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 terminal post assembly is arranged in the terminal post through hole, the connecting section is arranged in the terminal post through hole in a penetrating manner, the riveting section and the limiting section are respectively positioned on the outer side, far away from the battery cell, of the battery shell and the inner side, close to the battery cell, of the battery shell so as to clamp the battery shell, a groove is formed in one side, far away from the battery cell, of the terminal post assembly, and the riveting section is arranged around the groove; wherein the minimum thickness of the limiting section in the first direction is a, the minimum thickness of the connecting section in the second direction is b, and a / b is greater than or equal to 0.125 and less than or equal to 3, so that the reliable structural strength of the riveting section and the limiting section can be ensured, and the influence on the safety performance of the pole assembly caused by deformation and bending of the connecting part of the riveting section and the limiting section due to internal air pressure of the battery is avoided; and the pole assembly can be ensured to have enough over-current capability, so that the safe use performance of the battery is reliably improved.

Description

Technical Field

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

[0002] In the related art, a large amount of gas is produced during the use of the battery, and the gas pressure is high, which has a great impact on the pole assembly arranged on the battery shell. Due to the structural limitations of the pole assembly, the structural assembly may have poor stability or structural damage. 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 battery cell is electrically connected to the pole assembly, a groove is formed on the side of the pole assembly away from the battery cell, the pole assembly includes a riveted section, a connecting section and a limiting section, the riveted section and the limiting section are respectively located on both sides of the outside and inside of the battery shell to clamp the battery shell, the connecting section connects the riveted section and the limiting section, the connecting section is penetrated in the pole through hole and forms a groove together with the limiting section, and the riveted section is arranged around the groove;

[0008] Among them, along the first direction, the minimum thickness of the limiting section is a, along the second direction, the minimum thickness of the connecting section is b, 0.125≤a / b≤3, the first direction is perpendicular to the plane where the opening of the pole through hole is located, and the second direction is parallel to the plane where the opening of the pole through hole is located.

[0009] The battery of the embodiment of the utility model includes a battery shell, a battery cell and a pole assembly, wherein the battery cell is arranged in the battery shell, and the pole assembly is arranged on the battery shell, thereby realizing electrical connection between the battery cell and the pole assembly. The connecting section of the pole assembly is inserted into the pole through hole of the battery shell, and the riveting section and the limiting 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 that the riveting section and the limiting section can form a clamp on the battery shell, ensuring that the pole assembly is stably fixed on the battery shell. A groove is formed on the side of the pole assembly away from the battery cell, and the riveting section is arranged around the groove, thereby facilitating the molding of the riveting section after the pole assembly is arranged on the battery shell, thereby ensuring that the riveting section and the limiting section form a reliable fixation to the battery shell. Along the first direction, the minimum thickness of the limiting section is a, and along the second direction, the minimum thickness of the connecting section is b, 0.125≤a / b≤3. This can not only ensure that the riveted section and the limiting section have reliable structural strength, but also avoid deformation and bending at the connection between the riveted section and the limiting section caused by the internal air pressure of the battery, thereby affecting the safety performance of the pole assembly, but also ensure that the pole assembly has sufficient current flow capacity, thereby reliably improving the safe use performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] 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:

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

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

[0013] Figure 3 is a schematic diagram of a partial cross-sectional structure of a battery according to a first exemplary embodiment;

[0014] Figure 4 is a schematic diagram of a partial cross-sectional structure of a battery according to a second exemplary embodiment;

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

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

[0017] The following are the descriptions of the reference numerals:

[0018] 10. Battery case; 11. Pole through hole; 20. Battery cell; 30. Pole assembly; 31. Riveted section; 32. Connecting section; 33. Position limiting section; 331. First area; 332. Second area; 333. Through hole; 34. Groove; 40. Seal; 50. Blocking member; 60. Insulator. DETAILED DESCRIPTION

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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.

