CN102332601B - Cylindrical lithium ion battery - Google Patents
Cylindrical lithium ion battery Download PDFInfo
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- CN102332601B CN102332601B CN201010600755.7A CN201010600755A CN102332601B CN 102332601 B CN102332601 B CN 102332601B CN 201010600755 A CN201010600755 A CN 201010600755A CN 102332601 B CN102332601 B CN 102332601B
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- lithium ion
- top cover
- cylindrical lithium
- ion battery
- burst disk
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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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Abstract
The invention relates to the technical field of lithium ion batteries, in particular to a cylindrical lithium ion battery. The cylindrical lithium ion battery comprises a battery casing, a pole piece group accommodated in the battery casing, electrolyte filled in the battery casing and a cap which is sealed and assembled to the battery casing, wherein the cap comprises a top cover; the circumferential edge of the top cover is outwards bent to form a bent step; an explosion-proof sheet is covered at the bottom of the top cover; and the circumferential edge of the explosion-proof sheet is connected with the bottom of the bent step in a sealing manner. Compared with the prior art, in the cylindrical lithium ion battery disclosed by the invention, the top cover, a rubber ring and the casing in a sealing port participate in sealing connection; and sealing stepped grooves are respectively arranged on the upper surface and the lower surface of the circumferential edge of the top cover, thus the explosion-proof sheet in the sealing port is prevented from being deformed due to stress; a pressure release value of the explosion-proof sheet is prevented from being increased or not being opened by exposing; safety problems such as burning, explosion and the like are reduced; and the stability, the sealing property, safety performances and the capacity space of the cylindrical lithium ion battery are improved.
Description
Technical field:
The present invention relates to technical field of lithium ion, refer in particular to cylindrical lithium ion battery.
Background technology:
Along with the development of modern society, the mobile devices such as video camera, notebook computer, portable DVD player and digital camera have had application more and more widely.Cylindrical lithium ion battery, as a kind of environmental protection battery, has the advantages such as high-energy-density, high working voltage and long life, and therefore the application in various mobile devices is more and more extensive.
See shown in Fig. 1,2, existing cylindrical lithium ion battery generally comprises battery container 11, has the pole piece group 12 of winding-structure, pole piece group by positive plate, negative plate and be interval in positive plate and negative plate between barrier film reel and to form, the pole piece group 12 with winding-structure packs in battery container and is filled with electrolyte, then by battery cap 13, seals.
Conventionally, the support platform that block 13 relies on slot rolling to form, is realized and is connected as a single entity and seals by battery container 11 crimpings.Because of the support platform that slot rolling forms shorter and out-of-level, in edge curling seal process, because pressing down, faucal edge can cause block 13 to move down and walk, burst disk 14 assembly distortion in block 13, the FAQs causing because of burst disk 14 assembly distortion is as follows: 1. cause power-off and the fluctuation of pressure release value and become large, product comes into the market and easily goes out potential safety hazard; 2. cushion rubber 15 decrement fluctuations, cause sealing variation; 3. pack clearance changes, and causes resistance fluctuation.Had a strong impact on the security performance of cylindrical lithium ion battery.
In view of this, necessaryly provide a kind of cylindrical lithium ion battery with Good Security.
Summary of the invention:
Object of the present invention is exactly to provide a kind of cylindrical lithium ion battery with Good Security for the deficiency of prior art existence.
To achieve these goals, the technical solution used in the present invention is:
Cylindrical lithium ion battery, it comprises battery container, be contained in the pole piece group in battery container, electrolyte and the seal group being filled in battery container is connected to the block on battery container, block includes top cover, the periphery outward of top cover forms bending step, the bottom cover of top cover is provided with burst disk, and the periphery of burst disk is connected with the sealed bottom of bending step.
As a kind of improvement of cylindrical lithium ion battery of the present invention, between described burst disk and bending step, by laser welded seal, syndeton is firm, good airproof performance.
A kind of improvement as cylindrical lithium ion battery of the present invention, the middle part of described bending step baseplane has upwards been recessed to form ring-shaped step groove, the periphery of burst disk is arranged in step groove, avoided burst disk stress deformation in sealing, prevent that explosion-proof tablet pressure relief value from becoming greatly even quick-fried and not opening, reduce the generation of the safety problems such as burning and blast.
