Cylindrical battery

Abstract

The utility model relates to the technical field of batteries, and provides a cylindrical battery which comprises a battery shell, a pole and an insulating part, and the battery shell comprises two end walls which are oppositely arranged along the axial direction of the battery shell; the pole comprises a riveting part, and the pole is riveted on at least one end wall through the riveting part; the insulating part is at least partially arranged between the riveting part and the end wall, a missing part is formed on the insulating part, and the orthographic projection of the riveting part on the plane where the end wall is located and the orthographic projection of the missing part on the plane where the end wall is located at least partially coincide; the area defined by the outer edge of the orthographic projection of the riveting part on the plane where the end wall is located is S1, the area defined by the outer edge of the end wall is S2, and S1 / S2 is 5%-35%. According to the utility model, the insulating part is not easy to break and damage.

Description

Technical Field

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

[0002] In the related art, in order to improve the space utilization of the display device, the cylindrical battery has a larger diameter. However, as the diameter of the cylindrical battery increases, the insulating member between the pole and the battery housing is prone to breakage, resulting in a risk of short circuit between the pole and the battery housing.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0004] The utility model provides a cylindrical battery, which can solve the problem that an insulating member between a pole and a shell is easily broken.

[0005] Cylindrical batteries include:

[0006] A battery housing, the battery housing comprising two end walls arranged opposite to each other along its axial direction;

[0007] A pole, the pole comprising a riveted portion, the pole being riveted to at least one end wall via the riveted portion;

[0008] An insulating member is at least partially disposed between the riveted portion and the end wall, a missing portion is formed on the insulating member, and an orthographic projection of the riveted portion on the plane where the end wall is located and an orthographic projection of the missing portion on the plane where the end wall is located at least partially overlap;

[0009] The area enclosed by the outer edge of the orthographic projection of the riveted portion on the plane where the end wall is located is S1, the area enclosed by the outer edge of the end wall is S2, and S1 / S2 is 5%-35%.

[0010] In the related art, in order to improve the overall space utilization and energy density inside a single battery, the diameter of cylindrical batteries is getting larger and larger. Large-diameter batteries require poles with larger flow areas to meet the battery flow and improve the fixing strength of the poles and battery shells. Large poles require correspondingly larger riveted parts. However, if the size of the riveted parts is too large, the risk of deformation of the battery shell will increase. At the same time, in the process of riveting the poles to the shell, the insulating parts arranged between the riveted parts and the battery shell are prone to serious deformation. The utility model forms a missing part on the insulating part, and stress is released through the missing part, so as to avoid the riveted part from crushing the insulating part, thereby reducing the risk of insulation failure of the poles and the battery shell.

[0011] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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.

[0013] in:

[0014] Figure 1 It is a structural schematic diagram of an exemplary embodiment of a cylindrical battery disclosed in the present invention;

[0015] Figure 2 for Figure 1 An enlarged view of a local area AA of the battery is shown;

[0016] Figure 3 for Figure 1 A partial cross-sectional view of the cylindrical battery shown along the axial direction;

[0017] Figure 4 This is a schematic structural diagram of an insulating member in an exemplary embodiment of a cylindrical battery disclosed herein;

[0018] Figure 5 A partial cross-sectional view along the axial direction of another exemplary embodiment of a cylindrical battery disclosed in the present invention;

[0019] Figure 6 It is a schematic structural diagram of an insulating member in another exemplary embodiment of a cylindrical battery disclosed in the present invention;

[0020] Figure 7 A partial cross-sectional view along the axial direction of another exemplary embodiment of a cylindrical battery disclosed in the present invention;

[0021] Figure 8 It is a schematic structural diagram of an insulating member in another exemplary embodiment of a cylindrical battery disclosed in the present invention;

[0022] Fig. 9 It is a schematic structural diagram of an insulating member in another exemplary embodiment of a cylindrical battery disclosed in the present invention;

[0023] Fig.10 It is a schematic structural diagram of an insulating member in another exemplary embodiment of a cylindrical battery disclosed in the present invention.

[0024] Description of reference numerals:

[0025] 1. Battery housing; 11. End wall; 2. Post; 21. Riveted part; 3. Insulator; 4. Missing part; 5. Sealing part. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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 one or more "upper", "lower", or "inner", "outer" of another element, it can not only be directly connected to the "upper", "lower", "inner", "outer" of another element or elements, but can also be indirectly connected to the "upper", "lower", "inner", "outer" of another element or elements through an intermediate element.

