CN201438449U - Current fuse and power battery - Google Patents
Current fuse and power battery Download PDFInfo
- Publication number
- CN201438449U CN201438449U CN2009201324572U CN200920132457U CN201438449U CN 201438449 U CN201438449 U CN 201438449U CN 2009201324572 U CN2009201324572 U CN 2009201324572U CN 200920132457 U CN200920132457 U CN 200920132457U CN 201438449 U CN201438449 U CN 201438449U
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- Prior art keywords
- elastic sheet
- electroconductive elastic
- electric conductor
- current fuse
- conductor
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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 utility model belongs to the technical field of power battery safety and provides a current fuse. The current fuse comprises an insulation box body, a first conductor, a second conductor, a first conduction elastic sheet and a second conduction elastic sheet, wherein the insulation box body is provided with a cavity; the first conductor and the second conductor are fixed with the insulation box body, the outer ends of the first conductor and the second conductor extend out of the insulation box body, and the inner ends thereof are positioned in the cavity; the first conduction elastic sheet and the second conduction elastic sheet are positioned in the cavity, the outer ends of the first conduction elastic sheet and the second conduction elastic sheet are fixedly and electrically connected with the inner ends of the first conductor and the second conductor, and the inner ends of the first conduction elastic sheet and the second conduction elastic sheet are welded with each other in a pushing-against way; and the first conduction elastic sheet or the second conduction elastic sheet has the elastic potential energy leaving the welding spot. The utility model discloses a power battery provided with the current fuse. For the current fuse, the welding spot can be melted partly when in short circuit, the first conduction elastic sheet and the second conduction elastic sheet can flicked away toward the opposite directions by virtue of the self-elasticity, so as to realize the protection for the battery and have very high disconnection reliability.
Description
Technical field
The utility model relates to electrokinetic cell safe practice field, more particularly, and the electrokinetic cell that relates to a kind of current fuse and have this current fuse.
Background technology
Day by day exhausted in non-renewable resources such as oil, under the serious all the more background of environmental pollution, people express very big expectation to new-energy automobile.Electrokinetic cell then is the heart of new-energy automobile, and it is storing huge electric energy.Because the mobility that has of automobile and the uncertainty of outdoor road conditions guarantee that the safety of electrokinetic cell becomes problem demanding prompt solution, especially to the short-circuit protection of electrokinetic cell.
Please refer to Fig. 1, in order to realize short-circuit protection to electrokinetic cell, the way of prior art be the welding manner at cell 2 ' employing lug butt joint, overlap joint be provided with fusing structure (fuse) 1 '.When cell 2 ' when being short-circuited, electric current be about to fuse structure 1 ' the solder joint fusing, the melt after the fusing comes off under the effect of gravity, thereby realizes the short circuit to electrokinetic cell.
But the defective of this way is: the reliability that the fusing structure disconnected when short circuit took place is not enough.Weld after the fusing structure 1 ' design, cell 2 ' be assembled into power brick with cell 2 ' employing integral type.Like this, cell 2 ' between inevitably can have stress.The high temperature that electric current produces during short circuit can make be connected and fixed cell 2 ' backing plate softening; cell 2 ' the position can stress release and be moved; may make the fusing structure 1 that this has disconnected ' overlap again, thereby lose the effect of short-circuit protection.And actual application also shows, the fusing structure 1 of employing butt joint and overlapping mode setting ' because weld seam is little and stress release causes moving of cell 2 ' position, make in most cases, though fusing structure 1 ' the solder joint fusing but still can not effectively disconnect.
The utility model content
Technical problem to be solved in the utility model is: it is unreliable that existing fusing structure disconnects when opening circuit, thereby a kind of current fuse that has good disconnection reliability when short circuit takes place is provided.
A kind of current fuse, it comprises the insulation box body with cavity, electric conductor, and electroconductive elastic sheet; Electric conductor comprises first electric conductor and second electric conductor, and electroconductive elastic sheet comprises first electroconductive elastic sheet and second electroconductive elastic sheet; First, second electric conductor is fixed with the insulation box body, and it is external that insulation booth is extended in its outer end, and its inner is positioned at cavity; First, second electroconductive elastic sheet is positioned at cavity, and its outer end fixedly is electrically connected with the inner of first, second electric conductor, and its inner is welded together by precompressed; The elastic potential energy that breaks away from solder joint when first electroconductive elastic sheet and/or second electroconductive elastic sheet have short circuit.
Second purpose of the present utility model provides a kind of electrokinetic cell, comprises at least two cells, is electrically connected between the cell, is electrically connected by at least one current fuse provided by the utility model between the cell.
