battery cell is arranged in the battery housing, a pole through hole is arranged on the battery housing, a fixing portion is arranged on the battery housing, the fixing portion is bent into a connecting section and a pressing section, and the connecting section is arranged on the battery housing;

[0007] A pole assembly, at least part of which is inserted into the pole through hole, a pressing section is pressed on the pole assembly so that at least part of the pole assembly is clamped between the pressing section and the battery shell, the pole assembly is electrically connected to the battery cell, the pole assembly includes a first part and a second part, a groove is provided on the side of the first part away from the battery cell, at least part of the second part is provided in the groove, the maximum thickness of the second part along a direction perpendicular to the surface of the battery shell where the pole assembly is provided is D, the groove has an open end face, the maximum size formed by the opposite ends of the end face of the second part away from the battery cell is L, the distance between the outer edge of the end face of the second part away from the battery cell and the circumferential outermost end of the first part is d, 0.00002≤D×d / L 2 ≤1.

[0008] The battery of the utility model embodiment includes a battery cell, a pole assembly and a battery case. The battery cell is arranged in the battery case, the pole assembly is arranged on the battery case, and the pole assembly is electrically connected to the battery cell. A groove is arranged on the side of the first part of the pole assembly away from the battery cell, and the second part of the pole assembly is arranged in the groove. On the basis of ensuring the current carrying capacity of the pole assembly, the overall weight of the pole assembly can also be adjusted, thereby controlling the manufacturing cost of the pole assembly. The fixed portion on the battery case is bent into a connecting section and a pressing section, so as to form a fixed limit for the pole assembly passing through the pole through hole, reduce the risk of the pole assembly detaching from the battery case, and improve the safe use performance of the battery. The maximum thickness of the second part is D, the maximum size formed by the two opposite ends of the end face of the second part away from the battery cell is L, the distance between the outer edge of the end face of the second part away from the battery cell and the circumferential outermost end of the first part is d, 0.00002≤D×d / L 2 ≤1, a groove is set at the top of the pole assembly, the deformation of the pole assembly is weak, and the fixing part is set by the battery shell to improve the overall connection strength between the two. The above setting avoids D×d / L 2 The value of is too small, resulting in the force on the top of the pole assembly being quickly transferred to the fixing part, that is, D×d is too small, the second part is weak in strength, and the risk of battery shell deformation is greater, which reduces the connection strength of the fixing part to the pole assembly, affects the structural stability between the pole assembly and the battery shell, and there is a risk of easy overlap between the two during deformation, causing the safety risk of battery short circuit; D×d / L 2 If the value of is too large, the flow area of ​​the second part of the pole assembly is narrow, and the overall thickness of the pole assembly is large, which may cause gas generation inside the battery or deformation of the internal structure of the battery, resulting in a greater risk of deformation of the fixed part of the battery shell. By adjusting the above ratio, not only can the flow capacity of the pole assembly as a whole be effectively controlled, but also the risk of fixed failure of the fixed part can be reduced, thereby reliably 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 structure of a battery according to an exemplary embodiment;

[0012] Figure 3 is a schematic diagram of a partial exploded structure of a battery according to an exemplary embodiment;

[0013] Figure 4 is a schematic diagram of a partial exploded structure of a battery according to another exemplary embodiment;

[0014] Figure 5 is a schematic diagram of a partial cross-sectional structure of a battery according to a first exemplary embodiment;

[0015] Figure 6 is a schematic diagram of a partial cross-sectional structure of a battery according to a second exemplary embodiment;

[0016] Figure 7 is a schematic diagram of a partial cross-sectional structure of a battery according to a third exemplary embodiment;

[0017] Figure 8 is a schematic diagram of a partial cross-sectional structure of a battery according to a fourth exemplary embodiment;

[0018] Fig. 9 is a schematic diagram of a partial cross-sectional exploded structure of a battery according to an exemplary embodiment;

[0019] Fig.10 is a schematic diagram of a partial cross-sectional structure of a battery according to a fifth exemplary embodiment;

[0020] Fig.11 is a schematic diagram of a partial cross-sectional structure of a battery according to a sixth exemplary embodiment.

[0021] The following are the descriptions of the reference numerals:

[0022] 10. Battery cell; 11. Battery cell body; 12. Ear; 20. Post assembly; 21. First part; 211. Groove; 2111. Open end surface; 2112. First section; 2113. Second section; 212. Connecting part; 213. Fixing part; 214. Connecting edge; 22. Second part; 23. Welding mark; 30. Battery case; 31. Post through hole; 32. Fixing part; 321. Connecting section; 322. Pressing section; 33. Cover plate; 331. Body; 3311. Inner surface; 3312. Outer surface; 332. Limiting section; 34. Case member; 41. First insulating member; 42. Second insulating member; 50. Adapter. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] An embodiment of the present utility model provides a battery, please refer to Figures 1 to 11The battery comprises: a battery cell 10; a battery shell 30, the battery cell 10 is arranged in the battery shell 30, a pole through hole 31 is arranged on the battery shell 30, a fixing portion 32 is arranged on the battery shell 30, the fixing portion 32 is bent into a connecting section 321 and a pressing section 322, and the connecting section 321 is arranged on the battery shell 30; a pole assembly 20, at least part of the pole assembly 20 is passed through the pole through hole 31, and the pressing section 322 is pressed on the pole assembly 20, so that at least part of the pole assembly 20 is clamped between the pressing section 322 and the battery shell 30, the pole assembly 20 is electrically connected to the battery cell 10, and the pole The assembly 20 includes a first portion 21 and a second portion 22, the first portion 21 is provided with a groove 211 on a side away from the battery cell 10, at least a portion of the second portion 22 is provided in the groove 211, the maximum thickness of the second portion 22 in a direction perpendicular to the surface of the battery housing 30 provided with the pole assembly 20 is D, the groove 211 has an open end surface 2111, the maximum dimension formed by the opposite ends of the end surface of the second portion 22 away from the battery cell 10 is L, the distance between the outer edge of the end surface of the second portion 22 away from the battery cell 10 and the circumferential outermost end of the first portion 21 is d, 0.00002≤D×d / L 2 ≤1.

[0028] A battery of one embodiment of the utility model includes a battery cell 10, a pole assembly 20 and a battery shell 30. The battery cell 10 is arranged in the battery shell 30, and the pole assembly 20 is arranged on the battery shell 30, and the pole assembly 20 is electrically connected to the battery cell 10. A groove 211 is arranged on the side of the first part 21 of the pole assembly 20 away from the battery cell 10, and the second part 22 of the pole assembly 20 is arranged in the groove 211. On the basis of ensuring the current capacity of the pole assembly 20, the overall weight of the pole assembly 20 can also be adjusted, thereby controlling the manufacturing cost of the pole assembly 20. The fixing portion 32 on the battery shell 30 is bent into a connecting section 321 and a pressing section 322, so as to form a fixed limit for the pole assembly 20 penetrating the pole through hole 31, reduce the risk of the pole assembly 20 detaching from the battery shell, and improve the safe use performance of the battery. The maximum thickness of the second portion 22 is D, the maximum size formed by the two opposite ends of the end surface of the second portion 22 away from the battery cell 10 is L, the distance between the outer edge of the end surface of the second portion 22 away from the battery cell 10 and the circumferential outermost end of the first portion 21 is d, 0.00002≤D×d / L 2 ≤1, which can not only effectively control the overall current capacity of the pole assembly 20, but also reduce the risk of fixation failure of the fixing portion 32, thereby reliably improving the safe use performance of the battery.

[0029] It should be noted that, combined with Figures 1 to 4 As shown, a pole assembly 20 may be disposed on the battery housing 30 . There may be two pole assemblies 20 , and the two pole assemblies 20 are disposed on the battery housing 30 at intervals.

[0030] Combination Figure 5 to Figure 6 As shown, the pole assembly 20 includes a first part 21 and a second part 22. A groove 211 is provided on the side of the first part 21 away from the battery cell 10, and the second part 22 is provided in the groove 211, thereby controlling the weight of the second part 22, thereby reducing the material usage of the pole assembly 20, and effectively controlling the energy density of the battery. For example, the second part 22 can occupy part of the space of the groove 211. The second part 22 can be considered as a cap, thereby forming a shielding for the groove 211 of the first part 21.

