CN220474663U - Bare cell structure and lithium battery - Google Patents
Bare cell structure and lithium battery Download PDFInfo
- Publication number
- CN220474663U CN220474663U CN202322126729.0U CN202322126729U CN220474663U CN 220474663 U CN220474663 U CN 220474663U CN 202322126729 U CN202322126729 U CN 202322126729U CN 220474663 U CN220474663 U CN 220474663U
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- Prior art keywords
- pole piece
- cell structure
- bare cell
- bending
- parts
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 19
- 238000005452 bending Methods 0.000 claims abstract description 62
- 239000011888 foil Substances 0.000 claims description 15
- 239000002002 slurry Substances 0.000 claims description 12
- 230000037431 insertion Effects 0.000 claims 1
- 238000003780 insertion Methods 0.000 claims 1
- 238000002360 preparation method Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910001416 lithium ion Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 208000010392 Bone Fractures Diseases 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 206010017076 Fracture Diseases 0.000 description 1
- 102100023170 Nuclear receptor subfamily 1 group D member 1 Human genes 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000006255 coating slurry Substances 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model provides a bare cell structure and a lithium battery, comprising a first pole piece and a second pole piece, wherein the second pole piece is spliced with the first pole piece, and the first pole piece is S-shaped and is provided with a plurality of parallel parts and a plurality of first bending parts; the second pole piece is C-shaped and is provided with two inserting parts and a second bending part; the plug-in part is plugged between two adjacent parallel parts, and the plug-in part is insulated from the parallel parts; the second bending part is a tab of the second pole piece. According to the structure, the second bending part of the second pole piece is used as the pole lug, and the second bending part is connected with the two plug-in parts, so that even if the second bending part is connected with one plug-in part and is broken, the second bending part is still connected with the other plug-in part, and therefore the battery has a normal current conducting function, can be charged and discharged normally, and does not influence the normal use of the battery.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a bare cell structure and a lithium battery.
Background
The lithium battery is a component part of the power battery, is mainly used in new energy electric automobile energy supply and energy storage battery clusters, and is provided with an internal bare cell, a stacked cell structure and a winding structure are commonly adopted, so that the electrical property of the lithium battery is stable, and the bare cell structure is also improved continuously.
The utility model patent with the prior authority of publication number CN214542314U discloses a lithium ion battery core, a lithium battery and an automobile, wherein a pole group in the lithium ion battery core comprises a plurality of structural units, the structural units comprise first pole pieces, second pole pieces and diaphragms, the diaphragms are coated on two sides of the first pole pieces, the first pole pieces are stacked in an S shape to form a plurality of laminated layers, and are connected with each laminated layer in series in a bent connection mode, the second pole pieces are respectively clamped between each adjacent laminated layer, second pole pieces are respectively clamped at the same ends of the second pole pieces, first pole pieces are respectively arranged at the same ends of the laminated layer, one of the first pole pieces and the second pole pieces is a positive pole piece, and the other of the first pole pieces and the second pole pieces is a negative pole piece.
According to the technical scheme, the second pole piece is clamped between the sheet layer parts of the first pole piece, the second pole lug is led out at one end of the second pole piece, and the second pole lug is connected with one second pole piece only, so that after the pole lug is welded, when the pole lug is welded, the outer layer pole lug is welded and printed with the edge to be broken easily in the process of folding the pole lug, rubberizing, pole lug laser welding and the like in the preparation engineering, the battery is low in capacity, and if the negative pole lug is broken, the risk of thermal runaway is also increased remarkably.
Disclosure of Invention
In view of the above, the utility model provides a bare cell structure with stable tab structure and high application safety and a lithium battery, so as to solve the problems of low battery capacity and high thermal runaway risk caused by easy tab breakage of the existing lithium battery.
