CN215496875U - Lithium battery sealing structure - Google Patents
Lithium battery sealing structure Download PDFInfo
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- CN215496875U CN215496875U CN202121703449.6U CN202121703449U CN215496875U CN 215496875 U CN215496875 U CN 215496875U CN 202121703449 U CN202121703449 U CN 202121703449U CN 215496875 U CN215496875 U CN 215496875U
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- rivet
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- contact surface
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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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- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model relates to the technical field of batteries and discloses a lithium battery sealing structure.A step structure is arranged at an opening of a battery shell along the circumferential direction and comprises a first contact surface and a second contact surface; the cap component comprises a rivet, a sealing piece and a substrate, the end face of the substrate is attached to the first contact surface, and the bottom face of the substrate is attached to the second contact surface. The base plate is welded with the first contact surface and the second contact surface through a laser welding process, so that the base plate is hermetically connected with the battery shell, the welding contact area of the base plate and the battery shell is large, the welding is firm, and the sealing effect is good. The sealing element is connected between the rivet and the substrate in a sealing manner, so that the sealing of the battery cell is realized, and the electrolyte can be prevented from leaking through a gap between the rivet and the substrate. The utility model has the advantages of no need of bending the battery shell, simple processing technology, simplified production process, no damage to the coating of the battery shell and avoidance of electrolyte leakage caused by corrosion and rust of the battery shell.
Description
Technical Field
The utility model relates to the technical field of batteries, in particular to a lithium battery sealing structure.
Background
Cylindrical lithium batteries generally include a housing, a cap, a positive electrode, a negative electrode, a separator, and an electrolyte inside the housing. The sealing ring is arranged between the shell and the terminal, and the sealing ring is deformed to realize sealing through physical extrusion of the shell. The terminal is a combined piece consisting of a top cover, an explosion-proof sheet, a sealing ring, a pore plate gasket and a pore plate. According to the sealing method, when the lithium battery is sealed, the shell is required to be subjected to rolling groove processing, then the terminal is placed in the shell, the outer diameter of the terminal is in clearance fit with the inner diameter of the shell, and the rolling groove plays a role in fixing the terminal in the vertical direction. Finally, the opening of the shell is turned inwards, and the opening and the terminal jointly act to extrude the sealing ring to complete sealing.
The battery sealing method has the defects that the housing needs to be subjected to roll groove preprocessing before the battery is sealed, and a plating layer of the battery housing is easy to fall off during roll groove processing, so that the housing is corroded and rusted by electrolyte, and the risk of electrolyte leakage is caused.
SUMMERY OF THE UTILITY MODEL
In view of the above problems, an object of the present invention is to provide a sealing structure for a lithium battery, which does not require a roll groove process for a battery case, and can ensure a sealing effect of the battery and prevent leakage of an electrolyte.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a lithium battery sealing structure comprising:
the battery comprises a battery shell, wherein a step structure is arranged at an opening of the battery shell along the circumferential direction, and the step structure comprises a first contact surface and a second contact surface;
the nut cap assembly comprises a rivet, a sealing element and a substrate, wherein the rivet penetrates through the substrate and is connected with a pole lug in the battery shell, the sealing element is connected between the rivet and the substrate in a sealing mode, the end face of the substrate is attached to the first contact surface, the bottom face of the substrate is attached to the second contact surface, and the substrate is sealed with the first contact surface and the second contact surface in a welding mode.
As a preferable scheme of the lithium battery sealing structure of the present invention, the sealing element includes a T-shaped sealing ring sleeved on the rivet, a T-shaped head of the T-shaped sealing ring abuts against a side of the substrate facing the inner cavity of the battery case, and an end surface of one end of the T-shaped sealing ring away from the T-shaped head is flush with a side of the substrate facing away from the inner cavity of the battery case.
As a preferable scheme of the lithium battery sealing structure of the present invention, the substrate is provided with a mounting hole, the T-shaped sealing ring is located in the mounting hole, and the rivet can press the T-shaped sealing ring against the hole wall of the mounting hole.
As a preferable scheme of the lithium battery sealing structure of the present invention, the rivet has a solid structure.
As a preferable scheme of the sealing structure of the lithium battery, the cap assembly further includes an insulating gasket, the insulating gasket is covered on one side of the substrate, which faces away from the inner cavity of the battery shell, and the rivet penetrates through the insulating gasket.
As a preferable scheme of the lithium battery sealing structure of the present invention, the cap assembly further includes a pressing plate, the pressing plate is covered on the insulating gasket, and the rivet sequentially penetrates through the pressing plate, the insulating gasket, and the substrate.
As a preferable scheme of the lithium battery sealing structure of the present invention, the pressure plate is concavely provided with an accommodating groove, and a head of the rivet body of the rivet is located in the accommodating groove.
