A lithium-ion cylindrical battery

Abstract

The utility model relates to a cylindrical battery technical field, put forward a kind of lithium ion cylindrical battery, including shell, pole, upper plastic, sealing ring and lower plastic;The upper plastic, the sealing ring and the lower plastic are all supported between the pole and the shell, and the upper plastic is clamped with the shell, and the lower plastic is respectively clamped with the shell and the pole;One end of the upper plastic is located in the mounting hole, the other end is sleeved in the outer side of the pole at the outer end of the shell, and the ring width of the upper plastic is L 20 , the wall thickness of the upper plastic at one end in the mounting hole is L 22 , L 22 / L 20 =7%-14%.The utility model can avoid the twist of pole in the use process of battery by clamping the upper plastic with the shell and clamping the lower plastic with the shell and pole, can reduce the short-circuit risk of battery by limiting the specification of the upper plastic inserted into one end of the mounting hole, to improve the overall performance of battery.

Description

Technical Field

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

[0002] A lithium-ion cylindrical battery is a type of battery encapsulated in a cylindrical casing. It stores and releases electrical energy by moving lithium ions between the positive and negative electrodes, and is widely used in consumer electronics, electric vehicles, and energy storage.

[0003] Terminals are an important component of lithium-ion cylindrical batteries, serving as key parts for the electrical connection between the battery and external circuitry. Terminals are typically fixed to the battery casing using riveting. By applying pressure, plastic deformation occurs between the terminal and the battery casing, creating a strong mechanical and electrical connection. During the riveting process, some material from the terminal is deformed and fills the corresponding riveting holes or areas on the battery casing, achieving a tight bond between the two.

[0004] For example, the cylindrical battery casing and battery pack disclosed in utility model CN223378280U configure the positive terminal as including a terminal body, an inner current collector, and an outer current collector, and sets an outer plastic sealing ring and a sealing ring between the terminal and the casing to achieve fixation and sealing between the terminal and the casing. However, the terminal, outer plastic sealing ring, and sealing ring of a cylindrical battery are usually circular. During battery use, especially for batteries used in conditions of frequent vibration or bumps, the terminal is prone to twisting, causing loosening at the terminal riveting joint, which gradually leads to problems with the airtightness of the terminal, until failure, affecting the safety performance and service life of the battery. Utility Model Content

[0005] In view of this, the present invention proposes a cylindrical lithium-ion battery that can not only prevent the terminals from twisting, but also reduce the risk of short circuits, while taking into account the energy density and manufacturing cost of the battery.

[0006] The technical solution of this utility model is implemented as follows: This utility model provides a lithium-ion cylindrical battery, including a casing, terminals, an upper plastic, a sealing ring, and a lower plastic. One end of the casing has a mounting hole; the terminals are located within the mounting hole and spaced apart from it; the upper plastic, the sealing ring, and the lower plastic are all abutted between the terminals and the casing, with the upper plastic engaging with the casing and the lower plastic engaging with both the casing and the terminals; one end of the upper plastic is located within the mounting hole, and the other end is fitted over the outer side of the terminal located outside the casing; the circumference width of the upper plastic is L. 20 The wall thickness of the upper plastic at one end inside the mounting hole is L. 22L 22 / L 20 =7%-14%.

[0007] Based on the above technical solution, preferably, the wall thickness of the upper plastic at the end furthest from the mounting hole is L. 21 L 21 / L 20 =8%-16%.

[0008] Based on the above technical solution, preferably, a first slot is provided at the end of the housing, and a first protrusion is integrally formed on the upper plastic, the first protrusion and the first slot engaging; the distance between the first slot and the mounting hole is L. 23 L 23 / L 20 =48%-60%.

[0009] Based on the above technical solutions, preferably, the distance between the first card slot and the periphery of the upper plastic is L. 24 L 24 / L 20 =4%-12%.

