CN204946948U - A kind of lithium ion battery safe cap with fuse - Google Patents
A kind of lithium ion battery safe cap with fuse Download PDFInfo
- Publication number
- CN204946948U CN204946948U CN201520544913.XU CN201520544913U CN204946948U CN 204946948 U CN204946948 U CN 204946948U CN 201520544913 U CN201520544913 U CN 201520544913U CN 204946948 U CN204946948 U CN 204946948U
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- CN
- China
- Prior art keywords
- top cover
- fuse
- lithium ion
- ion battery
- conducting strip
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- 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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- 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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- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model provides a kind of lithium ion battery safe cap with fuse, comprise top cover, burst disk, insulating washer, orifice plate and sealing ring, described top cover comprises upper top cover and lower top cover, the marginal portion of described upper top cover and lower top cover is separated by the ring plate that insulate, leave space between core, in described space, be provided with the fuse be electrically connected with upper top cover and lower top cover.When electric current overrate, fuse blows thus cut off circuit, safety can be ensured in high rate charge-discharge situation.Relative to prior art, the utility model block adopts bi-layer tip cap design, does not affect the outward appearance of battery core; Electric current is confluxed by top cap central and flows through fuse, and during normal battery operation, uniformity of temperature profile, symmetry, improve battery security; Fuse uses the low-melting-point metal of column, and resistance is little, and energy consumption is low, extends the battery last operating time.
Description
Technical field
The utility model relates to technical field of lithium ion, particularly relates to the safe cap of the band fuse on a kind of cylindrical lithium ion battery.
Background technology
Lithium ion battery is high due to energy density, and the advantage such as to have extended cycle life is widely used.The extensive application of lithium ion battery makes its fail safe more and more be paid attention to, especially in large-scale application, as fields such as electric bicycle, electric automobile, energy-accumulating power stations.In Li-Ion rechargeable battery use procedure, overcharge, overdischarge and overcurrent all will affect battery and performance and safety.In lithium ion battery, place Electronic Protection circuit and device, can effectively protect battery overcharging, cross and put and overcurrent or improper use and damage.In actual applications, due to extraneous factor and device self reason, there is failure probability in the IC+MosFET of protection.If battery self does not have protective capability, once Electronic Protection lost efficacy, be quite dangerous for user.Just based on this; external safety test explicitly calls for; when lithium ion battery carries out the test of relevant safety; Electronic Protection must be removed; at this moment just realize defencive function by the passive device of battery in testing, when abnormal generation (high temperature/big current), can cut off/drag down electric current in time in the battery as passive protection device; avoid constant temperature to raise, thus stop dangerous generation.
In order to improve the fail safe of lithium ion battery, in the capping structure of lithium ion battery, positive temperature coefficient element PTC is used widely, but the use of PTC to a certain degree adds the internal resistance of lithium ion battery, is unfavorable for the use of battery under high current charge-discharge condition.As often not having PTC to protect in electric automobile application; but lithium ion battery needs security mechanism to protect battery itself under super-high-current and short-circuit conditions; simultaneously do not affect other battery cells, therefore need a kind of can safety-type block under high rate charge-discharge service condition.In rechargeable battery, fuse coordinates IC control loop effectively to monitor as overcurrent protection and prevents from producing infringement to battery; fuse, as over-current protection device, can be protected the big current of Li-Ion rechargeable battery in charge or discharge process and short circuit and cause cell damage.
Publication number is that the Patent Application Publication of CN101556993A discloses a kind of lithium ion battery combination block, it comprises: cushion rubber and installing and top cover, current fuse, burst disk, orifice plate and the insulation spacer in cushion rubber through hole, orifice plate is connected with solder joint with burst disk, insulation spacer is used for collecting and supports orifice plate, current fuse is connected between burst disk and top cover, when the electric current overrate of lithium ion battery, current fuse fuses and cuts off circuit.This current fuse comprises annular insulation film and sheet metal, and sheet metal comprises two annular conductive films connected by fuse link, and sheet metal walks around insulating trip in side, and two conducting strips fit in the two sides of insulating trip respectively, and fuse link is positioned at the side of insulating trip.Because this fuse is positioned at block side, CURRENT DISTRIBUTION can be caused uneven; The fuse link resistance of sheet type is large in addition, complex structure, poor practicability.
