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 the division of application number 202420557064.0, application date 2024.03.21, and invention name battery. TECHNICAL FIELD

[0002] The utility model relates to battery technology field especially relates to a battery. BACKGROUND

[0003] In related technologies, the battery shell can be provided with a pole post assembly, so that the battery cell and the pole post assembly form an electrical connection. Due to the structural form of the pole post assembly, the pole post assembly may have a high cost, or the installation stability of the pole post assembly may be affected, which is not conducive to ensuring the safe use performance of the battery. SUMMARY

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

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

[0006] Battery cell;

[0007] Battery shell, the battery cell is arranged in the battery shell, the battery shell is provided with pole post through hole, the battery shell is provided with fixed part, the fixed part is bent into connecting section and pressure section, the connecting section is arranged on the battery shell;

[0008] Pole post assembly, at least part of the pole post assembly is arranged in the pole post through hole, the pressure section is arranged on the pole post assembly, so that at least part of the pole post assembly is clamped between the pressure section and the battery shell, the pole post assembly is electrically connected with the battery cell, the pole post assembly includes first part and second part, the side of the first part away from the battery cell is provided with recess, at least part of the second part is arranged in the recess, the maximum thickness of the second part along the direction perpendicular to the surface of the battery shell where the pole post assembly is arranged is D, the recess has opening end face, the maximum size formed by the opposite ends of the end face of the second part away from the battery cell is L, the distance between the outer edge of the end face of the second part away from the battery cell and the circumferential outermost end of the first part is d, 0.00002≤D×d / L 2 ≤1.

[0009] The utility model discloses a battery includes electric core, pole post subassembly and battery shell, and electric core sets up in the battery shell, and pole post subassembly sets up on the battery shell, and pole post subassembly is electrically connected with electric core. The first part of pole post subassembly is provided with the recess on the side of electric core, and the second part of pole post subassembly is set up in the recess, on the basis of guaranteeing the overcurrent capacity of pole post subassembly, the overall weight of pole post subassembly can also be adjusted, thereby control the manufacturing cost of pole post subassembly. And the fixed part on the battery shell is bent into the connecting section and the pressing section, thereby can form the fixed limit of the pole post subassembly that is arranged in the pole post through -hole, reduce the risk of pole post subassembly from the battery shell, improve the safe use performance of battery. The maximum thickness of second part is D, the maximum size formed on the opposite ends of the end face of second part away from electric core is L, the distance between the outer edge of the end face of second part away from electric core and the circumferential outermost end of first part is d, 0.00002Dxd / L 2 ≤1, the recess is arranged at the top end of pole post subassembly, the deformation of pole post subassembly is weak, the overall connection strength between the battery shell and pole post subassembly is improved by setting the fixed part on the battery shell, and the above setting avoids that the value of Dxd / L 2 is too small, resulting in that the stress at the top end of pole post subassembly is rapidly transmitted to the fixed part, that is, Dxd is too small, the strength of second part is weak, the deformation risk of battery shell is large, the connection strength of the fixed part to pole post subassembly is reduced, the structural stability between pole post subassembly and battery shell is affected, the risk of easy lapping of the two in the deformation process is large, and the safety risk of battery short circuit is caused, the value of Dxd / L 2 is too large, the overcurrent area of the second part of pole post subassembly is narrow, and the overall thickness of pole post subassembly is large, so that the deformation risk of the fixed part of battery shell caused by the gas production in the battery or the structure deformation in the battery is large. By adjusting the above ratio, the overcurrent capacity of the overall pole post subassembly can be effectively controlled, and the risk of fixed failure of the fixed part is reduced, so that the safe use performance of the battery can be reliably improved. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to better understand the present disclosure, reference can be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements can be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components can have different settings as known in the art. Furthermore, in the drawings, the same reference signs represent the same or similar components throughout the various drawings. Among them:

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

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

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

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

[0015] Figure 5 is a partially cross-sectional structural schematic view of a battery according to a first exemplary embodiment;

[0016] Figure 6 is a partially cross-sectional structural schematic view of a battery according to a second exemplary embodiment;

[0017] Figure 7 is a partially cross-sectional structural schematic view of a battery according to a third exemplary embodiment;

[0018] Figure 8 is a partially cross-sectional structural schematic view of a battery according to a fourth exemplary embodiment;

[0019] Figure 9 is a partially cross-sectional exploded structural schematic view of a battery according to an exemplary embodiment;

[0020] Figure 10 is a partially cross-sectional structural schematic view of a battery according to a fifth exemplary embodiment;

[0021] Figure 11 is a partially cross-sectional structural schematic view of a battery according to a sixth exemplary embodiment.

[0022] The reference signs are explained as follows:

[0023] 10, cell; 11, cell body; 12, tab; 20, post assembly; 21, first portion; 211, groove; 2111, open end surface; 2112, first section; 2113, second section; 212, connecting portion; 213, fixing portion; 214, connecting edge; 22, second portion; 23, weld mark; 30, battery case; 31, post through hole; 32, fixing portion; 321, connecting section; 322, pressing section; 33, cover plate; 331, body; 3311, inner surface; 3312, outer surface; 332, limiting section; 34, case member; 41, first insulating member; 42, second insulating member; 50, adapter tab. DETAILED DESCRIPTION

[0024] The technical solutions in the example embodiments of the present disclosure will be described clearly and completely in the present disclosure with reference to the accompanying drawings. The example embodiments described herein are only for illustrative purposes, and are not intended to limit the protection scope of the present disclosure, so it should be understood that various modifications and changes can be made to the example embodiments without departing from the protection scope of the present disclosure.

[0025] In the description of the present disclosure, unless explicitly specified and limited, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "multiple" refers to two or more than two; the term "and / or" includes any combination and all combinations of one or more associated listed items. In particular, referring to "the" object or "one" object is also intended to represent one of the possible multiple such objects.

[0026] Unless otherwise specified or explained, the terms "connection", "fixation" and the like should be interpreted broadly, for example, "connection" can be fixed connection, or detachable connection, or integral connection, or electrical connection, or signal connection; "connection" can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0027] Further, in the description of the present disclosure, it should be understood that the "up", "down", "inner", "outer" and the like described in the example embodiments of the present disclosure are described with reference to the angle shown in the 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 referring to one element or feature connected to another element (one or more) "on", "below", or "inside", "outside", it can not only be directly connected to another element (one or more) "on", "below", or "inside", "outside", but also indirectly connected to another element (one or more) "on", "below", or "inside", "outside" through an intermediate element.

