Cylindrical secondary battery and electric equipment thereof
By setting a neck and groove between the positive current collector and the tail body, and a reference hole, the coaxiality problem caused by welding errors between the positive current collector and the cap in battery manufacturing is solved, thereby improving battery safety and production efficiency.
Patent Information
- Application Number
- CN202520077467.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-14
- Publication Date
- 2026-02-27
- Estimated Expiration
- 2035-01-14
AI Technical Summary
During battery manufacturing, the cumulative welding errors between the positive electrode current collector, the core, and the cap cause the cap and the steel shell to be out of sync when the cap is inserted into the shell, making insertion difficult. Furthermore, it is impossible for humans to judge in time whether the bending position is reasonable, which increases waste in battery manufacturing.
A neck is set between the positive current collector and the tail, and a groove and a reference hole are opened on the tail. The neck is guided by bending and the position is judged manually. The neck is used to quickly melt and form an open circuit when the battery is short-circuited, ensuring bending consistency and safety.
This achieves consistency and safety in the bending position of the positive electrode current collector, avoids the problem of misalignment when the cap is inserted into the casing, reduces battery manufacturing waste, and improves battery safety performance and production efficiency.
Smart Images
Figure CN223956591U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to cylindrical battery technical field, specifically relates to a cylindrical secondary battery and electric equipment thereof. BACKGROUND
[0002] In the related art, the positive current collector disc is a commonly used component for connecting the winding core and the cap in the battery. In the secondary battery, one end of the positive current collector disc is connected to the positive side of the winding core, and the other end is welded to the cap. Then, the cap is inserted into the shell, the positive current collector disc is bent and completely enters the inside of the battery, and the electrical connection between the cap and the winding core is achieved.
[0003] The positioning of the positive current collector disc and the cap is difficult, and a tooling device is needed to achieve accurate positioning. However, due to the deviation of the tooling and the device, the cumulative deviation causes the positive current collector disc to be difficult to insert into the shell after being welded to the cap. Due to the welding deviation, the cap and the steel shell are not coaxial when the cap is inserted into the shell. At the same time, the positive current collector disc has no position positioning when it is bent into the shell. The device can only be bent, and the human cannot judge whether the bent position is reasonable in the first time, which increases the waste in battery manufacturing.
[0004] Therefore, it is urgent to design a cylindrical secondary battery to solve the technical problem that the welding error of the positive current collector disc and the winding core and the cap accumulates when the positive current collector disc is installed during the battery manufacturing process, causing the cap and the steel shell to be not coaxial when the cap is inserted into the shell.
[0005] It should be noted that the above information disclosed in the background section is only used to understand the background of the present application, and therefore, it can contain information that does not constitute prior art. CONTENT OF THE UTILITY MODEL
[0006] The present disclosure provides at least a cylindrical secondary battery and electric equipment thereof.
[0007] In a first aspect, the present disclosure provides a cylindrical secondary battery, comprising: a positive current collector disc, comprising a disc body adapted to be connected to a winding core and a tail body adapted to be connected to a cap, the cap having a bottom plate center hole;
[0008] Wherein, the tail body is arranged away from the disc body at one end of the bottom plate center hole, and the coverage area is 10%-100% of the area of the bottom plate center hole;
[0009] The disc body and the tail body have a neck portion therebetween;
[0010] The width of the neck portion is less than the minimum width of the tail body.
[0011] In an alternative embodiment, two grooves are formed at the joint between the tail body and the disc body to form a neck.
[0012] In an alternative embodiment, the length of the neck is 1-2mm.
[0013] The width of the neck is 2-4mm.
[0014] In an alternative embodiment, the angle between the neck and the disc body is 60°-100°.
[0015] In an alternative embodiment, a plurality of round holes are formed on the disc body.
[0016] In an alternative embodiment, the thickness of the disc body is 0.1-1mm.
[0017] In an alternative embodiment, the coverage area of the disc body and the winding core is 45%-75% of the top surface area of the winding core.
[0018] In an alternative embodiment, the diameter of the center hole of the bottom plate is 1.5-3.5mm.
[0019] In an alternative embodiment, a contrast hole is formed on the tail body, and the contrast hole is concentric with the center hole of the bottom plate.
