CN220526956U - Lamination unit, lamination cell, battery and electric equipment - Google Patents
Lamination unit, lamination cell, battery and electric equipment Download PDFInfo
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- CN220526956U CN220526956U CN202322000824.6U CN202322000824U CN220526956U CN 220526956 U CN220526956 U CN 220526956U CN 202322000824 U CN202322000824 U CN 202322000824U CN 220526956 U CN220526956 U CN 220526956U
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- negative electrode
- large end
- positive pole
- positive
- stacked
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- 238000003475 lamination Methods 0.000 title claims abstract description 50
- 239000011888 foil Substances 0.000 claims abstract description 43
- 239000007773 negative electrode material Substances 0.000 claims description 5
- 239000013543 active substance Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 239000000178 monomer Substances 0.000 description 5
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- FKNQFGJONOIPTF-UHFFFAOYSA-N Sodium cation Chemical compound [Na+] FKNQFGJONOIPTF-UHFFFAOYSA-N 0.000 description 1
- JDZCKJOXGCMJGS-UHFFFAOYSA-N [Li].[S] Chemical compound [Li].[S] JDZCKJOXGCMJGS-UHFFFAOYSA-N 0.000 description 1
- 239000000306 component Substances 0.000 description 1
- 239000008358 core component Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model relates to a lamination unit, a lamination cell, a battery and electric equipment. The lamination unit includes: the negative pole piece comprises a negative pole foil, wherein the negative pole foil comprises a first large end and a first small end which are opposite along the length direction of the negative pole foil, and the negative pole tab is arranged at the first large end; the positive pole piece comprises a positive pole foil, wherein the positive pole foil comprises a second large end and a second small end which are opposite along the length direction of the positive pole foil, and the positive pole lug is arranged at the second large end; the diaphragm is arranged between the negative pole piece and the positive pole piece; when the positive electrode plate is stacked on the negative electrode plate along the thickness direction, the second large end corresponds to the first small end, and the second small end corresponds to the first large end. Therefore, as the negative electrode tab is arranged at the first large end and the positive electrode tab is arranged at the second large end, the thicknesses of the first large end and the second large end are thicker, overcurrent requirements can be met, and dangerous situations such as heating, ignition and the like can not occur.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a lamination unit, a lamination cell, a battery and electric equipment.
Background
The lithium battery comprises a shell and a battery core accommodated in the shell, wherein the battery core is a core component of the lithium battery and can be formed by a pole piece in a lamination or winding mode. The battery cell formed in the lamination mode is a lamination battery cell, the thicknesses of all parts of the positive electrode plate and the negative electrode plate of the traditional lamination battery cell are uniform, the currents of one ends of the positive electrode plate and the negative electrode plate, which are far away from the positive electrode lug and the negative electrode lug, are smaller, the currents of one ends of the positive electrode lug and the negative electrode lug, which are close to the positive electrode lug and the negative electrode lug, are larger, the sizes of the positive electrode lug and the negative electrode lug are smaller than those of the positive electrode plate and the negative electrode plate, and the positions, which are close to the positive electrode lug and the negative electrode lug, are easy to overflow and heat to cause dangerous situations such as fire.
Disclosure of Invention
Based on this, it is necessary to provide a lamination unit, a lamination cell, a battery and electric equipment for improving the above-mentioned defects, aiming at the problem that the lamination cell is close to the position of the positive electrode lug and the negative electrode lug and is easy to cause dangerous situations such as fire due to overcurrent and heat.
A lamination unit comprising:
the negative electrode plate comprises a negative electrode foil, negative electrode active materials and negative electrode lugs, wherein the negative electrode active materials and the negative electrode lugs are coated on two opposite sides of the negative electrode foil in the thickness direction, the negative electrode foil comprises a first large end and a first small end which are opposite in the length direction, and the negative electrode lugs are arranged at the first large end;
the positive pole piece comprises a positive pole foil, positive pole active substances and positive pole lugs, wherein the positive pole active substances and the positive pole lugs are coated on two opposite sides of the positive pole foil in the thickness direction, the positive pole foil comprises a second large end and a second small end which are opposite in the length direction, and the positive pole lugs are arranged at the second large end; and
The diaphragm is arranged between the negative pole piece and the positive pole piece and is used for separating the negative pole piece from the positive pole piece;
when the positive electrode plate is stacked on the negative electrode plate along the thickness direction, the second large end corresponds to the first small end, and the second small end corresponds to the first large end.
In one embodiment, the thickness of the first large end is equal to the thickness of the second large end, and the thickness of the first small end is equal to the thickness of the second small end.
