Cylindrical battery shell and cylindrical battery

Abstract

The utility model belongs to battery technical field discloses a cylindrical battery shell and cylindrical battery. The cylindrical battery shell includes shell body and pole module, is equipped with the accommodation space in the shell body, and the end face of shell body is opened and has the mounting through -hole, the pole module includes the conductive pole that inserts in the mounting through -hole, the conductive pole is insulatedly connected with the shell body, and includes first limit board body, second limit board body and coaxial first cylinder part and second cylinder part, and the diameter of second cylinder part is smaller, the surface of first cylinder part that is equipped with second cylinder part has the first limit board body that is formed by bending, and the bending groove is equipped between first limit board body and second cylinder part, and second limit board body is arranged in the side of first cylinder part away from second cylinder part. Through both sides limit board body two -way abutment and first cylinder part and mounting through -hole adaptation, form the stable limit structure, and through the first limit board body that is formed by bending increases the connection and the area of overflow, improves the overflow capacity.

Description

Technical Field

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

[0002] As the global energy structure shifts towards clean energy, the demand for power batteries in fields such as new energy vehicles and energy storage devices continues to rise. Cylindrical batteries, with their compact structure, high energy density, and excellent cycle performance, occupy an important position in various application scenarios. As a core component of the battery, the casing not only needs to provide stable housing space for the internal electrode assembly, but its connection structure with the conductive electrode posts directly affects the battery's conductivity, structural stability, and safety. Therefore, optimizing the connection method between the battery casing and the electrode posts has become one of the key directions for improving the overall performance of the battery.

[0003] In traditional cylindrical batteries, the connection between the terminals and the casing is usually achieved by riveting or welding. Riveting involves mechanically pressing the terminals and casing together at the contact point, using metal deformation to form a connection. Welding involves welding an additional connecting plate onto the surface of the terminal, and then fixing the connecting plate to the end face of the casing, thereby achieving an insulated connection and current conduction between the terminals and the casing.

[0004] However, the limited flange range of traditional riveting structures results in a small connection area between the terminal and the casing, insufficient current-carrying area, and a tendency to cause local current concentration, affecting the battery's current-carrying capacity. On the other hand, welding requires additional welding processes, which not only increases the production process and manufacturing costs, but also makes the structural strength of the welded joint highly susceptible to the welding process. During long-term use, factors such as vibration and thermal expansion and contraction may cause the connection to loosen, which may even affect the overall safety of the battery. Utility Model Content

[0005] The purpose of this utility model is to provide a cylindrical battery casing and a cylindrical battery, which has a large current-carrying area, strong current-carrying capacity, requires no welding, has low manufacturing cost, and high structural strength.

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

[0007] On one hand, a cylindrical battery casing is provided, the cylindrical battery casing comprising:

[0008] The outer casing has a housing space for accommodating the electrode assembly, and a mounting through hole communicating with the housing space is provided on the end face of the outer casing along the first direction.

[0009] An electrode module includes conductive electrode posts inserted into a mounting through hole and insulated from the outer casing. Each conductive electrode post includes a first column portion, a second column portion, a first limiting plate, and a second limiting plate. The first column portion is disposed within the mounting through hole. The second column portion is disposed on the side of the first column portion facing away from the accommodating space. The second column portion is coaxial with the first column portion and has a smaller diameter than the first column portion. A bent first limiting plate is provided on the surface of the first column portion where the second column portion is located. The first limiting plate abuts against the surface of the end face facing away from the accommodating space. A bending groove is provided between the first limiting plate and the second column portion. The second limiting plate is disposed on the side of the first column portion facing away from the second column portion and abuts against the surface of the end face facing the accommodating space.

[0010] Optionally, the conductive electrode post is further provided with a connection hole for insertion into the collector plate. The connection hole includes a first hole section and a second hole section. The second hole section is located on the side of the first hole section away from the accommodating space. The first hole section is a cone with a diameter that gradually decreases as it approaches the second hole section.

[0011] Optionally, the cone angle of the first conical hole segment is N, and satisfies 50°≤N≤70°.

[0012] Optionally, the pole module further includes an external insulating component, which includes a first external insulating portion and a second external insulating portion. The first external insulating portion is sandwiched between the first limiting plate and the end face and has a first insertion through hole for the first pole portion to pass through. The second external insulating portion is continuously disposed around the circumferential edge of the first insertion through hole and extends in a direction away from the first limiting plate. The second external insulating portion is inserted into the mounting through hole and covers the outer periphery of the first pole portion.