[0031] Combination Figure 6 As shown, the maximum thickness of the second portion 22 in a direction perpendicular to the surface of the battery housing 30 on which the pole assembly 20 is provided can be expressed as D, and the maximum dimension formed by the two opposite ends of the end face of the second portion 22 away from the battery cell 10 can be expressed as L. For example, the end face of the second portion 22 away from the battery cell 10 can be a circular face, and the maximum dimension L formed by the two opposite ends of the end face of the second portion 22 away from the battery cell 10 is the diameter of the circular face, or the end face of the second portion 22 away from the battery cell 10 can be a rectangular face, and the maximum dimension L formed by the two opposite ends of the end face of the second portion 22 away from the battery cell 10 is the length dimension of the rectangular face. The distance between the outer edge of the end face of the second portion 22 away from the battery cell 10 and the circumferential outermost end of the first portion 21 can be expressed as d, 0.00002≤D×d / L 2 ≤1, on the basis of effectively controlling the structural strength and the current carrying capacity of the pole assembly 20, the installation stability of the pole assembly 20 can also be ensured, thereby improving the safe use performance of the battery.

[0032] A groove 211 is provided on the side of the first part 21 away from the battery cell 10, thereby increasing the overall height of the pole assembly 20 without increasing the overall weight of the pole assembly 20, thereby reducing the initial plate thickness of the first part 21. For example, the first part 21 is formed by stamping, which can not only reduce costs, but also avoid the risk of deformation of the fixing part 32 due to the overall thickness of the pole assembly 20 being too large. The formation of the groove 211 may cause the distance d between the outer edge of the end face of the second part 22 away from the battery cell 10 and the circumferential outermost end of the first part 21 to be too small, or the maximum thickness D of the second part 22 is too thick, resulting in an increased risk of deformation of the top force-bearing fixing part 32 of the pole assembly 20, weakening the overall structural strength of the battery housing 30 and the fixing part 32, and causing battery safety risks. By making 0.00002≤D×d / L 2 ≤1, which can effectively reduce the above risks.

[0033] D×d / L 2If the value is too small, the deformation risk of the pressing section 322 increases, the pole assembly 20 drives the pressing section 322 to be stressed quickly, and the second part 22 is difficult to withstand large tension or pressure, the deformation risk of the pressing section 322 increases, and the connection strength between the first part 21 and the second part 22 of the pole assembly 20 is weak, and the overall current capacity of the battery is weakened. D×d / L 2 If the size is too large, the maximum dimension L formed by the two opposite ends of the circumferential outer edge of the opening end surface 2111 is small, resulting in a larger overall thickness of the pole assembly 20, so that the bottom of the pole assembly 20 is forced upward to squeeze the pressing section 322 as a whole, causing the risk of deformation of the pressing section 322.

[0034] D×d / L 2 It can be 0.00002, 0.00003, 0.00005, 0.00008, 0.0002, 0.0003, 0.0005, 0.0008, 0.002, 0.003, 0.005, 0.008, 0.02, 0.03, 0.05, 0.08, 0.1, 0.2, 0.3, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95 or 1, etc.

[0035] Combination Figure 5 to Figure 6 As shown, a pole through hole 31 is provided on the battery housing 30, and the pole assembly 20 is inserted into the pole through hole 31. A fixing portion 32 is provided on the battery housing 30, and the fixing portion 32 is arranged around the pole through hole 31. The fixing portion 32 is bent into a connecting section 321 and a pressing section 322. The connecting section 321 is arranged on the battery housing 30, and the pressing section 322 is pressed on the pole assembly 20, so that the pole assembly 20 is clamped between the pressing section 322 and the battery housing 30, thereby effectively preventing the pole assembly 20 from detaching from the battery housing 30, and ensuring the safe use performance of the battery.

[0036] The direction perpendicular to the surface of the battery housing 30 on which the pole assembly 20 is provided can be considered to be the direction perpendicular to the large surface of the battery housing 30 on which the pole assembly 20 is provided. For example, the battery housing 30 includes a cover plate 33, and the pole assembly 20 is provided on the cover plate 33. At this time, the direction perpendicular to the surface of the battery housing 30 on which the pole assembly 20 is provided can be considered to be the direction perpendicular to the large surface of the cover plate 33.

[0037] In one embodiment, Figure 1 and Figure 2 As shown, the battery housing 30 includes a cover plate 33, on which a pole through hole 31 is provided, and a fixing portion 32 is provided on the cover plate 33. The provision of the cover plate 33 not only facilitates the forming of the fixing portion 32, but also facilitates the subsequent installation of the pole assembly 20, thereby improving the manufacturing efficiency of the battery.

[0038] Combination Figure 1As shown, the battery housing 30 includes a cover plate 33 and a housing member 34. The cover plate 33 and the housing member 34 can be welded together, and the cover plate 33 and the fixing portion 32 can be integrally formed. For example, the cover plate 33 and the fixing portion 32 can be formed by stamping, rolling, or the like.

[0039] In one embodiment, the battery housing 30 includes a cover plate 33 and a housing member 34 , the cover plate 33 and the housing member 34 are connected, and the fixing portion 32 is disposed on the housing member 34 . The fixing portion 32 can be disposed on a side of the housing member 34 opposite to the cover plate 33 .

[0040] In one embodiment, Figure 6 and Figure 7 As shown, the battery housing 30 includes a main body 331 and a limiting section 332. The main body 331 is arranged around the limiting section 332. The limiting section 332 is provided with a pole through hole 31. The fixing portion 32 is arranged on the main body 331. At least part of the pole assembly 20 is clamped between the pressing section 322 and the limiting section 332. Therefore, the pressing section 322 and the limiting section 332 can effectively fix the pole assembly 20, reduce the risk of the pole assembly 20 detaching, and thereby improve the safe use performance of the battery.

[0041] The fixing portion 32 may be disposed on the cover plate 33 , and the cover plate 33 may include a main body 331 and a limiting section 332 . Alternatively, the fixing portion 32 may be disposed on the housing member 34 , and the housing member 34 may include a main body 331 and a limiting section 332 .

[0042] In one embodiment, the wall thickness of the main body 331 is greater than the wall thickness of the limiting section 332. On the basis of effectively controlling the structural strength of the cover plate 33, it can also avoid the cover plate 33 being too heavy, which is not conducive to controlling the battery energy density.

[0043] It should be noted that, in some embodiments, it is not excluded that the wall thickness of the main body 331 may be equal to the wall thickness of the limiting section 332 .

[0044] In one embodiment, at least a portion of the battery housing 30 is integrally connected to the fixing portion 32, which not only facilitates the molding of the battery housing 30 and the fixing portion 32, but also ensures the connection strength between the battery housing 30 and the fixing portion 32, thereby improving the safe use performance of the battery.

[0045] The cover plate 33 of the battery housing 30 can be an integrally connected structure with the fixing portion 32, and the cover plate 33 can be an integrally formed structure with the fixing portion 32. For example, a flat plate can be used to form the cover plate 33 with the fixing portion 32 by stamping, bending, etc., and by making the wall thickness of the main body 331 greater than the wall thickness of the limiting section 332, a fixing portion 32 with a certain structural strength can be formed, thereby ensuring that the fixing portion 32 effectively fixes the pole assembly 20. Alternatively, the housing member 34 of the battery housing 30 can be an integrally connected structure with the fixing portion 32.

[0046] The fixing portion 32 can be bent into a connecting section 321 and a pressing section 322 . For example, the fixing portion 32 can be effectively fixed to the pole assembly 20 by riveting, thereby improving the safety and stability of the pole assembly 20 .

[0047] The battery housing 30 includes a cover plate 33 and a housing member 34 . The cover plate 33 and the housing member 34 may be a separate structure, or the cover plate 33 and the housing member 34 may be an integrated structure.

[0048] It should be noted that, in some embodiments, it is not excluded that the cover plate 33 and the fixing portion 32 are split structures. For example, the cover plate 33 and the fixing portion 32 can be welded.

[0049] In one embodiment, Figure 6 As shown, the first part 21 includes a connecting part 212 and a fixing part 213, the fixing part 213 is connected to the circumferential outer end surface of the connecting part 212, at least part of the connecting part 212 is penetrated into the pole through hole 31, at least part of the fixing part 213 is clamped between the pressing section 322 and the battery housing 30, and a groove 211 is provided on the end surface of the connecting part 212 facing away from the battery cell 10, which can not only ensure that the first part 21 is fixed to the pressing section 322 and the limiting section 332 through the fixing part 213, but also facilitate the formation of the groove 211, thereby ensuring that the second part 22 is reliably fixed in the groove 211.

[0050] Combination Figure 8 As shown, a connecting edge 214 is formed between the circumferential outer surface of the connecting portion 212 and the end surface of the fixing portion 213 facing the battery cell 10, and the minimum distance between the connecting edge and the second portion 22 is Q, 0.15≤D / Q≤10, which can not only ensure that there is a reliable connection strength between the first portion 21 and the second portion 22, but also ensure the overall structural strength of the pole assembly 20, thereby avoiding the risk of failure of the pole assembly 20.

