CN210403784U - Explosion-proof cap of cylinder lithium cell - Google Patents
Explosion-proof cap of cylinder lithium cell Download PDFInfo
- Publication number
- CN210403784U CN210403784U CN201921461642.6U CN201921461642U CN210403784U CN 210403784 U CN210403784 U CN 210403784U CN 201921461642 U CN201921461642 U CN 201921461642U CN 210403784 U CN210403784 U CN 210403784U
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- Prior art keywords
- explosion
- proof
- cap
- battery
- sheet
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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
- 238000007789 sealing Methods 0.000 claims abstract description 19
- 238000002955 isolation Methods 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims description 11
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 230000002159 abnormal effect Effects 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000011076 safety test Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000013022 venting Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 208000012266 Needlestick injury Diseases 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007773 negative electrode material Substances 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 239000007774 positive electrode material Substances 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Images
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
- 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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- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model discloses an explosion-proof cap of a cylindrical lithium battery, which comprises a top cover, an explosion-proof sheet, an isolation ring, a connecting sheet and a sealing ring, wherein the top cover is sequentially connected with the explosion-proof sheet, the isolation ring and the connecting sheet to form an inner core of the cap; the sealing ring is sleeved on the periphery of the outer part of the cap inner core; the connecting sheet is provided with an exhaust hole, and the area of the exhaust hole is 0.01-1.9mm2And the center distance between the exhaust hole and the center of the connecting sheet is 1-10 mm. The utility model provides a cylinderThe explosion-proof cap of the lithium battery can effectively exhaust gas when the battery is out of order due to thermal runaway, release the pressure inside the battery, and ensure that the battery around the battery in the module is not affected after a certain battery is out of order, thereby improving the overall safety of the battery.
Description
Technical Field
The utility model belongs to the technical field of the battery safety, concretely relates to explosion-proof block of cylinder lithium cell.
Background
At present, the new energy automobile industry also pays attention to the safety of the battery on the basis of paying attention to the improvement of the energy density of the battery. In order to ensure the safe operation of the electric vehicle, a series of safety tests need to be carried out on the battery, and the safety tests in the prior national standard mainly focus on the items such as extrusion, needling, overcharge and the like. The needlestick test was cancelled in the national standard of 2018, and instead, the battery pack thermal diffusion test was introduced. Currently, a safety test item of thermal instability is introduced into domestic vehicle enterprises. The thermal instability test can simulate the influence state of the battery on the peripheral battery after the battery is out of control, has stronger destructiveness on the battery, and can better reflect the real service condition of the battery.
The thermal instability passing rate of the current cylindrical battery is low, which is not beneficial to the use of the cylindrical battery in the fields of power automobiles and 3C. In the process of improving the safety of the cylindrical battery, the positive and negative electrode materials with high thermal stability, the diaphragm and the electrolyte are selected, and the appearance structure of the battery can be improved.
SUMMERY OF THE UTILITY MODEL
In order to solve the prior art not enough, the utility model provides an explosion-proof cap of cylinder lithium cell can release the inside pressure of battery effectual exhaust when the battery thermal runaway became invalid, guarantees that a certain battery became invalid after, can not lead to the fact the influence to the battery on every side in the module to improve the holistic security of battery.
The utility model discloses the technological effect that will reach is realized through following scheme:
the utility model provides a cylindrical lithium battery explosion-proof cap, including top cap, explosion-proof piece, cage washer, connection piece and sealing washer, the top cap connects gradually explosion-proof piece, cage washer and connection piece, forms the cap inner core; the sealing ring is sleeved on the periphery of the outer part of the cap inner core; the connecting sheet is provided with an exhaust hole, and the area of the exhaust hole is 0.01-1.9mm2And the center distance between the exhaust hole and the center of the connecting sheet is 1-10 mm.
