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

[0001] This case is a divisional case of application number 202420557064.0, application date 2024.03.21, and invention name “Battery”. Technical Field

[0002] The utility model relates to the technical field of batteries, in particular to a battery. Background Art

[0003] 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

[0004] The utility model provides a battery to improve the performance of the battery.

[0005] The utility model provides a battery, comprising:

[0006] battery cells;

[0007] A battery housing, wherein the battery cell is disposed in the battery housing, the battery housing is provided with a terminal through hole, the battery housing is provided with a fixing portion, the fixing portion is bent into a connecting section and a pressing section, and the connecting section is provided on the battery housing;

[0008] A pole assembly, at least a portion of the pole assembly is passed through the pole through-hole, the pressing section is pressed on the pole assembly so that at least a portion 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 facing away from the battery cell, at least a portion of the second part is provided in the groove, the maximum thickness of the second part in a direction perpendicular to the surface of the battery shell on which the pole assembly is provided is D, the groove has an open end face, the maximum dimension formed by the opposite ends of the end face of the second part facing away from the battery cell is L, the distance between the outer edge of the end face of the second part facing away from the battery cell and the circumferential outermost end of the first part is d, 0.00002≤D×d / L 2 ≤1.

[0009] The battery of the embodiment of the present invention includes a battery cell, a pole assembly and a battery shell. The battery cell is arranged in the battery shell, the pole assembly is arranged on the battery shell, and the pole assembly is electrically connected to the battery cell. A groove is provided on the side of the first part of the pole assembly facing away from the battery cell, and the second part of the pole assembly is provided in the groove. On the basis of ensuring the overcurrent 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 shell is bent into a connecting section and a pressing section, thereby forming a fixed limit for the pole assembly passing through the pole through hole, reducing the risk of the pole assembly detaching from the battery shell, and improving 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 second part facing away from the end face of the battery cell is L, the distance between the outer edge of the end face of the second part facing 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 on 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 If the value of is too small, the force on the top of the pole assembly will be quickly transferred to the fixing part, that is, D×d is too small, the strength of the second part is weak, and the risk of deformation of the battery shell is greater, which reduces the connection strength of the fixing part to the pole assembly, affecting the structural stability between the pole assembly and the battery shell. 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 terminal assembly is narrow, and the overall thickness of the terminal assembly is large, which increases the risk of internal gassing or deformation of the internal battery structure, leading to deformation of the fixed part of the battery casing. By adjusting the above ratio, not only can the overall flow capacity of the terminal assembly be effectively controlled, but the risk of fixed part failure can also be reduced, thereby reliably improving the safe use performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] For a better understanding of 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:

[0011] Figure 1 is a schematic structural diagram of a battery according to an exemplary embodiment;

[0012] Figure 2 is a schematic diagram of a partial structure of a battery according to an exemplary embodiment;

[0013] Figure 3 is a schematic diagram of a partially exploded structure of a battery according to an exemplary embodiment;

[0014] Figure 4 is a schematic diagram of a partially exploded structure of a battery according to another exemplary embodiment;

[0015] Figure 5 is a schematic diagram of a partial cross-sectional structure of a battery according to a first exemplary embodiment;

[0016] Figure 6 is a schematic diagram of a partial cross-sectional structure of a battery according to a second exemplary embodiment;

[0017] Figure 7 is a schematic diagram of a partial cross-sectional structure of a battery according to a third exemplary embodiment;

[0018] Figure 8 is a schematic diagram of a partial cross-sectional structure of a battery according to a fourth exemplary embodiment;

[0019] Figure 9 is a schematic diagram of a partial cross-sectional exploded structure of a battery according to an exemplary embodiment;

[0020] Figure 10 is a schematic diagram of a partial cross-sectional structure of a battery according to a fifth exemplary embodiment;

[0021] Figure 11 is a schematic diagram of a partial cross-sectional structure of a battery according to a sixth exemplary embodiment.

[0022] The following are the descriptions of the reference numerals:

[0023] 10. Battery cell; 11. Battery cell body; 12. Tab; 20. Post assembly; 21. First part; 211. Groove; 2111. Open end face; 2112. First section; 2113. Second section; 212. Connecting portion; 213. Fixing portion; 214. Connecting edge; 22. Second part; 23. Welding mark; 30. Battery case; 31. Post through hole; 32. Fixing portion; 321. Connecting section; 322. Pressing section; 33. Cover; 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

[0024] 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 for illustrative purposes only 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.

[0025] In the description of this disclosure, unless otherwise expressly provided or limited, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more; and the term "and / or" includes any and all combinations of one or more of the associated listed items. In particular, reference to "the" or "an" object is also intended to mean one of a possible plurality of such objects.