[0010] Based on the above technical solutions, preferably, the radius of the shell is R1, L 20 / R1=20%-30%.

[0011] Based on the above technical solutions, preferably, the pole post includes a connector, a first rivet plate, and a second rivet plate. The connector passes through the mounting hole and is spaced apart from it. The first rivet plate and the second rivet plate are integrally formed at both ends of the connector, and the first rivet plate is located outside the housing. One end of the upper plastic is fitted onto the outside of the connector and abuts against the inner wall of the mounting hole. The other end of the upper plastic is fitted onto the outside of the first rivet plate, and the middle position of the upper plastic is abutting between the first rivet plate and the housing. The height of the upper plastic fitted onto the outside of the connector is H. 20 The overall height of the pole is H. 10 H 20 / H 10 =23%-40%.

[0012] Based on the above technical solution, preferably, the height of the middle position of the upper plastic is H. 30 H 30 / H 10 =10%-21%.

[0013] Based on the above technical solutions, preferably, the height of the upper plastic sleeve at one end outside the first rivet plate is H. 40 H40 / H 10 =28%-45%.

[0014] Based on the above technical solutions, the preferred option is H. 10 =2.8mm-4.8mm.

[0015] Based on the above technical solutions, preferably, R1 = 21mm-25mm, L 20 =4.7mm-6.7mm.

[0016] The lithium-ion cylindrical battery of this invention has the following advantages over the prior art: (1) By making the upper plastic engage with the casing and the lower plastic engage with the casing and the terminal post, the terminal post can be prevented from twisting during battery use. By limiting the size of the upper plastic extending into the mounting hole, the risk of short circuit in the battery can be reduced, thereby improving the overall performance of the battery.

[0017] (2) By further limiting the specifications and installation position of the upper plastic and the pole, not only can the airtightness of the battery be further improved, but also the energy density of the battery can be guaranteed and the battery manufacturing cost can be reduced. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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.

[0019] Figure 1 This is a partial cross-sectional view of a lithium-ion cylindrical battery according to the present invention.

[0020] Figure 2 This is a cross-sectional view of the position between the electrode and the casing in a lithium-ion cylindrical battery according to this utility model.

[0021] Figure 3 This is a cross-sectional view of the upper plastic and sealing ring of a lithium-ion cylindrical battery according to this utility model.

[0022] Figure 4 This is a partial perspective view of the casing of a lithium-ion cylindrical battery according to the present invention.

[0023] Figure 5 This is a perspective view of the plastic material in a cylindrical lithium-ion battery according to this utility model.

[0024] Figure 6This is a three-dimensional view of the electrode in a lithium-ion cylindrical battery according to the present invention.

[0025] The components are: 1. Housing; 101. Mounting hole; 102. First slot; 2. Pole post; 21. Connector; 22. First rivet plate; 23. Second rivet plate; 3. Upper plastic; 301. First protrusion; 4. Sealing ring; 5. Lower plastic. Detailed Implementation

[0026] The technical solutions of this utility model will be clearly and completely described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0027] The present invention relates to a cylindrical lithium-ion battery, comprising a casing 1, terminals 2, an upper plastic 3, a sealing ring 4, and a lower plastic 5.

[0028] The housing 1 is used to protect the battery components. It has a hollow structure. The end of the housing 1 has a mounting hole 101. The middle position of the pole post 2 is set in the mounting hole 101 and spaced apart from the inner wall of the mounting hole 101. One end of the pole post 2 extends into the housing 1 and is connected to the tab of the winding core inside the housing 1. The other end of the pole post 2 extends out of the housing 1, so as to connect with the pole post 2 of the electrical device or other battery.

[0029] The housing 1 is typically made of a conductor, while the upper plastic 3, sealing ring 4, and lower plastic 5 are all made of insulating materials capable of elastic deformation, such as rubber or plastic. The upper plastic 3, sealing ring 4, and lower plastic 5 are all fixed between the terminal 2 and the housing 1 to prevent short circuits between the terminal 2 and the housing 1.