The technical scheme of the utility model is realized as follows:
in one aspect, the utility model provides a bare cell structure, comprising a first pole piece and a second pole piece, wherein the second pole piece is spliced with the first pole piece,
the first pole piece is S-shaped and is provided with a plurality of parallel parts and a plurality of first bending parts;
the second pole piece is C-shaped and is provided with two inserting parts and a second bending part;
the plug-in part is plugged between two adjacent parallel parts, and the plug-in part is insulated from the parallel parts;
the second bending part is a tab of the second pole piece.
On the basis of the technical scheme, preferably, the first bending part is a tab of the first pole piece.
On the basis of the technical scheme, preferably, a plurality of second pole pieces are arranged, and the second bending parts of the plurality of second pole pieces are positioned on the same side of the first pole piece.
On the basis of the technical scheme, preferably, the parallel part of the first pole piece is of a rectangular structure.
On the basis of the above technical solution, preferably, the inserting portion and the second bending portion have the same width.
On the basis of the technical scheme, preferably, a plurality of second pole pieces are arranged, and the second bending parts of the plurality of second pole pieces are welded and fixed.
On the basis of the above technical solution, preferably, the second pole piece comprises a foil and a slurry, wherein,
the slurry is coated on the foil at intervals;
the second bending part is a region of the foil material which is not coated with the slurry.
On the basis of the above technical solution, preferably, a pre-creasing is provided at a middle position of the first bending portion and the second bending portion.
On the basis of the technical scheme, the device preferably further comprises a diaphragm, wherein the diaphragm is arranged between the plug-in part and the parallel part and is used for insulating the plug-in part and the parallel part.
On the other hand, the utility model provides a lithium battery, which comprises the bare cell structure.
Compared with the prior art, the bare cell structure and the lithium battery have the following beneficial effects:
(1) The second bending part of the second pole piece is used as the pole lug, and the second bending part is connected with the two plug-in parts, so that even if the connection between the second bending part and one plug-in part is broken, the second bending part is still connected with the other plug-in part, the second bending part still has a normal current conducting function, can perform normal charge and discharge, does not influence the normal use of the battery, and can reduce the risk of thermal runaway;
(2) The second pole piece comprises a foil and slurry, and in the preparation process, an empty area is reserved on the foil and used as a second bending part, and the second pole piece is used as a pole lug and has the advantage of convenience in preparation.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a perspective view of a bare cell structure and a lithium battery of the present utility model;
FIG. 2 is a block diagram of the point A of FIG. 1 in accordance with the present utility model;
FIG. 3 is an exploded view of a bare cell structure and a lithium battery of the present utility model;
FIG. 4 is an expanded structure diagram of a bare cell structure and a first pole piece of a lithium battery of the present utility model;
FIG. 5 is an expanded structure diagram of a bare cell structure and a second pole piece of a lithium battery of the present utility model;
FIG. 6 is a block diagram showing the constitution of a bare cell structure and a second electrode sheet of a lithium battery according to the present utility model;
fig. 7 is a perspective view of a second die structure;
FIG. 8 is an exploded view of a second bare cell structure;
fig. 9 is a perspective view of a third bare cell structure;
fig. 10 is an exploded view of a third bare cell structure;
in the figure: 1. a first pole piece; 11. a parallel portion; 12. a first bending part; 2. a second pole piece; 21. a plug-in part; 22. a second bending part; 201. foil material; 202. a slurry; 3. a diaphragm; 00. pre-creasing.
Detailed Description
The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.
As shown in fig. 1 to 10, the bare cell structure of the utility model comprises a first pole piece 1, a parallel part 11, a first bending part 12, a second pole piece 2, a plug-in part 21, a second bending part 22, a foil 201, slurry 202 and a diaphragm 3;
the lithium battery comprises the bare cell structure.
A first pole piece 1 and a second pole piece 2, one for the positive pole piece and the other for the negative pole piece.