Current fuse provided by the utility model; when short circuit takes place; because electric current is very big; moment produces a large amount of heat at the solder joint position that welding forms and has little time to distribute, and the thermal capacitance at solder joint position is very little, therefore can make the solder joint fusing in very short time; first, second electroconductive elastic sheet overcomes the surface tension and the external drag of welding material by self elastic force; flick round about, thereby realization has very high disconnection reliability to the protection of battery.
Description of drawings
Fig. 1 is the partial structurtes schematic diagram that the fusing structure is set between cell in the prior art;
Fig. 2 is the utility model is provided with the fusing structure between cell a partial structurtes schematic diagram;
Fig. 3 is the decomposition texture schematic diagram of the utility model one preferred embodiment;
Fig. 4 is the electric conductor and the electroconductive elastic sheet schematic diagram of the utility model one preferred embodiment;
Fig. 5 is the vertical view of the utility model one preferred embodiment;
Fig. 6 is along the cutaway view (under the normal operating conditions) of A-A line among Fig. 5;
Fig. 7 is along the cutaway view (under the short circuit off-state) of A-A line among Fig. 5.
Embodiment
In order to make technical problem to be solved in the utility model, technical scheme and beneficial effect clearer,, the utility model is further elaborated below in conjunction with drawings and the specific embodiments.
As shown in Figure 3, a kind of current fuse, it comprises the insulation box body 1 with cavity 10, first, second electric conductor 21,22, and first, second electroconductive elastic sheet 31,32;
First, second electric conductor 21,22 and insulation box body 1 are fixing, and extend outside the insulation box body 1 its outer end, and its inner is positioned at cavity 10; First, second electroconductive elastic sheet 31,32 is positioned at 10 cavitys, and its outer end fixedly is electrically connected with the inner of first, second electric conductor 21,22, and its inner is welded together by precompressed; The elastic potential energy that breaks away from solder joint when first electroconductive elastic sheet 31 and/or second electroconductive elastic sheet 32 have short circuit.
Wherein, precompressed welding being meant to exert pressure on first, second electroconductive elastic sheet 31,32 and overcoming they self elastic force generation elastic deformation, and first, second electroconductive elastic sheet is welded together.Wherein welding is preferably solder.
Below above-mentioned each part is described in detail respectively.
Referring to Fig. 3, wherein, insulation box body 1 comprises upper cover plate 11, main casing 12, lower cover 13, and upper cover plate 11, lower cover 13 are fixed on the main casing 12, and encloses formation inner chamber 10 with main casing 12; Electric conductor extends out between upper cover plate 11 and main casing 12, and by upper cover plate 11 and main casing 12 clampings.
11 one-tenth half-surroundeds of upper cover plate are made up of upper surface and dual-side.Upper surface covers main casing 12, and dual-side and main casing 12 be first, second electric conductor 21,22 of clamping together.Main casing 12 is a hollow structure, and the two ends of main casing 12 are provided with the standing groove that first, second electric conductor 21,22 of two confessions is fixed.Be equipped with screwed hole on upper cover plate 11, main casing 12, the lower cover 13, be used for the connection between them and fix first, second electric conductor 21,22.
The insulation cell material adopts high temperature resistant, corrosion-resistant material.For example pottery, asbestos, polytetrafluoroethylene etc.
Owing to adopt the stand alone type design, the rigidity of its insulation box body is enough to overcome because the existence of Installation Stress between cell is moved the position that produces when the high temperature backing plate is softening, has shielded external cause and has caused the factor that can not effectively disconnect.
Preferably, first electric conductor 21 and first electroconductive elastic sheet 31 are structure as a whole, and second electric conductor 22 and second electroconductive elastic sheet 32 are structure as a whole.Wherein integrative-structure can constitute for the composite material of xenogenesis material for constituting with material also.
As shown in Figure 7, (under the situation about promptly not stressing) is bent downwardly under first electroconductive elastic sheet, 31 natures, is bent upwards under second electroconductive elastic sheet, 32 natures; First electroconductive elastic sheet is parallel with second electroconductive elastic sheet.When welding, first electroconductive elastic sheet 31 and second electroconductive elastic sheet 32 are pressed onto the plane at first, second electric conductor 21,22 places, become shape shown in Figure 6.
Better embodiment of the present utility model during all crooked deformation of electroconductive elastic sheet is even a crooked deformation in first, second electroconductive elastic sheet 31,32 fully also can realize the purpose of this utility model.Certainly, with straight under the nature and the electroconductive elastic sheet in a plane not, bend and weld together also and can realize the purpose of this utility model.
