CN217306683U - Double-layer diaphragm structure and cylindrical battery cell - Google Patents
Double-layer diaphragm structure and cylindrical battery cell Download PDFInfo
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- CN217306683U CN217306683U CN202220763338.2U CN202220763338U CN217306683U CN 217306683 U CN217306683 U CN 217306683U CN 202220763338 U CN202220763338 U CN 202220763338U CN 217306683 U CN217306683 U CN 217306683U
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Abstract
The utility model relates to a battery technology field especially relates to a double-deck diaphragm structure and cylinder electricity core. The double-layer diaphragm structure comprises a main isolation diaphragm and an auxiliary isolation diaphragm, wherein the length of the auxiliary isolation diaphragm is smaller than that of the main isolation diaphragm; the number of the auxiliary isolating diaphragms is two, one of the auxiliary isolating diaphragms is arranged at one end of the first surface of the main isolating diaphragm, and the other auxiliary isolating diaphragm is arranged at the other end of the second surface of the main isolating diaphragm; the first surface and the second surface are the two oppositely disposed largest surfaces of the main isolation diaphragm. This double-deck diaphragm structure on the one hand can effectively fill the district of thinning of pole piece through assisting the isolation diaphragm, prevents that the pole piece from rubbing flat in-process produced metal particle and getting into inside the electric core. On the other hand, through set up one respectively and assist the barrier film on two biggest surfaces at main barrier film, can be convenient for the imbibition speed of the inside electrolyte of electric core. The cylindrical battery cell improves the energy density of the cylindrical battery cell and improves the practicability of the battery cell by applying the double-layer diaphragm structure.
Description
Technical Field
The utility model relates to a battery technology field especially relates to a double-deck diaphragm structure and cylinder electricity core.
Background
At present, the preparation process of the cylindrical battery cell is simple and becomes a new research and development focus of the new energy battery. The existing large cylindrical battery cell adopts a full-lug structure, lugs are kneaded into a plane through a kneading and flattening roller (as in patent 202110557853.5), and the plane is connected with a top cover and a shell through kneading. This kind of cylinder structure has promoted the production efficiency of electric core greatly, has reduced the internal resistance of electric core, has promoted the multiplying power performance of electric core. Meanwhile, some patents (201911130139.7) propose to improve the cell infiltration by compounding a double-layer diaphragm, and have obvious effect on improving the cell infiltration.
The existing kneading and flattening technology realizes kneading and compacting into a plane through kneading and flattening rollers and rotating full lugs of the battery cell at a high speed. During the flattening process, the tab may be broken to produce a large amount of metal scrap particles. The falling of metal debris particles into the interior of the cell can lead to serious self-discharge problems. Meanwhile, the kneading structure can lead to the difficulty of soaking the electrolyte of the battery cell, and the existing double-layer diaphragm structure can improve the soaking problem of the battery cell, but increases the thickness of the internal diaphragm, can lead to the great reduction of the energy density of the battery cell, and reduces the practicability of the battery cell.
Therefore, a double-layered separator structure is needed to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a double-deck diaphragm structure to solve the problem that double-deck diaphragm exists among the prior art.
Another object of the utility model is to provide a cylinder electricity core, through using above-mentioned double-deck diaphragm structure, improve cylinder electricity core energy density, improve electric core practicality.
In order to realize the purpose, the following technical scheme is provided:
in a first aspect, there is provided a double-layer membrane structure comprising:
a main isolation diaphragm;
an auxiliary isolation diaphragm, the length of the auxiliary isolation diaphragm being less than the length of the main isolation diaphragm; the number of the auxiliary isolating diaphragms is two, one of the auxiliary isolating diaphragms is arranged at one end of the first surface of the main isolating diaphragm, and the other auxiliary isolating diaphragm is arranged at the other end of the second surface of the main isolating diaphragm; the first surface and the second surface are two oppositely disposed largest surfaces of the main isolation diaphragm.
As an alternative to the double-layer diaphragm structure, the length of the auxiliary isolation diaphragm is greater than the thinning region of the pole piece of the cylindrical electrical core.
As an alternative to the double-layered diaphragm structure, one end of the main isolation diaphragm and one end of one of the auxiliary isolation diaphragms are flush, and the other end of the main isolation diaphragm and one end of the other auxiliary isolation diaphragm are flush.
As an alternative of the double-layer diaphragm structure, a polyvinylidene fluoride coating is coated on the main isolation diaphragm; or the main isolating diaphragm is coated with a ceramic coating.
As an alternative of the double-layer diaphragm structure, a polyvinylidene fluoride coating is coated on the auxiliary isolating diaphragm; or the auxiliary isolating diaphragm is coated with a ceramic coating.
As an alternative to the double-layered diaphragm structure, the main isolation diaphragm and the auxiliary isolation diaphragm are compounded by a heating roller.
