Cylindrical battery

Abstract

The utility model relates to battery design technical field discloses a kind of cylindrical batteries, comprising: shell and battery cover plate;At least one end of shell has opening;Battery cover plate is connected with shell arrangement, and blocks opening, battery cover plate includes cover plate main body, boss and positioning part, boss is connected with cover plate main body, and it is set in the side of cover plate main body close to shell, positioning part is connected with the outer wall of boss, and at least part of the side of positioning part away from boss is abutted with the inner wall of shell.The utility model is when shell and battery cover plate are assembled and connected, realize quick orientation by positioning part, improve assembly production efficiency;At least part of positioning part is abutted with the inner wall of shell, generate friction between positioning part and shell inner wall, prevent battery cover plate and shell from being offset during assembly process, and then guarantee the welding strength of battery cover plate and shell, improve the security of cylindrical battery.

Description

Technical Field

[0001] This utility model relates to the field of battery design technology, specifically to cylindrical batteries. Background Technology

[0002] In the field of energy storage, the cylindrical structure makes it better able to resist external forces and less prone to deformation, ensuring the safety and reliability of the battery under complex working conditions. Cylindrical batteries have been widely used and continue to develop due to their unique advantages.

[0003] However, in existing technologies, the lack of precise positioning during the assembly of the cover plate and the housing easily leads to misalignment. This results in uneven welds, a reduced effective welding area, and consequently, lower weld strength. Batteries with insufficient weld strength are prone to breakage at the connection points when subjected to external forces such as vibration and compression during use, affecting normal battery operation and potentially causing safety accidents in severe cases. Utility Model Content

[0004] In view of this, the present invention provides a cylindrical battery to solve the problem that the cover plate and the shell are easily misaligned during assembly, resulting in low welding strength and low yield.

[0005] In a first aspect, the present invention provides a cylindrical battery, comprising: a housing and a battery cover; at least one end of the housing has an opening; the battery cover is connected to the housing and seals the opening, the battery cover comprising a cover body, a boss and a positioning part, the boss being connected to the cover body and disposed on the side of the cover body close to the housing, the positioning part being connected to the outer peripheral wall of the boss, and at least a portion of the positioning part on the side away from the boss abutting against the inner wall of the housing.

[0006] Beneficial effects: When assembling the casing and battery cover, the positioning part enables rapid guidance and positioning, improving assembly production efficiency; at least part of the positioning part abuts against the inner wall of the casing, and the friction generated between the positioning part and the inner wall of the casing prevents the battery cover from being misaligned during assembly, thereby ensuring the welding strength of the battery cover and the casing and improving the safety of the cylindrical battery. Attached Figure Description

[0007] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0008] Figure 1This is a schematic diagram of the overall structure of the cylindrical battery according to an embodiment of the present invention;

[0009] Figure 2 This is a schematic diagram of the shell structure according to an embodiment of the present utility model;

[0010] Figure 3 This is a schematic diagram of the structure of the battery cover plate according to an embodiment of the present utility model;

[0011] Figure 4 for Figure 3 A magnified view of part A in the diagram;

[0012] Figure 5 This is a schematic diagram of the structure of the positioning part located on the first side near the boss in an embodiment of this utility model;

[0013] Figure 6 This is a schematic diagram of the structure in an embodiment of the present invention, showing the positioning part disposed between the first and second surfaces of the boss;

[0014] Figure 7 This is a structural schematic diagram of an embodiment of the present invention when the thickness of the positioning part is equal to the thickness of the boss;

[0015] Figure 8 This is a top view of the connection between the positioning part and the boss in an embodiment of the present invention.

[0016] Explanation of reference numerals in the attached figures:

[0017] 10. Housing; 11. Bottom wall; 12. Side wall; 13. Opening; 20. Battery cover; 21. Cover body; 22. Boss; 221. First surface; 222. Second surface; 23. Positioning part; 231. Contact surface. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0019] The following is combined with Figures 1 to 8 The following describes embodiments of the present invention.