[0030] like Figure 1 and Figure 2 As shown, the pole post 2 includes a connector 21, a first rivet 22, and a second rivet 23. The connector 21 passes through the mounting hole 101, and the periphery of the connector 21 is spaced apart from the inner wall of the mounting hole 101. The first rivet 22 and the second rivet 23 are integrally formed at both ends of the connector 21, and the outer diameter of the first rivet 22 and the second rivet 23 is larger than the inner diameter of the mounting hole 101. The upper plastic 3 is held and fixed between the first rivet 22 and the housing 1, and the sealing ring 4 and the lower plastic 5 are held and fixed between the housing 1 and the second rivet 23, thereby realizing the fixed and insulating fit between the pole post 2 and the housing 1.

[0031] The first rivet 22 is located on the outside of the housing 1, and the second rivet 23 is located inside the housing 1. Both the first rivet 22 and the second rivet 23 are formed by riveting. During battery assembly, if... Figure 1 As shown, firstly, the second rivet plate 23 is riveted and formed at the lower end of the pole post 2. Then, the pole post 2 is passed through the mounting hole 101 from bottom to top. Then, the upper end of the pole post 2 is riveted to form the first rivet plate 22, thereby realizing the extrusion of the upper plastic 3, the sealing ring 4 and the lower plastic 5.

[0032] The upper plastic 3 has a ring structure, such as Figure 2 As shown, one end of the upper plastic 3 is fitted onto the outside of the connector 21 and extends into the mounting hole 101, abutting against the inner wall of the mounting hole 101. The other end of the upper plastic 3 is fitted onto the outside of the first rivet 22. The middle position of the upper plastic 3 is abutting between the first rivet 22 and the housing 1, so as to fully fill the gap between the outside of the housing 1 and the pole post 2, and effectively protect the end of the pole post 2 located outside the housing 1.

[0033] like Figure 2 and Figure 3 As shown, it is preferable to have the lower end of the upper plastic 3 abut against the sealing ring 4, thereby avoiding a short circuit between the housing 1 and the pole 2 at this position.

[0034] The housing 1, mounting hole 101, terminal post 2, upper plastic 3, sealing ring 4, and lower plastic 5 are preferably arranged coaxially to improve the stability and symmetry of the battery. Since the mounting hole 101, terminal post 2, upper plastic 3, sealing ring 4, and lower plastic 5 of a cylindrical battery are all circular or annular, the terminal post 2 is prone to twisting during battery use, especially in environments with frequent vibration or bumps. This can not only cause the connection structure of the terminal post 2 to break, but also loosen the first rivet 22 and the second rivet 23, affecting the airtightness and normal use of the battery.

[0035] Therefore, the upper plastic 3 is snapped into the housing 1, and the lower plastic 5 is snapped into the housing 1 and the pole 2 respectively, thereby improving the fixation of the pole 2, housing 1, upper plastic 3 and lower plastic 5 and preventing the pole 2 from twisting.

[0036] As a preferred embodiment, such as Figures 2-5 As shown, a first slot 102 is provided at the end of the housing 1, and a first protrusion 301 is integrally formed on the upper plastic 3. The first protrusion 301 and the first slot 102 are engaged. This engagement structure is used to achieve the engagement between the upper plastic 3 and the housing 1, thereby improving the firmness of their fixation.

[0037] Similarly, such as Figure 2As shown, a second protrusion is provided at the end of the housing 1, and a second slot is provided on the upper side of the lower plastic 5 to engage with the second protrusion. By engaging the second protrusion with the second slot, the lower plastic 5 is engaged with the housing 1, thereby improving the fixation of the lower plastic 5 and the housing 1. Correspondingly, a third slot is provided on the upper side of the second rivet 23, and a third protrusion is provided on the lower side of the lower plastic 5. By engaging the third protrusion with the third slot, the lower plastic 5 can be engaged with the pole post 2, thereby fixing the lower plastic 5 and the pole post 2.