[0051] A connecting edge 214 is formed between the circumferential outer surface of the connecting portion 212 and the end face of the fixing portion 213 facing the battery cell 10, and the minimum distance between the connecting edge and the second portion 22 is Q. That is, it can be considered that the connecting portion 212 is arranged closer to the battery cell 10 than the fixing portion 213 to form a protruding section, and the minimum distance between the edge where the protruding section and the connecting portion 212 are connected and the second portion 22 can be Q.

[0052] Combination Figure 8 As shown, the minimum distance between the connecting edge and the second part 22 can be expressed as Q, and the ratio of the maximum thickness D of the second part 22 to the minimum distance Q between the connecting edge and the second part 22 is too small, and the connection strength between the first part 21 and the second part 22 is weak. Since the thickness at the corner formed by the first part 21 and the second part 22 is too large, that is, the minimum distance Q between the connecting edge and the second part 22 is too large, the strength of the first part 21 is too large, which causes the second part 22 to be easily deformed, affecting the connection strength between the two; and the ratio of the maximum thickness D of the second part 22 to the minimum distance Q between the connecting edge and the second part 22 is too large, the second part 22 is subjected to force, and the structural strength of the first part 21 is weak, which causes the corner formed by the first part 21 and the second part 22 to easily fail to seal with the battery casing 30, and the heat generation at the corner is serious, affecting the overall safety performance of the battery.

[0053] The ratio of the maximum thickness D of the second portion 22 to the minimum distance Q between the connecting edge 214 and the second portion 22 may be 0.15, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 or 10, etc.

[0054] And / or, in a direction perpendicular to the surface of the battery housing 30 on which the pole assembly 20 is provided, the connecting portion 212 has a bottom wall portion of the groove 211 with a thickness M, and the minimum thickness of the fixed portion 213 is N, 1.5≤M / N≤15, which can not only ensure the structural strength of the connecting portion 212, but also avoid the risk of deformation of the fixed portion 213, thereby improving the safety performance of the battery.

[0055] Combination Figure 6As shown, the thickness of the bottom wall portion of the groove 211 of the connecting portion 212 can be expressed as M, and the minimum thickness of the fixed portion 213 can be expressed as N. The ratio of the thickness M of the bottom wall portion of the groove 211 of the connecting portion 212 to the minimum thickness N of the fixed portion 213 is too small, and the deformation risk of the bottom of the connecting portion 212 increases, which affects the overall structural strength of the connection between the battery cell 10 and the pole assembly 20, and affects the connection strength between the first part 21 and the second part 22. Because if the connection strength between the pole assembly 20 and the battery housing 30 is weak, the position between the second part 22 and the first part 21 is more likely to move after deformation, and the strength is more difficult to ensure. The ratio of the thickness M of the bottom wall portion of the groove 211 of the connecting portion 212 to the minimum thickness N of the fixed portion 213 is too large, and the deformation risk of the fixed portion 213 arranged between the pressing section 322 and the limiting section 332 is relatively large, which is not conducive to improving the safe use performance of the pole assembly 20.

[0056] The ratio of the thickness M of the bottom wall portion of the groove 211 of the connecting portion 212 to the minimum thickness N of the fixing portion 213 can be 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5, 10, 10.5, 11, 11.5, 12, 12.5, 16, 16.5, 14, 14.5 or 15, etc.

[0057] In one embodiment, Figure 6 and Figure 7 As shown, the body 331 has an inner surface 3311 and an outer surface 3312 opposite to each other, and the distance between the inner surface 3311 and the outer surface 3312 may be the thickness of the body 331 .

[0058] Among them, combined Figures 5 to 7 As shown, along the direction perpendicular to the outer surface 3312, the vertical distance between the surface of the limiting segment 332 facing the battery cell 10 and the outer surface 3312 is smaller than the vertical distance between the inner surface 3311 and the outer surface 3312, that is, the surface of the limiting segment 332 facing the battery cell 10 can be located above the inner surface 3311, thereby increasing the internal space of the battery casing 30, making it easier for the pole assembly 20 to protrude from the battery casing 30 while avoiding occupying the internal space of the battery, resulting in a risk of short circuit between the battery casing 30 and the battery cell 10.

[0059] Alternatively, along the direction perpendicular to the outer surface 3312, the vertical distance between the surface of the limiting segment 332 facing the battery cell 10 and the outer surface 3312 is greater than the vertical distance between the inner surface 3311 and the outer surface 3312, that is, the surface of the limiting segment 332 facing the battery cell 10 can be located below the inner surface 3311, thereby significantly improving the structural strength of the limiting segment 332, thereby ensuring the effective fixation of the pressing segment 322 and the limiting segment 332 to the fixed part 213, thereby improving the safe use performance of the battery.

[0060] Alternatively, along the direction perpendicular to the outer surface 3312, the vertical distance between the surface of the limiting segment 332 facing the battery cell 10 and the outer surface 3312 is equal to the vertical distance between the inner surface 3311 and the outer surface 3312, that is, the surface of the limiting segment 332 facing the battery cell 10 can be flush with the inner surface 3311. On the basis of ensuring the structural strength of the limiting segment 332, it can also avoid occupying the larger space of the battery casing 30, which is beneficial to controlling the battery performance.

[0061] In one embodiment, the ratio of the thickness d1 of the main body 331 to the maximum thickness D of the second portion 22 is 0.1-4, which can not only ensure the overall connection strength between the pole assembly 20 and the battery housing 30, but also ensure the heat dissipation capacity of the battery.

[0062] Combination Figure 7 As shown, along the direction perpendicular to the surface of the battery shell 30 on which the pole assembly 20 is provided, the thickness of the main body 331 can be expressed as d1, and the ratio of the thickness d1 of the main body 331 to the maximum thickness D of the second part 22 is too small, and the deformation of the top surface of the pole assembly 20 makes it difficult for the main body 331 to bear the pressure, affecting the overall connection strength between the battery shell 30 and the pole assembly 20, and there is a risk of structural and sealing failure; the ratio of the thickness d1 of the main body 331 to the maximum thickness D of the second part 22 is too large, and the flow area at the top surface end of the pole assembly 20 is narrow, and the local heat generation seriously affects the rapid heat dissipation of the overall heat of the battery. At the same time, the gas generation inside the battery cell 10 causes the second part 22 to be deformed and other risks, affecting the connection strength and stability between the second part 22 and the first part 21.

[0063] The ratio of the thickness d1 of the main body 331 to the maximum thickness D of the second portion 22 can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.5 or 4, etc. In one embodiment, the first portion 21 and the second portion 22 are welded to ensure the connection strength between the first portion 21 and the second portion 22, and to control the current flow capacity of the first portion 21 and the second portion 22, thereby improving the safety performance of the battery.

[0064] The first part 21 and the second part 22 may be connected by laser welding, or by resistance welding, or by ultrasonic welding, etc., which is not limited here.

[0065] Combination Figure 8 As shown, the first part 21 and the second part 22 are welded together to form a weld mark 23 at the surface of the first part 21 and the second part 22 away from the battery cell 10. The weld width L1 of the weld mark 23 is 0.2mm-3mm, which can not only ensure the connection strength between the first part 21 and the second part 22, but also ensure the overall fast charging rate of the battery.

[0066] Combination Figure 8 As shown, the weld width of the weld mark 23 is the maximum width of the weld mark 23, and the weld width of the weld mark 23 can be expressed as L1. If the weld width L1 of the weld mark 23 is too small, the connection strength between the first part 21 and the second part 22 is weak, which affects the overall structural strength of the pole assembly 20; if the weld width L1 of the weld mark 23 is too large, the resistance at the weld mark 23 is large, which affects the current transmission rate between the inside and outside of the battery and reduces the overall fast charging rate of the battery.

[0067] The weld width L1 of the weld mark 23 may be a size of the weld mark 23 obtained in a direction parallel to a surface of the battery case 30 on which the electrode assembly 20 is provided.

[0068] The weld width L1 of the weld mark 23 can be 0.2mm, 0.3mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.3mm, 2.5mm, 2.8mm or 3mm, etc.

[0069] In one embodiment, L1 / L is 0.004-0.6, that is, the ratio of the weld width L1 of the weld mark 23 to the maximum dimension L formed by the two opposite ends of the end surface of the second part 22 away from the battery cell 10 can be 0.004-0.6, which can not only ensure the connection strength between the first part 21 and the second part 22, but also ensure the overall transmission rate of the battery.

[0070] The ratio of the weld width L1 of the weld mark 23 to the maximum dimension L formed by the two opposite ends of the end face of the second part 22 away from the battery cell 10 is too small, and the connection strength between the first part 21 and the second part 22 is weak, which affects the structural stability between the pole assembly 20 and the battery shell 30, causing the two to easily break and affecting the overall current transmission of the battery; the ratio of the weld width L1 of the weld mark 23 to the maximum dimension L formed by the two opposite ends of the end face of the second part 22 away from the battery cell 10 is too large, and the current transmission between the first part 21 and the second part 22 is blocked. In addition, the flow area of ​​the second part 22 is small, which further reduces the overall transmission rate of the battery.

