Cylindrical secondary battery
By setting clearance holes and a clip structure on the bottom shell of the electrode cap, the problem of electrode tabs folding inside the shell is solved, achieving stable connection of the electrode tabs and saving materials, thus improving the safety and sealing of the battery.
Patent Information
- Application Number
- CN202423323297.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-30
- Estimated Expiration
- 2034-12-31
AI Technical Summary
During the connection process between the tab and the cap, the tab is prone to folding inside the outer shell, leading to short circuits and material waste.
The bottom shell of the electrode cap is equipped with clearance holes, which allow the electrode tab to be straightened after it passes through. The electrode tab is fixed by the mating structure between the clamp and the bottom shell, including receiving grooves, positioning bosses and snap-fit protrusions, to ensure stable connection of the electrode tab.
This reduces the possibility of reverse insertion of the tabs, improves connection stability, saves materials, and enhances battery safety and sealing.
Smart Images
Figure CN223858395U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the field of batteries, in particular to a cylindrical secondary battery. BACKGROUND
[0002] Secondary batteries, also known as rechargeable batteries, are a kind of battery that can be recharged by an external power supply after discharge, unlike primary batteries (non-rechargeable batteries), secondary batteries can be used multiple times, so they are more economical and environmentally friendly in many applications, and are widely used in small household appliances and smart wearable devices.
[0003] A conventional secondary battery mainly includes a cell, a shell, and a pole cap, etc., wherein the cell is mainly composed of a positive plate, a separator, and a negative plate stacked in turn, and a tab is arranged at the edge of the positive plate and the edge of the negative plate, respectively, at this time, the cell is assembled by winding and placing it in the shell; at the same time, the pole cap is arranged at the port of the shell and connected with the pole plate, by connecting the two pole caps, under the action of the tab, a passage can be formed.
[0004] For the related technology in the above, when connecting the tab and the pole cap, the tab usually needs to be pre-welded on the inner side of the pole cap, and then the pole cap is fixed on the shell, in this process, in order to facilitate assembly, the tab usually needs to be reserved a certain distance to provide freedom for the pole cap during assembly, however, after the pole cap is installed, the tab inside the shell is usually folded, on the one hand, the folded tab may be inserted into the cell, which may cause short circuit, on the other hand, the folded tab also causes a certain waste of material. UTILITY MODEL CONTENT
[0005] In order to solve the problem of folding the tab inside the shell, the present application provides a cylindrical secondary battery.
[0006] The cylindrical secondary battery provided by the present application adopts the following technical scheme:
[0007] A cylindrical secondary battery, comprising a shell, a cell, and a pole cap, the cell and the pole cap are arranged in the shell, the cell and the pole cap are connected by a tab, the pole cap comprises:
[0008] A bottom shell, the bottom shell is provided with a relief hole, the tab passes through the relief hole and is attached to the surface of the bottom shell;
[0009] And a clamping cover fixedly connected with the bottom shell, for clamping the part of the tab attached to the surface of the bottom shell on the bottom shell.
[0010] By adopting the technical scheme, the tab can be pulled out from the avoiding hole during installation of the pole cap on the shell, and the part of the tab inside the shell can be straightened, so that the tab is not folded and overlapped inside the shell, and the overall length is shortened. On the one hand, the possibility of reverse insertion is reduced, and the use is safer. On the other hand, the length is shortened to save materials, and the problems in the prior art are solved.
[0011] Preferably, the bottom shell is provided with a containing groove in communication with the avoiding hole at one end, and the containing groove is used for containing the tab. The clamping cover is provided with a positioning boss, the positioning boss is inserted and matched with the containing groove, and the tab is pressed and attached to the groove wall of the containing groove.
[0012] By adopting the above scheme, the containing groove can achieve the effect of containing and positioning the tab, so that the tab is not easy to deviate when attached to the bottom shell. At the same time, under the action of the positioning boss, the tab can be stably pressed and attached to the bottom shell to facilitate conduction. In addition, under the action of the positioning boss and the containing groove, the bottom shell and the clamping cover are also positioned relative to each other.
