Cylindrical battery cell and battery

Abstract

The utility model provides a cylindrical battery cell and a battery, the cylindrical battery cell comprises: a housing, the top of which is provided with a through hole; the pole column is mounted in the through hole and comprises an outer flange part and an inner flange part, and the outer flange part and the inner flange part are tightly pressed on the top to fix the pole column; the lower plastic is arranged between the pole and the shell; the face, facing the top, of the inner flange part is provided with a first protrusion, and at least part of the first protrusion is embedded into the lower plastic to form a mechanical buckle. According to the utility model, the convex structure is arranged at the inner flange part to form a mechanical buckle, so that the pole is effectively prevented from falling off during thermal runaway, high-temperature and high-pressure gas during thermal runaway is only sprayed out from the explosion-proof valve at the bottom of the battery cell, and the gas is prevented from being sprayed out from the top, thereby improving the safety and reliability of the battery.

Description

Technical Field

[0001] This utility model belongs to the field of battery technology, specifically relating to a cylindrical battery and a battery. Background Technology

[0002] With the widespread application of electronic devices and electric vehicles, the demand for high-performance and high-safety batteries is increasing. Cylindrical cells are widely used in various devices due to their excellent thermal management and mechanical stability. However, the existing terminal fixing structure of cylindrical cells poses certain safety hazards under extreme operating conditions. Currently, the terminals are usually fixed to the top of the casing by riveting. When a cylindrical cell experiences thermal runaway, the riveted portion of the terminal inside the casing is prone to failure under high temperature and high pressure, causing the terminal to lose its fixing function. At this time, the inside of the cell is under high temperature and high pressure, and the terminal can easily detach from the casing under the combined effect of internal and external factors, which may lead to serious safety accidents such as short circuits, fires, or even explosions, posing a serious threat to the safety and reliability of the battery system.

[0003] Therefore, how to effectively fix the electrode post during thermal runaway and prevent it from falling off is a technical problem that urgently needs to be solved. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a cylindrical battery and battery to improve the problem that the terminal post fails to detach from the casing due to failure of riveting under high temperature and high pressure ring conditions, thereby causing safety hazards.

[0005] To achieve the above and other related objectives, this utility model proposes a cylindrical battery cell, comprising:

[0006] A housing, wherein a through hole is provided at the top of the housing;

[0007] An electrode post, which is installed in the through hole, includes an outer flange and an inner flange, and the outer flange and the inner flange are pressed against the top to fix the electrode post;

[0008] The lower plastic component is installed between the electrode post and the housing.

[0009] The inner flange has a first protrusion on the side facing the top, and the first protrusion is at least partially embedded in the lower plastic to form a mechanical latch.

[0010] In one embodiment of the present invention, the surface of the lower plastic is provided with a first groove that matches the first protrusion.

[0011] In one embodiment of the present invention, a second groove is provided on the top surface of the housing, and the second groove matches the first protrusion.

[0012] In one embodiment of the present invention, the inner flange bends toward the top of the housing and forms an angle of less than 90° with the axis of the pole post.

[0013] In one embodiment of the present invention, a stress buffer structure is provided at the root of the first protrusion.

[0014] In one embodiment of the present invention, the first protrusion is arranged obliquely from the surface of the inner flange portion along a first direction.

[0015] In one embodiment of the present invention, a second protrusion is formed on the top inner surface of the housing, the second protrusion being located inside the first protrusion, and the first protrusion and the second protrusion at least partially overlap in the height direction.

[0016] In one embodiment of the present invention, a plurality of first protrusions are provided on the inner flange portion, and a plurality of second protrusions are provided on the inner surface of the top, wherein the plurality of first protrusions and the plurality of second protrusions are arranged alternately along a first direction.

[0017] In one embodiment of the present invention, a third groove is provided on the side of the lower plastic facing the top, and the third groove matches the second protrusion.

[0018] This utility model also proposes a battery comprising at least one cylindrical cell as described in any of the above embodiments.

[0019] This utility model proposes a cylindrical battery cell and battery. By setting a protruding structure on the inner flange to form a mechanical latch, it effectively prevents the terminal from detaching during thermal runaway. This ensures that the high-temperature, high-pressure gas during thermal runaway only exits from the explosion-proof valve at the bottom of the cell, preventing gas from exiting from the top, thereby improving the safety and reliability of the battery. This structure is simple and reliable, significantly improving the safety of the cylindrical battery cell and avoiding safety hazards caused by terminal detachment. Furthermore, this application also relates to specific structural designs such as a first groove on the lower plastic surface, a second groove on the top of the casing, the warping angle of the inner flange, a stress buffer structure, the inclined arrangement of the first protrusion, a second protrusion on the inner surface of the top of the casing, and a third groove on the lower plastic. These designs work together to improve the connection strength and reliability between the terminal and the casing, effectively reducing the risk of terminal detachment during thermal runaway and enhancing the safety and stability of the battery. This cylindrical battery cell can be applied to various battery systems to improve the overall performance and safety of the battery. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a partial schematic diagram of a cylindrical battery cell in one embodiment of the present invention.