In one embodiment, the negative electrode foil comprises a first inclined surface and a first plane which are opposite to each other along the thickness direction of the negative electrode foil, wherein an included angle between the first inclined surface and a horizontal plane is a; the positive electrode foil comprises a second inclined plane and a second plane which are opposite to each other along the thickness direction of the positive electrode foil, wherein the included angle between the second inclined plane and the horizontal plane is b, and b is equal to a; when the positive electrode plate is stacked on the negative electrode plate, the second inclined plane is stacked on the first inclined plane through the diaphragm.
In one embodiment, the negative electrode foil comprises two opposite first inclined planes along the thickness direction of the negative electrode foil, the two first inclined planes are arranged in a mirror symmetry manner, and the included angle between each first inclined plane and the horizontal plane is a; the positive electrode foil comprises two opposite second inclined planes along the thickness direction of the positive electrode foil, the two second inclined planes are arranged in a mirror symmetry mode, and the included angle between each second inclined plane and the horizontal plane is b, wherein b is equal to a; when the positive electrode plate is stacked on the negative electrode plate, the second inclined plane is stacked on the first inclined plane through the diaphragm.
In one embodiment, a is 0.5 ° or more and 5 ° or less and b is 0.5 ° or more and 5 ° or less.
In one embodiment, the separator includes a first separator and a second separator, the negative electrode tab is stacked on the first separator, the second separator is stacked on the negative electrode tab, and the positive electrode tab is stacked on the second separator.
In one embodiment, the first separator and the second separator are the same separator, and may be stacked continuously between the negative electrode sheet and the positive electrode sheet in a Z-type stacking manner.
A laminated cell comprising a laminated unit as described in any of the embodiments above.
A battery comprising a laminated cell as in any one of the embodiments above.
A powered device comprising a laminated cell as described in any of the embodiments above or a battery as described in any of the embodiments above.
According to the lamination unit and the lamination battery cell, after the positive pole piece and the negative pole piece are stacked, the thicknesses of the two ends of the lamination unit along the length direction can be basically kept consistent. Because the current passing through the first small end of the negative electrode plate and the second small end of the positive electrode plate is smaller, the overcurrent requirement can be met even if the thicknesses of the first small end and the second small end are thinner. Because the negative electrode tab is arranged at the first large end, the positive electrode tab is arranged at the second large end, the thicknesses of the first large end and the second large end are thicker, overcurrent requirements can be met, and dangerous situations such as heating, ignition and the like can not occur.
Drawings
In order to more clearly illustrate the embodiments of the present application 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 below, it being obvious that the drawings in the following description are only some embodiments of the present application, 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 schematic view of a lamination unit according to an embodiment of the present utility model;
FIG. 2 is a schematic cross-sectional view of the lamination unit shown in FIG. 1;
FIG. 3 is a simplified schematic diagram of one embodiment of the lamination unit shown in FIG. 1;
fig. 4 is a simplified schematic diagram of another embodiment of the lamination unit shown in fig. 1.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present utility model, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
An embodiment of the present utility model provides an electrical device that uses a battery as its power source. The electric equipment can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, a battery car, an electric automobile, a ship, a spacecraft and the like.
In particular embodiments, a battery includes a housing and a battery cell including one or more cells. The battery cell is accommodated in the case. The box body is used for providing an accommodating space for the battery monomer, can adopt various structures, and can also be in various shapes, such as a cylinder, a cuboid and the like.
In the battery, a plurality of battery monomers can be connected in series or in parallel or in series-parallel connection, and the series-parallel connection means that the plurality of battery monomers are connected in series or in parallel. The plurality of battery monomers can be directly connected in series or in parallel or in series-parallel, and then the whole formed by the plurality of battery monomers is accommodated in the box body; of course, the battery can also be a battery module formed by connecting a plurality of battery cells in series or parallel or series-parallel connection, and then the plurality of battery modules are connected in series or parallel or series-parallel connection to form a whole and are accommodated in the box body. The battery may further include other structures, for example, a bus member for making electrical connection between the plurality of battery cells. Wherein each battery cell may be a secondary battery or a primary battery; but not limited to, lithium sulfur batteries, sodium ion batteries, or magnesium ion batteries.
In particular embodiments, the cell is a component of a battery cell that undergoes an electrochemical reaction, and may include a positive electrode tab, a negative electrode tab, and a separator. The battery cell can be a laminated structure formed by laminating an anode pole piece, a cathode pole piece and a diaphragm, namely the laminated battery cell.
Referring to fig. 1 and 2, an embodiment of the present utility model provides a lamination unit for preparing a laminated cell.