[0013] Preferably, a positioning hole is formed in the groove wall away from the avoiding hole, and the end of the tab is inserted and matched with the positioning hole.
[0014] By adopting the above technical scheme, by inserting the end of the tab into the positioning hole, the end of the tab can be positioned, and the tab can be stably attached to the pole cover.
[0015] Preferably, the positioning boss has a clamping protrusion, and the containing groove is correspondingly provided with a clamping recess, the clamping protrusion and the clamping recess are matched, and the tab is clamped into the clamping recess.
[0016] By adopting the above technical scheme, by clamping the tab into the clamping recess, the friction of the tab can be increased, and the possibility of loosening of the tab can be reduced, and the stability of the tab during connection is optimized and improved.
[0017] Preferably, the clamping protrusion and the clamping recess matched with each other have a plurality of groups, and the plurality of groups of the clamping protrusion and the clamping recess are sequentially and spacedly arranged.
[0018] By adopting the above technical scheme, a plurality of groups of the clamping protrusion and the clamping recess matched with each other are arranged, which can further improve the friction force received by the tab, and the stability of the tab during arrangement is optimized and improved.
[0019] Preferably, the containing groove and the avoiding hole are circularly arc transitioned.
[0020] By adopting the technical scheme, the arc transition accommodating groove and the avoiding hole can guide the tab to be attached to the pole cap in an arc extending manner, so as to reduce the possibility of tab breakage due to excessive bending.
[0021] Preferably, the bottom shell is provided with an annular protrusion, a sealing ring is arranged on the annular protrusion, the annular protrusion is inserted and positioned with the open end of the shell, and the sealing ring abuts against the inner wall of the shell.
[0022] By adopting the technical scheme, the annular protrusion can improve the installation precision and stability of the bottom shell during assembly, and the sealing ring can improve the sealing performance of the pole cap during installation, so that the overall structure of the battery is more stable and safe.
[0023] Preferably, the pole cap and the shell are welded and fixed.
[0024] By adopting the technical scheme, the welding and fixing can ensure high connection stability between the pole cap and the shell, and the battery structure is more firm and reliable.
[0025] In summary, the present application has at least one of the following beneficial technical effects:
[0026] 1. By passing the tab through the avoiding hole, the part of the tab located inside the battery is straightened and the length of the tab inside the battery is shortened, which can reduce the occurrence of reverse insertion and save material by shortening the overall length of the tab.
[0027] 2. Under the action of the clamping protrusion, the tab can be clamped into the clamping recess, and the tab is connected stably.
[0028] 3. The annular protrusion at the bottom shell can improve the installation precision and stability of the bottom shell during assembly, and the sealing ring can improve the sealing performance of the pole cap during installation, so that the overall structure of the battery is more stable and safe. BRIEF DESCRIPTION OF DRAWINGS
[0029] Figure 1 is a structure diagram of a secondary battery in a preferred embodiment of the present application.
[0030] Figure 2 is a sectional view of a secondary battery in a preferred embodiment of the present application.
[0031] Figure 3 is a schematic diagram of the assembly relationship between the tab and the bottom cover in a preferred embodiment of the present application.
[0032] Figure 4 is a structure diagram of a clamping cover in a preferred embodiment of the present application.
[0033] Explanation of reference numerals in the attached drawings: 1. Outer shell; 2. Battery cell; 3. Terminal cap; 31. Bottom shell; 311. Clearance hole; 312. Annular protrusion; 313. Receiving groove; 314. Positioning hole; 32. Clip cover; 321. Positioning boss; 4. Sealing ring; 5. Terminal lug; 6. Snap-fit protrusion; 7. Snap-fit recess; 8. Arc-shaped surface. Detailed Implementation
[0034] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.