As a kind of improvement of cylindrical lithium ion battery of the present invention, the diameter of described burst disk is less than the external diameter of step groove, and the diameter that is preferably burst disk is less than the external diameter 0.05～0.5mm of step groove, and the degree of depth of described step groove is less than or equal to the thickness of burst disk.The welding point of top cover and burst disk forms docking mode, and this mode is beneficial to the less welding energy input of realization, obtains the i.e. larger weld strength of larger fusion penetration, and can reduce the thermal deformation of assembly.
As a kind of improvement of cylindrical lithium ion battery of the present invention, between the periphery of described top cover and battery container, by rubber sealing, be fixedly connected with, sound construction, air-tightness is good.
Further improvement as cylindrical lithium ion battery of the present invention, the periphery of the coated top cover of described cushion rubber, battery container is sealed cushion rubber and top cover compacting by the inside pressing of cushion rubber outer surface, closure part only has top cover, cushion rubber and housing to participate in, the stress point of top cover is outer, can fall into the horizontal support section of housing slot rolling moulding, in housing flanged opening sealing is implemented, can guarantee indeformable, do not move, avoided burst disk stress deformation.
A kind of improvement as cylindrical lithium ion battery of the present invention, the peripheral indentation of described bending step is formed with the seal groove of the recessed or concave and downward convex of epirelief, in sealing process, sealing groove place is fixing maximum stress point, and faying face, not in same level, improves the sealing of faying face.
A kind of improvement as cylindrical lithium ion battery of the present invention, in described block, be provided with the orifice plate that is positioned at pole piece group top, on orifice plate, offer at least one pore, orifice plate is electrically connected at the bottom of burst disk with welding manner, when the gas pressure value of inside battery surpasses scheduled pressure value, gas can be torn by stomatal action in burst disk and by burst disk, to discharge in time the gas in battery, prevents that battery is on fire or explodes.
Beneficial effect of the present invention is: it comprises battery container, be contained in the pole piece group in battery container, be filled in the electrolyte in battery container, and seal group is connected to the top cover on battery container, the periphery outward of top cover forms bending step, the bottom cover of top cover is provided with burst disk, the periphery of burst disk is connected with the sealed bottom of bending step, with respect to prior art, in cylindrical lithium ion battery of the present invention, in sealing, only has top cover, cushion rubber and housing participate in being tightly connected, and on the periphery of top cover, lower two sides is provided with sealed step groove, therefore avoided burst disk stress deformation in sealing, prevent that explosion-proof tablet pressure relief value from becoming greatly even quick-fried and not opening, reduce the generation of the safety problems such as burning and blast, improve the stability of cylindrical lithium ion battery, sealing, the lifting of security performance and volume space.
Accompanying drawing explanation:
Figure 1 shows that the cross-sectional schematic of the block of prior art cylindrical type lithium ion battery.
Fig. 2 is the cross-sectional schematic that is equiped with the cylindrical lithium ion battery of the block shown in Fig. 1.
Fig. 3 is the cross-sectional schematic of the block of cylindrical lithium ion battery of the present invention.
Fig. 4 is the cross-sectional schematic that is equiped with the cylindrical lithium ion battery of the present invention of the block shown in Fig. 3.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is further illustrated:
Refer to shown in Fig. 3 and Fig. 4, cylindrical lithium ion battery of the present invention comprises: battery container 21, be contained in pole piece group 22 in battery container 21, be filled in electrolyte (mark) in battery container 21 and the battery cap 20 of sealed cell housing 21, block 20 includes top cover 23, burst disk 24, cushion rubber 25, orifice plate 26.The periphery outward of top cover 23 forms bending step 231, and the bottom cover of top cover 23 is provided with burst disk 24, and wherein, the periphery of burst disk 24 is connected to the bottom of bending step 231 by laser welded seal.
Please, especially with reference to shown in Fig. 4, be provided with the orifice plate 26 that is positioned at pole piece group 22 tops in battery cap 20, offer at least one pore 261 on orifice plate 26, orifice plate 26 is electrically connected at the bottom of burst disk 24 with welding manner.When the gas pressure value of inside battery surpasses scheduled pressure value, gas can be acted in burst disk 24 and by burst disk 24 and be torn by pore 261, to discharge in time the gas in battery, prevents that battery is on fire or explodes.
The preparation of positive plate: using LiCoO2 as positive active material, using carbon black as conductive agent, using and gather inclined to one side difluoro and make ethene as binding agent, with N, N-dimethyl pyrrolidone (NMP), as solvent, is uniformly mixed formation anode sizing agent by above-mentioned raw materials; Anode sizing agent is coated on to the two sides of plus plate current-collecting body aluminium foil, after being dried, through rolling, cutting, forms the positive plate of preliminary dimension.