Utility model content
The purpose of this utility model is to provide a kind of lithium ion battery safe cap with fuse, when realizing the electric current overrate of lithium ion battery, fuse blows thus cut off circuit, safety can be ensured in high rate charge-discharge situation.
The utility model is achieved through the following technical solutions, lithium ion battery safe cap, comprise top cover, burst disk, insulating washer, orifice plate and sealing ring, described top cover comprises upper top cover and lower top cover, the marginal portion of described upper top cover and lower top cover is separated by the ring plate that insulate, leave space between core, in described space, be provided with the fuse be electrically connected with upper top cover and lower top cover.
Described fuse comprises the upper conducting strip at middle body and two ends and lower conducting strip, and described upper top cover and lower top cover clamp described fuse, are close to the upper conducting strip of fuse and lower conducting strip respectively.By upper and lower top cover clamping fuse, fuse can not be shifted, and easy for installation.
Preferred scheme, described body is cylindrical.This structure easy-formation, manufacture simple, and sectional area is large, resistance is little, and electric energy loss is low.
Because fuse material is softer, for preventing conducting strip and top cover from disconnecting, being provided with strutting piece between described upper conducting strip and lower conducting strip, utilizing strutting piece to be withstood by upper and lower conducting strip, making them be adjacent to upper and lower top cover all the time.In addition, when fuse blows, strutting piece can separate connecting up and down conducting strip, reaches the object cutting off circuit.
More preferred, described strutting piece is cylindrical, and conducting strip and lower conducting strip in two ends end face difference contact, center has the through hole passed through for described body.The strutting piece uniform force of this structure, can avoid conducting strip to be out of shape owing to being squeezed.
Preferred scheme, the sidewall of described strutting piece is provided with the breach entering central through hole for body.Breach is fan-shaped, and outer imperial palace is little, is convenient to assembling.
Preferred scheme, is electrically connected with positive temperature coefficient ring plate between described top cover and burst disk.The positive temperature coefficient ring plate component of conventional annular can be used flexibly, do not affect the operating chacteristics of the utility model safe cap, and add the fail safe of battery.Another technical scheme, safe cap of the present utility model does not use positive temperature coefficient ring plate, and battery, under high current charge-discharge condition, reduces the interior resistance of lithium ion battery.
Relative to prior art, the utility model has the following advantages: (1) adopts bi-layer tip cap design, does not affect the outward appearance of battery core, electric current is confluxed by top cap central and flows through fuse, during normal battery operation, uniformity of temperature profile, symmetry, improve battery security; (2) fuse uses the low-melting-point metal of column, and resistance is little, and energy consumption is low, extends the battery last operating time; (3) do not affect the Explosion-proof Design of battery cap, when interior voltage rise height, CID can normally open; (4) the utility model block is installed simple, is convenient to promote.
Accompanying drawing explanation
Fig. 1 is the utility model block cutaway view.
Fig. 2 is the vertical view of the upper top cover of block shown in Fig. 1.
Fig. 3 is for upper top cover shown in Fig. 2 is along the cutaway view of A-A line.
Fig. 4 is the cutaway view of the lower top cover of block shown in Fig. 1.
Fig. 5 is the cutaway view of the fuse of block shown in Fig. 1.
Fig. 6 is the vertical view of the strutting piece of block shown in Fig. 1.
Fig. 7 is the cutaway view of the burst disk of block shown in Fig. 1.
Fig. 8 is the vertical view of the orifice plate of block shown in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail.
As Fig. 1, the utility model lithium ion battery safe cap comprises upper top cover 1, sealing ring 2, fuse 3, lower top cover 4, insulation ring plate 5, PTC ring plate 6, burst disk 7, insulating washer 8 and orifice plate 9.
As Fig. 2 and Fig. 3, upper top cover 1 is step disk, is provided with an annular base portion 10, and the annular inboard edge of base portion 10 raises up and forms rake 12 and plane circular top 13, rake 12 offers air-vent 11.
