Thread-sealed high-energy-density cylindrical battery

Abstract

A thread-sealed high-energy-density cylindrical battery belongs to the technical field of batteries, and comprises a shell, a roll core, a sealing ring and a sealing cover, internal threads on the shell are in threaded connection with external threads on the sealing cover, so that the firmness and leakproofness of sealing are ensured, meanwhile, the internal space of a battery cell is saved, and the capacity and energy density of the battery cell are improved; in addition, the sealing structure in the utility model avoids the defects of weld penetration, liquid leakage and high reject ratio caused by unstable laser welding of the shell and the sealing cover; 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 threaded-sealed high-energy-density cylindrical battery. 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 utility model provides a high energy density cylindrical battery with threaded sealing.

[0004] A high-energy-density cylindrical battery with threaded sealing, comprising: a casing, a core, a sealing ring, and a sealing cap; the casing is a metal cylindrical shell, one end of which is an electrode end with an integrally formed electrode; the core is disposed inside the casing and is electrically connected to the electrode; the other end of the casing is a sealing end, the opening of which is made of a variable diameter process, the wall thickness of the variable diameter section is greater than that of the bottom of the casing without a variable diameter section, and the inner wall of the sealing end is provided with an internal thread in the circumferential direction; the sealing ring is disposed on the sealing cap, the outer wall of the sealing cap is provided with an external thread 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 has an extended edge in the radial direction, and an annular groove is provided on the extended edge; 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 seal.

[0008] Preferably, the extended side is further provided with a machining groove.

[0009] Preferably, the sealing cap is made of a conductive material, including but not limited to: metal materials and alloys.

[0010] 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.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] The technical solution provided by this utility model includes: a shell, a core, a sealing ring, and a sealing cap. The internal thread on the shell and the external 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 laser welding instability, 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

[0013] Figure 1 This is a vertical cross-sectional view of the cylindrical battery in this utility model;

[0014] Figure 2 This is a schematic diagram of the threaded connection between the sealing cap and the housing in this utility model;

[0015] Figure 3 This is a schematic diagram of the sealing cap structure in this utility model;

[0016] Figure 4 This is a schematic diagram of the shell structure in this utility model;

[0017] Figure 5 This is an exploded view of the cylindrical battery structure 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-external thread; 8-ring groove; 9-machined groove; 10-internal 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 high-energy-density cylindrical battery with threaded sealing is shown in the schematic diagram 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 a diameter-changing process at the opening of the sealing end. The wall thickness at the diameter-changing part is greater than that at the bottom of the housing 1 without diameter changing. Simultaneously, the inner wall of the sealing end has an internal thread 10 circumferentially arranged. The sealing ring 3 is disposed on the sealing cover 4. The structural schematic diagram of the sealing cover 4 is shown below. Figure 3 As shown, the outer wall of the sealing cap 4 is provided with external threads 7 in the circumferential direction, which are 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 are not limited to the shape and number shown in the figure. The grooves 6 can increase the strength of the cover plate and the contact with the core during welding. The position diagram of the welding grooves 6 is shown in the figure. Figure 3 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 has an extended edge in the radial direction, and an annular groove 8 is provided on the extended edge; 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 extended side is also provided with a machining groove 9 for subsequent thread locking operations.

[0025] The sealing cap 4 is made of conductive material, including but not limited to: metal and alloy.

[0026] 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.

[0027] In terms of manufacturing process, after the core 2 is placed into the housing 1, sealant is applied to the internal thread 10 at the opening of the housing 1. Then, the sealing cover 4, which contains the sealing ring 3, is screwed onto the housing 1 by the thread. The thread can be locked by the groove 9 processed on the sealing cover 4. Then, laser welding is used to further weld the end of the sealing cover 4 and the internal core 2 through the welding groove 6 on the sealing cover. 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.

[0028] 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 threaded-sealed high-energy-density cylindrical battery, 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. The opening of the sealing end is made of a diameter change process. The wall thickness of the diameter change part is greater than that of the bottom of the housing (1) without diameter change. At the same time, the inner wall of the sealing end is provided with an internal thread (10) in the circumferential direction. The sealing ring (3) is disposed on the sealing cover (4). The outer wall of the sealing cover (4) is provided with an external thread (7) in the circumferential direction and is threadedly connected to the sealing end of the housing (1).

2. A threaded-sealed high-energy-density cylindrical battery 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 threaded-sealed high-energy-density cylindrical battery 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 threaded-sealed high-energy-density cylindrical battery as described in claim 1, characterized in that, The sealing cap has an extended side in the radial direction, and an annular groove (8) is provided on the extended side. 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 threaded-sealed high-energy-density cylindrical battery as described in claim 4, characterized in that, The extended side is also provided with a machining groove (9).

6. A threaded-sealed high-energy-density cylindrical battery as described in claim 1, characterized in that, The sealing cap (4) is made of conductive material, including but not limited to: metal material and alloy.

7. A threaded-sealed high-energy-density cylindrical battery as described in claim 1, characterized in that, The material of the sealing ring (3) includes, but is not limited to: PP material, fluororubber material, and EPDM material.

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