[0026] Unless otherwise specified or explained, the terms "connect," "fixed," etc. should be understood broadly. For example, "connected" may refer to a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; and "connected" may refer to a direct connection or an indirect connection through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this disclosure based on specific circumstances.

[0027] Furthermore, in the description of the present disclosure, it should be understood that the directional words such as “upper”, “lower”, “inner” and “outer” described in the example embodiments of the present disclosure are described based on the angles shown in the accompanying drawings and should not be understood as limiting the example 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” or “outer”, it can not only be directly connected to the other (one or more) elements “upper”, “lower” or “inner” or “outer”, but can also be indirectly connected to the other (one or more) elements “upper”, “lower” or “inner” or “outer” through an intermediate element.

[0028] An embodiment of the present invention provides a battery. Figures 1 to 11The battery includes: a battery cell 10; a battery shell 30, the battery cell 10 is arranged in the battery shell 30, a terminal through hole 31 is provided on the battery shell 30, a fixing portion 32 is provided on the battery shell 30, the fixing portion 32 is bent into a connecting section 321 and a pressing section 322, the connecting section 321 is provided 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, 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 facing 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 on which the terminal assembly 20 is provided 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 facing away from the battery cell 10 is L. The distance between the outer edge of the end surface of the second portion 22 facing 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.

[0029] A battery according to one embodiment of the present invention includes a cell 10, a pole assembly 20, and a battery housing 30. The cell 10 is disposed in the battery housing 30, and the pole assembly 20 is disposed on the battery housing 30. The pole assembly 20 is electrically connected to the cell 10. A first portion 21 of the pole assembly 20 is provided with a groove 211 on the side facing away from the cell 10, and a second portion 22 of the pole assembly 20 is provided in the groove 211. While 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 housing 30 is bent into a connecting section 321 and a pressing section 322, thereby forming a fixed limit for the pole assembly 20 passing through the pole through hole 31, reducing the risk of the pole assembly 20 detaching from the battery housing and improving the safe use performance of the battery. The maximum thickness of the second portion 22 is D, the maximum dimension formed by the two opposite ends of the second portion 22 away from the end surface of the battery cell 10 is L, and 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 overcurrent 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.

[0030] It should be noted that, combined with Figures 1 to 4 As shown, a pole assembly 20 may be provided on the battery housing 30 . There may be two pole assemblies 20 , and the two pole assemblies 20 are provided on the battery housing 30 at intervals.

[0031] Combine Figures 5 and 6 As shown, the terminal assembly 20 includes a first portion 21 and a second portion 22. A groove 211 is provided on the side of the first portion 21 facing away from the battery cell 10. The second portion 22 is disposed in the groove 211. This allows the weight of the second portion 22 to be controlled, thereby reducing the material usage of the terminal assembly 20 and effectively controlling the energy density of the battery. For example, the second portion 22 can occupy part of the space in the groove 211. The second portion 22 can be considered a cap, thereby shielding the groove 211 of the first portion 21.

[0032] Combine 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 surface, 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 surface, or the end face of the second portion 22 away from the battery cell 10 can be a rectangular surface, 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 surface. 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 overcurrent 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.

[0033] A groove 211 is provided on the side of the first part 21 facing 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 not only reduces costs but also avoids the overall thickness of the pole assembly 20 being too large, which increases the risk of deformation of the fixing part 32. The formation of the groove 211 may cause the distance d between the outer edge of the end face of the second part 22 facing 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 force-bearing fixing part 32 at the top of the pole assembly 20, weakening the overall structural strength of the battery shell 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.

[0034] D×d / L 2If the value is too small, the risk of deformation of the pressing section 322 increases. The pole assembly 20 drives the pressing section 322 to be stressed quickly, while the second portion 22 cannot withstand large tension or pressure. The risk of deformation of the pressing section 322 increases. At the same time, the connection strength between the first portion 21 and the second portion 22 of the pole assembly 20 is weak, and the overall current capacity of the battery is weakened. 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 to squeeze the pressing section 322 upward as a whole, causing the risk of deformation of the pressing section 322.

[0035] 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.

[0036] Combine Figures 5 and 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 provided 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, thereby ensuring the safe use performance of the battery.

[0037] 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.

[0038] In one embodiment, Figure 1 and Figure 2 As shown, the battery housing 30 includes a cover plate 33, a pole through hole 31 is provided on the cover plate 33, and a fixing portion 32 is provided on the cover plate 33. The setting 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.

[0039] Combine 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, etc.

[0040] In one embodiment, the battery housing 30 includes a cover plate 33 and a housing member 34 , which are connected to each other. The fixing portion 32 is disposed on the housing member 34 , and the fixing portion 32 can be disposed on a side of the housing member 34 opposite to the cover plate 33 .