[0038] like Figure 3 As shown, the second protrusion corresponds to the position of the first slot 102. The second protrusion and the first slot 102 can be quickly formed by stamping the housing 1.

[0039] The protrusions and slots in the above structure enable rapid nesting assembly, effectively improving battery assembly efficiency. The upper plastic 3, sealing ring 4, and lower plastic 5 are plastic parts, while the housing 1 and terminal post 2 are metal parts. The structural strength of the housing 1 and terminal post 2 is greater than that of the upper plastic 3, sealing ring 4, and lower plastic 5. This combination of metal parts + plastic parts + metal parts not only achieves torsional resistance for the terminal post 2 but also avoids occupying internal battery space, ensuring the battery's energy density.

[0040] Multiple first protrusions 301 and first slots 102 are provided, and the multiple first protrusions 301 and first slots 102 are arranged in a circumferential array along the axis of the housing 1. The number of first protrusions 301 is preferably 3-5, which can not only ensure the torsional resistance of the pole post 2, but also reduce the manufacturing difficulty and reduce the manufacturing cost.

[0041] like Figure 1 and Figure 2 As shown, the radius of the shell 1 is R1, and the ring width of the upper plastic 3 is L. 20 The wall thickness of the upper plastic 3 at the end furthest from the mounting hole 101 is L. 21 The wall thickness of the upper plastic 3 located at one end inside the mounting hole 101 is L. 22 The distance between the first slot 102 and the mounting hole 101 is L. 23 The distance between the first slot 102 and the periphery of the upper plastic 3 is L. 24 .

[0042] In some embodiments, R1 = 21mm-25mm, that is, the radius of the housing 1 is 21mm, 23mm or 25mm, etc.

[0043] In some embodiments, L 20 =4.7mm-6.7mm, meaning the ring width of the upper plastic 3 is 4.7mm, 5.7mm, or 6.7mm, etc.

[0044] In some embodiments, L 20 / R1=20%-30%, meaning the ring width of the upper plastic 3 is 20%, 25%, or 30% of the radius of the shell 1, etc. If L 20 If / R1 < 20%, then the ring width of the upper plastic 3 is too small, the outer diameter of the first rivet 22 will decrease accordingly, the riveting force of the first rivet 22 will weaken, and the long-term reliability of the first rivet 22 cannot be guaranteed; if L 20 If / R1>30%, the ring width of the upper plastic 3 is too large, and the outer diameter of the first rivet 22 will increase accordingly. The excessively large first rivet 22 will not only reduce its riveting force, but also increase the weight of the terminal post 2, resulting in an increase in the weight of the battery and a decrease in energy density.

[0045] In some embodiments, L 21 / L 20 =8%-16%, meaning the wall thickness of the end of the upper plastic 3 furthest from the mounting hole 101 is 8%, 12%, or 16% of the ring width of the upper plastic 3, etc. If L 21 / L 20 If the thickness is less than 8%, the wall thickness of the upper plastic 3 at the end furthest from the mounting hole 101 is too small, resulting in a decrease in its insulation withstand voltage. This could cause high voltage to break down the upper plastic 3 at that location, posing a short circuit risk. If L 21 / L 20 If the thickness is greater than 16%, the wall thickness of the upper plastic 3 at the end furthest from the mounting hole 101 will be too large, which will increase the weight and cost of the upper plastic 3, resulting in an increase in battery weight and a decrease in energy density.