[0020] The diameter of the contrast hole is 0.5-1.5mm.
[0021] In an alternative embodiment, the distance between the axis of the contrast hole and the edge of the tail body away from the disc body is 1-3mm.
[0022] In an alternative embodiment, the distance between the center point of the line connecting the width direction of the end of the neck close to the disc body and the center point of the disc body is 3.4-8.4mm.
[0023] In a second aspect, the embodiments of the present disclosure further provide a power consuming device comprising the cylindrical secondary battery.
[0024] The present application has the advantages that the neck is arranged between the disc body and the tail body of the positive current collector, which facilitates manual bending, and can guide the bending and facilitate visual judgment of the bending position.
[0025] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art upon examination of the following or can be learned from practice of the present application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
[0026] In order to make the above object, features and advantages of the present application more obvious, the following preferred embodiments are described in detail, and the accompanying drawings are described as follows. BRIEF DESCRIPTION OF DRAWINGS
[0027] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description, and obviously, the drawings described in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.
[0028] Figure 1 A front view of a positive current collector disc provided by the embodiment of the present disclosure;
[0029] Figure 2 For Figure 1 A partial enlarged view of part A;
[0030] Figure 3 For Figure 1 A partial enlarged view of part B;
[0031] Figure 4 A schematic diagram of a positive current collector disc and cap covering state provided by the embodiment of the present disclosure;
[0032] Figure 5 A perspective view of a cylindrical secondary battery provided by the embodiment of the present disclosure.
[0033] In the drawings:
[0034] 1, positive current collector disc; 2, disc body; 21, round hole;
[0035] 3, tail body; 31, contrast hole; 4, groove;
[0036] 5, cap; 51, bottom plate center round hole;
[0037] 6, neck; 7, roll core. DETAILED DESCRIPTION
[0038] In order to make the object, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme of the present application will be described clearly and completely in conjunction with the drawings, and obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.
[0039] The research shows that the positive current collector disc is bent into the shell without position positioning, and can only rely on the equipment to bend, and the manual cannot judge whether the bending position is reasonable in the first time, thereby increasing the waste in the battery manufacturing.
[0040] The defects of the above solutions are the results of the inventors after practice and careful research, and therefore, the discovery process of the above problems and the solutions proposed by the present disclosure to solve the above problems should be the contribution of the inventors to the present disclosure.
[0041] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the case of no conflict, the embodiments described below and the features in the embodiments can be combined with each other. In addition, in the drawings, in order to effectively describe the technical content, the thickness of the components can be exaggerated or reduced.
[0042] It should be noted that: similar reference numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.
[0043] Based on the above research, the present embodiment provides a cylindrical secondary battery, comprising: a shell, a cap 5, a positive current collector disc 1 and a negative current collector disc, and a roll core 7 located inside the shell, the negative electrode end and the roll core 7 are electrically connected through the negative current collector disc, and the cap 5 and the roll core 7 are electrically connected through the positive current collector disc 1.
[0044] Referring to Figure 1 In at least one embodiment, in order to facilitate the bending position of the positive current collector disc 1 to be consistent, the positive current collector disc 1 comprises a disc body 2 adapted to be connected with the roll core 7 and a tail body 3 adapted to be connected with the cap 5. The disc body 2 and the tail body 3 have a neck portion 6 therebetween. The width of the neck portion 6 is smaller than the minimum width of the tail body 3. Through the above setting, when the positive current collector disc 1 is bent, due to the small width of the neck portion 6, the neck portion 6 will first appear bending under the bending force, so as to ensure that the bending always occurs at the position of the neck portion 6 when bending, thereby ensuring the consistency of the bending position when manually bending.
[0045] Referring to Figure 2 In at least one embodiment, two grooves 4 are mirror-symmetrically provided at the connection between the tail body 3 and the disc body 2 to form the neck portion 6. The groove 4 also serves as a mark, and after the positive current collector disc 1 is bent, the staff can also judge whether the bending is accurate according to whether the neck portion 6 is consistent with the actual bending position. A plurality of round holes 21 are provided on the disc body 2, and electrolyte can be added into the roll core 7 through the round holes 21, or when the roll core 7 is out of control, the round holes 21 can be used for venting.