[0022] Figure 2 This is a partial schematic diagram of the lower plastic layer in a cylindrical battery cell in one embodiment of the present invention.

[0023] Figure 3 This is a partial schematic diagram of a cylindrical battery cell in another embodiment of the present invention.

[0024] Figure 4 This is a partial schematic diagram of a cylindrical battery cell in yet another embodiment of the present invention.

[0025] Marker explanation:

[0026] 100. Cylindrical cell; 10. Housing; 11. Top; 20. Terminal post; 21. Outer flange; 22. Inner flange; 23. First protrusion; 30. Lower plastic; 31. First groove; 111. Second protrusion. Detailed Implementation

[0027] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0028] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0029] Currently, the terminals of cylindrical battery cells are riveted to the top of the casing, maintaining relative stability under normal operating conditions. However, when a cylindrical battery cell experiences thermal runaway, ideally, the high-temperature, high-pressure gas generated by the runaway should be able to escape smoothly from the explosion-proof valve at the bottom of the casing. The problem is that under extreme high-temperature, high-pressure conditions, the stability of the riveted portion of the terminals within the casing is significantly reduced, making it prone to failure. Once this happens, the terminals lose their fixed support, and since the inside of the cell is in a dangerous state of high temperature and pressure, the terminals can easily detach from the casing under the combined influence of internal and external factors. The high-temperature, high-pressure gas escaping from the top of the casing could trigger even more serious safety hazards, such as short circuits, fires, or even explosions, posing a serious threat to the safety and reliability of the battery system. Therefore, this invention proposes a cylindrical battery cell and a battery containing the cylindrical battery cell.

[0030] like Figure 1 As shown, this utility model provides a cylindrical battery cell 100, which includes a housing 10, a terminal 20, and a lower plastic core 30. A through hole is provided at the top 11 of the housing 10, and the terminal 20 is installed within this through hole. The terminal 20 includes an outer flange 21 and an inner flange 22, which are pressed against the top 11 of the housing 10, thereby fixing the terminal 20 to the housing 10. The lower plastic core 30 is installed between the terminal 20 and the housing 10, serving as insulation and support.

[0031] like Figure 1 As shown, in this embodiment, the inner flange 22 has a first protrusion 23 on the side facing the top 11 of the housing 10. The first protrusion 23 is at least partially embedded in the lower plastic 30, forming a mechanical snap-fit ​​structure. This design enhances the fixing force between the terminal post 20 and the housing 10 through mechanical snap-fit, and can effectively prevent the terminal post 20 from falling off, especially under high temperature and high pressure conditions, thus improving the safety of the battery.

[0032] like Figure 1 and Figure 2 As shown, in this embodiment, the surface of the lower plastic 30 is provided with a first groove 31 that matches the first protrusion 23. When the electrode post 20 is installed in place, the first protrusion 23 is embedded in the first groove 31, making the fit between the electrode post 20 and the lower plastic 30 tighter and improving the stability and reliability of the snap-fit. The first groove 31 allows the first protrusion 23 to be embedded more precisely in the lower plastic 30, reducing positional deviations during assembly, improving assembly efficiency and quality. At the same time, the fit between the first groove 31 and the first protrusion 23 increases the contact area, making the connection between the electrode post 20 and the lower plastic 30 more secure and effectively preventing the electrode post 20 from loosening and falling off during use.

[0033] like Figure 3As shown, in this embodiment, a second groove is provided on the inner surface of the top 11 of the housing 10, which matches the first protrusion 23. When the pole post 20 is installed on the housing 10, the first protrusion 23 cooperates with the second groove, further enhancing the fixing effect between the pole post 20 and the housing 10, thus restricting the displacement of the pole post 20 in all directions. The second groove allows a portion of the lower plastic 30 to be squeezed into the second groove when the first protrusion 23 is embedded in the lower plastic 30, making the connection between the pole post 20 and the lower plastic 30 more secure, effectively preventing the pole post 20 from loosening and falling off during use. At the same time, it can limit the movement of the lower plastic 30, further improving the fixing reliability of the pole post 20 and preventing the pole post 20 from falling off. Furthermore, a first groove 31 can be provided on the lower plastic 20, while a second groove can be provided on the housing 10. This dual design ensures that when the electrode post 20 is installed, the first protrusion 23 fits tightly with the first groove 31 and the second groove, forming a stable mechanical connection. At the same time, when the lower plastic 30 is squeezed into the second groove, it further enhances the connection strength between the electrode post 20 and the housing 10, improving installation reliability.

