CN217062214U - Improved generation lithium cell tip structure - Google Patents
Improved generation lithium cell tip structure Download PDFInfo
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- CN217062214U CN217062214U CN202220623598.XU CN202220623598U CN217062214U CN 217062214 U CN217062214 U CN 217062214U CN 202220623598 U CN202220623598 U CN 202220623598U CN 217062214 U CN217062214 U CN 217062214U
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Abstract
The utility model discloses an improved end structure of a lithium battery, which comprises a shell, an electric core, a current collecting piece, a current collecting column, a sealing ring, a bottom cover and the like, wherein a sleeved isolation cover is added on the top of the current collecting column, and an upper hem bent upwards in the circumferential direction is arranged on the periphery of the isolation cover; and meanwhile, a lower folded edge with a downward bent circumference is arranged on the periphery of the outer cover, the lower folded edge is assembled in the upper folded edge, and a pressing ring is arranged in the upper folded edge to be hermetically assembled between the lower folded edge and the outer circumference of the flow collecting column. Obviously, the design of above-mentioned lithium cell tip structure is simpler, convenient, especially adopts the isolation lid of upper hem design and the enclosing cover of lower hem design, and the excellent and good of product performance can more be taken into account simultaneously to this kind of unique design of upper and lower hem, and its cooperation is corresponding manufacturing approach, the better automated processing who satisfies production facility makes the needs.
Description
Technical Field
The utility model relates to a lithium cell's manufacturing specifically indicates an improved generation lithium cell tip structure.
Background
At present, the end part of a shell is required to be sealed to form a positive electrode end or a negative electrode end of a lithium battery in the manufacture of cylindrical lithium batteries, and the end part structures are very important for the design and the production process of the lithium battery, so that the use requirements of the performance of the lithium battery, the manufacturability requirements and the requirement for realizing the automation of production equipment are met; although many of the end structures of lithium batteries of the prior designs have been able to have better structural characteristics, with the increasing application of lithium batteries and the expanding market demand, manufacturers of lithium batteries are also developing additional and developing additional to provide more lithium batteries with different end structures, so as to take into account the advantages of good product performance and meeting the requirements of automatic processing and manufacturing of production equipment.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem lie in overcoming prior art's defect and providing one kind can compromise the lithium cell end structure of product performance excellence and satisfy the automatic processing of production facility and make needs simultaneously.
The technical problem of the utility model is realized through following technical scheme:
an improved end part structure of a lithium battery comprises a shell, a battery cell in the shell, and a current collector which is arranged at the end part of the shell and seals the battery cell; a bottom cover is arranged outside the current collecting piece, a sealing cover is arranged between the current collecting piece and the bottom cover, a current collecting column is arranged on the current collecting piece, and the battery cell, the current collecting piece and the current collecting column form electric conduction; the flow collecting column is internally provided with a welding hole and a sealing plug plugged in the welding hole, the top of the flow collecting column sequentially penetrates through the sealing cover and the bottom cover to be provided with an outer cover, the outer cover and the flow collecting column form electric conduction, the sealing plug is hermetically covered in the welding hole, the top of the flow collecting column is sleeved with an insulating cover, and the periphery of the insulating cover is provided with an upper folded edge which is bent upwards in the circumferential direction; the periphery of the outer cover is provided with a lower folding edge which is bent downwards in the circumference and is assembled in the upper folding edge; and a pressing ring which is hermetically assembled between the lower folded edge and the outer circumference of the flow collecting column is arranged in the upper folded edge.
The bottom of the flow collecting column is provided with a retaining ring which is sleeved and fixed, the retaining ring is assembled between the flow collecting sheet and the sealing cover, and the middle part of the flow collecting column is provided with an outer shoulder which props against the retaining ring.
The outer circumference of the current collecting piece is provided with a flange which is turned upwards in the circumferential direction, an insulating ring is arranged between the flange and the shell, and an edge covering which is used for wrapping the flange in the circumferential direction is arranged on the insulating ring.
The sealing cover is provided with a sealing hole for the top of the current collecting column to pass through, the bottom cover is provided with a cover hole for the top of the current collecting column to pass through, the inner circumference of the sealing hole is provided with a sealing edge extending upwards in the circumferential direction, the sealing edge penetrates through the cover hole to be in sealing contact with the insulating cover, the bottom cover and the current collecting column are sealed, or the sealing edge penetrates through the cover hole and the insulating cover in sequence and then is in sealing contact with the pressing ring, and the bottom cover, the insulating cover and the current collecting column are sealed.
The sealing plug is arranged in the welding hole through the sealing plug of the sealing ring at the outer circumference.
The sealing plug is a solid cylindrical block or a hollow cylindrical block with an H-shaped cross section.
The current collecting piece is provided with a current collecting hole, the bottom of the current collecting column is provided with a bottom hole respectively communicated with the current collecting hole and the welding hole, and the outer cover is provided with a top hole.
An explosion-proof valve is arranged in the sealing plug.
The bottom cover is matched and assembled in the end part of the shell, the outer circumference of the bottom cover is pressed by the turned edge of the end part of the shell to form connection, or the bottom cover is directly formed by connecting and circumferentially bending the end part of the shell.
Compared with the prior art, the utility model is mainly characterized in that a sleeved insulating cover is added on the top of the current-collecting column, and an upper folding edge which is bent upwards in the circumferential direction is arranged on the periphery of the insulating cover; and meanwhile, the periphery of the outer cover is provided with a lower folded edge of which the circumference is bent downwards, the lower folded edge is assembled in the upper folded edge, and a pressing ring is also arranged in the upper folded edge to be hermetically assembled between the lower folded edge and the outer circumference of the flow collecting column. Obviously, the design of the end part structure of the lithium battery is simpler and more convenient, and the end part structure can simultaneously take the advantages of the use performance of the product and meet the requirements of automatic processing and manufacturing of production equipment.
Drawings
Fig. 1 is a schematic sectional structural view of a first end structure of the present invention.
Fig. 2 is a perspective view of fig. 1.
Fig. 3 is a schematic cross-sectional structural view of a second end portion structure of the present invention.
Fig. 4 is a schematic sectional view of the collector column and the retainer ring.
Fig. 5 is a schematic sectional view of the outer cap.
Fig. 6 is a schematic sectional view of the insulating cover.
FIG. 7 is a schematic cross-sectional view of an end construction suitable for a one-piece bottom cover.
Fig. 8 is a first closure configuration of the collector plate at the end of the housing.
Fig. 9 is a second closure configuration of the collector plate at the end of the housing.
Fig. 10 is a sectional view of a first sealing structure of the sealing strip in fig. 1 and 3.
Figure 11 is a cross-sectional view of the second type of seal shown in figure 7.
Fig. 12 is a schematic structural view of the bottom cover in fig. 1.
Fig. 13 is a schematic structural view of the sealing cover in fig. 1.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings.
As shown in the figures 1-13, 1 is a shell, 11 is a turned edge, 12 is a rolling groove, 13 is an insulating ring, 131 is a covered edge, 2 is an electric core, 3 is a current collecting piece, 31 is a current collecting hole, 32 is a turned edge, 4 is a bottom cover, 41 is a cover hole, 5 is a sealing cover, 51 is a sealing hole, 511 is a sealing edge, 52 is a caulking groove, 6 is a current collecting column, 61 is a welding hole, 62 is a bottom hole, 63 is an outer shoulder, 7 is an insulating cover, 71 is an upper folded edge, 8 is an outer cover, 81 is a lower folded edge, 82 is a top hole, 9 is a sealing plug, 91 is a sealing ring, 92 is a retaining ring, 93 is an explosion-proof valve, 10 is a pressing ring, and the like.
An improved end structure of a lithium battery, as shown in fig. 1 and fig. 3, mainly relates to the manufacture of an end seal of a cylindrical lithium battery, which comprises a cylindrical casing 1 made of metal, a battery cell 2 arranged in the casing, and a current collecting plate 3 mounted at the end of the casing and sealing the battery cell 2.
The closed structure of the current collecting piece 3 at the end of the outer shell 1 is shown in fig. 8 and 9, and mainly means that the outer circumference of the current collecting piece 3 is provided with a flange 32 which is turned over upwards in the circumferential direction, an insulating ring 13 is arranged between the flange and the outer shell 1, and an edge 131 which is shown in fig. 1, 3 or 7 and circumferentially wraps the flange 32 is arranged on the insulating ring, so that the structural compactness and the insulation property between the two are ensured.
The current collecting piece 3 is externally provided with a bottom cover 4, a sealing cover 5 is arranged between the current collecting piece 3 and the bottom cover 4 for spacing, namely, as shown in fig. 1, the sealing cover 5 and the bottom cover 4 are sequentially arranged on the current collecting piece 3, the bottom cover 4 is just embedded in an embedding groove 52 formed by turning over the outer circumference of the sealing cover 5, the current collecting piece 3 is also provided with a current collecting column 6, and the battery core 2, the current collecting piece 3 and the current collecting column 6 are electrically conductive to lead out current.
The flow collecting column 6 is internally provided with a welding hole 64 and a sealing plug 9 plugged in the welding hole 64, specifically, the sealing plug is arranged in the welding hole 61 through a sealing ring 94 on the outer circumference, the top of the flow collecting column 6 sequentially penetrates through the sealing cover 5 and the bottom cover 4 and then is provided with the outer cover 8, the outer cover and the flow collecting column 6 form electric conduction, and the sealing plug 9 is hermetically covered in the welding hole 61.
Meanwhile, the top of the current collecting column 6 is sleeved with an insulating cover 7, actually, the outer cover 8 is installed after the top of the current collecting column 6 sequentially passes through the sealing cover 5, the bottom cover 4 and the insulating cover 7, and the periphery of the insulating cover 7 is provided with an upper folding edge 71 which is bent upwards in the circumferential direction as shown in fig. 6, that is to say, the insulating cover 7 is combined with the upper folding edge 71 to form a cover-shaped part which is opened upwards; and the outer periphery of the outer cover 8 is provided with a lower folded edge 81 which is circumferentially bent downwards as shown in fig. 5, namely, the outer cover 8 and the lower folded edge 81 just form a cover-shaped part which is opened downwards, the lower folded edge 81 is completely assembled in the upper folded edge 71, and then the upper folded edge is also internally provided with a pressing ring 10 which is hermetically assembled between the lower folded edge 81 and the outer periphery of the current collecting column 6.
At this time, the lower folded edge 81 bent downward at the outer circumference of the outer cap 8 is separated from the bottom cap 4 by the insulating cap 7 to prevent a contact short circuit, and is also in sealing engagement with the outer circumference of the current collecting post 6 by the pressing ring 10.
The sealing cover 5 is provided with a sealing hole 51 for the top of the collecting column 6 to pass through, the bottom cover 4 is provided with a cover hole 41 for the top of the collecting column 6 to pass through, the inner circumference of the sealing hole 51 is provided with a sealing edge 511 extending upwards in the circumferential direction, the sealing edge has two sealing structures, the first sealing edge is tightly pressed and contacted on the insulating cover 7 after passing through the cover hole 41 as shown in figure 10, so that the bottom cover 4 and the collecting column 6 are sealed, the second sealing edge is tightly pressed and contacted on the pressing ring 10 after passing through the cover hole 41 and passing through the insulating cover 7 as shown in figure 11, so that the bottom cover 4 and the insulating cover 7 are sealed and contacted with the collecting column 6, and the sealing edge 511 passing through the cover hole 41 is slightly wrapped outwards and reversely around the bottom cover 4, thereby improving the sealing performance and the compactness of the structure.
The bottom of the collecting column 6 is sleeved with a retaining ring 92 shown in fig. 4, the retaining ring and the collecting column 6 are made of the same material, the middle part of the collecting column 6 is provided with an outer shoulder 63 which is propped against the retaining ring 92, and the outer shoulder and the retaining ring 92 are welded and fixed into a whole through the outer shoulder; meanwhile, the retainer ring 92 is arranged between the collector plate 3 and the sealing cover 5 and is actually embedded in an installation space formed by bending the sealing cover 5.
The split weld-fastened collector post 6 and retainer ring 92 are designed for two primary purposes: firstly, the split type flow collecting column 6 and the check ring 92 are convenient to process, namely the two parts are independently processed and then sleeved and welded into a whole, so that the split type flow collecting column is simpler and more convenient; secondly, the contact area between the current collecting column 6 and the current collecting piece 3 is increased through the retaining ring 92, and other components such as the sealing cover 5, the bottom cover 4, the insulating cover 7 and the like can be pressed on the retaining ring 92, so that the compactness and the stability of the installation structure of the current collecting column 6 are ensured, and the current collecting column 6 is prevented from being flushed by the internal pressure of the shell 1.
The sealing plug 9 is a solid cylindrical block as shown in fig. 1 and fig. 2 or a hollow cylindrical block with an H-shaped cross section as shown in fig. 3, if the hollow cylindrical block with the H-shaped cross section is adopted, a collecting hole 31 needs to be arranged on the collecting sheet 3, a bottom hole 62 which is respectively communicated with the collecting hole 31 and the welding hole 61 as shown in fig. 4 needs to be arranged at the bottom of the collecting column 6, and a top hole 82 needs to be arranged on the outer cover 8. In addition, an explosion-proof valve 93 opposite to the bottom hole 62 is required to be arranged in the sealing plug 9, particularly in the middle of the H shape, so as to play a role of safety protection. If the sealing plug 9 is a solid cylindrical block, the top hole 82 does not need to be formed in the outer cover 8.
In addition, the end structure of the present invention can be applied to two types of bottom cover 4 structures, one of which is a split bottom cover structure as shown in fig. 1-3, i.e. the bottom cover 4 as an independent component is assembled in the end of the housing 1 in an inosculating manner, the outer circumference of the bottom cover 4 is pressed by the turned edge 11 of the end of the housing 1 to form a connection, the outer circumference of the housing 1 is further provided with a rolling groove 12 to press the periphery of the current collecting piece 3, i.e. to press the fixed insulating ring 13; another one is a one-piece bottom cover structure as shown in fig. 7, that is, the bottom cover 4 is directly formed by bending the end of the housing 1 one-piece circumferentially.
Obviously, the design of the end part structure of the lithium battery is simpler and more convenient, and particularly, the insulating cover 7 designed by the upper folding edge 71 and the outer cover 8 designed by the lower folding edge 81 are adopted, so that the unique design of the upper folding edge and the lower folding edge can give consideration to the advantages of the use performance of the product and meet the requirements of automatic processing and manufacturing of production equipment.
The manufacturing method of the improved lithium battery end part structure mainly comprises the following steps:
step one, a shell 1, an electric core 2, a current collecting piece 3, an insulating ring 13, a current collecting column 6, a check ring 92, a sealing cover 5, a bottom cover 4, an insulating cover 7, an outer cover 8, a sealing plug 9 and a pressing ring 10 which form the lithium battery are manufactured for standby, wherein the shell 1 and the bottom cover 4 adopt two structure modes: the first is that the bottom cover 4 is matched and assembled in the end part of the shell 1, the outer circumference of the bottom cover 4 is pressed by the curled edge 11 at the end part of the shell 1 to form connection; the second is that the bottom cover 4 is directly formed by connecting and circumferentially bending the end part of the shell 1;
step two, if the shell 1 and the bottom cover 4 adopt the first structural mode, then
Firstly, an electric core 2 is arranged in a shell 1, a current collecting piece 3 is arranged at the end part of the shell 1 in a sealing way through an insulating ring 13, the current collecting piece 3 and a pole lug of the electric core 2 are fixed in a welding way through welding, and the insulating ring 13 is fixed by inward pressing deformation of a rolling groove 12 on the outer circumference of the shell 1;
secondly, the bottom cover 4 and the sealing cover 5 are assembled into a whole, namely the bottom cover 4 is embedded in an embedded groove 52 formed by folding the outer circumference of the sealing cover 5, and a sealing edge 511 at the central sealing hole 51 of the sealing cover 5 also needs to be plugged into the cover hole 41 of the bottom cover 4;
thirdly, the flow collecting column 6 is arranged on the flow collecting piece 3, the flow collecting column 6 and the check ring 92 need to be welded and fixed into a whole in advance, the bottom cover 4 and the sealing cover 5 which are assembled into a whole are arranged on the flow collecting piece 3, the top of the flow collecting column 6 sequentially penetrates through the sealing hole 51 of the sealing cover 5 and the cover hole 41 of the bottom cover 4, and meanwhile, the check ring 92 is just assembled in an installation space formed by bending the sealing cover 5;
the outer circumferences of the bottom cover 4 and the sealing cover 5 are pressed by the curled edge 11 at the end part of the shell 1 to form connection, and the sealing edge 511 inserted into the cover hole 41 just seals the space between the bottom cover 4 and the flow collecting column 6;
fifthly, the insulating cover 7 and the pressing ring 10 are sleeved on the top of the flow collecting column 6 which sequentially passes through the sealing cover 5 and the bottom cover 4, the sealing edge 511 which is plugged into the cover hole 41 is in sealing contact with the insulating cover 7, and the pressing ring 10 is welded with the flow collecting column 6;
sixthly, welding and fixing the current collecting column 6 and the current collecting sheet 3 through a welding hole 61 of the current collecting column 6, injecting electrolyte into the shell 1 through a bottom hole 62 at the bottom of the current collecting column 6 and a current collecting hole 31 on the current collecting sheet 3, sealing and installing a sealing plug 9 with an explosion-proof valve 93 into the welding hole 61 of the current collecting column 6, and welding the sealing plug 9 and the current collecting column 6;
the top of the collecting column 6 is provided with an outer cover 8 fixed by welding, a sealing plug 9 is hermetically covered in the welding hole 61 by the outer cover, a lower folded edge 81 of the outer cover 8 is assembled in an upper folded edge 71 of the insulating cover 7, and a pressing ring 10 is extruded to seal the lower folded edge 81 of the outer cover 8 and the outer circumference of the collecting column 6;
if the second structure is adopted for the outer shell 1 and the bottom cover 4, then
Firstly, assembling the current collecting piece 3 and the insulating ring 13 into a whole, then installing the current collecting piece 3 and the electrode lug of the electric core 2 on the electric core 2, and welding and fixing the current collecting piece 3 and the electrode lug of the electric core 2;
secondly, the sealing ring 5 is arranged in the shell 1 with the bottom cover 4, and the sealing edge 511 at the central sealing hole 51 of the sealing ring 5 is plugged into the cover hole 41 of the bottom cover 4;
thirdly, the flow collecting column 6 and the check ring 92 are welded and fixed into a whole in advance, the top of the flow collecting column 6 sequentially penetrates through the sealing hole 51 of the sealing cover 5 and the cover hole 41 of the bottom cover 4, and meanwhile, the check ring 92 is just assembled in an installation space formed by bending the sealing cover 5;
fourthly, the insulating cover 7 and the pressing ring 10 are sleeved on the top of the current collecting column 6 which sequentially penetrates through the sealing cover 5 and the bottom cover 4, the sealing edge 511 which is plugged into the cover hole 41 penetrates through the cover hole 41 and then penetrates through the insulating cover 7 to be in sealing contact with the pressing ring 10, so that the bottom cover 4, the insulating cover 7 and the current collecting column 6 are sealed, and the pressing ring 10 and the current collecting column 6 are welded;
the current collecting piece 3, the insulating ring 13 and the battery cell 2 which are assembled into a whole are plugged into the shell 1;
sixthly, welding and fixing the current collecting column 6 and the current collecting sheet 3 through a welding hole 61 of the current collecting column 6, injecting electrolyte into the shell 1 through a bottom hole 62 at the bottom of the current collecting column 6 and a current collecting hole 31 on the current collecting sheet 3, sealing and installing a sealing plug 9 with an explosion-proof valve 93 into the welding hole 61 of the current collecting column 6, and welding the sealing plug 9 and the current collecting column 6;
the top of the collecting column 6 is provided with an outer cover 8 fixed by welding, a sealing plug 9 is sealed and covered in the welding hole 61 by the outer cover, a lower folding edge 81 of the outer cover 8 is assembled in an upper folding edge 71 of the insulating cover 7, and a pressing ring 10 is extruded to seal the lower folding edge 81 of the outer cover 8 and the outer circumference of the collecting column 6.
The above description is only an embodiment of the present invention, and those skilled in the art should understand that any structural design similar to the embodiment is included in the protection scope of the present invention.
Claims (9)
1. An improved end part structure of a lithium battery comprises a shell (1), a battery cell (2) in the shell, and a current collecting sheet (3) which is arranged at the end part of the shell and seals the battery cell (2); a bottom cover (4) is arranged outside the current collecting piece, a sealing cover (5) is arranged between the current collecting piece (3) and the bottom cover (4), a current collecting column (6) is arranged on the current collecting piece (3), and the battery cell (2), the current collecting piece (3) and the current collecting column (6) form electric conduction; the flow collecting column is characterized in that an insulating cover (7) is sleeved at the top of the flow collecting column (6), and an upper folding edge (71) which is bent upwards in the circumferential direction is arranged on the periphery of the insulating cover; the periphery of the outer cover (8) is provided with a lower folded edge (81) which is bent downwards in the circumference and is assembled in the upper folded edge (71); and a pressing ring (10) which is hermetically assembled between the lower folded edge (81) and the outer circumference of the flow collecting column (6) is arranged in the upper folded edge (71).
2. An improved lithium battery end structure according to claim 1, characterized in that the bottom of the current collecting column (6) is provided with a fixed collar (92) which is fitted between the current collecting piece (3) and the sealing cover (5), and the middle of the current collecting column (6) is provided with an external shoulder (63) which abuts against the collar (92).
3. An improved end structure of lithium battery as claimed in claim 1, characterized in that the current collector (3) is provided with a flange (32) which is turned upwards along the circumference at the outer circumference, an insulating ring (13) is provided between the flange and the housing (1), and the insulating ring is provided with a covered edge (131) which covers the flange (32) along the circumference.
4. An improved lithium battery end structure according to claim 1, wherein the sealing cover (5) is provided with a sealing hole (51) for allowing the top of the current collecting post (6) to pass through, the bottom cover (4) is provided with a cover hole (41) for allowing the top of the current collecting post (6) to pass through, the inner circumference of the sealing hole (51) is provided with a sealing edge (511) extending circumferentially upward, the sealing edge passes through the cover hole (41) to be in sealing contact with the insulating cover (7) and form a seal between the bottom cover (4) and the current collecting post (6), or the sealing edge (511) passes through the cover hole (41) and the insulating cover (7) in sequence to be in sealing contact with the pressing ring (10) and form a seal between the bottom cover (4), the insulating cover (7) and the current collecting post (6).
5. An improved lithium battery end structure according to claim 1, characterized in that the sealing plug (9) is fitted into the weld hole (61) via an outer circumferential sealing ring (91) sealing plug.
6. An improved lithium battery end structure according to claim 1, characterized in that the sealing plug (9) is a solid cylindrical block or a hollow cylindrical block with an H-shaped cross section.
7. An improved end structure of lithium battery as claimed in claim 6, wherein said current collecting plate (3) is provided with current collecting holes (31), the bottom of the current collecting post (6) is provided with bottom holes (62) respectively communicating the current collecting holes (31) and the welding holes (61), and the outer cover (8) is provided with top holes (82).
8. An improved lithium battery end construction according to claim 1, characterized in that the sealing plug (9) is provided with an explosion-proof valve (93).
9. An improved end structure of lithium battery as claimed in claim 1, characterized in that the bottom cover (4) fits inside the end of the housing (1) in a fitting manner, the outer circumference of the bottom cover (4) is pressed by the turned edge (11) of the end of the housing (1) to form a connection, or the bottom cover (4) is directly formed by bending the end of the housing (1) integrally and circumferentially.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220623598.XU CN217062214U (en) | 2022-03-22 | 2022-03-22 | Improved generation lithium cell tip structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220623598.XU CN217062214U (en) | 2022-03-22 | 2022-03-22 | Improved generation lithium cell tip structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217062214U true CN217062214U (en) | 2022-07-26 |
Family
ID=82492122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220623598.XU Active CN217062214U (en) | 2022-03-22 | 2022-03-22 | Improved generation lithium cell tip structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217062214U (en) |
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2022
- 2022-03-22 CN CN202220623598.XU patent/CN217062214U/en active Active
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