[0041] 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 provided 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. As a result, 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.

[0042] The fixing portion 32 may be disposed on the cover plate 33 , which may include a main body 331 and a limiting section 332 . Alternatively, the fixing portion 32 may be disposed on the housing 34 , which may include a main body 331 and a limiting section 332 .

[0043] 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.

[0044] It should be noted that, in some embodiments, it is not ruled out that the wall thickness of the main body 331 may be equal to the wall thickness of the limiting section 332 .

[0045] In one embodiment, at least a portion of the battery housing 30 and the fixing portion 32 are integrally connected, 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.

[0046] The cover plate 33 of the battery housing 30 can be integrally connected to the fixing portion 32. The cover plate 33 and the fixing portion 32 can be integrally formed. For example, the cover plate 33 having the fixing portion 32 can be formed by stamping, bending, or the like from a flat plate. 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 terminal assembly 20. Alternatively, the housing member 34 of the battery housing 30 can be integrally connected to the fixing portion 32.

[0047] 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 .

[0048] 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 separate structures, or the cover plate 33 and the housing member 34 may be an integrated structure.

[0049] 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 together.

[0050] 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 passed through the pole through hole 31, at least part of the fixing part 213 is clamped between the pressing section 322 and the battery shell 30, and a groove 211 is provided on the end surface of the connecting part 212 facing away from the battery cell 10, which not only ensures that the first part 21 is fixed to the pressing section 322 and the limiting section 332 through the fixing part 213, but also facilitates the formation of the groove 211, thereby ensuring that the second part 22 is reliably fixed in the groove 211.

[0051] Combine Figure 8 As shown, 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, 0.15≤D / Q≤10, which can not only ensure that there is 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.

[0052] A connecting edge 214 is formed between the circumferential outer surface of the connecting part 212 and the end face of the fixing part 213 facing the battery cell 10, and the minimum distance between the connecting edge and the second part 22 is Q, that is, it can be considered that the connecting part 212 is arranged closer to the battery cell 10 than the fixing part 213 to form a protruding section, and the minimum distance between the edge where the protruding section and the connecting part 212 are connected and the second part 22 can be Q.

[0053] Combine 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 of 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 shell 30, and serious heat generation at the corner affects the overall safety performance of the battery.

[0054] 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 can 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.

[0055] 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 fixing portion 213 is N, 1.5≤M / N≤15, which not only ensures the structural strength of the connecting portion 212, but also avoids the risk of deformation of the fixing portion 213, thereby improving the safety performance of the battery.

[0056] Combine 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 fixing portion 213 can be expressed as N. If 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 is too small, the risk of deformation of the bottom of the connecting portion 212 increases, affecting the overall structural strength of the connection between the battery cell 10 and the terminal assembly 20, and affecting the connection strength between the first portion 21 and the second portion 22. Because if the connection strength between the terminal assembly 20 and the battery housing 30 is weak, the position of the second portion 22 and the first portion 21 is more likely to shift after deformation, making it more difficult to ensure strength. If 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 is too large, the risk of deformation of the fixing portion 213 disposed between the pressing section 322 and the limiting section 332 is greater, which is not conducive to improving the safe use performance of the terminal assembly 20.

[0057] 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.

[0058] In one embodiment, Figure 6 and Figure 7 As shown, the main 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 main body 331 .

[0059] 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 section 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 section 332 facing the battery cell 10 can be located above the inner surface 3311, thereby increasing the internal space of the battery shell 30, making it convenient for the pole assembly 20 to protrude from the battery shell 30 while avoiding occupying the internal space of the battery, resulting in a short circuit risk between the battery shell 30 and the battery cell 10.

[0060] Alternatively, along the direction perpendicular to the outer surface 3312, the vertical distance between the surface of the limiting section 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 section 332 facing the battery cell 10 can be located below the inner surface 3311, thereby significantly improving the structural strength of the limiting section 332, thereby ensuring the effective fixation of the pressing section 322 and the limiting section 332 to the fixed part 213, thereby improving the safe use performance of the battery.

[0061] Alternatively, along the direction perpendicular to the outer surface 3312, the vertical distance between the surface of the limiting section 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 section 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 section 332, it can also avoid occupying the larger space of the battery casing 30, which is conducive to controlling the battery performance.

[0062] 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 capability of the battery.

[0063] Combine 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. The ratio of the thickness d1 of the main body 331 to the maximum thickness D of the second part 22 is too small. The deformation of the top surface of the pole assembly 20 makes it difficult for the main body 331 to bear 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. 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, etc., affecting the connection strength and stability between the second part 22 and the first part 21.

[0064] 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 together, which not only ensures the connection strength between the first portion 21 and the second portion 22, but also controls the flow capacity of the first portion 21 and the second portion 22, thereby improving the safety performance of the battery.