[0023] An embodiment of the present utility model provides a battery, please refer to Figures 1 to 5The battery comprises: a battery housing 10, wherein the battery housing 10 is provided with a pole through hole 11; a battery cell 20, wherein the battery cell 20 is arranged in the battery housing 10; a pole assembly 30, wherein the battery cell 20 is electrically connected to the pole assembly 30, wherein a groove 34 is formed on the side of the pole assembly 30 away from the battery cell 20, and the pole assembly 30 comprises a riveting section 31, a connecting section 32 and a limiting section 33, wherein the riveting section 31 and the limiting section 33 are respectively located on the outer and inner sides of the battery housing 10 to clamp the battery housing 10, and the connecting section 32 is provided on the inner and outer sides of the battery housing 10 to clamp the battery housing 10. The segment 32 connects the riveted segment 31 and the limiting segment 33. The connecting segment 32 is arranged in the pole through hole 11 and forms a groove 34 together with the limiting segment 33. The riveted segment 31 is arranged around the groove 34; wherein, along the first direction, the minimum thickness of the limiting segment 33 is a, and along the second direction, the minimum thickness of the connecting segment 32 is b, 0.125≤a / b≤3, the first direction is perpendicular to the plane where the opening of the pole through hole 11 is located, and the second direction is parallel to the plane where the opening of the pole through hole 11 is located.

[0024] A battery of one embodiment of the utility model comprises a battery housing 10, a battery cell 20 and a pole assembly 30, wherein the battery cell 20 is arranged in the battery housing 10, and the pole assembly 30 is arranged on the battery housing 10, thereby realizing electrical connection between the battery cell 20 and the pole assembly 30. The connecting section 32 of the pole assembly 30 is arranged in the pole through hole 11 of the battery housing 10, and the riveting section 31 and the limiting 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 riveting section 31 and the limiting section 33 can form a clamping of the battery housing 10, ensuring that the pole assembly 30 is stably fixed on the battery housing 10. A groove 34 is formed on the side of the pole assembly 30 away from the battery cell 20, and the riveting section 31 is arranged around the groove 34, thereby facilitating the forming of the riveting section 31 after the pole assembly 30 is arranged on the battery housing 10, thereby ensuring that the riveting section 31 and the limiting section 33 form a reliable fixation of the battery housing 10. Along the first direction, the minimum thickness of the limiting section 33 is a, and along the second direction, the minimum thickness of the connecting section 32 is b, 0.125≤a / b≤3. This can not only ensure that the riveted section 31 and the limiting section 33 have reliable structural strength, but also avoid deformation and bending at the connection between the riveted section 31 and the limiting section 33 caused by the internal air pressure of the battery, thereby affecting the safety performance of the pole assembly 30, but also ensure that the pole assembly 30 has sufficient current flow capacity, thereby reliably improving the safe use performance of the battery.

[0025] 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 .

[0026] The pole assembly 30 is disposed in the pole through hole 11, and includes a riveted section 31, a connecting section 32, and a limiting section 33. The riveted section 31 and the connecting section 32 are an integrally formed structure, and the riveted section 31 and the limiting 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 to clamp the battery housing 10. The connecting section 32 and the limiting section 33 together form a groove 34.

[0027] Combination Figures 3 to 5 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 Figures 3 to 5 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 5 As shown, the pole assembly 30 includes a riveted section 31, a connecting section 32 and a limiting section 33, the connecting section 32 connects the riveted section 31 and the limiting section 33, the connecting section 32 is arranged in the pole through hole 11, the riveted section 31 and the limiting 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 riveted section 31 and the limiting section 33 can clamp the battery housing 10, thereby ensuring that the pole assembly 30 is stably fixed on the battery housing 10. The riveted section 31 and the connecting section 32 are an integrally formed structure, thereby facilitating the installation of the pole assembly 30, and ensuring the structural strength of the riveted section 31 and the connecting section 32, thereby improving the safe use performance of the pole assembly 30.

[0030] The riveted section 31 may be a structure formed by flanging after the pole assembly 30 is installed on the battery housing 10, thereby ensuring that the riveted section 31 and the limiting section 33 are fixed to the battery housing 10, thereby forming a reliable fixation of the pole assembly 30. For example, during the installation of the pole assembly 30, the insulating member 60 may be installed on the battery housing 10, and then the initial riveted section that has not been bent is passed through the inner side of the battery housing 10. At this time, the limiting section 33 is used to limit the pole assembly 30, and then the initial riveted section extending in a straight line is bent outward, thereby forming the riveted section 31, and then the limiting section 33 and the riveted section 31 can form a clamping of the battery housing 10.