[0028] One embodiment of the utility model provides a kind of battery, please refer to Figures 1 to 11The battery comprises: a battery cell 10; a battery shell 30, the battery cell 10 is arranged in the battery shell 30, a pole post through hole 31 is arranged on the battery shell 30, a fixing part 32 is arranged on the battery shell 30, the fixing part 32 is bent into a connecting section 321 and a pressing section 322, the connecting section 321 is arranged on the battery shell 30; a pole post assembly 20, at least part of the pole post assembly 20 is arranged in the pole post through hole 31, the pressing section 322 is arranged on the pole post assembly 20, so that at least part of the pole post assembly 20 is clamped between the pressing section 322 and the battery shell 30, the pole post assembly 20 is electrically connected with the battery cell 10, the pole post assembly 20 comprises a first part 21 and a second part 22, a groove 211 is arranged on the side, away from the battery cell 10, of the first part 21, at least part of the second part 22 is arranged in the groove 211, the maximum thickness of the second part 22 along the direction perpendicular to the surface of the battery shell 30 on which the pole post assembly 20 is arranged is D, the groove 211 has an opening end face 2111, the maximum size of the opposite two ends of the end face, away from the battery cell 10, of the second part 22 is L, the distance between the outer edge of the end face, away from the battery cell 10, of the second part 22 and the circumferential outermost end of the first part 21 is d, and 0.00002<=Dxd / L<=1. 2

[0029] The battery of one embodiment of the utility model comprises a battery cell 10, a pole post assembly 20 and a battery shell 30, the battery cell 10 is arranged in the battery shell 30, the pole post assembly 20 is arranged on the battery shell 30, and the pole post assembly 20 is electrically connected with the battery cell 10. The first part 21 of the pole post assembly 20 is provided with a groove 211 on the side, away from the battery cell 10, of the pole post assembly 20, and the second part 22 of the pole post assembly 20 is arranged in the groove 211. On the basis of ensuring the overcurrent capacity of the pole post assembly 20, the overall weight of the pole post assembly 20 can also be adjusted, so as to control the manufacturing cost of the pole post assembly 20. The fixing part 32 on the battery shell 30 is bent into a connecting section 321 and a pressing section 322, so that the fixing and limiting of the pole post assembly 20 arranged in the pole post through hole 31 can be formed, the risk that the pole post assembly 20 is separated from the battery shell is reduced, and the safe use performance of the battery is improved. The maximum thickness of the second part 22 is D, the maximum size of the opposite two ends of the end face, away from the battery cell 10, of the second part 22 is L, the distance between the outer edge of the end face, away from the battery cell 10, of the second part 22 and the circumferential outermost end of the first part 21 is d, and 0.00002<=Dxd / L<=1. Not only can the overcurrent capacity of the pole post assembly 20 as a whole be effectively controlled, but also the risk that the fixing part 32 is fixed invalidly is reduced, so that the safe use performance of the battery can be reliably improved. 2

[0030] It should be noted that, as shown in Figures 1 to 4 , the battery shell 30 can be provided with the pole post assembly 20, and the pole post assembly 20 can be two, and the two pole post assemblies 20 are arranged on the battery shell 30 at intervals.​​

[0031] In combination Figures 5 to 6 As shown, the pole assembly 20 includes a first part 21 and a second part 22, the first part 21 is provided with a groove 211 on the side away from the electrode core 10, and the second part 22 is arranged in the groove 211, so that the weight of the second part 22 can be controlled, thereby reducing the material use of the pole assembly 20, effectively controlling the energy density of the battery, for example, the second part 22 can occupy the space of the groove 211 part. The second part 22 can be considered as a cap, thereby forming a cover for the groove 211 of the first part 21.

[0032] In combination Figure 6 As shown, the maximum thickness of the second part 22 in the direction perpendicular to the surface of the battery shell 30 where the pole assembly 20 is arranged can be represented as D, and the maximum size formed at the opposite ends of the end face of the second part 22 away from the electrode core 10 can be represented as L, for example, the end face of the second part 22 away from the electrode core 10 can be a circular face, and the maximum size L formed at the opposite ends of the end face of the second part 22 away from the electrode core 10 is the diameter of the circular face, or the end face of the second part 22 away from the electrode core 10 can be a rectangular face, and the maximum size L formed at the opposite ends of the end face of the second part 22 away from the electrode core 10 is the length dimension of the rectangular face. The distance between the outer edge of the end face of the second part 22 away from the electrode core 10 and the circumferentially outermost end of the first part 21 can be represented as d, and 0.00002≤D×d / L 2 ≤1, on the basis of effectively controlling the structural strength and 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] The first part 21 is provided with a groove 211 on the side away from the electrode core 10, so that the overall height of the pole assembly 20 can be increased without increasing the overall weight of the pole assembly 20, thereby also reducing the initial plate thickness of the first part 21, for example, the first part 21 is formed by stamping, which not only can reduce the cost, but also can avoid the risk of deformation of the fixing part 32 caused by the overall thickness of the pole assembly 20 being too large. The formation of the groove 211 may cause the distance d between the outer edge of the end face of the second part 22 away from the electrode core 10 and the circumferentially outermost end of the first part 21 to be too small, or the maximum thickness D of the second part 22 to be too thick, thereby increasing the risk of deformation of the stress 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, causing the battery seal to fail, and triggering the battery safety risk. By making 0.00002≤D×d / L 2 ≤1, the above risks can be effectively reduced.

[0034] D×d / L 2Too small, the risk of deformation of the pressing section 322 increases, the pole assembly 20 drives the pressing section 322 to bear force quickly, and the second part 22 is difficult to bear large tension or pressure, the risk of deformation of the pressing section 322 increases, and the connection strength of the first part 21 and the second part 22 of the pole assembly 20 is weak, and the overall overcurrent capacity of the battery is weakened. Dxd / L 2 Too large, the maximum size L formed at the opposite ends of the circumferential outer edge of the open end face 2111 is small, resulting in a large overall thickness of the pole assembly 20, so that the bottom of the pole assembly 20 is squeezed upwardly to press the pressing section 322, causing the risk of deformation of the pressing section 322.

[0035] Dxd / 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] In combination Figures 5 to 6 As shown, the battery shell 30 is provided with a pole through hole 31, and the pole assembly 20 is arranged in the pole through hole 31. The battery shell 30 is provided with a fixing part 32, and the fixing part 32 is arranged around the pole through hole 31. The fixing part 32 is bent into a connecting section 321 and a pressing section 322. The connecting section 321 is arranged on the battery shell 30, and the pressing section 322 is arranged on the pole assembly 20. The pole assembly 20 is clamped between the pressing section 322 and the battery shell 30, thereby effectively preventing the pole assembly 20 from separating from the battery shell 30, and ensuring the safe use of the battery.

[0037] The direction perpendicular to the surface of the battery shell 30 provided with the pole assembly 20 can be considered as the direction perpendicular to the large surface of the battery shell 30 provided with the pole assembly 20. For example, the battery shell 30 includes a cover plate 33, and the pole assembly 20 is arranged on the cover plate 33. At this time, the direction perpendicular to the surface of the battery shell 30 provided with the pole assembly 20 can be considered as the direction perpendicular to the large surface of the cover plate 33.

[0038] In one embodiment, as shown in Figure 1 and Figure 2 The battery shell 30 includes a cover plate 33, and the pole through hole 31 is arranged on the cover plate 33. The fixing part 32 is arranged on the cover plate 33. The arrangement of the cover plate 33 not only facilitates the forming of the fixing part 32, but also facilitates the subsequent installation of the pole assembly 20, thereby improving the manufacturing efficiency of the battery.

