Battery

Abstract

The invention discloses a battery and relates to the technical field of batteries, the battery comprises a side frame, a fixing ring and an electrode assembly, the side frame is made of a metal material, the fixing ring is connected with the side frame and protrudes outwards from the side frame, and the fixing ring is provided with a through hole communicating the inner side and the outer side of the side frame; the electrode assembly comprises the electrode column penetrating through the through hole and the annular insulating ring filled between the inner wall of the through hole and the electrode column, the insulating structure between the electrode column and the side frame is simpler, the number of parts is reduced, the cost is reduced, meanwhile, the part, located in the battery, of the electrode assembly is fewer, and the service life of the battery is prolonged. The occupation of the internal space of the battery is reduced, and the energy density of the battery is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery manufacturing, and particularly relates to a battery. Background Art

[0002] A battery includes components such as a battery case, a positive electrode, a negative electrode, and an electric core. The outer casing of some batteries is made of a metal material. For example, the battery case and the positive electrode are respectively connected to two ear tabs of the electric core. Therefore, the battery case and the positive electrode can be used as two electrodes of the battery. To prevent the positive electrode and the battery case from short-circuiting due to contact, insulation treatment is required between the positive electrode and the battery case.

[0003] Figure 1 A schematic structural diagram of insulation between a positive electrode and a battery case is shown. It includes an outer insulation part 11 located outside the battery case 10, an inner insulation part 12 located inside the battery case 10, an annular insulation part 14 located between the electrode 13 and the battery case 10, and a conductive sheet 15 connected to the electrode 13. The conductive sheet 15 is connected to the electric core. To ensure the insulation effect, the conductive sheet 15, the electrode 13, and the battery case 10 are isolated by the outer insulation part 11, the inner insulation part 12, and the annular insulation part 14. By riveting both ends of the electrode 13, both ends of the electrode 13 are thickened, thereby achieving limiting and fixing.

[0004] The illustrated insulation structure is relatively complex, with a large number of components, and is relatively difficult to assemble. Moreover, to ensure the insulation effect, the outside of the inner insulation part 12 needs to extend to the periphery of the conductive sheet 15, increasing the occupation of the internal space of the battery and being unfavorable for improving the energy density of the battery.

[0005] Therefore, it is necessary to improve the existing technology to overcome the defects in the existing technology.

[0006] The above content is only used to help understand the technical solution of the present application and does not constitute an admission of the above as the prior art. Summary of the Invention

[0007] The purpose of the present invention is to provide a battery to simplify the insulation structure of its electrodes.

[0008] To achieve the above invention purpose, the present invention provides a battery, including:

[0009] A side frame made of a metal material;

[0010] A fixing ring connected to the side frame and protruding outward from the side frame. The fixing ring is provided with a through hole communicating the inner and outer sides of the side frame; and,

[0011] The electrode assembly includes an electrode post passing through the through hole and an annular insulating ring filled between the inner wall of the through hole and the electrode post.

[0012] Further, the fixing ring and the side frame are integrally formed.

[0013] Further, the wall thicknesses at both ends of the insulating ring along the axial direction of the electrode post are greater than the wall thickness at the middle thereof.

[0014] Further, the inner wall of the through hole includes a first arc portion, a first transition portion, and a second arc portion sequentially arranged along the axial direction of the electrode post. The first arc portion is closer to the inner surface of the side frame than the second arc portion. The first arc portion protrudes toward the side where the electrode post is located, and the second arc portion recesses away from the side where the electrode post is located.

[0015] Further, the first arc portion is connected to the inner surface of the side frame, and the second arc portion is connected to the end face of the fixing ring.

[0016] Further, the outer wall of the electrode post includes a first inclined portion, a second transition portion, and a second inclined portion sequentially arranged along the axial direction of the electrode post. The cross-sectional area of the electrode post gradually increases toward the side where the second transition portion is located. The positions of the first inclined portion, the second transition portion, and the second inclined portion respectively correspond to the first arc portion, the first transition portion, and the second arc portion.