As the preferable scheme of the lithium battery sealing structure, the rivet, the pressing plate and the lug are all made of copper materials.
As a preferred scheme of the lithium battery sealing structure of the present invention, an upper gasket is disposed in the battery case, a winding core is disposed in the battery case and filled with an electrolyte, and the upper gasket is located at a top end of the winding core.
As a preferable aspect of the lithium battery sealing structure of the present invention, a lower gasket is disposed at the bottom of the battery case, and the lower gasket is sandwiched between the winding core and the bottom wall of the battery case.
The utility model has the beneficial effects that:
according to the lithium battery sealing structure provided by the utility model, the stepped structure is arranged at the opening of the battery shell, so that the end surface of the substrate is attached to the first contact surface of the stepped structure, the bottom surface of the substrate is attached to the second contact surface of the stepped structure, and the substrate is welded with the first contact surface and the second contact surface through the welding process, so that the sealed connection between the substrate and the battery shell is realized, the welding contact area between the substrate and the battery shell is large, the welding is firm, and the sealing effect is good. The sealing element is connected between the rivet and the substrate in a sealing manner, so that the sealing of the battery cell is realized, and the electrolyte can be prevented from leaking through a gap between the rivet and the substrate. In addition, compared with the sealing method of processing a rolling groove on the battery shell and folding the battery shell in the prior art, the sealing structure of the lithium battery has the advantages that the battery shell does not need to be bent, the processing technology is simple, the production process is simplified, the coating of the battery shell cannot be damaged, and the problem of electrolyte leakage caused by corrosion and rust of the battery shell is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and 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 the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic view of a lithium battery sealing structure according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
fig. 3 is a partially enlarged view at B in fig. 1.
In the figure:
1-a battery housing; 2-a cap assembly; 3-winding core; 4-pole ear; 5-upper gasket; 6-lower gasket; 7-a heat pipe;
11-a step structure;
111-a first contact surface; 112-a second contact surface;
21-a rivet; 22-a seal; 23-a substrate; 24-an insulating spacer; 25-pressing plate;
251-accommodating groove.
Detailed Description
In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present embodiment provides a sealing structure for a lithium battery, which can be applied to the production and processing of a lithium ion battery. The lithium battery sealing structure comprises a battery shell 1 and a cap assembly 2 sealed at the opening of the battery shell 1.
Referring to fig. 1 and 2, a step structure 11 is formed at an opening of the battery case 1 along a circumferential direction, the step structure 11 includes a first contact surface 111 and a second contact surface 112, and the first contact surface 111 is perpendicular to the second contact surface 112; the cap assembly 2 includes a rivet 21, a seal 22, and a base plate 23. The rivet 21 penetrates the base plate 23 and is connected to the tab 4 in the battery case 1, so that the rivet 21 is electrically conducted with the inside of the battery. The sealing member 22 is hermetically connected between the rivet 21 and the substrate 23, so that the cell is sealed and the electrolyte is prevented from leaking through a gap between the rivet 21 and the substrate 23. In this embodiment, the substrate 23 and the battery case 1 are each made of an aluminum material, and are lightweight, excellent in plasticity, and easy to process.
According to the lithium battery sealing structure provided by the embodiment, the stepped structure 11 is arranged at the opening of the battery shell 1, so that the end surface of the substrate 23 is attached to the first contact surface 111 of the stepped structure 11, the bottom surface of the substrate 23 is attached to the second contact surface 112 of the stepped structure 11, and the substrate 23 is welded to the first contact surface 111 and the second contact surface 112 through a welding process, so that the substrate 23 is hermetically connected with the battery shell 1, the welding contact area between the substrate 23 and the battery shell 1 is large, the welding is firm, and the sealing effect is good. In addition, compare in prior art on battery case 1 processing rolling slot and turn over the sealing method of turning over battery case 1, the lithium cell seal structure of this embodiment need not to buckle battery case 1, and processing technology is simple, has simplified the production processes to can not damage the cladding material of battery case 1, avoid leading to the emergence of electrolyte leakage problem because of battery case 1 corrodes and rusts.
In this embodiment, the substrate 23 and the first contact surface 111 and the second contact surface 112 of the battery case 1 are preferably welded by a laser welding process, which is fast in laser welding speed, small in deformation, simple in welding equipment, capable of welding at room temperature, and easy to implement.
Optionally, referring to fig. 1 and 3, the sealing member 22 includes a T-shaped sealing ring sleeved on the rivet 21, a T-shaped head of the T-shaped sealing ring abuts against a side of the substrate 23 facing the inner cavity of the battery case 1, and an end surface of the T-shaped sealing ring away from the T-shaped head is flush with a side of the substrate 23 facing away from the inner cavity of the battery case 1. In this embodiment, the base plate 23 is provided with a mounting hole, the T-shaped sealing ring is located in the mounting hole, and the bottom end of the rivet 21 is flush with the end surface of the T-shaped head of the T-shaped sealing ring. The radial force generated when the rivet 21 is riveted can press the T-shaped sealing ring on the hole wall of the mounting hole, so that the T-shaped sealing ring completely fills the gap between the rivet 21 and the hole wall of the mounting hole, and tight sealing is realized.
Compare the sealing washer that uses among the prior art, the T shape sealing washer structure of this embodiment is simpler, and the equipment is sealed more convenient, is favorable to simplifying production processes. The T-shaped sealing ring can be made of rubber materials, is wear-resistant and corrosion-resistant, and has good elasticity.
Optionally, in this embodiment, the rivet 21 is a solid structure, and the solid structure has better conductivity, which is beneficial to improving the conductive effect of the battery.
As shown in fig. 3, optionally, the cap assembly 2 further includes an insulating gasket 24, the insulating gasket 24 is disposed on a side of the substrate 23 facing away from the inner cavity of the battery case 1, and an end of the T-shaped sealing ring away from the T-shaped head is attached to the insulating gasket 24. In this embodiment, the insulating spacer 24 is provided with a through hole, the rivet 21 penetrates through the through hole of the insulating spacer 24, and the wall of the through hole is tightly attached to the outer peripheral wall of the rivet body of the rivet 21. The insulating spacer 24 can insulate the rivet 21 from the base plate 23, prevent the base plate 23 from being electrically connected to the inside of the battery, and prevent a short circuit.
With continued reference to fig. 3, the cap assembly 2 optionally further includes a pressure plate 25, the pressure plate 25 overlying the insulating spacer 24. The rivet 21 penetrates the pressure plate 25, the insulating gasket 24, and the base plate 23 in this order, and is connected to the tab 4 in the battery case 1. The pressing plate 25 can increase the acting force area of the head of the rivet 21 on the insulating washer 24, and prevent the insulating washer 24 from deforming.
Preferably, the pressure plate 25 is concavely provided with a receiving groove 251, and the head of the rivet body 21 is positioned in the receiving groove 251. The receiving groove 251 is provided to facilitate the passing of the rivet 21 during the riveting operation, and to prevent the pressure plate 25 from sliding relative to the rivet 21 so that the pressure plate 25 can support the rivet 21 well.
Further, the insulating spacer 24 and the pressing plate 25 are smaller than the base plate 23, but larger than the head of the rivet 21.
In this embodiment, the rivet 21, the pressing plate 25 and the tab 4 are made of copper material. The rivet 21 made of the copper material has certain strength, and the riveting effect can be ensured. The lug 4 made of the copper material and the rivet 21 made of the copper material are easier to weld, the conductivity is high, and the conductive effect of the battery can be ensured. The pressing plate 25 made of copper material has certain strength, can bear the pressing action force of the rivet 21, and prevents the insulating gasket 24 from deforming.
As shown in fig. 1, optionally, an upper gasket 5 is disposed in the battery case 1, a winding core 3 is disposed in the battery case 1 and filled with the electrolyte, and the upper gasket 5 is located at the top end of the winding core 3. Go up and be provided with utmost point ear hole on the gasket 5, utmost point ear 4 is drawn out from utmost point ear hole and is connected with positive terminal, goes up gasket 5 and can insulate the utmost point ear 4 after buckling and roll up core 3 and keep apart, prevents the short circuit. The upper gasket 5 is also provided with a liquid guide hole, and the liquid guide hole can provide a liquid discharge channel for electrolyte.
The roll core 3 comprises a positive plate, a first diaphragm, a negative plate and a second diaphragm which are sequentially stacked from inside to outside, and the positive plate, the first diaphragm, the negative plate and the second diaphragm are wound along the heat pipe 7 to form the roll core 3. And one side of the positive plate, which is close to the heat pipe 7, is provided with a tab 4, the tab 4 is connected with a rivet 21 of the cap assembly 2, the outer side of the negative plate is provided with a negative tab, and the negative tab is connected with a negative terminal positioned at the bottom of the battery shell 1.
With reference to fig. 1, optionally, a lower gasket 6 is disposed at the bottom of the battery case 1, the lower gasket 6 is clamped between the winding core 3 and the bottom wall of the battery case 1, and the lower gasket 6 can insulate and isolate the negative electrode tab from the winding core 3 to prevent short circuit.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the utility model. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A lithium battery sealing structure, comprising:
the battery comprises a battery shell (1), wherein a step structure (11) is arranged at an opening of the battery shell (1) along the circumferential direction, and the step structure (11) comprises a first contact surface (111) and a second contact surface (112);
the cap assembly (2) comprises a rivet (21), a sealing element (22) and a substrate (23), wherein the rivet (21) penetrates through the substrate (23) and is connected with a lug (4) in the battery shell (1), the sealing element (22) is connected with the rivet (21) and the substrate (23) in a sealing mode, the end face of the substrate (23) is attached to the first contact surface (111), the bottom face of the substrate (23) is attached to the second contact surface (112), and the substrate (23) is sealed with the first contact surface (111) and the second contact surface (112) in a welding mode.
2. The lithium battery sealing structure according to claim 1, wherein the sealing member (22) comprises a T-shaped sealing ring sleeved on the rivet (21), a T-shaped head of the T-shaped sealing ring abuts against one side of the base plate (23) facing the inner cavity of the battery shell (1), and an end face of one end of the T-shaped sealing ring, which is far away from the T-shaped head, is flush with one side of the base plate (23) facing away from the inner cavity of the battery shell (1).
3. The lithium battery sealing structure according to claim 2, wherein the base plate (23) is provided with a mounting hole, the T-shaped sealing ring is located in the mounting hole, and the rivet (21) can press the T-shaped sealing ring against the wall of the mounting hole.
4. A lithium battery sealing structure according to claim 3, characterized in that the rivet (21) is of solid construction.
5. The lithium battery sealing structure according to claim 1, wherein the cap assembly (2) further comprises an insulating gasket (24), the insulating gasket (24) is arranged on the side of the substrate (23) facing away from the inner cavity of the battery shell (1), and the rivet (21) penetrates through the insulating gasket (24).
6. The lithium battery sealing structure according to claim 5, wherein the cap assembly (2) further comprises a pressing plate (25), the pressing plate (25) is disposed on the insulating gasket (24), and the rivet (21) penetrates the pressing plate (25), the insulating gasket (24) and the substrate (23) in sequence.
7. The lithium battery sealing structure according to claim 6, wherein a receiving groove (251) is concavely provided on the pressing plate (25), and a shank head of the rivet (21) is located in the receiving groove (251).
8. The lithium battery sealing structure according to claim 6, characterized in that the rivet (21), the pressing plate (25), and the tab (4) are all made of a copper material.
9. The lithium battery sealing structure according to any one of claims 1-8, characterized in that an upper gasket (5) is provided inside the battery case (1), a winding core (3) is provided inside the battery case (1) and filled with an electrolyte, and the upper gasket (5) is located at the top end of the winding core (3).
10. The lithium battery sealing structure according to claim 9, characterized in that a lower gasket (6) is provided at the bottom of the battery case (1), the lower gasket (6) being sandwiched between the winding core (3) and the bottom wall of the battery case (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121703449.6U CN215496875U (en) | 2021-07-26 | 2021-07-26 | Lithium battery sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121703449.6U CN215496875U (en) | 2021-07-26 | 2021-07-26 | Lithium battery sealing structure |
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| CN215496875U true CN215496875U (en) | 2022-01-11 |
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| CN202121703449.6U Active CN215496875U (en) | 2021-07-26 | 2021-07-26 | Lithium battery sealing structure |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115483487A (en) * | 2022-09-27 | 2022-12-16 | 楚能新能源股份有限公司 | Cylindrical battery and manufacturing method thereof |
| CN116014389A (en) * | 2023-02-09 | 2023-04-25 | 深圳海润新能源科技有限公司 | Energy storage device and electric equipment |
| US12021271B1 (en) | 2023-02-09 | 2024-06-25 | Shenzhen Hithium Energy Storage Technology Co., Ltd. | Energy-storage apparatus and electricity-consumption device |
-
2021
- 2021-07-26 CN CN202121703449.6U patent/CN215496875U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115483487A (en) * | 2022-09-27 | 2022-12-16 | 楚能新能源股份有限公司 | Cylindrical battery and manufacturing method thereof |
| CN115483487B (en) * | 2022-09-27 | 2024-01-23 | 楚能新能源股份有限公司 | Cylindrical battery and manufacturing method thereof |
| CN116014389A (en) * | 2023-02-09 | 2023-04-25 | 深圳海润新能源科技有限公司 | Energy storage device and electric equipment |
| CN116014389B (en) * | 2023-02-09 | 2023-06-30 | 深圳海润新能源科技有限公司 | Energy storage device and electric equipment |
| US12021271B1 (en) | 2023-02-09 | 2024-06-25 | Shenzhen Hithium Energy Storage Technology Co., Ltd. | Energy-storage apparatus and electricity-consumption device |
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