Cylindrical battery based on thread sealing

Abstract

A cylindrical battery based on threaded sealing belongs to the technical field of batteries and comprises a shell, a roll core, a sealing ring and a sealing cover, external threads on the shell are in threaded connection with internal threads on the sealing cover, firmness and leakproofness of sealing are guaranteed, space in a battery cell is saved, capacity and energy density of the battery cell are improved, and the battery cell is more compact in structure and more compact in structure. According to the sealing structure provided by the utility model, the defects of weld penetration, liquid leakage and high reject ratio caused by unstable laser welding of the shell and the sealing cover are avoided; the sealing cover and the end part of the roll core are directly welded for conduction, so that the use of a collector plate is reduced, the process is simple, the production cost is saved, the occurrence probability of poor conditions such as short circuit caused by insufficient soldering, solder skips and weld penetration due to excessive welding procedures is also reduced, the defect detection efficiency is improved, and the equipment maintenance cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, specifically to a cylindrical battery based on threaded sealing. Background Technology

[0002] Cylindrical batteries, as a type of energy storage battery, store electrical energy through a sealed internal cell. To ensure the effectiveness and safety of cylindrical batteries, the cell needs to be strictly sealed. Therefore, in structural design and manufacturing processes, most adopt the following two forms: grooving + capping. The mechanical compression of the grooving and sealing causes the rubber ring of the cap to deform, thereby sealing the cell. However, grooving and capping greatly occupy the internal space of the casing, thus shortening the length of the core, reducing the cell capacity, and thus lowering the overall energy density of the battery. Alternatively, there is laser welding sealing, which seals the cover plate and casing by peripheral laser welding. While peripheral laser welding does not affect the internal space, laser welding is prone to defects such as sparks, incomplete welds, and weak welds, leading to poor battery sealing and leakage, resulting in a high failure rate. Utility Model Content

[0003] In order to provide a cylindrical battery with high sealing performance and high energy density, this invention provides a cylindrical battery based on threaded sealing.

[0004] A cylindrical battery based on threaded sealing, comprising: a casing, a winding core, a sealing ring, and a sealing cap; the casing is a metal cylindrical shell, one end of the casing is an electrode end, on which an integrally formed electrode is provided, the winding core is disposed inside the casing and is electrically connected to the electrode; the other end of the casing is a sealing end, the outer wall of the sealing end is provided with external threads in the circumferential direction; the sealing ring is disposed on the sealing cap, the inner wall of the sealing cap is provided with internal threads in the circumferential direction, and is threadedly connected to the sealing end of the casing.

[0005] Preferably, the sealing cover is further provided with a number of welding grooves; after the sealing cover is threadedly sealed to the housing, the sealing cover is welded to the winding core through the welding grooves to achieve electrical conductivity with the winding core.

[0006] Preferably, the sealing cover is also provided with annular grooves, so that when the internal pressure of the sealed housing is too high, the sealing cover will rupture at the annular grooves to release the pressure.

[0007] Preferably, the sealing cover is further provided with an annular groove; the annular groove is provided corresponding to the sealing end of the housing, and the sealing ring is disposed in the annular groove and contacts the sealing end of the housing to perform sealing.

[0008] Preferably, the sealing cap is made of a conductive material, including but not limited to: metal materials and alloys.

[0009] Preferably, the material of the sealing ring includes, but is not limited to: PP material, fluororubber material, EPDM material and other polymer materials with equivalent sealing effect.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0011] The technical solution provided by this utility model includes: a shell, a core, a sealing ring, and a sealing cap. The external thread on the shell and the internal thread on the sealing cap are threaded together to ensure the firmness and airtightness of the seal. At the same time, it saves space inside the battery cell, increases the battery cell capacity and energy density. The sealing structure provided by this utility model avoids the disadvantages of unstable laser welding, such as weld penetration and leakage at the weld between the shell and the sealing cap, and a high defect rate. Directly welding the sealing cap and the end of the core together reduces the use of a current collector, simplifies the process, saves production costs, and reduces the probability of short circuits caused by excessive welding processes, such as incomplete welding, missed welding, and weld penetration. It also improves defect detection efficiency and reduces equipment maintenance costs. Attached Figure Description

[0012] Figure 1 This is a vertical cross-sectional view of the cylindrical battery in this utility model;

[0013] Figure 2 This is a schematic diagram of the threaded connection between the sealing cap and the housing in this utility model;

[0014] Figure 3 This is a schematic diagram of the sealing cap structure in this utility model;

[0015] Figure 4 This is a schematic diagram of the shell structure in this utility model;

[0016] Figure 5 This is an exploded view of the cylindrical battery structure in this utility model;

[0017] Figure 6 This is a schematic diagram showing the position of the welding groove in this utility model;

[0018] Among them, 1-shell; 2-core; 3-sealing ring; 4-sealing cap; 5-ring-shaped groove; 6-welding groove; 7-internal thread; 8-ring groove; 9-external thread. Detailed Implementation

[0019] To better understand this utility model, the following description, in conjunction with the accompanying drawings and examples, will further illustrate its contents.