As shown in Figure 4, lower top cover 4 is step disk, be similar to upper top cover 1, be provided with an annular base portion 40 equally, the annular inboard edge of base portion 40 raises up and forms rake 42 and plane circular top 43, and rake 42 offers air-vent 41, the angle of inclination of rake 42 is less than rake 12, make to reserve the space holding fuse 3 between upper top cover 1 and lower top cover 4 core, the marginal portion of upper top cover 1 and lower top cover 4 is separated by insulation ring plate 5.During installation, the air-vent of upper top cover 1 and lower top cover 4 aligns, not affect the release of battery pressure when losing efficacy.
As shown in Figure 5, fuse 3 is made up of the low-melting-point metals such as lead, antimony, tin and alloy thereof or alloy, is made up of upper conducting strip 31, body 33 and lower conducting strip 34.Upper and lower conducting strip is circular metal plate, and the planar rondure top of diameter and top cover is suitable, and body 33 is cylinder.During installation, fuse 3 is fixedly clamped by upper and lower top cover, and the planar rondure top of upper and lower top cover is close to by upper and lower conducting strip.
Because conducting strip thickness is little, when upper and lower top cover clamping, yielding, cause loose contact, between upper and lower conducting strip, be provided with strutting piece 32, as shown in Figure 6, strutting piece 32 is hollow circular cylinder, and there is the through hole 321 passed through for body 33 at center, and sidewall has the breach 322 entering through hole for body, breach 322 is in fan-shaped, and outer imperial palace is little.During installation, two end faces of strutting piece 32 support upper and lower conducting strip respectively, ensure that they are close to top cover.
As shown in Figure 1, sealing ring 2 comprises blind end 21, keeps end 22 and the rake 24 be connected, and what wherein diameter was larger is blind end 21, and what diameter was less is maintenance end 22.Cavity 23 is offered in the inside of sealing ring 2, the diameter at cavity 23 blind end 21 place and the external diameter of upper top cover 1 suitable.
As shown in Figure 7, burst disk 7 is step disk, is provided with thinner bending part 73 between its outer shroud 71 and connecting portion 72, stressedly easily to disconnect herein afterwards.The central authorities being positioned at burst disk 7 are provided with circular projection 74.PTC ring plate 6 is provided with between lower top cover 4 and burst disk 7.
As illustrated in figures 1 and 8, orifice plate 9 is the circular lamellar body of step, and be provided with insulating washer 8 between it and burst disk 7, orifice plate 9 outer rim has flange 94, and flange 94 matches with the maintenance end 22 of sealing ring 2.The central concave of orifice plate 9 lower surface forms a groove 91, and groove 91 is for connecting anode ear.The center of orifice plate 9 is the solder joint 92 that thickness is very little.Orifice plate 9 is also provided with pore 93.
During installation, first strutting piece 32 is enclosed within the body 33 of fuse, then orifice plate 9, insulating washer 8, burst disk 7, PTC ring plate 6, lower top cover 4, insulation ring plate 5 are loaded in the cavity 23 of sealing ring 2 successively, again fuse 3 is placed on lower top cover 4 top 43, secondly upper top cover 1 is loaded in the cavity 23 of sealing ring 2, and the projection 74 of burst disk 7 is welded together with the form of spot welding with the solder joint 92 of orifice plate 9.Insulate in orifice plate 9 and the region of burst disk 7 beyond solder joint 92.The path of electric current in combination cover cap is: flow to burst disk 7 through orifice plate 9 by solder joint 92, then flows to the lower conducting strip 34 of fuse 3 from PTC ring plate 6, lower top cover 4, through fuse 33, upper conducting strip 31, flows to external circuit finally by upper top cover 1.
During jaw, bending is out of shape by the blind end 21 of sealing ring 2 under the extruding of box hat, thus the annular base 10 of stuck fast upper top cover 1, thus by inside battery and isolation.
When lithium ion battery normally works, described fuse 3 generates heat not high.When lithium ion battery discharge and recharge or short circuit, inner or external short circuit and produce big current time, electric current is cut off in fusing by the body 33 of fuse 3, plays the effect of protection cell safety.