[0035] This application discloses a cylindrical secondary battery. (Refer to...) Figure 1 and Figure 2 The battery includes a casing 1, a cell 2, and electrode caps 3. The cell 2 is mainly composed of a separator, a positive electrode plate, and a negative electrode plate stacked together. The structure of the cell 2 is existing technology and will not be described in detail here. Based on this, the cell 2 and the electrode caps 3 are respectively disposed on the casing 1. The cell 2 is inserted into the casing 1 after being wound up, and then the electrode caps 3 are installed at both ends of the casing 1 to complete the battery installation.
[0036] Based on this, to achieve conductivity, the battery also includes tabs 5, and the cell 2 and the cap 3 are connected through tabs 5. Here, to shorten the length of tabs 5 inside the battery, the structure of the cap 3 is adjusted. Specifically, in this embodiment, the cap 3 includes a bottom shell 31 and a cover 32, wherein both the bottom shell 31 and the cover 32 are made of conductive metal, and the bottom shell 31 is provided with clearance holes 311 that pass through both sides. In this embodiment, the clearance holes 311 have a long frame structure, so that they can be adapted to the contour of the tabs 5. In addition, the opening size of the clearance holes is larger than the cross-sectional size of the tabs 5. With the above settings, the tabs 5 can pass through the clearance holes 311.
[0037] At this time, during the connection of the tab 5, one end of the tab 5 is first fixed to the cell 2 during the forming process of the cell 2. After the cell 2 is assembled into the shell 1, and before the cap 3 is installed to the end of the shell 1, the tab 5 is passed through the clearance hole 311. Then, the bottom shell 31 of the cap 3 is fixedly installed to the end of the shell 1. Next, the tab 5 is straightened as much as possible so that the area of the tab 5 inside the shell 1 is straightened to avoid folding or bending of this part. On the one hand, this can prevent the tab 5 from being inserted upside down into the cell 2 and avoid short circuit. On the other hand, it can reduce the overall length of the tab 5 and save the manufacturing material of the tab 5.
[0038] Based on this, after the bottom shell 31 is assembled to the outer shell 1, the tab 5 is bent toward the surface of the bottom shell 31 and attached to the surface of the bottom shell 31. Then, the cover 32 is closed onto the bottom shell 31 and the cover 32 is fixedly connected to the bottom shell 31.
[0039] At this time, the clamping cover 32 and the bottom shell 31 clamp the tab 5 on the bottom shell 31 to achieve fixation of the tab 5, and at this time the tab 5 is in contact with the clamping cover 32, and under this condition, current can be transferred to the clamping cover 32 through the tab 5 and pass through the clamping cover 32 to the electronic device.
[0040] Optionally, according to different electrodes, a pole can be selectively provided on the clamping cover 32 of the positive electrode, and the negative electrode can be provided as a flat plate structure, so as to be in contact with the contact piece of the battery compartment, and the specific arrangement mode is not described herein.
[0041] In the embodiment, to ensure that the structure has good stability, the bottom shell 31 and the clamping cover 32 are fixed by welding, and in the specific welding process, the edge between the bottom shell 31 and the clamping cover 32 can be circumferentially welded. In addition, the pole cap 3 and the shell 1 are also fixed by welding, and the welding mode is also a circumferential welding mode of the shell 1. Based on this, in one embodiment, the pole cap 3 can be installed according to two steps: first, the bottom shell 31 and the clamping cover 32 are fixed to obtain the pole cap 3, and then the entire pole cap 3 is fixed to the shell 1.
[0042] In another embodiment, the bottom shell 31, the clamping cover 32, and the shell 1 can be welded at the same time. Specifically, the bottom shell 31 is placed at the end of the shell 1, the tab 5 is inserted through the bottom shell 31 and attached to the bottom shell 31, and finally the clamping cover 32 is stacked on the bottom shell 31. At this time, the clamping cover 32 is kept in a stacked state by means of a clamp, and welding is performed at the edge position of the three, achieving a fixed connection effect. In this way, the three components can be fixed at one time, and the processing efficiency is high.
