CN114335919B - Square metal shell lithium ion battery and assembly process thereof - Google Patents
Square metal shell lithium ion battery and assembly process thereof Download PDFInfo
- Publication number
- CN114335919B CN114335919B CN202111576231.3A CN202111576231A CN114335919B CN 114335919 B CN114335919 B CN 114335919B CN 202111576231 A CN202111576231 A CN 202111576231A CN 114335919 B CN114335919 B CN 114335919B
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- China
- Prior art keywords
- welding
- cover plate
- metal shell
- shell
- negative electrode
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- 229910052751 metal Inorganic materials 0.000 title claims abstract description 61
- 239000002184 metal Substances 0.000 title claims abstract description 61
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 33
- 238000000034 method Methods 0.000 title claims abstract description 22
- 229910000838 Al alloy Inorganic materials 0.000 claims abstract description 6
- 229910000640 Fe alloy Inorganic materials 0.000 claims abstract description 5
- 238000003466 welding Methods 0.000 claims description 98
- 238000007493 shaping process Methods 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 6
- 230000035515 penetration Effects 0.000 claims description 3
- 229920002799 BoPET Polymers 0.000 description 2
- 239000005041 Mylar™ Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 229910001021 Ferroalloy Inorganic materials 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 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
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Secondary Cells (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The invention relates to a square metal shell lithium ion battery and an assembly process thereof, wherein a metal shell of the square metal shell lithium ion battery is an aluminum alloy shell or an iron alloy shell, a positive electrode cover plate or a negative electrode cover plate of the lithium ion battery is provided with a pole post with a stamping boss, a positive electrode tab or a negative electrode tab of the lithium ion battery is welded on the inner wall of a metal shell through a connecting sheet, in the assembly process, the tab is welded with the metal shell through the connecting sheet, the metal shell is connected with the cover plate, and then the connecting sheet is connected with the pole post, so that the assembly process of the high-aspect ratio battery is simplified.
Description
Technical Field
The invention belongs to the technical field of lithium ion batteries, and particularly relates to a square metal shell lithium ion battery and an assembly process thereof.
Background
The lithium ion battery has the characteristic advantages of being widely applied in the field of new energy, along with the development of new energy automobiles, the requirements on the energy density and the safety of the lithium ion battery are higher and higher, and the lithium ion battery has the advantages in the aspects of the energy density and the safety for batteries with high length-width ratios.
The high aspect ratio battery is generally provided with a tab at the opposite side, a positive cover plate and a negative cover plate, and the existing assembly process is mainly provided with two types, wherein one type is that a core package and a negative cover plate are welded together, a longer connecting sheet is welded to a positive tab, the core package and the negative cover plate are shaped through a Mylar film, and then the core package and the negative cover plate are put into a shell, and then the positive connecting sheet and the positive cover plate are welded; another assembling process is to weld the core package with the anode and cathode cover plates, then shape the core package with the anode and cathode cover plates by using a Mylar film, and then put the core package into the shell. The first assembly process is characterized in that the core package is welded with the anode cover plate after the core package is put into the shell, and a longer connecting sheet is required to be welded, so that the space utilization rate of the battery core is low, the connecting sheet is generally in soft connection, and the cost is high. The second assembly process is that the anode cover plate and the cathode cover plate are welded with the core package and then are put into the shell, so that the size of the core package needs to be strictly controlled, the precision requirement of equipment is high, and the process is generally difficult to achieve.
Disclosure of Invention
The invention aims to provide a square metal shell lithium ion battery and an assembly process thereof, which simplify the assembly process of the battery with high length-width ratio, reduce the cost and realize the control of the internal temperature of the battery.
The invention solves the problems by adopting the following technical scheme: the square metal shell lithium ion battery is characterized in that the metal shell is an aluminum alloy shell or an iron alloy shell, a positive electrode cover plate or a negative electrode cover plate of the lithium ion battery is provided with a pole column with a stamping boss, and a positive electrode lug or a negative electrode lug of the lithium ion battery is welded on the inner wall of a shell of the metal shell through a connecting sheet.
An assembly process of a square metal shell lithium ion battery, wherein the metal shell is an aluminum alloy shell, and comprises the following steps:
(1) Welding a negative electrode cover plate: welding the negative electrode lug of the core package with a negative electrode cover plate;
(2) Welding an anode connecting sheet: welding the positive electrode tab of the core pack with the positive electrode connecting sheet;
(3) Positive electrode insulation: the positive electrode lug is protected by an insulating bracket;
(4) Shaping: fixing the core package, the negative electrode cover plate and the positive electrode insulating bracket together by adopting an insulating film;
(5) And (3) shell entering: the core bag after the shaping in the step (4) is put into the metal shell from the positive side;
(6) The negative electrode cover plate is welded with the shell: welding the metal shell with the negative electrode cover plate through top welding or side welding;
(7) And (3) positive electrode confluence welding: welding the positive electrode connecting sheet with the inner wall of the shell of the metal shell through penetration welding;
(8) Welding an anode cover plate: the positive cover plate and the metal shell are welded together by top welding or side welding through laser welding.
Preferably, the welding mode in the step (1) is laser welding, the welding mode in the step (2) is laser or ultrasonic welding, the welding mode in the step (6) is laser welding, and the welding mode in the step (7) is laser welding.
An assembly process of a square metal shell lithium ion battery, wherein the metal shell is an iron alloy shell, and comprises the following steps:
(1) Welding an anode cover plate: welding the positive electrode lug of the core package with the positive electrode cover plate;
(2) Welding a negative electrode connecting sheet: welding the negative electrode tab of the core package with the negative electrode connecting sheet;
(3) Negative electrode insulation: the negative electrode lug is protected by an insulating bracket;
(4) Shaping: fixing the core package, the anode cover plate and the cathode insulating bracket together by adopting an insulating film;
(5) And (3) shell entering: the core bag after the shaping in the step (4) is taken into the metal shell from the negative side;
(6) The positive electrode cover plate is welded with the shell: welding the metal shell with the anode cover plate through top welding or side welding;
(7) Welding the cathode confluence: welding the negative electrode connecting sheet and the inner wall of the metal shell through laser or spot welding;
(8) Welding a negative electrode cover plate: the positive cover plate and the metal shell are welded together by top welding or side welding.
Preferably, the welding mode in the step (1) is laser welding, the welding mode in the step (2) is laser, ultrasonic welding or spot welding, the welding mode in the step (6) is laser welding, and the welding mode in the step (7) is laser welding.
Compared with the prior art, the invention has the advantages that:
in the prior art, the pole and the cover plate are required to be insulated and sealed, the processing procedure is complicated, the cost is high, and certain hidden danger exists, the stamping boss is arranged on the positive electrode cover plate or the negative electrode cover plate as the pole, so that the processing procedure of the pole is simple, a sealing ring and an insulating pad are omitted, the cost is low, the pole lug is welded with the metal shell through the connecting sheet, the metal shell is connected with the cover plate, the connecting sheet is further connected with the pole, the assembly process of the high-aspect ratio battery is simplified, and the heat inside the battery can be quickly transferred to the shell through the pole lug because the positive electrode or the negative electrode of the battery is directly conducted with the shell, and the control of the internal temperature of the battery can be better realized.
Drawings
Fig. 1 is a schematic structural diagram of a positive electrode cover plate in embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of a negative electrode cap plate in embodiment 2 of the present invention.
Wherein 1 is positive electrode cover plate, 2 is positive electrode post, 3 is negative electrode cover plate, and 4 is negative electrode post.
Detailed Description
The present invention is described in further detail below with reference to examples.
Example 1
As shown in fig. 1, the structure of the positive electrode cover plate in embodiment 1 of the present invention is schematically shown.
A square metal casing lithium ion battery, the metal casing is the aluminum alloy shell, be equipped with the positive pole post of punching press boss on lithium ion battery's the positive pole apron, lithium ion battery's positive pole tab is welded on metal casing's shells inner wall through the connection piece.
An assembly process of a square metal shell lithium ion battery, wherein the metal shell is an aluminum alloy shell, and comprises the following steps:
(1) Welding a negative electrode cover plate: laser welding the cathode tab of the core package with the cathode cover plate;
(2) Welding an anode connecting sheet: laser welding the positive electrode tab of the core package and the positive electrode connecting sheet;
(3) Positive electrode insulation: the positive electrode lug is protected by an insulating bracket;
(4) Shaping: fixing the core package, the negative electrode cover plate and the positive electrode insulating bracket together by adopting an insulating film;
(5) And (3) shell entering: the core bag after the shaping in the step (4) is put into the metal shell from the positive side;
(6) The negative electrode cover plate is welded with the shell: laser welding the metal shell and the negative electrode cover plate through top welding or side welding;
(7) And (3) positive electrode confluence welding: laser welding the positive electrode connecting sheet and the inner wall of the shell of the metal shell through penetration welding;
(8) Welding an anode cover plate: and welding the anode cover plate and the metal shell together through top welding and side welding and laser welding.
Example 2
As shown in fig. 2, the structure of the anode cover plate in embodiment 2 of the present invention is schematically shown.
The utility model provides a square metal casing lithium ion battery, metal casing ferroalloy shell, be equipped with the negative pole utmost point post of punching press boss on lithium ion battery's the negative pole apron, lithium ion battery's negative pole utmost point ear is welded on metal casing's shells inner wall through the connection piece.
An assembly process of a square metal shell lithium ion battery, wherein the metal shell is an iron alloy shell, and comprises the following steps:
(1) Welding an anode cover plate: laser welding the positive electrode lug of the core package and the positive electrode cover plate;
(2) Welding a negative electrode connecting sheet: laser welding the cathode tab of the core package and the cathode connecting sheet;
(3) Negative electrode insulation: the negative electrode lug is protected by an insulating bracket;
(4) Shaping: fixing the core package, the anode cover plate and the cathode insulating bracket together by adopting an insulating film;
(5) And (3) shell entering: the core bag after the shaping in the step (4) is taken into the metal shell from the negative side;
(6) The positive electrode cover plate is welded with the shell: laser welding the metal shell and the anode cover plate through top welding or side welding;
(7) Welding the cathode confluence: the negative electrode connecting sheet and the inner wall of the shell of the metal shell are welded together by laser or spot welding;
(8) Welding a negative electrode cover plate: the positive cover plate and the metal shell are welded together by top welding or side welding.
In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions that are formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.
Claims (2)
1. A square metal casing lithium ion battery, its characterized in that: the metal shell is an aluminum alloy shell, a positive pole post of a stamping boss is arranged on a positive pole cover plate of the lithium ion battery, and a positive pole lug of the lithium ion battery is welded on the inner wall of a shell of the metal shell through a connecting sheet;
the square metal shell lithium ion battery is assembled by the following assembly process, and comprises the following steps:
(1) Welding a negative electrode cover plate: laser welding the cathode tab of the core package with the cathode cover plate;
(2) Welding an anode connecting sheet: laser welding the positive electrode tab of the core package and the positive electrode connecting sheet;
(3) Positive electrode insulation: the positive electrode lug is protected by an insulating bracket;
(4) Shaping: fixing the core package, the negative electrode cover plate and the positive electrode insulating bracket together by adopting an insulating film;
(5) And (3) shell entering: the core bag after the shaping in the step (4) is put into the metal shell from the positive side;
(6) The negative electrode cover plate is welded with the shell: laser welding the metal shell and the negative electrode cover plate through top welding or side welding;
(7) And (3) positive electrode confluence welding: laser welding the positive electrode connecting sheet and the inner wall of the shell of the metal shell through penetration welding;
(8) Welding an anode cover plate: and welding the anode cover plate and the metal shell together through top welding and side welding and laser welding.
2. A square metal casing lithium ion battery, its characterized in that: the metal shell is made of iron alloy, a negative electrode cover plate of the lithium ion battery is provided with a negative electrode post with a stamping boss, and a negative electrode lug of the lithium ion battery is welded on the inner wall of a shell of the metal shell through a connecting sheet;
the square metal shell lithium ion battery is assembled by the following assembly process, and comprises the following steps:
(1) Welding an anode cover plate: laser welding the positive electrode lug of the core package and the positive electrode cover plate;
(2) Welding a negative electrode connecting sheet: laser welding the cathode tab of the core package and the cathode connecting sheet;
(3) Negative electrode insulation: the negative electrode lug is protected by an insulating bracket;
(4) Shaping: fixing the core package, the anode cover plate and the cathode insulating bracket together by adopting an insulating film;
(5) And (3) shell entering: the core bag after the shaping in the step (4) is taken into the metal shell from the negative side;
(6) The positive electrode cover plate is welded with the shell: laser welding the metal shell and the anode cover plate through top welding or side welding;
(7) Welding the cathode confluence: the negative electrode connecting sheet and the inner wall of the shell of the metal shell are welded together by laser or spot welding;
(8) Welding a negative electrode cover plate: the positive cover plate and the metal shell are welded together by top welding or side welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111576231.3A CN114335919B (en) | 2021-12-22 | 2021-12-22 | Square metal shell lithium ion battery and assembly process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111576231.3A CN114335919B (en) | 2021-12-22 | 2021-12-22 | Square metal shell lithium ion battery and assembly process thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114335919A CN114335919A (en) | 2022-04-12 |
| CN114335919B true CN114335919B (en) | 2024-03-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111576231.3A Active CN114335919B (en) | 2021-12-22 | 2021-12-22 | Square metal shell lithium ion battery and assembly process thereof |
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2021
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| Publication number | Publication date |
|---|---|
| CN114335919A (en) | 2022-04-12 |
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