[0031] Combination Figures 3 to 5As shown, a groove 34 is formed on the side of the pole assembly 30 facing away from the battery cell 20, and the rivet section 31 is arranged around the groove 34. The arrangement of the groove 34 can form the rivet section 31 through flanging after the pole assembly 30 is installed on the battery housing 10, so that the rivet section 31 and the limiting section 33 can clamp the battery housing 10, thereby realizing the installation and fixation of the pole assembly 30.

[0032] like Figure 3 As shown, the first direction can be represented as A, and the second direction can be represented as B. The first direction is perpendicular to the plane where the opening of the pole through hole 11 is located, and the second direction is parallel to the plane where the opening of the pole through hole 11 is located. Along the first direction A, the minimum thickness of the limiting section 33 can be represented as a, and along the second direction B, the minimum thickness of the connecting section 32 can be represented as b.

[0033] A large amount of gas is produced during the use of the battery, which makes the internal gas pressure of the battery high, and the strength requirements of the pole assembly 30 are high. When the ratio of the minimum thickness a of the limiting section 33 to the minimum thickness b of the connecting section 32 is too small, the thickness of the limiting section 33 is thinner and the thickness of the connecting section 32 is thicker. When the gas pressure presses upward on the bottom wall of the groove 34, the bottom wall is easily deformed and bent along the corner connection between the connecting section 32 and the bottom wall of the groove 34, thereby causing the risk of fracture; when the ratio of the minimum thickness a of the limiting section 33 to the minimum thickness b of the connecting section 32 is too large, the thickness of the limiting section 33 is thicker and the thickness of the connecting section 32 is thinner. When the gas presses upward on the bottom wall of the groove 34, the connecting section 32 may be crushed and deformed, and it will affect the flow area of ​​the pole assembly 30, and it is more likely to deform after heating, and the structural strength is insufficient. In this embodiment, by making the ratio of the minimum thickness a of the limiting section 33 to the minimum thickness b of the connecting section 32 0.125≤a / b≤3, the balance between the structural strength and the current carrying capacity of the pole assembly 30 can be effectively ensured.

[0034] The ratio of the minimum thickness a of the limiting section 33 to the minimum thickness b of the connecting section 32 can be 0.125, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9 or 3, etc.

[0035] In one embodiment, the riveted section 31 is a flange formed by bending from the connecting section 32 in a direction away from the battery cell 20 toward the surface of the battery casing 10, so that when the pole assembly 30 is installed, the riveted section 31 can be easily formed, thereby ensuring the installation efficiency and fixing performance of the pole assembly 30.

[0036] The riveted section 31 and the connecting section 32 are an integrally formed structure. The riveted section 31 is a flange formed by bending from the connecting section 32 in a direction away from the battery cell 20 and in a direction close to the surface of the battery housing 10 .

[0037] In one embodiment, Figure 5 As shown, the limiting section 33 includes a first area 331 and a second area 332, the second area 332 is arranged around the first area 331, the first area 331 forms the bottom wall of the groove 34, the second area 332 is connected to the connecting section 32, and part of the second area 332 and the riveting section 31 clamp the battery housing 10; wherein, along the first direction, the difference between the thickness of the second area 332 and the thickness of the first area 331 is 1mm-5mm, so that the second area 332 can be reliably limited and fixed with the battery housing 10, and deformation and bending of the corner connection between the connecting section 32 and the bottom wall of the groove 34 of the first area 331 can be avoided, thereby ensuring the structural strength of the pole assembly 30.

[0038] The second region 332 is arranged around the first region 331, and the first region 331 forms the bottom wall of the groove 34, that is, the second region 332 is connected to the connecting section 32. The second region 332 and the riveting section 31 can clamp the battery housing 10, thereby ensuring that the pole assembly 30 is stably fixed on the battery housing 10.

[0039] The thickness of the first region 331 or the second region 332 may be a.

[0040] The difference between the thickness of the second region 332 and the thickness of the first region 331 can be 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm or 5mm, etc.

[0041] In one embodiment, Figure 5 As shown, the limiting section 33 includes a first area 331 and a second area 332, the second area 332 is arranged around the first area 331, the first area 331 forms the bottom wall of the groove 34, the second area 332 is connected to the connecting section 32, and a part of the second area 332 and the riveting section 31 clamp the battery housing 10; wherein, along the second direction, the ratio of the maximum dimension of the first area 331 to the maximum dimension of the second area 332 is 0.5-10, thereby effectively controlling the size of the first area 331, reducing the deformation probability of the first area 331, and also ensuring that the second area 332 and the riveting section 31 form an effective fixation of the battery housing 10.

