Battery

Abstract

The utility model relates to the technical field of batteries, and provides a battery, which comprises a battery shell provided with a pole through hole; the battery cell is arranged in the battery shell; the battery core is electrically connected with the pole assembly, and the pole assembly is fixed on the battery shell by the first bending section and the second bending section; the plugging piece is arranged in the groove, and the plugging piece is connected with the pole assembly in a welding manner, so that a welding mark is formed on one side, deviating from the battery cell, of the plugging piece and / or the pole assembly; at least part of the insulating part is arranged between the pole assembly and the battery shell, the minimum vertical distance between the welding mark and the circumferential outer surface, facing the hole wall of the pole through hole, of the penetrating section is d, and d is larger than or equal to 0, so that the transfer distance of heat on the penetrating section in the welding process can be increased, the probability that the heat is transferred to the insulating part is reduced, and the welding quality of the battery is improved. Therefore, the insulating property and the sealing capability of the insulating part are ensured, and the safe use performance of the battery is improved.

Description

Technical Field

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

[0002] In the related art, a battery may include a battery housing, a battery cell and a pole assembly, wherein the battery cell is disposed in the battery housing and the pole assembly is disposed 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 safety performance of the battery during assembly may be affected. Utility Model Content

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

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

[0005] A battery housing, wherein a terminal through hole is provided on the battery housing;

[0006] A battery cell, wherein the battery cell is arranged in a battery casing;

[0007] A pole assembly, the pole assembly is arranged in the pole through hole, the battery cell is electrically connected to the pole assembly, the pole assembly has a penetration section at least partially penetrated in the pole through hole, the penetration section is provided with a first bending section on the outer side of the battery shell away from the battery cell, the penetration section is provided with a second bending section on the inner side of the battery shell close to the battery cell, the first bending section and the second bending section fix the pole assembly to the battery shell, and a groove is formed on the side of the pole assembly away from the battery cell;

[0008] A plugging member, at least a portion of which is disposed in the groove, and the plugging member is welded to the pole assembly, so that a welding mark is formed on the side of the plugging member and / or the pole assembly facing away from the battery cell;

[0009] An insulating member, at least part of which is arranged between the pole assembly and the battery housing, and along the direction parallel to the plane where the opening of the pole through hole is located, the minimum vertical distance between the weld mark and the circumferential outer surface of the hole wall of the penetration section facing the pole through hole is d, d≥0.

[0010] The battery of the utility model embodiment includes a battery shell, a battery cell, a pole assembly, a plugging member and an insulating member, the battery cell is arranged in the battery shell, the pole assembly is arranged on the battery shell, the plugging member is arranged on the pole assembly, and the insulating member is arranged between the pole assembly and the battery shell. The penetration section is penetrated in the pole through hole, the first bending section and the second bending section are respectively located on the outer side of the battery shell away from the battery cell and the inner side close to the battery cell, so as to ensure that the pole assembly is stably installed on the battery shell, and improve the safety performance of the pole assembly, and the plugging member is arranged in the groove of the pole assembly and is welded to the pole assembly, which can not only ensure the connection stability between the plugging member and the pole assembly, but also ensure the current capacity of the pole assembly, thereby improving the safety performance of the battery. The insulating member realizes insulation protection between the pole assembly and the battery shell, and along the direction parallel to the plane where the hole opening of the pole through hole is located, the minimum vertical distance d≥0 between the weld mark and the circumferential outer surface of the hole wall of the penetration section facing the pole through hole can increase the heat transfer distance on the penetration section during welding, thereby reducing the probability of heat transfer to the insulating member, avoiding thermal deformation of the insulating member, and then ensuring the insulation performance and sealing ability of the insulating member, thereby improving the safe use performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:

[0012] Figure 1 is a schematic structural diagram of a battery according to an exemplary embodiment;

[0013] Figure 2 is a schematic structural diagram of a battery according to another exemplary embodiment;

[0014] Figure 3 is a schematic diagram of a partial cross-sectional structure of a battery according to a first exemplary embodiment;

[0015] Figure 4 is a schematic diagram of a partial cross-sectional structure of a battery according to a second exemplary embodiment;

[0016] Figure 5 is a schematic diagram of a partial cross-sectional structure of a battery according to a third exemplary embodiment;

[0017] Figure 6is a schematic diagram of a partial cross-sectional structure of a battery according to a fourth exemplary embodiment.