[0043] Further, with reference to Figure 2 To improve the overall structural stability and sealing performance of the battery, a ring-shaped protrusion 312 is integrally provided on the side of the bottom shell 31 opposite the clamping cover 32. In the embodiment, the ring-shaped protrusion 312 has a circular ring structure, and its extension profile is adapted to the inner diameter of the shell 1. At this time, the ring-shaped protrusion 312 is inserted and positioned with the open end of the shell 1, so that the pole cap 3 can be accurately positioned with the shell 1 and is not prone to excessive deviation. At the same time, a sealing ring 4 is also provided on the ring-shaped protrusion 312. Specifically, the sealing ring 4 is an elastic sealing ring 4, which is fixedly installed on the outer circumferential surface of the ring-shaped protrusion 312. During the process of inserting the ring-shaped protrusion 312 into the open end of the shell 1, the sealing ring 4 can abut the inner wall of the shell 1 to achieve a sealing effect, so that the electrolyte is not easily spilled, and the overall structural stability and sealing performance of the battery are optimized and improved.
[0044] With reference to Figure 2 and Figure 3In order to avoid the shift of the lug 5 when being attached to the bottom shell 31, thus causing the breakage of the contact, the accommodating groove 313 is recessed on the side surface of the bottom shell 31 facing the clamping cover 32, the accommodating groove 313 is in a strip shape, and one end of the accommodating groove 313 is communicated with the avoiding hole 311, at this time, the width of the accommodating groove 313 can be matched with the width of the lug 5, thus the lug 5 can be accommodated in the accommodating groove 313, and after being folded into the accommodating groove 313, the lug 5 can be positioned by the accommodating groove 313, so as to avoid the left and right shift of the lug 5.
[0045] Further, referring to Figure 4 and combining Figure 2 and Figure 3 , in order to make the lug 5 closely contact with the clamping cover 32 and the bottom shell 31, the positioning boss 321 is arranged at the position of the clamping cover 32 relative to the accommodating groove 313, generally, the positioning boss 321 is arranged integrally with the clamping cover 32, and the contour shape thereof is consistent with the positioning boss 321, in the state that the clamping cover 32 is covered on the bottom shell 31, the positioning boss 321 is inserted and matched with the accommodating groove 313, and the positioning boss 321 presses and attaches the lug 5 to the groove wall of the accommodating groove 313, so as to realize the close attachment and positioning effect.
[0046] Optionally, the positioning hole 314 is arranged at the groove wall of the accommodating groove 313 away from the avoiding hole 311, and the end of the lug 5 away from the battery cell 2 is inserted and matched with the positioning hole 314, at this time, by inserting the end of the lug 5 into the positioning hole 314, the end of the lug 5 can be positioned, and the lug 5 is not easy to be loosened from the accommodating groove 313 in the process of covering the clamping cover 32 on the bottom shell 31, which is beneficial to stably attach the lug 5 on the lug cap.
[0047] Referring to Figure 3 and Figure 4 , in order to further improve the contact stability of the lug 5 and the lug cap 3, the clamping protrusion 6 is arranged at the side surface of the positioning boss 321 facing the accommodating groove 313, the clamping protrusion 6 is in a strip protrusion structure, and correspondingly, the clamping recess 7 is arranged at the accommodating groove 313, the clamping recess 7 is recessed on the groove bottom of the accommodating groove 313, and the recessed contour thereof is consistent with the clamping protrusion 6, at this time, the clamping protrusion 6 can be matched with the clamping recess 7, and in the process of covering the clamping cover 32 on the bottom shell 31, because the lug 5 is located between the clamping protrusion 6 and the clamping recess 7, the clamping protrusion 6 can clamp the lug 5 into the clamping recess 7.
[0048] Based on the above structure, the friction of the lug 5 can be increased, and the possibility of loosening of the lug 5 is reduced, and the stability of the lug 5 during connection is optimized and improved.
