CN216648360U - Lithium ion battery cell structure - Google Patents
Lithium ion battery cell structure Download PDFInfo
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- CN216648360U CN216648360U CN202122737960.4U CN202122737960U CN216648360U CN 216648360 U CN216648360 U CN 216648360U CN 202122737960 U CN202122737960 U CN 202122737960U CN 216648360 U CN216648360 U CN 216648360U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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- Y02E60/10—Energy storage using batteries
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Abstract
The utility model belongs to the technical field of battery production and manufacture, and particularly relates to a lithium ion battery cell structure which comprises a first pole piece, a diaphragm and a second pole piece, wherein the first pole piece, the diaphragm and the second pole piece are sequentially superposed and wound to form a bare cell; the first pole piece comprises a first empty foil area and a first coating area; the second pole piece comprises a second empty foil region and a second coated region; first empty paper tinsel district and/or first coating district is provided with first utmost point ear, second coating district is provided with the second utmost point ear, the afterbody of first pole piece is equipped with green glue, green glue is located the outer peripheral face of naked electric core wraps up naked electric core. The utility model improves the safety performance of the quick-charging lithium ion battery by optimizing the battery cell winding structure with the tab middle-arranged/multi-tab structure.
Description
Technical Field
The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a lithium ion battery cell structure.
Background
Nowadays, green, high-efficiency secondary batteries are vigorously developed in various countries. The lithium ion battery as a novel secondary battery has the advantages of large energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large-scale energy storage, electric traffic power supplies and the like. With the coming of the 5G era, consumer lithium ion batteries have met with new development peaks, users pay more attention to the safety performance of fast charging digital products, the life safety of users and the reputation of manufacturers are seriously affected by the occurrence of thermal runaway of fast charging batteries, and the reason for the formation of thermal runaway is mainly short circuit, wherein the internal short circuit is closely related to the production process of lithium batteries.
In order to better meet the requirement on the safety performance of the quick-charging lithium ion battery, a short-circuit mode with the maximum heat generation at a short-circuit point, namely an Al-Anode short-circuit mode, needs to be avoided.
The existing winding structure generally adopts an empty aluminum foil ending, and meanwhile, in order to ensure the tail Overhang of a bare cell, the empty aluminum foil on the long membrane surface of a cathode is inevitably in direct contact with an anode, so that a greater risk is formed on the safety performance of the fast-charging lithium ion battery.
SUMMERY OF THE UTILITY MODEL
The utility model aims to: aiming at the defects of the prior art, the battery cell structure of the lithium ion battery is provided, and the safety performance of the quick-charging lithium ion battery is improved by optimizing the battery cell winding structure with a tab middle/multi-tab structure.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a lithium ion battery cell structure comprises a first pole piece, a diaphragm and a second pole piece, wherein the first pole piece, the diaphragm and the second pole piece are sequentially superposed and wound to form a naked battery cell; the first pole piece comprises a first empty foil area and a first coating area; the second pole piece comprises a second empty foil region and a second coated region; the first empty foil area and/or the first coating area are/is provided with a first tab, the second coating area is provided with a second tab, the tail of the first tab is provided with green glue, and the green glue is located on the outer peripheral face of the naked electric core and wraps the naked electric core.
Preferably, the green glue is adhered to the first empty foil area.
Preferably, at least one end of the first empty foil area or the first coating area in the width direction Y is welded with a first tab.
Preferably, at least one end of the second coating region in the width direction Y is welded to the second tab.
Preferably, the first coating area and the second coating area are respectively provided with a third empty foil area and a fourth empty foil area, the first tab is welded in the third empty foil area, and the second tab is welded in the fourth empty foil area.
Preferably, in the width direction Y, the width of the third empty foil area is less than or equal to the width of the first coating area, and the width of the fourth empty foil area is less than or equal to the width of the second coating area.
Preferably, the first empty foil area is located at one end of the first coating area in the length direction X, and the green glue is connected to the first empty foil area.
Preferably, the second empty foil region is located at one end of the second coating region in the length direction X.
Preferably, the first tab is an aluminum tab, and the second tab is an aluminum-nickel tab.
Preferably, the first pole piece and the second pole piece are both provided with a long membrane surface and a short membrane surface.