As shown in fig. 1 to 3, the second pole piece 2 is spliced with the first pole piece 1, wherein the first pole piece 1 is S-shaped and has a plurality of parallel parts 11 and a plurality of first bending parts 12; the second pole piece 2 is C-shaped and is provided with two inserting parts 21 and a second bending part 22; the plug-in part 21 is plugged between two adjacent parallel parts 11, and the plug-in part 21 is insulated from the parallel parts 11; the second bending part 22 is a tab of the second pole piece 2;
in the above structure, after the first pole piece 1 is bent into the S shape, a plurality of parallel portions 11 and a first bending portion 12 are generated, and after the second pole piece 2 is bent into the C shape, two plugging portions 21 and one second bending portion 22 are provided, when assembling, the plugging portion 21 of the second pole piece 2 is inserted between the two parallel portions 11 to connect the first pole piece 1 with the second pole piece 2, the second bending portion 22 is used as a tab of the second pole piece 2, so that a single tab is connected with the two plugging portions 21, and even if the second bending portion 22 is broken with one of the plugging portions 21 in the production process, the battery is still connected with the other plugging portion 21, so that the battery has the advantage of no electrical property failure and stable electrical property, and the thermal runaway risk of the battery can be reduced.
Specifically, the plug portion 21 and the parallel portion 11 are insulated from each other by the diaphragm 3, and the diaphragm 3 is provided between the plug portion 21 and the parallel portion 11.
Further, the first bending part 12 is a tab of the first pole piece 1; the arrangement of the structure is the same as that of the second pole piece 2, so that the structure stability of the first pole piece 1 can be ensured, and the pole lugs are not easy to break and fail.
Further, a plurality of second pole pieces 2 are arranged, and the second bending parts 22 of the plurality of second pole pieces 2 are positioned on the same side of the first pole piece 1;
in the above arrangement, the plurality of second bending parts 22 are arranged on the same side, that is, after the second bending parts 22 of the plurality of second pole pieces 2 are led out, the second bending parts extend out from one side of the first pole piece 1, which is beneficial to reducing the volume of the single battery, thereby improving the energy density of the single battery.
The above-described structure, which is particularly suitable for use in a blade battery, can be provided with the parallel portion 11 of the first pole piece 1 in a rectangular structure at the time of preparation,
preferably, the widths of the plugging portion 21 and the second bending portion 22 are the same, which can ensure the connection structure strength of the plugging portion 21 and the second bending portion 22 to reduce the fracture risk.
As shown in fig. 6, the second pole piece 2 comprises a foil 201 and a slurry 202, wherein the slurry 202 is coated on the foil 201 at intervals; the second bending part 22 is the area of the foil 201 which is not coated with the slurry;
in the above-mentioned structure, when preparing the second pole piece 2, the coating slurry 202 is spaced on the foil 201, so as to form the plugging portion 21 and the second bending portion 22, which has the advantage of convenient preparation, and meanwhile, the first pole piece 1 can also be prepared in this way.
Specifically, the second pole pieces 2 are provided in plural numbers, and after the plugging portions 21 of the plurality of second pole pieces 2 are plugged with the first pole pieces 1, the second bending portions 22 of the plurality of second pole pieces 2 are welded and fixed.
As shown in fig. 4 and 5, a pre-crease 00 is provided in the middle of the first bending part 12 and the second bending part 22;
in the above structure, the pre-crease 00 is arranged on the first bending part 12 and the second bending part 22 in a stamping mode, so that the first pole piece 1 and the second pole piece 2 can be conveniently bent, and the problem that the parallel parts 11 and the inserting parts 21 are not corresponding to each other after bending is avoided.
As shown in fig. 7 and 8, the present solution provides a second bare cell structure, where the first pole piece 1 and the second pole piece 2 are both in a C-shaped structure, and in the preparation process, the first pole piece 1 and the second pole piece 2 are inserted and stacked with each other, and the structure has the advantage of convenience in stacking, and the direction of leading out the bent parts of the first pole ear 1 and the second pole piece 2 is not limited, so that the first bare cell structure can be led out in multiple directions, and also can be led out in a single direction.