[0018] The following are the descriptions of the reference numerals:

[0019] 10. Battery case; 11. Pole through hole; 20. Battery cell; 30. Pole assembly; 31. First bending section; 311. Welding mark; 32. Penetration section; 33. Second bending section; 34. Groove; 341. First section; 342. Second section; 40. Sealing member; 41. Bottom wall; 42. Side wall; 43. First part; 44. Second part; 50. Insulating member; 51. First part; 52. Second part. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.

[0021] In the description of the present disclosure, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or more; the term "and / or" includes any and all combinations of one or more associated listed items. In particular, reference to "the / the" object or "an" object is also intended to indicate one of a possible plurality of such objects.

[0022] Unless otherwise specified or explained, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, an electrical connection, or a signal connection; "connection" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in this disclosure can be understood according to specific circumstances.

[0023] Further, in the description of the present disclosure, it should be understood that the directional words such as "upper", "lower", "inner", "outer" and the like described in the exemplary embodiments of the present disclosure are described at the angles shown in the accompanying drawings and should not be understood as limitations on the exemplary embodiments of the present disclosure. It should also be understood that, in the context, when it is mentioned that an element or feature is connected to another element (one or more) "upper", "lower", or "inner", "outer", it can not only be directly connected to the other (one or more) elements "upper", "lower", "inner", "outer", but also can be indirectly connected to the other (one or more) elements "upper", "lower", "inner", "outer" through an intermediate element.

[0024] An embodiment of the present invention provides a battery. Figures 1 to 6 The battery comprises: a battery shell 10, on which a pole through hole 11 is provided; a battery cell 20, which is provided in the battery shell 10; a pole assembly 30, which is provided in the pole through hole 11, and the battery cell 20 is electrically connected to the pole assembly 30, and the pole assembly 30 has a penetration section 32 which is at least partially penetrated in the pole through hole 11, and the penetration section 32 is provided with a first bending section 31 on the outer side of the battery shell 10 away from the battery cell 20, and the penetration section 32 is provided with a second bending section 33 on the inner side of the battery shell 10 close to the battery cell 20, and the first bending section 31 and the second bending section 33 fix the pole assembly 30 to The battery case 10 has a groove 34 formed on the side of the pole assembly 30 facing away from the battery cell 20; the sealing member 40, at least a portion of the sealing member 40 is disposed in the groove 34, and the sealing member 40 is welded to the pole assembly 30 to form a weld mark 311 on the sealing member 40 and / or the side of the pole assembly 30 facing away from the battery cell 20; the insulating member 50, at least a portion of the insulating member 50 is disposed between the pole assembly 30 and the battery case 10, and along a direction parallel to the plane where the opening of the pole through hole 11 is located, the minimum vertical distance between the weld mark 311 and the circumferential outer surface of the hole wall of the penetration section 32 facing the pole through hole 11 is d, and d≥0.

[0025] A battery of one embodiment of the utility model comprises a battery housing 10, a battery cell 20, a pole assembly 30, a plugging member 40 and an insulating member 50, wherein the battery cell 20 is arranged in the battery housing 10, the pole assembly 30 is arranged on the battery housing 10, the plugging member 40 is arranged on the pole assembly 30, and the insulating member 50 is arranged between the pole assembly 30 and the battery housing 10. The penetration section 32 is penetrated in the pole through hole 11, the first bending section 31 and the second bending section 33 are respectively located on the outer side of the battery housing 10 away from the battery cell 20 and the inner side close to the battery cell 20, so that the pole assembly 30 can be stably installed on the battery housing 10, and the safety performance of the pole assembly 30 can be improved, and the plugging member 40 is arranged in the groove 34 of the pole assembly 30 and is welded to the pole assembly 30, which can not only ensure the connection stability between the plugging member 40 and the pole assembly 30, but also ensure the current capacity of the pole assembly 30, thereby improving the safety performance of the battery. The insulating member 50 realizes insulation protection between the pole assembly 30 and the battery housing 10, and along the direction parallel to the plane where the opening of the pole through hole 11 is located, the minimum vertical distance d≥0 between the weld mark 311 and the circumferential outer surface of the hole wall of the penetration section 32 facing the pole through hole 11 can increase the heat transfer distance on the penetration section 32 during welding, thereby reducing the probability of heat transfer to the insulating member 50, avoiding the insulating member 50 from being deformed by heat, and then ensuring the insulation performance and sealing ability of the insulating member 50, thereby improving the safe use performance of the battery.