[0020] According to an embodiment of the present invention, a cylindrical battery is provided, comprising: a housing 10 and a battery cover 20; at least one end of the housing 10 has an opening 13; the battery cover 20 is connected to the housing 10 and seals the opening 13, the battery cover 20 includes a cover body 21, a boss 22 and a positioning part 23, the boss 22 is connected to the cover body 21 and is disposed on the side of the cover body 21 near the housing 10, the positioning part 23 is connected to the outer peripheral wall of the boss 22, and at least a portion of the side of the positioning part 23 away from the boss 22 abuts against the inner wall of the housing 10.

[0021] When the cylindrical battery of this embodiment is assembled and connected with the housing 10 and the battery cover 20, the positioning part 23 enables rapid guiding and positioning, thereby improving assembly production efficiency. At least a portion of the positioning part 23 abuts against the inner wall of the housing 10. The friction generated between the positioning part 23 and the inner wall of the housing 10 prevents the battery cover 20 from being misaligned during the assembly process with the housing 10, thereby ensuring the welding quality and welding strength of the battery cover 20 and the housing 10, and improving the reliability and safety of the cylindrical battery.

[0022] It should be noted that in the relevant technology, during the assembly of the battery cover 20 and the housing 10, after the battery cover 20 is embedded into the housing 10, due to a lack of precise positioning, the battery cover 20 is prone to misalignment. This will lead to uneven welds during welding, a reduced effective welding area, and consequently, a decrease in weld strength. Batteries with insufficient weld strength are prone to breakage at the connection points when subjected to external forces such as vibration or compression during use, affecting the normal operation of the battery and potentially causing safety accidents in severe cases.

[0023] Therefore, in this embodiment, a positioning part 23 is added to the battery cover 20. The positioning part 23 plays a guiding role when the battery cover 20 enters the housing 10. Before the battery cover 20 is welded to the housing 10, the friction generated by the positioning part 23 abutting against the inner wall of the housing 10 prevents the battery cover 20 from shaking and keeps the battery cover 20 in a centered position within the housing 10. This ensures that the battery cover 20 is in a precise welding position, thereby improving the welding yield and ensuring battery safety.

[0024] It should be noted that in this embodiment, the housing 10 is used to encapsulate components such as the battery cell and electrolyte. The shape of the housing 10 can be adjusted according to the specific shape and size of the battery cell. The battery cover 20 is placed over the opening of the housing 10 to isolate the housing space where the battery cell is located from the external environment. The shape of the battery cover 20 can be adapted to the shape of the housing 10 to fit the housing 10. The battery cover can be made of a material with a certain hardness and strength (such as aluminum alloy).

[0025] Specifically, the housing 10 includes a bottom wall 11 and a side wall 12. The side wall 12 is arranged to surround the housing in the circumferential direction. The bottom wall 11 is connected to the side wall 12. The bottom wall 11 is arranged opposite to the opening 13. At least a portion of the positioning part 23 on the side away from the boss 22 abuts against the side wall 12.

[0026] Furthermore, the side of the positioning part 23 away from the boss 22 abuts against the side wall 12 to increase the friction between the positioning part 23 and the inner wall of the housing 10, and to prevent the battery cover 20 from being misaligned during the assembly of the housing 10.

[0027] In the first embodiment of the positioning unit 23, such as Figure 3 As shown, a number of positioning parts 23 are arranged at intervals along the circumference of the boss 22.

[0028] For details, please refer to Figure 3 There are eight positioning parts 23, which are spaced apart around the circumference of the boss 22.

[0029] Furthermore, the eight positioning parts 23 are evenly spaced along the circumference of the boss 22, that is, the distance between two adjacent positioning parts 23 is equal along the circumference of the boss 22.

[0030] It should be noted that in other alternative embodiments, the number of positioning units 23 can be adjusted according to actual needs.