First, second electroconductive elastic sheet 31,32 can be laminated structure.Preferably can also divide shell fragments, become finger as shown in Figure 4 for, first electroconductive elastic sheet 31 comprises at least two conductions; Accordingly, second electroconductive elastic sheet 32 also comprises at least two conduction branch shell fragments.
The material of electroconductive elastic sheet can be elastic conducting material, and for example beryllium-bronze, phosphor bronze also can be composite material, for example composite board of elasticity copper material and red copper/aluminium.The all preferred beryllium copper shell fragment of first, second electroconductive elastic sheet 31,32 of the present utility model, the beryllium copper shell fragment has thermal conductive resin, conductivity and elasticity, and has good creep-resistant property.
The present invention also preferably is filled with the arc-extinguishing medium (not shown) in described cavity 10.When the moment that first, second electroconductive elastic sheet 31,32 disconnects, voltage is very big between them, can produce very strong arcing, owing under normal circumstances just may produce some fuel gas, the amount that produces fuel gas in the time of short circuit is bigger, the high temperature that arcing produces is enough to ignited flammable gas, causes potential safety hazard.In above-mentioned cavity, be filled with arc-extinguishing medium, can carry out the arc extinguishing protection effectively, reduce battery hidden danger.
The preferred arc-extinguishing medium of the utility model is a quartz sand.Quartz sand is electronegativity, has thermal conductivity and insulation property preferably, can flick moment at shell fragment and be filled between the shell fragment, reaches good arc quenching effect, is one of arc quenching material of using always.
Conduction of the present utility model is divided elastic piece structure, on the one hand helps reducing the conductive area of electroconductive elastic sheet, thereby increases the resistance of electroconductive elastic sheet, and when big electric current, local temperature raises very fast, and solder joint in time melts fracture, shortens the response time of open circuit protection.On the other hand, when in cavity, being filled with arc-extinguishing medium, conduction is divided elastic piece structure, because self drag area is less, thereby reduce the resistance of quartz sand to electroconductive elastic sheet, quartz sand is subjected to conducting electricity the pressure of branch shell fragment, divide slit between the shell fragment by adjacent conductive, flow to relative conduction and divide between the shell fragment, both helped the resistance of timely venting quartz sand, can make quartz sand be filled into timely arc extinguishing between two electroconductive elastic sheets fast again electroconductive elastic sheet.
Preferably, electric conductor is a laminated structure, and the thickness of electroconductive elastic sheet is less than the thickness of electric conductor.
So both can reduce the conductive area of electroconductive elastic sheet, increase the resistance of electroconductive elastic sheet; Can increase whole conductive area again, reduce whole resistance.When electric current more as a child, heating power is less, though the resistance of electroconductive elastic sheet part is bigger, but because electroconductive elastic sheet is because its good thermal conductivity, time enough carries out heat conduction and thermal radiation to space in the cavity or quartz sand, heat is in time distributed, so the temperature with whole is identical substantially for electroconductive elastic sheet.Can guarantee like this that under the normal current situation current fuse can operate as normal and the conducting of maintenance high efficiency.And under short-circuit conditions, because electric current is very big, the electroconductive elastic sheet local electrical resistance is bigger, and moment produces a large amount of heat, have little time to scatter and disappear at all, therefore and electroconductive elastic sheet self thermal capacitance is very little, and temperature reaches the fusing point of solder joint melt, solder joint fusing in very short time, electroconductive elastic sheet is under the effect of its elastic stress, overcome bath surface liquid tension and external drag and disconnect good reliability, response time weak point.
More preferably, the ratio of the resistance of the resistance of electroconductive elastic sheet and electric conductor is 1.5-2.5.Can make the conduction and the response time of current fuse be in preferable level like this.
Relative prior art, the utility model can be independent from the power brick production link with it owing to adopt freestanding structure, and batch process can effectively enhance productivity, improve consistency of product and reduce production costs.It as a member independently, is improved the operability of producing and safeguarding.
Describe below in conjunction with experiment, first, second electric conductor 21,22 of experiment exemplar is of a size of 40 * 2mm for conductive section
2Beallon, first, second electroconductive elastic sheet are that 4 conductive sections are of a size of 4 * 0.5mm
2Conduction divide shell fragment, it is 2mm that conduction is divided the spacing between the shell fragment.