[0065] The first part 21 and the second part 22 can be connected by laser welding, or by resistance welding, or by ultrasonic welding, etc., which is not limited here.

[0066] Combine 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.

[0067] Combine 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.

[0068] The weld width L1 of the weld mark 23 may be a dimension of the weld mark 23 obtained in a direction parallel to the surface of the battery case 30 on which the electrode assembly 20 is provided.

[0069] The weld width L1 of the weld mark 23 can be 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.3 mm, 2.5 mm, 2.8 mm or 3 mm, etc.

[0070] 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 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.

[0071] 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.

[0072] The ratio of the weld width L1 of the weld mark 23 to the maximum dimension L formed by the opposite ends of the second portion 22 away from the end surface of 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.

[0073] It should be noted that the first part 21 and the second part 22 can be riveted, for example, the first part 21 and the second part 22 can be interference connected, or the first part 21 and the second part 22 can be connected using conductive glue.

[0074] 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 .

[0075] If the thickness D of the second part 22 is too large, the second part 22 will be deformed under 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, causing the pole assembly 20 to easily fail structurally 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.

[0076] The thickness D of the second portion 22 may be 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.1 mm, 1.2 mm, 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, 1.7 mm, 1.8 mm, 1.9 mm, 2 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.4 mm, 2.5 mm, 2.6 mm, 2.7 mm, 2.8 mm, 2.9 mm, 3 mm, 3.1 mm, 3.2 mm, 3.3 mm, 3.4 mm, 3.5 mm, 3.6 mm, 3.7 mm, 3.8 mm, 3.9 mm, 4 mm, 4.1 mm, 4.2 mm, 4.3 mm, 4.4 mm, 4.5 mm, 4.6 mm, 4.7 mm, 4.8 mm, 4.9 mm or 5 mm, etc.

[0077] In one embodiment, the minimum distance between the opening end face 2111 and the circumferential outer edge of the end face of the first part 21 away from the battery cell 10 is d, 0.1mm≤d≤5mm, which not only ensures the structural strength of the first part 21, but also ensures that there is sufficient connection strength between the first part 21 and the second part 22, reducing the force on the second part 22 and damaging the first part 21.

[0078] 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 cell 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.

[0079] In one embodiment, the maximum dimension formed at the 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.

[0080] 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, etc.

[0081] In one embodiment, the distance between the second portion 22 and the bottom wall of the groove 211 is H, 0.09≤D / H≤50, which not only ensures the connection strength between the second portion 22 and the first portion 21 and controls the overcurrent capacity of the pole assembly 20, but also avoids the failure problem of the pole assembly 20 causing structural deformation of the pressing section 322.

[0082] Combine Figure 6As shown, the distance between the second portion 22 and the bottom wall of the groove 211 can be represented as H. If the ratio of the maximum thickness D of the second portion 22 to the distance H between the second portion 22 and the bottom wall of the groove 211 is too small, the connection strength between the second portion 22 and the first portion 21 will be weak, and the flow area will be small, which may lead to risks such as thermal short circuit. If the ratio of the maximum thickness D of the second portion 22 to the distance H between the second portion 22 and the bottom wall of the groove 211 is too large, the strength of the terminal assembly 20 will be too high, resulting in structural deformation and failure of the terminal assembly 20 against the pressing section 322, which is not conducive to ensuring the safety performance of the battery.

[0083] 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49 or 50, etc.

[0084] 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, which affects the energy density of the battery.

[0085] 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.

[0086] In one embodiment, the minimum thickness of the fixing portion 32 is 0.3 mm to 1.5 mm, which not only ensures the structural strength of the fixing portion 32 but also avoids the problem that when the thickness of the fixing portion 32 is too large, the local structural strength of the battery housing 30 is too weak when the battery housing 30 and the fixing portion 32 are formed, which is not conducive to improving the safe use performance of the battery.

[0087] 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.

[0088] In one embodiment, the minimum thickness of the pressing section 322 is 0.3mm-1.5mm, which not only ensures the structural strength of the pressing section 322 and improves the effective fixation of the pole assembly 20, but also avoids 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 forming the battery shell 30 and the fixing part 32, which is not conducive to improving the safe use performance of the battery.

[0089] 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.

[0090] 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.

[0091] 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 .

[0092] In one embodiment, the dimension a of the protruding pole through hole 31 of the pole assembly 20 toward one end of the battery cell 10 is 0.2mm≤a≤3mm, which not only facilitates the electrical connection between the pole assembly 20 and the battery cell 10, but also avoids the dimension a of the protruding pole through hole 31 of the pole assembly 20 toward one end of the battery cell 10 being too large, which is not conducive to improving the space utilization of the battery.