[0013] Optionally, the outer insulating member further includes a third outer insulating portion, which is continuously disposed around the outer peripheral edge of the first outer insulating portion and extends in a direction close to the first limiting plate body, and the third outer insulating portion covers the outer periphery of the first limiting plate body.

[0014] Optionally, the pole module further includes a sealing ring, which is sleeved on the outside of the first pole body and located between the end face and the second limiting plate, and the side of the second outer insulating part away from the first outer insulating part abuts against the sealing ring.

[0015] Optionally, the pole module further includes an inner insulating component, the inner insulating component including a first inner insulating portion, the first inner insulating portion being attached to the surface of the end face facing the accommodating space and located between the second limiting plate and the end face, the first inner insulating portion having a second insertion through hole for the first pole portion to pass through.

[0016] Optionally, the inner insulating member further includes a second inner insulating portion, which is disposed on the side of the first inner insulating portion away from the end face, and has a receiving groove for accommodating the second limiting plate.

[0017] Optionally, the width of the bending groove along the second direction is W, and satisfies 0.8mm≤W≤1.1mm.

[0018] On the other hand, a cylindrical battery is provided, the cylindrical battery comprising a cylindrical battery casing as described in any of the preceding claims.

[0019] The beneficial effects of this utility model are:

[0020] This invention provides a cylindrical battery casing. The conductive electrode posts of the cylindrical battery casing form a bidirectional abutment against the end face of the casing through a first limiting plate and a second limiting plate respectively set on both sides of the first column portion. Combined with the precise fit between the first column portion and the mounting through hole, a stable limiting structure is constructed, effectively avoiding the loosening or displacement problems that may occur in traditional connection methods. Specifically, the first limiting plate is formed by directly bending the surface of the first column portion. Compared with the traditional riveting and flanging process, its flanging range is significantly expanded. This not only significantly increases the connection area between the conductive electrode posts and the casing, but also directly improves the current-carrying area, making the current conduction path smoother, reducing local current concentration, thereby enhancing the overall current-carrying capacity of the battery and helping to reduce energy loss. At the same time, this one-piece bent-formed structure eliminates the need for additional welding connecting plates as in traditional solutions. This saves on cumbersome welding processes, simplifies the production process, reduces quality risks caused by welding process fluctuations, and reduces the number of components used, controlling manufacturing costs from the source. Furthermore, compared to welded composite structures, the integrated structure eliminates the weak points of welded joints, better resisting the stress effects of vibration, impact, and temperature changes. This significantly improves the structural strength and durability of the connection between the conductive electrode posts and the outer casing, providing a reliable guarantee for the long-term stable operation of the battery.

[0021] This utility model also provides a cylindrical battery. By using the above-mentioned cylindrical battery casing, the battery not only effectively reduces energy loss during charging and discharging through a larger current flow area, thus improving the charging and discharging efficiency and range of the battery, but also eliminates the welding process, which not only shortens the production cycle and reduces manufacturing costs, but also reduces the safety hazards that may be caused by welding defects. Attached Figure Description

[0022] Figure 1 This is a structural cross-sectional view of the cylindrical battery casing provided by this utility model;

[0023] Figure 2 This is an exploded view of the cylindrical battery casing provided by this utility model;

[0024] Figure 3 This is a schematic diagram of the structure of the conductive electrode post in the cylindrical battery casing provided by this utility model;

[0025] Figure 4 This is a cross-sectional view of the conductive electrode post in the cylindrical battery casing provided by this utility model;

[0026] Figure 5 This is a cross-sectional view of the structure of the outer insulating component in the cylindrical battery casing provided by this utility model;

[0027] Figure 6 This is a schematic diagram of the structure of the inner insulating component in the cylindrical battery casing provided by this utility model.

[0028] In the picture:

[0029] 1. Outer shell; 11. Accommodation space; 12. End face; 13. Mounting through hole;

[0030] 2. Electrode post module; 21. Conductive electrode post; 211. First post body; 212. Second post body; 213. First limiting plate; 214. Second limiting plate; 215. Bending groove; 216. Connecting hole; 2161. First hole segment; 2162. Second hole segment; 22. Outer insulating component; 221. First outer insulating part; 222. Second outer insulating part; 223. First insertion through hole; 224. Third outer insulating part; 23. Sealing ring; 24. Inner insulating component; 241. First inner insulating part; 242. Second insertion through hole; 243. Second inner insulating part; 244. Receiving groove. Detailed Implementation

[0031] 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.

[0032] 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 mechanical connection or an electrical connection; 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.

[0033] 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.

[0034] In the description of this embodiment, the terms "upper," "lower," "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.

