Battery

Abstract

The utility model discloses a battery, which relates to the technical field of batteries and comprises a side frame, a fixing ring and an electrode assembly, the side frame is made of metal materials, 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 communicated with 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] This utility model relates to the field of battery manufacturing technology, and in particular to a battery. Background Technology

[0002] A battery consists of components such as a battery casing, a positive electrode, a negative electrode, and a battery cell. Some batteries have casings made of metal; for example, the battery casing and the positive electrode are connected to the two tabs of the battery cell, thus the battery casing and the positive electrode can be used as the two electrodes of the battery. To prevent a short circuit due to contact between the positive electrode and the battery casing, insulation is required between them.

[0003] Figure 1 A schematic diagram of a structure for insulating a positive electrode and a battery casing is shown. It includes an outer insulating portion 11 located outside the battery casing 10, an inner insulating portion 12 located inside the battery casing 10, an annular insulating portion 14 located between the electrode 13 and the battery casing 10, and a conductive sheet 15 connected to the electrode 13. The conductive sheet 15 is connected to the battery cell. To ensure insulation, the conductive sheet 15, the electrode 13, and the battery casing 10 are isolated by the outer insulating portion 11, the inner insulating portion 12, and the annular insulating portion 14. The ends of the electrode 13 are thickened by riveting, thereby achieving positioning and fixation.

[0004] The insulation structure shown in the figure is relatively complex, with a large number of parts, making assembly relatively difficult. Moreover, in order to ensure the insulation effect, the inner insulation part 12 needs to extend to the periphery of the conductive sheet 15, which increases the space occupied inside the battery and is not conducive to improving the energy density of the battery.

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

[0006] The above content is only used to help understand the technical solution of this application and does not constitute an admission that the above is prior art. Utility Model Content

[0007] The purpose of this invention is to provide a battery that simplifies the insulation structure of its electrodes.

[0008] To achieve the above-mentioned objectives, this utility model proposes a battery, comprising:

[0009] Side frame, the side frame being made of metal material;

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

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

[0012] Furthermore, the fixing ring is integrally formed with the side frame.

[0013] Furthermore, the wall thickness at both ends of the insulating ring along the axial direction of the electrode post is greater than the wall thickness at its middle portion.

[0014] Furthermore, the inner wall of the through hole includes a first arc portion, a first transition portion, and a second arc portion arranged sequentially 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 is recessed away from the side where the electrode post is located.

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

[0016] Furthermore, the outer wall of the electrode post includes a first inclined portion, a second transition portion, and a second inclined portion arranged sequentially along the axial direction of the electrode post. The cross-sectional area of ​​the electrode post gradually increases towards 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 correspond to the first arc portion, the first transition portion, and the second arc portion, respectively.

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

[0018] Furthermore, 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] Furthermore, the electrode post includes an inner connection portion for connecting to the tab of the battery cell and an outer connection portion for connecting to 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 retaining ring.

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

[0021] Furthermore, the outer surface of the external connecting portion is arranged parallel to the axis of the electrode post; or,

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

[0023] Furthermore, the outer surface of the inner connecting portion is arranged parallel to the axis of the electrode post; or,

[0024] The outer surface of the inner connecting part is inclined relative to the axis of the electrode post, and its cross-sectional area gradually decreases towards the outside of the side frame.

[0025] Furthermore, the insulating ring simultaneously fills the space between the end face of the fixing ring and the electrode post.

[0026] Furthermore, the insulating ring also covers the outer surface of the portion of the fixed ring that is connected to the end face.

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

[0028] Furthermore, the insulating ring is made of glass;

[0029] The electrode post is made of molybdenum;

[0030] The side frame is made of stainless steel.

