CN220306467U - Stepped tab structure - Google Patents
Stepped tab structure Download PDFInfo
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- CN220306467U CN220306467U CN202321952894.5U CN202321952894U CN220306467U CN 220306467 U CN220306467 U CN 220306467U CN 202321952894 U CN202321952894 U CN 202321952894U CN 220306467 U CN220306467 U CN 220306467U
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- layer
- tab
- positive electrode
- stepped
- utility
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- 238000000034 method Methods 0.000 claims abstract description 9
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 10
- 239000011889 copper foil Substances 0.000 claims description 10
- 238000005056 compaction Methods 0.000 claims description 9
- 229910052782 aluminium Inorganic materials 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 7
- 239000011888 foil Substances 0.000 claims description 7
- 238000003466 welding Methods 0.000 abstract description 15
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 6
- 229910052744 lithium Inorganic materials 0.000 abstract description 6
- 238000004880 explosion Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000005520 cutting process Methods 0.000 description 13
- 238000004519 manufacturing process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 239000005030 aluminium foil Substances 0.000 description 3
- 239000012634 fragment Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000010405 anode material Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model relates to the technical field of lithium batteries. Particularly, the utility model relates to a stepped tab structure, which comprises a positive tab layer and a negative tab layer, wherein the number of the positive tab layer and the negative tab layer is i, i=2, 3, … … and n; the positive electrode tab layers of the i layers are sequentially stacked, and the height H of the positive electrode tab layer of the i th layer c1i The method comprises the following steps: h c1i =a+ (Ac/dc+aa/da+ha+hc+hd+2) (i-1) +hd+2+aa/da+hc; the i layers of the negative electrode tab layers are sequentially stacked, and the height H of the i-th layer of the negative electrode tab layer c2i The method comprises the following steps: h c2i =a+ (Ac/dc+aa/da+ha+hc+hd×2) (i-1) +hd×2. The utility model relates to a stepped tabThe structure redesigns the height of anodal utmost point ear layer and negative pole utmost point ear layer, anodal utmost point ear layer and negative pole utmost point ear layer are the neat shape after ultrasonic welding, need not cut the operation any longer, consequently can avoid the utmost point ear to cut the piece that produces and enter into the electric core in the middle of, pierces through the diaphragm and causes electric core short circuit, causes the circumstances of electric core fire explosion even. The utility model also omits redesign of the fixture, and is beneficial to reducing the investment of equipment and manpower.
Description
Technical Field
The utility model relates to the field of lithium ion batteries, in particular to a stepped tab structure.
Background
Lithium batteries are increasingly demanded in the fields of new energy automobiles, mobile communication, electronic equipment and the like due to the outstanding characteristics of long cycle life, low internal resistance, large specific energy, no memory effect, no pollution and the like. With the continuous development of lithium batteries and the expansion of application scenes, it is important to improve the safety and stability of the batteries, so as to better protect the safety of consumers.
In the production process of the lithium battery, in the cutting process of the electrode lugs after ultrasonic welding, generated metal scraps possibly pierce a diaphragm in the battery core to cause the short circuit of the battery core, so that safety accidents such as fire explosion and the like of the battery core are caused. Therefore, there is a need for improvement in tabs of lithium batteries.
Disclosure of Invention
In order to avoid adverse effects caused by tab cutting, the application provides a stepped tab structure.
The stepped lug structure provided by the utility model adopts the following technical scheme:
the step-type tab structure comprises a positive electrode tab layer and a negative electrode tab layer, wherein the number of the positive electrode tab layer and the number of the negative electrode tab layer are i, i=2, 3, … … and n;
the positive electrode tab layers of the i layers are sequentially stacked, and the height H of the positive electrode tab layer of the i th layer c1i The method comprises the following steps:
H c1i ＝a+(Ac/Dc+Aa/Da+Ha+Hc+Hd*2)(i-1)+Hd*2+Aa/Da+Hc；
i layers of the cathode tab layers are sequentially stackedHeight H of the ith negative electrode tab layer c2i The method comprises the following steps:
H c2i ＝a+(Ac/Dc+Aa/Da+Ha+Hc+Hd*2)(i-1)+Hd*2；
wherein a is the basic height of the stepped tab structure; ac is the positive electrode surface density; dc is the positive electrode compacted density; aa is the negative electrode areal density; da is the negative pole compaction density; ha is the thickness of the aluminum foil; hc is the thickness of the copper foil; hd is the diaphragm thickness.
