CN217485478U - Pole piece structure for enhancing tab connection force - Google Patents
Pole piece structure for enhancing tab connection force Download PDFInfo
- Publication number
- CN217485478U CN217485478U CN202221304969.4U CN202221304969U CN217485478U CN 217485478 U CN217485478 U CN 217485478U CN 202221304969 U CN202221304969 U CN 202221304969U CN 217485478 U CN217485478 U CN 217485478U
- Authority
- CN
- China
- Prior art keywords
- tab
- foil
- pole piece
- piece structure
- enhancing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000002708 enhancing effect Effects 0.000 title claims description 17
- 239000011888 foil Substances 0.000 claims abstract description 55
- 239000013543 active substance Substances 0.000 claims abstract description 11
- 239000007772 electrode material Substances 0.000 claims description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 239000011889 copper foil Substances 0.000 claims description 7
- 238000009413 insulation Methods 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229920002050 silicone resin Polymers 0.000 claims description 3
- 229920006337 unsaturated polyester resin Polymers 0.000 claims description 3
- 238000005304 joining Methods 0.000 abstract description 5
- 230000003014 reinforcing effect Effects 0.000 abstract description 5
- 239000006185 dispersion Substances 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000007765 extrusion coating Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011268 mixed slurry Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model provides a pole piece structure of reinforcing utmost point ear joining power, it includes: mass flow body foil and electrode active substance layer, the centre on one of them one side of mass flow body foil extends to the direction of keeping away from mass flow body foil and forms utmost point ear, the both sides surface of mass flow body foil has all coated the electrode active substance layer, still includes: and the flexible insulating film layer covers the surfaces of two sides of one end, close to the current collector foil, of the lug. The utility model discloses utilize the flexible insulating rete to support the protection to mass flow body foil and utmost point ear junction, avoid stress concentration, dispersion stress to the intensity of utmost point ear has been improved.
Description
Technical Field
The utility model relates to a lithium cell technical field especially relates to a pole piece structure of reinforcing utmost point ear joining power.
Background
In order to increase the energy density of lithium ion batteries, the thicknesses of metal copper foil current collectors and aluminum foil current collectors, which are important electrode components, are increasingly thinner in the battery design and practical industrialization processes. The problem that follows is that the strength of the foil decreases and wrinkles and tears easily occur during the production process. Especially for soft pack laminated batteries, the non-rigid shell is not enough for protecting the tabs in the daily transfer process and is very easy to cause the foil to break at the position extending out of the tabs along with the stress generated by the expansion of the tabs in the later cycle process. The main reason that the fracture position occurs at the tab is that the size change at the connection position between the foil and the tab is large, and stress concentration is easily generated, so that when the position of the internal structure deviates due to the expansion or external force action of the battery, force is easily applied to the connection position of the tab and the foil to generate mechanical fatigue, and finally the tab is fractured.
How to overcome the problem and improve the structural strength and the service life of a tab structure in the battery becomes a technical problem to be solved urgently in the field.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a pole piece structure of reinforcing utmost point ear joining force.
The technical scheme of the utility model is realized like this: the utility model provides a pole piece structure of reinforcing utmost point ear joining force, it includes: mass flow body foil and electrode active substance layer, the centre on one of them one side of mass flow body foil extends to the direction of keeping away from mass flow body foil and forms utmost point ear, the both sides surface of mass flow body foil has all coated the electrode active substance layer, still includes: the flexible insulating film layer covers the surfaces of two sides of one end, close to the current collector foil, of the lug, and the thickness of the flexible insulating film layer is not more than 50 microns.
On the basis of the technical scheme, the electrode active substance layer covers the surfaces of two sides of one end, close to the current collector foil, of the pole lug.
On the basis of the technical scheme, preferably, the electrode active substance layer on the surface of the tab is positioned between the flexible insulating film layer and the tab.
On the basis of the technical scheme, preferably, the length of the insulating flexible film layer covering the exposed area of the pole lug is not more than half of the length of the pole lug, and the length of the insulating flexible film layer covering the electrode active material layer is not more than half of the length of the electrode active material layer positioned above the pole lug.
On the basis of the technical scheme, preferably, the edges of the flexible insulating film layers on the two sides of the pole lug are connected with each other and are arranged on the outer side of the pole lug in a surrounding mode.
On the basis of the technical scheme, preferably, the thickness of the flexible insulating film layer along the extending direction of the tab, which is far away from the current collector foil, is gradually reduced.
