CN213340468U

CN213340468U - Lithium ion battery cell structure

Info

Publication number: CN213340468U
Application number: CN202022025228.XU
Authority: CN
Inventors: 曾辉
Original assignee: Zhejiang Fuda Technology Co ltd
Current assignee: Zhejiang Fuda Technology Co ltd
Priority date: 2020-09-16
Filing date: 2020-09-16
Publication date: 2021-06-01
Anticipated expiration: 2030-09-16

Abstract

The utility model provides a lithium ion battery cell structure, constitute including positive plate, negative pole piece, diaphragm, positive plate, negative pole piece, diaphragm in the structure wherein one or more form naked electric core extending structure when electric core is convoluteed or the final round of ending of lamination, and this naked electric core extending structure can guarantee that electric core recovery process is convenient for discern and automatic clamp is got, guarantees that high-efficient, safe battery disassembles the recovery.

Description

Lithium ion battery cell structure

Technical Field

The utility model relates to a lithium ion battery electricity core field especially relates to a lithium ion battery electricity core structure convenient to retrieve.

Background

At present, a lithium ion battery mainly comprises a positive electrode, a negative electrode, a diaphragm (PE, PP and the like), electrolyte and a packaging film (an aluminum shell and a steel shell); the positive plate, the negative plate and the isolating membrane form a lithium ion battery main body in a laminating, winding and other modes, the isolating membrane is glued after being wound for different turns at the end, and the main body is placed into a packaging film or a battery shell and is packaged.

The battery cell has the following defects: in the process of disassembling and recovering the main body of the lithium ion battery, the aging phenomenon of the inner diaphragm of the lithium battery with the end of service life is found, the port is difficult to identify, the disassembling difficulty is high, great potential safety hazards are brought to the material recovery of the battery, and the recovery efficiency is influenced. In view of the above problems, it is necessary to provide a lithium ion battery cell structure which is convenient to recycle.

Disclosure of Invention

The utility model discloses according to current electric core recovery process potential safety hazard, provide an electric core structure convenient to retrieve, the electric core extension structure that this design adopted disassembles the process at electric core and can be convenient for artifical or automated identification, with the orderly split of electric core, guarantees safety and improves and disassembles efficiency.

In order to achieve the above purpose, the utility model adopts the following technical scheme: the utility model provides an electricity core structure includes naked electric core (1) that positive plate (11), negative pole piece (12) and barrier film (13) are constituteed to and naked electric core extension structure (2), naked electric core extension structure is formed by naked electric core extension (21) and diaphragm extension piece (22) adhesion.

Further, the bare cell (1) can be formed by winding or laminating a positive plate (11), a negative plate (12) and a separation film (13) on each other.

Further, the naked electric core extension part (21) is formed by extending one or more of the positive pole piece (11), the negative pole piece (12) or the isolating membrane (13).

Further, the film extension sheet (22) is at least one selected from PP, PE, PET, PEFT, cellulose film, polyimide film (PI), polyamide film (PA), spandex or aramid film.

Further, the length of the membrane extension sheet (22) can be selected from 0.5-3 weeks around the periphery of the naked battery core.

Further, naked electric core extension (21) and diaphragm extension piece (22) adhesion adopt sticky tape (23) adhesion.

Further, the adhesive tape (23) is selected from one of PI, PET, PTFE, FEP and PFA adhesive tapes.

Further, naked electric core extension structure also can leave white at the afterbody both sides by naked electric core extension anodal aluminium foil, negative pole copper foil or aluminium foil, directly convolutes to electric core outmost constitution.

The utility model discloses beneficial effect as follows: firstly, the naked battery cell winding structure or the lamination structure of the utility model is an extension structure added at the ending part of the positive pole piece, the negative pole piece or the diaphragm, which can prevent the battery cell from aging and bonding together after long-time use and is convenient for safe detachment after the service life of the battery cell is ended; second, electric core structure preparation simple process, easy volume production is convenient for port discernment and automatic clamp when electric core recovery process simultaneously get, helps realizing retrieving automatic disassembling.

Drawings

Fig. 1 is an extension schematic diagram of the lower negative plate of the winding structure of the present invention.

Fig. 2 is the utility model discloses naked electric core extends structure cross-sectional schematic.

Fig. 3 is the utility model discloses positive plate extends the sketch map under the winding structure.

Fig. 4 is a schematic view of the extension of the membrane under the lamination structure of the present invention.