Optionally, the height a of the stepped tab structure beyond the diaphragm is between 10mm and 100mm.
Optionally, the positive electrode surface density Ac is between 100g/m 2 ～800g/m 2 Between them.
Optionally, the positive electrode compacted density Dc is between 1.0g/cm 3 ～4.0g/cm 3 Between them.
Optionally, the anode surface density Aa is between 100g/m 2 ～800g/m 2 Between them.
Optionally, the negative electrode compaction density Da is between 1.0g/cm 3 ～4.0g/cm 3 Between them.
Optionally, the thickness Ha of the aluminum foil is between 6 μm and 30 μm.
Optionally, the thickness Hc of the copper foil is between 3 μm and 20 μm.
Optionally, the membrane thickness Hd is between 5 μm and 30 μm.
As described above, the present utility model has at least the following advantageous effects:
1. the height of the positive electrode tab layer and the height of the negative electrode tab layer are redesigned by the stepped tab structure, the end parts of the positive electrode tab layer and the negative electrode tab layer are in a neat shape after ultrasonic welding, and cutting operation is not needed, so that fragments generated by tab cutting can be prevented from entering a battery cell, and the situation that the battery cell is short-circuited and even the battery cell is ignited and exploded due to the fact that a diaphragm is pierced can be avoided.
2. The stepped tab structure is automatically aligned after ultrasonic welding, tab cutting is not needed, so that the design time of a tab cutting procedure fixture and the purchase cost of the fixture equipment are saved, the production efficiency and the production yield of the tab are improved, and the investment of equipment and manpower is reduced.
Drawings
Fig. 1 is a schematic view of a prior art tab prior to ultrasonic welding to shape.
Fig. 2 is a schematic view of the shape of a tab of the prior art after ultrasonic welding.
Fig. 3 is a schematic view showing the shape of a stepped tab structure before ultrasonic welding according to an embodiment of the present utility model.
Fig. 4 is a schematic view showing the shape of the stepped tab structure after ultrasonic welding according to an embodiment of the present utility model.
Reference numerals: 1. a positive electrode tab layer; 2. and a negative electrode tab layer.
Detailed Description
Other advantages and effects of the present utility model will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present utility model with reference to specific examples. The utility model may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present utility model. It should be noted that the following embodiments and features in the embodiments may be combined with each other without conflict. It is also to be understood that the terminology used in the examples of the utility model is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the utility model. The test methods in the following examples, in which specific conditions are not noted, are generally conducted under conventional conditions or under conditions recommended by the respective manufacturers.
Please refer to fig. 1 and 2. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the utility model, are not intended to be critical to the essential characteristics of the utility model, but are intended to fall within the spirit and scope of the utility model. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the utility model, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the utility model may be practiced.
Referring to fig. 1, the tab is a metal electrical conductor for leading out the positive and negative electrodes of the battery cell from the inside of the battery cell, and is formed by stacking a plurality of tab layers. The conventional lithium battery tab is mainly of an equal-height structure, i.e., the heights of the tab layers are equal, as shown in fig. 1, i.e., the tab having the equal-height structure, and in fig. 1, the height of the tab is the length of the tab in the vertical direction.
In actual use, the electrode lugs are required to be welded into a whole through an ultrasonic welding mode, after welding, the height of each electrode lug layer is equal, each electrode lug layer has a certain thickness, the electrode lugs can be bent into the shape shown in fig. 2, and in order not to affect subsequent welding and other working procedures, uneven parts of the end parts of the electrode lugs are required to be cut, and the parts shown in a cutting area in fig. 2 are parts of the end parts of the electrode lugs which need to be cut. The fragments generated by cutting the electrode lugs pierce the diaphragm in the battery core to cause the battery core to be short-circuited, so that the battery core can be subjected to safety accidents such as fire explosion and the like.