[0046] Referring to Figure 2In at least one embodiment, the width of the neck 6 is denoted as W, and W ranges from 2 mm to 4 mm. If W < 2 mm, the width of the neck 6 is too small, and the strength is insufficient, and the neck 6 is prone to deformation and fracture. If W > 4 mm, the width of the safety protection structure is too wide, and the width of the neck 6 is too large. When a large current passes through the battery due to short circuit, the neck 6 cannot be fused in time to form a circuit, and the safety performance of the battery is reduced. That is, by setting the width of the neck 6 to be between 2 mm and 4 mm, the neck 6 can be quickly fused to form a circuit under the expected strength condition when the battery is short-circuited, thereby achieving the effect of protecting the battery.
[0047] Referring to Figure 2 In at least one embodiment, the length of the neck 6 is denoted as L, and L ranges from 1 mm to 2 mm. If L < 1 mm, the length of the neck 6 is too short. Since the disc body 2 and the tail body 3 are both metal, the heat conduction capacity is relatively strong. Therefore, when a large current passes through the battery, part of the heat generated is dissipated and consumed by the disc surface and the tail body 3, resulting in low heat accumulation in the neck 6, and the neck 6 cannot be fused for a long time. The safety performance of the battery is reduced, and the safety risk is increased. If L > 2 mm, the length of the neck 6 is too long, and the strength of the neck 6 is too weak. The residual thickness is prone to deformation and fracture.
[0048] Referring to Figure 1 In at least one embodiment, the distance between the center point of the line connecting the width direction of the one end of the neck 6 close to the disc body 2 and the center point of the disc body is 3.4 mm to 8.4 mm.
[0049] Referring to Figure 2 In at least one embodiment, the included angle a between the neck 6 and the disc body 2 ranges from 60° to 100°. If a < 60°, the included angle a is too small, the disc body 2 is too large, the production cost of the positive current collecting disc 1 increases, the weight increases, and after being assembled into the battery, the energy density of the battery decreases. If a > 100°, the weldable area on the disc body 2 welded with the positive side of the winding core 7 becomes smaller, the area of the welding mark decreases, the overcurrent capacity of the welding mark decreases, the temperature rise of the welding position increases during overcurrent, and the performance of the battery decreases.
[0050] Referring to Figure 4 In at least one embodiment, the cylindrical secondary battery further includes a cap 5 having a bottom plate center circular hole 51. The one end of the tail body 3 away from the disc body 2 covers the bottom plate center circular hole 51. The overlapping area of the tail body 3 and the bottom plate center circular hole 51 is used for positioning, so that the position of the positive current collecting disc 1 and the cap 5 cannot be welded off, and the cap 5 can be smoothly inserted into the shell.
[0051] Referring to Figure 4In at least one embodiment, the diameter of the bottom plate center hole 51 is 1.5-3.5 mm. If the diameter is less than 1.5 mm, the welding of the bottom plate and the explosion-proof sheet of the cap 5 itself is affected. If the diameter is greater than 3.5 mm, the welding area of the positive current collector plate 1 and the bottom plate is occupied, resulting in a smaller welding area and a higher welding temperature rise.
[0052] Referring to Figure 4 In at least one embodiment, a reference hole 31 is provided on the tail body 3, and the reference hole 31 is concentrically arranged with the bottom plate center hole 51. The diameter of the reference hole 31 is denoted as D, and the value range of D is 0.5-1.5 mm. If D is less than 0.5 mm, the diameter of the reference hole 31 is too small, which is difficult to process, and it is also difficult to position and distinguish. If D is greater than 1.5 mm, the reference hole 31 is too large, which occupies the welding area of the tail body 3 and the cap 5, affects the overcurrent, and the overcurrent temperature rise becomes larger.
[0053] Referring to Figure 4 In at least one embodiment, the distance from the axis of the reference hole 31 to the edge of the tail body 3 principle plate body 2 is denoted as H, and the value range of H is 1-3 mm. If H is less than 1 mm, the reference hole 31 is too close to the edge of the tail body 3, which affects the forming of the reference hole 31, and the distance between the reference hole 31 and the edge of the tail body 3 is too small, which is easy to break and produce metal chips, and the battery is easy to short circuit. If H is greater than 3 mm, the reference hole 31 occupies the welding area of the tail body 3 and the cap 5, affects the overcurrent, and the overcurrent temperature rise becomes larger.