[0031] It is worth noting that in this embodiment, the above-mentioned "at least part of the side of the positioning part 23 away from the boss 22 abuts against the inner wall of the housing 10" means that during the assembly process of the battery cover 20 and the housing 10, some of the positioning parts 23 may abut against the inner wall of the housing 10 on the side away from the boss 22, or all of the positioning parts 23 may abut against the inner wall of the housing 10 on the side away from the boss 22.

[0032] In the second embodiment of the positioning part 23, the positioning part 23 is continuously arranged along the circumference of the boss 22. That is, the positioning part 23 is arranged around the entire circumference of the boss 22.

[0033] Specifically, the positioning part 23 is annular. The annular positioning part 23 increases the contact area between the positioning part 23 and the side wall 12, thereby making the contact between the positioning part 23 and the side wall 12 of the housing 10 more compact and stable, and enhancing the positioning accuracy.

[0034] For example, the positioning part 23 is annular, and the side of the positioning part 23 away from the boss 22 abuts against the side wall 12.

[0035] It is worth noting that in this embodiment, the above-mentioned "at least part of the side of the positioning part 23 away from the boss 22 abuts against the inner wall of the housing 10" means that during the assembly of the battery cover 20 and the housing 10, only part of the circumferential surface of the side of the positioning part 23 away from the boss 22 may abut against the inner wall of the housing 10. Of course, the entire circumferential surface of the side of the positioning part 23 away from the boss 22 may abut against the inner wall of the housing 10.

[0036] In the third embodiment of the positioning part 23, the positioning part 23 is provided in one part, and the positioning part 23 is provided on the outer periphery of the boss 22.

[0037] For example, the positioning part 23 is semi-circular, and the side of the positioning part 23 away from the boss 22 abuts against the side wall 12.

[0038] It is worth noting that in this embodiment, the above-mentioned "at least part of the side of the positioning part 23 away from the boss 22 abuts against the inner wall of the housing 10" means that during the assembly of the battery cover 20 and the housing 10, only part of the circumferential surface of the side of the positioning part 23 away from the boss 22 may abut against the inner wall of the housing 10. Of course, the entire circumferential surface of the side of the positioning part 23 away from the boss 22 may abut against the inner wall of the housing 10.

[0039] In one embodiment, a plurality of positioning parts 23 are symmetrically arranged on the outer peripheral wall of the boss 22, and the number of positioning parts 23 is 2n, satisfying 1≤n≤8.

[0040] Specifically, several positioning parts 23 are symmetrically arranged on the outer peripheral wall of the boss 22 along one radial direction.

[0041] It should be noted that the number of positioning parts 23 is an integer multiple of two, so that several positioning parts 23 can be symmetrically arranged on the outer peripheral wall.

[0042] It is worth noting that by controlling the number of positioning parts 23, the positioning and guiding function of the positioning parts 23 is guaranteed, while preventing the setting of too many positioning parts 23 from causing large deformation of the housing 10.

[0043] In the first embodiment, such as Figure 5 As shown, along the height direction of the cylindrical battery, the thickness of the positioning part 23 is T1, the thickness of the boss 22 is T2, T1 < T2, the side of the boss 22 away from the cover plate body 21 is the first surface 221, and the positioning part 23 is set close to the first surface 221.

[0044] Specifically, such as Figure 5 As shown, the lower end of the positioning part 23 is connected to the lower end of the boss 22. It can be understood that there is a gap between the upper end of the positioning part 23 and the cover plate body 21 at this time.

[0045] It is worth noting that when the positioning part 23 is positioned close to the first surface 221, and the battery cover 20 is connected to the housing 10 and the opening 13 is blocked, the positioning part 23 first enters the opening 13 and abuts against the inner wall of the housing 10, thereby realizing the rapid assembly and positioning of the battery cover 20.

[0046] In the second embodiment, as Figure 6 As shown, along the height direction of the cylindrical battery, the thickness of the positioning part 23 is T1, the thickness of the boss 22 is T2, T1 < T2, the side of the boss 22 away from the cover plate body 21 is the first surface 221, and the side of the boss 22 close to the cover plate body 21 is the second surface 222. Along the height direction of the cylindrical battery, the positioning part 23 is disposed between the first surface 221 and the second surface 222.