[0035] Traditional riveting structures have limited flange range, resulting in a small connection area between the terminal and the casing, insufficient current-carrying area, and a tendency to cause local current concentration, affecting the battery's current-carrying capacity. Welding methods require additional welding steps, which not only increases the production process and manufacturing costs, but also the structural strength of the weld is greatly affected by the welding process. During long-term use, the connection may loosen due to factors such as vibration and thermal expansion and contraction, and may even affect the overall safety of the battery.

[0036] Therefore, in order to combine the advantages of traditional riveted and welded terminal posts, increase the current flow area, improve the current flow capacity, avoid the welding process, and reduce manufacturing costs, this embodiment provides a cylindrical battery casing.

[0037] like Figures 1 to 6As shown, the cylindrical battery casing includes a casing body 1 and an electrode module 2. The casing body 1 has a receiving space 11 for accommodating the electrode module. The casing body 1 has a mounting through hole 13 communicating with the receiving space 11 on its end face 12 along a first direction. The electrode module 2 includes conductive electrode posts 21, which are inserted into the mounting through hole 13 and are insulated from the casing body 1. The conductive electrode post 21 includes a first post portion 211, a second post portion 212, a first limiting plate 213, and a second limiting plate 214. The first post portion 211 is disposed in the mounting through hole 13, and the second post portion 212 is disposed in the first post portion 214. The body portion 211 is located on the side away from the accommodating space 11. The second column portion 212 is coaxial with the first column portion 211 and has a smaller diameter than the first column portion 211. The first column portion 211 has a first limiting plate 213 formed by bending on the surface of the second column portion 212. The first limiting plate 213 abuts against the surface of the end face 12 away from the accommodating space 11. A bending groove 215 is provided between the first limiting plate 213 and the second column portion 212. The second limiting plate 214 is located on the side of the first column portion 211 away from the second column portion 212 and abuts against the surface of the end face 12 facing the accommodating space 11.

[0038] The conductive electrode posts 21 of the cylindrical battery casing form a bidirectional abutment against the end face 12 of the casing through a first limiting plate 213 and a second limiting plate 214 respectively provided on both sides of the first column portion 211. Combined with the precise fit between the first column portion 211 and the mounting through hole 13, a stable limiting structure is constructed, effectively avoiding the loosening or displacement problems that may occur in traditional connection methods. Specifically, the first limiting plate 213 is formed by directly bending the surface of the first column portion 211. Compared to the traditional riveting and flanging process, its flanging range is significantly expanded. This not only significantly increases the connection area between the conductive electrode posts 21 and the casing, but also directly improves the current-carrying area, making the current conduction path smoother, reducing local current concentration, and thus enhancing the overall current-carrying capacity of the battery, helping to reduce energy loss. At the same time, this integrated bending and forming structure eliminates the need for additional welding connecting plates as in traditional solutions, saving cumbersome welding processes, simplifying the production process, reducing quality risks caused by welding process fluctuations, and reducing the number of components used, thus controlling manufacturing costs from the source. In addition, compared with the welded assembly structure, the integrated structure does not have the weak points of the welded joints, and can better resist the stress caused by vibration, impact and temperature changes. It significantly improves the structural strength and durability of the connection between the conductive electrode post 21 and the outer shell body 1, and provides a reliable guarantee for the long-term stable operation of the battery.

[0039] In this embodiment, the conductive electrode post 21 is integrally formed through a molding process, such as casting, to simultaneously form a first column portion 211, a second column portion 212, a first limiting plate 213, and a second limiting plate 214. After molding, the length direction of the first limiting plate 213 is the same as the axial direction of the conductive electrode post 21. After the conductive electrode post 21 is inserted into the mounting through hole 13, the first limiting plate 213 is bent using a flanging tool, so that the first limiting plate 213 abuts against the end face 12. A bending groove 215 is provided between the first limiting plate 213 and the second column portion 212 to facilitate the assembly of the bending tool.

[0040] Optionally, such as Figure 4 As shown, the conductive electrode post 21 is also provided with a connection hole 216 for insertion into the collector plate. The connection hole 216 includes a first hole section 2161 and a second hole section 2162. The second hole section 2162 is located on the side of the first hole section 2161 away from the accommodating space 11. The first hole section 2161 is a cone with a diameter that gradually decreases as it approaches the second hole section 2162.

