CN219303802U

CN219303802U - All-welded cylindrical energy storage monomer

Info

Publication number: CN219303802U
Application number: CN202320892515.1U
Authority: CN
Inventors: 李剑锋; 元金石; 辛民昌; 张元赛; 杨晓彬
Original assignee: Jiuhuan Times Battery Co ltd
Current assignee: Jiuhuan Times Battery Co ltd
Priority date: 2023-04-19
Filing date: 2023-04-19
Publication date: 2023-07-04
Anticipated expiration: 2033-04-19

Abstract

The utility model discloses an all-welded cylindrical energy storage monomer which comprises a shell and an energy storage battery cell arranged in the shell, wherein the first end of the shell is provided with an opening, the first end of the energy storage battery cell is provided with a first electrode assembly, and the second end of the energy storage battery cell is provided with a second electrode assembly; the first electrode assembly comprises a first current collecting piece and an end cover assembly, the first current collecting piece is connected with a first foil arranged at the first end of the energy storage battery cell, a first pole is arranged on the first current collecting piece, the end cover assembly comprises an end cover ring, an end cover plate and an insulating piece, the end cover ring is sleeved on the first pole and is welded and fixed with the first pole, the end cover plate covers the opening of the shell and is welded and fixed with the shell, the inner diameter of the end cover plate is larger than the outer diameter of the end cover ring, and the insulating piece is arranged between the end cover ring and the end cover plate. The all-welded cylindrical energy storage monomer can meet the sealing requirement and has better sealing reliability.

Description

All-welded cylindrical energy storage monomer

Technical Field

The utility model belongs to the technical field of electric energy storage, and particularly relates to an all-welded cylindrical energy storage monomer.

Background

The sealing structure of the existing cylindrical battery is complex in most structure, and as disclosed in China patent with publication number of CN211238405U, the sealing structure of the improved cylindrical lithium battery comprises a sealing ring, wherein the sealing ring comprises a sealing ring top wall, a sealing ring side wall and a sealing ring bottom wall, a cap, a PTC protection ring, a large aluminum sheet and a CID small aluminum sheet which are overlapped are sequentially sleeved in the sealing ring from top to bottom, the CID small aluminum sheet is welded to the bottom of the large aluminum sheet, the sealing ring top wall and the sealing ring bottom wall clamp the outer sides of the cap, the PTC protection ring and the large aluminum sheet, and the outer peripheral walls of the cap, the PTC protection ring and the large aluminum sheet are all attached to the inner peripheral wall of the sealing ring. Although the improved sealing structure of the cylindrical lithium battery can improve the anti-drop and anti-collision performance to a certain extent, the sealing structure still has the following defects:

1) The sealing effect can be achieved only by configuring the sealing ring with a specific special structure, and the sealing ring is easy to age after long-time use, so that the sealing performance is reduced and even fails;

2) The electrode is led out and a plurality of parts such as a cap, a large aluminum sheet, a CID small aluminum sheet, a PTC protection ring and the like are required to be configured, so that the structure is complex, and the production cost is high.

Disclosure of Invention

In view of the above, the utility model aims to provide an all-welded cylindrical energy storage monomer which can meet the sealing requirement and has better sealing reliability.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

the all-welded cylindrical energy storage monomer comprises a shell and an energy storage battery cell arranged in the shell, wherein the first end of the shell is provided with an opening, the first end of the energy storage battery cell is provided with a first electrode assembly, and the second end of the energy storage battery cell is provided with a second electrode assembly; the first electrode assembly comprises a first current collecting piece and an end cover assembly, the first current collecting piece is connected with a first foil arranged at the first end of the energy storage battery cell, a first pole is arranged on the first current collecting piece, the end cover assembly comprises an end cover ring, an end cover plate and an insulating piece, the end cover ring is sleeved on the first pole and is welded and fixed with the first pole, the end cover plate covers the opening of the shell and is welded and fixed with the shell, the inner diameter of the end cover plate is larger than the outer diameter of the end cover ring, and the insulating piece is arranged between the end cover ring and the end cover plate.