[0034] like Figure 3 As shown, in this embodiment, the inner flange 22 is bends towards the top 11 of the housing 10, forming an angle of less than 90° with the axis of the pole post 20. This design results in a bendable contact between the inner flange 22 and the lower plastic 30 when the pole post 20 is pressed against the top 11 of the housing 10. This bendable contact causes the inner flange 22 to exert a greater compressive force on the lower plastic 30 under the same compressive force. This is because the component of the compressive force in the bend direction increases, thereby enhancing the compressive force effect.

[0035] During installation, when the terminal post 20 is pressed into the through hole of the housing 10, the folded inner flange 22 first contacts the surface of the lower plastic 30. As the clamping force gradually increases, the folded inner flange 22 pushes the lower plastic 30 towards the top 11 of the housing 10, causing the lower plastic 30 to undergo a certain elastic deformation. This elastic deformation not only allows the first protrusion 23 to be embedded more deeply into the lower plastic 30, but also increases the friction and contact area between the two, thereby significantly improving the locking force between the first protrusion 23 and the lower plastic 30. When the battery is operating normally, this ensures a tight and reliable connection between the terminal post 20 and the housing 10, effectively preventing the terminal post 20 from loosening due to vibration or other external forces. In extreme situations such as thermal runaway, the high temperature and high pressure environment inside the housing 10 can cause a decrease in material strength, but the additional compressive force and locking force brought by the folded design can compensate for this decrease, thereby effectively reducing the risk of the terminal post 20 falling off and improving the safety and stability of the battery.

[0036] In this embodiment, a stress-buffering structure, such as a rounded corner or a groove, is provided at the root of the first protrusion 23. These structures can effectively disperse stress concentration, improve the fatigue resistance of the first protrusion 23, extend its service life, and ensure the fixed reliability of the pole post 20 during long-term use.

[0037] It is understood that the first direction X described in this embodiment refers to the radial direction from the outside to the inside along the pole post 20.

[0038] like Figure 1 As shown, in this embodiment, the first protrusion 23 is arranged obliquely along the first direction from the surface of the inner flange 22. This oblique design causes the first protrusion 23 to form an inverted structure when embedded in the lower plastic 30, which can generate more fastening force and increase the contact area with the lower plastic 30, generating greater friction, further enhancing the fastening force, and improving the connection strength between the pole post 20 and the lower plastic 30.

[0039] like Figure 4 As shown, in this embodiment, a second protrusion 111 is formed on the inner surface of the top 11 of the housing 10. The second protrusion 111 is located inside the first protrusion 23, and the first protrusion 23 and the second protrusion 111 at least partially overlap in the height direction. A limiting structure is formed between the first protrusion 23 and the second protrusion 111, which makes the pole post 20 more firmly fixed on the housing 10, significantly improving the fixing strength of the pole post 20, so that it can remain stable under extreme environments such as high temperature and high pressure, and effectively reducing the risk of the pole post 23 falling off.

[0040] like Figure 4 As shown, in this embodiment, the inner flange 22 is provided with a plurality of first protrusions 23, and the inner surface of the top 11 of the housing 10 is provided with a plurality of second protrusions 111. The plurality of first protrusions 23 and the plurality of second protrusions 111 are arranged alternately along the first direction. The alternating arrangement of the plurality of first protrusions 23 and the plurality of second protrusions 111 forms a multi-clamping structure, which makes the pole post 20 more firmly fixed on the housing 10, effectively improves the fixing strength, and reduces the risk of the pole post 20 falling off.

[0041] like Figure 4 As shown, in this embodiment, a third groove is provided on the side of the lower plastic 30 facing the top 11 of the housing 10, and this third groove matches the second protrusion 111. When the pole post 20 is installed in place, the second protrusion 111 is embedded in the third groove, making the fit between the lower plastic 30 and the housing 10 tighter and enhancing the stability of the overall structure. The second protrusion 111 and the first protrusion 23 form a limit, and at the same time, the second protrusion 111 can limit the lower plastic 30, preventing the lower plastic 30 from moving, further improving the fixing reliability of the pole post 20 and preventing the pole post 20 from falling off.