The preparation of negative plate: using graphite as negative electrode active material, using and gather inclined to one side difluoro and make ethene as binding agent, using NMP as solvent, above-mentioned raw materials is uniformly mixed, form cathode size; Cathode size is coated on to the two sides of negative current collector Copper Foil, after being dried, through rolling, cutting, forms the negative plate of preliminary dimension.
The preparation of pole piece group 22: the positive plate of preparing according to aforementioned technique, negative plate and polyethylene barrier film are wound into pole piece group 22 by volume pin.
The preparation of cylindrical lithium ion battery: the pole piece group 22 of preparing according to aforementioned technique is placed in to battery container 21, injects electrolyte, and seal by battery cap 20, make cylindrical lithium ion battery of the present invention.
Shown in Fig. 3 and Fig. 4, describe the block 20 of cylindrical lithium ion battery of the present invention in detail.
By bending on top cover 23, form bending step 231, burst disk 24 is arranged to bending step 231 places process laser welded seal.In sealing, only have top cover 23, cushion rubber 25 and housing 21 to participate in being tightly connected, and the periphery upper and lower faces of top cover 23 is provided with sealed step groove 232, therefore burst disk 24 stress deformations in sealing have been avoided, prevent that burst disk 24 pressure release values from becoming greatly even quick-fried and not opening, reduce the generation of the safety problems such as burning and blast, improve stability, sealing, the security performance of cylindrical lithium ion battery.
The middle part of bending step 231 baseplanes of top cover 23 has upwards been recessed to form ring-shaped step groove 232, the periphery of burst disk 24 is arranged in step groove 232, the degree of depth of step groove 232 is less than or equal to the thickness of burst disk 24, the diameter of step groove 232 is more than or equal to the external diameter of burst disk 24, object is that top cover 23 and the welding point of burst disk 24 are designed to docking mode, this mode is beneficial to the less welding energy input of realization, obtain the i.e. larger weld strength of larger fusion penetration, and can reduce the thermal deformation of assembly.For example, according to an embodiment of the invention, the degree of depth of step groove 232 approximates the thickness of burst disk 24, and the diameter of step groove 232 is greater than approximately 0.05～0.5mm of burst disk 24 external diameters.
The peripheral region punch forming of the bending step 231 of top cover 23 has the seal groove 233 of the recessed or concave and downward convex of epirelief.In sealing process, sealing groove 233 places are fixing maximum stress point, and faying face is not in same level, improves the sealing of faying face.
Between the periphery of top cover 23 and battery container 21, by cushion rubber 25, be sealedly and fixedly connected, wherein, the periphery of cushion rubber 25 coated top covers 23, battery container 21 is sealed cushion rubber 25 and top cover 23 compactings by the inside pressing of cushion rubber 25 outer surface.Closure part only has top cover 23, cushion rubber 25 and housing 21 to participate in, top cover 23 is again hard metal material, and top cover 23 outer rings are coated without other assembly except cushion rubber 25, the stress point of top cover 23 is outer, can fall into the horizontal support section of housing 21 slot rolling moulding, in housing 21 flanged opening sealings are implemented, can guarantee indeformable, do not move, avoided burst disk 24 stress deformations.
Structure of the present invention is suppressed test by gas, and it is air tight that pressure-resistant stopping property is greater than 3.0Mpa.The standing test of 24H of putting upside down after falling for 9 times by 1 meter high concrete floor, no leakage.Because having cancelled the structure of the coated top covers 23 of burst disk 24 upper and lower surfaces, top cover 23 thickness reductions of the present invention 30%.
The announcement of book and instruction according to the above description, those skilled in the art in the invention can also carry out suitable change and modification to above-mentioned execution mode.Therefore, the present invention is not limited to embodiment disclosed and described above, to modifications and changes more of the present invention, also should fall in the protection range of claim of the present invention.In addition,, although used some specific terms in this specification, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (8)
1. cylindrical lithium ion battery, it comprises battery container, be contained in the pole piece group in battery container, be filled in the electrolyte in battery container, and seal group is connected to the block on battery container, block includes top cover, it is characterized in that: the periphery outward of described top cover forms bending step, the bottom cover of top cover is provided with burst disk, the middle part of described bending step baseplane has upwards been recessed to form ring-shaped step groove, the periphery of burst disk is connected with the sealed bottom of bending step and the periphery of burst disk is arranged in step groove, the diameter of described burst disk is less than the external diameter of step groove.
