CN201562701U - Explosion-proof cover structure for lithium ion battery - Google Patents
Explosion-proof cover structure for lithium ion battery Download PDFInfo
- Publication number
- CN201562701U CN201562701U CN2009203147623U CN200920314762U CN201562701U CN 201562701 U CN201562701 U CN 201562701U CN 2009203147623 U CN2009203147623 U CN 2009203147623U CN 200920314762 U CN200920314762 U CN 200920314762U CN 201562701 U CN201562701 U CN 201562701U
- Authority
- CN
- China
- Prior art keywords
- explosion
- bound edge
- proof
- covering board
- proof covering
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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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
- 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
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model relates to an explosion-proof cover structure for lithium ion battery, which comprises an upper cover board, an anti-explosion cover board, an edge enclosing ring, an edge enclosing explosion-proof sheet. A concave slot is made from the upper cover board at the position of the explosion-proof cover board, and an explosion-proof hole is coaxially made at the center of the concave slot. A edge enclosing ring is sealingly mounted inside the concave slot, which is entirely welded to the upper cover board at the position of the welding line by adopting the laser welding. An edge enclosing explosion-proof sheet is embedded in the enclosed edges of the edge enclosing ring, an enclosed sealing line is produced at the bottom of the edge enclosing explosion-proof sheet, and a ring of nicks are provided on the edge enclosing explosion-proof sheet on the inner side of the sealing line. The explosion-proof cover board is coaxially embedded inside the enclosed edges of the edge enclosing explosion-proof sheet, openings are also provided at the position of the vertical edge of the explosion-proof board. The utility model uses plastic material of the anti-electrolytic liquid as the explosion-proof sheet, and uses explosion-resistant nicks and sealing lines of the injection mold in the explosion-proof sheet, so that problems of unsteady explosion pressure, bad sealingness and low strength of the explosion-proof sheet are overcome.
Description
Technical field
The utility model belongs to field of batteries, especially a kind of explosion-proof covering board structure of lithium ion battery.
Background technology
The domestic in recent years new forms of energy of greatly developing are used, and lithium ion battery is the fine power resource that substitutes existing petroleum-based energy of a kind of energy.Lithium ion battery has high-energy-density, high voltage, pollution-free, characteristics such as containing metal lithium, cycle life height, charging rate be not fast, is widely used in equipment such as electric bicycle, electric automobile, electric tool, laptop computer, mobile phone, digital camera.But lithium ion battery when improper use, as overcharge, short circuit, overheated etc., it is inner can to produce gas and cause that cell internal pressure increases, and the possibility of blasting is arranged.So lithium ion battery also usually installs safety valve additional to battery except installing additional in use the protection circuit when design.Present safety valve has mainly used following a few class, one class is to adopt the mode of punching press to form, the indentation of this mode a little less than stamping out relative thin on the cover plate of battery or the housing, but be difficult to assessment owing to reasons such as control precision make explosion-proof pressure, cause the explosion-proof pressure consistency relatively poor.An other class is the disclosed a kind of battery cover board of CN1400678, this cover plate adopts ultrasonic bond that foil is welded on the cover plate, this covering plate structure is simple, explosion-proof pressure is stable, but because of the welding reason causes sealing property relatively poor, and because the too thin breakage that very easily causes in cover plate processing, transportation, the use of foil causes entire cell to be scrapped.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art part, and the explosion-proof covering board structure of the lithium ion battery of a kind of favorable sealing property, security performance height, long service life is provided.
The utility model realizes that the technical scheme of purpose is:
A kind of explosion-proof covering board structure of lithium ion battery comprises upper cover plate, explosion-proof covering board and burst disk, it is characterized in that:
(1) on the upper cover plate of explosion-proof covering board position, makes a groove, the coaxial explosionproof hole of making in this groove center;
(2) be sealed and installed with a bound edge ring in groove, this bound edge ring adopts laser welding and upper cover plate, and whole circle welds at the sealing wire place;
(3) burst disk of setting-in one bound edge in the bound edge of bound edge ring is shaped on a circle indentation at the bound edge burst disk bottom surface of upper cover plate groove location;
(4) coaxial setting-in explosion-proof covering board in the bound edge of bound edge burst disk, the stile place of this explosion-proof covering board is uniform to be shaped on perforate.
And the outer lower bottom part of described bound edge burst disk indentation is shaped on the potted line of a sealing.