[0042] It is understood that in this embodiment, the first protrusion 23 and the second protrusion 111 can be configured as an annular protrusion or a plurality of protrusions evenly distributed along the circumference, and their cross-sections can be designed as trapezoidal, wavy or other shapes.

[0043] This invention also provides a battery comprising at least one cylindrical cell 100 as described above. To avoid repetition, further details are omitted here by employing a cylindrical cell with the improved structure described above. This battery effectively reduces the risk of terminal detachment in extreme situations such as thermal runaway, thereby improving the safety and reliability of the entire battery system. This battery can be widely used in various electronic devices, electric vehicles, and other fields, providing users with a safer and more reliable energy solution.

[0044] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more cylindrical cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. A battery generally includes a casing for encapsulating one or more cylindrical cells. The casing can prevent liquids or other foreign matter from affecting the charging or discharging of the cells. For example, a battery may be a battery module formed by connecting multiple cylindrical cells in series or parallel, or a mixture of series and parallel connections; or it may be a battery pack assembled from multiple such battery modules; or it may be a battery pack and a battery module formed directly from the cylindrical cells.

[0045] This utility model proposes a cylindrical battery cell and battery. By setting a protruding structure on the inner flange to form a mechanical latch, it effectively prevents the terminal from detaching during thermal runaway. This ensures that the high-temperature, high-pressure gas during thermal runaway only exits from the explosion-proof valve at the bottom of the cell, preventing gas from exiting from the top, thereby improving the safety and reliability of the battery. This structure is simple and reliable, significantly improving the safety of the cylindrical battery cell and avoiding safety hazards caused by terminal detachment. Furthermore, this application also relates to specific structural designs such as a first groove on the lower plastic surface, a second groove on the top of the casing, the warping angle of the inner flange, a stress buffer structure, the inclined arrangement of the first protrusion, a second protrusion on the inner surface of the top of the casing, and a third groove on the lower plastic. These designs work together to improve the connection strength and reliability between the terminal and the casing, effectively reducing the risk of terminal detachment during thermal runaway and enhancing the safety and stability of the battery. This cylindrical battery cell can be applied to various battery systems to improve the overall performance and safety of the battery.

[0046] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

[0047] Apart from the technical features described in the specification, the other technical features are known to those skilled in the art. To highlight the innovative features of this utility model, the other technical features will not be described in detail here.

Claims

1. A cylindrical battery cell (100), characterized in that, include: A housing (10), wherein a through hole is provided at the top (11) of the housing (10); The pole post (20) is installed in the through hole and includes an outer flange (21) and an inner flange (22). The outer flange (21) and the inner flange (22) are pressed against the top (11) to fix the pole post (20). Lower plastic (30), the lower plastic (30) is installed between the pole post (20) and the housing (10); The inner flange (22) has a first protrusion (23) on the side facing the top (11), and the first protrusion (23) is at least partially embedded in the lower plastic (30) to form a mechanical buckle.

2. The cylindrical battery cell (100) according to claim 1, characterized in that, The surface of the lower plastic (30) is provided with a first groove (31) that matches the first protrusion (23).

3. The cylindrical battery cell (100) according to claim 1, characterized in that, The top (11) surface of the housing (10) is provided with a second groove, which matches the first protrusion (23).

4. The cylindrical battery cell (100) according to claim 1, characterized in that, The inner flange (22) bends toward the top (11) of the housing (10) and forms an angle of less than 90° with the axis of the pole post (20).

5. The cylindrical battery cell (100) according to claim 1, characterized in that, The root of the first protrusion (23) is provided with a stress buffer structure.

6. The cylindrical battery cell (100) according to claim 1, characterized in that, The first protrusion (23) is arranged obliquely from the surface of the inner flange (22) along a first direction.

7. The cylindrical battery cell (100) according to claim 1, characterized in that, A second protrusion (111) is formed on the inner surface of the top (11) of the housing (10). The second protrusion (111) is located inside the first protrusion (23). The first protrusion (23) and the second protrusion (111) overlap at least partially in the height direction.

8. The cylindrical battery cell (100) according to claim 7, characterized in that, The inner flange (22) is provided with a plurality of first protrusions (23), and the inner surface of the top (11) is provided with a plurality of second protrusions (111). The plurality of first protrusions (23) and the plurality of second protrusions (111) are arranged alternately along the first direction.

9. The cylindrical battery cell (100) according to claim 7, characterized in that, The lower plastic (30) has a third groove on the side facing the top (11), and the third groove matches the second protrusion (111).

10. A battery, characterized in that, It includes at least one cylindrical cell (100) as described in any one of claims 1 to 9.

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