On the basis of the above technical scheme, preferably, the current collector foil is an aluminum foil, and the thickness of the aluminum foil is less than 15 μm.
On the basis of the technical scheme, preferably, the current collector foil is a copper foil, and the thickness of the copper foil is less than 10 μm.
In addition to the above, preferably, the thickness of the electrode active material layer is greater than 100 μm.
On the basis of the above technical solution, preferably, the flexible insulating film layer is made of one of flexible epoxy resin material, flexible silicone resin and flexible unsaturated polyester resin.
The utility model discloses for prior art following beneficial effect has:
(1) the utility model discloses a position of connection between utmost point ear and the mass flow body cladding flexible insulation film, utilize the flexible insulation film to carry out the cladding to the position of connection between utmost point ear and the mass flow body, thereby can strengthen the structural strength of utmost point ear, utilize the flexible characteristics of flexible insulation film simultaneously, make it have certain yield when receiving the exogenic action, thereby alleviate stress concentration, avoid utmost point ear to appear stress fatigue because of taking place too extensive repeated bending simultaneously;
(2) furthermore, the flexible insulating film has an insulating effect, can also prevent the roots of the exposed lugs from being in lap joint and short circuit, and plays a role in spacing, thereby further improving the safety performance of the pole piece structure;
(3) further, carry out attenuate gradually to flexible insulating film layer along utmost point ear extending direction's thickness in this application to make utmost point ear free end and flexible insulating film layer junction position department be difficult to take place stress concentration, combine the length of insulating film layer self, make utmost point ear difficult the emergence of extending buckle by a wide margin.
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 following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is an isometric view of a pole piece structure for enhancing tab connection force according to the present invention;
fig. 2 is an exploded view of the pole piece structure for enhancing the tab connection force of the present invention;
fig. 3 is a side sectional view of the pole piece structure for enhancing the connecting force of the tab of the present invention.
In the figure: 1-current collector foil, 2-electrode active substance layer, 3-pole ear and 4-flexible insulating film layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.
As shown in fig. 1, in combination with fig. 2-3, the pole piece structure for enhancing the connecting force of the tab of the present invention includes: mass flow body foil 1, electrode active substance layer 2 and flexible insulating rete 4, the wherein middle on one side of mass flow body foil 1 extends to the direction of keeping away from mass flow body foil 1 and forms utmost point ear 3, the both sides surface of mass flow body foil 1 all coats and has electrode active substance layer 2, flexible insulating rete 4 covers the one end both sides surface that is close to mass flow body foil 1 at utmost point ear 3, the thickness of flexible insulating rete 4 is no more than 50 mu m.
In the above embodiment, the size of the joint between the tab 3 and the current collector foil 1 suddenly changes, so that the mechanical strength of the tab 3 is greatly reduced compared with the current collector foil 1, when the electrode sheet is subjected to an external force action as a whole, such as a pulling force generated by a local displacement caused by size expansion or a pressure caused by collision of an external structure, the tab 3 is more easily deformed relative to the current collector foil 1, and a stress finally generated by the deformation acts on the root of the tab 3 due to a stress concentration effect, in this embodiment, the flexible insulating film layer 4 covers the surface of the tab 3, so that the mechanical strength of the tab 3 in a corresponding area is directly enhanced, the tab 3 is less likely to deform under the condition of receiving an external force, the flexible insulating film layer 4 can flexibly deform, the stress can be dispersed, stress concentration is avoided, and the mechanical strength of the tab 3 is improved, meanwhile, the flexible insulating film layer 4 can also play a good insulating effect, and can avoid short circuit caused by contact of the tab 3 and an adjacent tab or a current collector.
In a specific embodiment, two side surfaces of one end of the tab 3 close to the current collector foil 1 are covered with electrode active material layers 2.
In the above embodiment, the electrode active material layer 2 is extended and disposed on the tab 3, so as to play a role of partition, prevent the portion of the tab 3 connected with the current collector foil 1 from being exposed, and play a role of certain structural reinforcement.
In a specific embodiment, the electrode active material layer 2 on the surface of the tab 3 is located between the flexible insulating film layer 4 and the tab 3.
In the above embodiment, the flexible insulating film layer 4 may cover the edge of the electrode active material layer 2, thereby playing a certain role in protecting, on one hand, the mechanical strength is enhanced, and on the other hand, short circuit is prevented.