Further, the end cover ring, the end cover plate and the insulating piece are integrally formed.

Further, the energy storage battery core is manufactured in a winding mode, and an adhesive tape is wound outside the energy storage battery core.

Further, the first current collecting sheet and the first foil are welded and fixed.

Further, the second electrode assembly includes a second current collector connected to a second foil disposed at a second end of the energy storage cell.

Further, a second pole is arranged on the second current collecting piece, a through hole for the second pole to pass through is arranged at the bottom of the shell, and the second pole extends out of the shell along the direction that the first end points to the second end.

Further, the second current collecting piece is welded with the bottom of the shell; the end cover plate is provided with a second electrode lead-out pin; and a first electrode lead-out pin is welded on the first pole.

Further, the first pole is provided with a liquid injection hole, and a sealing rubber plug is arranged in the liquid injection hole.

Further, the first pole or the second pole is provided with a liquid injection hole, and a sealing rubber plug and a liquid injection seal are arranged in the liquid injection hole.

Further, the second current collecting sheet and the second foil are welded and fixed.

The utility model has the beneficial effects that:

according to the all-welded cylindrical energy storage monomer, the first electrode assembly is arranged at the first end of the energy storage battery core, and the first electrode post is arranged on the first current collecting plate, so that an electrode can be directly led out; through establishing the end cover subassembly into end cover ring, end cover plate and be located the insulating part between end cover ring and the end cover plate to with end cover ring and first utmost point post welded fastening, with end cover plate and shell welded fastening, so, can satisfy first utmost point post with the insulating requirement between the shell, simultaneously through welded mode, can guarantee sealing performance, and whole seal structure does not all adopt sealing member such as sealing washer, but realize through welded mode, not only can satisfy sealing performance requirement, and sealing performance's reliability is better, simultaneously can simplify the structure with reduction in manufacturing cost.

Drawings

In order to make the objects, technical solutions and advantageous effects of the present utility model more clear, the present utility model provides the following drawings for description:

FIG. 1 is a schematic structural diagram of an embodiment 1 of an all-welded cylindrical energy storage cell of the present utility model;

fig. 2 is a schematic structural diagram of embodiment 2 of an all-welded cylindrical energy storage cell according to the present utility model.

Reference numerals illustrate:

10-a housing; 11-an energy storage cell; 12-adhesive tape; 13-a first foil; 14-a second foil; 15-a first current collector sheet; 16-a first pole; 17-end cap ring; 18-end cover plates; 19-an insulator; 20-a second current collector; 21-a second pole; 22-a liquid injection hole; 23-sealing the rubber plug; 24-filling and sealing; 25-bulge; 26-a second electrode lead; 27-a first electrode lead; 28-explosion-proof valve.

Detailed Description

The present utility model will be further described with reference to the accompanying drawings and specific examples, which are not intended to limit the utility model, so that those skilled in the art may better understand the utility model and practice it.

Example 1

As shown in fig. 1, the all-welded cylindrical energy storage unit of the present embodiment includes a housing 10 and an energy storage cell 11 installed in the housing 10. The energy storage battery core 11 of the embodiment is manufactured in a winding manner, and the adhesive tape 12 is wound outside the energy storage battery core 11, and the two ends of the energy storage battery core 11 are respectively provided with a first foil 13 and a second foil 14. The first end of the housing 10 is provided with an opening, the first end of the energy storage cell 11 is provided with a first electrode assembly, and the second end is provided with a second electrode assembly.