[0049] Optionally, the matching clamping protrusions 6 and the clamping recesses 7 have multiple groups, such as two groups, three groups, or four groups, etc. The specific number of clamping protrusions 6 and clamping recesses 7 can be set according to actual needs, which is not limited specifically herein. In this embodiment, the number of clamping protrusions 6 and clamping recesses 7 is set to three groups as an example. When setting, multiple groups of clamping protrusions 6 and clamping recesses 7 need to be set along the length direction of the pole piece.
[0050] Based on the above setting, by setting multiple groups of matching clamping protrusions 6 and clamping recesses 7, the friction force received by the tab 5 can be further improved, and the stability of the tab 5 when setting is optimized and improved.
[0051] In addition, referring to Figure 2 To avoid the tab 5 from being broken during installation, an arc surface 8 can be arranged between the receiving groove 313 and the avoidance hole 311, and the receiving groove 313 and the avoidance hole 311 are circularly arc transitioned. Based on this setting, the circularly arc transitioned receiving groove 313 and avoidance hole 311 can guide the tab 5 to be attached to the pole cap 3 in a circularly arc extending manner, so as to reduce the possibility of the tab 5 being broken due to excessive bending.
[0052] The implementation principle of the cylindrical secondary battery of the embodiment is that during the installation of the pole cap 3 in the shell 1, the tab 5 can be pulled out from the avoidance hole 311, and the part of the tab 5 inside the shell 1 can be straightened. At this time, the tab 5 can be prevented from being bent and folded inside the shell 1, and the overall length is shortened. On the one hand, based on the above setting, the possibility of reverse insertion can be reduced, and the use is safer. On the other hand, the length can also be shortened to save materials, solving the problems existing in the prior art.
[0053] The above are preferred embodiments of the present application, which do not limit the protection scope of the present application. Therefore, any equivalent changes made on the basis of the structure, shape, and principle of the present application should be covered within the protection scope of the present application.
Claims
1. A cylindrical secondary battery comprising a case (1), an electrode group (2), and a cap (3), the electrode group (2) and the cap (3) being provided in the case (1), the electrode group (2) and the cap (3) being connected by a tab (5), characterized in that, The polar cap (3) comprises: A bottom shell (31) provided with an avoiding hole (311) through which the tab (5) passes and adheres to the surface of the bottom shell (31); And a clamping cover (32) fixedly connected with the bottom shell (31) for clamping the part of the tab (5) adhering to the surface of the bottom shell (31) on the bottom shell (31).
2. The cylindrical secondary battery according to claim 1, characterized by: The bottom shell (31) is provided with a containing groove (313) having one end communicated with the avoiding hole (311), and the containing groove (313) is used for containing the tab (5); the clamping cover (32) is provided with a positioning boss (321) which is insertedly matched with the containing groove (313) and used for pressing the tab (5) to the groove wall of the containing groove (313).
3. The cylindrical secondary battery according to claim 2, characterized by: The containing groove (313) is provided with a positioning hole (314) at the groove wall away from the avoiding hole (311), and the end of the tab (5) is insertedly matched with the positioning hole (314).
4. The cylindrical secondary battery according to claim 2, characterized by: The positioning boss (321) has a clamping protrusion (6), and the containing groove (313) is correspondingly provided with a clamping recess (7), the clamping protrusion (6) is matched with the clamping recess (7), and the tab (5) is clamped into the clamping recess (7).
5. The cylindrical secondary battery according to claim 4, characterized by: The clamping protrusion (6) and the clamping recess (7) have multiple groups, and the multiple groups of the clamping protrusion (6) and the clamping recess (7) are sequentially and spacedly arranged.
6. The cylindrical secondary battery according to claim 2, characterized by: The containing groove (313) and the avoiding hole (311) are circularly transitioned.
7. The cylindrical secondary battery according to claim 1, characterized by: The bottom shell (31) is provided with an annular protrusion (312) provided with a sealing ring (4), the annular protrusion (312) is insertedly positioned with the open end of the shell (1), and the sealing ring (4) abuts against the inner wall of the shell (1).
8. The cylindrical secondary battery according to claim 1, characterized by: The polar cap (3) and the shell (1) are welded and fixed.