[0039] In combination Figure 1As shown in FIG. 1, the battery shell 30 includes a cover plate 33 and a shell piece 34, the cover plate 33 and the shell piece 34 can be connected by welding, the cover plate 33 and the fixed part 32 can be integrally formed, for example, the cover plate 33 and the fixed part 32 can be formed by stamping, rolling and the like.

[0040] In one embodiment, the battery shell 30 includes a cover plate 33 and a shell piece 34, the cover plate 33 and the shell piece 34 are connected, the fixed part 32 is arranged on the shell piece 34, and the fixed part 32 can be arranged on the side of the shell piece 34 opposite to the cover plate 33.

[0041] In one embodiment, as shown in FIG. 1, Figure 6 and Figure 7 As shown in FIG. 1, the battery shell 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 post through hole 31, the fixed part 32 is arranged on the main body 331, and at least part of the pole post assembly 20 is clamped between the pressing section 322 and the limiting section 332, so that the pressing section 322 and the limiting section 332 can form effective fixation of the pole post assembly 20, reduce the risk of disengagement of the pole post assembly 20, and further improve the safe use performance of the battery.

[0042] The fixed part 32 can be arranged on the cover plate 33, and the cover plate 33 can include a main body 331 and a limiting section 332. Alternatively, the fixed part 32 can be arranged on the shell piece 34, and the shell piece 34 can 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, which can not only effectively control the structural strength of the cover plate 33, but also avoid the weight of the cover plate 33 being too large and adversely affecting the control of the energy density of the battery.

[0044] It should be noted that in some embodiments, the wall thickness of the main body 331 can be equal to the wall thickness of the limiting section 332.

[0045] In one embodiment, at least part of the battery shell 30 and the fixed part 32 are integrally connected, which not only facilitates the molding of the battery shell 30 and the fixed part 32, but also ensures the connection strength between the battery shell 30 and the fixed part 32, and further improves the safe use performance of the battery.

[0046] The cover plate 33 of the battery shell 30 can be in an integral connection structure with the fixing portion 32. The cover plate 33 can be in an integral forming type structure with the fixing portion 32. For example, the cover plate 33 with the fixing portion 32 can be formed by stamping, bending, or the like, using a flat plate. The wall thickness of the main body 331 is greater than the wall thickness of the limiting section 332, thereby forming the fixing portion 32 with a certain structural strength, so as to ensure the effective fixing of the fixing portion 32 to the pole assembly 20. Alternatively, the shell member 34 of the battery shell 30 can be in an integral connection structure with 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 formed by flanging and riveting to effectively fix the pole assembly 20, thereby improving the safety and stability of the pole assembly 20.

[0048] The battery shell 30 includes the cover plate 33 and the shell member 34. The cover plate 33 and the shell member 34 can be in a split type structure, or the cover plate 33 and the shell member 34 can be in an integral type structure.

[0049] It should be noted that, in some embodiments, the cover plate 33 and the fixing portion 32 can be in a split type structure. For example, the cover plate 33 and the fixing portion 32 can be welded.

[0050] In one embodiment, as shown in Figure 6 The first part 21 includes a connecting portion 212 and a fixing portion 213. The fixing portion 213 is connected to the circumferential outer end face of the connecting portion 212. At least part of the connecting portion 212 is arranged in the pole through hole 31. At least part of the fixing portion 213 is clamped between the pressing section 322 and the battery shell 30. The end face of the connecting portion 212 away from the battery cell 10 is provided with a groove 211. The groove 211 not only ensures that the first part 21 is fixed to the pressing section 322 and the limiting section 332 through the fixing portion 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] As shown in Figure 8 The circumferential outer surface of the connecting portion 212 and the end face of the fixing portion 213 facing the battery cell 10 form a connecting edge 214. The minimum distance between the connecting edge and the second part 22 is Q, and 0.15≤D / Q≤10. This can ensure that the first part 21 and the second part 22 have reliable connection strength, and can 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 portion 212 and the end surface of the electrode body 10 toward the fixing portion 213, and the minimum distance between the connecting edge and the second portion 22 is Q, that is, it can be considered that the connecting portion 212 is arranged close to the electrode body 10 to form a protruding section, and the minimum distance between the edge of the protruding section and the second portion 22 can be Q.

[0053] In combination Figure 8 As shown, the minimum distance between the connecting edge and the second portion 22 can be represented as Q, and the ratio of the maximum thickness D of the second portion 22 to the minimum distance Q between the connecting edge and the second portion 22 is too small, and the connection strength between the first portion 21 and the second portion 22 is weak. Because the thickness at the corner formed by the first portion 21 and the second portion 22 is too large, that is, the minimum distance Q between the connecting edge and the second portion 22 is too large, the first portion 21 is too strong, which causes the second portion 22 to be easily deformed, affecting the connection strength between the two; and the ratio of the maximum thickness D of the second portion 22 to the minimum distance Q between the connecting edge and the second portion 22 is too large, the second portion 22 is stressed, and the structural strength of the first portion 21 is weak, which causes the corner formed by the first portion 21 and the second portion 22 to be easily sealed from the battery shell 30, and the corner generates a lot of heat, affecting 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, and the like.

[0055] And / or, in the direction perpendicular to the surface of the battery shell 30 on which the pole assembly 20 is arranged, the connecting portion 212 has a thickness of M of the groove 211 bottom wall portion, and the minimum thickness of the fixing portion 213 is N, 1.5≤M / N≤15, which not only can ensure the structural strength of the connecting portion 212, but also can avoid the risk of deformation of the fixing portion 213, thereby improving the safety performance of the battery.

[0056] In combination Figure 6As shown, the thickness of the connecting portion 212 having the groove 211 bottom wall portion can be represented as M, the minimum thickness of the fixed portion 213 can be represented as N, the ratio of the thickness M of the connecting portion 212 having the groove 211 bottom wall portion to the minimum thickness N of the fixed portion 213 is too small, the deformation risk of the bottom of the connecting portion 212 increases, which affects the overall structural strength of the connection between the battery cell 10 and the pole assembly 20, and affects the connection strength between the first portion 21 and the second portion 22. If the connection strength between the pole assembly 20 and the battery shell 30 is weak, the position between the second portion 22 and the first portion 21 is more likely to move after deformation, and the strength is more difficult to guarantee. If the ratio of the thickness M of the connecting portion 212 having the groove 211 bottom wall portion to the minimum thickness N of the fixed portion 213 is too large, the fixed portion 213 arranged between the abutting section 322 and the limiting section 332 has a large deformation risk, which is not conducive to improving the safe use performance of the pole assembly 20.

[0057] The ratio of the thickness M of the connecting portion 212 having the groove 211 bottom wall portion to the minimum thickness N of the fixed 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, and the like.

[0058] In one embodiment, as shown in Figure 6 and Figure 7 As shown, the main body 331 has opposite inner and outer surfaces 3311 and 3312, and the distance between the inner and outer surfaces 3311 and 3312 can be the thickness of the main body 331.

[0059] As shown in combination with Figures 5 to 7 As shown in combination with

[0060] Alternatively, in a direction perpendicular to the outer surface 3312, the vertical distance between the surface of the limiting segment 332 facing the surface of the battery cell 10 and the outer surface 3312 is greater than the vertical distance between the inner surface 3311 and the outer surface 3312, that is, the surface of the limiting segment 332 facing the surface of the battery cell 10 can be below the inner surface 3311, thereby significantly improving the structural strength of the limiting segment 332, and further ensuring the effective fixation of the pressing segment 322 and the limiting segment 332 to the fixed portion 213, and improving the safe use performance of the battery.

