CN218677196U - Battery cell and lithium ion battery - Google Patents
Battery cell and lithium ion battery Download PDFInfo
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- CN218677196U CN218677196U CN202222673750.8U CN202222673750U CN218677196U CN 218677196 U CN218677196 U CN 218677196U CN 202222673750 U CN202222673750 U CN 202222673750U CN 218677196 U CN218677196 U CN 218677196U
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- anode
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- current collector
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 9
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 9
- 238000000576 coating method Methods 0.000 claims abstract description 65
- 239000011248 coating agent Substances 0.000 claims abstract description 64
- 239000011888 foil Substances 0.000 claims abstract description 50
- 238000004804 winding Methods 0.000 claims abstract description 20
- 238000007581 slurry coating method Methods 0.000 claims abstract description 14
- 239000006183 anode active material Substances 0.000 claims abstract description 9
- 239000006182 cathode active material Substances 0.000 claims abstract description 9
- 239000011810 insulating material Substances 0.000 claims abstract description 8
- 239000006256 anode slurry Substances 0.000 claims abstract description 7
- 239000006257 cathode slurry Substances 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 9
- 238000003466 welding Methods 0.000 abstract description 8
- 239000000843 powder Substances 0.000 abstract description 7
- 230000005611 electricity Effects 0.000 abstract description 4
- 238000012797 qualification Methods 0.000 abstract description 3
- 238000005520 cutting process Methods 0.000 description 14
- 239000011149 active material Substances 0.000 description 6
- 239000013543 active substance Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000007731 hot pressing Methods 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000003556 assay Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012956 testing procedure Methods 0.000 description 1
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- 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
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- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model relates to the technical field of batteries, a electricity core and lithium ion battery is disclosed. The battery cell comprises an anode sheet, a cathode sheet and a diaphragm; the anode sheet comprises an anode current collector and an anode active material coating; the anode current collector is divided into an anode tab foil empty area, an anode slurry coating area and an anode slitting foil empty area along the width direction of the anode current collector; the cathode plate comprises a cathode current collector, an insulating coating and a cathode active material coating, wherein the cathode current collector is sequentially divided into a cathode tab empty foil area, an insulating material coating area and a cathode slurry coating area along the width direction of the cathode current collector; the insulating coating is arranged on the surface of the insulating material coating area; the anode sheet, the diaphragm and the cathode sheet are sequentially overlapped and wound into a whole, and the long edge of the anode slitting foil area falls into the range of the insulating coating in the winding state. The utility model discloses can effectively reduce the in-process positive pole such as coiling and welding and fall the powder condition, improve electric core self discharge problem, promote the security performance of electric core, improve the qualification rate of Hi-pot test.
Description
Technical Field
The utility model relates to a battery technology field especially relates to an electricity core and lithium ion battery.
Background
At present, the anode sheet is cut by cutting one out of two by using a die-cutting knife or a laser die, as shown in fig. 1, an upper-winding anode (namely, the anode sheet corresponding to a film area a) and a lower-winding anode (namely, the anode sheet corresponding to a film area B) are obtained by cutting from the middle of the film area, and due to the fact that the cutting operation directly acts on an anode active substance coating in the cutting process, active substances on the anode sheet fall off or are loose, and then loose powder falls into a diaphragm in the winding process, so that a micro short circuit occurs in an electric core, namely, the self-discharge of the electric core is increased.
In addition, for the high-power battery cell, the winding structure of the high-power battery cell is similar to the winding of a conventional BEV product, and the difference is that the lugs of the high-power battery cell are full lugs at the left side and the right side, the copper lugs are ultrasonically welded with the copper pins below the top cover, and the aluminum lugs are ultrasonically welded with the aluminum pins below the top cover. In the friction welding process of ultrasonic welding, the powder is easily dropped at the position of the slit edge of the anode sheet, so that the self-discharge of the battery cell is large.
Through high-potential (high-point) testing after winding and hot-pressing the high-power battery cell, the high-point testing defect parts of most of the battery cells are found to be at the position of the slitting edge of the anode sheet according to the testing result, the proportion of the defect parts is high, and the manufacturing cost of the battery cells is increased.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an electricity core and lithium ion battery to solve among the prior art because of the positive pole piece cut the position fall whitewashed lead to electric core from discharging bigger than normal problem.