The battery has the beneficial effects that the battery comprises a first pole piece, a diaphragm and a second pole piece, wherein the first pole piece, the diaphragm and the second pole piece are sequentially superposed and wound to form a bare cell; the first pole piece comprises a first empty foil area and a first coating area; the second pole piece comprises a second empty foil region and a second coated region; the first empty foil area and/or the first coating area are/is provided with a first tab, the second coating area is provided with a second tab, the tail of the first tab is provided with green glue, and the green glue is located on the outer peripheral face of the naked electric core and wraps the naked electric core. Because the existing winding structure generally adopts hollow aluminum foil ending, in order to ensure the tail Overhang of the naked electric core, the hollow aluminum foil of the long cathode film is inevitably contacted with the anode directly, this creates a greater risk for the safety performance of fast-charging cells, and therefore, the ending structure of bare cells is optimized, the green glue is arranged at the tail part of the first pole piece, the ending is carried out through the green glue, the ending of the empty aluminum foil is cancelled, the tail part Overhang of the naked electric core is ensured, the condition that the empty aluminum foil of the long membrane of the cathode is in direct contact with the anode is avoided, the safety of the battery is improved, in addition, the structure can be suitable for various layers of electric cores, only a double-cutter of the cathode pole piece and a waste recovery device are added on a full-automatic winding machine, automatic production can be realized, and the function of regulating and controlling the tail Overhang can be realized by adjusting the distance between the double cutters, and in addition, the single-side continuous coating can also be realized on the long film surface of the cathode, which is beneficial to improving the utilization rate of coating equipment and personnel. The utility model improves the safety performance of the quick-charging lithium ion battery by optimizing the battery cell winding structure with the tab middle-arranged/multi-tab structure.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic view of the structure of the long film surface and the short film surface of the first pole piece according to the first embodiment of the present invention.
Fig. 2 is a schematic structural view of the long film surface and the short film surface of the second pole piece according to the first embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a bare cell according to a first embodiment of the present invention.
Fig. 4 is a schematic structural view of the long film surface and the short film surface of the first pole piece according to the second embodiment of the present invention.
Fig. 5 is a schematic structural view of the long film surface and the short film surface of the second pole piece according to the second embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a bare cell according to a second embodiment of the present invention.
Fig. 7 is a schematic structural view of the long film surface and the short film surface of the first pole piece according to the third embodiment of the present invention.
Fig. 8 is a schematic structural view of the long film surface and the short film surface of the second pole piece according to the third embodiment of the present invention.
Fig. 9 is a schematic structural diagram of a bare cell in the third embodiment of the present invention.
Wherein the reference numerals are as follows:
1-a first pole piece; 11-a first empty foil zone; 12-a first coating zone; 13-a third empty foil area;
2-a second pole piece; 21-a second empty foil area; 22-a second coating zone; 23-a fourth empty foil area;
3-a separator;
4-naked electric core;
5-a first tab;
6-a second tab;
7-green glue;
x-length direction; y-width direction.
Detailed Description
As used in the specification and in the claims, certain terms are used to refer to particular components. As one skilled in the art will appreciate, manufacturers may refer to a component by different names. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, detachable connections, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The present invention will be described in further detail with reference to fig. 1 to 9, but the present invention is not limited thereto.
Implementation mode one
The first embodiment will be described with reference to the accompanying drawings 1 to 3
The lithium ion battery cell structure comprises a first pole piece 1, a diaphragm 3 and a second pole piece 2, wherein the first pole piece 1, the diaphragm 3 and the second pole piece 2 are sequentially superposed and wound to form a naked battery cell 4; the first pole piece 1 comprises a first empty foil area 11 and a first coated area 12; the second pole piece 2 comprises a second empty foil region 21 and a second coated region 22; first coating district 12 is provided with first utmost point ear 5, and second coating district 22 is provided with second utmost point ear 6, and the afterbody of first pole piece 1 is equipped with green glue 7, and green glue 7 is located the outer peripheral face of naked electric core 4 and wraps up naked electric core 4.
Because the existing winding structure generally adopts the hollow aluminum foil ending, and in order to ensure the tail Overhang of the naked electric core, the hollow aluminum foil on the long film surface of the cathode is inevitably in direct contact with the anode, this creates a greater risk for the safety performance of the fast-charging cell, and therefore, the tailing structure of the bare cell 4 is optimized, the green glue 7 is arranged at the tail part of the first pole piece 1, the green glue 7 is used for ending, the empty aluminum foil ending is cancelled, the bare cell tail Overhang is ensured, the condition that the cathode long film surface empty aluminum foil is directly contacted with the anode is avoided, the improvement of the battery safety is facilitated, in addition, the structure can be suitable for various layers of electric cores, only a double-cutter of the cathode pole piece and a waste recovery device are added on a full-automatic winding machine, automatic production can be realized, and the function of regulating and controlling the tail Overhang can be realized by adjusting the distance between the double cutters, and in addition, the single-side continuous coating can also be realized on the long film surface of the cathode, which is beneficial to improving the utilization rate of coating equipment and personnel.