The top cover is a hard nickel-plated round iron sheet, plays a role in conducting and supporting when the battery works normally, and the nickel plating is beneficial to improvement and stabilityOxidation resistance and conductivity of the top cover. The explosion-proof piece is soft aluminum sheet, plays electrically conductive and sealed effect when the battery normally works, takes place when unusual at the battery, opens circuit with battery inside to when battery internal pressure is too big, in time break the pressure release, guarantee the holistic security of battery. The isolating ring is sleeved on the explosion-proof sheet and used for improving the stability of the cap and the anti-seismic performance of the battery. The connecting sheet is arranged between the positive electrode of the battery and the explosion-proof sheet, plays a role in conducting electricity when the battery works normally, and isolates solid matters in the battery. The sealing ring is used for sealing and fixing the inner core of the cover cap to form a complete battery cover cap, and plays a role in sealing and insulating; meanwhile, the connecting sheet is prevented from falling into the battery to cause internal short circuit, and the safety of the battery is improved. The exhaust hole is used for timely exhausting gas in the battery to relieve pressure when the battery is abnormal, so that the battery is prevented from exploding; the area of the exhaust hole is 0.01-1.9mm2The size of the vent hole is small compared with the vent hole area in the prior art, the speed of venting hole pressure relief can be limited while the battery can be guaranteed to vent and relieve pressure towards the cap direction, the center distance between the vent hole and the center of the connecting sheet is 1-10mm, stress of venting and relieving pressure of the battery can be concentrated on the position, close to the center, of the connecting sheet, the cap is forced to be sprayed out of a steel shell when the thermal runaway temperature is low and the bearing pressure is small, the relative integrity of a cap assembly is guaranteed, and the overall safety performance of a battery module is further improved.
In order to further optimize the overall structure of the cap, the vent holes are uniformly arranged on the connecting piece, and preferably the number of the vent holes is 1-20.
Furthermore, the shape of the exhaust hole is one or the combination of a circular structure, a square structure, a semicircular structure and an arc structure, so that the overall structure of the cap can be optimized, and the difficulty in processing the exhaust hole due to the different shapes can be avoided.
Furthermore, the section of the connecting sheet is of a flat disc structure and comprises a middle pressure relief part and peripheral fixing parts, the pressure relief part is connected with the explosion-proof sheet and used for communicating and conducting the battery anode and the explosion-proof sheet and isolating solid matters in the battery, and the exhaust hole is formed in the pressure relief part; the fixed part is used for fixing the isolation ring and the explosion-proof sheet, and the stability of the cap and the anti-seismic performance of the battery are improved.
Furthermore, the top cover comprises a middle protruding part and a peripheral extending part, the protruding part is used for communicating an external circuit, the distance between the top cover and the explosion-proof sheet is increased, the explosion space of the explosion-proof sheet is increased, and the explosion pressure is more stable; the extension part is used for connecting and fixing the top cover and the explosion-proof sheet, the top cover is a main supporting structure of the cap, and the cap is not deformed.
Further, the cross-section of explosion-proof piece is the ladder groove structure, including the explosion-proof portion at middle part and the connecting portion of periphery, just connecting portion are connected with the extension of top cap for the explosion-proof piece is connected with the top cap with fixed, explosion-proof portion bottom is connected with the pressure relief portion of connection piece for the explosion-proof piece is connected with the connection piece with fixed, and explosion-proof portion is for to the inside bellied arc wall structure of battery, has further increased the interval between explosion-proof piece and the top cap, has increased the space that explosion-proof piece bursts, makes burst pressure more stable.
Furthermore, the connection of the connecting part and the extending part and the connection of the bottom end of the explosion-proof part and the pressure relief part are laser welding structures, and the connecting part and the extending part are connected by adopting the laser welding structures, so that the internal resistance of the battery can be effectively reduced, and the over-current capacity of the battery can be improved; the bottom end of the explosion-proof part is connected with the pressure relief part in a laser spot welding mode, so that the welding area of the explosion-proof piece and the connecting piece can be effectively reduced, the battery tab is prevented from being connected with the connecting piece and the explosion-proof piece, the battery power-off control is not facilitated, and the safety performance of the battery is improved. And the welding positions of the connecting part and the extending part are 3-5, and the connecting part and the extending part are uniformly distributed on the edge of the top cover in an annular shape, so that the sealing performance of the cap can be ensured when the battery works normally, and the cap assembly can be relatively complete and can be sprayed out of the steel shell together when the battery is abnormal and the internal pressure is increased, thereby ensuring the consistency of the cap.
Furthermore, the explosion-proof part is provided with a rupture scribed line, so that the battery works abnormally, and when the internal pressure is increased, the explosion-proof sheet is easy to rupture, thereby facilitating the pressure relief of the battery.
Furthermore, the isolation ring is of a circular ring structure matched with the explosion-proof sheet, is sleeved on the explosion-proof part and is used for fixing the explosion-proof sheet and improving the stability of the cap and the anti-seismic performance of the battery.
Furthermore, the sealing ring is made of PBT material, has a high melting point, is relatively slow to melt in a high-temperature environment, has good battery sealing performance, ensures that the cap has enough air pressure to spray out of the steel shell, and further improves the overall safety performance of the battery pack.