To achieve the purpose, the utility model adopts the following technical proposal:
a cell, comprising: an anode sheet, a cathode sheet and a separator;
the anode sheet comprises an anode current collector and an anode active material coating; the anode current collector is sequentially divided into an anode tab empty foil area, an anode slurry coating area and an anode slitting empty foil area along the width direction of the anode current collector; the anode active material coating is arranged on the surface of the anode slurry coating area;
the cathode plate comprises a cathode current collector, an insulating coating and a cathode active material coating, wherein the cathode current collector is sequentially divided into a cathode tab empty foil area, an insulating material coating area and a cathode slurry coating area along the width direction of the cathode current collector; the insulating coating is arranged on the surface of the insulating material coating area, and the cathode active material coating is arranged on the surface of the cathode slurry coating area;
the anode sheet, the diaphragm and the cathode sheet are sequentially overlapped and wound into a whole, and the edge of the anode in the length direction of the anode slitting open foil area falls into the range of the insulating coating in the winding state.
Optionally, the width of the anode tab foil area is greater than the width of the anode slitting foil area.
Optionally, the width range of the anode tab foil area is 8mm-15mm, and the width range of the anode slitting foil area is 0.5mm-4mm.
Optionally, the width range of the cathode tab empty foil area is 8mm-15mm.
Optionally, the width of the insulating coating is in the range of 3mm-9mm.
Optionally, in a wound state, the lengthwise edges of the anodic-cut voided foil regions fall within a middle region within the insulating coating.
A lithium ion battery comprising the cell of any of the above.
Compared with the prior art, the embodiment of the utility model provides a following beneficial effect has:
the embodiment of the utility model provides a limit portion at the non-utmost point ear side of positive pole piece sets up the positive pole and cuts empty paper tinsel district, this regional surface is owing to not set up positive pole active material coating layer, consequently, divide in the process of cutting of preparation technology the cutter can not act on positive pole active material coating, can effectively reduce the emergence probability that positive pole active material coating leads to loose or even droing because of cutting the operation, thereby effectively reduce coiling and in-process positive pole such as welding and fall the powder and fall into the diaphragm, can effectively improve electric core self discharge problem, promote the security performance of electric core, improve the qualification rate of Hi-pot test.
And simultaneously, the embodiment of the utility model provides an at the negative pole piece with the marginal correspondence region in the empty paper tinsel district of positive pole cutting has add insulating coating, like this because insulating coating's insulating effect, even burr appears and punctures the diaphragm in the position of cutting of positive pole piece, can not cause positive anode short circuit and electric core self-discharge unusual yet, further guaranteed the security performance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the description below are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.
FIG. 1 is a schematic view of a current coated anode sheet;
FIG. 2 is a schematic view of a current coated cathode sheet;
fig. 3 is a schematic view of a coated anode sheet provided in an embodiment of the invention;
fig. 4 is a schematic view of a coated cathode sheet provided in an embodiment of the present invention;
fig. 5 is a schematic view of a sliced anode sheet provided in an embodiment of the present invention;
fig. 6 is a schematic view of a slit cathode sheet provided in an embodiment of the present invention;
fig. 7 is a schematic view of a winding structure of the anode sheet, the separator and the cathode sheet provided in the embodiment of the present invention.
Illustration of the drawings: the anode plate comprises an anode plate 1, a cathode plate 2, a diaphragm 3, an anode tab empty foil area 11, an anode active substance coating 12, an anode slitting empty foil area 13, a cathode tab empty foil area 21, an insulating coating 22, a cathode active substance coating 23, a film area A, a film area B and a slitting line L.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the embodiments described below are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In order to solve the problem that the powder easily falls off of among the prior art anode plate, the embodiment of the utility model provides an electricity core, include: anode sheet 1, cathode sheet 2 and separator 3.
The anode sheet 1, please refer to fig. 5, includes an anode current collector and an anode active material coating 12; the anode current collector is sequentially divided into an anode tab empty foil area 11, an anode slurry coating area and an anode slitting empty foil area 13 along the width direction of the anode current collector; the anode active material coating 12 is disposed on the surface of the anode slurry coating region.
The cathode sheet 2, please refer to fig. 6, includes a cathode current collector, an insulating coating 22 and a cathode active material coating 23, wherein the cathode current collector is divided into a cathode tab empty foil area 21, an insulating material coating area and a cathode slurry coating area along the width direction thereof in sequence; the insulating coating 22 is provided on the surface of the insulating material coating region, and the cathode active material coating 23 is provided on the surface of the cathode slurry coating region.
The anode sheet 1, the separator 3 and the cathode sheet 2 are sequentially stacked and wound into a whole as shown in fig. 4, and the lengthwise edge of the anode slit foil region 13 falls within the range of the insulating coating 22 in the wound state.