In the present embodiment, the first electrode plate 1 is a cathode plate, the second electrode plate 2 is an anode plate, the distance between the cathode plate and the ending green tape 7 is 2-5mm, the green tape is composed of a polyester film and a silicone rubber system, and is an adhesive tape applied to the bonding of a printed circuit board and a film, which has good heat resistance, does not peel off, and can be torn off uniformly in different storage environments.
In the lithium ion battery cell structure according to the present invention, the green adhesive 7 is bonded to the first empty foil region 11. Specifically, the first empty foil area 11 is located at an end of the first pole piece 1, and the green glue 7 is adhered to the first empty foil area 11.
In the cell structure of the lithium ion battery according to the present invention, a first tab 5 is formed at one end of the first empty foil region 11 or the first coating region 12 in the width direction Y, and a second tab 6 is formed at one end of the second coating region 22 in the width direction Y, so that the first tab 5 and the second tab 6 are formed at one end of the bare cell 4, and the directions of the two tabs of the bare cell 4 may be the same or different.
In the cell structure of the lithium ion battery according to the present invention, the first coating area 12 and the second coating area 22 are respectively provided with a third empty foil area 13 and a fourth empty foil area 23, the first tab 5 is welded in the third empty foil area 13, and the second tab 6 is welded in the fourth empty foil area 23. In the present embodiment, the third empty foil area 13 and the fourth empty foil area 23 are located at the position approximately in the middle of the pole piece, so that the first tab 5 and the second tab 6 are also located at the position approximately in the middle of the pole piece, which is helpful for improving the electrical performance and the energy density of the battery cell, and improving the performance such as the charging rate and the temperature rise of the battery cell.
In the lithium ion battery cell structure according to the present invention, in the width direction Y, the width of the third empty foil region 13 is smaller than the width of the first coating region 12, and the width of the fourth empty foil region 23 is smaller than the width of the second coating region 22, but the present invention is not limited thereto, and the width of the first coating region 12 and the width of the fourth empty foil region 23 may be adjusted according to actual production requirements.
In the lithium ion battery cell structure according to the present invention, the first empty foil area 11 is located at one end of the first coating area 12 in the length direction X, and the green tape 7 is connected to the first empty foil area 11. Specifically, the first empty foil area 11 is located at an end of the first pole piece 1, and the green glue 7 is adhered to the first empty foil area 11.
In the lithium ion battery cell structure according to the present invention, the second empty foil region 21 is located at one end of the second coated region 22 in the length direction X.
In the cell structure of the lithium ion battery according to the present invention, the first tab 5 is an aluminum tab, and the second tab 6 is an aluminum-nickel tab, but the present invention is not limited thereto, and tabs made of other materials may also be adopted according to actual production requirements.
In the cell structure of the lithium ion battery according to the utility model, the first pole piece 1 and the second pole piece 2 are both provided with a long membrane surface and a short membrane surface. Specifically, the cathode coating long film surface can be continuously coated, namely the cathode long film surface is continuously coated, the head and tail coating elimination of the single-side and double-side coating is controlled to be more than 0 by the processes of short film surface gap coating and synchronous anode coating, the CB value is ensured, the lithium precipitation of the long cycle of the battery cell is prevented, then the cathode pole piece is cut off by adopting a double cutter, the empty aluminum foil-free state is realized, and the tail is closed by green glue.
The working principle of the utility model is as follows:
optimize the structure of ending of naked electric core 4, establish green glue 7 at the afterbody of first pole piece 1, carry out the ending through green glue 7, cancel empty aluminium foil ending, guarantee naked electric core afterbody Overhang, avoid the empty aluminium foil of negative pole long membrane face and the condition of positive pole direct contact, help improving the battery safety, in addition, this kind of structure is applicable in various number of piles electric core, only need increase negative pole piece double knives and waste recovery equipment on full-automatic winder, but automated production, and accessible adjustment double knives distance, realize regulation and control afterbody Overhang's function, in addition, the long membrane face of negative pole still can realize the single face and scribble even, help improving coating equipment and personnel's utilization ratio.