[0046] In some embodiments, L 22 / L 20 =7%-14%, meaning the wall thickness of the upper plastic 3 at one end inside the mounting hole 101 is 7%, 10%, or 14% of the ring width of the upper plastic 3, etc. If L 22 / L 20 If the thickness is less than 7%, the wall thickness of the upper plastic 3 at one end inside the mounting hole 101 is too small, resulting in a decrease in its insulation withstand voltage. This could cause high voltage to break down the upper plastic 3 at that location, posing a short circuit risk. If L 22 / L 20 If the thickness is greater than 14%, the wall thickness of the upper plastic 3 at one end inside the mounting hole 101 will be too large, which will increase the weight and cost of the upper plastic 3, resulting in an increase in battery weight and a decrease in energy density.

[0047] In some embodiments, L 23 / L 20 =48%-60%, meaning the distance between the first slot 102 and the mounting hole 101 is 48%, 54%, or 60% of the width of the upper plastic ring 3, etc. If L 23 / L 20If the distance is less than 48%, then the gap between the first slot 102 and the mounting hole 101 is too small, making it difficult to achieve nesting of the housing 1 and related components; if L 23 / L 20 If the distance is greater than 60%, then the distance between the first slot 102 and the mounting hole 101 is too large, and it is also not easy to achieve the nesting of the shell 1 and related components.

[0048] In some embodiments, L 24 / L 20 =4%-12%, meaning the distance between the first slot 102 and the periphery of the upper plastic 3 is 4%, 8%, or 12% of the width of the upper plastic 3 ring, etc. If L 24 / L 20 If the distance is less than 4%, then the gap between the first slot 102 and the periphery of the upper plastic 3 is too small, making it difficult to achieve nesting of the shell 1 and related components; if L 24 / L 20 If the distance is greater than 12%, then the distance between the first slot 102 and the periphery of the upper plastic 3 is too large. The first slot 102 moves towards the center of the shell 1, and it is also not easy to nest with related components.

[0049] like Figure 3 As shown, the overall height of pole 2 is H. 10 The height of the three plastic sleeves on one side of the connector 21 is H. 20 The height of the middle position of the upper plastic 3 is H. 30 The height of the upper plastic 3 sleeves at one end of the outer side of the first rivet 22 is H. 40 .

[0050] In some embodiments, H 10 =2.8mm-4.8mm, meaning the overall height of pole 2 is 2.8mm, 3.8mm, or 4.8mm, etc.

[0051] In some embodiments, H 20 / H 10 =23%-40%, meaning the height of the upper plastic 3-piece set at one end of the connector 21 is 23%, 31%, or 40% of the overall height of the pole post 2, etc. If H 20 / H 10 If the height of the upper plastic sleeve 3 on the outer end of the connector 21 is less than 23%, a gap will appear between the upper plastic sleeve 3 and the sealing ring 4. If a certain voltage is generated between the shell 1 and the terminal 2, a short circuit will occur through this gap, affecting the normal operation of the battery; if H 20 / H 10 If the percentage is greater than 40%, the height of the upper plastic 3 sleeve on the outer end of the connector 21 is too large, and the upper plastic 3 will interfere with the sealing ring 4, leading to an increase in the battery assembly failure rate.

[0052] In some embodiments, H 30 / H10 =10%-21%, meaning the height of the middle position of the upper plastic 3 is 10%, 15%, or 21% of the overall height of the pole 2, etc. If H 30 / H 10 If the height is less than 10%, the height of the middle part of the upper plastic 3 is too small, its insulation and withstand voltage performance will decrease, making it easily broken down by high voltage, leading to a short circuit in the battery. At the same time, if the height of the middle part of the upper plastic 3 is too small, its structural strength will be weak. When the first rivet 22 squeezes the upper plastic 3, it will cause the upper plastic 3 to crack, failing to achieve a good insulation effect; if H 30 / H 10 If the height is greater than 21%, then the height of the middle part of the upper plastic 3 is too large, which will increase the weight of the battery and decrease the energy density of the battery.