[0047] Specifically, such as Figure 6 As shown, there is a gap between the upper end of the positioning part 23 and the cover plate body 21, and there is also a step difference between the lower end of the positioning part 23 and the first surface 221 of the boss 22.

[0048] Furthermore, such as Figure 6 As shown, the positioning part 23 is located at the middle position of the outer peripheral wall of the boss 22. That is, along the height direction of the cylindrical battery, the distance between the upper end of the positioning part 23 and the second surface 222 is equal to the distance between the lower end of the positioning part 23 and the first surface 221.

[0049] It is worth noting that the positioning part 23 is located near the middle of the outer peripheral wall of the boss 22. When the battery cover 20 is connected and assembled with the housing 10, the lower structure of the battery cover 20 (i.e., the boss 22) first enters the housing 10, and then is guided and positioned by the positioning part 23, which improves the assembly speed.

[0050] In the third embodiment, as Figure 7 As shown, along the height direction of the cylindrical battery, the thickness of the positioning part 23 is T1, and the thickness of the boss 22 is T2, where T1=T2.

[0051] Specifically, such as Figure 7 As shown, the distance between the upper end of the positioning part 23 and the second surface 222 and the distance between the lower end of the positioning part 23 and the first surface 221 are both zero. It can be understood that the upper end of the positioning part 23 abuts against the cover plate body 21.

[0052] It is worth noting that, compared to the solution where the thickness of the positioning part 23 is less than the thickness of the boss 22, the thickness of the positioning part 23 is equal to the thickness of the boss 22. This increases the connection area between the positioning part 23 and the boss 22, thereby improving the connection stability between the positioning part 23 and the boss 22. The positioning part 23 can transmit the compressive force it bears to the boss 22 more evenly, avoiding stress concentration, improving the connection reliability between the positioning part 23 and the boss 22, and increasing the service life of the positioning part 23.

[0053] In one embodiment, such as Figure 4 As shown, a contact surface 231 is formed on the positioning part 23, and the contact surface 231 abuts against the housing 10. The contact surface 231 is an arc-shaped surface.

[0054] Specifically, the contact surface 231 abuts against the side wall 12.

[0055] It should be noted that the contact surface 231 is an arc-shaped surface. The arc shape guides the battery cover 20 into the housing 10, preventing assembly jamming or structural damage caused by slight deviations, and making the assembly process of the battery cover 20 and the housing 10 smoother. During the assembly process of the battery cover 20 and the housing 10, the battery cover 20 is easier to align and insert into the opening 13, improving production efficiency.

[0056] It should be further noted that after the battery cover 20 and the housing 10 are assembled, there are fewer cases of sharp corners and gaps on the curved surface, which effectively prevents excess substances such as gas, liquid or dust from entering the interior of the battery housing 10 and improves the sealing performance of the cylindrical battery.

[0057] Furthermore, along the height direction of the cylindrical battery, the lower end of the positioning part 23 is provided with an inclined surface to guide the positioning part 23 when it just enters the housing 10.

[0058] In one embodiment, such as Figure 8 As shown, along the tangent direction of the connection point between the positioning part 23 and the boss 22, the width of the positioning part 23 is W, which satisfies 0.1mm≤W≤0.5mm.

[0059] Specifically, when the positioning part 23 and the boss 22 are connected by a line along the height direction, the connection point between the positioning part 23 and the boss 22 is the projection point of the connecting line between the boss 22 and the positioning part 23 along the height direction, and the tangent direction of the connection point is the tangent direction of the boss 22 at that projection point. When the positioning part 23 and the boss 22 are connected by a connecting surface, the connection point between the positioning part 23 and the boss 22 is the midpoint of the projection line segment of the connecting surface between the boss 22 and the positioning part 23 along the height direction, and the tangent direction of the connection point is the tangent direction of the midpoint of that projection line segment.