[0071] The ratio of the weld width L1 of the weld mark 23 to the maximum dimension L formed by the opposite ends of the end surface of the second portion 22 away from the battery cell 10 can be 0.004, 0.005, 0.008, 0.01, 0.014, 0.015, 0.018, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55 or 0.6, etc.

[0072] It should be noted that the first part 21 and the second part 22 may be riveted, for example, the first part 21 and the second part 22 may be interference connected, or the first part 21 and the second part 22 may be connected using conductive adhesive.

[0073] In one embodiment, the thickness of the second portion 22 is D, 0.5 mm≤D≤5 mm, which can ensure the structural strength of the second portion 22 while avoiding affecting the structural strength of the pressing section 322 .

[0074] If the thickness D of the second part 22 is too large, the second part 22 will be deformed by force, resulting in structural damage to the pressing section 322, and the minimum distance Q between the connecting edge 214 and the second part 22 will be reduced, resulting in the pole assembly 20 being prone to structural failure at the connecting edge 214; if the thickness D of the second part 22 is too small, the connection strength between the second part 22 and the first part 21 will be weakened, the battery will locally overheat, and it will easily cause the risk of short circuit.

[0075] The thickness D of the second portion 22 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm or 5mm, etc.

[0076] In one embodiment, the minimum distance between the opening end surface 2111 and the circumferential outer edge of the end surface of the first part 21 away from the battery cell 10 is d, 0.1mm≤d≤5mm, which can not only ensure the structural strength of the first part 21, but also ensure that there is sufficient connection strength between the first part 21 and the second part 22, thereby reducing the force on the second part 22 and damaging the first part 21.

[0077] The minimum distance d between the opening end surface 2111 and the circumferential outer edge of the end surface of the first portion 21 away from the battery core 10 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm m, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm , 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm or 5mm, etc.

[0078] In one embodiment, the maximum dimension formed by the two opposite ends of the circumferential outer edge of the opening end surface 2111 is L, 5mm≤L≤50mm, thereby ensuring that the first part 21 can have a relatively large circumferential dimension, ensuring the current flow capacity of the pole assembly 20, and also controlling the connection strength between the first part 21 and the second part 22.

[0079] The maximum dimension L formed at the opposite ends of the circumferential outer edge of the opening end surface 2111 can be 5mm, 5.2mm, 5.4mm, 5.5mm, 5.6mm, 5.8mm, 6mm, 6.2mm, 6.4mm, 6.5mm, 6.6mm, 6.8mm, 7mm, 7.2mm, 7.4mm, 7.5mm, 7.6mm, 7.8mm, 8mm, 8.2mm, 8.4mm, 8.5mm, 8.6mm, 8.8mm, 9mm, 9.2mm, 9.4mm, 9.5mm, 9.6mm, 9.8mm, 10mm , 10.2mm, 10.4mm, 10.5mm, 10.6mm, 10.8mm, 11mm, 11.2mm, 11.4mm, 11.5mm, 11.6mm, 11.8mm, 12mm, 12.2mm, 12.4mm, 12.5mm, 12.6mm, 12.8mm, 13mm, 13.2mm, 13.4mm, 13.5mm, 13.6mm, 13.8mm, 14mm, 14.2mm, 14.5mm, 14.6mm, 14.8mm, 15mm, 15.2mm, 15. 4mm, 15.5mm, 15.8mm, 16mm, 16.2mm, 16.5mm, 16.8mm, 17mm, 17.2mm, 17.5mm, 17.8mm, 18mm, 18.2mm, 18.5mm, 18.8mm, 19mm, 1 9.2mm, 19.5mm, 19.8mm, 20mm, 20.2mm, 20.5mm, 20.8mm, 21mm, 21.2mm, 21.5mm, 21.8mm, 22mm, 22.2mm, 22.5mm, 22.8mm, 23mm , 23.2mm, 23.5mm, 23.8mm, 24mm, 24.2mm, 24.5mm, 24.8mm, 25mm, 25.5mm, 26mm, 26.5mm, 27mm, 27.5mm, 28mm, 28.5mm, 29mm, 30mm, 31mm, 32mm, 33mm, 34mm, 35mm, 36mm, 37mm, 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm or 50mm and so on.

[0080] In one embodiment, the distance between the second part 22 and the bottom wall of the groove 211 is H, 0.09≤D / H≤50, which can not only ensure the connection strength between the second part 22 and the first part 21 and control the current capacity of the pole assembly 20, but also avoid the failure problem of the pole assembly 20 causing structural deformation of the pressing section 322.

[0081] Combination Figure 6As shown, the distance between the second part 22 and the bottom wall of the groove 211 can be expressed as H. The ratio of the maximum thickness D of the second part 22 to the distance H between the second part 22 and the bottom wall of the groove 211 is too small, the connection strength between the second part 22 and the first part 21 is weak, and the flow area is small, which has the risk of heating and short circuit. The ratio of the maximum thickness D of the second part 22 to the distance H between the second part 22 and the bottom wall of the groove 211 is too large, and the strength of the pole assembly 20 is relatively large, resulting in the failure problem of the pole assembly 20 having structural deformation on the pressing section 322, which is not conducive to ensuring the safety performance of the battery.

[0082] 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50, etc.

[0083] In one embodiment, 0.1mm≤H≤6mm, that is, the distance H between the second portion 22 and the bottom wall of the groove 211 can be 0.1mm-6mm, thereby ensuring the structural strength of the second portion 22 and avoiding the second portion 22 being too large in size to affect the energy density of the battery.

[0084] The distance H between the second portion 22 and the bottom wall of the groove 211 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm , 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4 .5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm, 5mm, 5.1mm, 5.2mm, 5.3mm, 5.4mm, 5.5mm, 5.6mm, 5.7mm, 5.8mm, 5.9mm or 6mm, etc.

[0085] In one embodiment, the minimum thickness of the fixing portion 32 is 0.3mm-1.5mm, which can not only ensure the structural strength of the fixing portion 32, but also avoid the problem that when the thickness of the fixing portion 32 is too large, the local structural strength of the battery shell 30 is too weak when the battery shell 30 and the fixing portion 32 are formed, which is not conducive to improving the safe use performance of the battery.

[0086] The minimum thickness of the fixing portion 32 may be 0.3 mm, 0.4 mm, 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.

[0087] In one embodiment, the minimum thickness of the pressing section 322 is 0.3mm-1.5mm, which can not only ensure the structural strength of the pressing section 322 and improve the effective fixation of the pole assembly 20, but also avoid the problem that when the thickness of the pressing section 322 is too large, the local structural strength of the battery shell 30 is too weak when the battery shell 30 and the fixing part 32 are formed, which is not conducive to improving the safe use performance of the battery.

[0088] The minimum thickness of the pressing section 322 may be 0.3 mm, 0.4 mm, 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.

[0089] In one embodiment, the pole assembly 20 is arranged to pass through the pole through hole 31 at one end facing the battery cell 10, and the end surface area of ​​the pole assembly 20 facing the battery cell 10 is not larger than the area of ​​the pole through hole 31. Therefore, when the pole assembly 20 is installed, it can extend from its bottom end into the pole through hole 31 and pass through the interior of the battery shell 30, which not only facilitates the electrical connection with the battery cell 10, but also can form the positioning of the pole assembly 20 through the battery shell 30, thereby improving the installation efficiency of the battery.

[0090] The end surface area of ​​the pole assembly 20 facing the battery cell 10 can be smaller than the area of ​​the pole through hole 31 , or the end surface area of ​​the pole assembly 20 facing the battery cell 10 can be equal to the area of ​​the pole through hole 31 , thereby ensuring that the pole assembly 20 can pass through the pole through hole 31 .

[0091] In one embodiment, the dimension a of the pole through hole 31 protruding from one end of the pole assembly 20 toward the battery cell 10 is 0.2mm≤a≤3mm. This not only facilitates the electrical connection between the pole assembly 20 and the battery cell 10, but also avoids the dimension a of the pole through hole 31 protruding from one end of the pole assembly 20 toward the battery cell 10 being too large, which is not conducive to improving the space utilization of the battery.