[0026] It should be noted that, combined with Figure 1 and Figure 2 As shown, the battery includes a battery housing 10 and a pole assembly 30 , and the pole assembly 30 is disposed on the battery housing 10 .

[0027] Combination Figure 3 and Figure 4 As shown, the battery cell 20 is disposed in the battery housing 10 , and the battery cell 20 can be electrically connected to the pole assembly 30 .

[0028] like Figure 3 , Figure 5 as well as Figure 6 As shown, a pole through hole 11 is provided on the battery housing 10, and the pole assembly 30 is arranged in the pole through hole 11, so that the pole assembly 30 can be conveniently electrically connected to the battery cell 20. For example, the pole assembly 30 can be directly welded to the pole ear of the battery cell 20, or the pole assembly 30 can be electrically connected to the pole ear of the battery cell 20 through an adapter.

[0029] Combination Figures 3 to 6 As shown, the pole assembly 30 has a penetration section 32 that is at least partially penetrated into the pole through hole 11, and the penetration section 32 is provided with a first bending section 31 on the outer side of the battery shell 10 away from the battery cell 20, and the penetration section 32 is provided with a second bending section 33 on the inner side of the battery shell 10 close to the battery cell 20, that is, the pole assembly 30 may include a first bending section 31, a penetration section 32 and a second bending section 33, the penetration section 32 connects the first bending section 31 and the second bending section 33, the penetration section 32 is penetrated in the pole through hole 11, and the first bending section 31 and the second bending section 33 are respectively located on the outer side of the battery shell 10 away from the battery cell 20 and the inner side close to the battery cell 20, so that the first bending section 31 and the second bending section 33 can form a clamp on the battery shell 10, thereby ensuring that the pole assembly 30 is stably fixed on the battery shell 10. The first bending section 31 may be formed by a riveting process, for example, by a flanging riveting process, so that the first bending section 31 and the second bending section 33 clamp the battery housing 10 and further fix the pole assembly 30 .

[0030] The first bending section 31 can be a structure formed by flanging after the pole assembly 30 is installed on the battery housing 10 , thereby ensuring that the first bending section 31 and the second bending section 33 are fixed on the battery housing 10 , thereby forming a reliable fixation of the pole assembly 30 .

[0031] Combination Figures 3 to 6As shown, a groove 34 is formed on the side of the pole assembly 30 away from the battery cell 20, and the first bent section 31 is arranged around the groove 34. The arrangement of the groove 34 can form the first bent section 31 by flanging after the pole assembly 30 is installed on the battery housing 10, so that the first bent section 31 and the second bent section 33 can clamp the battery housing 10, thereby achieving installation and fixation of the pole assembly 30. The forming method of the first bent section 31 may include rotary riveting, stamping riveting, roller riveting, etc., which is not limited here. The first bent section 31 and the second bent section 33 are used to clamp and fix the battery housing 10.

[0032] The plugging member 40 is disposed in the groove 34, and the plugging member 40 is welded to the pole assembly 30, so that a welding mark 311 is formed on the side of the plugging member 40 and / or the pole assembly 30 away from the battery cell 20, such as Figure 3 As shown, the connection stability between the plugging member 40 and the pole assembly 30 can be ensured, and the plugging member 40 can increase the current carrying capacity of the pole assembly 30, and can also facilitate the electrical connection between the pole assembly 30 and the busbar when the batteries are grouped.

[0033] like Figures 3 to 6 As shown, an insulating member 50 is provided between the pole assembly 30 and the battery housing 10. The insulating member 50 can not only ensure insulation protection between the pole assembly 30 and the battery housing 10, but also play a sealing role. The insulating member 50 can further form support for the pole assembly 30, thereby reducing damage to the battery housing 10.

[0034] like Figure 3 As shown, along the direction parallel to the plane where the hole opening of the pole through hole 11 is located, the minimum vertical distance between the weld mark 311 and the circumferential outer surface of the hole wall of the penetration section 32 facing the pole through hole 11 can be expressed as d. The welding heat when the plugging member 40 and the pole assembly 30 are welded will be transferred from the penetration section 32 to the insulating member 50. If the distance is too short, the insulating member 50 will be heated too much, which will cause the insulation and sealing reliability to decrease in the later stage, and even the insulating member 50 will be deformed by heat during welding, causing sealing failure and electrolyte leakage. If the distance is too long, the pole assembly 30 will be too large, which is not conducive to improving the energy density of the battery.