[0042] During the use of the battery, when the pole assembly 30 is subjected to upward top pressure, there is a cavity above the first area 331, and there is no other component to transmit and share the force, which makes the first area 331 easy to deform, while the second area 332 is directly opposite to the connecting section 32 and the battery shell 10, and the force can be transmitted and dispersed, so the second area 332 has a stronger load-bearing capacity; by making the ratio of the maximum size of the first area 331 to the maximum size of the second area 332 be 0.5-10, the length size of the first area 331 and the second area 332 can be effectively controlled, the safe use performance of the pole assembly 30 is ensured, the problem of large-scale deformation of the pole assembly 30 is avoided, and the current carrying capacity and fixing capacity of the pole assembly 30 can also be ensured.

[0043] Along the second direction, the ratio of the maximum dimension of the first area 331 to the maximum dimension of the second area 332 can be 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, 3.2, 3.5, 3.8, 4, 4.2, 4.5, 4.8, 5, 5.2, 5.5, 5.8, 6, 6.2, 6.5, 6.8, 7, 7.2, 7.5, 7.8, 8, 8.2, 8.5, 8.8, 9, 9.2, 9.4, 9.5, 9.8 or 10, etc.

[0044] In one embodiment, the connecting section 32 forms at least part of the side wall of the groove 34, and the limiting section 33 forms the bottom wall of the groove 34; wherein, there is an arc transition between the side wall of the groove 34 and the bottom wall of the groove 34, thereby allowing the arc transition portion to absorb stress, thereby improving the bending resistance between the connecting section 32 and the limiting section 33, and further reducing the risk of fracture between the connecting section 32 and the limiting section 33, thereby improving the safe use performance of the pole assembly 30.

[0045] In one embodiment, Figure 4 As shown, the connecting section 32 forms at least a portion of the side wall of the groove 34, and the limiting section 33 forms the bottom wall of the groove 34; wherein, a through hole 333 is provided on the limiting section 33, and the through hole 333 is connected to the groove 34, so that the through hole 333 can be used for the injection of electrolyte, thereby improving the application range of the pole assembly 30.

[0046] The limiting section 33 is provided with a through hole 333, which can be used as a liquid injection hole. In this case, the battery housing 10 may no longer be provided with a liquid injection hole. Alternatively, the through hole 333 can also be provided for the tab of the power core 20 to pass through, thereby increasing the connection area between the tab and the pole assembly 30.

[0047] In one embodiment, the diameter of the through hole 333 is d, 0.5≤d / a≤10, which can ensure the size of the through hole 333, facilitate the rapid injection of electrolyte, and ensure that the limiting section 33 has reliable structural strength.

[0048] The through hole 333 may be a circular hole, and the diameter of the circular hole is d. The ratio of the diameter d of the through hole 333 to the minimum thickness a of the limiting section 33 is too large, the diameter d of the circular hole is too large, and the portion of the limiting section 33 with the groove 34 is thin, and the structural strength is insufficient. The ratio of the diameter d of the through hole 333 to the minimum thickness a of the limiting section 33 is too small, the diameter d of the circular hole is too small, the injection efficiency is low, and it is not conducive to improving the manufacturing efficiency of the battery.

[0049] Combination Figure 4 As shown, the diameter of the through hole 333 can be expressed as d. The ratio of the diameter d of the through hole 333 to the minimum thickness a of the limiting section 33 can be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 2, 2.1, 2.2, 2.3, 2.4, 2.5, 2.6, 2.7, 2.8, 2.9, 3, 3.2, 3.5, 3.8, 4, 4.2, 4.5, 4.8, 5, 5.2, 5.5, 6, 6.5, 7, 7.5, 8, 8.5, 9, 9.5 or 10, etc.

[0050] In one embodiment, the diameter of the through hole 333 is d, 2mm≤d≤5mm, so that the through hole 333 can allow electrolyte to pass through quickly, thereby improving the battery filling efficiency, and also preventing the through hole 333 from being too large to affect the structural strength and current flow capacity of the limiting section 33.

[0051] The diameter d of the through hole 333 may be 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, 3.2 mm, 3.5 mm, 3.8 mm, 4 mm, 4.2 mm, 4.5 mm, 4.8 mm or 5 mm, etc.

