CN102332601A - Cylindrical lithium ion battery - Google Patents
Cylindrical lithium ion battery Download PDFInfo
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- CN102332601A CN102332601A CN201010600755A CN201010600755A CN102332601A CN 102332601 A CN102332601 A CN 102332601A CN 201010600755 A CN201010600755 A CN 201010600755A CN 201010600755 A CN201010600755 A CN 201010600755A CN 102332601 A CN102332601 A CN 102332601A
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- lithium ion
- ion battery
- cylindrical lithium
- top cover
- 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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- Sealing Battery Cases Or Jackets (AREA)
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 development of modern society, 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 has advantages such as high-energy-density, high working voltage and long life as a kind of environmental protection battery, and therefore the application in various mobile devices more and more widely.
See Fig. 1, shown in 2; Existing cylindrical lithium ion battery generally comprises battery container 11, has the pole piece group 12 of winding-structure; The pole piece group by positive plate, negative plate and be interval in positive plate and negative plate between barrier film reel and to form; Pole piece group 12 with winding-structure is packed in the battery container and is charged into electrolyte, then through battery cap 13 sealings.
Usually, the support platform that block 13 relies on slot rolling to form realizes being connected as a single entity and sealing through battery container 11 crimpings.Because of the support platform that slot rolling forms short and out-of-level; Seal in the process at crimping; Because pressing down, the faucal edge can cause block 13 to move down and walk; Burst disk 14 assemblies distortion in the block 13, the FAQs that causes because of the distortion of burst disk 14 assemblies is following: 1. cause the fluctuation of outage and pressure release value and become big, product comes into the market and is prone to potential safety hazard; 2. cushion rubber 15 decrements fluctuation causes the 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, necessary provide a kind of have good safety can cylindrical lithium ion battery.
Summary of the invention:
The object of the invention is exactly to the deficiency of prior art existence a kind of cylindrical lithium ion battery with good safety ability to be provided.
To achieve these goals, the technical scheme of the present invention's employing is:
Cylindrical lithium ion battery; It comprises battery container, be contained in the pole piece group in the battery container, electrolyte and the seal group that is filled in the battery container is connected to the block on the battery container; Block includes top cover; The periphery of top cover outwards is bent to form the bending step, and the bottom cover of top cover is provided with burst disk, and the periphery of burst disk is connected with the bottom seals of bending step.
As a kind of improvement of cylindrical lithium ion battery of the present invention, through laser welded seal, syndeton is firm, good airproof performance between said burst disk and the bending step.
A kind of improvement as cylindrical lithium ion battery of the present invention; The middle part of said bending step baseplane upwards has been recessed to form the ring-shaped step groove; The periphery of burst disk is arranged in the step groove; Burst disk stress deformation in having avoided sealing prevents that the explosion-proof tablet pressure relief value from becoming big even quick-fried and not opening, and reduces the generation of safety problems such as burning and blast.
As a kind of improvement of cylindrical lithium ion battery of the present invention, the diameter of said burst disk is preferably the external diameter 0.05～0.5mm of the diameter of burst disk less than step groove less than the external diameter of step groove, and the degree of depth of said 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 littler welding energy input of realization, obtains the bigger promptly bigger weld strength of fusion penetration, and can reduce the thermal deformation of assembly.
As a kind of improvement of cylindrical lithium ion battery of the present invention, be fixedly connected through rubber sealing between the periphery of said top cover and the battery container, sound construction, air-tightness is good.
Further improvement as cylindrical lithium ion battery of the present invention; Said cushion rubber coats the periphery of top cover, and with cushion rubber and top cover compacting sealing, closure part has only top cover, cushion rubber and housing to participate in to battery container by the inside pressing of cushion rubber outer surface; The stress point of top cover is outer; Can fall into the horizontal support section of housing slot rolling moulding, the housing flanging seal can guarantee in the enforcement indeformable, do not move, avoided the burst disk stress deformation.
A kind of improvement as cylindrical lithium ion battery of the present invention; The peripheral indentation of said bending step is formed with the recessed or last recessed protruding seal groove of epirelief; Sealing groove place is the stress point of fixing maximum in the process of sealing; And faying face improves the sealing of faying face not on same horizontal plane.
A kind of improvement as cylindrical lithium ion battery of the present invention; Be provided with the orifice plate that is positioned at pole piece group top in the said block, offer at least one pore on the orifice plate, 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 on burst disk and with burst disk through stomatal action, with the gas in the timely discharge battery, prevents the on fire or blast of battery.