[0035] The minimum vertical distance d between the weld mark 311 and the circumferential outer surface of the hole wall of the penetration section 32 facing the pole through hole 11 can be 0, 0.1mm, 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, 3mm, 3.2mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.5mm, 5mm or 6mm, etc.

[0036] In one embodiment, at least a portion of the insulating member 50 is located within the pole through hole 11, so that at least a portion of the insulating member 50 is located between the battery housing 10 and the penetration section 32, thereby effectively forming insulation protection between the battery housing 10 and the penetration section 32, and also reducing the probability of damage to the battery housing 10 by the penetration section 32.

[0037] In one embodiment, the insulating member 50 includes a sealing portion, at least part of which is located between the battery housing 10 and the first bending section 31. On the basis of ensuring that the sealing portion reliably seals the battery housing 10 and the first bending section 31, the probability of damage to the sealing portion during the welding process between the sealing member 40 and the pole assembly 30 can also be reduced, thereby avoiding the risk of sealing failure.

[0038] In one embodiment, the insulating member 50 includes a sealing portion, at least part of which is located between the battery housing 10 and the second bending section 33. On the basis of ensuring that the sealing portion reliably seals the battery housing 10 and the second bending section 33, the probability of damage to the sealing portion during the welding process between the sealing member 40 and the pole assembly 30 can also be reduced, thereby avoiding the risk of sealing failure.

[0039] In one embodiment, the melting temperature of the insulating member 50 is 120° C.-400° C., thereby reducing the probability of heat damage to the insulating member 50 during the welding process of the sealing member 40 and the pole assembly 30 , thereby improving the safe use performance of the battery.

[0040] The melting temperature of the insulating member 50 may be 120°C, 125°C, 130°C, 135°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, 220°C, 240°C, 250°C, 260°C, 270°C, 280°C, 290°C, 300°C, 320°C, 340°C, 350°C, 360°C, 370°C, 380°C, 390°C or 400°C, etc.

[0041] In one embodiment, the insulating member 50 includes a supporting portion, which is located between the battery housing 10 and the first bending section 31. The Rockwell hardness of the supporting portion is 45-150, thereby ensuring that the supporting portion can form a reliable support for the first bending section 31 and reducing the risk of damage to the insulating member 50 in the process of forming the first bending section 31, thereby improving the insulating member 50's ability to protect the battery, avoiding the risk of structural damage, and further improving the battery's safe use performance.

[0042] The Rockwell hardness of the support portion may be 45, 48, 50, 52, 55, 58, 60, 65, 70, 75, 80, 85, 90, 95, 100, 105, 110, 115, 120, 125, 130, 135, 140, 145 or 150, etc.

[0043] It should be noted that the insulating member 50 may be a whole, for example, the insulating member 50 may be an integrally formed plastic member, or the insulating member 50 may be an integrally formed rubber member; or the insulating member 50 may be a split structure, for example, the insulating member 50 may include at least two parts, for example, a combination of Figure 6 As shown, the first part 51 can be arranged between the first bending section 31 and the battery housing 10, and between the penetration section 32 and the battery housing 10, and the second part 52 can be arranged between the second bending section 33 and the battery housing 10, and the second part 52 can be a sealing ring.

[0044] In one embodiment, along the direction parallel to the plane where the opening of the pole through hole 11 is located, the maximum thickness a of the penetration section 32 is 1mm-4mm, which can not only ensure the thermal insulation capacity of the penetration section 32 and reduce the probability of heat transfer to the insulating member 50, but also ensure that the pole assembly 30 is reduced in weight, thereby controlling the energy density of the battery.

[0045] Combination Figure 6 As shown, along the direction parallel to the plane where the hole of the pole through hole 11 is located, the maximum thickness of the penetration section 32 can be expressed as a. The penetration section 32 can absorb and conduct part of the welding heat. If the maximum thickness of the penetration section 32 is too large, it is not conducive to weight reduction. If the maximum thickness of the penetration section 32 is too small, it is not conducive to reducing the heat transferred to the insulating member 50, and may cause damage to the insulating member 50. The penetration section 32 can be a uniform thickness structure. For example, along the direction perpendicular to the plane where the hole of the pole through hole 11 is located, the extension direction of the side wall of the groove 34 can be perpendicular to the plane where the hole of the pole through hole 11 is located; or, the penetration section 32 can be a non-uniform thickness structure. For example, along the direction perpendicular to the plane where the hole of the pole through hole 11 is located, the extension direction of the side wall of the groove 34 can be inclined relative to the central axis of the pole through hole 11.