And the cross sectional shape of described potted line is semicircle, or the shape that combines of oval, square or rectangle and above-mentioned shape.
And the cross sectional shape of described indentation is a triangle, or the shape that combines of oval, square or rectangle and above-mentioned shape, and the bound edge burst disk is 0.05-0.3MM in the residual thickness of indent locations.
Advantage of the present utility model and good effect are:
The lithium ion battery explosion-proof covering plate structure that the utility model is related, adopted the plastic material of anti-electrolyte to make burst disk, and the explosion-proof indentation and the potted line of employing injection mo(u)lding in burst disk, the installation of bound edge mode has improved the sealing of battery, thereby has overcome explosion-proof pressure instability, sealing difference and the low problem of burst disk intensity.
Description of drawings
Fig. 1 is the structural front view of lithium ion battery of the present utility model;
Fig. 2 is the lithium ion battery upper cover plate of Fig. 1 and the cross-section structure enlarged diagram of explosion-proof covering board.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is further specified; Following embodiment is illustrative, is not determinate, can not limit protection range of the present utility model with following embodiment.
A kind of explosion-proof covering board structure of lithium ion battery, as shown in Figure 1 and Figure 2, upper cover plate 3 is provided with explosion-proof covering board 2, positive terminal 1 and negative terminal 4, and explosion-proof covering board is between positive terminal and negative terminal.The concrete structure of explosion-proof covering board is combined by explosion-proof covering board, bound edge ring 5, bound edge burst disk 6 referring to the structure amplification view of Fig. 2, wherein:
1, on the upper cover plate of explosion-proof covering board position, make a round recessed, the coaxial explosionproof hole 7 of making in this groove center,
2, in groove, be sealed and installed with the bound edge ring, this bound edge ring is shaped on central through hole, the diameter of this central through hole is greater than the explosionproof hole of groove, and the last plane of bound edge ring flushes with upper cover plate, adopt laser welding with bound edge ring and upper cover plate at sealing wire 8 places whole circle weldering live.
3, setting-in bound edge burst disk in the bound edge of bound edge ring, the material of bound edge burst disk are that PP, PE, PFA, PET reach the alloy plastic material with above-mentioned material matrix; The lower bottom part of this bound edge burst disk is shaped on the potted line 9 of a sealing, and the cross sectional shape of sealing line is the semicircle shown in the present embodiment accompanying drawing, also can be oval, square or the shape that combines of rectangle and above-mentioned shape; On the bound edge burst disk of potted line inboard, be shaped on a circle indentation 10, the cross section of this indentation is the triangle shown in the present embodiment accompanying drawing, also can be oval, square or the shape that combines of rectangle and above-mentioned shape, the bound edge burst disk be 0.05-0.3MM in the residual thickness of indent locations.
4, coaxial setting-in explosion-proof covering board in the bound edge of bound edge burst disk, the stile place of this explosion-proof covering board is uniform to be shaped on perforate, and the present embodiment accompanying drawing is depicted as four.The material of explosion-proof covering board has no particular limits, and can adopt aluminium alloy, aluminium, stainless steel, nickel or nickel alloy etc. conventional in the prior art.
Narrate manufacture method of the present utility model below by an instantiation:
1, goes out upper cover plate with impact style earlier, on upper cover plate, go out groove and explosionproof hole simultaneously;
2, make explosion-proof covering board and bound edge ring with impact style respectively, the external diameter of bound edge ring is same as the groove internal diameter of upper cover plate, material thickness 0.3MM, and the bound edge ring is suitable for reading to be upright; The external diameter of explosion-proof covering board is than the little 0.8MM of bound edge ring internal diameter, height 3.0MM, and its hole shape is that square four holes of 4.0*4.0 are uniform; Make the bound edge burst disk with PP material with the injection moulding mode again, the external diameter of burst disk is with the internal diameter of bound edge ring, the even 0.4MM of thickness, bottom potted line high by 0.8, wide 1.2; By shown in Figure 2, explosion-proof covering board, burst disk, bound edge ring are installed and adopt the groove that is installed on upper cover plate after the riveted joint mode sealing and fixing, compress potted line, bound edge ring and upper cover plate are put in order the circle weldering firmly at the sealing wire place, can finish the installation of explosion-proof covering board and make with laser welding.