[0092] Combination Figure 7 As shown, the dimension of the pole through hole 31 protruding from one end of the pole assembly 20 toward the battery cell 10 can be expressed as a. If the dimension a of the pole through hole 31 protruding from one end of the pole assembly 20 toward the battery cell 10 is too small, it is difficult to electrically connect the battery cell 10 and the pole assembly 20; if the dimension a of the pole through hole 31 protruding from one end of the pole assembly 20 toward the battery cell 10 is too large, the overall thickness of the pole assembly 20 is large, the distance between the battery cell 10 and the surface of the battery housing 30 where the pole assembly 20 is provided is large, the heat inside the battery is difficult to transfer quickly, and it is not conducive to improving the space utilization of the battery housing 30. The dimension a of the pole through hole 31 protruding from one end of the pole assembly 20 toward the battery cell 10 can be the dimension of the pole through hole 31 protruding from the pole assembly 20 along the large surface direction of the end surface of the battery housing 30 where the pole assembly 20 is provided.

[0093] The dimension a of the protruding pole through hole 31 of the pole assembly 20 toward one end of the battery cell 10 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm or 3mm, etc.

[0094] In one embodiment, Figures 5 to 7 As shown, the battery includes a first insulating member 41, and at least a portion of the first insulating member 41 is disposed between the fixing portion 32 and the pole assembly 20, thereby providing insulation protection between the fixing portion 32 and the pole assembly 20, and also improving the fixing ability of the fixing portion 32 to the pole assembly 20.

[0095] Among them, the thickness of the first insulating member 41 is 0.3mm-1mm, which can not only ensure the insulation capacity between the fixing part 32 and the pole assembly 20, but also avoid the first insulating member 41 being too thick and affecting the overall energy density of the battery, thereby reliably improving the battery performance.

[0096] The thickness of the first insulating member 41 may be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm, etc.

[0097] In one embodiment, at least a portion of the first insulating member 41 is disposed between the pressing section 322 and the pole assembly 20; wherein, along the extension direction of the pressing section 322, the maximum spacing between the two opposite sides of the first insulating member 41 is b, 1.5mm≤b≤5mm, that is, the insulation spacing between the pressing section 322 and the pole assembly 20 can be ensured, and the overall heat dissipation and current passing capacity of the pole assembly 20 can also be ensured, thereby improving the safe use performance of the battery.

[0098] Combination Figure 7 As shown, along the extension direction of the pressing section 322, the maximum spacing between the two opposite sides of the first insulating member 41 can be expressed as b. The maximum spacing b between the two opposite sides of the first insulating member 41 is too small, and the insulation spacing is insufficient; the maximum spacing b between the two opposite sides of the first insulating member 41 is too large, and the overall heat dissipation and flow area of ​​the pole assembly 20 are small, which is not conducive to ensuring the safe use performance of the battery. The maximum spacing b on both sides of the first insulating member 41 can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm, 4mm, 4.1mm, 4.2mm, 4.3mm, 4.4mm, 4.5mm, 4.6mm, 4.7mm, 4.8mm, 4.9mm or 5mm, etc.

[0099] The first insulating member 41 may be a plastic member, or the first insulating member 41 may be a rubber member.

[0100] In one embodiment, Figure 6 and Figure 7 As shown, the battery also includes a second insulating member 42, at least part of which is located between the battery housing 30 and the pole assembly 20, thereby ensuring the insulation capacity between the battery housing 30 and the pole assembly 20, and forming a sealed protection between the pole assembly 20 and the battery housing 30.

[0101] The second insulating member 42 may be a sealing ring.

[0102] It should be noted that the first insulating member 41 and the second insulating member 42 may be a split structure, or the first insulating member 41 and the second insulating member 42 may be an integrated structure, for example, the first insulating member 41 and the second insulating member 42 may be an integrally molded plastic structure.

[0103] In some embodiments, insulation can be formed between the pole assembly 20 and the battery housing 30, and between the fixing portion 32 and the pole assembly 20 by an insulating coating, for example, an insulating coating formed by a ceramic material such as alumina (Al2O3) or zirconium oxide (ZrO2).

[0104] In one embodiment, Figures 5 to 7 As shown, the groove 211 includes a first section 2112 and a second section 2113, the first section 2112 and the second section 2113 are connected to form a stepped groove, the first section 2112 includes a through hole, and the second section 2113 has a bottom wall. The outer edge of the end face of the first section 2112 away from the battery cell 10 has a larger orthographic projection area along the surface of the battery case 30 than the outer edge of the bottom wall of the second section 2113. At least part of the second portion 22 is located in the first section 2112 to cover the second section 2113, thereby making the interior of the pole assembly 20 a hollow structure, thereby reducing the overall weight of the pole assembly 20.

[0105] The second section 2113 is disposed closer to the battery cell 10 than the first section 2112 , which can also ensure that the second portion 22 can be quickly installed in the first section 2112 .

[0106] Combination Fig. 9 As shown, the first section 2112 and the second section 2113 are connected to form a stepped groove, the first section 2112 includes a through hole, and the second section 2113 has a bottom wall, that is, a step surface can be formed between the first section 2112 and the second section 2113, and the step surface can be considered as the bottom wall of the first section 2112, that is, the first section 2112 can include a through hole and a groove portion.

[0107] In one embodiment, the end surface of the second portion 22 away from the battery cell 10 is flush with the open end surface 2111, thereby facilitating the installation of the conductive bar when the batteries are grouped, reducing the risk of interference when installing the conductive bar, and thereby improving the grouping efficiency of the battery pack.

[0108] In one embodiment, the side wall of the first section 2112 is inclined relative to the bottom wall of the second section 22 so that the first section 2112 gradually expands from the end connected to the second section 2113 toward the open end surface 2111, which not only facilitates the installation of the second section 22, but also forms a reliable limit for the second section 22, thereby improving the installation efficiency of the battery.

[0109] In one embodiment, the angle between the side wall of the first section 2112 and the bottom wall of the second portion 22 is 90°-150°, thereby facilitating and quickly installing the second portion 22 .

[0110] The angle between the side wall of the first section 2112 and the bottom wall of the second part 22 can be 90°, 92°, 95°, 98°, 100°, 102°, 105°, 108°, 110°, 102°, 105°, 108°, 110°, 112°, 115°, 118°, 120°, 122°, 125°, 128°, 130°, 132°, 135°, 138°, 140°, 142°, 145°, 148° or 150°, etc.

[0111] In one embodiment, the distance between the outer edge of the end face of the first section 2112 facing the battery cell 10 and the outer edge of the end face of the second section 2113 away from the battery cell 10 is c, 0.5mm≤c≤4mm, which can not only form a reliable limit fixation for the second part 22, but also avoid the overall strength of the pole assembly 20 being too large, which is not conducive to improving the overall structural strength of the battery.

[0112] Combination Figure 7 As shown, the distance between the outer edge of the end face of the first section 2112 facing the battery cell 10 and the outer edge of the end face of the second section 2113 away from the battery cell 10 can be expressed as c. The distance c between the outer edge of the end face of the first section 2112 facing the battery cell 10 and the outer edge of the end face of the second section 2113 away from the battery cell 10 is too small, and it is difficult for the second part 22 to achieve limiting and stable connection; the distance c between the outer edge of the end face of the first section 2112 facing the battery cell 10 and the outer edge of the end face of the second section 2113 away from the battery cell 10 is too large, the overall strength of the pole assembly 20 is relatively large, and there is a risk of structural damage to the pressing section 322.

[0113] The distance c between the outer edge of the end face of the first section 2112 facing the battery cell 10 and the outer edge of the end face of the second section 2113 away from the battery cell 10 can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.1mm, 2.2mm, 2.3mm, 2.4mm, 2.5mm, 2.6mm, 2.7mm, 2.8mm, 2.9mm, 3mm, 3.1mm, 3.2mm, 3.3mm, 3.4mm, 3.5mm, 3.6mm, 3.7mm, 3.8mm, 3.9mm or 4mm, etc.

[0114] It should be noted that the first section 2112 and the second section 2113 are connected to form a stepped groove, the first section 2112 includes a through hole, and the second section 2113 has a bottom wall, that is, a stepped surface can be formed between the first section 2112 and the second section 2113, and the stepped surface can be considered as the bottom wall of the first section 2112, that is, the first section 2112 can include a through hole and a groove portion. The side wall of the first section 2112 is inclined relative to the bottom wall of the second part 22, that is, it can be considered that the side wall of the first section 2112 is inclined relative to the stepped surface; the angle between the side wall of the first section 2112 and the bottom wall of the second part 22 is 90°-150°, that is, it can be considered that the angle between the side wall of the first section 2112 and the stepped surface is 90°-150°; the distance between the outer edge of the end face of the first section 2112 facing the battery cell 10 and the outer edge of the end face of the second section 2113 away from the battery cell 10 is c, that is, it can be considered that the width of the stepped surface is c.