[0061] Alternatively, in a direction perpendicular to the outer surface 3312, the vertical distance between the surface of the limiting segment 332 facing the surface of the battery cell 10 and the outer surface 3312 is equal to the vertical distance between the inner surface 3311 and the outer surface 3312, that is, the surface of the limiting segment 332 facing the surface of the battery cell 10 can be flush with the inner surface 3311, which can not only ensure the structural strength of the limiting segment 332, but also avoid occupying a large space of the battery shell 30, which is conducive to controlling the use performance of the battery.

[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 shell 30, but also ensure the heat dissipation capacity of the battery.

[0063] In combination with Figure 7 As shown, in a direction perpendicular to the surface of the battery shell 30 provided with the pole assembly 20, the thickness of the main body 331 can be represented as d1, and the ratio of the thickness d1 of the main body 331 to the maximum thickness D of the second portion 22 is too small, the deformation of the top surface portion of the pole assembly 20 causes the main body 331 to be difficult to bear pressure, which affects the overall connection strength of 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 portion 22 is too large, the top surface end of the pole assembly 20 has a relatively narrow flow area, and the local heat production seriously affects the rapid heat dissipation of the overall battery and the gas production inside the battery cell 10 causes the second portion 22 to deform, which affects the connection strength and stability between the second portion 22 and the first portion 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, which can not only ensure the connection strength between the first portion 21 and the second portion 22, but also control the flow capacity of the first portion 21 and the second portion 22, thereby improving the safe use performance of the battery.

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

[0066] In combination Figure 8 As shown in the figure, the first part 21 and the second part 22 are welded to form a weld 23 at the surface of the first part 21 and the second part 22 away from the battery cell 10, and the fusion width L1 of the weld 23 is 0.2mm-3mm, which not only ensures the connection strength between the first part 21 and the second part 22, but also ensures the overall fast charging rate of the battery.

[0067] In combination Figure 8 As shown in the figure, the fusion width of the weld 23 is the maximum width of the weld 23, and the fusion width of the weld 23 can be represented as L1. If the fusion width L1 of the weld 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 fusion width L1 of the weld 23 is too large, the resistance at the weld 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 fusion width L1 of the weld 23 can be the size of the weld 23 obtained along the direction parallel to the surface of the battery shell 30 where the pole assembly 20 is arranged.

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

[0070] In one embodiment, L1 / L is 0.004-0.6, i.e. the ratio of the fusion width L1 of the weld 23 to the maximum size 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 not only ensures the connection strength between the first part 21 and the second part 22, but also ensures the overall transmission rate of the battery.

[0071] If the ratio of the fusion width L1 of the weld 23 to the maximum size L formed by the opposite ends of the end surface of the second part 22 away from the battery cell 10 is too small, 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 them to be easily broken and affecting the overall current transmission of the battery. If the ratio of the fusion width L1 of the weld 23 to the maximum size L formed by the opposite ends of the end surface of the second part 22 away from the battery cell 10 is too large, the current transmission between the first part 21 and the second part 22 is blocked, and in addition, the second part 22 has a small flow area, which further reduces the overall transmission rate of the battery.

[0072] The ratio of the fusion width L1 of the welding mark 23 to the maximum dimension L formed by the opposite ends of the end surface of the second portion 22 away from the battery cell 10 can be 0.004, 0.005, 0.008, 0.01, 0.014, 0.015, 0.018, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, or 0.6, and the like.

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

[0074] In an embodiment, the thickness of the second portion 22 is D, 0.5mm≤D≤5mm, which can ensure the structural strength of the second portion 22 and also avoid affecting the structural strength of the pressing section 322.

[0075] If the thickness D of the second portion 22 is too large, the second portion 22 is deformed under stress, which causes structural damage to the pressing section 322, and the size of the minimum distance Q between the connecting edge 214 and the second portion 22 becomes smaller, which causes the structural failure of the pole assembly 20 at the connecting edge 214; if the thickness D of the second portion 22 is too small, the connection strength between the second portion 22 and the first portion 21 is weakened, the battery is locally overheated, and the short circuit risk is easily triggered.

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

[0077] In one embodiment, the minimum distance between the open end surface 2111 and the circumferential outer edge of the end surface of the first portion 21 away from the battery cell 10 is d, 0.1mm≤d≤5mm, which not only ensures the structural strength of the first portion 21, but also ensures that the first portion 21 and the second portion 22 can have sufficient connection strength, reducing the damage of the second portion 22 to the first portion 21 under stress.

[0078] The minimum distance d between the open 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, 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 size L formed by the opposite ends of the circumferential outer edge of the open end surface 2111 is 5mm≤L≤50mm, so that the first portion 21 can have a relatively large circumferential size, ensuring the flow capacity of the pole assembly 20, and the connection strength between the first portion 21 and the second portion 22 can also be controlled.

[0080] The maximum dimension L formed at the opposite ends of the circumferential outer edge of the open end face 2111 can be 5 mm, 5.2 mm, 5.4 mm, 5.5 mm, 5.6 mm, 5.8 mm, 6 mm, 6.2 mm, 6.4 mm, 6.5 mm, 6.6 mm, 6.8 mm, 7 mm, 7.2 mm, 7.4 mm, 7.5 mm, 7.6 mm, 7.8 mm, 8 mm, 8.2 mm, 8.4 mm, 8.5 mm, 8.6 mm, 8.8 mm, 9 mm, 9.2 mm, 9.4 mm, 9.5 mm, 9.6 mm, 9.8 mm, 10 mm, 10.2 mm, 10.4 mm, 10.5 mm, 10.6 mm, 10.8 mm, 11 mm, 11.2 mm, 11.4 mm, 11.5 mm, 11.6 mm, 11.8 mm, 12 mm, 12.2 mm, 12.4 mm, 12.5 mm, 12.6 mm, 12.8 mm, 13 mm, 13.2 mm, 13.4 mm, 13.5 mm, 13.6 mm, 13.8 mm, 14 mm, 14.2 mm, 14.5 mm, 14.6 mm, 14.8 mm, 15 mm, 15.2 mm, 15.4 mm, 15.5 mm, 15.8 mm, 16 mm, 16.2 mm, 16.5 mm, 16.8 mm, 17 mm, 17.2 mm, 17.5 mm, 17.8 mm, 18 mm, 18.2 mm, 18.5 mm, 18.8 mm, 19 mm, 19.2 mm, 19.5 mm, 19.8 mm, 20 mm, 20.2 mm, 20.5 mm, 20.8 mm, 21 mm, 21.2 mm, 21.5 mm, 21.8 mm, 22 mm, 22.2 mm, 22.5 mm, 22.8 mm, 23 mm, 23.2 mm, 23.5 mm, 23.8 mm, 24 mm, 24.2 mm, 24.5 mm, 24.8 mm, 25 mm, 25.5 mm, 26 mm, 26.5 mm, 27 mm, 27.5 mm, 28 mm, 28.5 mm, 29 mm, 30 mm, 31 mm, 32 mm, 33 mm, 34 mm, 35 mm, 36 mm, 37 mm, 38 mm, 39 mm, 40 mm, 41 mm, 42 mm, 43 mm, 44 mm, 45 mm, 46 mm, 47 mm, 48 mm, or 50 mm, and the like.

