CN218827228U - Pole piece and battery - Google Patents
Pole piece and battery Download PDFInfo
- Publication number
- CN218827228U CN218827228U CN202222619243.6U CN202222619243U CN218827228U CN 218827228 U CN218827228 U CN 218827228U CN 202222619243 U CN202222619243 U CN 202222619243U CN 218827228 U CN218827228 U CN 218827228U
- Authority
- CN
- China
- Prior art keywords
- current collector
- empty foil
- foil area
- pole piece
- groove
- 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.)
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Links
- 239000011888 foil Substances 0.000 claims abstract description 90
- 238000003466 welding Methods 0.000 claims abstract description 25
- 230000007704 transition Effects 0.000 claims description 9
- 229910000679 solder Inorganic materials 0.000 claims description 4
- 239000010410 layer Substances 0.000 claims 7
- 239000012790 adhesive layer Substances 0.000 claims 1
- 239000011800 void material Substances 0.000 claims 1
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 abstract 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 abstract 1
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 abstract 1
- 239000002699 waste material Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000011149 active material Substances 0.000 description 2
- 239000013543 active substance Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M4/00—Electrodes
- H01M4/02—Electrodes composed of, or comprising, active material
- H01M4/64—Carriers or collectors
- H01M4/70—Carriers or collectors characterised by shape or form
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/531—Electrode connections inside a battery casing
- H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
-
- 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
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Connection Of Batteries Or Terminals (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The utility model belongs to the technical field of batteries, in particular to a pole piece and a battery, wherein the pole piece comprises a current collector, an active layer and a pole ear; the active layer is coated on the surfaces of the two sides of the current collector; removing the active layer from a predetermined area of the first side surface of the current collector to form a first empty foil region having a first opening facing upward and a second opening perpendicular to the first side surface of the current collector; one end of the tab extends into the first empty foil area and is welded on the first side surface of the current collector, and the other end of the tab extends out of the first empty foil area; the distance between the bottom surface of the tab and the bottom wall of the first empty foil area is 2-6mm, and the distance between the right side surface of the tab and the right side wall of the first empty foil area is 0.1-0.2 times the width of the first empty foil area. According to the utility model discloses pole piece is through setting for utmost point ear and empty relative position in the paper tinsel district to select best utmost point ear welding position, guarantee utmost point ear and current collection body's welding strength, reduce the emergence of rosin joint phenomenon.
Description
Technical Field
The utility model belongs to the technical field of the battery, especially, relate to a pole piece and battery.
Background
The existing tab welding technology is divided into an external tab and an embedded tab.
After the foil is uniformly coated with active substances for the external tab, the head and the tail of the foil are provided with empty foil areas for placing the tab and then welding, and the empty foil areas of the electrode pieces are used for avoiding the situation that more empty foil areas are reserved for burrs of the tab, so that the waste of resources is caused, and the loss of the energy density of the battery cell is brought.
And compare in external utmost point ear welding technique, embedded utmost point ear is after evenly coating the active material with the foil, and the pole piece passes through laser and washes and expose empty paper tinsel district, places utmost point ear and welds on blank foil, and this technology can improve the energy density of electric core, but the right angle shape part in empty paper tinsel district can increase the waste material, corrugates easily simultaneously, and unreasonable welding position can lead to utmost point ear slope or even drop.
The existing embedded type lug welding technology has the problems of welding resource waste, lug falling and the like due to unreasonable welding positions.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: the problem that the welding position is unreasonable exists in the existing embedded type, and a pole piece and a battery are provided.
In order to solve the above technical problem, on one hand, an embodiment of the present invention provides a pole piece, including a current collector, an active layer and a tab;
the active layers are coated on the surfaces of the two sides of the current collector;
removing the active layer from a predetermined area of the first side surface of the current collector to form a first empty foil region having a first opening facing upward and a second opening perpendicular to the first side surface of the current collector;
one end of the tab extends into the first empty foil area and is welded on the first side surface of the current collector, and the other end of the tab extends out of the first empty foil area; the distance between the bottom surface of the tab and the bottom wall of the first empty foil area is 2-6mm, and the distance between the right side surface of the tab and the right side wall of the first empty foil area is 0.1-0.2 times of the width of the first empty foil area.
Optionally, the first empty foil area is rectangular, and two corners of the bottom of the first empty foil area are in arc transition; the diameter of the arc-shaped transition is larger than the width of the first empty foil area.
Optionally, the length of the first empty foil area is 15-30mm, and the width of the first empty foil area is 8-12mm.
Optionally, the active layer extends towards two sides of the opening of the first empty foil area to form protrusions respectively, the upper surfaces of the protrusions are flush with the upper surface of the current collector, and the tabs protrude out of the current collector from two opposite sides of the protrusions.