[0052] In one embodiment, if Figure 4 and Figure 5 As shown, the battery further includes a seal 40, which is disposed in the through hole 333, so that after the electrolyte is injected through the through hole 333, the seal 40 can be used to seal the through hole 333 to avoid the risk of electrolyte leakage.

[0053] If the through hole 333 is not blocked, the electrolyte will enter the groove 34, and the risk of battery leakage will increase. The risk of electrolyte leakage can be effectively reduced by setting the seal 40. The seal 40 can be a metal part, for example, the seal 40 can be welded to the limiting section 33.

[0054] In one embodiment, the connecting section 32 forms at least part of the side wall of the groove 34, and the limiting section 33 forms the bottom wall of the groove 34; wherein the bottom wall of the groove 34 is basically a rectangular surface, an elliptical surface or a circular surface, and the maximum length dimension of the bottom wall of the groove 34 is g, 1≤g / b≤32, which can not only ensure the structural strength of the limiting section 33, but also meet the current flow capacity of the limiting section 33, thereby also improving the overall energy density of the battery.

[0055] The bottom wall of the groove 34 is basically a rectangular surface, an elliptical surface or a circular surface, that is, the shape of the bottom wall of the groove 34 is approximately a rectangular surface, an elliptical surface or a circular surface, and the maximum length dimension of the bottom wall of the groove 34 is g. For example, if the bottom wall of the groove 34 is a rectangular surface, the long side dimension of the rectangular surface is expressed as g, or if the bottom wall of the groove 34 is an elliptical surface, the long axis dimension of the elliptical surface is expressed as g, or if the bottom wall of the groove 34 is a circular surface, the diameter of the circular surface is expressed as g. Figure 4 As shown, the maximum length dimension of the bottom wall of the groove 34 can be represented as g.

[0056] The pole assembly 30 has a groove 34, which is equivalent to a cavity hollowed out in the pole assembly 30. For example, the bottom wall of the groove 34 is a circular surface, and the ratio of the diameter g of the circular surface to the minimum thickness b of the connecting section 32 is too large, the inner diameter of the groove 34 is too large and the thickness of the connecting section 32 is small. Under the pressure of air pressure, the bottom wall of the groove 34 is easy to bend and deform; the ratio of the diameter g of the circular surface to the minimum thickness b of the connecting section 32 is too small, the inner diameter of the groove 34 is too small and the thickness of the connecting section 32 is large. The structural strength and current flow are met, but it is not conducive to weight reduction, it is not conducive to improving the mass energy density of the battery, and when the riveted section 31 is turned outward for riveting, the operating space left for the riveting tooling is also too small, which is not conducive to improving the manufacturing efficiency of the battery.

[0057] The ratio of the diameter g of the circular surface to the minimum thickness b of the connecting section 32 can be 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 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 or 32, etc.

[0058] In one embodiment, the connecting section 32 forms at least a portion of the side wall of the groove 34, and the limiting section 33 forms the bottom wall of the groove 34; wherein, the bottom wall of the groove 34 is a circular surface, the diameter of the circular surface is g, and the circumferential outer contour of the limiting section 33 forms a circle, the diameter of the circle is t, 1≤g / (tg)≤5, thereby ensuring that the limiting section 33 can be reliably fixed on the battery housing 10, reducing the risk of deformation of the limiting section 33.

[0059] Combination Figure 4As shown, the circumferential outer contour of the limiting section 33 forms a circle, and the diameter of the circle can be expressed as t. When the pole assembly 30 is subjected to an upward top pressure, the larger the g / (tg), the easier it is for the pole assembly 30 to deform. Because of the presence of the groove 34, the upward force is entirely transmitted to the portion of the limiting section 33 excluding the groove 34. Therefore, it is necessary to ensure that the portion of the limiting section 33 without the groove 34 needs to have a reliable length. The circumferential outer contour of the limiting section 33 forms a circle, and it can be further considered that the orthographic projection of the circumferential outer surface of the limiting section 33 along the first direction can be a circle.

[0060] g / (tg) can be 1, 1.2, 1.5, 1.8, 2, 2.2, 2.5, 2.8, 3, 3.2, 3.5, 3.8, 4, 4.2, 4.5, 4.8 or 5, etc.