[0093] Combine Figure 7 As shown, the dimension of the terminal assembly 20 protruding from the terminal through-hole 31 at one end of the battery cell 10 can be represented as a. If the dimension a of the terminal assembly 20 protruding from the terminal through-hole 31 at one end of the battery cell 10 is too small, it will be difficult to electrically connect the battery cell 10 and the terminal assembly 20. If the dimension a of the terminal assembly 20 protruding from the terminal through-hole 31 at one end of the battery cell 10 is too large, the overall thickness of the terminal assembly 20 will be large, and the distance between the battery cell 10 and the surface of the battery housing 30 where the terminal assembly 20 is provided will be large, making it difficult to quickly transfer heat from the battery and hindering the space utilization of the battery housing 30. The dimension a of the terminal assembly 20 protruding from the terminal through-hole 31 at one end of the battery cell 10 can be the dimension of the terminal assembly 20 protruding from the terminal through-hole 31 along the large surface of the battery housing 30 perpendicular to the end surface where the terminal assembly 20 is provided.

[0094] 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.

[0095] 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 arranged between the fixing portion 32 and the pole assembly 20, thereby forming 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.

[0096] Among them, the thickness of the first insulating member 41 is 0.3mm-1mm, which not only ensures the insulation capacity between the fixing part 32 and the pole assembly 20, but also avoids the thickness of the first insulating member 41 being too large and affecting the overall energy density of the battery, thereby reliably improving the battery performance.

[0097] 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.

[0098] 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 overcurrent capacity of the pole assembly 20 can also be ensured, thereby improving the safe use performance of the battery.

[0099] Combine Figure 7 As shown, along the extension direction of the pressing section 322, the maximum distance between the two opposite sides of the first insulating member 41 can be expressed as b. The maximum distance b between the two opposite sides of the first insulating member 41 is too small, and the insulation distance is insufficient; if the maximum distance b between the two opposite sides of the first insulating member 41 is too large, 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 distance b between the two opposite 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.

[0100] The first insulating member 41 may be a plastic member, or the first insulating member 41 may be a rubber member.

[0101] 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 can form a sealed protection between the pole assembly 20 and the battery housing 30.

[0102] The second insulating member 42 may be a sealing ring.

[0103] 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.

[0104] 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 using a ceramic material such as alumina (Al2O3) or zirconium oxide (ZrO2).

[0105] In one embodiment, Figures 5 to 7 As shown, the groove 211 includes a first section 2112 and a second section 2113, and 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 facing away from the battery cell 10 has a larger positive projection area along the surface of the battery shell 30 than the outer edge of the bottom wall of the second section 2113. At least part of the second part 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.

[0106] The second section 2113 is arranged 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 .

[0107] Combine Figure 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 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.

[0108] In one embodiment, the end face of the second portion 22 away from the battery cell 10 is flush with the open end face 2111, thereby facilitating the installation of the conductive bar when the batteries are grouped, reducing the risk of interference during the installation of the conductive bar, and thereby improving the grouping efficiency of the battery pack.

[0109] 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.

[0110] 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 .

[0111] 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.

[0112] 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.

[0113] Combine 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.

[0114] 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.

[0115] 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. This means that a stepped surface can be formed between the first section 2112 and the second section 2113. The stepped surface can be considered the bottom wall of the first section 2112, meaning that the first section 2112 can include both a through hole and a groove. The sidewalls of the first section 2112 are inclined relative to the bottom wall of the second section 22, meaning that the sidewalls of the first section 2112 can be considered inclined relative to the stepped surface. The angle between the sidewalls of the first section 2112 and the bottom wall of the second section 22 is between 90° and 150°, meaning that the angle between the sidewalls of the first section 2112 and the stepped surface is between 90° and 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 facing away from the battery cell 10 is c, meaning that the width of the stepped surface is c.

[0116] In one embodiment, the battery cell 10 includes a battery cell body 11 and a tab 12, and the tab 12 is electrically connected to the pole assembly 20; wherein, the battery also includes an adapter plate 50, and the tab 12 is connected to the pole 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 tab 12 and the pole assembly 20, improve the spatial adaptability of the battery, and thereby improve the battery's performance.

[0117] In one embodiment, the end surface of the battery cell body 11 leading out the tab 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 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 tab 12 and the pole assembly 20, and thus improving the current transmission rate between the tab 12 and the pole assembly 20.

[0118] Combine Figure 3 As shown, the end face of the tab 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 tab 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 a large long-term impact inside, and the connection strength between the first part 21 and the second part 22 is weak. Increasing the thickness of the second part 22 improves the overall strength of the pole assembly 20 and ensures the stability of the connection structure between the fixing part 32 of the battery shell 30 and the pole assembly 20.