In a second aspect, a cylindrical cell is provided, comprising:
a housing;
the positive plate and the negative plate are arranged in the shell;
according to the double-layer diaphragm structure, the double-layer diaphragm structure is arranged between the positive plate and the negative plate.
As an alternative of the cylindrical battery cell, the positive plate comprises a positive main body, a positive thinning area and a positive tab which are sequentially arranged, one side surface of the positive thinning area corresponds to an auxiliary isolation diaphragm of a double-layer diaphragm structure, and the other side surface of the positive thinning area corresponds to an auxiliary isolation diaphragm of another double-layer diaphragm structure.
As an alternative of the cylindrical battery cell, the negative plate includes a negative main body, a negative thinning region and a negative tab, which are sequentially disposed, one side of the negative thinning region corresponds to an auxiliary isolation diaphragm of a double-layer diaphragm structure, and the other side of the negative thinning region corresponds to an auxiliary isolation diaphragm of another double-layer diaphragm structure.
As an alternative to the cylindrical cell, the length of the auxiliary isolation diaphragm is less than the sum of the lengths of the positive electrode thinning area and the positive electrode tab.
As an alternative to the cylindrical cell, the length of the auxiliary isolation diaphragm is less than the sum of the lengths of the negative electrode thinning area and the negative electrode tab.
As an alternative to the cylindrical cell, the positive electrode tab extends beyond one end of the double-layer separator structure.
As an alternative to the cylindrical cell, the negative electrode tab extends beyond the other end of the double-layer separator structure.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a double-layer diaphragm structure, which comprises a main isolation diaphragm and an auxiliary isolation diaphragm, wherein the length of the auxiliary isolation diaphragm is less than that of the main isolation diaphragm; the number of the auxiliary isolating diaphragms is two, one of the auxiliary isolating diaphragms is arranged at one end of the first surface of the main isolating diaphragm, and the other auxiliary isolating diaphragm is arranged at the other end of the second surface of the main isolating diaphragm; the first surface and the second surface are the two oppositely disposed largest surfaces of the main isolation diaphragm. This double-deck diaphragm structure on the one hand can effectively fill the district of thinning of pole piece through assisting the isolation diaphragm, prevents that the pole piece from rubbing flat in-process produced metal particle and getting into inside the electric core. On the other hand, through set up one respectively and assist the barrier film on two biggest surfaces at main barrier film, can be convenient for the imbibition speed of the inside electrolyte of electric core.
The utility model provides a cylinder electricity core through using above-mentioned double-deck diaphragm structure, improves cylinder electricity core energy density, improves electric core practicality.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a double-layer diaphragm structure provided in an embodiment of the present invention;
fig. 2 is a perspective view of a cylindrical battery cell provided in an embodiment of the present invention;
fig. 3 is a cross-sectional view of the cylindrical battery cell provided by the embodiment of the present invention.
Reference numerals:
100-cylindrical cells;
10-double layer membrane structure; 11-a main isolation diaphragm; 12-an auxiliary isolation diaphragm;
20-positive plate; 21-a positive electrode body; 22-a positive pole thinning region; 23-a positive electrode tab;
30-negative pole piece; 31-a negative body; 32-a negative pole thinning region; 33-negative pole tab.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships that the products of the present invention are usually placed when used, and are only for the convenience of describing the present invention and simplifying the description, but not for indicating or implying that the indicated device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected; either mechanically or electrically. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present embodiment provides a double-layer diaphragm structure 10, which includes a main isolation diaphragm 11 and an auxiliary isolation diaphragm 12, wherein the length of the auxiliary isolation diaphragm 12 is smaller than that of the main isolation diaphragm 11; the number of the auxiliary isolation diaphragms 12 is two, one of the auxiliary isolation diaphragms is arranged at one end of the first surface of the main isolation diaphragm 11, and the other auxiliary isolation diaphragm is arranged at the other end of the second surface of the main isolation diaphragm 11; the first and second surfaces are the two oppositely disposed largest surfaces of the main isolation diaphragm 11. On one hand, the double-layer diaphragm structure 10 can effectively fill a thinning area of the pole piece through the auxiliary isolation diaphragm 12, and prevent metal particles generated in the pole piece flattening process from entering the battery core. On the other hand, by providing an auxiliary isolation diaphragm 12 on each of the two largest surfaces of the main isolation diaphragm 11, the liquid suction rate of the electrolyte inside the battery cell can be facilitated.
Optionally, the main isolation diaphragm 11 and the auxiliary isolation diaphragm 12 are combined through a heating roller, so that the two are ensured to be integrated.
Preferably, the length of the auxiliary isolation diaphragm 12 is greater than the thinning region of the pole piece of the cylindrical battery cell 100, so as to ensure that the auxiliary isolation diaphragm 12 can completely cover the thinning region of the pole piece.