[0061] In one embodiment, Figures 3 to 5 As shown, the battery also includes a sealing member 50, at least part of which is disposed in the groove 34. Along the first direction, the thickness of the sealing member 50 is 0.5 mm-5 mm, thereby ensuring that the sealing member 50 has sufficient structural strength to avoid bending and deformation under air pressure, and also achieving battery weight reduction, thereby controlling the overall energy density of the battery.

[0062] The blocking member 50 can be connected to the pole assembly 30 by welding. The thickness of the blocking member 50 can be 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm or 5mm, etc.

[0063] In one embodiment, Figure 6 As shown, the battery also includes a sealing member 50, at least part of which is arranged on the end face of the riveted section 31 away from the connecting section 32 to seal the groove 34. Along the first direction, the thickness of the sealing member 50 is 0.5mm-5mm. On the basis of ensuring that the sealing member 50 has sufficient structural strength, the sealing member 50 can also form a structural reinforcement for the pole assembly 30 to further increase the current flow capacity.

[0064] In one embodiment, along the first direction, the battery housing 10 is provided with a pole through hole 11 with a wall thickness of c, and along the second direction, the maximum size of the pole assembly 30 is e, e / c≥2, thereby ensuring that the battery housing 10 can have a relatively high structural strength and reduce the risk of deformation.

[0065] During the use of the battery, the force on the pole assembly 30 will eventually be transmitted to the wall surface of the battery housing 10 where the pole through hole 11 is provided. Figure 3As shown, along the first direction A, the wall thickness of the battery housing 10 provided with the pole through hole 11 can be expressed as c, and along the second direction B, the maximum size of the pole assembly 30 can be expressed as e. The ratio of the maximum size e of the pole assembly 30 to the wall thickness c of the battery housing 10 provided with the pole through hole 11 is ≥2, which can effectively control the structural strength of the battery housing 10 and reduce the risk of deformation of the wall surface of the battery housing 10 provided with the pole through hole 11 under stress.

[0066] The ratio of the maximum dimension e of the pole assembly 30 to the wall thickness c of the battery housing 10 provided with the pole through hole 11 can be 2, 2.2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 7, 8, 9, 10, 11 or 12, etc.

[0067] In one embodiment, along the first direction, the thickness of the riveted section 31 is f, 0.5≤a / f≤2, thereby ensuring that the riveted section 31 and the limiting section 33 can have relatively balanced thicknesses, which is beneficial to the distribution of force and thus improves safety performance.

[0068] Combination Figure 3 As shown, along the first direction, the thickness of the riveted section 31 can be expressed as f. The ratio of the minimum thickness a of the limiting section 33 to the thickness f of the riveted section 31 can be 0.5-2. The ratio of the minimum thickness a of the limiting section 33 to the thickness f of the riveted section 31 can be 0.5, 0.6, 0.7, 0.8, 0.9, 1, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9 or 2, etc.

[0069] The riveted section 31 and the limiting section 33 clamp the battery housing 10 together, and are jointly subjected to the pressure of the insulating member 60 and the gas pressure inside the battery. The riveted section 31 and the limiting section 33 have balanced thickness, which is more conducive to force dispersion.

[0070] 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 active materials.

[0071] In one embodiment, Figure 1 As shown, the battery can be a quadrangular prism battery, which mainly refers to a quadrangular prism battery with a prism shape, but it is not strictly limited whether each side of the prism must be a straight line in the strict sense, 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.

[0072] 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.

[0073] 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.

[0074] In one embodiment, Figure 2 As shown, the battery may be a cylindrical battery, or the battery may be a hexagonal prism battery. The battery may be a wound battery, that is, a first pole piece, a second pole piece with electrical properties opposite to the first pole piece, and a diaphragm sheet disposed between the first pole piece and the second pole piece are wound to obtain a wound battery cell.

[0075] In one embodiment, the battery is a lithium manganese iron phosphate battery. On the basis of ensuring that the pole assembly 30 can have a reliable current-carrying capacity, it can also avoid excessive gas generation during the use of the battery, which may affect the structural strength of the battery.

[0076] In one embodiment, the battery is a silicon-based lithium-ion battery, which can not only reduce the impact of internal pressure on the structural strength of the battery housing 10 and the pole assembly 30 during battery use, but also ensure that the pole assembly 30 has sufficient current flow capacity, thereby improving the safe use performance of the battery.