[0017] Further, the minimum distance between the first transition portion and the second transition portion is not less than 0.2 mm.

[0018] Further, the angle α1 between the first inclined portion and the axis of the electrode post is 3° to 45°, and the angle α2 between the second inclined portion and the axis of the electrode post is 3° to 45°.

[0019] Further, the electrode post includes an inner connection portion for connecting with the ear of the battery cell and an outer connection portion for connecting with an external electrical device. The inner connection portion extends beyond the inner surface of the side frame, and the outer connection portion extends beyond the end face of the fixing ring.

[0020] Further, the end face of the fixing ring is inclined relative to the axis of the electrode post, and its cross-sectional area gradually increases toward the outside of the side frame.

[0021] Further, the outer surface of the outer connection portion is parallel to the axis of the electrode post; or,

[0022] The outer surface of the outer connection portion is inclined relative to the axis of the electrode post, and its cross-sectional area gradually decreases toward the outside of the side frame.

[0023] Further, the outer surface of the inner connection part is arranged parallel to the axis of the electrode post; or,

[0024] the outer surface of the inner connection part is arranged obliquely with respect to the axis of the electrode post, and its cross-sectional area gradually decreases towards the outside of the side frame.

[0025] Further, the insulating ring is simultaneously filled between the end face of the fixing ring and the electrode post.

[0026] Further, the insulating ring simultaneously covers the outer surface of the part of the fixing ring connected to the end face.

[0027] Further, the side frame is annular, and the battery further includes a cover plate and a bottom plate respectively connected to both ends of the side frame. The cover plate is separately provided from the side frame, and the bottom plate is separately provided from or integrally formed with the side frame.

[0028] Further, the material of the insulating ring is glass;

[0029] the material of the electrode post is molybdenum;

[0030] the material of the side frame is stainless steel.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] According to some embodiments of the present invention, a battery includes a side frame, a fixing ring, and an electrode assembly. The side frame is made of a metal material. The fixing ring is connected to the side frame and protrudes outward from the side frame. The fixing ring is provided with a through hole communicating the inside and outside of the side frame. The electrode assembly includes an electrode post passing through the through hole and an annular insulating ring filled between the inner wall of the through hole and the electrode post. The insulating structure between the electrode post and the side frame is simpler, the number of components is reduced, which is beneficial to cost reduction. At the same time, the part of the electrode assembly located inside the battery is less, which is beneficial to reducing the occupation of the internal space of the battery and improving the energy density of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a cross-sectional schematic view of the electrode insulation structure described in the background art part.

[0034] Figure 2a is a three-dimensional schematic view of the battery in some embodiments of the present invention.

[0035] Figure 2b is Figure 2a the exploded view of the battery shown.

[0036] Figure 3 is Figure 2a the cross-sectional schematic view of the battery shown.

[0037] Figure 4 is Figure 2a A three-dimensional schematic diagram of the middle side frame.

[0038] Figure 5 is Figure 2a An enlarged view of part I in the middle.

[0039] Figure 6 is Figure 2a A sectional schematic diagram at the electrode assembly in the middle.

[0040] Figure 7 A three-dimensional schematic diagram of the electrode post in some embodiments of the present invention.

[0041] Figure 8 A sectional schematic diagram at the electrode assembly in some embodiments of the present invention.

[0042] Figure 9 A sectional schematic diagram at the electrode assembly in some embodiments of the present invention.

[0043] Figure 10 A sectional schematic diagram at the electrode assembly in some embodiments of the present invention.

[0044] Figure 11 A sectional schematic diagram at the electrode assembly in some embodiments of the present invention. Detailed implementation manners

[0045] To make the above objects, features, and advantages of the present application more obvious and understandable, the following will describe the detailed implementation manners of the present application in conjunction with the accompanying drawings. It can be understood that the specific embodiments described herein are only used to explain the present application, rather than limiting the present application. Additionally, it should be noted that for the convenience of description, only parts related to the present application are shown in the drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0046] The terms "including" and "having" in the present application and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0047] References to "embodiments" in this specification mean that the particular features, structures, or characteristics described in connection with the embodiments can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0048] As Figures 2a to 3 shown, some embodiments of the present invention provide a battery, including a side frame 2, a fixing ring 3, and an electrode assembly 4.