In actual use, since the bound edge burst disk that the utility model has adopted plastic material with and on potted line, even under the long-term vibration environment, can not influence the intensity of burst disk and the sealing of upper cover plate yet, when cell internal pressure surpasses the pressure that the burst disk indentation born, burst disk will be broken, pressure is discharged, thereby avoided battery explosion, guaranteed the fail safe of battery.
Do 10 battery testing sealings and explosion-proof pressure as stated above.
| Sequence number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 |
| Fracture pressure (MP) | 0.95 | 1.05 | 1.03 | 0.92 | 0.88 | 1.02 | 0.99 | 0.89 | 0.93 | 0.95 |
| Air-tightness (0.8MP) | OK | OK | OK | OK | OK | OK | OK | OK | OK | OK |
The sealing and the fail safe of existing lithium ion battery have been well positioned to meet by above data.
Claims (4)
1. the explosion-proof covering board structure of a lithium ion battery comprises upper cover plate, explosion-proof covering board and burst disk, it is characterized in that:
⑴ make a groove on the upper cover plate of explosion-proof covering board position, the coaxial explosionproof hole of making in this groove center;
⑵ be sealed and installed with a bound edge ring in groove, this bound edge ring adopts laser welding and upper cover plate, and whole circle welds at the sealing wire place;
⑶ the burst disk of setting-in one bound edge in the bound edge of bound edge ring is shaped on a circle indentation at the bound edge burst disk bottom surface of upper cover plate groove location;
⑷ in the bound edge of bound edge burst disk coaxial setting-in explosion-proof covering board, and the stile place of this explosion-proof covering board is uniform to be shaped on perforate.
2. the explosion-proof covering board structure of lithium ion battery according to claim 1 is characterized in that: the outer lower bottom part of described bound edge burst disk indentation is shaped on the potted line of a sealing.
3. the explosion-proof covering board structure of lithium ion battery according to claim 2 is characterized in that: the cross sectional shape of described potted line is for semicircle, or the shape that combines of oval, square or rectangle and above-mentioned shape.
4. the explosion-proof covering board structure of lithium ion battery according to claim 1, it is characterized in that: the cross sectional shape of described indentation is a triangle, or the shape that combines of oval, square or rectangle and above-mentioned shape, the bound edge burst disk is 0.05-0.3MM in the residual thickness of indent locations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203147623U CN201562701U (en) | 2009-11-13 | 2009-11-13 | Explosion-proof cover structure for lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009203147623U CN201562701U (en) | 2009-11-13 | 2009-11-13 | Explosion-proof cover structure for lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201562701U true CN201562701U (en) | 2010-08-25 |
Family
ID=42627854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009203147623U Expired - Fee Related CN201562701U (en) | 2009-11-13 | 2009-11-13 | Explosion-proof cover structure for lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201562701U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005549A (en) * | 2010-10-27 | 2011-04-06 | 杨学新 | Explosion-proof combined cap of high-power battery |
| CN103915586A (en) * | 2014-04-04 | 2014-07-09 | 深圳市科达利实业股份有限公司 | Power battery cover plate and substrate thereof |
| CN108198967A (en) * | 2017-12-28 | 2018-06-22 | 中国科学院宁波材料技术与工程研究所 | A kind of power battery and its cap structure |
| CN110707262A (en) * | 2019-08-13 | 2020-01-17 | 力赛凡科技有限公司 | Explosion-proof ventilation valve of power battery and battery system using same |
-
2009
- 2009-11-13 CN CN2009203147623U patent/CN201562701U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005549A (en) * | 2010-10-27 | 2011-04-06 | 杨学新 | Explosion-proof combined cap of high-power battery |
| CN103915586A (en) * | 2014-04-04 | 2014-07-09 | 深圳市科达利实业股份有限公司 | Power battery cover plate and substrate thereof |
| CN103915586B (en) * | 2014-04-04 | 2018-03-20 | 深圳市科达利实业股份有限公司 | Cover plate of power battery and its substrate |
| CN108198967A (en) * | 2017-12-28 | 2018-06-22 | 中国科学院宁波材料技术与工程研究所 | A kind of power battery and its cap structure |
| CN108198967B (en) * | 2017-12-28 | 2021-02-02 | 中国科学院宁波材料技术与工程研究所 | Power battery and top cover structure thereof |
| CN110707262A (en) * | 2019-08-13 | 2020-01-17 | 力赛凡科技有限公司 | Explosion-proof ventilation valve of power battery and battery system using same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100825 Termination date: 20171113 |