Optionally, the surface of the tab far away from the current collector is provided with a welding mark, and the distance between the bottom edge of the welding mark and the bottom wall of the first empty foil area is 2.5-3mm; the distance between the upper edge of the welding seal and the upper surface of the groove is 3-8mm; the distance between the bottom edge of the welding print and the bottom surface of the bulge is 1.5-2mm.
Optionally, a glue layer is attached to the solder print.
Optionally, the area of the opposite side of the two protrusions is provided with a groove, the cross-sectional shape of the groove is rectangular, the groove is formed by cutting off the current collector and the active layer in the cross-sectional shape of the groove, and the length of the groove parallel to the current collector is 0.8-1.3 times of the length of the first empty foil area; the width of the groove is 0.1-0.3 times of the width of the first empty foil area.
Optionally, the area of the opposite side of the two protrusions is provided with a groove, the cross-sectional shape of the groove is a regular geometric shape, the groove is formed by cutting off the current collector and the active layer in the cross-sectional shape of the groove, and the length of the groove parallel to the current collector is 0.8-1.3 times of the width of the first empty foil area; the width of the groove is 0.1-0.3 times of the width of the first empty foil area.
Optionally, removing the active layer from a predetermined area of the second side surface of the current collector to form a second empty foil region having a third opening facing upward and a fourth opening perpendicular to the first side surface of the current collector; the orthographic projections of the second empty foil area and the first empty foil area on the surface of the current collector are overlapped.
According to the pole piece provided by the embodiment of the utility model, during welding, the distance between the pole piece and the empty foil area is controlled, so that the welding position between the pole piece and the empty foil area is a better welding position, the welding effect is improved, and the electrode lug is not easy to loosen;
in addition, the relative position of the welding seal on the tab in the empty foil area is limited, and the welding effect is further improved.
On the other hand, the embodiment of the utility model provides a still provide a battery, including foretell pole piece.
Drawings
Fig. 1 is an overall schematic view of a pole piece provided in a first embodiment of the present invention;
fig. 2 is a schematic half-sectional view of a pole piece according to a first embodiment of the present invention;
fig. 3 is a schematic view illustrating the matching between the current collector and the active layer of the pole piece according to the first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a welding print on a tab of a pole piece provided by the first embodiment of the present invention;
fig. 5 is a schematic diagram of a half-section structure of a pole piece according to a third embodiment of the present invention.
The reference numerals in the specification are as follows:
1. a current collector; 11. a first empty foil region; 111. performing arc transition; 12. a second empty foil region; 2. an active layer; 3. a tab; 4. welding and printing; 5. a protrusion; 6. and (4) a groove.
Detailed Description
In order to make the technical problem, technical solution and advantageous effects solved by the present invention more clearly understood, the following description is given in conjunction with the accompanying drawings and embodiments to further explain the present invention in detail. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
First embodiment
As shown in fig. 1 and fig. 2, a pole piece provided by a first embodiment of the present invention includes a current collector 1, an active layer 2, and a tab 3. The active layers 2 are respectively coated on the surfaces of the two sides of the current collector 1, and the active layers 2 are composed of active substances. Removing the active layer 2 in a predetermined area on the first side surface of the current collector 1 to form a blank foil area 11, namely cleaning the active layer 2 on the surface of the current collector 1 by using laser, so that the current collector 1 in the predetermined area is exposed, wherein the predetermined area is a first blank foil area 11, naturally, the first blank foil area 11 has an opening facing the vertical current collector 1, and the cleaning is firstly carried out from one side wall in the width direction of the current collector 1 to the other side wall, so that the first blank foil area 11 also has one side wall facing the width direction of the current collector 1, and the direction facing the side wall is defined to be upward, and at this time, the first blank foil area 11 has an opening facing upward.
The relative position of the both sides surface of mass flow body 1 sets up first empty foil district 11 and second empty foil district 12 respectively, and second empty foil district 12 sets up with first empty foil district 11 pairs, and second empty foil district 12 has third opening and fourth opening, and the third opening orientation is upwards, and the fourth opening orientation is opposite with the second opening orientation. In other words, the projections of the first and second empty foil areas 11 and 12 on both sides of the current collector 1 on the surface of the current collector 1 completely coincide. The tab 3 is welded to the current collector 1 in the first empty foil zone 11. The distance between the bottom edge of the tab 3 and the bottom wall of the first empty foil area 11 is defined as A, the value of A is 2-6mm, the side wall of one side of the tab 3 is defined as the right side, and the distance between the edge of the right side of the tab 3 and the side wall of the first empty foil area 11 is 0.1-0.2 times the width of the first empty foil area 11.