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

[0082] In combination Figure 6As shown, the distance between the second portion 22 and the bottom wall of the groove 211 can be represented as H, and 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 of the second portion 22 and the first portion 21 is weak, the flow area is small, and there is a risk of heating short circuit, etc. 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 pole assembly 20 is large, which causes the pole assembly 20 to have a structural deformation failure problem to the pressing section 322, thereby being not conducive to ensuring the safety performance of the battery.

[0083] 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 can be 0.09, 0.1, 0.2, 0.3, 0.5, 0.8, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, or 50, and the like.

[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 the structural strength of the second portion 22 can be ensured, and the size of the second portion 22 can be avoided to be too large, and the energy density of the battery can be affected.

[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, and the like.

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

[0087] The minimum thickness of the fixed portion 32 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm, etc.

[0088] In one embodiment, the minimum thickness of the fixed portion 32 is 0.3mm-1.5mm, which not only ensures the structural strength of the fixed portion 32, but also avoids the problem that when the thickness of the fixed portion 32 is too large, the local structural strength of the battery shell 30 will be too weak when the battery shell 30 and the fixed portion 32 are formed, which is not conducive to improving the safe use performance of the battery.

[0089] The minimum thickness of the fixed portion 32 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm or 1.5mm, etc.

[0090] In one embodiment, one end of the pole assembly 20 towards the battery cell 10 penetrates the pole through hole 31, and the end surface area of the pole assembly 20 towards the battery cell 10 is not greater than the area of the pole through hole 31, so that when the pole assembly 20 is installed, the bottom end thereof can extend into the pole through hole 31 and penetrate into the inside of the battery shell 30, which not only facilitates electrical connection with the battery cell 10, but also positions 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 towards 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 towards the battery cell 10 can be equal to the area of the pole through hole 31, thereby ensuring that the pole assembly 20 can penetrate the pole through hole 31.

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

[0093] In combination withFigure 7 As shown, the size of the protruding pole hole 31 of the pole assembly 20 towards the one end of the battery cell 10 can be represented as a, and if the size a of the protruding pole hole 31 of the pole assembly 20 towards the one end of the battery cell 10 is too small, the battery cell 10 and the pole assembly 20 are difficult to be electrically connected; if the size a of the protruding pole hole 31 of the pole assembly 20 towards the one end of the battery cell 10 is too large, the overall thickness of the pole assembly 20 is large, the surface distance between the battery cell 10 and the battery shell 30 provided with the pole assembly 20 is large, and the heat inside the battery is difficult to be quickly transferred, and it is not conducive to improve the space utilization of the battery shell 30. The size of the protruding pole hole 31 of the pole assembly 20 towards the one end of the battery cell 10 is a, and the size a of the protruding pole hole 31 of the pole assembly 20 towards the one end of the battery cell 10 can be the size of the protruding pole hole 31 of the pole assembly 20 along the direction of the large surface perpendicular to the end surface of the battery shell 30 provided with the pole assembly 20.

[0094] The size a of the protruding pole hole 31 of the pole assembly 20 towards the 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, as shown, Figures 5 to 7 The battery includes a first insulating piece 41, at least part of the first insulating piece 41 is arranged between the fixed part 32 and the pole assembly 20, thereby forming insulation protection between the fixed part 32 and the pole assembly 20, and also improving the fixing ability of the fixed part 32 to the pole assembly 20.

[0096] The thickness of the first insulating piece 41 is 0.3mm-1mm, which not only can ensure the insulation ability between the fixed part 32 and the pole assembly 20, but also can avoid the thickness of the first insulating piece 41 being too large to affect the overall energy density of the battery, thereby reliably improving the use performance of the battery.

[0097] The thickness of the first insulating piece 41 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm or 1mm, etc.

[0098] In one embodiment, at least part of the first insulation piece 41 is arranged between the pressing section 322 and the pole assembly 20; wherein the maximum distance between the opposite sides of the first insulation piece 41 along the extension direction of the pressing section 322 is b, and 1.5mm≤b≤5mm, which can ensure the insulation distance between the pressing section 322 and the pole assembly 20, and can also ensure the overall heat dissipation and flow capacity of the pole assembly 20, thereby improving the safe use performance of the battery.

[0099] In combination Figure 7 As shown in the drawings, the maximum distance between the opposite sides of the first insulation piece 41 along the extension direction of the pressing section 322 can be represented as b. If the maximum distance between the opposite sides of the first insulation piece 41 is too small, the insulation distance is not enough; if the maximum distance between the opposite sides of the first insulation piece 41 is too large, the overall heat dissipation and flow area of the pole assembly 20 is small, which is not conducive to ensuring the safe use performance of the battery. The maximum distance between the opposite sides of the first insulation piece 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 insulation piece 41 can be a plastic piece, or the first insulation piece 41 can be a rubber piece.

[0101] In one embodiment, as shown in the drawings, Figure 6 and Figure 7 The battery further comprises a second insulation piece 42, at least part of the second insulation piece 42 is located between the battery shell 30 and the pole assembly 20, thereby ensuring the insulation capacity between the battery shell 30 and the pole assembly 20, and forming a sealing protection between the pole assembly 20 and the battery shell 30.

[0102] The second insulation piece 42 can be a sealing ring.

[0103] It should be noted that the first insulation piece 41 and the second insulation piece 42 can be a split structure, or the first insulation piece 41 and the second insulation piece 42 can be an integral structure, for example, the first insulation piece 41 and the second insulation piece 42 can be an integrally formed plastic structure.

[0104] In some embodiments, between the pole assembly 20 and the battery shell 30, between the fixing portion 32 and the pole assembly 20, insulation can be formed by an insulating coating, for example, an insulating coating formed by a ceramic material such as aluminum oxide (Al2O3), zirconium oxide (ZrO2), etc.

[0105] In one embodiment, as shown in Figures 5 to 7 the groove 211 includes a first section 2112 and a second section 2113, the first section 2112 and the second section 2113 communicate 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 first section 2112 away from the end face of the battery cell 10 along the normal projection area of the surface of the battery shell 30 is larger than the outer edge of the bottom wall of the second section 2113 along the normal projection area of the surface of the battery shell 30. At least part of the second part 22 is located in the first section 2112 to shield the second section 2113. Thus, the interior of the pole assembly 20 can be hollow, thereby reducing the overall weight of the pole assembly 20.

[0106] In this way, the second section 2113 is closer to the battery cell 10 than the first section 2112, and the second part 22 can be quickly installed into the first section 2112.

[0107] As shown in Figure 9 the first section 2112 and the second section 2113 communicate 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 part 22 away from the battery cell 10 is flush with the open end face 2111. Thus, the installation of the conductive bar during the grouping of the battery can be facilitated, the risk of interference during the installation of the conductive bar can be reduced, and the grouping efficiency of the battery pack can be improved.