[0053] In some embodiments, H 40 / H 10 =28%-45%, meaning the height of the upper plastic 3 sleeve at one end of the outer side of the first rivet 22 is 28%, 37%, or 45% of the overall height of the pole post 2, etc. If H 40 / H 10 If H < 28%, then the height of the upper plastic 3 sleeve on one end of the outer side of the first rivet 22 is too small, the insulation protection effect of the upper plastic 3 on the pole 2 is weakened, and the risk of short circuit will increase; if H 40 / H 10 If the height of the upper plastic 3 sleeve on the outer side of the first rivet 22 is too large, it will interfere with and squeeze the busbar above the pole post 2, affecting the welding between the busbar and the pole post 2, and causing problems such as poor welding between the busbar and the pole post 2.

[0054] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lithium-ion cylindrical battery, characterized in that: It includes a housing (1), a pole (2), an upper plastic part (3), a sealing ring (4), and a lower plastic part (5), wherein, One end of the housing (1) is provided with a mounting hole (101); The pole post (2) is located inside the mounting hole (101) and is spaced apart from it; The upper plastic (3), the sealing ring (4) and the lower plastic (5) are all disposed between the pole post (2) and the housing (1), and the upper plastic (3) is engaged with the housing (1), and the lower plastic (5) is engaged with the housing (1) and the pole post (2) respectively. One end of the upper plastic (3) is located inside the mounting hole (101), and the other end is fitted onto the outer side of the end of the pole post (2) located outside the housing (1). The circumference width of the upper plastic (3) is L. 20 The wall thickness of the upper plastic (3) at one end located inside the mounting hole (101) is L. 22 L 22 / L 20 =7%-14%.

2. A lithium-ion cylindrical battery as described in claim 1, characterized in that: The wall thickness of the upper plastic (3) at the end away from the mounting hole (101) is L. 21 L 21 / L 20 =8%-16%.

3. A lithium-ion cylindrical battery as described in claim 1, characterized in that: The end of the housing (1) is provided with a first slot (102), and the upper plastic (3) is integrally formed with a first protrusion (301), which is engaged with the first slot (102). The distance between the first card slot (102) and the mounting hole (101) is L. 23 L 23 / L 20 =48%-60%.

4. A lithium-ion cylindrical battery as described in claim 3, characterized in that: The distance between the first card slot (102) and the periphery of the upper plastic (3) is L. 24 L 24 / L 20 =4%-12%.

5. A lithium-ion cylindrical battery as described in any one of claims 1-4, characterized in that: The radius of the shell (1) is R1, L 20 / R1=20%-30%.

6. A lithium-ion cylindrical battery as described in claim 1, characterized in that: The pole post (2) includes a connector (21), a first rivet (22), and a second rivet (23). The connector (21) passes through the mounting hole (101) and is spaced apart from it. The first rivet (22) and the second rivet (23) are integrally formed at both ends of the connector (21), and the first rivet (22) is located outside the housing (1). One end of the upper plastic (3) is fitted on the outside of the connector (21) and abuts against the inner wall of the mounting hole (101). The other end of the upper plastic (3) is fitted on the outside of the first rivet plate (22). The middle position of the upper plastic (3) is abutted between the first rivet plate (22) and the housing (1). The upper plastic (3) is fitted onto one end of the connector (21) at a height of H. 20 The overall height of the pole (2) is H. 10 H 20 / H 10 =23%-40%.

7. A lithium-ion cylindrical battery as described in claim 6, characterized in that: The height of the middle position of the upper plastic (3) is H. 30 H 30 / H 10 =10%-21%.

8. A lithium-ion cylindrical battery as described in claim 7, characterized in that: The height of the upper plastic (3) fitted onto one end of the outer side of the first rivet (22) is H. 40 H 40 / H 10 =28%-45%.

9. A lithium-ion cylindrical battery as described in any one of claims 6-8, characterized in that: H 10 =2.8mm-4.8mm。 10. A lithium-ion cylindrical battery as described in claim 5, characterized in that: R1=21mm-25mm,L 20 =4.7mm-6.7mm.

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