[0115] In one embodiment, the battery cell 10 includes a battery cell body 11 and a pole ear 12, and the pole ear 12 is electrically connected to the pole column assembly 20; wherein, the battery also includes an adapter plate 50, and the pole ear 12 is connected to the pole column assembly 20 through the adapter plate 50. The setting of the adapter plate 50 can adapt to different positional relationships through the adapter plate 50, facilitate the connection between the pole ear 12 and the pole column assembly 20, improve the spatial adaptability of the battery, and further improve the battery performance.

[0116] In one embodiment, the end surface of the battery cell body 11 leading out the pole ear 12 is parallel to the surface of the battery housing 30 provided with the pole assembly 20, 0.00005≤D×d / L 2 That is, the pole tab 12 can extend from the end face of the battery cell body 11 toward the surface of the battery shell 30 where the pole assembly 20 is provided, thereby improving the overall space utilization inside the battery, shortening the connection path between the pole tab 12 and the pole assembly 20, and thus improving the current transmission rate between the pole tab 12 and the pole assembly 20.

[0117] Combination Figure 3 As shown, the end surface of the pole ear 12 of the battery cell body 11 is parallel to the surface of the battery shell 30 on which the pole assembly 20 is provided, that is, the pole ear 12 of the battery cell 10 is pushed out, the pole assembly 20 is directly subjected to force, the battery cell 10 is subjected to large long-term impact inside, the connection strength between the first part 21 and the second part 22 is weak, and the thickness of the second part 22 is increased to improve the overall strength of the pole assembly 20, thereby ensuring the stability of the connection structure between the fixing part 32 of the battery shell 30 and the pole assembly 20.

[0118] The portion of the battery housing 30 where the pole assembly 20 is disposed may be a cover plate 33, and the end surface of the battery cell body 11 where the pole lug 12 is led out may be parallel to the cover plate 33, such as Figure 4 and Figure 5Two tabs 12 may be led out from the same end of the battery cell body 11 , and the two tabs 12 may be a positive tab and a negative tab, respectively.

[0119] In one embodiment, the pole tab 12 is welded to the adapter plate 50, and the pole assembly 20 is welded to the adapter plate 50; wherein, the first weld mark formed by the welding of the adapter plate 50 and the pole tab 12 and the second weld mark formed by the welding of the adapter plate 50 and the pole assembly 20 are staggered. While ensuring the connection stability between the pole tab 12 and the adapter plate 50, and the connection stability between the adapter plate 50 and the pole assembly 20, it is also possible to avoid the heat during the welding process from affecting the structural strength of the adapter plate 50 and the pole tab 12, thereby improving the safe use performance of the battery.

[0120] In one embodiment, the end surface of the battery cell body 11 leading out the pole ear 12 is perpendicular to the surface of the battery housing 30 provided with the pole assembly 20, 0.00002≤D×d / L 2 ≤0.9, thereby preventing the pole assembly 20 from being subjected to force that affects the structural strength of the pole ear 12, thereby effectively improving the safe use performance of the battery.

[0121] Combination Figure 3 As shown, the tab 12 on the battery cell body 11 can be sideways, and the adapter 50 can be roughly L-shaped, thereby being convenient for forming a connection with the tab 12 and the pole assembly 20 .

[0122] The end surface of the pole ear 12 of the battery cell body 11 is perpendicular to the surface of the battery shell 30 where the pole assembly 20 is arranged, that is, the pole ear 12 of the battery cell 10 is sideways, the top of the pole assembly 20 is not directly subjected to force, the bottom surface of the pole assembly is buffered, and the open end of the battery cell 10 is the main way for gas diffusion, so the gas is not directly subjected to force, that is, the thickness of the second part 22 can be made smaller accordingly, and the strength of the fixing part 32 of the pole assembly 20 and the battery shell 30 can also be guaranteed. However, compared with the relative arrangement of the two pole ears 12 extending from the same side of the battery cell 10 toward the surface of the battery shell 30 where the pole assembly 20 is arranged, the current transmission path between the pole ear 12 of the battery cell 10 has a larger internal resistance and serious heat generation. Therefore, it is necessary to increase the maximum size formed by the two opposite ends of the end surface of the second part 22 away from the battery cell 10 to L to increase the heat dissipation area of ​​the pole, D×d / L 2 Needs to be smaller.

[0123] In one embodiment, the first part 21 is a composite structure, the first part 21 includes a first metal and a second metal, the battery cell 10 includes a battery cell body 11 and a pole lug 12, the material of the first metal is the same as the material of the pole lug 12, and the material of the second metal is the same as the material of the conductive bar electrically connected to the adjacent battery, thereby facilitating the connection between the pole assembly 20 and the pole lug 12 and the conductive bar.

[0124] One of the first metal and the second metal may be a copper block, and the other may be an aluminum block. The copper block and the aluminum block may be adapted to connections of different structures respectively. For example, the copper block may be connected to the tab 12 , and the aluminum block may be connected to the second portion 22 .

[0125] It should be noted that the tabs 12 may include two tabs, one of which may be made of copper and connected to a copper block, while the second portion 22 may be made of aluminum and connected to an aluminum block.

[0126] In one embodiment, the first portion 21 may be an integral structure, for example, the first portion 21 may be aluminum, or the first portion 21 may be copper.

[0127] In one embodiment, the battery is a lithium iron phosphate battery, and the ratio of the maximum area enclosed by the circumferential outer edge of the second part 22 to the area enclosed by the circumferential outer edge of the surface of the battery housing 30 on which the pole assembly 20 is provided is ≤15%. The heat generation of the lithium iron phosphate battery is relatively weak, and the connection strength between the pole assembly 20 and the battery housing 30 can be increased by controlling the above ratio, thereby ensuring structural stability.

[0128] The ratio of the maximum area enclosed by the circumferential outer edge of the second part 22 to the area enclosed by the circumferential outer edge of the surface of the battery housing 30 on which the pole assembly 20 is provided can be 1%, 2%, 3%, 4%, 5%, 8%, 10%, 12%, 13%, 14% or 15%, etc.

[0129] In one embodiment, the battery is a ternary battery, and the ratio of the maximum area enclosed by the circumferential outer edge of the second part 22 to the area enclosed by the circumferential outer edge of the surface of the battery housing 30 on which the pole assembly 20 is provided is ≥2%. The overall heat generation and energy density of the ternary battery are relatively large, and the overall flow capacity can be ensured by controlling the above ratio, and the generation of stress concentration can be avoided.

[0130] The ratio of the maximum area enclosed by the circumferential outer edge of the second part 22 to the area enclosed by the circumferential outer edge of the surface of the battery housing 30 on which the pole assembly 20 is provided can be 2%, 3%, 4%, 5%, 8%, 10%, 12%, 13%, 14% or 15%, etc.

[0131] In one embodiment, Figure 8 As shown, the second part 22 protrudes from the first part 21 and is arranged away from the surface of the battery cell 10, so as to prevent the force on the second part 22 from quickly affecting the connection between the first part 21 and the second part 22, thereby buffering the stress and facilitating the electrical connection between the second part 22 and the adjacent battery through the conductive bar.

[0132] In one embodiment, Fig.10 and Fig.11 As shown, the battery also includes a first insulating member 41, and at least a portion of the first insulating member 41 is arranged on the surface of the first part 21 and the second part 22 away from the battery cell 10, so that the insulation performance between the pole assembly 20 and the battery shell 30 can be ensured by the first insulating member 41, and the first part 21 and the second part 22 are welded to form a weld mark 23, thereby ensuring the connection strength between the first part 21 and the second part 22.

[0133] In one embodiment, the orthographic projection of the end face of the pole assembly 20 set along the battery housing 30 of the first insulating member 41 is at least partially overlapped with the orthographic projection of the end face of the pole assembly 20 set along the battery housing 30 of the weld mark 23. The weld mark 23 can be shielded by the first insulating member 41 to avoid the risk of external short circuit of the battery caused by welding slag, and at the same time, the creepage distance between the pole assembly 20 and the fixing part 32 is increased, thereby improving the safe use performance of the battery.

[0134] The orthographic projection of the first insulating member 41 along the end face of the pole assembly 20 of the battery housing 30 is at least partially overlapped with the orthographic projection of the weld mark 23 along the end face of the pole assembly 20 of the battery housing 30. For example, the pole assembly 20 is arranged on the cover plate 33 of the battery housing 30, and the cover plate 33 is basically rectangular. The orthographic projections of the first insulating member 41 and the weld mark 23 on the cover plate 33 are respectively the first orthographic projection and the second orthographic projection. At this time, the first orthographic projection and the second orthographic projection have overlapping parts, and the second orthographic projection can overlap with the first orthographic projection, or part of the second orthographic projection can overlap with the first orthographic projection.