On the one hand, the embodiment of the utility model provides an edge portion at the non-utmost point ear side of positive pole piece 1 sets up the positive pole and cuts vacant foil district 13, this regional surface is owing to not set up the positive pole active material coating layer, consequently, the cutter can not act on positive pole active material coating 12 in the process of cutting of preparation technology, can effectively reduce positive pole active material coating 12 because of cutting the emergence probability that the operation leads to loose or even droing, thereby effectively reduce coiling and welding etc. in-process positive pole and fall the powder and fall into diaphragm 3, can effectively improve electric core self discharge problem, promote the security performance of electric core, improve the qualification rate of Hi-pot test.
On the other hand, the embodiment of the utility model provides an at the negative pole piece 2 with the edge correspondence region that empty foil district 13 was cut to the positive pole has add insulating coating 22, because insulating coating 22's insulating effect like this, even positive pole piece 1 cut the position burr appear and puncture diaphragm 3, can not cause positive anode short circuit and electric core from discharging unusually, further guaranteed the security performance.
In order to facilitate the arrangement of the anode tab, the width of the anode tab foil area 11 of the anode sheet 1 is larger than the width of the anode slitting foil area 13. Illustratively, the width of the anode tab open foil area 11 ranges from 8mm to 15mm, and the width of the anode slit open foil area 13 ranges from 0.5mm to 4mm. In order to facilitate the arrangement of the cathode tab, the width range of the cathode tab empty foil area 21 of the cathode plate 2 can be selected to be 8mm-15mm.
Meanwhile, the width of the insulating coating 22 may be selected in a range of 3mm to 9mm.
The manufacturing process of the battery cell comprises the following steps:
step 101: coating an anode active material on an anode current collector to obtain a coated anode sheet 1, as shown in fig. 3; a cathode active material is coated on the cathode current collector, and insulating coatings 22 of a certain width are coated on both long side portions of the cathode active material coating 23 to obtain a coated cathode sheet 2, as shown in fig. 4.
Step 102: and (4) respectively cold-pressing the anode strip 1 and the cathode strip 2 obtained in the step (101), and then cutting the anode strip 1 and the cathode strip 2 according to the cutting positions in the figures 3 and 4 to obtain the anode strip 1 shown in the figure 5 and the cathode strip 2 shown in the figure 6.
Since the blank foil area with a certain width is added between the film area a and the film area B of the anode sheet 1 shown in fig. 3, when the anode sheet is slit along the middle position of the blank foil area between the film area a and the film area B in this step, the die-cutting knife that slits the film area a and the film area B does not cut the anode active material coating 12.
Step 103: and winding the anode sheet 1, the cathode sheet 2 and the diaphragm 3 which are cut well according to the mode of figure 7 to obtain a winding core.
Step 104: and (4) welding the cathode tab and the cathode pin of the winding core obtained in the step (103), and welding the anode tab and the anode pin.
Step 105: and the subsequent steps are carried out according to the operations of welding the top cover of the conventional battery core, injecting liquid and the like.
Embodiment 1: the scheme shows that the self-discharge problem of the battery cell can be reduced after the insulating coating 22 is added to the cathode, and the problem of large self-discharge of the battery cell can be solved by reserving partial empty foil at the slitting position of the anode pole piece.
Comparison group: the cathode adopts a pole piece without an insulating coating 22, and the anode adopts an anode piece 1 without empty foil at a slitting position
Experimental group 1: the cathode adopts a pole piece with an insulating coating 22, and the anode adopts an anode piece 1 without empty foil at a slitting position;
experimental group 2: the cathode adopts a pole piece without an insulating coating 22, and the anode adopts an anode piece 1 with a blank foil at a slitting position;
experimental group 3: the cathode adopts a pole piece with an insulating coating 22, and the anode adopts an anode piece 1 with a blank foil at a slitting position.
The comparative group of pole pieces and the experimental group of pole pieces were each wound into 1000 cells assembled at 5.5Ah, and the cells were monitored for self-discharge at 25 ℃ by injection, formation, capacity, and then adjusted to 50% soc, i.e., the voltage drop per day, and the 30-day, 60-day voltage drop rate abnormal ratio (specification 25 ℃, 50-percent soc cell voltage drop per hour less than 0.018 mv) was counted.
| |
Comparison group | |
|
|
| Abnormal ratio of pressure drop for 30 days | 3.9％ | 2.6％ | 1.2％ | 0.3％ |
| Abnormal ratio of pressure drop for 60 days | 4.1％ | 2.6％ | 1.3％ | 0.3％ |
| Voltage zero-drop ratio of 60 days | 1.3％ | 0.9％ | 0.7％ | 0.1％ |
Embodiment 2: the scheme shows that the insulating coating 22 is added to the cathode and partial empty foil materials are reserved at the slitting position of the anode plate, so that the passing rate of the winding core in the Hi-pot testing procedure can be improved.