The utility model discloses an explosion-proof block of cylinder lithium cell has following advantage:
the area of the vent hole on the middle connecting piece of the utility model is 0.01-1.9mm2The speed of pressure relief of the vent hole can be effectively limited, the center distance between the vent hole and the center of the connecting sheet is 1-10mm, the stress of the battery venting and pressure relief can be concentrated on the position, close to the center, of the connecting sheet, the cap is forced to be sprayed out of the steel shell when the thermal runaway temperature is low and the bearing pressure is low, the relative integrity of a cap assembly is ensured, and the overall safety performance of the battery module is further improved.
Drawings
Fig. 1 is a schematic sectional structure view of an explosion-proof cap for a cylindrical lithium battery according to the present invention;
fig. 2 is a schematic sectional structure view of the middle top cover of the present invention;
FIG. 3 is a schematic cross-sectional view of the explosion-proof plate of the present invention;
FIG. 4 is a schematic cross-sectional view of the connecting sheet of the present invention;
fig. 5 is a structural bottom view of the middle top cover of the present invention;
fig. 6 is a structural bottom view of the middle connecting piece of the present invention.
The reference numerals are explained below:
100. a top cover; 110. a boss portion; 120. an extension portion; 200. an explosion-proof sheet; 210. an explosion-proof part; 211. breaking and scribing; 220. a connecting portion; 300. connecting sheets; 310. a pressure relief portion; 311. an exhaust hole; 320. a fixed part; 400. an isolation ring; 500. and (5) sealing rings.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
The explosion-proof cap for the cylindrical lithium battery in the embodiment, as shown in fig. 1-6, includes a top cap 100, an explosion-proof sheet 200, a spacer ring 400, a connecting sheet 300 and a sealing ring 500; the top cover is sequentially connected with the explosion-proof sheet, the isolation ring and the connecting sheet to form a cap inner core; the sealing ring is sleeved on the periphery of the outer part of the cap inner core, the connecting sheet is provided with an exhaust hole 311, and the area of the exhaust hole is 0.01-1.9mm2And the center distance between the exhaust hole and the center of the connecting sheet is 1-10 mm. In order to further optimize the whole structure of the cap, preferably, the exhaust holes are uniformly arranged on the connecting piece, and the number of the exhaust holes is 1-20; the shape of the exhaust hole is one or the combination of two of a circular structure, a square structure, a semicircular structure and an arc structure, so that the overall structure of the cap can be optimized, and the difficulty of processing the exhaust hole due to different shapes can be avoided.
As shown in fig. 4, the cross section of the connecting piece is a flat disc structure, and includes a middle pressure relief portion 310 and a peripheral fixing portion 320, the pressure relief portion is connected with the explosion-proof sheet, and the vent hole is formed in the pressure relief portion. As shown in fig. 2, the top cover includes a central boss 110 and a peripheral extension 120, which are the primary support structure for the cap and protect the cap from deformation.
As shown in the attached drawing 3, the section of the explosion-proof piece is of a stepped groove structure, and comprises an explosion-proof part 210 in the middle and a connecting part 220 on the periphery, the connecting part is connected with the extending part of the top cover, and the bottom end of the explosion-proof part is connected with the pressure relief part of the connecting piece. The connection of the connecting part and the extending part and the connection of the bottom end of the explosion-proof part and the pressure relief part are laser welding structures, so that the internal resistance of the battery can be effectively reduced, and the over-current capacity of the battery is improved; and the bottom end of the explosion-proof part is connected with the pressure relief part in a laser spot welding mode, so that the welding area of the explosion-proof sheet and the connecting sheet can be effectively reduced, the battery tab is prevented from being connected with the connecting sheet and the explosion-proof sheet, the battery power-off control is not facilitated, and the safety performance of the battery is improved. Furthermore, the welding positions of the connecting part and the extending part are 3-5 and are uniformly distributed on the edge of the top cover in an annular mode, so that the sealing performance of the cap can be guaranteed when the battery works normally, the cap assembly is relatively complete when the battery is abnormal and the internal pressure is increased, the steel shell is sprayed together, and the consistency of the cap is guaranteed. In addition, the explosion-proof part is provided with a rupture scribed line, so that the battery works abnormally, and when the internal pressure is increased, the explosion-proof sheet is easy to rupture, thereby facilitating the pressure relief of the battery.
The isolating ring is of a circular ring structure matched with the explosion-proof sheet, is sleeved on the explosion-proof part and is used for fixing the explosion-proof sheet and improving the stability of the cap and the anti-seismic performance of the battery. The sealing ring is made of PBT material, has higher melting point, relatively slower melting speed in a high-temperature environment, and better sealing performance of the battery, ensures that the cap has enough air pressure to spray out of the steel shell, and further improves the overall safety performance of the battery pack.