[0119] The portion of the battery housing 30 where the pole assembly 20 is provided may be a cover plate 33, and the end surface of the battery cell body 11 where the pole tab 12 is led out may be parallel to the cover plate 33. 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.

[0120] In one embodiment, the 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 welding the adapter plate 50 to the tab 12 and the second weld mark formed by welding the adapter plate 50 to the pole assembly 20 are staggered. On the basis of ensuring the connection stability between the 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 affecting the structural strength of the adapter plate 50 and the tab 12, thereby improving the safe use performance of the battery.

[0121] In one embodiment, the end surface of the battery cell body 11 leading out the tab 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 stress that affects the structural strength of the tab 12, thereby effectively improving the safe use performance of the battery.

[0122] Combine Figure 3 As shown, the tab 12 on the battery cell body 11 can be side-extruded, and the adapter 50 can be roughly L-shaped, thereby facilitating connection with the tab 12 and the pole assembly 20 .

[0123] The end face of the pole ear 12 extending from the battery cell body 11 is perpendicular 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 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 path 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, the current transmission path between the pole ear 12 of the battery cell 10 and the pole assembly 20 is relatively large in internal resistance and generates heat seriously compared to 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. Therefore, it is necessary to increase the maximum dimension L formed by the opposite ends of the second part 22 away from the end face of the battery cell 10 to increase the heat dissipation area of ​​the pole, D×d / L 2 Needs to be smaller.

[0124] 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 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 the conductive bar electrically connected to the adjacent battery, thereby facilitating the connection between the pole assembly 20 and the tab 12 and the conductive bar.

[0125] One of the first metal and the second metal can be a copper block, and the other can be an aluminum block. The copper block and the aluminum block can respectively adapt to connections of different structures. For example, the copper block can be connected to the tab 12, and the aluminum block can be connected to the second part 22.

[0126] 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.

[0127] In one embodiment, the first portion 21 may be a unitary structure. For example, the first portion 21 may be aluminum, or the first portion 21 may be copper.

[0128] 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 shell 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 shell 30 can be increased by controlling the above ratio, thereby ensuring structural stability.

[0129] 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.

[0130] 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 shell 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 overcurrent can be ensured by controlling the above ratio, and the generation of stress concentration can be avoided.

[0131] 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.

[0132] 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 second part 22 from being subjected to force and 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.

[0133] In one embodiment, Figure 10 and Figure 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 facing away from the battery cell 10, thereby ensuring the insulation performance between the pole assembly 20 and the battery shell 30 through 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.

[0134] In one embodiment, the first insulating member 41 is provided with an orthographic projection of the end face of the pole assembly 20 along the battery housing 30, and the orthographic projection of the end face of the pole assembly 20 along the battery housing 30 is at least partially overlapped with the orthographic projection 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.

[0135] The orthographic projection of the end face of the pole assembly 20 arranged along the battery shell 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 arranged along the battery shell 30 of the weld mark 23. 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, 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.

[0136] In one embodiment, the orthographic projection of the end face of the pole assembly 20 provided along the battery housing 30 of the first insulating member 41 and the orthographic projection of the end face of the pole assembly 20 provided 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.

[0137] The orthographic projection of the end face of the pole assembly 20 arranged along the battery shell 30 of the first insulating member 41 does not overlap with the orthographic projection of the end face of the pole assembly 20 arranged along the battery shell 30 of the weld mark 23, 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, the first orthographic projection and the second orthographic projection have no overlapping parts, and the first orthographic projection can be surrounded by the outside of the second orthographic projection.

[0138] 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 and the orthographic projection of the end face of the pole assembly 20 of the second portion 22 along the battery housing 30 do not overlap, thereby avoiding the large riveting force during the assembly of the fixing portion 32 causing 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.

[0139] The orthographic projection of the end face of the pole assembly 20 of the fixing portion 32 along the battery shell 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 shell 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 33 of the battery shell 30, and the cover 33 is basically rectangular. The orthographic projections of the fixing portion 32 and the second portion 22 on the cover 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.

[0140] 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 shell 30 and the orthographic projection of the end face of the pole assembly 20 of the second portion 22 is arranged along the battery shell 30 to overlap with each other, thereby improving the overall connection strength between the battery shell 30 and the pole assembly 20, avoiding the risk of detachment when the top surface of the second portion 22 is not limited, and thereby improving the overall safety performance of the battery.

[0141] 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 arranged to overlap 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 33 of the battery housing 30, and the cover 33 is basically rectangular. The orthographic projections of the fixing portion 32 and the second portion 22 on the cover 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.

[0142] It should be noted that the second portion 22 may occupy part of the groove 211, such as Figure 10 Alternatively, the second portion 22 may occupy the entire groove 211, as shown Figure 11 shown.