Beneficial effect of the present invention is: it comprises battery container, be contained in the pole piece group in the battery container, electrolyte and the seal group that is filled in the battery container is connected to the top cover on the battery container; The periphery of top cover outwards is bent to form the bending step, and the bottom cover of top cover is provided with burst disk, and the periphery of burst disk is connected with the bottom seals of bending step; With respect to prior art; In the cylindrical lithium ion battery of the present invention, have only top cover, cushion rubber and housing to participate in being tightly connected in sealing, and the periphery upper and lower faces of top cover is provided with the sealed step groove; Therefore burst disk stress deformation in having avoided sealing; Prevent that the explosion-proof tablet pressure relief value from becoming big even quick-fried and not opening, reduce the generation of safety problems such as burning and blast, improve the lifting of stability, sealing, security performance and the volume space of cylindrical lithium ion battery.
Description of drawings:
Shown in Figure 1 is 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 block shown in Figure 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 block shown in Figure 3.
Embodiment:
Below in conjunction with accompanying drawing the present invention is further described:
See also Fig. 3 and shown in Figure 4; Cylindrical lithium ion battery of the present invention comprises: battery container 21, be contained in pole piece group 22 in the battery container 21, be filled in electrolyte (mark) and the battery cap 20 of sealed cell housing 21 in the battery container 21, block 20 includes top cover 23, burst disk 24, cushion rubber 25, orifice plate 26.The periphery of top cover 23 outwards is bent to form 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 the bottom of bending step 231 through laser welded seal.
Please be provided with the orifice plate 26 that is positioned at pole piece group 22 tops in the battery cap 20 especially with reference to shown in Figure 4, offer at least one pore 261 on the 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 surpassed scheduled pressure value, gas can act on the burst disk 24 and with burst disk 24 through pore 261 and tear, and with the gas in the timely discharge battery, prevented the on fire or blast of battery.
The preparation of positive plate: as positive active material, as conductive agent, make ethene as binding agent to gather inclined to one side difluoro with carbon black with LiCoO2, with N, N-dimethyl pyrrolidone (NMP) mixes the formation anode sizing agent as solvent with above-mentioned raw materials; Anode sizing agent is coated on the two sides of plus plate current-collecting body aluminium foil, after the drying, through positive plate rolling, that cutting forms preliminary dimension.
The preparation of negative plate: as negative electrode active material, make ethene as binding agent with graphite, as solvent, above-mentioned raw materials is mixed, form cathode size with NMP to gather inclined to one side difluoro; Cathode size is coated on the two sides of negative current collector Copper Foil, after the drying, through negative plate rolling, that cutting forms preliminary dimension.
The preparation of pole piece group 22: will be wound into pole piece group 22 through the volume pin according to positive plate, negative plate and the polyethylene barrier film of aforementioned prepared.
The preparation of cylindrical lithium ion battery: will place battery container 21 according to the pole piece group 22 of aforementioned prepared, and inject electrolyte, and, make cylindrical lithium ion battery of the present invention through battery cap 20 sealings.
Below in conjunction with Fig. 3 and shown in Figure 4, specify the block 20 of cylindrical lithium ion battery of the present invention.
The middle part of bending step 231 baseplanes of top cover 23 upwards has been recessed to form ring-shaped step groove 232; The periphery of burst disk 24 is arranged in the 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, and purpose is that the welding point with top cover 23 and burst disk 24 is designed to docking mode, and this mode is beneficial to the littler welding energy input of realization; Obtain the bigger promptly bigger weld strength of 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 the about 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 recessed or last recessed protruding seal groove 233 of epirelief.Sealing groove 233 places are the stress point of fixing maximum in the process of sealing, and faying face improves the sealing of faying face not on same horizontal plane.
Be sealedly and fixedly connected through cushion rubber 25 between the periphery of top cover 23 and the battery container 21, wherein, cushion rubber 25 coats the periphery of top cover 23, and battery container 21 is sealed cushion rubber 25 and top cover 23 compactings by the inside pressing of cushion rubber 25 outer surfaces.Closure part has only 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 do not have other assembly and coat except that 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; Housing 21 flangings seal can guarantee in the enforcement indeformable, do not move, avoided burst disk 24 stress deformations.
Structure of the present invention is suppressed test through gas, and pressure-resistant stopping property is air tight greater than 3.0Mpa.The 24H that puts upside down after falling for 9 times through 1 meter high concrete floor leaves standstill test, no leakage.Because of having cancelled the structure of burst disk 24 upper and lower surfaces coating top cover 23, top cover 23 thickness of the present invention have reduced by 30%.