In the present embodiment, the first empty foil area 11 is rectangular, and more specifically, the length of the first empty foil area 11 is 15-30mm, the width of the first empty foil area 11 is 8-12mm, one end in the length direction of the first empty foil area 11 is an upper opening of the first empty foil area 11, the other end in the length direction of the first empty foil area 11 is a bottom wall of the first empty foil area 11, and both corner cross-sectional shapes of the bottom of the first empty foil area 11 are in arc transition 111. The diameter of the curved transition 111 is larger than the width of the first foil area 11. In the prior art, the waste material can be increased easily to the right angle corner, and this department is also wrinkled easily simultaneously, and the corner of arc transition 111 has increased the area of active layer 2 on the one hand, reduces the waste material, and on the other hand arc transition 111 is more smooth, is difficult to wrinkle.
Referring to fig. 3 and 4, in the present embodiment, the surface of the tab 3 away from the current collector 1 is provided with a weld 4, the distance between the bottom edge of the weld 4 and the bottom wall of the first empty foil region 11 is defined as B, and the value of B is 2.5-3mm; the distance between the upper edge of the pad 4 and the upper surface of the groove 5 is defined as D, and the value of D is 3-8mm. The distance between the bottom edge of the solder stamp 4 and the bottom surface of the projection 5 is defined as C, and the value of C is 1.5-2mm. After the welding is finished, a glue layer is attached to the surface of the solder print 4.
In the present embodiment, in order to increase the area of the active layer 2 and enhance the energy density of the pole piece, the active layer 2 extends towards both sides of the opening of the first empty foil area 11 to form the protrusions 5, respectively, and the upper edges of the protrusions 5 are flush with the upper surface of the current collector 1.
In this embodiment, a portion of the current collector 1 is cut along the thickness direction thereof to form a groove 6, the groove 6 is mainly used to avoid the occurrence of a short circuit phenomenon caused by the contact between the tab 3 and the active material of the active layer 2, and the groove 6 is located on one side of the upper opening of the first empty foil region 11 so that one side edge of the groove 6 is flush with the edge of one side of the width of the current collector 1; the groove 6 in this embodiment is rectangular, the length direction of the groove 6 is parallel to the length direction of the current collector 1, and the length of the groove 6 is 0.8-1.3 times of the length of the first empty foil area 11; the width of the groove 6 is 0.1-0.3 times the width of the first empty foil area 11.
Second embodiment
The pole piece of the second embodiment of the present invention is different from the first embodiment in that the areas of the opposite sides of the two protrusions 5 are provided with grooves 6, the cross-sectional shape of the grooves 6 is regular geometric shape, the grooves 6 are formed by cutting off the current collectors 1 and the active layers 2 in the cross-sectional shape, and the length of the grooves 6 parallel to the current collectors 1 is 0.8-1.3 times of the width of the first empty foil area 11; the width of the groove 6 is 0.1-0.3 times the width of the first empty foil area 11. The grooves 6 may be square, trapezoidal, etc. in this application to reduce contact of the tab 3 with the active layer 2 on the surface of the current collector 1.
Third embodiment
The pole piece of the third embodiment of the present invention is different from the first embodiment in that, as shown in fig. 5, the pole piece in this embodiment only has the first empty foil area 11, and the second side surface of the current collector 1 is not provided with the second empty foil area 12.
Fourth embodiment
The utility model discloses the fourth embodiment provides a battery, and this battery includes the pole piece that any above-mentioned embodiment described.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A pole piece is characterized by comprising a current collector, an active layer and a pole lug;
the active layers are coated on the surfaces of the two sides of the current collector;
removing the active layer from a predetermined area of the first side surface of the current collector to form a first empty foil region having a first opening facing upward and a second opening perpendicular to the first side surface of the current collector;
one end of the tab extends into the first empty foil area and is welded on the first side surface of the current collector, and the other end of the tab extends out of the first empty foil area; the distance between the bottom surface of the tab and the bottom wall of the first empty foil area is 2-6mm, and the distance between the right side surface of the tab and the right side wall of the first empty foil area is 0.1-0.2 times of the width of the first empty foil area.
2. The pole piece of claim 1, wherein the first empty foil area is rectangular, and both corners of the bottom of the first empty foil area are in arc transition; the diameter of the arc-shaped transition is larger than the width of the first empty foil area.
3. The pole piece of claim 2, wherein the first void foil zone has a length of 15-30mm and a width of 8-12mm.
4. The pole piece of any one of claims 2 to 3, wherein the active layer extends towards two sides of the opening of the first empty foil area to form a protrusion, respectively, the upper surface of the protrusion is flush with the upper surface of the current collector, and the tab protrudes out of the current collector from the opposite side of the two protrusions.