2. cylindrical lithium ion battery according to claim 1, is characterized in that: between described burst disk and bending step, pass through laser welded seal.
3. cylindrical lithium ion battery according to claim 1, is characterized in that: the diameter of described burst disk is less than the external diameter 0.05～0.5mm of step groove.
4. cylindrical lithium ion battery according to claim 2, is characterized in that: the degree of depth of described step groove is less than or equal to the thickness of burst disk.
5. cylindrical lithium ion battery according to claim 1, is characterized in that: between the periphery of described top cover and battery container, by rubber sealing, be fixedly connected with.
6. cylindrical lithium ion battery according to claim 5, is characterized in that: the periphery of the coated top cover of described cushion rubber, battery container is sealed cushion rubber and top cover compacting by the inside pressing of cushion rubber outer surface.
7. cylindrical lithium ion battery according to claim 1, is characterized in that: the peripheral indentation of described bending step is formed with the seal groove of the recessed or concave and downward convex of epirelief.
8. cylindrical lithium ion battery according to claim 1, is characterized in that: in described block, be provided with the orifice plate that is positioned at pole piece group top, offer at least one pore on orifice plate, orifice plate is electrically connected at the bottom of burst disk with welding manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010600755.7A CN102332601B (en) | 2010-12-21 | 2010-12-21 | Cylindrical lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010600755.7A CN102332601B (en) | 2010-12-21 | 2010-12-21 | Cylindrical lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN102332601A CN102332601A (en) | 2012-01-25 |
| CN102332601B true CN102332601B (en) | 2014-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010600755.7A Active CN102332601B (en) | 2010-12-21 | 2010-12-21 | Cylindrical lithium ion battery |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103531730B (en) * | 2012-07-02 | 2017-03-15 | 深圳市沃特玛电池有限公司 | A kind of Leak-proof cap of lithium-ion-power cell |
| CN107359296B (en) * | 2017-07-24 | 2023-11-10 | 东营悦泰技术服务有限公司 | Lithium battery module and pressure relief device thereof |
| CN109346775A (en) * | 2018-10-26 | 2019-02-15 | 大连中比动力电池有限公司 | Seal structure for lithium battery and lithium battery |
| CN111974706A (en) * | 2020-09-14 | 2020-11-24 | 宁波市万恒电池配件有限公司 | Micro battery sealing and explosion-proof structure and internal pressure detection method |
| CN214336854U (en) * | 2020-11-24 | 2021-10-01 | 深圳市比克动力电池有限公司 | Cylindrical lithium battery |
| CN114497829A (en) * | 2021-12-29 | 2022-05-13 | 深圳市创益通技术股份有限公司 | Triangular new energy power battery structure and manufacturing method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2793932Y (en) * | 2005-05-13 | 2006-07-05 | 深圳粤宝电子工业总公司 | Explosive-proof cover of battery |
| CN101777634A (en) * | 2010-03-16 | 2010-07-14 | 周卫炳 | High-magnification cylindrical explosion-proof composite cap for lithium ion battery |
| CN201966290U (en) * | 2010-12-21 | 2011-09-07 | 东莞新能源科技有限公司 | Cylinder-type lithium ion battery |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5002868B2 (en) * | 2001-05-16 | 2012-08-15 | パナソニック株式会社 | Secondary battery and manufacturing method thereof |
| CN201549536U (en) * | 2009-11-13 | 2010-08-11 | 天津锦泰勤业精密电子有限公司 | Improved explosion prevention cover plate structure of lithium ion battery |
| CN101807674B (en) * | 2010-04-13 | 2012-07-04 | 天津三合意电子有限公司 | Lithium ion power battery cap and welding method thereof |
-
2010
- 2010-12-21 CN CN201010600755.7A patent/CN102332601B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2793932Y (en) * | 2005-05-13 | 2006-07-05 | 深圳粤宝电子工业总公司 | Explosive-proof cover of battery |
| CN101777634A (en) * | 2010-03-16 | 2010-07-14 | 周卫炳 | High-magnification cylindrical explosion-proof composite cap for lithium ion battery |
| CN201966290U (en) * | 2010-12-21 | 2011-09-07 | 东莞新能源科技有限公司 | Cylinder-type lithium ion battery |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2002-343316A 2002.11.29 |
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| CN102332601A (en) | 2012-01-25 |
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