[0030] like Figure 1 , 2 , 3, and 4, Figure 1 This is a schematic structural diagram of an exemplary embodiment of a cylindrical battery disclosed in the present invention. Figure 2 for Figure 1 The enlarged view of the local area AA of the battery is shown. Figure 3 for Figure 1 The partial cross-sectional view of the cylindrical battery along the axial direction is shown. Figure 4It is a schematic diagram of the structure of an insulating member in an exemplary embodiment of a cylindrical battery disclosed in the present invention.

[0031] The cylindrical battery comprises: a battery case 1, a pole 2, and an insulating member 3, wherein the battery case 1 comprises two end walls 11 arranged opposite to each other along its axial direction X; the pole 2 comprises a riveted portion 21, and the pole 2 is riveted to the end wall 11 through the riveted portion 21; the insulating member 3 is at least partially arranged between the riveted portion 21 and the end wall, and a missing portion 4 is formed on the insulating member 3, and the orthographic projection of the riveted portion 21 on the plane where the end wall 11 is located and the orthographic projection of the missing portion 4 on the plane where the end wall 11 is located at least partially overlap; the area enclosed by the outer edge of the orthographic projection of the riveted portion 21 on the plane where the end wall is located is S1, and the area enclosed by the outer edge of the end wall is S2, and S1 / S2 is 5%-35%.

[0032] In the related art, in order to improve the overall space utilization and energy density inside a single battery, the diameter of cylindrical batteries is getting larger and larger. Large-diameter batteries require poles with larger flow areas to meet the battery flow and improve the fixing strength of the poles and battery shells. Large poles require correspondingly larger riveted parts. However, if the size of the riveted parts is too large, the risk of deformation of the battery shell will increase. At the same time, in the process of riveting the poles to the shell, the insulating parts arranged between the riveted parts and the battery shell are prone to serious deformation. In this exemplary embodiment, a missing part 4 is formed on the insulating part 3. When the pole 2 and the battery shell 1 squeeze the insulating part 3, the insulating part 3 can release stress through the missing part 4, thereby reducing the risk of the insulating part 3 breaking.

[0033] The orthographic projection of the riveted portion 21 on the plane where the end wall 11 is located and the orthographic projection of the missing portion 4 on the plane where the end wall 11 is located at least partially overlap, so that the riveted portion 21 can be directly pressed against the missing portion 4, and the missing portion 4 can greatly release the stress of the insulating member 3.

[0034] In this exemplary embodiment, the missing portion 4 may be a groove, a through hole, a notch or the like.

[0035] In this exemplary embodiment, the size of the missing portion 4 in the radial direction Y of the cylindrical battery is L1, and the ratio of L1 to the diameter of the cylindrical battery is 0.005-0.1. For example, the ratio of L1 to the diameter of the cylindrical battery can be equal to 0.005, 0.006, 0.007, 0.008, 0.009, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.09, 0.1, etc. Among them, if the ratio of L1 to the diameter of the cylindrical battery is too small, the gas production of the large-sized battery will affect the connection strength between the pole and the battery shell, and the insulating part is easy to break and collapse; if the ratio of L1 to the diameter of the cylindrical battery is too large, the insulating part itself is weak in strength, which is easy to cause the risk of insulation failure between the pole and the battery shell.

[0036] In this exemplary embodiment, S1 / S2 can be equal to 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 35%, etc.

[0037] In this exemplary embodiment, the diameter of the end wall 11 can be greater than or equal to 38mm, and accordingly, S1 / S2≤34.5%. The diameter of the battery housing 1 can be equal to 38mm, 39mm, 40mm, 41mm, 42mm, 43mm, 44mm, 45mm, 46mm, 47mm, 48mm, 49mm, 50mm, 51mm, 52mm, 53mm, 54mm, 55mm, 56mm, 57mm, 58mm, 59mm, 60mm, 61mm, 62mm, 63mm, 64mm, 65mm, 66mm, 67mm, 68mm, 69mm, 70mm, 75mm, 80mm, 85mm, 90mm, 95mm, 100mm, etc. S1 / S2 can be equal to 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34%, 34.5%, etc.