As shown in fig. 2 to fig. 3, the present embodiment further provides a cylindrical battery cell 100, which includes a casing (not shown in the drawings), a positive electrode sheet 20, a negative electrode sheet 30, and the above-mentioned double-layer diaphragm structure 10, wherein the double-layer diaphragm structure 10 is disposed between the positive electrode sheet 20 and the negative electrode sheet 30.
Illustratively, the double-layered separator structure 10, the negative electrode sheet 30, the double-layered separator structure 10, and the positive electrode sheet 20 are stacked and then wound to form an electrode assembly.
Preferably, the positive electrode plate 20 includes a positive electrode main body 21, a positive electrode thinning region 22 and a positive electrode tab 23, which are sequentially disposed, one side surface of the positive electrode thinning region 22 corresponds to the auxiliary isolating diaphragm 12 of one double-layered diaphragm structure 10, and the other side surface of the positive electrode thinning region 22 corresponds to the auxiliary isolating diaphragm 12 of another double-layered diaphragm structure 10, so as to ensure that the auxiliary isolating diaphragm 12 can supplement both sides of the positive electrode thinning region 22, and prevent metal particles from entering the inside of the electrode assembly.
Preferably, the negative electrode sheet 30 includes a negative electrode main body 31, a negative electrode thinning region 32 and a negative electrode tab 33, which are sequentially disposed, one side surface of the negative electrode thinning region 32 corresponds to the auxiliary isolating diaphragm 12 of one double-layered diaphragm structure 10, and the other side surface of the negative electrode thinning region 32 corresponds to the auxiliary isolating diaphragm 12 of another double-layered diaphragm structure 10, so as to ensure that the auxiliary isolating diaphragm 12 can supplement both sides of the negative electrode thinning region 32, thereby preventing metal particles from entering the inside of the electrode assembly.
The main isolation diaphragm 11 in the double-layer diaphragm structure 10 is used for insulating and isolating the positive plate 20 and the negative plate 30, and the auxiliary isolation diaphragm 12 can fill the gap caused by the positive electrode thinning area 22 and the negative electrode thinning area 32 and prevent metal debris generated in the flattening process from entering the inside of the electrode assembly from the gap. In addition, the double-layer diaphragm structure 100 can also increase the wettability of the battery cell, and the double-layer diaphragm structure 10 in the thinning area is equivalent to a liquid suction head, so that the liquid suction capacity of the electrolyte in the flattening area can be improved. Because the double-layer diaphragm structure 10 fills the gap in the pole piece thinning area, the usage amount of the active material is not influenced, and the capacity of the battery cell is not influenced.
Preferably, the length of the auxiliary isolating diaphragm 12 is less than the sum of the lengths of the positive thinned region 22 and the positive tab 23. The design reduces the length of the auxiliary isolation diaphragm 12 as much as possible, on one hand, the material can be saved, on the other hand, the overall size of the winding electrode assembly can be reduced, and the energy density of the battery cell is improved.
Preferably, the length of the auxiliary isolating diaphragm 12 is less than the sum of the lengths of the negative electrode thinned region 32 and the negative electrode tab 33. The design reduces the length of the auxiliary isolation diaphragm 12 as much as possible, on one hand, the material can be saved, on the other hand, the overall size of the winding electrode assembly can be reduced, and the energy density of the battery cell is improved.
Preferably, the positive electrode tab 23 extends beyond one end of the double-layer membrane structure 10, so that the positive electrode tab 23 can be flattened later.
Preferably, the negative electrode tab 33 protrudes beyond the other end of the double-layered separator structure 10, so that the negative electrode tab 33 can be flattened later.
Optionally, a polyvinylidene fluoride coating is applied to the main isolation diaphragm 11. In other embodiments, the primary isolation diaphragm 11 is coated with a ceramic coating. The coating layer is only required to be able to perform the insulation and isolation between the positive electrode sheet 20 and the negative electrode sheet 30, and is not illustrated.
Similarly, the auxiliary isolation diaphragm 12 can be coated with a polyvinylidene fluoride coating; or the secondary isolation diaphragm 12 is coated with a ceramic coating.
In the cylindrical battery cell 100 with the double-layer diaphragm structure 10 provided by this embodiment, due to the existence of the composite region of the double-layer diaphragm structure 10, the gaps of the negative electrode thinning region 32 and the positive electrode thinning region 22 can be effectively filled, and the metal fragments generated when the negative electrode tab 33 and the positive electrode tab 23 are flattened are prevented from falling. Meanwhile, due to the existence of the composite area of the double-layer diaphragm structure 10, the liquid absorption channel can be used as a quick liquid absorption channel, and the liquid absorption rate of the battery cell is improved. And the composite area of the double-layer diaphragm structure 10 just fills the thinning areas of the positive and negative pole pieces, so that the use amount of active materials of the battery cell is not influenced, the capacity of the battery cell is not reduced, and the energy density and the wettability are considered while the metal debris protection of the battery cell is realized.