[0143] It should be noted that a battery comprises a cell and an electrolyte, the smallest unit capable of carrying out electrochemical reactions such as charge and discharge. A cell is formed by winding or laminating a stack of components, which includes a first electrode, a separator, and a second electrode. When the first electrode is a positive electrode, the second electrode is a negative electrode. The polarity of the first and second electrodes can be interchanged. The first and second electrodes are coated with an active material.

[0144] In one embodiment, the battery can be a quadrangular prism battery. The quadrangular prism battery mainly refers to a battery with a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense. The corners between the sides are not necessarily right angles and can be arc transitions.

[0145] The battery can be a laminated battery, which is not only convenient for grouping but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first electrode sheet stacked on top of each other, a second electrode sheet with an opposite electrical property to the first electrode sheet, and a diaphragm sheet disposed between the first and second electrode sheets, so that multiple pairs of first and second electrode sheets are stacked to form a laminated battery cell.

[0146] Alternatively, the battery may be a wound battery, that is, a first electrode sheet, a second electrode sheet having electrical properties opposite to the first electrode sheet, and a diaphragm sheet arranged between the first electrode sheet and the second electrode sheet are wound to obtain a wound battery cell.

[0147] In one embodiment, the battery may be a cylindrical battery, or a hexagonal prism battery. The battery may be a wound battery, that is, a first electrode sheet, a second electrode sheet having an electrical property opposite to that of the first electrode sheet, and a separator sheet disposed between the first electrode sheet and the second electrode sheet are wound to obtain a wound battery cell.

[0148] It should be noted that an extreme thrust test can be performed on the above-mentioned battery to determine whether the battery can meet the safety requirements.

[0149] Test method:

[0150] 1. Install the terminal assembly 20 on the battery housing 30. Further, the terminal assembly 20 can be riveted to the cover plate 33.

[0151] 2. Perform a thrust test on the battery using a D-series electronic universal testing machine (e.g., a DF13.204D / DF13.204T electronic universal testing machine) manufactured by China Machinery Testing Equipment Co., Ltd.

[0152] 3. Fix the cover plate 33 on the thruster;

[0153] 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.

[0154] 5. The maximum thrust is less than 1000N and does not meet the safety requirements for battery use.

[0155]

[0156]

[0157]

[0158] 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 portion 21 away from the battery cell 10 is in mm, the thickness D of the second portion 22 is in mm, and L 2 The unit is mm 2 .

[0159] An embodiment of the present invention further provides a battery pack including the above-mentioned battery.

[0160] The battery of a battery pack of one embodiment of the present invention includes a battery cell 10, a pole assembly 20, and a battery housing 30. The battery cell 10 is disposed in the battery housing 30, and the pole assembly 20 is disposed on the battery housing 30. The pole assembly 20 is electrically connected to the battery cell 10. A groove 211 is provided on the side of the first portion 21 of the pole assembly 20 facing away from the battery cell 10, and the second portion 22 of the pole assembly 20 is disposed in the groove 211. On the basis of ensuring the current flow 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 housing 30 is bent into a connecting section 321 and a pressing section 322, thereby forming a fixed limit for the pole assembly 20 passing through the pole through hole 31, reducing the risk of the pole assembly 20 detaching from the battery housing and improving the safe use performance of the battery. The maximum thickness of the second portion 22 is D, the maximum dimension formed by the two opposite ends of the second portion 22 away from the end surface of the battery cell 10 is L, and 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 overcurrent 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.

[0161] In one embodiment, the battery pack is a battery module or a battery pack.

[0162] The battery module includes a plurality of batteries, and the battery module may further include end plates and side plates, which are used to fix the plurality of batteries.

[0163] It should be noted that multiple batteries can be formed into a battery module and then placed in the battery box. The multiple batteries can be fixed by end plates and side plates. Multiple batteries can be placed directly in the battery box, that is, there is no need to group the multiple batteries. In this case, the end plates and side plates can be removed.

[0164] Those skilled in the art will readily recognize other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and illustrative embodiments are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the appended claims.

[0165] It should be understood that the present disclosure is not limited to the precise structures described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. 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 core (10) is disposed in the battery housing (30), a terminal through hole (31) is provided on the battery housing (30), a fixing portion (32) is provided 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 provided on the battery housing (30); A pole assembly (20), at least a portion of the pole assembly (20) is inserted into the pole through hole (31), the pressing section (322) is pressed onto 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), the pole assembly (20) comprises a first portion (21) and a second portion (22), a groove (211) is provided on a side of the first portion (21) facing 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) on which the pole assembly (20) is provided is D, and the groove (211) has an open end surface (2111); 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 provided on the main body (331); at least a portion of the pole assembly (20) is clamped between the pressing section (322) and the limiting section (332); and 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.