[0054] Referring to Figure 4 In at least one embodiment, the overlapping area of the tail body 3 and the bottom plate center hole 51 is 10%-100% of the area of the bottom plate center hole 51. If the covered area is less than 10%, the area of the reference hole 31 is too small, which results in a large process difficulty and is difficult to achieve, and the equipment is difficult to capture and position, and manual identification is also difficult. Therefore, by arranging the reference hole 31 on the tail body 3 to position and weld with the bottom plate center hole 51, it is ensured that the reference hole 31 and the bottom plate center hole 51 have the same center, which avoids the welding deviation of the tail body 3 and the cap 5, and causes the cap 5 to be not coaxial with the shell when entering the shell.
[0055] Referring to Figure 5 In at least one embodiment, the covered area of the plate body 2 and the roll core 7 is 45%-75% of the area of the top surface of the roll core 7. The area ratio cannot be too large, which is not conducive to the exhaust of the battery in thermal runaway, and cannot be too small, which is not conducive to the injection of electrolyte into the battery, resulting in ineffective soaking of the battery. It is ensured that the connection stability of the plate body 2 and the roll core 7 is stable, and the position of the plate body 2 is not too deviated to the edge.
[0056] Referring to Figure 5In at least one embodiment, the thickness of the disc body is 0.1-1mm, which is enough to maintain strength and not too difficult to bend manually.
[0057] In addition, the embodiments of the present disclosure also provide a cylindrical secondary battery as shown above.
[0058] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. The above-described device embodiments are only illustrative, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, and for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. Through the above description of the ideal embodiments of the present application, relevant personnel can make various changes and modifications without deviating from the technical concept of the present application. The technical scope of the present application is not limited to the content in the specification, and the technical scope must be determined according to the scope of claims.
Claims
1. A cylindrical secondary battery characterized by comprising: The application relates to a cylindrical secondary battery. The positive current collector disc (1) comprises a disc body (2) suitable for being connected with a winding core (7) and a tail body (3) suitable for being connected with a cover cap (5), and the cover cap (5) has a bottom plate center hole (51). The tail body (3) is arranged at the end away from the disc body (2) and covers the bottom plate center hole (51), and the covering area is 10%-100% of the area of the bottom plate center hole (51). The disc body (2) and the tail body (3) have a neck part (6) therebetween. The width of the neck part (6) is smaller than the minimum width of the tail body (3).
2. The cylindrical secondary battery according to claim 1, wherein Two grooves (4) are symmetrically arranged at the connecting position of the tail body (3) and the disc body (2) to form the neck part (6).
3. The cylindrical secondary battery according to claim 1, wherein The length of the neck part (6) is 1-2 mm. The width of the neck part (6) is 2-4 mm.
4. The cylindrical secondary battery according to claim 1, wherein The included angle between the neck part (6) and the disc body (2) is 60-100 degrees.
5. The cylindrical secondary battery according to claim 1, wherein A plurality of holes (21) are arranged on the disc body (2).
6. The cylindrical secondary battery according to claim 1, wherein The thickness of the disc body (2) is 0.1-1 mm.
7. The cylindrical secondary battery according to claim 1, wherein The covering area of the disc body (2) and the winding core (7) is 45%-75% of the area of the top surface of the winding core (7).
8. The cylindrical secondary battery according to claim 1, wherein The area of the bottom plate center hole (51) is between 1.76mm 2 - 9.62mm 2 .
9. The cylindrical secondary battery according to claim 1, wherein A contrast hole (31) is arranged on the tail body (3), and the contrast hole (31) is concentrically arranged with the bottom plate center hole (51). The diameter of the contrast hole (31) is 0.5-1.5 mm.
10. The cylindrical secondary battery according to claim 9, wherein The distance from the axis of the contrast hole (31) to the edge of the tail body (3) away from the disc body (2) is 1-3 mm.
11. The cylindrical secondary battery according to claim 1, wherein The distance from the center point of the connecting line of the width direction of the end of the neck part (6) close to the disc body (2) to the center point of the disc body (2) is 3.4-8.4 mm.
12. An electric device comprising the cylindrical secondary battery according to any one of claims 1-11.