[0038] like Figure 1-4 As shown, the missing portion 4 may include a notch formed on the insulating member 3. This arrangement can facilitate the molding of the missing portion 4. The notch is a missing portion having a plurality of adjacent openings.

[0039] It should be understood that in other exemplary embodiments, the missing portion 4 may also include other structures, for example, Figure 5 , 6 , Figure 5 FIG. 1 is a partial cross-sectional view along the axial direction of another exemplary embodiment of a cylindrical battery disclosed in the present invention. Figure 6 Schematic diagram of the structure of the insulating member in another exemplary embodiment of the cylindrical battery disclosed in the present invention. The missing portion 4 may also include an opening formed on the insulating member 3. The opening forming the missing portion 4 may extend along the axial direction X of the cylindrical battery, and the opening of the axial opening may be arranged toward the end wall 11 or toward the riveted portion 21. For another example, Figure 7 , 8 , Figure 7 FIG. 1 is a partial cross-sectional view along the axial direction of another exemplary embodiment of a cylindrical battery disclosed in the present invention. Figure 8Schematic diagram of the structure of the insulating member in another exemplary embodiment of the cylindrical battery disclosed in the present invention. The opening forming the missing portion 4 may also extend along the radial direction Y of the cylindrical battery, and the opening of the radial opening may be arranged toward the outer periphery of the insulating member 3 or toward the inner periphery of the insulating member 3.

[0040] like Figure 5-8 As shown, the axial opening or radial opening used to form the missing portion 4 can be a through hole or a blind hole.

[0041] In this exemplary embodiment, Figure 1-8 As shown, the size of the missing portion 4 in the radial direction of the cylindrical battery is L1, the size of the insulating member 3 in the radial direction of the cylindrical battery is L2, and L1 / L2 is 0.1-0.98. For example, L1 / L2 can be equal to 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.98, etc. If L1 / L2 is too small, L1 is too small, the effect of the insulating member 3 releasing stress through the missing portion 4 is not obvious, and the insulating member 3 still has the risk of breaking; if L1 / L2 is too large, L1 is too large, the overall strength of the insulating member 3 is insufficient, and the insulating member 3 still has the risk of breaking. This exemplary embodiment sets L1 / L2 to a suitable size, which can effectively reduce the risk of breaking of the insulating member 3.

[0042] In this exemplary embodiment, Figure 1-8 As shown, the size of the missing portion 4 in the axial direction of the cylindrical battery is L3, the size of the insulating member 3 in the axial direction of the cylindrical battery is L4, and L3 / L4 is 0.2-0.9. For example, L3 / L4 can be equal to 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, etc. If L3 / L4 is too small, L3 is too small, the effect of the insulating member 3 releasing stress through the missing portion 4 is not obvious, and the insulating member 3 still has the risk of breaking; if L3 / L4 is too large, L3 is too large, the overall strength of the insulating member 3 is insufficient, and the insulating member 3 still has the risk of breaking. This exemplary embodiment sets L3 / L4 to a suitable size, which can effectively reduce the risk of breaking of the insulating member 3.

[0043] In this exemplary embodiment, Fig. 9 As shown in FIG. 1 , it is a schematic diagram of the structure of the insulating member in another exemplary embodiment of the cylindrical battery disclosed in the present invention. The missing portion 4 can be arranged to penetrate the insulating member 3 in the axial direction of the cylindrical battery. Fig.10 FIG. 4 is a schematic diagram of the structure of an insulating member in another exemplary embodiment of a cylindrical battery disclosed in the present invention. The missing portion 4 can also be arranged to penetrate the insulating member 3 in the radial direction of the cylindrical battery. Fig. 9 , Fig.10 The setting can greatly increase the effect of releasing stress of the missing part 4.

[0044] In this exemplary embodiment, Figure 1-10As shown, the elastic modulus of the insulating member 3 is less than or equal to 4500MPa. For example, the elastic modulus of the insulating member 3 can be equal to 4500MPa, 4000MPa, 3500MPa, 3000MPa, 2500MPa, 2000MPa, etc. If the elastic modulus of the insulating member 3 is too large, the insulating member 3 is not easy to deform, and the insulating member 3 is easy to break when the battery housing 1 and the riveted portion 21 squeeze the insulating member 3. In this exemplary embodiment, the elastic modulus of the insulating member 3 is set to a suitable size, which can further reduce the risk of the insulating member 3 breaking.