[0020] A cylindrical battery based on threaded seal, the schematic diagram of which is shown below. Figure 1 As shown, the exploded view of the structure is as follows: Figure 5 As shown, it includes: a housing 1, a core 2, a sealing ring 3, and a sealing cap 4; the housing 1 is a metal cylindrical shell, which can be a steel shell or an aluminum shell; a structural schematic diagram of the housing 1 is shown below. Figure 4 As shown, one end of the housing 1 is an electrode post end, with an integrally formed electrode post. The core 2 is disposed inside the housing 1 and is electrically connected to the electrode post. The other end of the housing 1 is a sealing end, with an external thread 9 circumferentially provided on the outer wall of the sealing end. The sealing ring 3 is disposed on the sealing cover 4, and the structural schematic diagram of the sealing cover 4 is shown below. Figure 3 As shown, the inner wall of the sealing cap 4 is provided with an internal thread 7 in the circumferential direction, which is threadedly connected to the sealing end of the housing 1. The schematic diagram of the threaded connection is shown below. Figure 2 As shown.

[0021] The sealing cover 4 is also provided with a number of welding grooves 6, the grooves 6 being not limited to Figure 3 The shape and number of grooves shown indicate that groove 6 can increase the strength of the cover plate and the contact during welding with the core. A schematic diagram of the location of the welding grooves 6 is shown below. Figure 6 As shown; after the sealing cover 4 is threadedly sealed to the housing 1, the sealing cover 4 is welded to the core 2 through the welding groove 6 to achieve electrical conductivity with the core 2.

[0022] The sealing cover 4 is also provided with annular grooves 5 for VENT. When the core 2 inside the sealed housing 1 experiences a short circuit or other abnormality, causing an increase in internal pressure and resulting in excessive internal pressure, the sealing cover 4 will rupture at the annular grooves 5 to release the pressure.

[0023] The sealing cover is also provided with an annular groove 8; the annular groove 8 is provided corresponding to the sealing end of the housing 1, and the sealing ring 3 is provided in the annular groove 8 and contacts the sealing end of the housing 1 to seal.

[0024] The sealing cap 4 is made of conductive material, including but not limited to: metal and alloy.

[0025] The material of the sealing ring 3 includes, but is not limited to: PP material, fluororubber material, EPDM material and other polymer materials with equivalent sealing effect.

[0026] In terms of manufacturing process, after the core 2 is placed into the housing 1, sealant is applied to the external thread 9 at the opening of the housing 1. Then, the sealing cap 4, which contains the sealing ring 3, is screwed onto the housing 1 through the thread. Then, laser welding is used to further weld the sealing cap 4 and the end of the internal core 2 through the welding groove 6 on the sealing cap. Finally, UV glue is injected into the welding groove 6 and cured to further ensure the sealing effect after welding, prevent leakage due to poor welding, and also prevent rust at the welded part.

[0027] Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

Claims

1. A cylindrical battery based on a threaded seal, characterized in that, A cylindrical battery based on threaded seal includes: a casing (1), a core (2), a sealing ring (3), and a sealing cap (4). The housing (1) is a metal cylindrical shell. One end of the housing (1) is a pole end, which is provided with an integrally formed pole. The core (2) is disposed inside the housing (1) and is electrically connected to the pole. The other end of the housing (1) is a sealing end, and the outer wall of the sealing end is provided with an external thread (9) in the circumferential direction. The sealing ring (3) is disposed on the sealing cover (4), and the inner wall of the sealing cover (4) is provided with an internal thread (7) in the circumferential direction, which is threadedly connected to the sealing end of the housing (1).

2. A cylindrical battery based on a threaded seal as described in claim 1, characterized in that, The sealing cap (4) is also provided with a number of welding grooves (6); After the sealing cap (4) is threadedly sealed to the housing (1), the sealing cap (4) is welded to the core (2) through the welding groove (6) to achieve electrical conductivity with the core (2).

3. A cylindrical battery based on a threaded seal as described in claim 1, characterized in that, The sealing cover (4) is also provided with annular grooves (5). When the internal pressure of the sealed housing (1) is too high, the sealing cover (4) will break and release pressure at the annular grooves (5).

4. A cylindrical battery based on a threaded seal as described in claim 1, characterized in that, The sealing cap is also provided with an annular groove (8); The annular groove (8) is provided corresponding to the sealing end of the housing (1), and the sealing ring (3) is provided in the annular groove (8) and contacts the sealing end of the housing (1) to seal.

5. A cylindrical battery based on a threaded seal as described in claim 1, characterized in that, The sealing cap (4) is made of conductive material, which is metal or alloy.

6. A cylindrical battery based on a threaded seal as described in claim 1, characterized in that, The sealing ring (3) is made of PP, fluororubber, or EPDM.

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