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 wall thickness of the main body (331) is greater than the wall thickness of the limiting section (332).

4. The battery according to claim 1, 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 section (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).

5. The battery according to claim 1, characterized in that At least a portion of the battery housing (30) and the fixing portion (32) form an integral connection structure.

6. The battery according to claim 1, characterized in that The first portion (21) includes a connecting portion (212) and a fixing portion (213), the fixing portion (213) being connected to the circumferential outer end surface of the connecting portion (212), at least a portion of the connecting portion (212) being inserted into the pole through hole (31), at least a portion of the fixing portion (213) being clamped between the pressing section (322) and the battery housing (30), and the groove (211) being provided on the end surface of the connecting portion (212) facing away from the battery cell (10); 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, in a direction perpendicular to the surface of the battery housing (30) on which the pole assembly (20) is provided, the thickness of the bottom wall portion of the groove (211) of the connecting portion (212) is M, and the minimum thickness of the fixing portion (213) is N, 1.5≤M / N≤15.

7. The battery according to claim 1, characterized in that The first part (21) and the second part (22) are welded 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 to 3 mm.

8. The battery according to claim 1, characterized in that 0.5mm≤D≤5mm.

9. 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.

10. 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.

11. 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 larger than the area of ​​the pole through hole (31).

12. The battery according to claim 11, characterized in that The dimension of the pole assembly (20) protruding from one end of the battery cell (10) toward the pole through hole (31) is a, and 0.2 mm ≤ a ≤ 3 mm.

13. The battery according to any one of claims 1 to 12, characterized in that 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, 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 larger 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 larger orthographic projection area along the surface of the battery housing (30), and at least a portion of the second portion (22) is located within the first section (2112) to shield the second section (2113); Wherein, the second section (2113) is arranged closer to the battery core (10) than the first section (2112).

14. The battery according to claim 13, characterized in that The end surface of the second portion (22) away from the battery core (10) is flush with the opening end surface (2111).

15. The battery according to claim 13, characterized in that The side wall of the first section (2112) is inclined relative to the bottom wall of the second portion (22), so that the first section (2112) gradually expands from the end connected to the second section (2113) toward the open end surface (2111).

16. The battery according to claim 13, 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°.

17. The battery according to claim 13, 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, 0.5mm≤c≤4mm.

18. The battery according to any one of claims 1 to 12, characterized in that The battery cell (10) comprises a battery cell body (11) and a tab (12), wherein the tab (12) is electrically connected to the pole assembly (20); The battery further comprises a switching plate (50), and the tab (12) is connected to the pole assembly (20) via the switching plate (50).

19. The battery according to claim 18, characterized in that The end surface of the battery cell body (11) leading out the pole tab (12) is parallel to the surface of the battery housing (30) on which the pole assembly (20) is provided.

20. The battery according to claim 19, characterized in that The pole tab (12) is welded to the adapter plate (50), and the pole assembly (20) is welded to the adapter plate (50); A first weld mark formed by welding the adapter plate (50) and the pole tab (12) is staggered with a second weld mark formed by welding the adapter plate (50) and the pole assembly (20).

21. The battery according to claim 18, characterized in that The end surface of the battery cell body (11) leading out the pole tab (12) is perpendicular to the surface of the battery housing (30) on which the pole assembly (20) is provided.

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

23. The battery according to any one of claims 1 to 12, 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 portion (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%.

24. The battery according to any one of claims 1 to 12, 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 portion (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%.

25. The battery according to any one of claims 1 to 12, characterized in that The battery is a quadrangular prism battery.

26. The battery according to any one of claims 1 to 12, characterized in that The second portion (22) protrudes from the first portion (21) and is arranged away from the surface of the battery core (10).

27. The battery according to claim 26, characterized in that The battery further comprises a first insulating member (41), at least a portion of which is arranged on surfaces of the first portion (21) and the second portion (22) facing away from the battery cell (10), and the first portion (21) and the second portion (22) are welded to form a weld mark (23).

28. The battery according to claim 27, characterized in that The orthographic projection of the first insulating member (41) along the battery housing (30) on the end face of the pole assembly (20) is at least partially overlapped with the orthographic projection of the weld mark (23) along the battery housing (30) on the end face of the pole assembly (20).

29. The battery according to claim 27, characterized in that The orthographic projection of the end face of the pole assembly (20) disposed along the battery housing (30) by the first insulating member (41) and the orthographic projection of the end face of the pole assembly (20) disposed along the battery housing (30) do not overlap.

30. The battery according to claim 26, 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) and the orthographic projection of the end face of the pole assembly (20) disposed along the battery housing (30) do not overlap.

31. The battery according to claim 26, 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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