Generally, the chemical system design is adopted, the battery capacity (length of a pole piece) is increased, the equivalent resistance of a substance is reduced, but the length of the pole piece is large to a certain extent, the equivalent resistance of the substance tends to a limit value not to be reduced, so that the internal polarization of the battery is increased, and the problems of low charge and discharge efficiency, high temperature, short service life and the like are caused.
As shown in fig. 9 and 10, the present solution provides a third bare cell structure to solve the above problem, where the first pole piece 1 and the second pole piece 2 are both in an S-shaped structure, and are stacked alternately, which can reduce the electron transmission path, greatly reduce the dc internal resistance, and avoid the problem that the tab breakage affects the electrical performance in the preparation process.
The specific implementation steps are as follows:
the paste 202 is coated on the foil 201 at intervals, the plug-in part 21 and the second bending part 22 are prepared, the first pole piece 1 is manufactured in the same way, the pre-crease 00 is punched on the first pole piece 1 and the second pole piece 2 respectively, then the first pole piece 1 and the second pole piece 2 are bent, the plug-in part 21 of the second pole piece 2 is plugged between the parallel parts 11 of the first pole piece 1, finally the first bending parts 12 are welded and fixed, and the second bending parts 22 are welded and fixed.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (10)
1. A bare cell structure is characterized in that: comprises a first pole piece (1) and a second pole piece (2), wherein the second pole piece (2) is spliced with the first pole piece (1),
the first pole piece (1) is S-shaped and is provided with a plurality of parallel parts (11) and a plurality of first bending parts (12);
the second pole piece (2) is C-shaped and is provided with two inserting parts (21) and a second bending part (22);
the plug-in part (21) is plugged between two adjacent parallel parts (11), and the plug-in part (21) is insulated from the parallel parts (11);
the second bending part (22) is a tab of the second pole piece (2).
2. The bare cell structure of claim 1 wherein: the first bending part (12) is a lug of the first pole piece (1).
3. The bare cell structure of claim 1 wherein: the second pole piece (2) is provided with a plurality of second bending parts (22) of the second pole pieces (2) are positioned on the same side of the first pole piece (1).
4. The bare cell structure of claim 1 wherein: the parallel part (11) of the first pole piece (1) is of a rectangular structure.
5. The bare cell structure of claim 4 wherein: the insertion part (21) and the second bending part (22) have the same width.
6. The bare cell structure of claim 1 wherein: the second pole piece (2) is provided with a plurality of second bending parts (22) of the second pole piece (2) which are welded and fixed.
7. The bare cell structure of claim 1 wherein: the second pole piece (2) comprises a foil (201) and a slurry (202), wherein,
-the slurry (202) is applied on the foil (201) at intervals;
the second bending part (22) is a region of the foil (201) which is not coated with slurry.
8. The bare cell structure of claim 1 wherein: the middle positions of the first bending part (12) and the second bending part (22) are provided with pre-folds (00).
9. The bare cell structure of claim 1 wherein: the device further comprises a diaphragm (3), wherein the diaphragm (3) is arranged between the plug-in part (21) and the parallel part (11) and is used for insulating the plug-in part (21) and the parallel part (11).
10. A lithium battery, characterized in that: a bare cell structure comprising the device of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322126729.0U CN220474663U (en) | 2023-08-09 | 2023-08-09 | Bare cell structure and lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322126729.0U CN220474663U (en) | 2023-08-09 | 2023-08-09 | Bare cell structure and lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220474663U true CN220474663U (en) | 2024-02-09 |
Family
ID=89780105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322126729.0U Active CN220474663U (en) | 2023-08-09 | 2023-08-09 | Bare cell structure and lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220474663U (en) |
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2023
- 2023-08-09 CN CN202322126729.0U patent/CN220474663U/en active Active
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