[0077] In one embodiment, Figure 1 As shown, the battery is a quadrangular prism battery. On the basis of ensuring that the pole assembly 30 has reliable current-carrying capacity, it can also ensure that the battery housing 10 has reliable structural strength to prevent the pole assembly 30 from damaging the battery housing 10.

[0078] In one embodiment, Figure 2 As shown, the battery is a cylindrical battery. The cylindrical battery is a high expansion system. The expansion gap is generally designed to be larger. The gas pressure is relatively large after the battery produces gas in the later stage. By making the ratio of the minimum thickness a of the limiting section 33 to the minimum thickness b of the connecting section 32 be 0.125-3, the safety risk of the battery can be effectively reduced.

[0079] In one embodiment, along the first direction, the depth S1 of the groove 34 is 1 mm-4 mm, thereby ensuring that the pole assembly 30 can be effectively reduced in weight and avoiding excessive reduction in the structural strength of the pole assembly 30 .

[0080] Combination Figure 3 As shown, the depth of the groove 34 can be expressed as S1. The depth S1 of the groove 34 can be 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm or 4mm, etc.

[0081] In one embodiment, along the first direction, the side wall depth S2 of the groove 34 formed by the connecting section 32 is 1 mm-4 mm, thereby controlling the height of the connecting section 32 and ensuring the structural strength and flow capacity of the connecting section 32 .

[0082] Combination Figure 3 As shown, the side wall depth of the groove 34 formed by the connecting section 32 can be expressed as S2. The side wall depth S2 of the groove 34 formed by the connecting section 32 can be 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm or 4mm, etc.

[0083] In one embodiment, the riveted section 31, the connecting section 32 and the limiting section 33 are an integrally formed structure, so that the pole assembly 30 can be installed from the inside of the battery housing 10, so that a portion of the pole assembly 30 passes through the battery housing 10, and the riveted section 31 is formed by flanging processing, thereby fixing the pole assembly 30.

[0084] An embodiment of the utility model further provides a battery pack, comprising the above-mentioned battery.

[0085] The battery of the battery pack of one embodiment of the utility model comprises a battery housing 10, a battery cell 20 and a pole assembly 30, wherein the battery cell 20 is arranged in the battery housing 10, and the pole assembly 30 is arranged on the battery housing 10, thereby realizing electrical connection between the battery cell 20 and the pole assembly 30. The connecting section 32 of the pole assembly 30 is penetrated in the pole through hole 11 of the battery housing 10, and the riveting section 31 and the limiting 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 riveting section 31 and the limiting section 33 can clamp the battery housing 10, ensuring that the pole assembly 30 is stably fixed on the battery housing 10. A groove 34 is formed on the side of the pole assembly 30 away from the battery cell 20, and the riveted section 31 is arranged around the groove 34, so that after the pole assembly 30 is arranged on the battery housing 10, the riveted section 31 can be easily formed, thereby ensuring that the riveted section 31 and the limiting section 33 form a reliable fixation to the battery housing 10. Along the first direction, the minimum thickness of the limiting section 33 is a, and along the second direction, the minimum thickness of the connecting section 32 is b, 0.125≤a / b≤3, which can not only ensure that the riveted section 31 and the limiting section 33 can have reliable structural strength, avoid deformation and bending of the connection between the riveted section 31 and the limiting section 33 caused by the internal air pressure of the battery, and affect the safety performance of the pole assembly 30, but also ensure that the pole assembly 30 can have sufficient current capacity, thereby reliably improving the safe use performance of the battery pack.

[0086] In one embodiment, the battery pack is a battery module or a battery pack.

[0087] It should be noted that the battery pack includes a plurality of batteries. The plurality of batteries can be arranged in a battery box after forming a battery module. Alternatively, the plurality of batteries can be directly arranged in the battery box, that is, the plurality of batteries do not need to be grouped.

[0088] 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.