[0046] The maximum thickness a of the penetration section 32 may be 1 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, 3.2 mm, 3.5 mm, 3.8 mm or 4 mm, etc.

[0047] In one embodiment, the sealing member 40 is butt-welded to the first bent section 31, and the thickness c of the first bent section 31 in the direction perpendicular to the plane where the opening of the pole through hole 11 is located is 0.3 mm-2 mm, thereby ensuring that the thickness c of the first bent section 31 is relatively large, thereby absorbing more heat, reducing the probability of heat transfer to the insulating member 50, and thereby reducing the probability of heat damage to the insulating member 50.

[0048] The blocking piece 40 is connected to the first bending section 31 by butt welding, which can be considered as welding along the circumferential outer surface of the blocking piece 40 and the circumferential inner surface of the first bending section 31 toward the blocking piece 40, thereby ensuring a reliable connection between the blocking piece 40 and the first bending section 31. The blocking piece 40 and the first bending section 31 can be connected by laser welding.

[0049] Combination Figure 6 As shown, along the direction perpendicular to the plane where the opening of the pole through hole 11 is located, the thickness of the first bent section 31 can be expressed as c. The thickness c of the first bent section 31 can be 0.3mm, 0.5mm, 0.7mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm or 2mm, etc. The first bent section 31 can be a constant thickness structure, or the first bent section 31 can be a variable thickness structure. In one embodiment, along the direction perpendicular to the plane where the opening of the pole through hole 11 is located, the thickness e of the blocking member 40 is ≥ 0.5mm, which can not only ensure the structural strength of the blocking member 40, but also enable the blocking member 40 to have a certain heat absorption capacity, thereby reducing the probability of heat transfer to the insulating member 50.

[0050] The blocking member 40 can be welded to the pole assembly 30 , and when the batteries are grouped, the blocking member 40 can be welded to the busbar, thereby effectively ensuring the structural strength and heat absorption capacity of the blocking member 40 by controlling the thickness of the blocking member 40 .

[0051] Combination Figure 3 As shown, along the direction perpendicular to the plane where the opening of the pole through hole 11 is located, the thickness of the blocking member 40 can be expressed as e; combined Figure 5As shown, the thickness of the plugging member 40 in the direction perpendicular to the plane where the opening of the pole through hole 11 is located can be expressed as e; the thickness e of the plugging member 40 can be considered as the distance between the top surface of the plugging member 40 and the surface on which the plugging member 40 is supported on the pole assembly 30. Therefore, the thickness e of the plugging member 40 is not the maximum thickness of the plugging member 40, nor is it the minimum thickness, for example, when the plugging member 40 has a variable thickness portion. The thickness e of the plugging member 40 can be 0.5mm, 0.7mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.5mm, 3mm, 4mm or 5mm, etc. The plugging member 40 can be a structure of equal thickness, or the plugging member 40 can be a structure of variable thickness.

[0052] In one embodiment, the sealing member 40 is overlapped on the top of the penetration section 32 away from the battery cell 20, and the first bent section 31 is also connected to the top of the penetration section 32; wherein, along the direction parallel to the plane where the opening of the pole through hole 11 is located, the maximum thickness of the penetration section 32 is a, and the maximum dimension of the sealing member 40 overlapping the penetration section 32 is b, 0.1≤b / a≤0.9, which can not only ensure that the penetration section 32 forms an effective support for the sealing member 40, thereby ensuring the connection stability between the sealing member 40 and the pole assembly 30, but also can control the amount of welding heat transferred to the insulating member 50, thereby reliably improving the safe use performance of the battery.

[0053] Combination Figure 6 As shown, along the direction parallel to the plane where the opening of the pole through hole 11 is located, the maximum thickness of the penetration section 32 can be expressed as a, and the maximum dimension of the sealing member 40 overlapping the penetration section 32 can be expressed as b. The ratio of the maximum dimension b of the sealing member 40 overlapping the penetration section 32 to the maximum thickness a of the penetration section 32 is too large. The maximum dimension b of the sealing member 40 overlapping the penetration section 32 is too large, and the welding heat is easily transferred to the insulating member 50; while the ratio of the maximum dimension b of the sealing member 40 overlapping the penetration section 32 to the maximum thickness a of the penetration section 32 is too small. The penetration section 32 is not convenient for positioning the sealing member 40, which will affect the welding positioning of the sealing member 40, and is not conducive to improving the manufacturing efficiency of the battery.