In a specific embodiment, the length of the insulating flexible film layer 4 covering the exposed area of the tab 3 is no more than half of the length of the tab 3, and the length of the insulating flexible film layer 4 covering the electrode active material layer 2 is no more than half of the length of the electrode active material layer 2 above the tab 3.
In the above embodiment, the insulating flexible film layer 4 needs to cover and protect the tab 3 and the electrode active material layer 2, on the one hand, the mechanical strength is improved, on the other hand, the safety performance is improved, the short circuit is avoided, and meanwhile, the coating area of the insulating flexible film layer 4 is not too large, so that the tab 3 is exposed in the welding process, and the damage to the flexible insulating film layer 4 in the welding process is avoided, so that the tab is ignited.
In the specific embodiment, the edges of the flexible insulating film layers 4 on both sides of the tab 3 are connected with each other and are circumferentially arranged outside the tab 3.
In the above embodiment, the flexible insulating film layer 4 which is arranged in a surrounding manner can wrap the tab 3 better and comprehensively, so that the tab has a better insulating effect, and the flexible insulating film layers 4 on the two sides are not easy to fall off.
In a specific embodiment, the thickness of the flexible insulating film layer 4 gradually decreases along the extension direction of the tab 3 away from the current collector foil 1.
In the above embodiment, because the stress concentration effect that utmost point ear 3 is close to the one end of current collector foil 1 is than stronger, consequently, the flexible insulating rete 4 thickness in this department can set up thickly, thereby reach better supporting effect, and keep away from the one side of current collector foil 1 at utmost point ear 3, because the degree of freedom is great, the volume of displacement takes place simultaneously is not big, consequently set up thinner flexible insulating rete 4, can make it produce certain transition effect, avoid flexible insulating rete 4 and utmost point ear 3 surface to produce stress concentration.
In a specific embodiment, the current collector foil 1 may be an aluminum foil, the thickness of which is less than 15 μm.
In a specific embodiment, the current collector foil 1 may be a copper foil, and the thickness of the copper foil is less than 10 μm.
In a specific embodiment, the thickness of the electrode active material layer 2 is greater than 100 μm.
In a specific embodiment, the flexible insulating film layer 4 is made of one of a flexible epoxy resin material, a flexible silicone resin and a flexible unsaturated polyester resin.
The utility model discloses a pole piece structure preparation method of reinforcing utmost point ear joining force as follows:
the mixed slurry of the electrode active material layer 2 which is uniformly mixed is coated on the surfaces of two sides of a current collector foil 1 in a transfer coating mode, a bare foil is reserved on one side edge, the bare foil is dried and wound immediately, a tab 3 is cut on the side where the bare foil is reserved, the coating of a flexible insulating film layer 4 is uniformly coated on the joint of the bare foil and the electrode active material layer 2 in an extrusion coating mode, and then a film is formed after high-temperature curing, so that a pole piece structure for enhancing the connection force of the tab is obtained.
Further, in order to make the thickness of flexible insulating film layer 4 in the in-process of being close to the tip of utmost point ear 3, thickness attenuate gradually, can utilize the relative utmost point ear 3 place plane slope setting of scraper blade, carry out the processing of scraping of local attenuate to the even flexible insulating film layer of extrusion coating.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A pole piece structure for enhancing tab attachment force, comprising: mass flow body foil (1) and electrode active substance layer (2), the wherein middle on one side of mass flow body foil (1) extends to the direction of keeping away from mass flow body foil (1) and forms utmost point ear (3), the both sides surface of mass flow body foil (1) all coats and has electrode active substance layer (2), its characterized in that still includes: flexible insulating rete (4), flexible insulating rete (4) cover is close to the one end both sides surface of mass flow body foil (1) in utmost point ear (3), the thickness of flexible insulating rete (4) is no longer than 50 mu m.
2. The pole piece structure for enhancing the tab connection force as claimed in claim 1, wherein the electrode active material layer (2) covers both surfaces of one end of the tab (3) close to the current collector foil (1).
3. The pole piece structure for enhancing tab connection force according to claim 2, wherein the edge of the electrode active material layer (2) on the surface of the tab (3) is located between the flexible insulating film layer (4) and the tab (3).
4. The pole piece structure for enhancing the tab connection force according to claim 3, wherein the length of the flexible insulation film layer (4) covering the exposed area of the tab (3) is not more than half of the length of the tab (3), and the length of the flexible insulation film layer (4) covering the electrode active material layer (2) is not more than half of the length of the electrode active material layer (2) above the tab (3).