[0041] By providing a connecting hole 216 consisting of a first hole segment 2161 and a second hole segment 2162, the current collector can be inserted into the conductive electrode post 21, increasing the contact area between the current collector and the conductive electrode post 21 and improving the current carrying capacity. Furthermore, the first hole segment 2161 is a tapered shape with a diameter that gradually decreases as it approaches the second hole segment 2162, thereby allowing the first hole segment 2161 to guide the insertion of the current collector, making the assembly of the conductive electrode post 21 and the current collector smoother.

[0042] Optionally, such as Figure 4 As shown, the cone angle of the first conical segment 2161 is N, and satisfies 50°≤N≤70°. By limiting the cone angle of the first segment 2161, good insertion guidance can be ensured, and a stable connection can be achieved through appropriate contact area and extrusion pressure, thus balancing flow capacity and structural strength.

[0043] The cone angle N of the first conical hole segment 2161 can be any value between 50° and 70° or a range between any two values, such as 50°, 55°, 60°, 65°, 70°, etc.

[0044] Optionally, such as Figure 5As shown, the pole module 2 also includes an outer insulating component 22, which includes a first outer insulating portion 221 and a second outer insulating portion 222. The first outer insulating portion 221 is sandwiched between the first limiting plate 213 and the end face 12, and has a first insertion through hole 223 for the first pole portion 211 to pass through. The second outer insulating portion 222 is continuously arranged around the circumferential edge of the first insertion through hole 223 and extends in a direction away from the first limiting plate 213. The second outer insulating portion 222 is inserted into the mounting through hole 13 and covers the outer periphery of the first pole portion 211. By designing the outer insulating component 22, which consists of the first outer insulating portion 221 and the second outer insulating portion 222, direct contact between the first limiting plate 213 and the end face 12 is avoided, ensuring good insulation.

[0045] Optionally, such as Figure 5 As shown, the outer insulating member 22 also includes a third outer insulating portion 224. The third outer insulating portion 224 is continuously disposed around the outer peripheral edge of the first outer insulating portion 221 and extends in a direction close to the first limiting plate 213. The third outer insulating portion 224 covers the outer periphery of the first limiting plate 213. By providing the third outer insulating portion 224 covering the outer periphery of the first limiting plate 213 on the outer insulating member 22, the protective area of ​​the outer insulating member 22 is expanded, and the insulation protection is improved. In this embodiment, the outer insulating member 22 is made of materials with high insulation properties such as polypropylene, polyethylene, and polytetrafluoroethylene.

[0046] Optionally, such as Figure 1 , Figure 2 As shown, the electrode module 2 also includes a sealing ring 23. The sealing ring 23 is sleeved on the outside of the first column portion 211 and located between the end face 12 and the second limiting plate 214. The side of the second outer insulating portion 222 facing away from the first outer insulating portion 221 abuts against the sealing ring 23. By providing the sealing ring 23 on the outside of the first column portion 211, leakage of electrolyte from the gap between the first column portion 211 and the end face 12 is prevented, and the second outer insulating portion 222 abuts against the sealing ring 23, thereby completing the connection with the sealing ring 23 and ensuring insulation protection. In this embodiment, the sealing ring 23 is made of materials such as nitrile rubber and fluororubber, which have chemical corrosion resistance, high and low temperature resistance, and good elasticity.

[0047] Optionally, such as Figure 6As shown, the pole module 2 also includes an inner insulating component 24. The inner insulating component 24 includes a first inner insulating portion 241. The first inner insulating portion 241 is attached to the surface of the end face 12 facing the accommodating space 11 and is located between the second limiting plate 214 and the end face 12. The first inner insulating portion 241 has a second insertion through hole 242 for the first pole portion 211 to pass through. By providing the first inner insulating portion 241 between the second limiting plate 214 and the end face 12, direct contact between the second limiting plate 214 and the end face 12 is avoided, ensuring insulation.

[0048] Optionally, such as Figure 6 As shown, the inner insulating member 24 also includes a second inner insulating portion 243. The second inner insulating portion 243 is disposed on the side of the first inner insulating portion 241 opposite to the end face 12, and has a receiving groove 244 for accommodating the second limiting plate 214. By providing the second inner insulating portion 243 and the receiving groove 244 on the second inner insulating portion 243, the contact area between the inner insulating member 24 and the second limiting plate 214 is increased, the protective area is expanded, and it has higher insulation protection.

[0049] Optionally, such as Figure 4 As shown, the width of the bending groove 215 along the second direction is W, and it satisfies 0.8mm≤W≤1.1mm. By limiting the width W of the bending groove 215 along the second direction, the reliability of the bending process and the structural strength can be guaranteed, while also taking into account the assembly tolerance and space utilization, thus ensuring the stable connection between the conductive electrode post 21 and the outer shell and the overall performance of the battery.