[0045] In this exemplary embodiment, Figure 1-10 As shown, the riveted portion 21 can be located outside the battery housing 1. This arrangement allows the insulating member 3 to also be located outside the battery housing, thereby preventing the insulating member 3 from being corroded by the electrolyte inside the battery, thereby reducing the risk of damage to the insulating member 3 at the position of the missing portion 4, and improving the insulation performance of the pole and the battery housing. In addition, the insulating member 3 located outside the battery housing also has an aging risk. The missing portion in this exemplary embodiment can reduce the risk of the insulating member 3 being easily crushed due to aging. At the same time, in order to facilitate the subsequent grouping of cylindrical batteries, the thickness of the riveted portion 21 in the axial direction of the cylindrical battery is relatively large. Accordingly, the stress of the riveted portion 21 on the insulating member 3 is relatively large, and the above-mentioned missing portion can release the stress of the insulating member 3.

[0046] In this exemplary embodiment, Figure 1-10 As shown, the cylindrical battery also includes a seal 5, which is arranged between the end wall 11 and the pole 2 riveted to the end wall 11; the orthographic projection of the seal 5 on the maximum side of the end wall 11 and the orthographic projection of the insulating member 3 on the maximum side of the end wall 11 at least partially overlap, and the size of the missing portion 4 in the radial direction of the cylindrical battery is less than or equal to 5mm. For example, the size of the missing portion 4 in the radial direction Y of the cylindrical battery can be equal to 1mm, 2mm, 3mm, 4mm, 5mm, etc. The seal 5 is generally made of rubber material, and the seal 5 has a certain elasticity so that it can be compressed to seal the end wall and the pole. The gas generated inside the battery will squeeze the seal 5, causing the seal to expand and deform, and then squeeze the insulating member, causing the insulating member to deform or the seal position to move, causing the seal to fail. In this exemplary embodiment, the size of the missing portion 4 in the radial direction Y of the cylindrical battery is set to be smaller, so that the strength of the insulating member can be improved, thereby improving the assembly stability between the insulating member and the seal, and reducing the risk of failure of the insulating member and the seal.

[0047] In this exemplary embodiment, Figure 1-4 As shown, the opening of the missing portion 4 can be formed on the side of the insulating member 3 facing the end wall 11. This arrangement can prevent the rivet portion 21 from directly squeezing the missing portion 4, thereby reducing the risk of the insulating member 3 being crushed, while increasing the contact area between the rivet portion and the insulating member and reducing the riveting pressure of the rivet portion on the insulating member.

[0048] In this exemplary embodiment, Figure 1-10 As shown, the insulating member 3 formed with the missing portion 4 can be a continuous annular structure, that is, the insulating member 3 is not disconnected at the position of the missing portion 4. This arrangement can make the end wall 11 and the riveted portion 21 insulated by the insulating member 3 at all positions. The insulating member 3 can be set to a circular ring structure, a square ring structure, etc. according to the shape of the pole.

[0049] In this exemplary embodiment, a plurality of missing portions 4 are formed on the insulating member 3. The insulating member 3 can release stress at different positions through the plurality of missing portions 4. Figure 1-10 As shown, two missing portions 4 are formed on the insulating member 3 . It should be understood that in other exemplary embodiments, the number of missing portions 4 on the insulating member 3 may be other.

[0050] In this exemplary embodiment, Figure 1-10 As shown, at least two of the multiple missing parts 4 are symmetrically arranged about the axis of the cylindrical battery. The two missing parts 4 symmetrically arranged about the axis of the cylindrical battery can balance the stress release effect of different positions of the insulating member 3.

[0051] In this exemplary embodiment, the battery may be a lithium-ion battery. It should be understood that in other exemplary embodiments, the battery may also be a nickel-cadmium battery, a nickel-metal hydride battery, a lithium polymer battery, or the like.

[0052] In this exemplary embodiment, the battery may be a cylindrical battery, and the battery case of the cylindrical battery may include two circular end surfaces and a curved surface located between the two circular end surfaces.