[0054] The ratio of the maximum dimension b of the blocking member 40 overlapping the penetration section 32 to the maximum thickness a of the penetration section 32 may be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8 or 0.9, etc.

[0055] In one embodiment, the blocking piece 40 is overlapped at the top of the penetration section 32 facing away from the battery cell 20, and the first bent section 31 is also connected to the top of the penetration section 32; wherein the blocking piece 40 and the penetration section 32 are connected by penetrating welding, that is, the welding energy can penetrate the blocking piece 40, thereby forming the melting of the blocking piece 40 and the penetration section 32, and forming a reliable and fixed connection between the blocking piece 40 and the penetration section 32.

[0056] The plugging member 40 and the penetration section 32 are connected by penetration welding. The welding strength of the plugging member 40 and the penetration section 32 is greater than that of the butt welding, and the welding position of the penetration welding can be selected to be far away from the insulating member 50, thereby reducing the heat received by the insulating member 50, thereby improving the safe use performance of the battery. The plugging member 40 and the penetration section 32 can be laser welded.

[0057] In one embodiment, Figure 6 As shown, the blocking member 40 has a bottom wall 41 overlapped on the penetration section 32 and a side wall 42 facing the first bending section 31, the side wall 42 is connected to the bottom wall 41, and the side wall 42 is inclined relative to the central axis of the pole through hole 11 toward the direction close to the first bending section 31, thereby increasing the projected overlap size of the blocking member 40 and the penetration section 32, thereby facilitating the penetration welding connection between the blocking member 40 and the penetration section 32, thereby improving the connection stability between the blocking member 40 and the penetration section 32, and ensuring the current flow capacity of the pole assembly 30.

[0058] In one embodiment, the angle between the side wall 42 and the central axis of the pole through hole 11 is 45°-90°, which can not only ensure that the projected overlap dimensions of the sealing member 40 and the penetration section 32, but also avoid that the angle is too large and affects the structural strength of the sealing member 40, thereby improving the connection stability between the sealing member 40 and the pole assembly 30.

[0059] The angle between the side wall 42 and the central axis of the pole through hole 11 can be 45°, 48°, 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85° or 90°, etc.

[0060] In one embodiment, Figure 5As shown, the plugging member 40 includes a first portion 43 and a second portion 44, the groove 34 includes a first section 341 and a second section 342, the first section 341 and the second section 342 are connected, the port area of ​​the first section 341 toward the second section 342 is larger than the port area of ​​the second section 342 toward the first section 341, the first portion 43 is located in the first section 341 to overlap the penetration section 32, and the second portion 44 is located in the second section 342; wherein the first bending section 31 forms the side wall of the first section 341, and the second bending section 33 forms the bottom wall of the second section 342. The arrangement of the first portion 43 and the second portion 44 can increase the total thickness of the plugging member 40, thereby improving the heat absorption capacity of the plugging member 40, and further effectively reduce the risk of damage to the insulating member 50 during welding, thereby improving the safe use performance of the battery.

[0061] In one embodiment, the first bending section 31, the penetration section 32 and the second bending section 33 are an integrally formed structure, 5mm≥d≥0.3mm, so that the pole assembly 30 can be installed from the inside of the battery housing 10, so that a part of the pole assembly 30 passes through the battery housing 10, and the first bending section 31 is formed by flanging, thereby forming the fixation of the pole assembly 30. The minimum vertical distance d between the weld mark 311 and the circumferential outer surface of the hole wall of the penetration section 32 facing the pole through hole 11 can be 0.3mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.3mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.3mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.3mm, 3.5mm, 3.8mm, 4mm, 4.5mm or 5mm, etc.

[0062] In one embodiment, the capacity of the battery is ≥5Ah, so that when the batteries are grouped, the number of batteries used can be effectively controlled, which is beneficial to the grouping of batteries.

[0063] It should be noted that the battery includes a cell and an electrolyte, which is the smallest unit capable of performing electrochemical reactions such as charge / discharge. A cell refers to a unit formed by winding or laminating a stacked portion, the stacked portion including a first pole sheet, a separator, and a second pole sheet. When the first pole sheet is a positive pole sheet, the second pole sheet is a negative pole sheet. The polarities of the first pole sheet and the second pole sheet can be interchanged. The first pole sheet and the second pole sheet are coated with an active material.