In the figure: 1-naked electric core; 11-positive plate; 12-negative pole piece; 13-a separator; 2-naked electric core extension structure; 21-a bare cell extension; 22-a membrane extension sheet; 23-adhesive tape;

Detailed Description

The lithium ion battery and the advantageous technical effects thereof according to the present invention will be described in detail below with reference to specific examples and drawings, but the present invention is not limited thereto.

Example 1

As shown in fig. 1, the electric core structure comprises naked electric core 1 of coiling formula, packaging film (not shown), electrolyte (not shown) etc. wherein naked electric core 1 includes positive plate 11, negative pole piece 12, diaphragm 13, winds into electric core 11, barrier film 13, negative pole piece 12 in proper order, and it accomplishes until naked electric core 1. Naked electric core 1 finishes the time, connects diaphragm extension piece 22 at negative pole 12 afterbody, forms naked electric core and extends structure 2, and the manual work of being convenient for or automatic discernment electric core split. As shown in the schematic diagram of the bare cell extension structure of fig. 2, the PET film extension sheet 22 is in parallel contact with the negative electrode sheet 12, and the PI tape 23 is used to connect the extension sheet 22 with the negative electrode 12, so as to ensure the connection firmness.

Example 2

With embodiment 1, as shown in fig. 3, when the electric core is terminated, the end of the positive plate electrode plate 11 is divided into a double-sided white aluminum foil structure, and the electric core is directly wound to the outermost layer of the electric core to form an aluminum foil extension sheet 3, so as to replace the original partial diaphragm to form a naked electric core extension structure, and meanwhile, the electric core can also be stabilized.

Example 3

Like embodiment 1, at the final part of electric core ending, the diaphragm can form the extension structure through diaphragm extension pieces such as PTFE sticky tape bonding connection PE, plays final discernment's effect.

Example 4

As shown in fig. 4, the bare cell is a lamination structure, the positive plate 11, the negative plate 12 and the isolation film 13 form a cell according to a zigzag lamination, and at the tail of the cell, the diaphragm 13 is bonded and connected with the PEFT membrane extension sheet through the FEP adhesive tape to form an identifiable bare cell extension structure.

Comparative example 1

The same as example 1 was repeated, except that the stretch panel winding was not performed.

Examples 1 to 4 and comparative example 1 were charged to a voltage of 4.2V with a constant current of 1C rate, and then charged to a current of 0.1C with a constant voltage; and during discharging, 1C constant current is adopted to discharge until the voltage is 2.8V, and the discharge is stopped when the final counted capacity is attenuated to 80% of the first discharge specific capacity. Then, the battery core is disassembled manually, difficulty and safety in disassembling are inspected, and test results are shown in table 1.

TABLE 1 results of manual disassembly of cells

Serial number	Example 1	Example 2	Example 3	Example 4	Comparative example 1
						Difficulty of splitting	Easy port identification	Easy port identification	Easy port identification	Easy port identification	Port septum aging
Safety feature	Safe disassembly	Safe disassembly	Safe disassembly	Safe disassembly	There is a risk of disassembly of the port

To sum up, the utility model relates to a lithium ion battery cell structure convenient to retrieve, positive plate, negative pole piece, diaphragm wherein one or more in naked electric core at electric core coiling or the final contained extension structure that increases of lamination, this extension structure be convenient for artifical or automatic identification, ensure that electric core split safety just improves and disassembles efficiency.

Claims

1. The utility model provides a lithium ion cell structure includes naked electric core (1) that positive plate (11), negative pole piece (12) and barrier film (13) are constituteed to and naked electric core extends structure (2), its characterized in that: naked electric core extension structure (2) adopt sticky tape (3) adhesion to constitute by naked electric core extension (21) and diaphragm extension piece (22).

2. The cell structure of claim 1, wherein: the bare cell (1) can be formed by winding or laminating a positive plate (11), a negative plate (12) and a separation film (13) mutually.

3. The cell structure of claim 1, wherein: the naked electric core extension portion (21) is formed by extending one or more of a positive plate (11), a negative plate (12) or a separation film (13).

4. The cell structure of claim 1, wherein: the length of the membrane extension sheet (22) can be selected from 0.5-3 weeks around the periphery of the naked battery cell.

5. The cell structure of claim 1, wherein: naked electric core extension structure (2) also can be left white at the afterbody both sides by naked electric core extension (21) anodal aluminium foil, negative pole copper foil or aluminium foil, and direct coiling is outmost to constitute of electric core.