[0049] The side frame 2 is made of a metal material and is electrically connected to the tab of the battery cell, and can serve as one electrode of the battery. In some embodiments, as Figure 2a and Figure 3 shown, an electrode sheet 60 is provided outside the side frame 2 and is electrically connected to an external electrical device through the electrode sheet 60. Since the electrode sheet 60 has an increased thickness, it is more convenient for welding.

[0050] As Figure 4 shown, the fixing ring 3 is connected to the side frame 2, protrudes outward from the side frame 2, and is provided with a through hole 30 communicating the inner and outer sides of the side frame 2.

[0051] As Figure 5 and Figure 6 shown, the electrode assembly 4 includes an electrode post 40 passing through the through hole 30 and an annular insulating ring 41 filled between the inner wall of the through hole 30 and the electrode post 40. The electrode post 40 insulates the side frame 2 and the fixing ring 3 through the insulating ring 41, thereby forming insulation. The electrode post 40 is used to connect to the other tab of the battery cell to serve as the other electrode of the battery.

[0052] In some embodiments, the insulating ring 41 is formed by melting an insulating material for filling and then cooling and solidifying. For example, the side frame 2 and the fixing ring 3 can be positioned first, and then the melted insulating material is filled between the side frame 2 and the fixing ring 3. After the insulating material cools, an insulating ring 41 is naturally formed between the side frame 2 and the fixing ring 3, and the insulating ring 41 connects the side frame 2 and the fixing ring 3 at the same time.

[0053] The above-mentioned electrode assembly 4 only includes two components, and the insulating connection structure between the electrode post 40 and the side frame 2 is simpler, with fewer components, which is beneficial to cost reduction. At the same time, the part of the electrode assembly 4 located inside the battery is less, which is beneficial to reducing the occupation of the internal space of the battery and improving the energy density of the battery.

[0054] In some embodiments, the fixing ring 3 is integrally formed with the side frame 2 and is formed by stretching a part of the material of the side frame 2 through a stamping process, rather than being connected to the side frame 2 by an independent fixing ring 3 (such as welding). In this way, the positional accuracy of the fixing ring 3 and the side frame 2 is higher, and the connection strength is better.

[0055] In some embodiments, as Figure 6 shown, the wall thicknesses B1 and B2 at both ends of the insulating ring 41 along the axis 40a of the electrode post 40 are greater than the wall thickness B3 in the middle thereof, so that the connection between the insulating ring 41 and the side frame 2 and the electrode post 40 is more firm, and the insulating ring 41 and the electrode post 40 are not easily separated under force and are more reliable.

[0056] In some embodiments, as Figure 6 shown, the inner wall of the through hole 30 includes a first arc portion 300, a first transition portion 301, and a second arc portion 302 arranged in sequence along the axis 40a of the electrode post 40. The first arc portion 300 is closer to the inner surface 2a of the side frame 2 than the second arc portion 302. The first arc portion 300 protrudes toward the side where the electrode post 40 is located, and the second arc portion 302 is recessed away from the side where the electrode post 40 is located. In this way, after the insulating ring 41 is formed, both ends of the insulating ring 41 are limited by the first arc portion 300 and the second arc portion 302, and are not easily displaced along the axis 40a of the electrode post 40 under force, and are safer and more reliable.

[0057] The outer contours of the longitudinal sections of the first arc portion 300 and the second arc portion 302 are both arc-shaped. The longitudinal section is a section obtained by intercepting the corresponding component with a plane passing through the axis 40a of the electrode post 40.

[0058] Optionally, the first arc portion 300 is connected to the inner surface 2a of the side frame 2, and the insulating ring 41 is flush with the inner surface 2a of the side frame 2 to further reduce the occupation of the internal space of the battery. Further optionally, the second arc portion 302 is connected to the end face 31 of the fixing ring 3, and the first arc portion 300 and the second arc portion 302 are located at both ends of the fixing ring 3, which is more convenient for forming.

[0059] In some embodiments, as Figure 6 and Figure 7 shown, the outer wall of the electrode post 40 includes a first inclined portion 401, a second transition portion 402, and a second inclined portion 403 arranged in sequence along the axis direction of the electrode post 40. The cross-sectional area of the electrode post 40 gradually increases toward the side where the second transition portion 402 is located. The cross-sectional area refers to the area of the section obtained by intercepting the electrode post 40 with a plane perpendicular to the axis 40a of the electrode post 40. In this way, the electrode post 40 has a structure that is thick in the middle and small at both ends. The middle part of the electrode post 40 is larger, and a limit can be formed with the insulating ring 41, so that the electrode post 40 is not easily displaced relative to the insulating ring 41 under force, and is safer and more reliable.

[0060] The outer contours of the longitudinal sections of the first inclined portion 401 and the second inclined portion 403 are both linear.

[0061] The positions of the first inclined portion 401, the second transition portion 402, and the second inclined portion 403 respectively correspond to the first arc portion 300, the first transition portion 301, and the second arc portion 302, so that the insulating ring 41 has a shape with a smaller wall thickness in the middle and larger wall thicknesses at both ends. It can be understood that the larger wall thicknesses at both ends are beneficial to increasing the radial distances between the outer end of the electrode post 40 and the fixing ring 3 and between the inner end of the electrode post 40 and the side frame 4. The radial direction refers to the direction perpendicular to the axis 40a. In this way, it is not easy for the tab or the external wire to contact the electrode post 40 and the side frame 4 or the electrode post 40 and the fixing ring 3 at the same time, and the reliability is better. In addition, the structure with a larger space at both ends of the electrode post 40 and the fixing ring 3 is beneficial to filling the insulating material from the end, and the filling is more convenient.

[0062] Optionally, the outer contour of the longitudinal section of the first transition portion 301 is linear, and the outer contour of the longitudinal section of the second transition portion 402 is arc-shaped.

[0063] In some embodiments, the minimum distance between the first transition portion 301 and the second transition portion 402 is not less than 0.2 mm. On the one hand, it can enable the insulating material to be reliably filled between the electrode post 40 and the fixing ring 3 after melting, preventing poor filling. On the other hand, it is beneficial to ensure the insulation performance between the electrode post 40 and the fixing ring 3. The minimum distance between the first transition portion 301 and the second transition portion 402 is the wall thickness B3 of the middle part of the insulating ring 41.

[0064] In some embodiments, the angle α1 between the first inclined portion 401 and the axis of the electrode post 40 is 3° to 45°, and the angle α2 between the second inclined portion 403 and the axis 40a of the electrode post 40 is 3° to 45°, which is beneficial to guiding the insulating material to be filled when filling the insulating material. Further optionally, the angle α1 is 10° to 15°, and the angle α2 is 10° to 15°.

[0065] Optionally, the angle α1 is equal to the angle α2.

[0066] The outer end of the second arc portion 302 that is recessed away from the side where the electrode post 40 is located shrinks towards the electrode post 40. Therefore, it is also beneficial to prevent the melted insulating material from flowing out of the opening of the fixing ring 3, provide a larger space for accommodating the insulating material, and is beneficial to improving the molding quality.

[0067] In some embodiments, such as Figure 6As shown, the electrode post 40 includes an inner connection portion 400 for connecting with the tab of the battery and an outer connection portion 404 for connecting with an external electrical device. The inner connection portion 400 extends beyond the inner surface 2a of the side frame 2 to facilitate connection with the internal tab, and the outer connection portion 404 extends beyond the end face 31 of the fixing ring 3 to facilitate connection with the external electrical device.