[0109] In one embodiment, the side wall of the first section 2112 is inclined relative to the bottom wall of the second part 22. That is, the first section 2112 gradually expands from the end connected to the second section 2113 toward the open end face 2111. This not only facilitates the installation of the second part 22, but also forms reliable limiting of the second part 22. Thus, the installation efficiency of the battery can be improved.

[0110] In one embodiment, the included angle between the side wall of the first section 2112 and the bottom wall of the second part 22 is 90°-150°. Thus, the installation of the second part 22 can be facilitated and achieved quickly.

[0111] The included 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°, and the like.

[0112] In one embodiment, the distance between the outer edge of the end face of the first section 2112 towards the second section 2113 away from the outer edge of the end face of the battery cell 10 is c, and 0.5mm≤c≤4mm. Not only can reliable limiting and fixing of the second part 22 be formed, but also the overall strength of the pole assembly 20 can be avoided, which is not conducive to improving the overall structural strength of the battery.

[0113] In combination with Figure 7 As shown, the distance between the outer edge of the end face of the first section 2112 towards the second section 2113 away from the outer edge of the end face of the battery cell 10 can be represented as c. If the distance c between the outer edge of the end face of the first section 2112 towards the second section 2113 away from the outer edge of the end face of the battery cell 10 is too small, the second part 22 is difficult to achieve limiting and stable connection. If the distance c between the outer edge of the end face of the first section 2112 towards the second section 2113 away from the outer edge of the end face of the battery cell 10 is too large, the overall strength of the pole assembly 20 is large, which has the 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 towards the second section 2113 away from the outer edge of the end face of 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, and the like.

[0115] It should be noted that the first section 2112 and the second section 2113 are communicated to form a stepped groove, the first section 2112 includes a through hole, and the second section 2113 has a bottom wall, that is, a stepped surface can be formed between the first section 2112 and the second section 2113, and the stepped surface can be considered as the bottom wall of the first section 2112, that is, the first section 2112 can include a through hole and a groove portion. The side wall of the first section 2112 is arranged obliquely relative to the bottom wall of the second part 22, that is, it can be considered that the side wall of the first section 2112 is arranged obliquely relative to the stepped surface; the included angle between the side wall of the first section 2112 and the bottom wall of the second part 22 is 90°-150°, that is, it can be considered that the included angle between the side wall of the first section 2112 and the stepped surface is 90°-150°; the distance between the outer edge of the end face of the first section 2112 facing the outer edge of the end face of the second section 2113 away from the battery cell 10 is c, that is, it can be considered that the width dimension 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 with the pole assembly 20; wherein the battery further includes a adapter sheet 50, and the tab 12 is connected with the pole assembly 20 through the adapter sheet 50. The adapter sheet 50 is arranged to adapt to different positional relationships through the adapter sheet 50, facilitate the connection between the tab 12 and the pole assembly 20, improve the spatial adaptability of the battery, and thus improve the use performance of the battery.

[0117] In one embodiment, the end face of the battery cell body 11 leading out the tab 12 is parallel to the surface of the battery shell 30 provided with the pole assembly 20, and 0.00005≤D×d / L 2 That is, the tab 12 can be extended out from the end face of the battery cell body 11 facing the surface of the battery shell 30 provided with the pole assembly 20, thereby improving the overall space utilization rate in 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] In combination Figure 3 As shown in the figure, the end face of the battery cell body 11 leading out the tab 12 is parallel to the surface of the battery shell 30 provided with the pole assembly 20, that is, the tab 12 of the battery cell 10 is ejected, the pole assembly 20 is directly stressed, the internal impact of the battery cell 10 is large for a long time, the connection strength of the first part 21 and the second part 22 is weak, the thickness of the second part 22 is increased to improve the overall strength of the pole assembly 20, and the stability of the connection structure between the fixed part 32 of the battery shell 30 and the pole assembly 20 is ensured.

[0119] The part of the battery shell 30 provided with the pole assembly 20 can be a cover plate 33, and the end face of the battery cell body 11 leading out the tab 12 can be arranged parallel to the cover plate 33, such as Figure 4 and Figure 5As shown in the figure, the same end of the cell body 11 can lead out two tabs 12, which can be positive and negative tabs respectively.

[0120] In one embodiment, the tab 12 is welded with the adapter plate 50, and the pole assembly 20 is welded with the adapter plate 50; wherein the first welding mark formed by the welding of the adapter plate 50 and the tab 12 is arranged in a staggered manner with the second welding mark formed by the welding of the adapter plate 50 and the pole assembly 20, which can not only ensure the stability of the connection between the tab 12 and the adapter plate 50 and the stability of the connection between the adapter plate 50 and the pole assembly 20, but also avoid the influence of heat on the structural strength of the adapter plate 50 and the tab 12 during the welding process, thereby improving the safe use performance of the battery.

[0121] In one embodiment, the end surface of the tab 12 led out by the cell body 11 is perpendicular to the surface of the battery shell 30 provided with the pole assembly 20, and 0.00002≤D×d / L 2 ≤0.9, which can avoid the influence of stress on the structural strength of the tab 12 through the pole assembly 20, thereby effectively improving the safe use performance of the battery.

[0122] In combination Figure 3 As shown in the figure, the tab 12 on the cell body 11 can be side-out, and the adapter plate 50 can be roughly L-shaped, which can facilitate the connection between the tab 12 and the pole assembly 20.

[0123] The end surface of the tab 12 led out by the cell body 11 is perpendicular to the surface of the battery shell 30 provided with the pole assembly 20, i.e. the tab 12 of the cell 10 is side-out, the top end of the pole assembly 20 is not directly stressed, the bottom surface of the pole assembly has a buffer, and the open end of the cell 10 is the main path for gas diffusion, so the gas is not directly stressed, i.e. the thickness of the second part 22 can be correspondingly small, and the strength of the fixing part 32 of the pole assembly 20 and the battery shell 30 can be ensured, but the current transmission path between the tab 12 of the cell 10 and the pole assembly 20 is larger than the relative arrangement of the surface of the battery shell 30 provided with the pole assembly 20 towards the two tabs 12 of the cell 10 on the same side, the internal resistance is large, and the heat generation is serious, so it is necessary to increase the maximum size L of the opposite two ends of the second part 22 away from the end surface of the cell 10 to increase the heat dissipation area of the pole, and D×d / L 2 needs to be a little 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 cell 10 includes a 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 row electrically connected to the adjacent battery, which can facilitate the connection between the pole assembly 20 and the tab 12 and the conductive row.

[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 be adapted to different structures of connection, for example, the copper block can be connected with the tab 12, and the aluminum block can be connected with the second part 22.

[0126] It should be noted that the tab 12 can include two, one of the two tabs 12 can be made of copper, which can be connected with the copper block, and the second part 22 can be aluminum, which can be connected with the aluminum block.

[0127] In one embodiment, the first part 21 can be an integral structure, for example, the first part 21 can be aluminum, or the first part 21 can be copper.