[0064] In one embodiment, Figure 1As shown, the battery can be a prismatic battery, for example, the battery can be a hexagonal battery, or the battery can be a quadrangular battery, the quadrangular battery mainly refers to a prismatic shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, and the corners between the sides are not necessarily right angles, and can be arc transitions. Two pole assemblies 30 can be provided on the battery housing 10, and the two pole assemblies 30 can be electrically connected to the positive pole tab and the negative pole tab of the battery cell 20 respectively. The capacity of the prismatic battery is ≥5Ah, for example, the capacity of the prismatic battery can be 5Ah-50Ah, for example, the capacity of the cylindrical battery can be 5Ah, 8Ah, 10Ah, 15Ah, 20Ah, 25Ah, 30Ah, 35Ah, 40Ah, 45Ah, 50Ah, 60Ah, 70Ah, 80Ah, 90Ah, 100Ah or 120Ah, etc.

[0065] The battery can be a laminated battery, which is not only convenient to group, but also can be processed to obtain a longer battery. Specifically, the battery cell is a laminated battery cell, which has a first pole piece stacked on top of each other, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece, so that multiple pairs of first pole pieces and second pole pieces are stacked to form a laminated battery cell.

[0066] Alternatively, the battery may be a wound battery, that is, a first pole sheet, a second pole sheet with electrical properties opposite to the first pole sheet, and a diaphragm sheet arranged between the first pole sheet and the second pole sheet are wound to obtain a wound battery cell.

[0067] In one embodiment, Figure 2 As shown, the battery can be a cylindrical battery, or the battery can be a hexagonal prism battery. The battery can be a wound battery, that is, a first pole piece, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet arranged between the first pole piece and the second pole piece are wound to obtain a wound battery cell. The capacity of the cylindrical battery can be 5Ah-50Ah, for example, the capacity of the cylindrical battery can be 5Ah, 8Ah, 10Ah, 15Ah, 20Ah, 25Ah, 30Ah, 35Ah, 40Ah, 45Ah or 50Ah, etc.

[0068] An embodiment of the utility model further provides a battery pack, which includes the above-mentioned battery.

[0069] The battery of the battery pack of one embodiment of the utility model comprises a battery case 10, a battery cell 20, a pole assembly 30, a plugging member 40 and an insulating member 50, wherein the battery cell 20 is arranged in the battery case 10, the pole assembly 30 is arranged on the battery case 10, the plugging member 40 is arranged on the pole assembly 30, and the insulating member 50 is arranged between the pole assembly 30 and the battery case 10. The penetration section 32 is penetrated in the pole through hole 11, the first bending section 31 and the second bending section 33 are respectively located on the outer side of the battery case 10 away from the battery cell 20 and the inner side close to the battery cell 20, so that the pole assembly 30 can be stably installed on the battery case 10, and the safety performance of the pole assembly 30 can be improved, and the plugging member 40 is arranged in the groove 34 of the pole assembly 30 and is welded to the pole assembly 30, which can not only ensure the connection stability between the plugging member 40 and the pole assembly 30, but also ensure the current capacity of the pole assembly 30, thereby improving the safety performance of the battery. The insulating member 50 realizes insulation protection between the pole assembly 30 and the battery housing 10, and along the direction parallel to the plane where the opening of the pole through hole 11 is located, the minimum vertical distance d≥0 between the weld mark 311 and the circumferential outer surface of the hole wall of the penetration section 32 facing the pole through hole 11 can increase the heat transfer distance on the penetration section 32 during welding, thereby reducing the probability of heat transfer to the insulating member 50, avoiding the insulating member 50 from being deformed by heat, and then ensuring the insulation performance and sealing ability of the insulating member 50, thereby improving the safe use performance of the battery pack.

[0070] In one embodiment, the battery pack is a battery module or a battery pack.

[0071] It should be noted that the battery pack may include a plurality of batteries. The plurality of batteries may be formed into a battery module and then arranged in a battery box. Alternatively, the plurality of batteries may be directly arranged in the battery box, that is, the plurality of batteries do not need to be grouped.

[0072] Those skilled in the art will readily come up with other embodiments of the present disclosure after considering the specification and practicing the utility model disclosed herein. The present disclosure is intended to cover any variation, use or adaptation of the present utility model, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and example embodiments are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0073] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from its scope. The scope of protection of the present disclosure is limited only by the appended claims.