The utility model discloses an explosion-proof cap of cylinder lithium cell is suitable for but not limited to 18650, 21700 and the cylinder electricity core of 21900 model, and the area of exhaust hole is 0.01-1.9mm2Compared with the prior art, the exhaust hole area is small, the speed of exhausting and decompressing the battery can be limited when the battery exhausts and decompresses towards the cap direction, the center distance between the exhaust hole and the center of the connecting sheet is 1-10mm, the stress of the battery exhausting and decompressing can be concentrated on the position, close to the center, of the connecting sheet, the cap is forced to be sprayed out of a steel shell when the thermal runaway temperature is low and the bearing pressure is small, the relative integrity of a cap assembly is ensured, and the overall safety performance of a battery module is further improved.
According to the scheme of the above-mentioned embodiment, the utility model provides an explosion-proof cap of cylinder lithium cell can release the inside pressure of battery effectual exhaust when the battery thermal runaway became invalid, guarantees that certain battery became invalid after, can not lead to the fact the influence to the battery on every side in the module to improve the holistic security of battery.
It should be finally noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting the same, and although the embodiments of the present invention are described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the embodiments of the present invention can still be modified or replaced with equivalents, and these modifications or equivalent replacements cannot make the modified technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. The utility model provides an explosion-proof cap of cylinder lithium cell, includes top cap, explosion-proof piece, cage washer, connection piece and sealing washer, its characterized in that:
the top cover is sequentially connected with the explosion-proof sheet, the isolation ring and the connecting sheet to form a cap inner core; the sealing ring is sleeved on the periphery of the outer part of the cap inner core;
the connecting sheet is provided with an exhaust hole, and the area of the exhaust hole is 0.01-1.9mm2And the center distance between the exhaust hole and the center of the connecting sheet is 1-10 mm; the exhaust holes are uniformly arranged on the connecting sheet, and the number of the exhaust holes is 1-20;
the shape of the exhaust hole is one or the combination of two of a round structure, a square structure, a semicircular structure and an arc structure.
2. The explosion-proof cap for a cylindrical lithium battery as claimed in claim 1, wherein: the cross-section of connection piece is the flat structure, including the relief portion at middle part and fixed part on every side, just the exhaust hole is located on the relief portion.
3. The explosion-proof cap for a cylindrical lithium battery as claimed in claim 1, wherein: the top cover includes a central boss and a peripheral extension.
4. The explosion-proof cap for a cylindrical lithium battery as claimed in claim 1, wherein: the cross-section of explosion-proof piece is ladder groove structure, including the explosion-proof portion at middle part and the connecting portion of periphery, just connecting portion are connected with the extension of top cap, explosion-proof portion bottom is connected with the pressure relief portion of connection piece.
5. The cylindrical lithium battery explosion-proof cap of claim 4, wherein: the connection of the connecting part and the extending part and the connection of the bottom end of the explosion-proof part and the pressure relief part are laser welding structures; and the welding positions of the connecting part and the extending part are 3-5, and the connecting part and the extending part are uniformly distributed on the edge of the top cover in an annular shape.
6. The cylindrical lithium battery explosion-proof cap of claim 4, wherein: and a rupture scribed line is arranged on the explosion-proof part.
7. The cylindrical lithium battery explosion-proof cap of claim 4, wherein: the isolating ring is of a circular ring structure matched with the explosion-proof sheet and is sleeved on the explosion-proof part.
8. The explosion-proof cap for a cylindrical lithium battery as claimed in claim 1, wherein: the sealing ring is made of PBT material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921461642.6U CN210403784U (en) | 2019-09-04 | 2019-09-04 | Explosion-proof cap of cylinder lithium cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921461642.6U CN210403784U (en) | 2019-09-04 | 2019-09-04 | Explosion-proof cap of cylinder lithium cell |
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| Publication Number | Publication Date |
|---|---|
| CN210403784U true CN210403784U (en) | 2020-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921461642.6U Active CN210403784U (en) | 2019-09-04 | 2019-09-04 | Explosion-proof cap of cylinder lithium cell |
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| Country | Link |
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| CN (1) | CN210403784U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022110894A1 (en) * | 2020-11-24 | 2022-06-02 | 深圳市比克动力电池有限公司 | Cylindrical battery cap and cylindrical battery |
-
2019
- 2019-09-04 CN CN201921461642.6U patent/CN210403784U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022110894A1 (en) * | 2020-11-24 | 2022-06-02 | 深圳市比克动力电池有限公司 | Cylindrical battery cap and cylindrical battery |
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