[0050] The width W of the bending groove 215 along the second direction can be any value between 0.8mm and 1.1mm or a range between any two values, such as 0.8mm, 0.9mm, 1.0mm, 1.1mm, etc.

[0051] In this embodiment, a cylindrical battery is also provided, which includes the aforementioned cylindrical battery casing. By using the cylindrical battery casing, this battery not only effectively reduces energy loss during charging and discharging due to its larger current-carrying area, thus improving the battery's charging and discharging efficiency and range, but also eliminates the welding process, shortening the production cycle, reducing manufacturing costs, and minimizing potential safety hazards caused by welding defects.

[0052] 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 cylindrical battery casing, characterized in that, The cylindrical battery casing includes: The outer shell body (1) has a accommodating space (11) for accommodating the electrode assembly inside. The outer shell body (1) has a mounting through hole (13) communicating with the accommodating space (11) on its end face (12) along the first direction. The electrode module (2) includes a conductive electrode post (21), which is inserted into the mounting through hole (13) and is insulated from the outer shell body (1). The conductive electrode post (21) includes a first post part (211), a second post part (212), a first limiting plate (213), and a second limiting plate (214). The first post part (211) is disposed in the mounting through hole (13), and the second post part (212) is disposed on the side of the first post part (211) away from the accommodating space (11). The second post part (212) is coaxial with the first post part (211). The diameter is smaller than that of the first column part (211). The first column part (211) has a first limiting plate (213) formed by bending on the surface of the second column part (212). The first limiting plate (213) abuts against the surface of the end face (12) away from the accommodating space (11). A bending groove (215) is provided between the first limiting plate (213) and the second column part (212). The second limiting plate (214) is provided on the side of the first column part (211) away from the second column part (212) and abuts against the surface of the end face (12) facing the accommodating space (11).

2. The cylindrical battery casing according to claim 1, characterized in that, The conductive electrode post (21) is also provided with a connection hole (216) for insertion into the collector plate. The connection hole (216) includes a first hole section (2161) and a second hole section (2162). The second hole section (2162) is located on the side of the first hole section (2161) away from the accommodating space (11). The first hole section (2161) is a cone with a diameter that gradually decreases as it approaches the second hole section (2162).

3. The cylindrical battery casing according to claim 2, characterized in that, The cone angle of the first conical hole segment (2161) is N, and satisfies 50°≤N≤70°.

4. The cylindrical battery casing according to claim 1, characterized in that, The pole module (2) further includes an outer insulating component (22), which includes a first outer insulating part (221) and a second outer insulating part (222). The first outer insulating part (221) is sandwiched between the first limiting plate (213) and the end face (12) and has a first insertion through hole (223) for the first column part (211) to pass through. The second outer insulating part (222) is continuously arranged around the circumferential edge of the first insertion through hole (223) and extends in a direction away from the first limiting plate (213). The second outer insulating part (222) is inserted into the mounting through hole (13) and covers the outer periphery of the first column part (211).

5. The cylindrical battery casing according to claim 4, characterized in that, The outer insulating member (22) further includes a third outer insulating part (224), which is continuously disposed around the outer peripheral edge of the first outer insulating part (221) and extends in a direction close to the first limiting plate (213). The third outer insulating part (224) covers the outer periphery of the first limiting plate (213).

6. The cylindrical battery casing according to claim 4, characterized in that, The pole module (2) also includes a sealing ring (23), which is sleeved on the outside of the first column part (211) and located between the end face (12) and the second limiting plate (214). The side of the second outer insulation part (222) away from the first outer insulation part (221) abuts against the sealing ring (23).

7. The cylindrical battery casing according to claim 1, characterized in that, The pole module (2) further includes an inner insulating member (24), which includes a first inner insulating part (241). The first inner insulating part (241) is attached to the surface of the end face (12) facing the accommodating space (11) and is located between the second limiting plate (214) and the end face (12). The first inner insulating part (241) has a second insertion through hole (242) for the first pole part (211) to pass through.

8. The cylindrical battery casing according to claim 7, characterized in that, The inner insulating member (24) further includes a second inner insulating part (243), which is disposed on the side of the first inner insulating part (241) away from the end face (12) and has a receiving groove (244) for accommodating the second limiting plate (214).

9. The cylindrical battery casing according to claim 1, characterized in that, The width dimension of the bending groove (215) along the second direction is W, and satisfies 0.8mm≤W≤1.1mm.

10. A cylindrical battery, characterized in that, The cylindrical battery includes a cylindrical battery casing as described in any one of claims 1-9.

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