Claims

1. A battery, characterized in that: include: A battery housing (10), wherein a terminal through hole (11) is provided on the battery housing (10); A battery cell (20), wherein the battery cell (20) is arranged in the battery casing (10); A pole assembly (30), the pole assembly (30) being arranged in the pole through hole (11), the battery cell (20) being electrically connected to the pole assembly (30), the pole assembly (30) having a penetration section (32) at least partially penetrated in the pole through hole (11), the penetration section (32) being provided with a first bending section (31) on the outer side of the battery housing (10) away from the battery cell (20), the penetration section (32) being provided with a second bending section (33) on the inner side of the battery housing (10) close to the battery cell (20), the first bending section (31) and the second bending section (33) fixing the pole assembly (30) to the battery housing (10), and a groove (34) being formed on the side of the pole assembly (30) away from the battery cell (20); a plugging piece (40), at least a portion of the plugging piece (40) being disposed in the groove (34), the plugging piece (40) being welded to the pole assembly (30), so that a welding mark (311) is formed on a side of the plugging piece (40) and / or the pole assembly (30) facing away from the battery cell (20); An insulating member (50), at least a portion of which is disposed between the pole assembly (30) and the battery housing (10), and along a direction parallel to a plane where an opening of the pole through hole (11) is located, a minimum vertical distance between the weld mark (311) and a circumferential outer surface of a hole wall of the penetration section (32) facing the pole through hole (11) is d, and d≥0.

2. The battery according to claim 1, characterized in that At least part of the insulating member (50) is located in the pole through hole (11), so that at least part of the insulating member (50) is located between the battery housing (10) and the penetration section (32).

3. The battery according to claim 2, characterized in that The insulating member (50) comprises a sealing portion, at least a portion of which is located between the battery housing (10) and the first bending section (31).

4. The battery according to claim 2, characterized in that The insulating member (50) comprises a sealing portion, at least a portion of which is located between the battery housing (10) and the second bent section (33).

5. The battery according to claim 1, characterized in that The melting temperature of the insulating member (50) is 120°C-400°C.

6. The battery according to claim 1, characterized in that The insulating member (50) comprises a supporting portion, the supporting portion is located between the battery housing (10) and the first bending section (31), and the Rockwell hardness of the supporting portion is 45-150.

7. The battery according to claim 1, characterized in that Along a direction parallel to the plane where the opening of the pole through hole (11) is located, the maximum thickness a of the penetration section (32) is 1 mm to 4 mm.

8. The battery according to any one of claims 1 to 7, characterized in that The blocking piece (40) is butt-welded to the first bent section (31); along a direction perpendicular to the plane where the opening of the pole through hole (11) is located, the thickness c of the first bent section (31) is 0.3 mm-2 mm.

9. The battery according to any one of claims 1 to 7, characterized in that Along a direction perpendicular to the plane where the opening of the pole through hole (11) is located, the thickness e of the blocking member (40) is ≥ 0.5 mm.

10. The battery according to any one of claims 1 to 7, characterized in that The blocking member (40) is overlapped on the top end of the penetration section (32) away from the battery core (20), and the first bent section (31) is also connected to the top end of the penetration section (32); Wherein, along the direction parallel to the plane where the opening of the pole through hole (11) is located, the maximum thickness of the penetration section (32) is a, the maximum dimension of the blocking member (40) overlapping the penetration section (32) is b, and 0.1≤b / a≤0.

9.

11. The battery according to any one of claims 1 to 7, characterized in that The blocking member (40) is overlapped on the top end of the penetration section (32) away from the battery core (20), and the first bent section (31) is also connected to the top end of the penetration section (32); The blocking piece (40) is connected to the penetration section (32) by penetrating welding.

12. The battery according to any one of claims 1 to 7, characterized in that The blocking member (40) comprises a first portion (43) and a second portion (44); the groove (34) comprises a first section (341) and a second section (342); the first section (341) and the second section (342) are connected; a port area of ​​the first section (341) facing the second section (342) is larger than a port area of ​​the second section (342) facing the first section (341); the first portion (43) is located in the first section (341) to overlap the penetration section (32); and the second portion (44) is located in the second section (342); The first bending section (31) forms a side wall of the first section (341), and the second bending section (33) forms a bottom wall of the second section (342).

13. The battery according to any one of claims 1 to 7, characterized in that The first bending section (31), the penetration section (32) and the second bending section (33) are an integrally formed structure, and 5mm≥d≥0.3mm.

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