The lamination unit at least comprises a negative electrode plate 100, a positive electrode plate 200 and a diaphragm arranged between the negative electrode plate 100 and the positive electrode plate 200, wherein the diaphragm is used for separating the negative electrode plate 100 and the positive electrode plate 200. The negative electrode tab 100 includes a negative electrode foil 110, a negative electrode active material 120 coated on opposite sides of the negative electrode foil 110 in the thickness direction, and a negative electrode tab 130. The negative electrode foil 110 includes a first large end 111 and a first small end 112 opposite to each other along a length direction thereof, and the negative electrode tab 130 is disposed at the first large end 111. The positive electrode tab 200 includes a positive electrode foil 210, positive electrode active materials 220 coated on opposite sides of the positive electrode foil 210 in the thickness direction, and a positive electrode tab 230. The positive electrode foil 210 includes a second large end 211 and a second small end 212 opposite to each other along a length direction thereof, and the positive electrode tab 230 is disposed at the second large end 211. When the positive electrode tab 200 is stacked on the negative electrode tab 100 in the thickness direction, the second large end 211 corresponds to the first small end 112, and the second small end 212 corresponds to the first large end 111.
Thus, after the positive electrode tab 200 is stacked with the negative electrode tab 100, the thickness of both ends of the lamination unit in the length direction can be maintained substantially uniform. Since the first small end 112 of the negative electrode tab 100 and the second small end 212 of the positive electrode tab 200 pass through a smaller current, the overcurrent requirement can be satisfied even if the thicknesses of the first small end 112 and the second small end 212 are thinner. Because the negative electrode tab 130 is disposed at the first large end 111 and the positive electrode tab 230 is disposed at the second large end 211, the thicknesses of the first large end 111 and the second large end 211 are thicker, and the overcurrent requirement can be met, and dangerous situations such as heating and firing can not occur.
In the present embodiment, the thickness of the first large end 111 is equal to the thickness of the second large end 211, and the thickness of the first small end 112 is equal to the thickness of the second small end 212. Thus, the thickness of the two ends of the lamination unit along the length direction is equal, the lamination unit is regular, and the subsequent lamination units are conveniently stacked to form a lamination cell.
Referring to fig. 3, in one embodiment, the anode foil 110 includes a first inclined surface 113 and a first plane 114 opposite to each other along a thickness direction thereof, the first plane 114 is parallel to a horizontal plane, and an included angle between the first inclined surface 113 and the horizontal plane is a. The positive electrode foil 210 includes a second inclined plane 213 and a second plane 214 opposite to each other along the thickness direction thereof, the second plane 214 is parallel to the horizontal plane and the first plane 114, and an included angle between the second inclined plane 213 and the horizontal plane is b, and b is equal to a. When the positive electrode tab 200 is stacked on the negative electrode tab 100, the second inclined surface 213 is stacked on the first inclined surface 113 through the separator. Thus, the lamination unit is approximately rectangular, and the lamination battery cell is easier to mold.
Referring to fig. 4, in another embodiment, the anode foil 110 includes two opposite first inclined planes 113 along the thickness direction thereof, the two first inclined planes 113 are disposed in mirror symmetry, and an included angle between each first inclined plane 113 and a horizontal plane is a. The positive electrode foil 210 includes two opposite second inclined planes 213 along the thickness direction thereof, the two second inclined planes 213 are arranged in mirror symmetry, and an included angle between each second inclined plane 213 and the horizontal plane is b, wherein b is equal to a. When the positive electrode tab 200 is stacked on the negative electrode tab 100, the second inclined surface 213 is stacked on the first inclined surface 113 through the separator. In this manner, the lamination unit is substantially prismatic and may be used to form laminated cells.
In this embodiment, a is 0.5 ° or more and 5 ° or less, and b is 0.5 ° or more and 5 ° or less. When a and b are less than 0.5 °, the effect of increasing the overcurrent capacity of the first large end 111 and the second large end 211 is not achieved. When a and b are larger than 0.5 degrees, the overall thickness of the lamination unit is larger, more internal space of the battery shell is occupied, and the capacity of the battery is affected.
In the present embodiment, the separator includes a first separator 300 and a second separator 400, the negative electrode tab 100 is stacked on the first separator 300, the second separator 400 is stacked on the negative electrode tab 100, and the positive electrode tab 200 is stacked on the second separator 400.
In other embodiments, the first separator 300 and the second separator 400 are the same separator, and may be stacked between the negative electrode tab 100 and the positive electrode tab 200 in series by way of Z-stacking.
Based on the lamination units, an embodiment of the present utility model provides a lamination cell, which includes a plurality of lamination units, wherein the lamination units are stacked with each other along a thickness direction, a negative electrode plate 100 is stacked on the lamination unit on the uppermost layer through a diaphragm, and a diaphragm is stacked on the negative electrode plate 100. That is, the uppermost pole piece of the laminated battery cell is the negative pole piece 100, and the lowermost pole piece of the laminated battery cell is also the negative pole piece 100. Thus, the laminated battery cell is safer.