[0135] In one embodiment, the orthographic projection of the end face of the pole assembly 20 of the first insulating member 41 along the battery housing 30 and the orthographic projection of the end face of the pole assembly 20 of the weld mark 23 along the battery housing 30 do not overlap, and the weld mark 23 between the first part 21 and the second part 22 generally has a rough surface, thereby avoiding the difficulty in fitting between the first insulating member 41 and the pole assembly 20, which affects the assembly efficiency of the overall pole assembly.

[0136] The orthographic projection of the end face of the pole assembly 20 of the first insulating member 41 along the battery shell 30 and the orthographic projection of the end face of the pole assembly 20 of the weld mark 23 along the battery shell 30 do not overlap, that is, it can be considered that the first insulating member 41 is located outside the circumferential outermost edge of the weld mark 23. It can be further considered that the vertical distance between the circumferential innermost edge of the first insulating member 41 and the center line of the pole assembly 20 is not less than the vertical distance between the circumferential outermost edge of the weld mark 23 and the center line of the pole assembly 20. For example, the pole assembly 20 is arranged on the cover plate 33 of the battery shell 30, and the cover plate 33 is basically rectangular. The orthographic projections of the first insulating member 41 and the weld mark 23 on the cover plate 33 are the first orthographic projection and the second orthographic projection respectively. At this time, there is no overlapping part between the first orthographic projection and the second orthographic projection, and the first orthographic projection can be surrounded by the outside of the second orthographic projection.

[0137] In one embodiment, the orthographic projection of the end face of the pole assembly 20 of the fixing portion 32 along the battery housing 30 does not overlap with the orthographic projection of the end face of the pole assembly 20 of the second portion 22 along the battery housing 30, thereby avoiding the large riveting force during the assembly of the fixing portion 32 that causes the connection between the first portion 21 and the second portion 22 to fail, thereby ensuring the connection stability between the first portion 21 and the second portion 22, thereby improving the safe use performance of the battery.

[0138] The orthographic projection of the end face of the pole assembly 20 of the fixing portion 32 along the battery housing 30 does not overlap with the orthographic projection of the end face of the pole assembly 20 of the second portion 22 along the battery housing 30, that is, it can be considered that the fixing portion 32 is located outside the circumferential outermost edge of the second portion 22. It can be further considered that the vertical distance between the circumferential innermost edge of the fixing portion 32 and the center line of the pole assembly 20 is not less than the vertical distance between the circumferential outermost edge of the second portion and the center line of the pole assembly 20. For example, the pole assembly 20 is arranged on the cover plate 33 of the battery housing 30, and the cover plate 33 is basically rectangular. The orthographic projections of the fixing portion 32 and the second portion 22 on the cover plate 33 are the third orthographic projection and the fourth orthographic projection, respectively. At this time, the third orthographic projection and the fourth orthographic projection have no overlapping parts, and the third orthographic projection can be surrounded by the outside of the fourth orthographic projection.

[0139] In one embodiment, the fixing portion 32 is arranged along the orthographic projection of the end face of the pole assembly 20 of the battery housing 30 and the orthographic projection of the end face of the pole assembly 20 of the second portion 22 is arranged along the battery housing 30 to overlap with each other, thereby improving the overall connection strength between the battery housing 30 and the pole assembly 20, avoiding the risk of detachment when the top surface of the second portion 22 is not limited, thereby improving the overall safety performance of the battery.

[0140] In one embodiment, the orthographic projection of the end face of the pole assembly 20 of the fixing portion 32 along the battery housing 30 is overlapped with the orthographic projection of the end face of the pole assembly 20 of the second portion 22 along the battery housing 30. For example, the pole assembly 20 is arranged on the cover plate 33 of the battery housing 30, and the cover plate 33 is basically rectangular. The orthographic projections of the fixing portion 32 and the second portion 22 on the cover plate 33 are respectively the third orthographic projection and the fourth orthographic projection. At this time, the third orthographic projection can be both located within the fourth orthographic projection, or part of the third orthographic projection can be located within the fourth orthographic projection.

[0141] It should be noted that the second portion 22 may occupy part of the groove 211, such as Fig.10 Alternatively, the second portion 22 may occupy the entire groove 211, such as Fig.11 shown.

[0142] 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.

[0143] 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] It should be noted that an extreme thrust test may be performed on the above-mentioned battery to determine whether the battery can meet the safety requirements for use.

[0148] Test method:

[0149] 1. Install the pole assembly 20 on the battery housing 30. Furthermore, the pole assembly 20 can be riveted on the cover plate 33.

[0150] 2. Perform thrust test on the above battery by using the D series electronic universal testing machine of China Machinery Testing Equipment Co., Ltd. (for example, you can choose the electronic universal testing machine with specifications of DF13.204D / DF13.204T);

[0151] 3. Fix the cover plate 33 on the thrust machine;

[0152] 4. Use a thrust machine to apply thrust along the Z axis at a speed of 50 mm / min until the pole assembly 20 falls off and record the peak thrust force value.

[0153] 5. The maximum thrust is less than 1000N, which does not meet the safety requirements for battery use.

[0154]

[0155]

[0156]

[0157] In the above table, the minimum distance d between the opening end surface 2111 and the circumferential outer edge of the end surface of the first part 21 away from the battery cell 10 is in mm, the thickness D of the second part 22 is in mm, and L 2 The unit is mm 2 .

[0158] An embodiment of the utility model further provides a battery pack, comprising the above-mentioned battery.

[0159] The battery of the battery pack of one embodiment of the utility model includes a battery cell 10, a pole assembly 20 and a battery shell 30. The battery cell 10 is arranged in the battery shell 30, and the pole assembly 20 is arranged on the battery shell 30. The pole assembly 20 is electrically connected to the battery cell 10. A groove 211 is arranged on the side of the first part 21 of the pole assembly 20 away from the battery cell 10, and the second part 22 of the pole assembly 20 is arranged in the groove 211. On the basis of ensuring the current capacity of the pole assembly 20, the overall weight of the pole assembly 20 can also be adjusted, thereby controlling the manufacturing cost of the pole assembly 20. The fixing portion 32 on the battery shell 30 is bent into a connecting section 321 and a pressing section 322, so as to form a fixed limit for the pole assembly 20 penetrating the pole through hole 31, reduce the risk of the pole assembly 20 detaching from the battery shell, and improve the safe use performance of the battery. The maximum thickness of the second portion 22 is D, the maximum size formed by the two opposite ends of the end surface of the second portion 22 away from the battery cell 10 is L, the distance between the outer edge of the end surface of the second portion 22 away from the battery cell 10 and the circumferential outermost end of the first portion 21 is d, 0.00002≤D×d / L 2 ≤1, which can not only effectively control the overall current capacity of the pole assembly 20, but also reduce the risk of fixation failure of the fixing portion 32, thereby reliably improving the safe use performance of the battery pack.

[0160] In one embodiment, the battery pack is a battery module or a battery pack.

[0161] 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.

[0162] 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.

[0163] 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.

[0164] 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: Battery cell (10); A battery housing (30), wherein the battery cell (10) is arranged in the battery housing (30), a pole through hole (31) is arranged on the battery housing (30), a fixing portion (32) is arranged on the battery housing (30), the fixing portion (32) is bent into a connecting section (321) and a pressing section (322), and the connecting section (321) is arranged on the battery housing (30); A pole assembly (20), wherein at least a portion of the pole assembly (20) is inserted into the pole through hole (31), the pressing section (322) is pressed on the pole assembly (20), so that at least a portion of the pole assembly (20) is clamped between the pressing section (322) and the battery housing (30), the pole assembly (20) is electrically connected to the battery cell (10), and the pole assembly (20) comprises a first portion (21) and a second portion (22), the first portion (21) being provided with a groove (211) on a side facing away from the battery cell (10), and the second portion (22) being provided with a groove (211) on a side facing away from the battery cell (10), and the At least part of the portion (22) is arranged in the groove (211), the maximum thickness of the second portion (22) in a direction perpendicular to the surface of the battery housing (30) on which the pole assembly (20) is arranged is D, the groove (211) has an open end surface (2111), the maximum dimension formed by the two opposite ends of the end surface of the second portion (22) away from the battery cell (10) is L, the distance between the outer edge of the end surface of the second portion (22) away from the battery cell (10) and the circumferential outermost end of the first portion (21) is d, and 0.00002≤D×d / L 2 ≤1.

2. The battery according to claim 1, characterized in that The battery housing (30) comprises a cover plate (33) and a housing member (34); the cover plate (33) and the housing member (34) are connected; and the fixing portion (32) is arranged on the cover plate (33) or the housing member (34).

3. The battery according to claim 1, characterized in that The battery housing (30) comprises a main body (331) and a limiting section (332); the main body (331) is arranged around the limiting section (332); the limiting section (332) is provided with the pole through hole (31); the fixing portion (32) is arranged on the main body (331); and at least part of the pole assembly (20) is clamped between the pressing section (322) and the limiting section (332).