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

[0032] According to some embodiments of this utility model, the battery includes a side frame, a fixing ring, and an electrode assembly. The side frame is made of metal material, and the fixing ring is connected to the side frame and protrudes outward from the side frame. The fixing ring has a through hole connecting the inner and outer sides of the side frame. The electrode assembly includes an electrode post passing through the through hole and an annular insulating ring filling the inner wall of the through hole and the electrode post. The insulation structure between the electrode post and the side frame is simpler, reducing the number of parts and helping to reduce costs. At the same time, the portion of the electrode assembly located inside the battery is smaller, which helps to reduce the space occupied inside the battery and improve the energy density of the battery. Attached Figure Description

[0033] Figure 1 This is a cross-sectional schematic diagram of the electrode insulation structure described in the background section.

[0034] Figure 2a This is a three-dimensional schematic diagram of a battery according to some embodiments of this utility model.

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

[0036] Figure 3 yes Figure 2a The diagram shows a cross-sectional view of the battery.

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

[0038] Figure 5 yes Figure 2a Enlarged view of section I in the middle.

[0039] Figure 6 yes Figure 2a A cross-sectional view of the middle electrode assembly.

[0040] Figure 7 This is a three-dimensional schematic diagram of the electrode posts in some embodiments of this utility model.

[0041] Figure 8 This is a cross-sectional schematic diagram of the electrode assembly in some embodiments of this utility model.

[0042] Figure 9 This is a cross-sectional schematic diagram of the electrode assembly in some embodiments of this utility model.

[0043] Figure 10 This is a cross-sectional schematic diagram of the electrode assembly in some embodiments of this utility model.

[0044] Figure 11 This is a cross-sectional schematic diagram of the electrode assembly in some embodiments of this utility model. Detailed Implementation

[0045] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0046] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0047] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0048] like Figures 2a to 3 As shown, some embodiments of this utility model propose a battery, including a side frame 2, a fixing ring 3, and an electrode assembly 4.

[0049] The side frame 2 is made of metal and is electrically connected to the electrode tabs of the battery cell, serving as one electrode of the battery. In some embodiments, such as Figure 2a and Figure 3 As shown, an electrode plate 60 is provided on the outside of the side frame 2. The electrode plate 60 is electrically connected to the external electrical device. Since the electrode plate 60 has increased thickness, it is easier to weld.

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

[0051] like Figure 5 and Figure 6 As shown, the electrode assembly 4 includes an electrode post 40 passing through the through hole 30 and an annular insulating ring 41 filling the space between the inner wall of the through hole 30 and the electrode post 40. The electrode post 40 is separated from the side frame 2 and the fixing ring 3 by 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, an insulating ring 41 is formed by melting and filling the insulating material and then cooling and solidifying it. For example, the side frame 2 and the fixing ring 3 can be positioned first, and then the molten insulating material can be filled between the side frame 2 and the fixing ring 3. After the insulating material cools, the 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.

[0053] The electrode assembly 4 described above consists of only two components. The insulation connection structure between the electrode post 40 and the side frame 2 is simpler, and the number of components is smaller, which helps to reduce costs. At the same time, the portion of the electrode assembly 4 located inside the battery is smaller, which helps to reduce the space occupied inside the battery and improve the energy density of the battery.

[0054] In some embodiments, the retaining ring 3 is integrally formed with the side frame 2, and is extended by a stamping and stretching process of a portion of the material of the side frame 2, rather than being connected to the side frame 2 by a separate retaining ring 3 (e.g., by welding). In this way, the positional accuracy of the retaining ring 3 and the side frame 2 is higher, and the connection strength is better.

[0055] In some embodiments, such as Figure 6 As 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, so that the connection between the insulating ring 41 and the side frame 2 and the electrode post 40 is more secure, and the insulating ring 41 and the electrode post 40 are less likely to fall off under force, making it more reliable.

[0056] In some embodiments, such as Figure 6 As 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 sequentially 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 towards the side where the electrode post 40 is located, while 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, making it less likely to shift along the axis 40a of the electrode post 40 after being subjected to force, thus making it 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, and the longitudinal section is a section obtained by cutting 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, so as to further reduce the space occupied inside the battery. Further optionally, the second arc portion 302 is connected to the end face 31 of the fixing ring 3, with the first arc portion 300 and the second arc portion 302 located at both ends of the fixing ring 3, which facilitates molding.

[0059] In some embodiments, such as Figure 6 and Figure 7 As 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 sequentially along the axial direction of the electrode post 40. The cross-sectional area of ​​the electrode post 40 gradually increases towards the side where the second transition portion 402 is located. The cross-sectional area refers to the area of ​​the cross section obtained by cutting the electrode post 40 through a plane perpendicular to the axis 40a of the electrode post 40. In this way, the electrode post 40 has a structure that is thicker in the middle and smaller at both ends. The middle part of the electrode post 40 is larger and can form a limiting relationship with the insulating ring 41, making it less likely for the electrode post 40 to move relative to the insulating ring 41 after being subjected to force, thus making it 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 straight.

[0061] The positions of the first inclined portion 401, the second transition portion 402, and the second inclined portion 403 correspond to the first arc portion 300, the first transition portion 301, and the second arc portion 302, respectively, so that the insulating ring 41 has a shape with a thinner wall in the middle and a thicker wall at both ends. It is understood that the thicker wall at both ends helps to increase the radial distance 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. Radial distance refers to the direction perpendicular to the axis 40a. This makes it less likely that the electrode tab or external wire will simultaneously contact the electrode post 40 and the side frame 4, or simultaneously contact the electrode post 40 and the fixing ring 3, resulting in better reliability. Furthermore, the larger space at both ends of the electrode post 40 and the fixing ring 3 facilitates filling the insulating material from the ends, making the filling process more convenient.

[0062] Optionally, the outer contour of the longitudinal section of the first transition portion 301 is straight, 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. This ensures that the insulating material, after melting, reliably fills the space between the electrode post 40 and the fixing ring 3, preventing poor filling. It also helps to guarantee 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 portion 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 for guiding the insulating material during filling. Further optionally, the angle α1 is 10° to 15°, and the angle α2 is 10° to 15°.

[0065] Optionally, the included angle α1 and included angle α2 are equal.

[0066] The outer end of the second arc portion 302, which is recessed towards the side away from the electrode post 40, contracts toward the electrode post 40. Therefore, it also helps to prevent the molten insulating material from flowing out of the opening of the fixing ring 3, provides a larger space to accommodate the insulating material, and helps to improve the molding quality.

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

[0068] In some embodiments, the end face 31 of the retaining 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 cut with a plane perpendicular to the axis 40a of the electrode post 40.

[0069] Optional, such as Figure 8 As shown, the insulating ring 41 fills the space between the end face 31 of the fixing ring 3 and the electrode post 40. This helps to increase the insulation performance between the insulating ring 41 and the electrode post 40, and further improves the firmness of the connection between the electrode post 40, the insulating ring 41 and the fixing ring 3.

[0070] Further optional, such as Figure 9 As shown, the insulating ring 41 simultaneously covers the outer surface of the part where the fixing ring 3 is connected to the end face 31, which can further improve the insulation performance and prevent the external conductor from short-circuiting due to simultaneous contact with the end face 31 and the electrode post 40.

[0071] In some embodiments, such as Figure 6 As shown, the outer surface of the external connection portion 404 is arranged parallel to the axis 40a of the electrode post 40 to provide a relatively larger end area for connection to external electrical devices, facilitating soldering with external wires. In other embodiments, such as Figure 10 and Figure 11 As shown, the outer surface of the external connecting part 404 is inclined 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 external connecting part 404 and the end face 31 is larger, which helps to prevent the conductor from contacting the external connecting part 404 and the end face 31 at the same time, thereby improving the insulation effect.

[0072] In some embodiments, such as Figure 6 As 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 connection with the inner tab, facilitating soldering to the tab. In other embodiments, such as Figure 10 and Figure 11As shown, the outer surface of the inner connection portion 400 is inclined to the axis 40a of the electrode post 40, and its cross-sectional area gradually decreases towards the interior of the side frame 2. In this way, the radial distance between the inner connection portion 400 and the inner surface of the side frame 2 is larger, which helps to prevent the conductor from contacting the inner connection portion 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. The battery also 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 disposed, and the bottom plate 51 and the side frame 2 are separately disposed or integrally formed. Figure 2a and Figure 2b In the illustrated embodiment, the base plate 51 and the side frame 2 are separate components, which helps to eliminate the rounded corners at the connection between the two, increase the battery capacity, and thus improve the energy density.

[0074] In some embodiments, the insulating ring 41 is made of glass, which has good insulation properties and can be easily filled after melting. The electrode post 40 is made of molybdenum, and the side frame 2 is made of stainless steel, such as 316L stainless steel, which has good ductility and is easier to integrally mold into the fixing ring 3. Optionally, the electrode post 40 is the positive electrode of the battery, and the electrode sheet 60 is the negative electrode of the battery.

[0075] It should be noted that, in the absence of conflict, the various embodiments described herein can be combined with each other to obtain more implementation schemes.

[0076] The above are merely specific embodiments of this utility model. Any improvements made based on the concept of this utility model shall be considered within the scope of protection of this utility model.

Claims

1. A battery, characterized in that, include: Side frame (2), said side frame (2) is made of metal material; A fixing ring (3) is connected to the side frame (2) and protrudes outward from the side frame (2). The fixing ring (3) has a through hole (30) connecting the inner and outer sides of the side frame (2). The electrode assembly (4) includes an electrode post (40) passing through the through hole (30) and an annular insulating ring (41) filling the space between the inner wall of the through hole (30) and the electrode post (40).

2. The battery as described in claim 1, characterized in that, The fixing ring (3) is integrally formed with the side frame (2).

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

4. The battery as described in claim 1, characterized in that, 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 sequentially along the axial direction of the electrode post (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) 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.

5. The battery as described in 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 face (31) of the fixing ring (3).

6. The battery as described in claim 4, characterized in that, 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 sequentially along the axial direction of the electrode post (40). The cross-sectional area of ​​the electrode post (40) gradually increases towards 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) correspond to the first arc portion (300), the first transition portion (301), and the second arc portion (302), respectively.

7. The battery as described in 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 as described in claim 6, characterized in that, 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 of the electrode post (40) is 3° to 45°.

9. The battery as claimed in claim 6, characterized in that, The electrode post (40) includes an inner connection portion (400) for connecting to the tabs of the battery cell and an outer connection portion (404) for connecting to an external electrical device. The inner connection portion (400) extends beyond the inner surface of the side frame (2), and the outer connection portion (404) extends beyond the end face (31) of the retaining ring (3).

10. The battery as claimed in claim 9, characterized in that, The end face (31) of the fixing ring (3) is inclined relative to the axis of the electrode post (40), and its cross-sectional area gradually increases towards the outside of the side frame (2).

11. The battery as claimed in claim 10, characterized in that, The outer surface of the external connecting part (404) is arranged parallel to the axis of the electrode post (40); or, The outer surface of the outer connecting part (404) is inclined relative to the axis of the electrode post (40), and its cross-sectional area gradually decreases towards the outside of the side frame (2).

12. The battery as claimed in claim 10, characterized in that, The outer surface of the inner connecting part (400) is arranged parallel to the axis of the electrode post (40); or, The outer surface of the inner connecting part (400) is inclined relative to the axis of the electrode post (40), and its cross-sectional area gradually decreases towards the outside of the side frame (2).

13. The battery as claimed in claim 10, characterized in that, The insulating ring (41) is simultaneously filled between the end face (31) of the fixing ring (3) and the electrode post (40).

14. The battery as claimed in claim 13, characterized in that, The insulating ring (41) also covers the outer surface of the part of the fixed ring (3) that is connected to the end face (31).

15. The battery according to any one of claims 1 to 14, characterized in that, The side frame (2) is ring-shaped. The battery also includes a cover plate (50) and a bottom plate (51) respectively connected to both ends of the side frame (2). The cover plate (50) is separately disposed from the side frame (2), and the bottom plate (51) is separately disposed from the side frame (2) 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 electrode post (40) is made of molybdenum; The side frame (2) is made of stainless steel.

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