[0068] In some embodiments, the end face 31 of the fixing ring 3 is inclined relative to the axis 40a of the electrode post 40, and its cross-sectional area gradually increases towards the outside of the side frame 2. The cross-sectional area of the end face 31 refers to the area of the cross-section obtained when the end face 31 is intercepted by a plane perpendicular to the axis 40a of the electrode post 40.

[0069] Optionally, as Figure 8 shown, the insulating ring 41 is filled between the end face 31 of the fixing ring 3 and the electrode post 40 at the same time. In this way, it is beneficial to increase the insulation performance between the insulating ring 41 and the electrode post 40, and further improve the connection firmness among the electrode post 40, the insulating ring 41 and the fixing ring 3.

[0070] Further optionally, as Figure 9 shown, the insulating ring 41 covers the outer surface of the part of the fixing ring 3 connected to the end face 31 at the same time, which can further improve the insulation performance and prevent short circuit caused by the external conductor contacting the end face 31 and the electrode post 40 simultaneously.

[0071] In some embodiments, as Figure 6 shown, the outer surface of the outer connection portion 404 is arranged parallel to the axis 40a of the electrode post 40 to provide a relatively larger end area for connecting with the external electrical device, which is convenient for welding with the external wire. In other embodiments, as Figure 10 and Figure 11 shown, the outer surface of the outer connection portion 404 is inclined relative to the axis 40a of the electrode post 40, and its cross-sectional area gradually decreases towards the outside of the side frame 2. In this way, the radial distance between the outer connection portion 404 and the end face 31 is larger, which is beneficial to preventing the conductor from contacting the outer connection portion 404 and the end face 31 simultaneously, thereby improving the insulation effect.

[0072] In some embodiments, as Figure 6 shown, the outer surface of the inner connection portion 400 is arranged parallel to the axis 40a of the electrode post 40 to provide a relatively larger end area for connecting with the internal tab, which is convenient for welding with the tab. In other embodiments, as Figure 10 and Figure 11As shown, the outer surface of the inner connection part 400 is inclined with respect to the axis 40a of the electrode post 40, and its cross-sectional area gradually decreases towards the inside of the side frame 2. In this way, the radial distance between the inner connection part 400 and the inner surface of the side frame 2 is larger, which is conducive to preventing the conductor from contacting the inner connection part 400 and the side frame 2 simultaneously, thereby improving the insulation effect.

[0073] In some embodiments, the side frame 2 is annular. Figure 2a and Figure 2b In the illustrated embodiment, the side frame 2 is rectangular annular. The battery further includes a cover plate 50 and a bottom plate 51 respectively connected to both ends of the side frame 2. The cover plate 50 and the side frame 2 are separately provided, and the bottom plate 51 and the side frame 2 are separately provided or integrally formed. Figure 2a and Figure 2b In the illustrated embodiment, the bottom plate 51 and the side frame 2 are separately provided, which is conducive to eliminating the rounded corners at the connection between the two, increasing the capacity of the battery, and thus improving the energy density.

[0074] In some embodiments, the material of the insulating ring 41 is glass, which has good insulation performance and can be conveniently filled after melting. The material of the electrode post 40 is molybdenum, and the material of the side frame 2 is stainless steel, such as stainless steel 316L, which has good ductility and is more convenient for integrally forming the fixing ring 3. Optionally, the electrode post 40 is the positive electrode of the battery, and the electrode plate 60 is the negative electrode of the battery.

[0075] It should be noted that, without conflict, the embodiments in this article can be combined with each other to obtain more implementation schemes.

[0076] The above are only the specific implementation manners of the present invention, and any improvements made on the premise of the present invention concept are regarded as the protection scope of the present invention.

Claims

1. A battery, characterized in that: include: A side frame (2), wherein the side frame (2) is made of a metal material; a fixing ring (3), the fixing ring (3) being connected to the side frame (2) and protruding outward from the side frame (2), the fixing ring (3) being provided with a through hole (30) communicating with the inner and outer sides of the side frame (2); and, The electrode assembly (4) comprises an electrode column (40) penetrating the through hole (30) and an annular insulating ring (41) filled between the inner wall of the through hole (30) and the electrode column (40).