[0060] It should be noted that, in order to facilitate the fitting of the boss 22 into the housing 10, a gap is left between the boss 22 and the housing 10. When W < 0.1 mm, the width of the positioning part 23 is too small, and the width of the positioning part 23 is smaller than the width of the gap between the boss 22 and the housing 10, so the positioning part 23 cannot play a positioning role. When W > 0.5 mm, the width of the positioning part 23 is too wide. During the assembly process of the battery cover 20 and the housing 10, the positioning part 23 is easy to squeeze and deform the housing 10, resulting in excessive deformation of the housing 10. The deformation of the housing 10 is easy to squeeze the battery cell, thereby affecting the safety performance of the cylindrical battery.

[0061] Optionally, the width W of the positioning part 23 can be any value among 0.1mm, 0.15mm, 0.25mm, 0.35mm, 0.4mm, and 0.5mm, or a value between any two of these values.

[0062] It is worth noting that by limiting the width W of the positioning part 23, the structural strength of the positioning part 23 is ensured while preventing excessive compression deformation of the housing 10 by the positioning part 23, thereby ensuring the safety of the cylindrical battery.

[0063] In one embodiment, such as Figure 5 As shown, along the height direction of the cylindrical battery, the thickness of the positioning part 23 is T1, which satisfies 0.3mm≤T1≤1.2mm.

[0064] It should be noted that when T1 < 0.3 mm, the thickness of the positioning part 23 is too small, resulting in low structural strength of the positioning part 23. During the assembly process of the battery cover 20 and the housing 10, the positioning part 23 is prone to significant wear. When T > 1.2 mm, the thickness of the positioning part 23 is too large. During the assembly process of the battery cover 20 and the housing 10, the positioning and guiding time of the positioning part 23 is longer, affecting the assembly rate of the battery cover 20 and the housing 10.

[0065] Optionally, the thickness T1 of the positioning part 23 can be any value among 0.3mm, 0.4mm, 0.6mm, 0.8mm, 1mm, and 1.2mm, or a value between any two of these values.

[0066] It is worth noting that by limiting the thickness T1 of the positioning part 23, the structural strength of the positioning part 23 is improved and the service life of the positioning part 23 is increased while ensuring the assembly rate of the battery cover 20 and the housing 10.

[0067] In one embodiment, such as Figure 1 As shown, the inner diameter of the housing 10 is D1, as... Figure 8 As shown, the diameter of the circumscribed circle of the positioning part 23 on the orthographic projection plane along the height direction of the cylindrical battery is D2, which satisfies 1≤D2 / D1≤1.05.

[0068] It should be noted that the positioning part 23 and the side wall 12 are interference fit.

[0069] Furthermore, when D2 / D1 < 1, the interference fit between the positioning part 23 and the side wall 12 fails, and the positioning part 23 cannot achieve the overall positioning function of the battery cover 20; when D2 / D1 > 1.05, the diameter D2 of the circumscribed circle of the positioning part 23 on the orthographic projection plane along the height direction of the cylindrical battery is too large, which leads to a large interference amount, reduces the assembly efficiency of the battery cover 20 and the housing 10, and after the battery cover 20 and the housing 10 are assembled, the positioning part 23 is prone to squeezing and deforming the housing 10, which affects the safety performance of the cylindrical battery.

[0070] It is worth noting that by limiting the ratio of D2 / D1, the positioning function of the positioning part 23 is guaranteed while preventing the positioning part 23 from squeezing and deforming the housing 10.

[0071] In one embodiment, the diameter of the cover plate body 21 is D0, which satisfies 32mm≤D0≤56mm, and the number of positioning parts 23 is N, which satisfies 4≤N≤16.

[0072] It should be noted that the larger the diameter D0 of the cover body 21, the more difficult it is to achieve precise positioning. Therefore, when the diameter of the cover body 21 increases, the number of positioning parts 23 also needs to be increased accordingly; when the diameter of the cover body 21 decreases, the number of positioning parts 23 also needs to be reduced accordingly.

[0073] Optionally, the diameter D0 of the cover body 21 can be any value among 32mm, 40mm, 44mm, 46mm, 48mm, 50mm, and 56mm, or a value between any two of these values.