When internal temperature of battery is too high so that gas expansion time, gas enters between orifice plate 9 and burst disk 8 from the pore 93 of orifice plate 9; When pressure reaches certain value, the solder joint 92 between burst disk 8 and orifice plate 9 will be disconnected, and make the open circuit of lithium ion battery circuit and stop heating up; If gas pressure continues to increase, then can promote burst disk 7 and disconnect at bending part 73, gas is discharged, to ensure that lithium ion battery does not catch fire or explodes from the air-vent of lower top cover 4 and upper top cover 1.
Claims (6)
1. a lithium ion battery safe cap, comprise top cover, burst disk, insulating washer, orifice plate and sealing ring, it is characterized in that, described top cover comprises upper top cover and lower top cover, the marginal portion of described upper top cover and lower top cover is separated by the ring plate that insulate, leave space between core, in described space, be provided with the fuse be electrically connected with upper top cover and lower top cover.
2. lithium ion battery safe cap as claimed in claim 1, it is characterized in that, described fuse comprises the upper conducting strip at middle body and two ends and lower conducting strip, and described upper top cover and lower top cover clamp described fuse, are close to the upper conducting strip of fuse and lower conducting strip respectively.
3. lithium ion battery safe cap as claimed in claim 2, it is characterized in that, described body is cylindrical.
4. lithium ion battery safe cap as claimed in claim 2, is characterized in that, be provided with strutting piece between described upper conducting strip and lower conducting strip.
5. lithium ion battery safe cap as claimed in claim 4, it is characterized in that, described strutting piece is cylindrical, and conducting strip and lower conducting strip in two ends end face difference contact, center has the through hole passed through for described body.
6. lithium ion battery safe cap as claimed in claim 5, is characterized in that, the sidewall of described strutting piece is provided with the breach entering central through hole for body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520544913.XU CN204946948U (en) | 2015-07-24 | 2015-07-24 | A kind of lithium ion battery safe cap with fuse |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520544913.XU CN204946948U (en) | 2015-07-24 | 2015-07-24 | A kind of lithium ion battery safe cap with fuse |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204946948U true CN204946948U (en) | 2016-01-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520544913.XU Expired - Fee Related CN204946948U (en) | 2015-07-24 | 2015-07-24 | A kind of lithium ion battery safe cap with fuse |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204946948U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106898724A (en) * | 2017-03-06 | 2017-06-27 | 安普能源科技有限公司 | Power battery over-temperature fusing protection technology with strong overcurrent capacity |
| CN106941147A (en) * | 2017-03-06 | 2017-07-11 | 安普能源科技有限公司 | Safe lithium battery pack with battery cells connected by constant-temperature heating and connection method |
| WO2018192072A1 (en) * | 2017-04-17 | 2018-10-25 | 安普能源科技有限公司 | Lithium-ion power battery thermal protection connection structure and connection method therefor |
| CN109088012A (en) * | 2018-07-16 | 2018-12-25 | 天津力神电池股份有限公司 | A kind of high-power lithium ion circular battery lid |
-
2015
- 2015-07-24 CN CN201520544913.XU patent/CN204946948U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106898724A (en) * | 2017-03-06 | 2017-06-27 | 安普能源科技有限公司 | Power battery over-temperature fusing protection technology with strong overcurrent capacity |
| CN106941147A (en) * | 2017-03-06 | 2017-07-11 | 安普能源科技有限公司 | Safe lithium battery pack with battery cells connected by constant-temperature heating and connection method |
| WO2018192072A1 (en) * | 2017-04-17 | 2018-10-25 | 安普能源科技有限公司 | Lithium-ion power battery thermal protection connection structure and connection method therefor |
| CN109088012A (en) * | 2018-07-16 | 2018-12-25 | 天津力神电池股份有限公司 | A kind of high-power lithium ion circular battery lid |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 313100 Huzhou Province, Changxing County, painted Creek Industrial Park, Bao bridge road, No. 18 Patentee after: Zhejiang energy energy Polytron Technologies Inc Address before: 313100 Huzhou Province, Changxing County, painted Creek Industrial Park, Bao bridge road, No. 18 Patentee before: Zhejiang Tianneng Energy Technology Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160106 Termination date: 20180724 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |