CN215342666U - Welding-through-preventing lithium battery end sealing structure - Google Patents
Welding-through-preventing lithium battery end sealing structure Download PDFInfo
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- CN215342666U CN215342666U CN202121202123.5U CN202121202123U CN215342666U CN 215342666 U CN215342666 U CN 215342666U CN 202121202123 U CN202121202123 U CN 202121202123U CN 215342666 U CN215342666 U CN 215342666U
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- welding
- current collector
- sealing structure
- lithium battery
- shell
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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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- 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
Abstract
The utility model discloses a welding-through prevention lithium battery end sealing structure, which comprises a shell, an electric core, electrolyte, a current collecting piece and the like, wherein the current collecting piece is additionally arranged outside the current collecting piece, and the current collecting piece are in circumferential sealing connection, so that a plurality of welding spots on the current collecting piece are sealed and sealed together; therefore, when the electrolyte in the shell leaks from the welding position due to accidental welding penetration of welding points on the current collecting piece, the leaked electrolyte can be prevented from completely seeping out of the shell through the blocking of the current collecting piece, and the potential safety hazard of the use of the battery is eliminated; meanwhile, the anti-welding-through end sealing structure can be suitable for the positive end and the negative end of a lithium battery, and the explosion-proof valves of the positive end and the negative end can be directly arranged on the current collectors through the additionally arranged current collectors, so that the trouble that the explosion-proof valves are required to be arranged in the middle holes of the positive end of the traditional lithium battery is avoided; in addition, the end sealing structure can be applied to various structural forms of a positive electrode end or a negative electrode end, and the application range is very wide.
Description
Technical Field
The utility model relates to a sealing structure for an end part of a lithium battery, in particular to a sealing structure for an end part of a lithium battery preventing welding penetration.
Background
At present, the end part sealing is required in the production and manufacturing process of the lithium battery, and particularly, the end part of a shell is hermetically installed through a current collecting piece so as to hermetically seal a battery core and electrolyte in the shell; meanwhile, the current collecting piece is welded with the battery core for conducting electricity; thus, after welding, a plurality of welding points are formed on the current collecting sheet. However, since the current collecting plate is only a thin metal plate with a thickness almost equal to that of the case, during the conductive welding process with the battery core, the accidental welding of the welding spot is very easy to occur, and then the electrolyte in the case leaks and seeps out from the welding spot, and the exterior of the current collecting plate only plays a role of decoration and covering even if the insulation cover is arranged, and obviously the leaked electrolyte cannot be sealed, which brings great potential safety hazard to the use of the battery.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the defects of the prior art and provide a welding-through preventing lithium battery end sealing structure which can not cause electrolyte in a shell to leak and seep even if welding spots on a current collecting piece are welded through accidentally.
The technical problem of the utility model is realized by the following technical scheme:
the utility model provides a prevent welding and wear lithium cell tip sealing structure, includes electric core and electrolyte in shell, the shell to and the sealed current collector piece of installing at the shell tip, this current collector piece will electric core and electrolyte seal form a plurality of solder joint on the current collector piece in the shell, and by a plurality of solder joint constitutes electric core and current collector piece between the welding electrically conductive, the current collector piece be equipped with the mass flow body outward, circumference sealing connection between this mass flow body and the current collector piece, and will including a plurality of solder joint seals jointly.
The middle part of the current collector is provided with a boss which protrudes outwards along the axial lead of the shell.
The boss is internally provided with a middle hole which penetrates through along the axial lead, and the middle hole is internally provided with a cover cap which covers and seals the middle hole.
The lower end of the cap is provided with a flange which is turned upwards in the circumferential direction, and the cap is assembled in the middle hole through the flange.
The cap is externally provided with a cover ring which is sleeved and installed, and the cover ring covers the joint of the flanging and the middle hole.
The lug boss is a totally-enclosed lug boss which is connected with the middle part of the current collector and protrudes upwards.
The outer edge of the current collector is provided with a hem which is turned upwards in the circumferential direction, the hem and the current collecting piece are sealed in a circumferential welding mode, and the plurality of welding spots are sealed and sealed together.
The outer edge of the flow collecting piece is provided with a bent edge which is turned upwards along the circumference, a sealing ring which is installed in a sealing mode is arranged between the bent edge and the end portion of the shell, or the bent edge is directly welded and sealed with the end portion of the shell in the circumference mode.
The collector plate is a connected bottom plate formed by pressing and inwards recessing the end part of the totally-enclosed shell.
The end part of the shell is provided with an insulating cover for covering the current collector, and the insulating cover is provided with a cover hole for the lug boss to extend out of the exposed part.
Compared with the prior art, the utility model is mainly characterized in that the current collector is additionally arranged outside the current collector sheet, and the current collector sheet are in circumferential sealing connection, so that a plurality of welding spots on the current collector sheet can be sealed and sealed together; therefore, when the electrolyte in the shell leaks from the welding position due to accidental welding penetration of welding points on the current collecting pieces, the leaked electrolyte cannot completely seep out of the shell due to the fact that the current collecting piece is arranged to block, and therefore the potential safety hazard problem of battery use is effectively solved; meanwhile, the anti-welding-through end sealing structure can be suitable for the positive end and the negative end of a lithium battery, and as a layer of current collectors which are connected in a circumferential sealing manner is additionally arranged, anti-explosion valves can be arranged on the current collectors at the positive end and the negative end, so that the trouble that the anti-explosion valves are required to be arranged in the middle holes at the positive end of the traditional lithium battery is avoided; in addition, the end sealing structure can be applied to various structural forms of a positive electrode end or a negative electrode end, and the application range is very wide.
Drawings
Fig. 1 is a schematic sectional structure of the present invention.
Fig. 2 is an enlarged sectional view of the positive terminal to which the present invention is applied.
Fig. 3 is an enlarged cross-sectional view of a first structural form of the negative terminal according to the present invention.
Fig. 4 is an enlarged cross-sectional view of a second structural form of the negative terminal according to the present invention.
Fig. 5 is an enlarged sectional view of a third structural form of the negative terminal according to the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the above drawings.
As shown in fig. 1 to 5, 1 is a shell, 11 is a battery core, 12 is a rolling groove, 2 is an insulating ring, 3 is a sealing ring, 4 is a support ring, 5 is an insulating cover, 6 is a cover cap, 61 is a flanging, 7 is a cover ring, 8 is a current collector, 81 is a flanging, 82 is a boss, 83 is a middle hole, 9 is a current collecting piece, 91 is a flanging, and 10 is a welding point.
A welding penetration preventing end sealing structure of a lithium battery is shown in figure 1 and mainly relates to an end sealing structure which can ensure that leaked electrolyte cannot completely seep out of a shell 1 through a protection when electrolyte in the shell 1 leaks from a welding penetration position due to accidental welding penetration of a welding point 10 on a current collecting piece 9; moreover, the end sealing structure is applicable to various structural forms of a positive electrode end or a negative electrode end of a lithium battery, and the application range is very wide.
The end sealing structure generally comprises a shell 1, a battery cell 2 and electrolyte in the shell, a current collector plate 9 and the like, wherein the current collector plate 9 is hermetically installed at the end of the shell 1, the battery cell 2 and the electrolyte are hermetically sealed in the shell 1 by the current collector plate, a plurality of welding spots 10 are formed on the current collector plate 9, and the welding between the battery cell 2 and the current collector plate 9 is formed by the plurality of welding spots.
The battery case 1 is made of steel or aluminum, and has a cylindrical or square shape, the cylindrical case is used as an example in the embodiment, after the battery cell 2 is arranged in the case, the end of the lithium battery is sealed by the round current collector 9, so that the battery cell 2 is sealed in the case 1, and then the case is filled with the electrolyte, so that the battery cell 2 and the electrolyte are sealed and sealed in the case 1.
The sealing structure of the current collecting piece 9 at the end of the lithium battery has various structural forms, and in this embodiment, four sealing structure forms will be exemplified, wherein as shown in fig. 2, the positive electrode end sealing structure is firstly provided with a bent edge 91 which is vertically folded upwards along the circumference at the outer edge of the current collecting piece 9, then a sealing ring 3 is arranged between the bent edge and the end of the housing 1 to form sealing installation, and the upper part and the lower part of the sealing ring are respectively provided with a support ring 4 and an insulating ring 2 to enhance the sealing performance; the negative electrode terminal sealing structure is shown in fig. 3 to 5, wherein the first structural form is the same as the positive electrode terminal as shown in fig. 3, and therefore, the description is not repeated here; the second structure is shown in fig. 4, and a bending edge 91 which is vertically folded upwards in the circumferential direction is also arranged on the outer edge of the current collecting plate 9, and the bending edge is directly welded and sealed with the end part of the shell 1 in the circumferential direction; the third structure is shown in fig. 5, which is a connected negative plate formed by pressing and recessing the end part of the totally-enclosed shell 1 inwards, namely a current collecting plate 9 with a connected structure.