[0053] 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.

[0054] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing what is disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary technical means in the art that are not disclosed in the present disclosure. The specification and embodiments are to be considered merely as exemplary, and the true scope and spirit of the present disclosure are indicated by the claims.

[0055] The drawings in the present disclosure only relate to the structures involved in the present disclosure, and other structures may refer to the usual design. In the absence of conflict, the embodiments of the present disclosure and the features in the embodiments may be combined with each other to obtain new embodiments. It should be understood by those of ordinary skill in the art that the technical solutions of the present disclosure may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present disclosure, and should be included in the scope of the claims of the present disclosure.

[0056] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A cylindrical battery, characterized in that: The cylindrical battery comprises: A battery housing (1), the battery housing (1) comprising two end walls (11) arranged opposite to each other along its axial direction; A pole (2), the pole (2) comprising a riveted portion (21), the pole (2) being riveted to at least one of the end walls (11) via the riveted portion (21); an insulating member (3) at least partially disposed between the riveted portion (21) and the end wall (11), a missing portion (4) being formed on the insulating member (3), and an orthographic projection of the riveted portion (21) on the plane where the end wall (11) is located and an orthographic projection of the missing portion (4) on the plane where the end wall (11) is located at least partially overlapping; The area enclosed by the outer edge of the orthographic projection of the riveted portion (21) on the plane where the end wall (11) is located is S1, the area enclosed by the outer edge of the end wall (11) is S2, and S1 / S2 is 5%-35%.

2. The cylindrical battery according to claim 1, characterized in that: The diameter of the end wall (11) is greater than or equal to 38 mm, and S1 / S2≤34.5%.

3. The cylindrical battery according to claim 1, characterized in that: The missing portion (4) comprises a notch formed on the insulating member (3).

4. The cylindrical battery according to claim 1, characterized in that: The missing portion (4) comprises an opening formed on the insulating member (3).

5. The cylindrical battery according to any one of claims 1 to 4, characterized in that: The dimension of the missing portion (4) in the radial direction of the cylindrical battery is L1, and the ratio of L1 to the diameter of the cylindrical battery is 0.005-0.

1.

6. The cylindrical battery according to any one of claims 1 to 4, characterized in that: The dimension of the missing portion (4) in the radial direction of the cylindrical battery is L1, the dimension of the insulating member (3) in the radial direction of the cylindrical battery is L2, and L1 / L2 is 0.1-0.

98.

7. The cylindrical battery according to any one of claims 1 to 4, characterized in that: The dimension of the missing portion (4) in the axial direction of the cylindrical battery is L3, the dimension of the insulating member (3) in the axial direction of the cylindrical battery is L4, and L3 / L4 is 0.2-0.

9.

8. The cylindrical battery according to any one of claims 1 to 4, characterized in that: The elastic modulus of the insulating member (3) is less than or equal to 4500 MPa.

9. The cylindrical battery according to any one of claims 1 to 4, characterized in that: The missing portion (4) is arranged to penetrate the insulating member (3) in the axial direction of the cylindrical battery; Alternatively, the missing portion (4) is arranged to penetrate the insulating member (3) in the radial direction of the cylindrical battery.

10. The cylindrical battery according to any one of claims 1 to 4, characterized in that: The riveting portion (21) is located outside the battery housing (1).

11. The cylindrical battery according to claim 10, characterized in that: The opening of the missing portion (4) is formed on a side of the insulating member (3) facing the end wall (11).

12. The cylindrical battery according to claim 10, characterized in that: The cylindrical battery further comprises a sealing member (5), wherein the sealing member (5) is arranged between the end wall (11) and a pole (2) riveted to the end wall (11); The orthographic projection of the sealing member (5) on the maximum side surface of the end wall (11) and the orthographic projection of the insulating member (3) on the maximum side surface of the end wall (11) at least partially overlap, and the dimension of the missing portion (4) in the radial direction of the cylindrical battery is less than or equal to 5 mm.

13. The cylindrical battery according to any one of claims 1 to 4, characterized in that: A plurality of missing portions (4) are formed on the insulating member (3).

14. The cylindrical battery according to claim 13, characterized in that: At least two of the plurality of missing parts (4) are symmetrically arranged about the axis of the cylindrical battery.

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