It should be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles applied thereto. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious modifications, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A double-layer membrane structure, comprising:
a main isolation diaphragm (11);
an auxiliary isolation diaphragm (12), the length of the auxiliary isolation diaphragm (12) being less than the length of the main isolation diaphragm (11); the number of the auxiliary isolating diaphragms (12) is two, one of the auxiliary isolating diaphragms is arranged at one end of the first surface of the main isolating diaphragm (11), and the other auxiliary isolating diaphragm is arranged at the other end of the second surface of the main isolating diaphragm (11); the first and second surfaces are the two oppositely disposed largest surfaces of the primary isolation diaphragm (11).
2. The double-layer separator structure according to claim 1, wherein the length of the secondary isolating diaphragm (12) is greater than the skived area of the pole piece of the cylindrical cell.
3. The double-layered diaphragm structure according to claim 2, wherein one end of the main isolation diaphragm (11) and one end of one auxiliary isolation diaphragm (12) are flush, and the other end of the main isolation diaphragm (11) and one end of the other auxiliary isolation diaphragm (12) are flush.
4. The double-layer membrane structure according to claim 2, wherein said main separation membrane (11) is coated with a polyvinylidene fluoride coating; or a ceramic coating is coated on the main isolation diaphragm (11).
5. The double-layer membrane structure according to claim 2, wherein the secondary isolation diaphragm (12) is coated with a polyvinylidene fluoride coating; or the auxiliary isolating diaphragm (12) is coated with a ceramic coating.
6. The double-layered diaphragm structure according to claim 2, wherein the main isolation diaphragm (11) and the auxiliary isolation diaphragm (12) are compounded by a heated roller.
7. A cylindrical cell, comprising:
a housing;
a positive plate (20) and a negative plate (30) disposed in the case;
the double-layered separator structure (10) according to any one of claims 1 to 6, said double-layered separator structure (10) being disposed between said positive electrode sheet (20) and said negative electrode sheet (30).
8. The cylindrical battery cell according to claim 7, wherein the positive electrode sheet (20) comprises a positive electrode main body (21), a positive electrode thinning region (22) and a positive electrode tab (23) which are sequentially arranged, one side surface of the positive electrode thinning region (22) corresponds to the auxiliary isolation diaphragm (12) of one double-layer diaphragm structure (10), and the other side surface of the positive electrode thinning region (22) corresponds to the auxiliary isolation diaphragm (12) of another double-layer diaphragm structure (10);
negative pole piece (30) are cut thin district (32) and negative pole utmost point ear (33) including negative pole main part (31), the negative pole that sets gradually, a side that district (32) were cut to the negative pole is corresponding with the supplementary isolation diaphragm (12) of a double-deck diaphragm structure (10), the negative pole is cut another side in thin district (32) and is corresponding with the supplementary isolation diaphragm (12) of another double-deck diaphragm structure (10).
9. The cylindrical cell of claim 8, wherein the length of the auxiliary isolating diaphragm (12) is less than the sum of the lengths of the positive thinning-out region (22) and the positive tab (23);
the length of the auxiliary isolation diaphragm (12) is less than the sum of the lengths of the negative electrode thinning area (32) and the negative electrode tab (33).
10. The cylindrical cell of claim 8, wherein the positive electrode tab (23) extends beyond one end of the double-layer separator structure (10);
the negative pole tab (33) exceeds the other end of the double-layer diaphragm structure (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220763338.2U CN217306683U (en) | 2022-04-02 | 2022-04-02 | Double-layer diaphragm structure and cylindrical battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220763338.2U CN217306683U (en) | 2022-04-02 | 2022-04-02 | Double-layer diaphragm structure and cylindrical battery cell |
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| CN217306683U true CN217306683U (en) | 2022-08-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220763338.2U Active CN217306683U (en) | 2022-04-02 | 2022-04-02 | Double-layer diaphragm structure and cylindrical battery cell |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024082270A1 (en) * | 2022-10-21 | 2024-04-25 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electrical device |
| WO2024094210A1 (en) * | 2022-11-04 | 2024-05-10 | 厦门新能达科技有限公司 | Columnar battery and electrical device comprising columnar battery |
-
2022
- 2022-04-02 CN CN202220763338.2U patent/CN217306683U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024082270A1 (en) * | 2022-10-21 | 2024-04-25 | 宁德时代新能源科技股份有限公司 | Battery cell, battery and electrical device |
| WO2024094210A1 (en) * | 2022-11-04 | 2024-05-10 | 厦门新能达科技有限公司 | Columnar battery and electrical device comprising columnar battery |
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