Comparison group: the cathode adopts a pole piece without an insulating coating 22, and the anode adopts an anode piece 1 without empty foil at a slitting position
Experimental group 1: the cathode adopts a pole piece with an insulating coating 22, and the anode adopts an anode piece 1 without empty foil at a slitting position;
experimental group 2: the cathode adopts a pole piece without an insulating coating 22, and the anode adopts an anode piece 1 with a blank foil at a slitting position;
experimental group 3: the cathode adopts a pole piece with an insulating coating 22, and the anode adopts an anode piece 1 with a blank foil at a slitting position;
the scheme is as follows: and respectively winding and assembling the comparison group pole pieces and the experiment group pole pieces into 1000 winding cores of 5.5Ah without injecting liquid, and screening out bad cells in advance through Hi-pot testing of each procedure. Testing the insulation internal resistance of the winding core by using a Hi-pot testing instrument after the hot pressing procedure, testing the Hi-pot after the winding core and the pin on the top cover are ultrasonically welded, and testing the Hi-pot after the winding core is welded with the aluminum shell after the winding core is placed into the shell (the specification is qualified if the specification is more than 10M omega, otherwise, the judgment is bad)
| Hi-pot failure rate | Comparison | Experimental group | 1 | |
|
| Hi-pot assay after hot pressing | 3.1％ | 2.2％ | 1.8％ | 0.4％ | |
| Post-ultrasonic weld measurement of Hi-pot | 2.0％ | 1.4％ | 1.0％ | 0.3％ | |
| Determination of Hi-pot after insertion into the Shell | 0.8％ | 0.5％ | 0.2％ | 0.1％ |
The embodiment of the utility model provides a lithium ion battery is still provided, include as above electric core, because the negative pole piece and the positive pole piece of this electric core have adopted special structural design, can effectively solve the problem that the positive pole piece falls the powder, consequently the lithium ion battery of this embodiment has higher security performance.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (7)
1. A battery cell, comprising: an anode sheet, a cathode sheet and a separator;
the anode sheet comprises an anode current collector and an anode active material coating; the anode current collector is sequentially divided into an anode tab empty foil area, an anode slurry coating area and an anode slitting empty foil area along the width direction of the anode current collector; the anode active material coating is arranged on the surface of the anode slurry coating area;
the cathode plate comprises a cathode current collector, an insulating coating and a cathode active material coating, wherein the cathode current collector is sequentially divided into a cathode tab empty foil area, an insulating material coating area and a cathode slurry coating area along the width direction of the cathode current collector; the insulating coating is arranged on the surface of the insulating material coating area, and the cathode active material coating is arranged on the surface of the cathode slurry coating area;
the anode sheet, the diaphragm and the cathode sheet are sequentially overlapped and wound into a whole, and the edge of the anode in the length direction of the anode slitting empty foil area falls into the range of the insulating coating in the winding state.
2. The electrical core of claim 1, wherein the width of the anode tab open foil region is greater than the width of the anode slit open foil region.
3. The cell of claim 2, wherein the width of the anode tab open foil region is in a range of 8mm to 15mm, and the width of the anode slit open foil region is in a range of 0.5mm to 4mm.
4. The electrical core of claim 1, wherein the width of the cathode tab open foil region is in a range from 8mm to 15mm.
5. The electrical core of claim 1, wherein the insulating coating has a width in a range from 3mm to 9mm.
6. The electrical core of claim 1, wherein, in a wound state, lengthwise edges of the anodic split voided foil region fall within a middle region within the confines of the insulating coating.
7. A lithium-ion battery, characterized in that it comprises a cell according to any of claims 1 to 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222673750.8U CN218677196U (en) | 2022-10-11 | 2022-10-11 | Battery cell and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222673750.8U CN218677196U (en) | 2022-10-11 | 2022-10-11 | Battery cell and lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN218677196U true CN218677196U (en) | 2023-03-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222673750.8U Active CN218677196U (en) | 2022-10-11 | 2022-10-11 | Battery cell and lithium ion battery |
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| Country | Link |
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| CN (1) | CN218677196U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118040108A (en) * | 2024-04-11 | 2024-05-14 | 宁德时代新能源科技股份有限公司 | Method for manufacturing pole piece |
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2022
- 2022-10-11 CN CN202222673750.8U patent/CN218677196U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118040108A (en) * | 2024-04-11 | 2024-05-14 | 宁德时代新能源科技股份有限公司 | Method for manufacturing pole piece |
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