Battery casing assembly and individual cells

Abstract

This utility model belongs to the field of battery technology and discloses a battery casing assembly and a single battery cell. The battery casing assembly includes a casing structure, terminals, and a sealing element. The casing structure has a mounting wall with a terminal hole. The terminal includes a column and a bent portion. The column passes through the terminal hole, and the bent portion is located on the outer periphery of the column and is insulated on the side of the mounting wall away from the interior of the casing structure. The bent portion is inclined towards the mounting wall along the outer periphery of the column to the outer periphery of the bent portion. The sealing element is sleeved on the outer periphery of the column and can be compressed by the mounting wall and the outer periphery of the column. This battery casing assembly can offset internal stress, thereby ensuring the compression effect on the sealing element, ensuring the sealing performance of the terminal installation, and improving the reliability of the battery casing assembly.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a battery casing assembly and a single battery cell. Background Technology

[0002] In recent years, new energy battery projects have developed rapidly. Lithium-ion batteries are widely used in electric two-wheelers, automobiles, power tools and energy storage fields due to their high performance and long life. These batteries also need to have higher energy density and reliability to meet people's needs. The terminal assembly part in the battery casing is a key component to ensure these factors.

[0003] Currently, in cylindrical batteries, during the welding of the terminal posts after assembly of the battery casing components, the high-temperature environment generated during welding causes the sealing ring of the terminal post to rebound due to heat. This causes the internal stress generated after the terminal post is bent during assembly to produce the same rebound force, which leads to changes in the assembly dimensions of the terminal post. This causes the outer periphery of the bent part of the terminal post to warp, failing to meet the height tolerance range required by the design. Consequently, the clamping force of the terminal post on the sealing ring is reduced, resulting in a decrease in the compression of the sealing ring and posing a safety hazard of airtightness leakage.

[0004] Therefore, there is an urgent need for a battery casing assembly and a single battery cell to solve the above-mentioned technical problems. Utility Model Content

[0005] One objective of this invention is to provide a battery casing assembly that can counteract internal stress, thereby ensuring the pressing effect on the seal, ensuring the sealing performance of the terminal post installation, and improving the reliability of the battery casing assembly.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] Battery housing assembly, including housing structure, terminals, and seals,

[0008] The aforementioned outer casing structure has a mounting wall, on which pole holes are provided;

[0009] The aforementioned pole post includes a column body and a bent portion. The column body passes through the aforementioned pole post hole, and the aforementioned bent portion is disposed on the outer periphery of the aforementioned column body and is insulated on the side of the aforementioned mounting wall away from the interior of the aforementioned outer shell structure. Along the outer periphery of the aforementioned column body to the outer periphery of the aforementioned bent portion, the aforementioned bent portion is inclined toward the mounting wall.

[0010] The aforementioned sealing element is fitted onto the outer periphery of the aforementioned column and can be compressed by the aforementioned mounting wall and the outer periphery wall of the aforementioned column.

[0011] Optionally, the inclination angle of the aforementioned bend is α, where 4°≤α≤5°.

[0012] Optionally, the wall thickness of the bending portion gradually decreases from the outer periphery of the column to the outer periphery of the bending portion.

[0013] Optionally, the maximum wall thickness of the aforementioned bent portion is T1, where 0.8mm ≤ T1 ≤ 0.9mm.

[0014] Optionally, the aforementioned electrode post is formed by high-temperature baking.

[0015] Optionally, it also includes an external insulating member, a portion of which is disposed between the hole wall of the pole post hole and the outer peripheral wall of the post body, and the remaining portion is disposed between the bent portion and the mounting wall.

[0016] Optionally, it also includes an inner insulating member disposed on the side of the mounting wall facing the interior of the housing structure.

[0017] Optionally, the bent portion and the column are integrally formed, or the bent portion and the column are riveted together.

[0018] Optionally, the above-mentioned housing structure includes a housing and a cover plate, and the above-mentioned pole is connected to the housing or the cover plate.

[0019] Another objective of this invention is to provide a single battery cell, including the battery casing assembly described in any of the above embodiments.

[0020] The beneficial effects of this utility model are:

[0021] This invention provides a battery casing assembly and a single battery cell. The bent portion is inclined towards the mounting wall, so that the highest surface of the bent portion is lower than the highest surface of the column, which also increases the compression effect on the seal. When the terminal post is welded to other structures and generates a large amount of heat, the seal may deform upon contact with the column, generating a rebound force towards the bent portion. When this rebound force causes the bent portion to tilt away from the mounting wall, the inclined arrangement of the bent portion itself has a certain offsetting effect, and the remaining rebound force will not cause the tilting height of the bent portion to exceed the highest surface of the column. This ensures that the height of the terminal post meets the design requirements and also ensures the compression of the seal, resulting in good sealing performance of the terminal post and improving the reliability of the battery casing assembly. Attached Figure Description

[0022] Figure 1 This is an isometric view of the battery casing assembly provided in a specific embodiment of this utility model;

[0023] Figure 2 yes Figure 1 A magnified view of a section at point A in the middle;

[0024] Figure 3This is an isometric view of the pole post before installation, provided in a specific embodiment of this utility model;

[0025] Figure 4 This is a cross-sectional view of the pole before installation, provided in a specific embodiment of this utility model.