Referring to fig. 3 and 4, in order to avoid adverse effects caused by tab cutting, the present utility model provides a stepped tab structure, which includes a positive tab layer 1 and a negative tab layer 2, wherein the number of the positive tab layer 1 and the negative tab layer 2 is i, i=2, 3, … …, n.
Specifically, the positive electrode tab layer 1 is an i-layer aluminum foil layer, and the negative electrode tab layer 2 is an i-layer copper foil layer. The positive pole of electricity core is connected to the aluminium foil layer, and the negative pole of electricity core is connected to the copper foil layer, and copper foil layer and aluminium foil layer are coiled layer by layer, then draw forth respectively from the electricity core to form anodal utmost point ear layer 1 and negative pole utmost point ear layer 2 to inside the electricity core, insulate through the diaphragm between copper foil layer and the aluminium foil layer.
The i-layer positive electrode tab layer 1 is led out from the battery core and then is in a sequentially stacked state, and in order to form the positive electrode tab layer 1 in a state of being orderly formed at the end part after ultrasonic welding, the height H of the i-layer positive electrode tab layer 1 c1i Is set as follows:
H c1i ＝a+(Ac/Dc+Aa/Da+Ha+Hc+Hd*2)(i-1)+Hd*2+Aa/Da+Hc。
the i-layer negative electrode tab layer 2 is led out from the battery cell and then is in a sequentially stacked state, and in order to form the negative electrode tab layer 2 in a neat state at the end after ultrasonic welding, the height H of the i-layer negative electrode tab layer 2 c2i Is set as follows:
H c2i ＝a+(Ac/Dc+Aa/Da+Ha+Hc+Hd*2)(i-1)+Hd*2。
in the above two formulas, a is the basic height of the stepped tab structure, the larger the value of a is, the larger the overall height of the positive electrode tab layer 1 and the negative electrode tab layer 2 is, and the value of a is between 10 and 100mm and can be 10mm, 20mm, 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm and 100mm.
Ac is the positive electrode surface density, namely the weight of positive electrode substances contained in the unit area of the positive electrode lug layer 1, and the thicker the positive electrode surface density is, the thicker the positive electrode lug layer 1 is, and the value of Ac is 100g/m 2 ～800g/m 2 Can be 100g/m 2 、200g/m 2 、300g/m 2 、400g/m 2 、500g/m 2 、600g/m 2 、700g/m 2 、800g/m 2 。
Dc is positive electrode compaction density, the positive electrode compaction density mainly represents the weight of the positive electrode lug layer 1 in a unit volume in an absolute compact state, the greater the positive electrode compaction density is, the thicker the positive electrode lug layer 1 is, and the value of Dc is 1.0g/cm 3 ～4.0g/cm 3 Can be 1.0g/cm 3 、2.0g/cm 3 、3.0g/cm 3 、4.0g/cm 3 。
Aa is the anode surface density, i.e., the weight of the anode material contained in the unit area of the anode tab layer 2, and the larger the anode surface density isThe thicker the ear layer 2 is, the value of Ac is 100g/m 2 ～800g/m 2 Can be 100g/m 2 、200g/m 2 、300g/m 2 、400g/m 2 、500g/m 2 、600g/m 2 、700g/m 2 、800g/m 2 。
Da is the negative electrode compaction density, the negative electrode compaction density mainly represents the weight of the unit volume of the negative electrode tab layer 2 in an absolute compact state, the greater the negative electrode compaction density is, the thicker the negative electrode tab layer 1 is, and the value of Dc is 1.0g/cm 3 ～4.0g/cm 3 Can be 1.0g/cm 3 、2.0g/cm 3 、3.0g/cm 3 、4.0g/cm 3 。
Ha is the thickness of the aluminum foil, namely the thickness of the positive electrode tab layer 1, and the value of Ha is between 6 μm and 30 μm and can be 6 μm, 10 μm, 15 μm, 20 μm, 25 μm and 30 μm.
Hc is the thickness of the copper foil, namely the thickness of the cathode tab layer 2, and the value of Hc is 3-20 μm and can be 3 μm, 5 μm, 15 μm or 20 μm.
Hd is the thickness of the diaphragm, and the Hd has a value of 5 μm-30 μm and can be 5 μm, 10 μm, 15 μm, 20 μm, 25 μm or 30 μm.
In another embodiment of the present utility model, the copper foil layer, the aluminum foil layer and the separator are laminated structures, and the two are equally applicable.
After the heights of the positive electrode tab layer 1 and the negative electrode tab layer 2 are redesigned, the ends of the positive electrode tab layer 1 and the negative electrode tab layer 2 are in a neat shape after ultrasonic welding, and cutting operation is not needed, so that fragments generated by cutting the tabs can be prevented from entering the battery core, and the situation that the battery core is short-circuited and even the battery core explodes due to the fact that the separator is pierced can be avoided.
The stepped tab structure is automatically aligned after ultrasonic welding, tab cutting is not needed, so that the design time of a tab cutting procedure fixture and the purchase cost of the fixture equipment are saved, the production efficiency and the production yield of the tab are improved, and the investment of equipment and manpower is reduced.
The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (9)
1. The stepped tab structure is characterized by comprising a positive electrode tab layer (1) and a negative electrode tab layer (2), wherein the number of the positive electrode tab layer (1) and the number of the negative electrode tab layer (2) are i, i=2, 3, … … and n;
the i layers of the positive electrode lug layers (1) are sequentially stacked, and the height H of the i-th layer of the positive electrode lug layer (1) c1i The method comprises the following steps:
H c1i ＝a+(Ac/Dc+Aa/Da+Ha+Hc+Hd*2)(i-1)+Hd*2+Aa/Da+Hc；
the i layers of the negative electrode tab layers (2) are sequentially stacked, and the height H of the i-th layer of the negative electrode tab layer (2) c2i The method comprises the following steps:
H c2i ＝a+(Ac/Dc+Aa/Da+Ha+Hc+Hd*2)(i-1)+Hd*2；
wherein a is the basic height of the stepped tab structure;
ac is the positive electrode surface density;
dc is the positive electrode compacted density;
aa is the negative electrode areal density;
da is the negative pole compaction density;
ha is the thickness of the aluminum foil;
hc is the thickness of the copper foil;
hd is the diaphragm thickness.
2. The stepped tab structure of claim 1, wherein: the height a of the stepped tab structure beyond the diaphragm is between 10mm and 100mm.
3. According to claim1, characterized in that: the positive electrode surface density Ac is between 100g/m 2 ～800g/m 2 Between them.
4. The stepped tab structure of claim 1, wherein: the positive electrode compacted density Dc is 1.0g/cm 3 ～4.0g/cm 3 Between them.
5. The stepped tab structure of claim 1, wherein: the negative electrode surface density Aa is 100g/m 2 ～800g/m 2 Between them.
6. The stepped tab structure of claim 1, wherein said negative compacted density Da is between 1.0g/cm 3 ～4.0g/cm 3 Between them.
7. The stepped tab structure of claim 1, wherein the aluminum foil thickness Ha is between 6 μιη and 30 μιη.
8. The stepped tab structure of claim 1, wherein said copper foil has a thickness Hc of between 3 μm and 20 μm.
9. The stepped tab structure of claim 1, wherein said separator thickness Hd is between 5 μιη and 30 μιη.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321952894.5U CN220306467U (en) | 2023-07-21 | 2023-07-21 | Stepped tab structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321952894.5U CN220306467U (en) | 2023-07-21 | 2023-07-21 | Stepped tab structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220306467U true CN220306467U (en) | 2024-01-05 |
Family
ID=89374830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321952894.5U Active CN220306467U (en) | 2023-07-21 | 2023-07-21 | Stepped tab structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220306467U (en) |
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2023
- 2023-07-21 CN CN202321952894.5U patent/CN220306467U/en active Active
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