5. The pole piece of claim 4, wherein the area of the opposite side of the two protrusions is provided with a groove, the cross-sectional shape of the groove is a regular geometric shape, the groove is formed by cutting off the current collector and the active layer in the cross-sectional shape of the groove, and the length of the groove parallel to the current collector is 0.8-1.3 times of the width of the first empty foil area; the width of the groove is 0.1-0.3 times of the width of the first empty foil area.
6. The pole piece of claim 5, wherein the cross-sectional shape of the groove is rectangular, the groove is formed by cutting off the current collector and the active layer in the cross-sectional shape of the groove, and the length of the groove parallel to the current collector is 0.8-1.3 times the length of the first empty foil area; the width of the groove is 0.1-0.3 times of the width of the first empty foil area.
7. The pole piece according to claim 5, characterized in that the surface of the tab far away from the current collector is provided with a weld imprint, and the distance between the bottom edge of the weld imprint and the bottom wall of the first empty foil area is 2.5-3mm; the distance between the upper edge of the welding seal and the upper surface of the groove is 3-8mm; the distance between the bottom edge of the welding mark and the bottom surface of the bulge is 1.5-2mm.
8. The pole piece of claim 7, wherein the solder print is coated with an adhesive layer.
9. The pole piece of claim 1, wherein a predetermined area of the second side surface of the current collector is cleared of the active layer to form a second empty foil area having a third opening facing upward and a fourth opening perpendicular to the first side surface of the current collector; the orthographic projections of the second empty foil area and the first empty foil area on the surface of the current collector are overlapped.
10. A battery comprising a pole piece according to any one of claims 1 to 9.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222619243.6U CN218827228U (en) | 2022-09-29 | 2022-09-29 | Pole piece and battery |
| PCT/CN2023/120761 WO2024067403A1 (en) | 2022-09-29 | 2023-09-22 | Electrode plate and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222619243.6U CN218827228U (en) | 2022-09-29 | 2022-09-29 | Pole piece and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218827228U true CN218827228U (en) | 2023-04-07 |
Family
ID=87250836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222619243.6U Active CN218827228U (en) | 2022-09-29 | 2022-09-29 | Pole piece and battery |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN218827228U (en) |
| WO (1) | WO2024067403A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024067403A1 (en) * | 2022-09-29 | 2024-04-04 | 惠州市豪鹏科技有限公司 | Electrode plate and battery |
| WO2024113581A1 (en) * | 2022-11-30 | 2024-06-06 | 惠州亿纬锂能股份有限公司 | Lithium-ion battery positive electrode sheet, battery cell, and lithium-ion battery |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111527635A (en) * | 2017-12-25 | 2020-08-11 | 松下知识产权经营株式会社 | Secondary battery |
| CN112670436A (en) * | 2020-12-17 | 2021-04-16 | 惠州市豪鹏科技有限公司 | Preparation method of battery pole piece |
| CN214589165U (en) * | 2021-04-30 | 2021-11-02 | 珠海冠宇电池股份有限公司 | Battery cell and battery |
| CN215869464U (en) * | 2021-09-27 | 2022-02-18 | 珠海冠宇电池股份有限公司 | Pole piece assembly and battery |
| CN216288522U (en) * | 2021-11-18 | 2022-04-12 | 珠海冠宇电池股份有限公司 | Pole piece and battery |
| CN216354304U (en) * | 2021-12-06 | 2022-04-19 | 珠海冠宇电池股份有限公司 | Pole piece and battery |
| CN216435937U (en) * | 2021-12-07 | 2022-05-03 | 珠海冠宇电池股份有限公司 | Battery core and battery |
| CN218827228U (en) * | 2022-09-29 | 2023-04-07 | 惠州市豪鹏科技有限公司 | Pole piece and battery |
| CN218827233U (en) * | 2022-10-08 | 2023-04-07 | 惠州市豪鹏科技有限公司 | Pole piece and battery |
-
2022
- 2022-09-29 CN CN202222619243.6U patent/CN218827228U/en active Active
-
2023
- 2023-09-22 WO PCT/CN2023/120761 patent/WO2024067403A1/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024067403A1 (en) * | 2022-09-29 | 2024-04-04 | 惠州市豪鹏科技有限公司 | Electrode plate and battery |
| WO2024113581A1 (en) * | 2022-11-30 | 2024-06-06 | 惠州亿纬锂能股份有限公司 | Lithium-ion battery positive electrode sheet, battery cell, and lithium-ion battery |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024067403A1 (en) | 2024-04-04 |
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