Specifically, in this embodiment, the first electrode assembly includes a first current collecting plate 15 and an end cap assembly, and after the first foil 13 is flattened, the first current collecting plate 15 is connected to the first foil 13 disposed at the first end of the energy storage cell 11. In this embodiment, the first current collecting plate 15 and the first foil 13 are connected by laser welding. The first current collecting plate 15 of this embodiment is provided with a first pole 16, the end cover assembly includes an end cover ring 17, an end cover plate 18 and an insulating member 19, the end cover ring 17 is sleeved on the first pole 16 and welded to the first pole 16, the end cover plate 18 covers the opening of the housing 10 and welded to the housing 10, the inner diameter of the end cover plate 18 is larger than the outer diameter of the end cover ring 17, and the insulating member 19 is disposed between the end cover ring 17 and the end cover plate 18. In this embodiment, the end cap ring 17, the end cap plate 18 and the insulator 19 are integrally formed for ease of assembly. In this embodiment, the end cover ring 17 and the end cover plate 18 are made of metal materials, the insulating member 18 is made of phenolic resin materials, and in the manufacturing process, the insulating member 19, the end cover ring 17 and the end cover plate 18 are preformed into a whole by adopting an integral molding process so as to facilitate assembly, meanwhile, the insulating member 19 can be made larger, and the volume and the weight of the end cover ring 17 and the end cover plate 18 made of metal materials are set smaller so as to reduce the weight and save the cost. Specifically, in the case of integral molding, a structure for enhancing the bonding strength with the insulating member 19 may be provided on the end cover ring 17 and the end cover plate 18, and the structure for enhancing the bonding strength may be implemented in various conventional manners, for example, the surface of the end cover ring 17 and the surface of the end cover plate 18 are roughened, or burrs are provided on the surfaces of the end cover ring 17 and the end cover plate 18, or structures such as protrusions or grooves may be provided on the surfaces of the end cover ring 17 and the end cover plate 18, which will not be described.

The second electrode assembly of the present embodiment includes a second current collecting plate 20, and the second current collecting plate 20 is connected to the second foil 14 disposed at the second end of the energy storage cell 11. Specifically, after the second foil 14 is flattened, the connection and fixation between the second current collecting piece 20 and the second foil 14 are realized by adopting a laser welding mode. The second current collecting plate 10 of the present embodiment is provided with a second post 21, the bottom of the housing 10 is provided with a through hole for the second post 21 to pass through, and the second post 21 extends out of the housing 10 along the direction from the first end to the second end. In this embodiment, the second pole 21 and the housing 10 are welded and fixed by laser welding. That is, in the present embodiment, the second electrode assembly can be obtained by only one part of the second current collecting tab 20, which can further reduce the cost.

In order to fill the energy storage battery cell 11, in this embodiment, a filling hole 22 is provided on the first pole 16, and a sealing rubber plug 23 and a filling seal 24 are provided in the filling hole 22. Of course, the liquid injection hole 22 may be disposed on the second pole 21, so as to satisfy the liquid injection requirement, and will not be described again. The casing 10 of this embodiment is also provided with an explosion-proof valve 28.

In this embodiment, the energy storage battery 11 may be a battery cell or a capacitor cell.

Example 2

As shown in fig. 2, the all-welded cylindrical energy storage unit of the present embodiment includes a housing 10 and an energy storage cell 11 installed in the housing 10. The energy storage battery core 11 of the embodiment is manufactured in a winding manner, and the adhesive tape 12 is wound outside the energy storage battery core 11, and the two ends of the energy storage battery core 11 are respectively provided with a first foil 13 and a second foil 14. The first end of the housing 10 is provided with an opening, the first end of the energy storage cell 11 is provided with a first electrode assembly, and the second end is provided with a second electrode assembly.

The second electrode assembly of the present embodiment includes a second current collecting plate 20, and the second current collecting plate 20 is connected to the second foil 14 disposed at the second end of the energy storage cell 11. Specifically, after the second foil 14 is flattened, the connection and fixation between the second current collecting piece 20 and the second foil 14 are realized by adopting a laser welding mode. In addition, the second current collecting tab 20 is provided with a protrusion 25, the bottom of the case 10 is provided with a through hole corresponding to the protrusion 25, the protrusion 25 is positioned in the through hole, and the second current collecting tab 20 is connected with the case 10 by laser welding through the protrusion 25 and the through hole.