[0026] In the picture:

[0027] 10. Outer shell structure; 11. Mounting wall; 111. Pole post hole;

[0028] 20. Pole post; 21. Column; 22. Bending part; 23. Internal connecting part;

[0029] 30. Sealing component; 40. External insulation component; 50. Internal insulation component. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0031] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0032] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] In the description of this embodiment, the terms "upper," "lower," "left," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0034] The following reference Figures 1 to 4 This invention introduces the battery casing assembly and the single battery cell provided by the present invention.

[0035] This embodiment provides a battery housing assembly for counteracting internal stress, thereby ensuring the pressing effect on the seal 30, ensuring the sealing performance of the terminal post 20, and improving the reliability of the battery housing assembly.

[0036] Please refer to Figure 1 and Figure 2 Specifically, the battery casing assembly includes a casing structure 10, a terminal post 20, and a sealing element 30. The casing structure 10 has a mounting wall 11, on which a terminal post hole 111 is formed. The terminal post 20 includes a column body 21 and a bent portion 22. The column body 21 passes through the terminal post hole 111, and the bent portion 22 is disposed on the outer periphery of the column body 21 and is insulated on the side of the mounting wall 11 away from the interior of the casing structure 10. The bent portion 22 is inclined towards the mounting wall 11 along the outer periphery of the column body 21 to the outer periphery of the bent portion 22. The sealing element 30 is sleeved on the outer periphery of the column body 21 and can be compressed by the mounting wall 11 and the outer periphery wall of the column body 21.

[0037] In this embodiment, the battery casing assembly has the bent portion 22 tilted towards the mounting wall 11, so that the highest surface of the bent portion 22 is lower than the highest surface of the column 21, which also increases the compression effect on the seal 30. When the terminal post 20 is welded to other structures and generates a large amount of heat, the seal 30 may deform upon contact with the column 21, generating a rebound force towards the bent portion 22. When this rebound force causes the bent portion 22 to tilt away from the mounting wall 11, the tilted arrangement of the bent portion 22 itself has a certain offsetting effect, and the remaining rebound force will not cause the tilting height of the bent portion 22 to exceed the highest surface of the column 21. This ensures that the height of the terminal post 20 meets the design requirements and also ensures the compressibility of the seal 30, resulting in good sealing of the terminal post 20 and improving the reliability of the battery casing assembly.

[0038] It should be noted that the highest surface of the bent part 22 and the highest surface of the column 21 are both external connection surfaces of the pole post 20.

[0039] Optionally, the bent portion 22 and the column 21 can be integrally formed, or the bent portion 22 and the column 21 can be riveted together. That is, the bent portion 22 and the column 21 can be integrally formed, or the bent portion 22 can be set as a separate part, such as a riveting block, and then the connection between the two can be achieved by riveting the bent portion 22 and the column 21. Both methods can achieve the connection between the bent portion 22 and the column 21, and no specific limitation is made here.

[0040] For example, in this embodiment, the bent portion 22 and the column 21 are integrally formed.

[0041] Optionally, the tilt angle of the bend 22 is α, where 4°≤α≤5°. This setting allows the height difference between the highest surface of the bend 22 after bending and the highest surface of the column 21 to offset the uplift height of the bend 22, thereby improving the reliability of the battery casing assembly.

[0042] Furthermore, along the outer periphery of the column 21 to the outer periphery of the bend 22, the wall thickness of the bend 22 gradually decreases, thereby further increasing the height difference between the highest surface of the bend 22 and the highest surface of the column 21, so as to offset the uplift height of the bend 22, so that its height meets the design requirements, ensuring the compressibility of the seal 30, making the terminal post 20 well sealed, and improving the reliability of the battery casing assembly.

[0043] Optionally, the maximum wall thickness of the bent portion 22 is T1, where 0.8mm≤T1≤0.9mm. This setting ensures that the height difference between the highest surface of the bent portion 22 and the highest surface of the column 21 can offset the height of the bent portion 22.

[0044] Optionally, the bent portion 22 is formed by press-fitting the pole post 20.

[0045] Please refer to Figure 3 and Figure 4 Before the pole post 20 is assembled, the bending part 22 is a ring structure and is set on the outer periphery of one end wall of the column 21. Then, the bending part 22 and the column 21 are bent by press riveting.

[0046] Specifically, during the pressing and riveting process of the pole post 20, the bent part 22 is squeezed, so that the bent part 22 is inclined and the wall thickness is reduced.

[0047] Optionally, before the pole post 20 is assembled, the wall thickness of the bent portion 22 is T2, where T2 = 1.2 mm. After the pole post 20 is formed by press riveting, the wall thickness of the bent portion 22 is T1, where 0.8 mm ≤ T1 ≤ 0.9 mm, thereby reducing the wall thickness of the bent portion 22.