[0089] 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 battery cell (20) being electrically connected to the pole assembly (30), a groove (34) being formed on a side of the pole assembly (30) facing away from the battery cell (20), the pole assembly (30) comprising a riveted section (31), a connecting section (32) and a limiting section (33), the riveted section (31) and the limiting section (33) being respectively located on the outer and inner sides of the battery housing (10) to clamp the battery housing (10), the connecting section (32) connecting the riveted section (31) and the limiting section (33), the connecting section (32) being inserted into the pole through hole (11) and forming the groove (34) together with the limiting section (33), the riveted section (31) being arranged around the groove (34); Wherein, along the first direction, the minimum thickness of the limiting section (33) is a, and along the second direction, the minimum thickness of the connecting section (32) is b, 0.125≤a / b≤3, the first direction is perpendicular to the plane where the opening of the pole through hole (11) is located, and the second direction is parallel to the plane where the opening of the pole through hole (11) is located.

2. The battery according to claim 1, characterized in that The limiting section (33) comprises a first area (331) and a second area (332), the second area (332) being arranged around the first area (331), the first area (331) forming a bottom wall of the groove (34), the second area (332) being connected to the connecting section (32), and a portion of the second area (332) and the riveting section (31) clamping the battery housing (10); Wherein, along the first direction, the difference between the thickness of the second region (332) and the thickness of the first region (331) is 1 mm-5 mm, and / or, along the second direction, the ratio of the maximum dimension of the first region (331) to the maximum dimension of the second region (332) is 0.5-10.

3. The battery according to claim 1, characterized in that The riveted section (31) is a flange formed by extending from the connecting section (32) in a direction away from the battery core (20) and bending in a direction close to the surface of the battery housing (10).

4. The battery according to claim 1, characterized in that The connecting section (32) forms at least a portion of the side wall of the groove (34), and the limiting section (33) forms the bottom wall of the groove (34); There is an arc transition between the side wall of the groove (34) and the bottom wall of the groove (34).

5. The battery according to claim 1, characterized in that The connecting section (32) forms at least a portion of the side wall of the groove (34), and the limiting section (33) forms the bottom wall of the groove (34); Wherein, a through hole (333) is provided on the limiting section (33), and the through hole (333) is connected to the groove (34).

6. The battery according to claim 5, characterized in that The diameter of the through hole (333) is d, 0.5≤d / a≤10, and / or, 2mm≤d≤5mm.

7. The battery according to claim 5, characterized in that The battery further comprises a sealing member (40), wherein the sealing member (40) is arranged in the through hole (333).

8. The battery according to claim 1, characterized in that The connecting section (32) forms at least a portion of the side wall of the groove (34), and the limiting section (33) forms the bottom wall of the groove (34); The bottom wall of the groove (34) is basically a rectangular surface, an elliptical surface or a circular surface, and the maximum length dimension of the bottom wall of the groove (34) is g, and 1≤g / b≤32.

9. The battery according to claim 1, characterized in that The connecting section (32) forms at least a portion of the side wall of the groove (34), and the limiting section (33) forms the bottom wall of the groove (34); The bottom wall of the groove (34) is a circular surface, the diameter of the circular surface is g, the circumferential outer contour of the limiting section (33) forms a circle, the diameter of the circle is t, and 1≤g / (tg)≤5.

10. The battery according to any one of claims 1 to 9, characterized in that The battery further comprises a blocking member (50), at least a portion of the blocking member (50) being arranged on an end surface of the riveting section (31) away from the connecting section (32) to block the groove (34), or at least a portion of the blocking member (50) being arranged in the groove (34); Wherein, along the first direction, the thickness of the blocking member (50) is 0.5 mm-5 mm.

11. The battery according to any one of claims 1 to 9, characterized in that Along the first direction, the battery housing (10) is provided with the pole through hole (11) having a wall thickness of c, and along the second direction, the maximum dimension of the pole assembly (30) is e, where e / c≥2.

12. The battery according to any one of claims 1 to 9, characterized in that Along the first direction, the thickness of the riveted section (31) is f, and 0.5≤a / f≤2.

13. The battery according to any one of claims 1 to 9, characterized in that The battery is a lithium manganese iron phosphate battery; or, the battery is a silicon-based lithium-ion battery, or, the battery is a cylindrical battery, or, the battery is a quadrangular prism battery.

14. The battery according to any one of claims 1 to 9, characterized in that Along the first direction, the depth S1 of the groove (34) is 1 mm-4 mm, or the depth S2 of the side wall of the groove (34) formed by the connecting section (32) is 1 mm-4 mm, or the riveting section (31), the connecting section (32) and the limiting section (33) are an integrally formed structure.

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