[0074] Optionally, the number N of the positioning units 23 can be any value among 4, 6, 8, 12, 14, and 16, or a value between any two values.

[0075] For example, in the first embodiment, the diameter D0 of the cover plate body 21 is 35mm, and the number of positioning parts 23 is six, with the six positioning parts 23 evenly spaced along the outer peripheral wall of the boss 22; in the second embodiment, the diameter D0 of the cover plate body 21 is 54mm, and the number of positioning parts 23 is fourteen, with the fourteen positioning parts 23 evenly spaced along the outer peripheral wall of the boss 22.

[0076] It is worth noting that the adaptability of the battery cover 20 is improved by coordinating the diameter of the cover body 21 with the number of positioning parts 23.

[0077] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A cylindrical battery, characterized in that, include: A housing (10), at least one end of which has an opening (13); A battery cover (20) is connected to the housing (10) and blocks the opening (13). The battery cover (20) includes a cover body (21), a boss (22) and a positioning part (23). The boss (22) is connected to the cover body (21) and is located on the side of the cover body (21) close to the housing (10). The positioning part (23) is connected to the outer peripheral wall of the boss (22). At least a portion of the positioning part (23) on the side away from the boss (22) abuts against the inner wall of the housing (10).

2. The cylindrical battery according to claim 1, characterized in that, The positioning part (23) is provided as one, and the positioning part (23) is continuously provided along the circumference of the boss (22); or, The positioning part (23) is provided as one, and the positioning part (23) is provided corresponding to the outer peripheral portion of the boss (22); or, A plurality of positioning portions (23) are provided at circumferential intervals along the boss (22).

3. The cylindrical battery according to claim 2, characterized in that, Several of the positioning parts (23) are evenly spaced along the circumference of the boss (22).

4. The cylindrical battery according to claim 2, characterized in that, Several positioning parts (23) are symmetrically arranged on the boss (22), and the number of positioning parts (23) is 2n, satisfying 1≤n≤8.

5. The cylindrical battery according to any one of claims 1-3, characterized in that, Along the height direction of the cylindrical battery, the thickness of the positioning part (23) is T1, the thickness of the boss (22) is T2, T1 < T2, the side of the boss (22) away from the cover plate body (21) is the first surface (221), and the positioning part (23) is disposed close to the first surface (221).

6. The cylindrical battery according to any one of claims 1-3, characterized in that, Along the height direction of the cylindrical battery, the thickness of the positioning part (23) is T1, the thickness of the boss (22) is T2, T1 < T2, the side of the boss (22) away from the cover plate body (21) is the first surface (221), and the side of the boss (22) close to the cover plate body (21) is the second surface (222). Along the height direction of the cylindrical battery, the positioning part (23) is disposed between the first surface (221) and the second surface (222).

7. The cylindrical battery according to any one of claims 1-3, characterized in that, A contact surface (231) is formed on the positioning part (23), the contact surface (231) abuts against the housing (10), and the contact surface (231) is an arc-shaped surface.

8. The cylindrical battery according to any one of claims 1-3, characterized in that, Along the tangent direction of the connection point between the positioning part (23) and the boss (22), the width of the positioning part (23) is W, which satisfies 0.1mm≤W≤0.5mm.

9. The cylindrical battery according to any one of claims 1-3, characterized in that, Along the height direction of the cylindrical battery, the thickness of the positioning part (23) is T1, which satisfies 0.3mm≤T1≤1.2mm.

10. The cylindrical battery according to any one of claims 1-3, characterized in that, The inner diameter of the housing (10) is D1, and the diameter of the circumscribed circle of the positioning part (23) in the orthographic projection along the height direction of the cylindrical battery is D2, satisfying 1≤D2 / D1≤1.

05.

11. The cylindrical battery according to claim 2, characterized in that, The diameter of the cover plate body (21) is D0, which satisfies 32mm≤D0≤56mm, and the number of the positioning parts (23) is N, which satisfies 4≤N≤16.

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