After the lamination unit and the lamination battery cell are stacked, the thicknesses of the two ends of the lamination unit along the length direction can be basically kept consistent. Since the first small end 112 of the negative electrode tab 100 and the second small end 212 of the positive electrode tab 200 pass through a smaller current, the overcurrent requirement can be satisfied even if the thicknesses of the first small end 112 and the second small end 212 are thinner. Because the negative electrode tab 130 is disposed at the first large end 111 and the positive electrode tab 230 is disposed at the second large end 211, the thicknesses of the first large end 111 and the second large end 211 are thicker, and the overcurrent requirement can be met, and dangerous situations such as heating and firing can not occur.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the utility model. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. A lamination unit, comprising:
the negative electrode plate comprises a negative electrode foil, negative electrode active materials and negative electrode lugs, wherein the negative electrode active materials and the negative electrode lugs are coated on two opposite sides of the negative electrode foil in the thickness direction, the negative electrode foil comprises a first large end and a first small end which are opposite in the length direction, and the negative electrode lugs are arranged at the first large end;
the positive pole piece comprises a positive pole foil, positive pole active substances and positive pole lugs, wherein the positive pole active substances and the positive pole lugs are coated on two opposite sides of the positive pole foil in the thickness direction, the positive pole foil comprises a second large end and a second small end which are opposite in the length direction, and the positive pole lugs are arranged at the second large end; and
The diaphragm is arranged between the negative pole piece and the positive pole piece and is used for separating the negative pole piece from the positive pole piece;
when the positive electrode plate is stacked on the negative electrode plate along the thickness direction, the second large end corresponds to the first small end, and the second small end corresponds to the first large end.
2. The lamination unit of claim 1, wherein the thickness of the first large end is equal to the thickness of the second large end and the thickness of the first small end is equal to the thickness of the second small end.
3. The lamination unit according to claim 2, wherein the negative electrode foil comprises a first inclined surface and a first plane which are opposite to each other along the thickness direction of the negative electrode foil, and an included angle between the first inclined surface and a horizontal plane is a; the positive electrode foil comprises a second inclined plane and a second plane which are opposite to each other along the thickness direction of the positive electrode foil, wherein the included angle between the second inclined plane and the horizontal plane is b, and b is equal to a; when the positive electrode plate is stacked on the negative electrode plate, the second inclined plane is stacked on the first inclined plane through the diaphragm.
4. The lamination unit according to claim 2, wherein the negative electrode foil comprises two opposite first inclined planes along the thickness direction thereof, the two first inclined planes are arranged in a mirror symmetry manner, and an included angle between each first inclined plane and a horizontal plane is a; the positive electrode foil comprises two opposite second inclined planes along the thickness direction of the positive electrode foil, the two second inclined planes are arranged in a mirror symmetry mode, and the included angle between each second inclined plane and the horizontal plane is b, wherein b is equal to a; when the positive electrode plate is stacked on the negative electrode plate, the second inclined plane is stacked on the first inclined plane through the diaphragm.
5. Lamination unit according to claim 3 or 4, characterized in that a is equal to or greater than 0.5 ° and equal to or less than 5 °, and b is equal to or greater than 0.5 ° and equal to or less than 5 °.
6. The lamination unit of claim 1, wherein the separator includes a first separator and a second separator, the negative electrode tab is stacked on the first separator, the second separator is stacked on the negative electrode tab, and the positive electrode tab is stacked on the second separator.
7. The lamination unit of claim 6, wherein the first and second diaphragms are the same diaphragm, and are continuously stackable between the negative pole piece and the positive pole piece by Z-stacking.
8. A laminated cell comprising a laminated unit as claimed in any one of claims 1 to 7.
9. A battery comprising a laminated cell as defined in claim 8.
10. A powered device comprising the battery of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322000824.6U CN220526956U (en) | 2023-07-27 | 2023-07-27 | Lamination unit, lamination cell, battery and electric equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322000824.6U CN220526956U (en) | 2023-07-27 | 2023-07-27 | Lamination unit, lamination cell, battery and electric equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220526956U true CN220526956U (en) | 2024-02-23 |
Family
ID=89936608
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322000824.6U Active CN220526956U (en) | 2023-07-27 | 2023-07-27 | Lamination unit, lamination cell, battery and electric equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220526956U (en) |
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2023
- 2023-07-27 CN CN202322000824.6U patent/CN220526956U/en active Active
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