5. The pole piece structure for enhancing tab connection force according to claim 1, wherein the edges of the flexible insulation film layers (4) at both sides of the tab (3) are connected with each other and arranged around the outside of the tab (3).
6. The pole piece structure for enhancing tab connection force according to claim 1, wherein the thickness of the flexible insulating film layer (4) is gradually reduced along the extension direction of the tab (3) away from the current collector foil (1).
7. The pole piece structure for enhancing the tab connection force as claimed in claim 1, wherein the current collector foil (1) is an aluminum foil, and the thickness of the aluminum foil is less than 15 μm.
8. The pole piece structure for enhancing the tab connection force of claim 1, wherein the current collector foil (1) is a copper foil, and the thickness of the copper foil is less than 10 μm.
9. The pole piece structure for enhancing tab connection force according to claim 1, wherein the thickness of the electrode active material layer (2) is more than 100 μm.
10. The pole piece structure for enhancing tab connection force as claimed in claim 1, wherein the flexible insulation film layer (4) is one of flexible epoxy resin, flexible silicone resin and flexible unsaturated polyester resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221304969.4U CN217485478U (en) | 2022-05-27 | 2022-05-27 | Pole piece structure for enhancing tab connection force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221304969.4U CN217485478U (en) | 2022-05-27 | 2022-05-27 | Pole piece structure for enhancing tab connection force |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217485478U true CN217485478U (en) | 2022-09-23 |
Family
ID=83312807
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221304969.4U Active CN217485478U (en) | 2022-05-27 | 2022-05-27 | Pole piece structure for enhancing tab connection force |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217485478U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115692722A (en) * | 2022-11-08 | 2023-02-03 | 厦门海辰储能科技股份有限公司 | Composite current collector, battery core, battery and preparation method of composite current collector |
| CN116031584A (en) * | 2023-03-27 | 2023-04-28 | 宁德新能源科技有限公司 | Electrochemical device and electric equipment |
-
2022
- 2022-05-27 CN CN202221304969.4U patent/CN217485478U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115692722A (en) * | 2022-11-08 | 2023-02-03 | 厦门海辰储能科技股份有限公司 | Composite current collector, battery core, battery and preparation method of composite current collector |
| CN115692722B (en) * | 2022-11-08 | 2024-01-26 | 厦门海辰储能科技股份有限公司 | Composite current collector, battery cell, battery and preparation method of composite current collector |
| CN116031584A (en) * | 2023-03-27 | 2023-04-28 | 宁德新能源科技有限公司 | Electrochemical device and electric equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN217485478U (en) | Pole piece structure for enhancing tab connection force | |
| CN216698661U (en) | Electrode assembly and battery cell | |
| CN208507818U (en) | Secondary cell and its pole piece | |
| EP3985763B1 (en) | Electrode assembly and battery unit | |
| CN210535760U (en) | Electrode assembly and secondary battery | |
| CN208819970U (en) | Secondary cell | |
| JP5186529B2 (en) | Lithium secondary battery | |
| EP3703148B1 (en) | Secondary battery | |
| JP7193626B2 (en) | Secondary battery and its electrode member | |
| CN209183628U (en) | Secondary cell and its pole piece | |
| JP2006012836A (en) | Secondary battery | |
| CN209401732U (en) | Electrode assembly and secondary cell | |
| EP3907819B1 (en) | Secondary battery | |
| CN106654139B (en) | Lug and pole piece switching structure, battery cell and manufacturing method thereof | |
| KR100911004B1 (en) | Battery unit and the lithium secondary battery applying the same | |
| CN112930616A (en) | Battery cell, battery using battery cell and electronic equipment | |
| CN209104259U (en) | Secondary cell | |
| WO2020177598A1 (en) | Secondary battery and forming method therefor | |
| WO2020130001A1 (en) | Electrode plate for secondary batteries, and secondary battery using same | |
| CN217158365U (en) | Button cell and shell thereof | |
| CN211957817U (en) | Soft package lithium battery | |
| JP2000215879A (en) | Polymer electrolyte battery | |
| CN219626685U (en) | Battery and electrochemical device | |
| CN219040539U (en) | Lithium ion battery pole group unit, battery pole group and lithium ion battery | |
| CN215299296U (en) | Pole piece for winding type lithium ion cell and winding type lithium ion cell |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |