CN217239694U - Cylinder lithium cell - Google Patents
Cylinder lithium cell Download PDFInfo
- Publication number
- CN217239694U CN217239694U CN202221003603.3U CN202221003603U CN217239694U CN 217239694 U CN217239694 U CN 217239694U CN 202221003603 U CN202221003603 U CN 202221003603U CN 217239694 U CN217239694 U CN 217239694U
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- China
- Prior art keywords
- current collecting
- shell
- negative electrode
- connecting unit
- collecting disc
- Prior art date
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 20
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 20
- 238000004804 winding Methods 0.000 claims abstract description 24
- 238000007789 sealing Methods 0.000 claims description 27
- 238000003466 welding Methods 0.000 claims description 20
- 239000007788 liquid Substances 0.000 claims description 14
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 229910052802 copper Inorganic materials 0.000 claims description 7
- 239000010949 copper Substances 0.000 claims description 7
- 239000002131 composite material Substances 0.000 claims description 5
- 238000005096 rolling process Methods 0.000 claims description 4
- 239000003792 electrolyte Substances 0.000 abstract description 5
- 238000004880 explosion Methods 0.000 abstract description 4
- 239000000126 substance Substances 0.000 abstract description 4
- 229910000831 Steel Inorganic materials 0.000 description 12
- 239000010959 steel Substances 0.000 description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 238000003754 machining Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Classifications
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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
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- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model discloses a cylindrical lithium battery, which comprises a shell, a roll core, a positive electrode connecting unit and a negative electrode connecting unit; the positive electrode connecting unit and the negative electrode connecting unit are respectively and fixedly arranged at two ends of the shell; the winding core is arranged in the shell, and two ends of the winding core are fixedly connected with the positive electrode connecting unit and the negative electrode connecting unit respectively; the negative electrode connecting unit comprises a negative electrode current collecting disc, a plurality of notches are formed in the middle of the negative electrode current collecting disc, and a plurality of notches are formed in the side edge of the negative electrode current collecting disc. The lithium battery of the utility model ensures the reliable connection between the battery components through the arrangement of the shell, the winding core, the anode connecting unit, the cathode connecting unit and other structures; meanwhile, a plurality of notches are formed in the middle of the negative electrode current collecting disc, a plurality of notches are formed in the outer side of the negative electrode current collecting disc, electrolyte is convenient to soak, and when the battery thermal runaway exists subsequently, the battery thermal runaway is convenient to open, internal substances can be sprayed out, and explosion can be prevented.
Description
Technical Field
The utility model relates to a power lithium cell technical field specifically is a cylinder lithium cell.
Background
Steel-shell cylindrical batteries such as 18650 and 21700 are mature products, the connection mode of the negative electrode and the shell is generally small welding points formed by resistance welding, and if the diameter is continuously enlarged, the mode of connecting the small welding points adopted before the enlarged diameter leads to overlarge internal resistance, and then the battery has high energy consumption, high heat generation and other adverse effects during heavy current charging and discharging due to the fact that the connection area is too small. At the moment, the connection area of the battery cell, the lugs and the shell can be increased by adopting a full lug connection mode, and the battery with reduced internal resistance has obvious advantages on a large cylindrical battery.
Meanwhile, when the positive and negative electrodes are on the same side, the case requires overcurrent. The conventional shell is made of steel, and if the shell is made of steel, the shell has enough strength but poor flow capacity.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve lies in: a cylindrical lithium battery is provided.
In order to solve the technical problem, the utility model provides a following technical scheme:
a cylindrical lithium battery comprises a shell, a winding core, a positive electrode connecting unit and a negative electrode connecting unit;
the positive electrode connecting unit and the negative electrode connecting unit are respectively and fixedly arranged at two ends of the shell; the winding core is arranged in the shell, and two ends of the winding core are fixedly connected with the positive electrode connecting unit and the negative electrode connecting unit respectively;
the negative electrode connecting unit comprises a negative electrode current collecting disc, a plurality of notches are formed in the middle of the negative electrode current collecting disc, and a plurality of notches are formed in the side edge of the negative electrode current collecting disc.
The advantages are that: the lithium battery of the utility model ensures the reliable connection between the battery components through the arrangement of the structures such as the shell, the winding core, the anode connecting unit, the cathode connecting unit and the like; meanwhile, a plurality of notches are formed in the middle of the negative electrode current collecting disc, a plurality of notches are formed in the outer side of the negative electrode current collecting disc, electrolyte is convenient to soak, and when the battery thermal runaway exists subsequently, the battery thermal runaway is convenient to open, internal substances can be sprayed out, and explosion can be prevented.
Preferably, the positive electrode connecting unit comprises a positive electrode current collecting disc, a riveting ring, a stopping frame, a pole, a top sealing ring, an insulating plate and a liquid injection hole sealing sheet;
the positive current collecting disc, the riveting ring and the stopping frame are all positioned in the shell;
the positive electrode current collecting disc is fixedly arranged at the upper end of the winding core; the riveting ring is fixedly arranged at the upper end of the positive current collecting disc; the stop frame is fixedly arranged at the upper end of the riveting ring, and the upper end of the stop frame is contacted with the shell;
the pole, the top sealing ring, the insulating plate and the liquid injection hole sealing piece are all positioned outside the shell;
the pole is stepped, a small step of the pole extends into the shell and is fixedly connected with the riveting ring, and the top sealing ring and the insulating plate are arranged between the shell and a large step of the pole; the utmost point post still is provided with annotates the liquid hole, annotate liquid hole mounting in the notes liquid hole of utmost point post.
Preferably, the cross section of the middle part of the positive current collecting disc is of an S-shaped structure.
Preferably, the liquid injection hole sealing piece is connected with the pole in a laser welding mode, and the pole is connected with the positive current collecting plate in a laser welding mode.
Preferably, the winding core is connected with the positive current collecting disc in a laser welding mode.
Preferably, the negative electrode connection unit further comprises an explosion-proof valve and a bottom sealing ring;
the bottom of the shell is provided with a rolling groove curled edge, and the negative pole current collecting disc, the explosion-proof valve and the bottom sealing ring are arranged on the rolling groove curled edge;
the negative current collecting disc is fixedly arranged at the lower end of the winding core; the explosion-proof valve is installed at the lower end of the negative current collecting disc, and the bottom sealing ring is installed at the lower end of the explosion-proof valve.
Preferably, the number of the notches is three, and the number of the notches is eight.
Preferably, the case and the anode current collecting plate are connected by laser welding.
Preferably, the winding core is connected with the anode current collecting disc in a laser welding mode.
Preferably, the number of the notches is three, and the number of the notches is eight.
Preferably, the housing is a steel-copper composite.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a three notch has been seted up at negative pole current collector middle part, and eight breachs have been seted up in the outside, and the electrolyte of being convenient for soaks to and when follow-up existence battery thermal runaway, be convenient for open, help the blowout of inside material, prevent to explode.
(2) The utility model discloses an anodal current collector middle part adopts the curved structure of S, can realize pasting tightly with utmost point post under the condition that individual accessory has machining error, and the follow-up utmost point post of being convenient for welds with anodal current collector. The connection is more flexible.
(3) The utility model discloses a casing adopts copper steel composite metal, through calculating, the ability of overflowing of the steel casing of 0.5mm wall thickness matches with 0.1 mm's copper +0.2 mm's steel ability of overflowing. Therefore the utility model discloses a casing compares with the conventional steel casing of the same specification, has stronger ability of overflowing.
Drawings
Fig. 1 is a cross-sectional view of an embodiment of the present invention;
fig. 2 is an exploded schematic view of an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion A of FIG. 1;
FIG. 4 is an enlarged view of part B of FIG. 1;
fig. 5 is a schematic structural diagram of a positive current collecting plate according to an embodiment of the present invention;
fig. 6 is a schematic structural view of an anode current collecting plate according to an embodiment of the present invention;
fig. 7 is a schematic diagram of the overall structure of the embodiment of the present invention.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present invention by those skilled in the art, the technical solutions of the present invention will now be further described with reference to the drawings attached to the specification.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, the present embodiment discloses a cylindrical lithium battery, which includes a case 1, a winding core 2, a positive electrode connecting unit 3, and a negative electrode connecting unit 4.
The shell 1 of the embodiment is made of a steel-copper composite material, and the flow capacity of the steel shell with the wall thickness of 0.5mm is calculated to be equivalent to the flow capacity of 0.1mm of copper and 0.2mm of steel. Therefore, the housing 1 of the present embodiment has a stronger current-carrying capacity than the conventional steel housing 1 of the same specification.
Referring to fig. 2 and 3, the positive electrode connection unit 3 includes a positive current collecting plate 31, a rivet ring 32, a stopper 33, a pole 34, a top seal ring 35, an insulating plate 36, and a liquid injection hole sealing piece 37.
The shell 1 is of a cylindrical structure, and a round hole 11 for installing the anode connecting unit 3 is formed in the middle of the upper end of the shell 1.
The positive current collecting disc 31, the riveting ring 32 and the stop frame 33 are all positioned in the shell 1; the winding core 2 is mounted inside the can 1. The positive current collecting disc 31 is a disc-shaped structure matched with the inner wall of the shell 1, and the positive current collecting disc 31 is fixedly arranged at the upper end of the winding core 2. The rivet ring 32 is fixedly installed at the upper end of the positive current collecting plate 31. The stop rack 33 is a disc-shaped structure matched with the inner wall of the shell 1, the stop rack 33 is fixedly arranged at the upper end of the riveting ring 32, and the upper end of the stop rack 33 is contacted with the shell 1. And the positive electrode current collecting plate 31, the caulking ring 32, the stopper bracket 33 and the circular hole 11 of the case 1 are coaxial.
The pole 34, the top seal ring 35, the insulating plate 36 and the liquid injection hole sealing piece 37 are all positioned outside the shell 1. Utmost point post 34 is the stairstepping, and in the little ladder of utmost point post 34 stretched into casing 1 through round hole 11, was provided with buckle 341 at the bottom of the little ladder lateral wall of utmost point post 34, riveting ring 32 was provided with the draw-in groove 321 with buckle 341 matched with, and utmost point post 34 is through riveting mode cooperation fixed mounting outside casing 1, and top seal ring 35 and insulation board 36 are installed between casing 1 and utmost point post 34's big ladder. The pole post 34 is also provided with a pour hole, and a pour hole sealing piece 37 is fixedly mounted in the pour hole of the pole post 34.
After the top sealing ring 35 and the insulating plate 36 are installed, the sealing capability of the whole battery is ensured by extruding the sealing ring through the large step of the pole 34 after the pole 34 is installed.
Referring to fig. 5, in some embodiments, the cross section of the middle portion of the positive current collecting plate 31 has an S-bend structure, and the upper end of the middle portion of the positive current collecting plate 31 is a convex plane 311, and the convex plane 311 is ensured to move up and down by the S-bend. Under the condition that individual fittings have machining errors, the pole post 34 can still be attached tightly, and the subsequent welding between the pole post 34 and the positive current collecting plate 31 is facilitated.
Specifically, the injection hole sealing piece 37 and the electrode post 34 are connected by laser welding, and the electrode post 34 and the positive current collecting plate 31 are connected by laser welding. The winding core 2 and the positive current collecting plate 31 are connected by laser welding.
Referring to fig. 2 and 4, negative electrode connection unit 4 includes a negative electrode current collecting plate 41, an explosion-proof valve 42, and a bottom sealing ring 43.
The bottom of case 1 has a roll groove curl 12, and anode current collecting disk 41, explosion-proof valve 42 and bottom seal 43 are mounted on roll groove curl 12. Wherein, the negative current collecting disc 41 is fixedly arranged at the lower end of the winding core 2; explosion-proof valve 42 is installed at the lower end of anode current collecting plate 41, and bottom sealing ring 43 is installed at the lower end of explosion-proof valve 42.
Referring to fig. 6, in some embodiments, the central portion of the anode current collecting plate 41 is formed with a plurality of notches 411, and the side edge of the anode current collecting plate 41 is formed with a plurality of notches 412. In this embodiment, the number of the notches 411 is three, and the number of the notches 412 is eight. Three notches 411 and eight notches 412 are formed in the negative current collecting plate 41, so that the negative current collecting plate is convenient for electrolyte to soak, and is convenient to open when the battery thermal runaway exists subsequently, internal substances can be sprayed out conveniently, and explosion can be prevented.
Specifically, case 1 and anode current collecting plate 41 are connected by laser welding. The winding core 2 and the anode current collecting plate 41 are connected by laser welding.
Referring to fig. 7, in the embodiment, the housing 1 is made of copper-steel composite metal, and the overcurrent capacity of the steel shell with the wall thickness of 0.5mm is calculated to be equivalent to that of 0.1mm of copper and 0.2mm of steel. The middle part of the positive current collecting disc 31 adopts an S-shaped structure, so that the positive current collecting disc can be tightly attached to the pole 34 under the condition that machining errors exist in accessories, and the subsequent welding of the pole 34 and the positive current collecting disc 31 is facilitated. The middle part of the negative electrode current collecting disc 41 is welded with the winding core 2, and the outer ring is welded with the inner roll groove surface of the shell 1 after roll groove, so that the connection of the negative electrode and the shell 1 is realized. The negative current collecting plate 41 is provided with three notches 411 and eight notches 412, so that electrolyte can be infiltrated conveniently, and the negative current collecting plate can be turned over conveniently when the battery is in thermal runaway subsequently, internal substances can be sprayed out conveniently, and explosion can be prevented.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The above embodiments only represent the implementation modes of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and for those skilled in the art, without departing from the concept of the present invention, a plurality of deformations and improvements can be made, and these all belong to the protection scope of the present invention.
Claims (10)
1. The utility model provides a cylinder lithium cell which characterized in that: comprises a shell (1), a roll core (2), a positive electrode connecting unit (3) and a negative electrode connecting unit (4);
the positive electrode connecting unit (3) and the negative electrode connecting unit (4) are respectively and fixedly arranged at two ends of the shell (1); the winding core (2) is arranged in the shell (1), and two ends of the winding core (2) are fixedly connected with the positive electrode connecting unit (3) and the negative electrode connecting unit (4) respectively;
the negative electrode connecting unit (4) comprises a negative electrode current collecting disc (41), a plurality of notches (411) are formed in the middle of the negative electrode current collecting disc (41), and a plurality of gaps (412) are formed in the side edge of the negative electrode current collecting disc (41).
2. The cylindrical lithium battery of claim 1, wherein: the positive electrode connecting unit (3) comprises a positive electrode current collecting disc (31), a riveting ring (32), a stopping frame (33), an electrode post (34), a top sealing ring (35), an insulating plate (36) and a liquid injection hole sealing sheet (37);
the positive collector disc (31), the riveting ring (32) and the stopping frame (33) are all positioned in the shell (1);
the positive electrode current collecting disc (31) is fixedly arranged at the upper end of the winding core (2); the riveting ring (32) is fixedly arranged at the upper end of the positive collector disc (31); the stopping frame (33) is fixedly arranged at the upper end of the riveting ring (32), and the upper end of the stopping frame (33) is contacted with the shell (1);
the pole (34), the top sealing ring (35), the insulating plate (36) and the liquid injection hole sealing sheet (37) are all positioned outside the shell (1);
the pole (34) is in a step shape, a small step of the pole (34) extends into the shell (1) to be fixedly connected with the riveting ring (32), and the top sealing ring (35) and the insulating plate (36) are installed between the shell (1) and a large step of the pole (34); the post (34) is also provided with a liquid injection hole, and the liquid injection hole sealing sheet (37) is fixedly installed in the liquid injection hole of the post (34).
3. The cylindrical lithium battery of claim 2, wherein: the cross section of the middle part of the positive collector plate (31) is of an S-shaped structure.
4. The cylindrical lithium battery of claim 2, wherein: annotate between liquid hole mounting (37) and utmost point post (34) and be connected through the laser welding mode, connect through the laser welding mode between utmost point post (34) and anodal current collector dish (31).
5. The cylindrical lithium battery of claim 2, wherein: the winding core (2) is connected with the positive current collecting disc (31) in a laser welding mode.
6. The cylindrical lithium battery of claim 1, wherein: the negative electrode connecting unit (4) further comprises an explosion-proof valve (42) and a bottom sealing ring (43);
the bottom of the shell (1) is provided with a rolling groove curled edge (12), and the negative current collecting disc (41), the explosion-proof valve (42) and the bottom sealing ring (43) are arranged on the rolling groove curled edge (12);
the negative electrode current collecting disc (41) is fixedly arranged at the lower end of the winding core (2); the explosion-proof valve (42) is arranged at the lower end of the negative current collecting disc (41), and the bottom sealing ring (43) is arranged at the lower end of the explosion-proof valve (42).
7. The cylindrical lithium battery of claim 6, wherein: the shell (1) is connected with the anode current collecting disc (41) in a laser welding mode.
8. The cylindrical lithium battery of claim 6, wherein: the winding core (2) is connected with the anode current collecting disc (41) in a laser welding mode.
9. The cylindrical lithium battery of claim 1, wherein: the number of the notches (411) is three, and the number of the notches (412) is eight.
10. The cylindrical lithium battery of claim 1, wherein: the shell (1) is made of a steel-copper composite material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221003603.3U CN217239694U (en) | 2022-04-26 | 2022-04-26 | Cylinder lithium cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221003603.3U CN217239694U (en) | 2022-04-26 | 2022-04-26 | Cylinder lithium cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217239694U true CN217239694U (en) | 2022-08-19 |
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ID=82821276
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221003603.3U Active CN217239694U (en) | 2022-04-26 | 2022-04-26 | Cylinder lithium cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217239694U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023216505A1 (en) * | 2022-05-12 | 2023-11-16 | 湖北亿纬动力有限公司 | Battery |
-
2022
- 2022-04-26 CN CN202221003603.3U patent/CN217239694U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023216505A1 (en) * | 2022-05-12 | 2023-11-16 | 湖北亿纬动力有限公司 | Battery |
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