[0048] To prevent the bent portion 22 from cracking during the riveting process, the pole piece 20 can optionally be formed by high-temperature baking. That is, after the pole piece 20 is manufactured, it undergoes a high-temperature baking heat treatment, which increases its toughness, preventing cracking during bending and riveting. The increased toughness also increases the deformation resistance of the bent portion 22, further reducing the warping height of the bent portion 22.

[0049] For example, taking an aluminum pole 20 made of AL1060 / AL3003 material as an example, it can be heat-treated by baking it in a high-temperature furnace at 300℃±50℃ for 30 minutes and then naturally cooling it to enhance its toughness.

[0050] Please refer to Figure 1 and Figure 2 Optionally, the terminal post 20 further includes an inner connection portion 23, which is disposed on the side of the terminal post 20 facing the interior of the housing structure 10, so as to realize the electrical connection between the terminal post 20 and the battery cell in the battery housing assembly.

[0051] Furthermore, the aforementioned outer casing structure 10 includes a casing and a cover plate, with the pole post 20 connected to either the casing or the cover plate. That is, the outer casing structure 10 can be a combination of a casing and a cover plate, wherein the pole post 20 can be mounted on the casing or on the cover plate, without specific limitations.

[0052] For example, in this embodiment, the terminal post 20 is mounted on the housing in the battery housing assembly.

[0053] In this embodiment, the battery housing assembly further includes an external insulating member 40. A portion of the external insulating member 40 is disposed between the hole wall of the terminal post hole 111 and the outer peripheral wall of the post 21, and the remaining portion is disposed between the bending portion 22 and the mounting wall 11, so as to achieve insulation between the side of the terminal post 20 extending out of the housing structure 10 and the housing structure 10, thereby improving the safety of the battery housing assembly.

[0054] Furthermore, the battery housing assembly also includes an inner insulator 50, which is disposed on the side of the mounting wall 11 facing the interior of the housing structure 10, to achieve insulation between the side of the terminal post 20 that penetrates into the housing structure 10 and the housing structure 10, thereby improving the safety of the battery housing assembly.

[0055] This embodiment also provides a single-cell battery, which includes the battery casing assembly described in any of the above-described solutions. By providing this battery casing assembly, the sealing performance and reliability of the single-cell battery are improved.

[0056] It should be noted that the specific type of battery cell can be a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid (or lead-acid) battery, a lithium-ion battery, a polymer lithium-ion battery, etc. The battery cell can also be a primary lithium-ion battery, a lithium-sulfur battery, a sodium-lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc., which will not be elaborated further here.

[0057] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. A battery casing assembly, characterized in that, Includes a housing structure (10), a pole post (20), and a seal (30). The outer shell structure (10) has a mounting wall (11), and the mounting wall (11) has a pole hole (111); The pole post (20) includes a column (21) and a bent portion (22). The column (21) passes through the pole post hole (111). The bent portion (22) is disposed on the outer periphery of the column (21) and is insulated on the side of the mounting wall (11) away from the inside of the outer shell structure (10). The bent portion (22) is inclined towards the mounting wall (11) along the outer periphery of the column (21) to the outer periphery of the bent portion (22). The sealing element (30) is fitted around the outer periphery of the column (21) and can be compressed by the mounting wall (11) and the outer periphery wall of the column (21).

2. The battery casing assembly according to claim 1, characterized in that, The inclination angle of the bent portion (22) is α, where 4°≤α≤5°.

3. The battery casing assembly according to claim 1, characterized in that, Along the outer periphery of the column (21) to the outer periphery of the bent portion (22), the wall thickness of the bent portion (22) gradually decreases.

4. The battery casing assembly according to claim 3, characterized in that, The maximum wall thickness of the bent portion (22) is T1, 0.8mm≤T1≤0.9mm.

5. The battery casing assembly according to claim 1, characterized in that, The pole (20) is formed by baking at high temperature.

6. The battery casing assembly according to claim 1, characterized in that, It also includes an outer insulating member (40), a portion of which is disposed between the hole wall of the pole hole (111) and the outer peripheral wall of the column (21), and the remaining portion is disposed between the bent portion (22) and the mounting wall (11).

7. The battery casing assembly according to claim 1, characterized in that, It also includes an inner insulating member (50) disposed on the side of the mounting wall (11) facing the interior of the outer casing structure (10).

8. The battery casing assembly according to any one of claims 1-7, characterized in that, The bent portion (22) and the column (21) are integrally formed, or the bent portion (22) and the column (21) are riveted together.

9. The battery casing assembly according to any one of claims 1-7, characterized in that, The outer casing structure (10) includes a housing and a cover plate, and the pole post (20) is connected to the housing or the cover plate.

10. A single-cell battery, characterized in that, Includes the battery housing assembly as described in any one of claims 1-9.

Images