A circular current collector 8 is arranged outside the current collecting piece 9, a folding edge 81 which is upwards folded in the circumferential direction is arranged on the outer edge of the current collector, circumferential welding sealing is carried out between the folding edge and the current collecting piece 9, and a plurality of welding spots 10 are sealed and sealed together; the middle part of the current collector 8 is provided with a boss 82 which is a cylindrical table protruding outwards along the axial lead of the shell.
Meanwhile, according to the design structure difference of the positive terminal and the negative terminal of the lithium battery, a middle hole 83 which penetrates through along the axial lead as shown in fig. 2 is arranged in the current collector boss 82 positioned at the positive terminal, a cap 6 which covers and seals the middle hole 83 is arranged in the middle hole, and the specific structure is as follows: the lower end of the cap 6 is provided with a flange 61 which is turned upwards in the circumferential direction, the cap is assembled in the central hole 83 through flange matching, a cover ring 7 which is assembled in a sleeving manner is arranged outside the cap 6, and the joint of the flange 61 and the central hole 83 is covered by the cover ring to realize gap sealing.
The current collector boss at the negative end is a totally-enclosed boss which is integrally and upwardly protruded in the middle of the current collector 8 as shown in fig. 3-5.
When the current collecting plate 9 and the current collecting body 8 are welded and sealed firmly, the end of the casing 1 is further provided with an insulating cover 5 to cover the current collecting body 8, so that the end appearance is attractive, and a cover supplying hole is required to be formed in the insulating cover 5 to allow the boss 82 to extend out and expose.
The utility model has double protection functions aiming at accidental welding penetration of the welding spots 10, when electrolyte in the shell 1 leaks from the welding penetration position due to accidental welding penetration of the welding spots 10 on the current collecting plate 9, the leaked electrolyte cannot completely seep out of the shell 1 due to blocking of the current collecting body 8, thereby effectively solving the potential safety hazard problem of battery use.
In addition, because the current collector 8 which is connected in a circumferential sealing manner is creatively added to the end sealing structure for preventing welding penetration, the explosion-proof valves can be arranged on the current collectors at the positive end and the negative end, and the trouble that the explosion-proof valves are required to be arranged in the middle hole 83 at the positive end of the traditional lithium battery is avoided.
When the end sealing structure of the present invention is applied, the manufacturing methods of the positive terminal and the negative terminal are different, for example, the manufacturing method of the end sealing structure of the positive terminal includes the following steps:
firstly, assembling a battery cell 11 into an inner hole of a shell 1;
secondly, an insulating ring 2 is arranged in an inner hole of the shell 1, a rolling groove 12 which is circumferentially surrounded is arranged, and the inner wall of the rolling groove presses the insulating ring 2 to fix the battery core 11;
thirdly, the sealing ring 3 and the current collecting piece 9 are assembled into a whole and then are arranged in the inner hole of the shell 1 together, and are positioned above the battery cell 11 to be pressed and contacted with the battery cell 11;
welding and conducting the current collecting piece 9 and a positive electrode lug of the battery cell 11 to form a plurality of welding spots 10 on the current collecting piece 9;
fifthly, the current collector 8 with the boss 82 is arranged outside the current collecting piece 9, and is circumferentially welded with the current collecting piece to seal and seal a plurality of welding spots 10 together, and a middle hole 83 penetrating along the axial lead is formed in the boss 82;
sixthly, the cap 6 is placed in the middle hole 83 and is welded and fixed with the current collector 8 to cover and close the middle hole 83, and the welding position is covered by a cover ring 7 which is installed outside the cap 6 in a sleeved mode to achieve gap sealing;
the insulating cover 5 covers the current collector 8, and the insulating cover 5 is pressed through a rolling opening at the positive end of the shell;
and a support ring 4 is arranged between the scroll port and the insulating cover 5 for further sealing.
The manufacturing method of the end sealing structure of the negative end comprises the following steps:
firstly, after an electric core 11 is installed in an inner hole of a shell 1, a current collecting sheet 9 is sealed in the shell 1, the sealing structure is designed into three types, and the first structural form is the same as that of an anode end; the second structure is that the outer edge of the current collecting piece 9 is provided with a bending edge 91 which is vertically folded upwards in the circumferential direction, and the bending edge is directly welded and sealed with the end part of the shell in the circumferential direction; the third structure mode is that the collector plate 9 is pressed inwards from the totally closed end part of the shell to be concave inwards to form a connected bottom plate;
welding the current collecting sheet 9 and the negative electrode lug of the battery cell 11 for electric conduction, so that a plurality of welding spots 10 are formed on the current collecting sheet 9;
thirdly, the current collector 8 with the totally-enclosed boss 82 is arranged outside the current collecting piece 9 and is circumferentially welded with the current collecting piece, so that the welding spots 10 are sealed and enclosed together;
fourth, insulating cover 5 covers current collector 8.
The above description is only a specific embodiment of the present invention, and those skilled in the art should understand that any similar structural design to the embodiment is included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a prevent welding and wear lithium cell tip sealing structure, electric core (11) and electrolyte in shell (1), the shell to and seal installation current collector piece (9) at shell (1) tip, this current collector piece will electric core (11) and electrolyte seal enclose in the shell, form a plurality of solder joint (10) on current collector piece (9), and by a plurality of solder joint constitutes electric core (11) and current collector piece (9) between the welding electrically conductive, its characterized in that current collector piece (9) be equipped with mass flow body (8) outward, circumference sealing connection between this mass flow body and current collector piece (9), and will including a plurality of solder joint (10) seal jointly.
2. The end sealing structure of the lithium battery for preventing welding penetration according to claim 1, wherein the current collector (8) is provided with a boss (82) at the middle part, and the boss protrudes outwards along the axial lead of the shell (1).
3. The end sealing structure of the lithium battery for preventing welding penetration as claimed in claim 2, wherein a central hole (83) penetrating along the axial lead is arranged in the boss (82), and a cap (6) covering and closing the central hole is arranged in the central hole.
4. A weld-through preventing end closure structure for lithium batteries according to claim 3, characterized in that the lower end of the cap (6) is provided with a flange (61) turned over circumferentially upwards, and the cap is fitted in the central hole (83) through the flange (61).
5. The end sealing structure of the lithium battery for preventing welding penetration according to claim 4, characterized in that a cover ring (7) is sleeved outside the cap (6) and covers the joint of the flanging (61) and the middle hole (83).
6. The end sealing structure of the lithium battery for preventing welding penetration according to claim 2, characterized in that the boss (82) is a totally-enclosed boss which is integrally and upwardly protruded in the middle of the current collector (8).
7. The end sealing structure of the lithium battery of claim 1, characterized in that the current collector (8) has a flange (81) at its outer edge, which is turned upwards, and the flange and the current collector (9) are sealed by circumferential welding, and the welding points (10) are sealed and sealed together.
8. The end sealing structure of the lithium battery of claim 1, characterized in that the outer edge of the current collector (9) is provided with a bead (91) turned upwards circumferentially, a sealing ring (3) forming a sealing installation is arranged between the bead and the end of the housing (1), or the bead (91) is directly welded and sealed circumferentially with the end of the housing.
9. The end sealing structure of the lithium battery of claim 1, characterized in that the current collecting plate (9) is a connected negative plate formed by pressing and recessing the end of the totally-enclosed casing (1) inwards.
10. The end sealing structure of the lithium battery of claim 2, characterized in that the end of the casing (1) is provided with an insulating cover (5) covering the current collector (8), and the insulating cover is provided with a cover hole for the projection (82) to protrude and expose.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121202123.5U CN215342666U (en) | 2021-06-01 | 2021-06-01 | Welding-through-preventing lithium battery end sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121202123.5U CN215342666U (en) | 2021-06-01 | 2021-06-01 | Welding-through-preventing lithium battery end sealing structure |
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| Publication Number | Publication Date |
|---|---|
| CN215342666U true CN215342666U (en) | 2021-12-28 |
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| CN202121202123.5U Active CN215342666U (en) | 2021-06-01 | 2021-06-01 | Welding-through-preventing lithium battery end sealing structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024014939A1 (en) * | 2022-07-15 | 2024-01-18 | 주식회사 엘지에너지솔루션 | Cylindrical battery cell, and battery pack and vehicle including same |
| WO2024019592A1 (en) * | 2022-07-21 | 2024-01-25 | 주식회사 엘지에너지솔루션 | Fixing structure of electrode terminal, and battery, battery pack and vehicle including same |
-
2021
- 2021-06-01 CN CN202121202123.5U patent/CN215342666U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024014939A1 (en) * | 2022-07-15 | 2024-01-18 | 주식회사 엘지에너지솔루션 | Cylindrical battery cell, and battery pack and vehicle including same |
| WO2024019592A1 (en) * | 2022-07-21 | 2024-01-25 | 주식회사 엘지에너지솔루션 | Fixing structure of electrode terminal, and battery, battery pack and vehicle including same |
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