[0128] In one embodiment, the battery is a lithium iron phosphate battery, and the ratio of the maximum area surrounded by the circumferential outer edge of the second part 22 to the area surrounded by the circumferential outer edge of the surface of the battery shell 30 provided with the pole assembly 20 is ≤ 15%. The lithium iron phosphate battery has relatively weak heat generation, and the connection strength between the pole assembly 20 and the battery shell 30 can be improved by controlling the above ratio, thereby ensuring the structural stability.

[0129] The ratio of the maximum area surrounded by the circumferential outer edge of the second part 22 to the area surrounded by the circumferential outer edge of the surface of the battery shell 30 provided with the pole assembly 20 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 surrounded by the circumferential outer edge of the second part 22 to the area surrounded by the circumferential outer edge of the surface of the battery shell 30 provided with the pole assembly 20 is ≥ 2%. The ternary battery has relatively large overall heat generation and energy density, 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 surrounded by the circumferential outer edge of the second part 22 to the area surrounded by the circumferential outer edge of the surface of the battery shell 30 provided with the pole assembly 20 can be 2%, 3%, 4%, 5%, 8%, 10%, 12%, 13%, 14% or 15%, etc.

[0132] In one embodiment, as shown in Figure 8 The second part 22 protrudes from the surface of the first part 21 away from the battery cell 10, avoiding the stress on the second part 22 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 row.

[0133] In one embodiment, as shown in Figure 10 andFigure 11 As shown, the battery further comprises a first insulating member 41, at least part of the first insulating member 41 is arranged on the surface of the first portion 21 and the second portion 22 away from the battery cell 10, so as to ensure the insulation performance between the pole assembly 20 and the battery shell 30 by the first insulating member 41, and the first portion 21 and the second portion 22 are welded to form a welding mark 23, thereby ensuring the connection strength between the first portion 21 and the second portion 22.

[0134] In an embodiment, the first insulating member 41 is arranged along the battery shell 30 to set the orthographic projection of the end surface of the pole assembly 20 to at least partially coincide with the orthographic projection of the end surface of the pole assembly 20 set by the welding mark 23 along the battery shell 30, the welding 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 portion 32 is increased, thereby improving the safe use performance of the battery.

[0135] The first insulating member 41 is arranged along the battery shell 30 to set the orthographic projection of the end surface of the pole assembly 20 to at least partially coincide with the orthographic projection of the end surface of the pole assembly 20 set by the welding mark 23 along the battery shell 30, for example, the pole assembly 20 is arranged on the cover plate 33 of the battery shell 30, the cover plate 33 is basically rectangular, the orthographic projection of the first insulating member 41 and the welding mark 23 on the cover plate 33 is the first orthographic projection and the second orthographic projection respectively, at this time, the first orthographic projection and the second orthographic projection have a coinciding part, the second orthographic projection can coincide with the first orthographic projection, or part of the second orthographic projection can coincide with the first orthographic projection.

[0136] In an embodiment, the first insulating member 41 is arranged along the battery shell 30 to set the orthographic projection of the end surface of the pole assembly 20 to not coincide with the orthographic projection of the end surface of the pole assembly 20 set by the welding mark 23 along the battery shell 30, the welding mark 23 between the first portion 21 and the second portion 22 is generally a non-smooth plane, 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 first insulating part 41 is arranged along the battery shell 30 such that the end face of the pole assembly 20 does not coincide with the weld mark 23, that is, the first insulating part 41 is considered to be located outside the outermost circumferential edge of the weld mark 23, and further, the vertical distance between the innermost circumferential edge of the first insulating part 41 and the center line of the pole assembly 20 is not less than the vertical distance between the outermost circumferential 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, the cover plate 33 is substantially rectangular, the end face of the pole assembly 20 does not coincide with the weld mark 23 on the cover plate 33, and the first insulating part 41 and the weld mark 23 are arranged on the cover plate 33. The first insulating part 41 and the weld mark 23 are respectively projected onto the first projection and the second projection, and the first projection and the second projection do not coincide, and the first projection can be arranged outside the second projection.

[0138] In one embodiment, the fixed part 32 is arranged along the battery shell 30 such that the end face of the pole assembly 20 does not coincide with the second part 22, thereby avoiding the riveting force during assembly of the fixed part 32 from causing the connection between the first part 21 and the second part 22 to fail, thereby ensuring the stability of the connection between the first part 21 and the second part 22, and thereby improving the safe use performance of the battery.

[0139] The fixed part 32 is arranged along the battery shell 30 such that the end face of the pole assembly 20 does not coincide with the second part 22, that is, the fixed part 32 is considered to be located outside the outermost circumferential edge of the second part 22, and further, the vertical distance between the innermost circumferential edge of the fixed part 32 and the center line of the pole assembly 20 is not less than the vertical distance between the outermost circumferential edge of the second part 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, the cover plate 33 is substantially rectangular, the fixed part 32 and the second part 22 are arranged on the cover plate 33. The end face of the pole assembly 20 does not coincide with the weld mark 23, and the third projection and the fourth projection do not coincide, and the third projection can be arranged outside the fourth projection.

[0140] In one embodiment, the fixed part 32 is arranged along the battery shell 30 such that the end face of the pole assembly 20 does not coincide with the second part 22, thereby improving the overall connection strength between the battery shell 30 and the pole assembly 20, avoiding the risk of the top surface of the second part 22 being disengaged without being limited, and thereby improving the overall safety performance of the battery.

[0141] In one embodiment, the fixed portion 32 is arranged along the battery case 30 such that the orthographic projection of the end surface of the pole post assembly 20 coincides with the orthographic projection of the end surface of the pole post assembly 20 arranged along the second portion 22. For example, the pole post assembly 20 is arranged on a cover plate 33 of the battery case 30, the cover plate 33 is substantially rectangular, and the orthographic projections of the fixed portion 32 and the second portion 22 on the cover plate 33 are a third orthographic projection and a fourth orthographic projection, respectively. In this case, the third orthographic projection can be entirely within the fourth orthographic projection, or part of the third orthographic projection can be within the fourth orthographic projection.

[0142] It should be noted that the second portion 22 can occupy part of the groove 211, as shown in FIG. 2B; or the second portion 22 can occupy the entire groove 211, as shown in FIG. 2C. Figure 10 Figure 11

[0143] It should be noted that the battery includes an electrode and an electrolyte, and is a minimum unit capable of electrochemical reactions such as charging / discharging. The electrode refers to a unit formed by winding or laminating a stack portion including a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarity of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0144] In one embodiment, the battery can be a quadrangular prism type battery. The quadrangular prism type battery mainly refers to a prism shape, but is not strictly limited to whether each side of the prism is a straight line in the strict sense, and the corners between the sides can be rounded.

[0145] The battery can be a stacked battery, which is not only convenient to group, but also can be processed to obtain a battery with a relatively long length. Specifically, the electrode is a stacked electrode, and the electrode has a first pole sheet, a second pole sheet opposite in electrical property to the first pole sheet, and a separator disposed between the first pole sheet and the second pole sheet, so that a plurality of pairs of the first pole sheet and the second pole sheet are stacked to form the stacked electrode.