According to the announcement and the instruction of above-mentioned specification, those skilled in the art in the invention can also carry out suitable change and modification to above-mentioned execution mode.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should fall in the protection range of claim of the present invention modifications more of the present invention and change.In addition, although used some specific terms in this specification, these terms are explanation for ease just, the present invention is not constituted any restriction.
Claims (10)
1. cylindrical lithium ion battery; It comprises battery container, be contained in the pole piece group in the battery container, electrolyte and the seal group that is filled in the battery container is connected to the block on the battery container; Block includes top cover; It is characterized in that: the periphery of said top cover outwards is bent to form the bending step, and the bottom cover of top cover is provided with burst disk, and the periphery of burst disk is connected with the bottom seals of bending step.
2. cylindrical lithium ion battery according to claim 1 is characterized in that: pass through laser welded seal between said burst disk and the bending step.
3. cylindrical lithium ion battery according to claim 1 is characterized in that: the middle part of said bending step baseplane upwards has been recessed to form the ring-shaped step groove, and the periphery of burst disk is arranged in the step groove.
4. cylindrical lithium ion battery according to claim 3 is characterized in that: the diameter of said burst disk is less than the external diameter of step groove.
5. cylindrical lithium ion battery according to claim 4 is characterized in that: the diameter of said burst disk is less than the external diameter 0.05～0.5mm of step groove.
6. cylindrical lithium ion battery according to claim 3 is characterized in that: the degree of depth of said step groove is less than or equal to the thickness of burst disk.
7. cylindrical lithium ion battery according to claim 1 is characterized in that: be fixedly connected through rubber sealing between the periphery of said top cover and the battery container.
8. cylindrical lithium ion battery according to claim 7 is characterized in that: said cushion rubber coats the periphery of top cover, and battery container is sealed cushion rubber and top cover compacting by the inside pressing of cushion rubber outer surface.
9. cylindrical lithium ion battery according to claim 1 is characterized in that: the peripheral indentation of said bending step is formed with the recessed or last recessed protruding seal groove of epirelief.
10. cylindrical lithium ion battery according to claim 1 is characterized in that: be provided with the orifice plate that is positioned at pole piece group top in the said block, offer at least one pore on the 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 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102332601A true CN102332601A (en) | 2012-01-25 |
| CN102332601B 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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| Country | Link |
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| CN (1) | CN102332601B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103531730A (en) * | 2012-07-02 | 2014-01-22 | 深圳市沃特玛电池有限公司 | Leak-proof cap for lithium-ion power battery |
| CN107359296A (en) * | 2017-07-24 | 2017-11-17 | 山东高佳新能源有限公司 | A kind of lithium battery module and its pressure relief device |
| 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 |
| 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 |
| WO2022110893A1 (en) * | 2020-11-24 | 2022-06-02 | 深圳市比克动力电池有限公司 | Cylindrical lithium battery |
Citations (6)
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| JP2002343316A (en) * | 2001-05-16 | 2002-11-29 | Matsushita Battery Industrial Co Ltd | Secondary battery and manufacturing method |
| 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 |
| 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 |
| CN101807674A (en) * | 2010-04-13 | 2010-08-18 | 天津三合意电子有限公司 | Lithium ion power battery cap and welding method thereof |
| CN201966290U (en) * | 2010-12-21 | 2011-09-07 | 东莞新能源科技有限公司 | Cylinder-type lithium ion battery |
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2010
- 2010-12-21 CN CN201010600755.7A patent/CN102332601B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002343316A (en) * | 2001-05-16 | 2002-11-29 | Matsushita Battery Industrial Co Ltd | Secondary battery and manufacturing method |
| CN2793932Y (en) * | 2005-05-13 | 2006-07-05 | 深圳粤宝电子工业总公司 | Explosive-proof cover of battery |
| 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 |
| CN101777634A (en) * | 2010-03-16 | 2010-07-14 | 周卫炳 | High-magnification cylindrical explosion-proof composite cap for lithium ion battery |
| CN101807674A (en) * | 2010-04-13 | 2010-08-18 | 天津三合意电子有限公司 | Lithium ion power battery cap and welding method thereof |
| CN201966290U (en) * | 2010-12-21 | 2011-09-07 | 东莞新能源科技有限公司 | Cylinder-type lithium ion battery |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103531730A (en) * | 2012-07-02 | 2014-01-22 | 深圳市沃特玛电池有限公司 | Leak-proof cap for lithium-ion power battery |
| CN107359296A (en) * | 2017-07-24 | 2017-11-17 | 山东高佳新能源有限公司 | A kind of lithium battery module and its pressure relief device |
| 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 |
| WO2022110893A1 (en) * | 2020-11-24 | 2022-06-02 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102332601B (en) | 2014-04-09 |
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