4. The battery according to claim 3, characterized in that The wall thickness of the main body (331) is greater than the wall thickness of the limiting section (332).

5. The battery according to claim 3, characterized in that The main body (331) has an inner surface (3311) and an outer surface (3312) opposite to each other; Wherein, along a direction perpendicular to the outer surface (3312), a vertical distance between a surface of the limiting segment (332) facing the battery core (10) and the outer surface (3312) is smaller than a vertical distance between the inner surface (3311) and the outer surface (3312); Alternatively, along a direction perpendicular to the outer surface (3312), a vertical distance between a surface of the limiting segment (332) facing the battery core (10) and the outer surface (3312) is greater than a vertical distance between the inner surface (3311) and the outer surface (3312); Alternatively, along a direction perpendicular to the outer surface (3312), the vertical distance between the surface of the limiting segment (332) facing the battery core (10) and the outer surface (3312) is equal to the vertical distance between the inner surface (3311) and the outer surface (3312).

6. The battery according to claim 3, characterized in that The ratio of the thickness d1 of the main body (331) to the maximum thickness D of the second portion (22) is 0.1-4.

7. The battery according to claim 1, characterized in that At least a portion of the battery housing (30) and the fixing portion (32) are integrally connected.

8. The battery according to claim 1, characterized in that The first part (21) comprises a connecting part (212) and a fixing part (213), the fixing part (213) being connected to the circumferential outer end surface of the connecting part (212), at least a portion of the connecting part (212) being inserted into the pole through hole (31), at least a portion of the fixing part (213) being clamped between the pressing section (322) and the battery housing (30), and the end surface of the connecting part (212) facing away from the battery cell (10) being provided with the groove (211); A connecting edge (214) is formed between the circumferential outer surface of the connecting portion (212) and the end surface of the fixing portion (213) facing the battery cell (10), and the minimum distance between the connecting edge (214) and the second portion (22) is Q, 0.15≤D / Q≤10; and / or, along a direction perpendicular to the surface of the battery housing (30) on which the pole assembly (20) is provided, the connecting portion (212) has a bottom wall portion of the groove (211) with a thickness of M, and the minimum thickness of the fixing portion (213) is N, 1.5≤M / N≤15.

9. The battery according to claim 1, characterized in that The first part (21) and the second part (22) are connected by welding to form a weld mark (23) on the surface of the first part (21) and the second part (22) away from the battery core (10), and the weld width L1 of the weld mark (23) is 0.2 mm-3 mm.

10. The battery according to claim 9, characterized in that L1 / L is 0.004-0.

6.

11. The battery according to claim 1, characterized in that 0.5mm≤D≤5mm, and / or, 0.1mm≤d≤5mm, and / or, 5mm≤L≤50mm.

12. The battery according to claim 1, characterized in that The distance between the second portion (22) and the bottom wall of the groove (211) is H, 0.09≤D / H≤50, and / or, 0.1mm≤H≤6mm.

13. The battery according to claim 1, characterized in that The minimum thickness of the fixing portion (32) is 0.3 mm to 1.5 mm, and / or the minimum thickness of the pressing section (322) is 0.3 mm to 1.5 mm.

14. The battery according to claim 1, characterized in that One end of the pole assembly (20) facing the battery core (10) is arranged to pass through the pole through hole (31), and the end surface area of ​​the pole assembly (20) facing the battery core (10) is not greater than the area of ​​the pole through hole (31).

15. The battery according to claim 14, characterized in that The dimension of the end of the pole assembly (20) protruding toward the battery cell (10) from the pole through hole (31) is a, and 0.2 mm≤a≤3 mm.

16. The battery according to any one of claims 1 to 15, characterized in that The groove (211) comprises a first section (2112) and a second section (2113), the first section (2112) and the second section (2113) are connected to form a stepped groove, the first section (2112) comprises a through hole, the second section (2113) has a bottom wall, the outer edge of the end face of the first section (2112) facing away from the battery cell (10) has a greater orthographic projection area along the surface of the battery housing (30) than the outer edge of the bottom wall of the second section (2113) has a orthographic projection area along the surface of the battery housing (30), and at least part of the second portion (22) is located in the first section (2112) to cover the second section (2113); Wherein, the second section (2113) is arranged closer to the battery cell (10) than the first section (2112).

17. The battery according to claim 16, characterized in that An end surface of the second portion (22) away from the battery core (10) is flush with the opening end surface (2111).

18. The battery according to claim 16, characterized in that The side wall of the first section (2112) is arranged to be inclined relative to the bottom wall of the second part (22), so that the first section (2112) gradually expands from the end connected to the second section (2113) toward the open end surface (2111).

19. The battery according to claim 16, characterized in that The angle between the side wall of the first section (2112) and the bottom wall of the second portion (22) is 90°-150°.

20. The battery according to claim 16, characterized in that The distance between the outer edge of the end face of the first section (2112) facing the battery core (10) and the outer edge of the end face of the second section (2113) away from the battery core (10) is c, and 0.5 mm ≤ c ≤ 4 mm.

21. The battery according to any one of claims 1 to 15, characterized in that The battery cell (10) comprises a battery cell body (11) and a pole ear (12), and the pole ear (12) is electrically connected to the pole column assembly (20); The battery further comprises an adapter sheet (50), and the pole lug (12) is connected to the pole column assembly (20) via the adapter sheet (50).

22. The battery according to claim 21, characterized in that The end surface of the battery cell body (11) leading out the pole ear (12) is parallel to the surface of the battery housing (30) on which the pole assembly (20) is arranged, 0.00005≤D×d / L 2 .

23. The battery according to claim 22, characterized in that The pole lug (12) is welded to the adapter plate (50), and the pole column assembly (20) is welded to the adapter plate (50); Wherein, a first weld mark formed by welding the adapter plate (50) and the pole lug (12) is staggered with a second weld mark formed by welding the adapter plate (50) and the pole assembly (20).

24. The battery according to claim 21, characterized in that The end surface of the battery cell body (11) leading out the pole ear (12) is perpendicular to the surface of the battery housing (30) on which the pole assembly (20) is arranged, 0.00002≤D×d / L 2 ≤0.

9.

25. The battery according to any one of claims 1 to 15, characterized in that The first part (21) is a composite structure, the first part (21) comprises a first metal and a second metal, the battery cell (10) comprises a battery cell body (11) and a tab (12), the material of the first metal is the same as the material of the tab (12), and the material of the second metal is the same as the material of a conductive bar electrically connected to adjacent batteries.

26. The battery according to any one of claims 1 to 15, characterized in that The battery is a lithium iron phosphate battery, and the ratio of the maximum area enclosed by the circumferential outer edge of the second part (22) to the area enclosed by the circumferential outer edge of the surface of the battery housing (30) on which the pole assembly (20) is arranged is ≤15%.

27. The battery according to any one of claims 1 to 15, characterized in that The battery is a ternary battery, and the ratio of the maximum area enclosed by the circumferential outer edge of the second part (22) to the area enclosed by the circumferential outer edge of the surface of the battery housing (30) on which the pole assembly (20) is arranged is ≥ 2%.

28. The battery according to any one of claims 1 to 15, characterized in that The battery is a quadrangular prism battery.

29. The battery according to any one of claims 1 to 15, characterized in that The second portion (22) protrudes from the first portion (21) and is arranged away from the surface of the battery cell (10).

30. The battery according to claim 29, characterized in that The battery further comprises a first insulating member (41), at least part of which is arranged on the surface of the first part (21) and the second part (22) facing away from the battery cell (10), and the first part (21) and the second part (22) are welded to form a weld mark (23).

31. The battery according to claim 30, characterized in that The orthographic projection of the first insulating member (41) on the end surface of the pole assembly (20) disposed along the battery housing (30) is at least partially overlapped with the orthographic projection of the weld mark (23) on the end surface of the pole assembly (20) disposed along the battery housing (30).

32. The battery according to claim 30, characterized in that The orthographic projection of the first insulating member (41) on the end face of the pole assembly (20) disposed along the battery housing (30) does not overlap with the orthographic projection of the weld mark (23) on the end face of the pole assembly (20) disposed along the battery housing (30).

33. The battery according to claim 29, characterized in that The orthographic projection of the end face of the pole assembly (20) disposed along the battery housing (30) of the fixing portion (32) does not overlap with the orthographic projection of the end face of the pole assembly (20) disposed along the battery housing (30) of the second portion (22).

34. The battery according to claim 29, characterized in that The orthographic projection of the end face of the pole assembly (20) disposed along the battery housing (30) of the fixing portion (32) is partially overlapped with the orthographic projection of the end face of the pole assembly (20) disposed along the battery housing (30) of the second portion (22).

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