[0146] Alternatively, the battery can be a wound battery, i.e., the first pole sheet, the second pole sheet opposite in electrical property to the first pole sheet, and the separator disposed between the first pole sheet and the second pole sheet are wound to obtain a wound electrode.

[0147] In one embodiment, the battery can be a cylindrical battery, or the battery can be a hexagonal prism type battery. The battery can be a wound battery, i.e., the first pole sheet, the second pole sheet opposite in electrical property to the first pole sheet, and the separator disposed between the first pole sheet and the second pole sheet are wound to obtain a wound electrode.

[0148] It should be noted that the above battery can be subjected to a limit thrust test to determine whether the battery can meet the safety requirements for use.​​

[0149] Test method:

[0150] 1. Install the pole assembly 20 on the battery shell 30, and further, the pole assembly 20 can be riveted on the cover plate 33.

[0151] 2. Perform a thrust test on the above battery by using a D series electronic universal testing machine of Zhongji Testing Equipment Co., Ltd. (for example, an electronic universal testing machine with a specification of DF13.204D / DF13.204T can be selected).

[0152] 3. Fix the cover plate 33 on the thrust machine.

[0153] 4. Use the thrust machine to apply a 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. If the limit thrust is less than 1000N, the battery does not meet the safety requirement for use.

[0155]

[0156]

[0157]

[0158] In the above table, the minimum distance d between the open end surface 2111 and the circumferential outer edge of the end surface of the first part 21 away from the battery cell 10 is in mm, the thickness D of the second part 22 is in mm, and L 2 is in mm 2 .

[0159] An embodiment of the utility model also provides a battery pack comprising the above battery.

[0160] The battery of one embodiment of the utility model discloses a battery pack includes electric core 10, pole post subassembly 20 and battery case 30, electric core 10 sets up in battery case 30, pole post subassembly 20 sets up on battery case 30, and pole post subassembly 20 is electrically connected with electric core 10. The first part 21 of pole post subassembly 20 is provided with groove 211 on the side away from electric core 10, and the second part 22 of pole post subassembly 20 is arranged in groove 211, which can adjust the overall weight of pole post subassembly 20 on the basis of ensuring the overcurrent capacity of pole post subassembly 20, thereby controlling the manufacturing cost of pole post subassembly 20. And the fixed part 32 on the battery case 30 is bent into a connecting section 321 and a pressing section 322, so that the fixed limiting of the pole post subassembly 20 passing through the pole post through hole 31 can be formed, the risk of the pole post subassembly 20 separating from the battery case is reduced, and the safe use performance of the battery is improved. The maximum thickness of the second part 22 is D, the maximum size formed at the opposite ends of the end surface of the second part 22 away from the electric core 10 is L, and the distance between the outer edge of the end surface of the second part 22 away from the electric core 10 and the circumferential outermost end of the first part 21 is d, 0.00002≤D×d / L 2 ≤1, not only can effectively control the overcurrent capacity of the pole post subassembly 20 as a whole, but also reduce the risk of fixed part 32 fixed failure, 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 can further include an end plate and a side plate for fixing the plurality of batteries.

[0163] It should be noted that the plurality of batteries can be arranged in the battery box after forming the battery module, and the plurality of batteries can be fixed by the end plate and the side plate. The plurality of batteries can be directly arranged in the battery box, i.e., without grouping the plurality of batteries, at this time, the end plate and the side plate can be removed.

[0164] Other embodiments of the present disclosure will be apparent to those skilled in the art upon consideration of the specification and practice of the utility model creations disclosed herein. The present disclosure is intended to cover any variations, uses, or adaptations of the utility model that follow the general principles of the present disclosure and include common general knowledge or custom in the art not specifically disclosed. The specification and example embodiments are only considered exemplary, and the true scope and spirit of the present disclosure are 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 various modifications and changes can be made without departing from its scope. The scope of protection of the present disclosure is only limited by the appended claims.

Claims

1. A battery, characterized by, The battery includes: an electric core (10); a battery shell (30), the electric core (10) is arranged in the battery shell (30), a pole post through hole (31) is arranged on the battery shell (30), a fixing part (32) is arranged on the battery shell (30), the fixing part (32) is bent into a connecting section (321) and a pressing section (322), the connecting section (321) is arranged on the battery shell (30); a pole post assembly (20), at least part of the pole post assembly (20) is arranged in the pole post through hole (31), the pressing section (322) is arranged on the pole post assembly (20), so that at least part of the pole post assembly (20) is clamped between the pressing section (322) and the battery shell (30), the pole post assembly (20) is electrically connected with the electric core (10), the pole post assembly (20) includes a first part (21) and a second part (22), a recess (211) is arranged on the side of the first part (21) away from the electric core (10), at least part of the second part (22) is arranged in the recess (211), the maximum thickness of the second part (22) along the direction perpendicular to the surface of the battery shell (30) on which the pole post assembly (20) is arranged is D, the recess (211) has an open end face (2111); the distance between the second part (22) and the bottom wall of the recess (211) is H, 0.09≤D / H≤50, 0.1mm≤H≤6mm.

2. The battery of claim 1, wherein, 0.5mm≤D≤5mm.

3. The battery according to claim 1 or 2, characterized in that, the recess (211) includes a first section (2112) and a second section (2113), the first section (2112) and the second section (2113) are communicated to form a stepped recess, 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) away from the electric core (10) along the normal projection area of the surface of the battery shell (30) is larger than the outer edge of the bottom wall of the second section (2113) along the normal projection area of the surface of the battery shell (30), at least part of the second part (22) is located in the first section (2112) to shield the second section (2113); wherein, the second section (2113) is arranged closer to the electric core (10) than the first section (2112).

4. The battery of claim 3, wherein, the end face of the second part (22) away from the electric core (10) is flush with the open end face (2111).

5. The battery of claim 3, wherein, the side wall of the first section (2112) is arranged inclined to the bottom wall of the second part (22), so that the first section (2112) gradually expands from the end connected with the second section (2113) to the open end face (2111).

6. The battery of claim 3, wherein, the included angle between the side wall of the first section (2112) and the bottom wall of the second part (22) is 90°-150°.

7. The battery of claim 3, wherein, A distance between an outer edge of the first section (2112) toward an end face of the battery cell (10) and an outer edge of the second section (2113) away from the end face of the battery cell (10) is c, and 0.5mm≤c≤4mm.

8. The battery according to claim 1 or 2, characterized by The first part (21) is a composite structure, the first part (21) comprises a first metal and a second metal, the battery cell (10) comprises a battery cell body (11) and a tab (12), the first metal is of the same material as the tab (12), and the second metal is of the same material as a conductive row adjacent to the battery in electrical connection.

9. The battery according to claim 1 or 2, characterized by The battery is a lithium iron phosphate battery, and a ratio of a maximum area surrounded by a circumferential outer edge of the second part (22) to an area surrounded by a circumferential outer edge of a surface of a battery shell (30) provided with the pole assembly (20) is ≤15%.

10. The battery according to claim 1 or 2, characterized by The battery is a ternary battery, and a ratio of a maximum area surrounded by a circumferential outer edge of the second part (22) to an area surrounded by a circumferential outer edge of a surface of a battery shell (30) provided with the pole assembly (20) is ≥2%.

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