Second embodiment
The difference from the first embodiment is that: the first coated region 12 of the present embodiment forms the first tab 5 at both ends in the width direction Y, the second coated region 22 forms the second tab 6 at both ends in the width direction Y, the third empty foil region 13 has a width equal to that of the first coated region 12, and the fourth empty foil region 23 has a width equal to that of the second coated region 22. The width of the third empty foil area 13 and the width of the fourth empty foil area 23 are increased to form the first tab 5 at both ends of the first coating area 12 in the width direction Y, or to form the second tab 6 at both ends of the second coating area 22 in the width direction Y, so that the electrical property of the cell is improved by forming a multi-tab structure, which is helpful for improving low-temperature discharge, charge rate and temperature rise of the cell.
Other structures are the same as those of the first embodiment, and are not described herein again.
Third embodiment
The difference from the first embodiment is that: first empty foil district 11 and first coating district 12 of this embodiment are provided with first utmost point ear 5, and first empty foil district 11 and first coating district 12 form first utmost point ear 5 in the ascending one end of width direction Y, in this embodiment, also set up first utmost point ear 5 through in first empty foil district 11, help increasing the quantity of first utmost point ear 5, through forming many utmost point ear structures, improve electric core electrical property, help improving low temperature discharge, charge rate and electric core temperature rise.
The number of the cathode lugs is not less than 1 (the number of anode layers is plus 1), the number of the anode lugs is not less than 1 (the number of anode layers is plus 1), and other structures designed by the hollow aluminum foil ending of the multi-lug structure in the lugs are the same as those of the embodiment, and are not repeated herein.
Variations and modifications to the above-described embodiments may also occur to those skilled in the art, which fall within the scope of the utility model as disclosed and taught herein. Therefore, the present invention is not limited to the above-mentioned embodiments, and any obvious improvement, replacement or modification made by those skilled in the art based on the present invention is within the protection scope of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (10)
1. A lithium ion battery cell structure comprises a first pole piece (1), a diaphragm (3) and a second pole piece (2), wherein the first pole piece (1), the diaphragm (3) and the second pole piece (2) are sequentially superposed and wound to form a naked battery cell (4);
the first pole piece (1) comprises a first empty foil area (11) and a first coating area (12);
the second pole piece (2) comprises a second empty foil area (21) and a second coating area (22);
the battery is characterized in that the first empty foil area (11) and/or the first coating area (12) are/is provided with a first tab (5), the second coating area (22) is provided with a second tab (6), the tail of the first pole piece (1) is provided with green glue (7), and the green glue (7) is located on the outer peripheral surface of the naked battery cell (4) and wraps the naked battery cell (4).
2. The lithium ion battery cell structure of claim 1, wherein: the green glue (7) is adhered to the first empty foil area (11).
3. The lithium ion battery cell structure of claim 1, wherein: at least one end of the first empty foil area (11) or the first coating area (12) in the width direction (Y) is welded with a first tab (5).
4. The lithium ion battery cell structure of claim 1, wherein: the second coating region (22) welds the second tab (6) at least one end in the width direction (Y).
5. The lithium ion battery cell structure of claim 1, wherein: the first coating area (12) and the second coating area (22) are respectively provided with a third empty foil area (13) and a fourth empty foil area (23), the first tab (5) is welded in the third empty foil area (13), and the second tab (6) is welded in the fourth empty foil area (23).
6. The lithium ion battery cell structure of claim 5, wherein: in the width direction (Y), the width of the third empty foil region (13) is smaller than or equal to the width of the first coating region (12), and the width of the fourth empty foil region (23) is smaller than or equal to the width of the second coating region (22).
7. The lithium ion battery cell structure of claim 1, wherein: the first empty foil area (11) is located at one end of the first coating area (12) in the length direction (X), and the green glue (7) is connected to the first empty foil area (11).
8. The lithium ion battery cell structure of claim 1, wherein: the second empty foil area (21) is located at one end of the second coating area (22) in the length direction (X).
9. The lithium ion battery cell structure of claim 1, wherein: the first electrode lug (5) is an aluminum electrode lug, and the second electrode lug (6) is an aluminum-nickel electrode lug.
10. The lithium ion battery cell structure of claim 1, wherein: the first pole piece (1) and the second pole piece (2) are both provided with a long membrane surface and a short membrane surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122737960.4U CN216648360U (en) | 2021-11-10 | 2021-11-10 | Lithium ion battery cell structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122737960.4U CN216648360U (en) | 2021-11-10 | 2021-11-10 | Lithium ion battery cell structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216648360U true CN216648360U (en) | 2022-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122737960.4U Active CN216648360U (en) | 2021-11-10 | 2021-11-10 | Lithium ion battery cell structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216648360U (en) |
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2021
- 2021-11-10 CN CN202122737960.4U patent/CN216648360U/en active Active
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