2. The battery according to claim 1, characterized in that The fixing ring (3) and the side frame (2) are integrally formed.

3. The battery according to claim 1, characterized in that The wall thickness of the insulating ring (41) at both ends along the axial direction of the electrode column (40) is greater than the wall thickness in the middle.

4. The battery according to claim 1, characterized in that The inner wall of the through hole (30) comprises a first arc portion (300), a first transition portion (301) and a second arc portion (302) which are arranged in sequence along the axial direction of the electrode column (40); the first arc portion (300) is closer to the inner surface of the side frame (2) than the second arc portion (302); the first arc portion (300) is convex toward the side where the electrode column (40) is located, and the second arc portion (302) is concave away from the side where the electrode column (40) is located.

5. The battery according to claim 4, characterized in that The first arc portion (300) is connected to the inner surface (2a) of the side frame (2), and the second arc portion (302) is connected to the end surface (31) of the fixing ring (3).

6. The battery according to claim 4, characterized in that The outer wall of the electrode column (40) comprises a first inclined portion (401), a second transition portion (402) and a second inclined portion (403) which are sequentially arranged along the axial direction of the electrode column (40); the cross-sectional area of ​​the electrode column (40) gradually increases toward the side where the second transition portion (402) is located; the positions of the first inclined portion (401), the second transition portion (402) and the second inclined portion (403) respectively correspond to the first circular arc portion (300), the first transition portion (301) and the second circular arc portion (302).

7. The battery according to claim 6, characterized in that The minimum distance between the first transition portion (301) and the second transition portion (402) is not less than 0.2 mm.

8. The battery according to claim 6, characterized in that An included angle α1 between the first inclined portion (401) and the axis of the electrode column (40) is 3° to 45°, and an included angle α2 between the second inclined portion (403) and the axis of the electrode column (40) is 3° to 45°.

9. The battery according to claim 6, characterized in that The electrode column (40) comprises an internal connection portion (400) for connecting to a tab of a battery cell of the battery and an external connection portion (404) for connecting to an external electrical device, wherein the internal connection portion (400) extends beyond the inner surface of the side frame (2), and the external connection portion (404) extends beyond the end surface (31) of the fixing ring (3).

10. The battery according to claim 9, characterized in that The end surface (31) of the fixing ring (3) is arranged obliquely relative to the axis of the electrode column (40), and its cross-sectional area gradually increases toward the outside of the side frame (2).

11. The battery according to claim 10, characterized in that The outer surface of the external connection portion (404) is arranged parallel to the axis of the electrode column (40); or, The outer surface of the external connection portion (404) is arranged obliquely relative to the axis of the electrode column (40), and its cross-sectional area gradually decreases toward the outside of the side frame (2).

12. The battery according to claim 10, characterized in that The outer surface of the inner connecting portion (400) is arranged parallel to the axis of the electrode column (40); or, The outer surface of the inner connecting portion (400) is arranged obliquely relative to the axis of the electrode column (40), and its cross-sectional area gradually decreases toward the outside of the side frame (2).

13. The battery according to claim 10, characterized in that The insulating ring (41) is simultaneously filled between the end surface (31) of the fixing ring (3) and the electrode column (40).

14. The battery according to claim 13, characterized in that The insulating ring (41) also covers the outer surface of the portion of the fixing ring (3) that is connected to the end surface (31).

15. The battery according to any one of claims 1 to 14, characterized in that The side frame (2) is annular in shape, and the battery further comprises a cover plate (50) and a bottom plate (51) respectively connected to two ends of the side frame (2); the cover plate (50) and the side frame (2) are separately arranged, and the bottom plate (51) and the side frame (2) are separately arranged or integrally formed.

16. The battery according to any one of claims 1 to 14, characterized in that The insulating ring (41) is made of glass; The material of the electrode column (40) is molybdenum; The side frame (2) is made of stainless steel.

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