The end cap plate 18 of the present embodiment is provided with a second electrode lead-out pin 26; the first electrode pin 27 is welded to the first electrode post 16. Thus, the first electrode lead-out pin 27 and the second electrode lead-out pin 26 are both positioned at the same end, so that the connection to an external circuit is facilitated.

In order to fill the energy storage battery cell 11, the first pole 16 is provided with the filling hole 22, and the first pole 16 is welded with the first electrode lead-out pin 27, so that the first electrode lead-out pin 27 can play a role of the filling seal 24, and only the sealing rubber plug 23 is needed to be arranged in the filling hole 22. Of course, the liquid filling hole 22 may be provided in the second pole 21, and in this case, the sealing rubber stopper 23 and the liquid filling seal 24 need to be provided in the liquid filling hole 22 of the second pole 21.

Other embodiments of this example are the same as example 1, and will not be described in detail.

The above-described embodiments are merely preferred embodiments for fully explaining the present utility model, and the scope of the present utility model is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present utility model, and are intended to be within the scope of the present utility model. The protection scope of the utility model is subject to the claims.

Claims

1. The all-welded cylindrical energy storage monomer comprises a shell and an energy storage battery cell arranged in the shell, wherein the first end of the shell is provided with an opening, the first end of the energy storage battery cell is provided with a first electrode assembly, and the second end of the energy storage battery cell is provided with a second electrode assembly; the method is characterized in that: the first electrode assembly comprises a first current collecting piece and an end cover assembly, the first current collecting piece is connected with a first foil arranged at the first end of the energy storage battery cell, a first pole is arranged on the first current collecting piece, the end cover assembly comprises an end cover ring, an end cover plate and an insulating piece, the end cover ring is sleeved on the first pole and is welded and fixed with the first pole, the end cover plate covers the opening of the shell and is welded and fixed with the shell, the inner diameter of the end cover plate is larger than the outer diameter of the end cover ring, and the insulating piece is arranged between the end cover ring and the end cover plate.

2. The all-welded cylindrical energy storage cell of claim 1, wherein: the end cover ring, the end cover plate and the insulating piece are integrally formed.

3. The all-welded cylindrical energy storage cell of claim 1, wherein: the energy storage battery core is made in a winding mode, and an adhesive tape is wound outside the energy storage battery core.

4. The all-welded cylindrical energy storage cell of claim 1, wherein: and the first current collecting sheet and the first foil are welded and fixed.

5. The all-welded cylindrical energy storage cell according to any one of claims 1-4, wherein: the second electrode assembly comprises a second current collecting plate, and the second current collecting plate is connected with a second foil arranged at the second end of the energy storage cell.

6. The all-welded cylindrical energy storage cell of claim 5, wherein: the second current collecting piece is provided with a second pole, the bottom of the shell is provided with a through hole for the second pole to pass through, and the second pole extends out of the shell along the direction of the first end pointing to the second end.

7. The all-welded cylindrical energy storage cell of claim 5, wherein: the second current collecting piece is welded with the bottom of the shell; the end cover plate is provided with a second electrode lead-out pin; and a first electrode lead-out pin is welded on the first pole.

8. The all-welded cylindrical energy storage cell of claim 7, wherein: the first pole is provided with a liquid injection hole, and a sealing rubber plug is arranged in the liquid injection hole.

9. The all-welded cylindrical energy storage cell of claim 5, wherein: the first pole or the second pole is provided with a liquid injection hole, and a sealing rubber plug and a liquid injection seal are arranged in the liquid injection hole.

10. The all-welded cylindrical energy storage cell of claim 5, wherein: and the second current collecting sheet and the second foil are welded and fixed.