The overall electrical resistance of current fuse is the 0.1-0.2 milliohm, and electroconductive elastic sheet (part) resistance is the 0.05-0.1 milliohm.Under the situation of 350A overload, current fuse can guarantee 15 minutes overload at least; Under the 1000A short-circuit conditions, the time of current fuse fusing only is 16s.On the other hand; the minimum battery unit that current fuse is protected has two cells; and test records when two cell short circuits, and the average current of preceding 20s is 1023A, so the response time of present embodiment can be satisfied the requirement of two cell short-circuit protections.
In sum, the reliability height that disconnects of the utility model short circuit, have plurality of advantages such as arc extinguishing function, short-circuit protection response time weak point, low cost of manufacture, assembling are simple, easy to maintenance.
The making step of preferred embodiment of the present utility model mainly comprises:
(1) first, second electroconductive elastic sheet 31,32 is screwed as shown in Figure 3 on main casing 12.
(2) main casing is fixed on the aluminium matter welding bearing that matches with main casing (aluminium can not connect with soldering), flattens first, second electroconductive elastic sheet 31,32 one-tenth Fig. 6 shapes.
(3) tin cream is coated in uniformly in the slit between first, second electroconductive elastic sheet 31,32.
(4) first, second electroconductive elastic sheet 31,32 is compressed and welds.
(5) pull down the welding bearing, install lower cover and fill quartz sand simultaneously.
The utility model also provides a kind of electrokinetic cell, and described electrokinetic cell comprises at least two cells, is electrically connected between the cell, is electrically connected by at least one current fuse provided by the utility model between the cell.Be specially the outer end of first, second electric conductor of current fuse and the lug lead-out tablet of cell are welded together.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (10)
1. current fuse, it is characterized in that: it comprises the insulation box body with cavity, electric conductor, and electroconductive elastic sheet; Described electric conductor comprises first electric conductor and second electric conductor, and described electroconductive elastic sheet comprises first electroconductive elastic sheet and second electroconductive elastic sheet;
Described first, second electric conductor and described insulation box body are fixed, and it is external that described insulation booth is extended in its outer end, and its inner is positioned at cavity;
First, second electroconductive elastic sheet is positioned at described cavity, and its outer end fixedly is electrically connected with the inner of described first, second electric conductor, and its inner is welded together by precompressed; The elastic potential energy that breaks away from solder joint when first electroconductive elastic sheet and/or second electroconductive elastic sheet have short circuit.
2. according to the described current fuse of claim 1, it is characterized in that: described first electric conductor and first electroconductive elastic sheet are structure as a whole, and described second electric conductor and second electroconductive elastic sheet are structure as a whole.
3. according to the described current fuse of claim 1, it is characterized in that: be filled with arc-extinguishing medium in the described cavity.
4. according to the described current fuse of claim 3, it is characterized in that: described arc-extinguishing medium is a quartz sand.
5. according to any described current fuse of claim 1-3, it is characterized in that: described electroconductive elastic sheet comprises at least two conduction branch shell fragments.
6. according to any described current fuse of claim 1-3, it is characterized in that: described electric conductor is a laminated structure, and the thickness of described electroconductive elastic sheet is less than the thickness of electric conductor.
7. according to any described current fuse of claim 1-3, it is characterized in that: the ratio of the resistance of described electroconductive elastic sheet and the resistance of electric conductor is 1.5-2.5.
8. according to any described current fuse of claim 1-3, it is characterized in that: described electroconductive elastic sheet is the beryllium copper shell fragment.
9. according to the described current fuse of claim 1, it is characterized in that: described insulation box body comprises upper cover plate, main casing and lower cover, and described upper cover plate, lower cover are fixed on the main casing, and encloses the described inner chamber of formation with main casing; Described electric conductor extends out between described upper cover plate and described main casing, and by described upper cover plate and described main casing clamping.
10. an electrokinetic cell comprises at least two cells, is electrically connected between the cell, it is characterized in that: described cell is electrically connected as any described current fuse of claim 1 to 9 by at least one.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201324572U CN201438449U (en) | 2009-06-05 | 2009-06-05 | Current fuse and power battery |
| EP10777379.8A EP2409312B1 (en) | 2009-05-21 | 2010-05-20 | Current fuse device and battery assembly comprising the same |
| PCT/CN2010/073016 WO2010133176A1 (en) | 2009-05-21 | 2010-05-20 | Current fuse device and battery assembly comprising the same |
| JP2012511135A JP5416835B2 (en) | 2009-05-21 | 2010-05-20 | Current fuse device and battery assembly including the same |
| US13/301,042 US9054368B2 (en) | 2009-05-21 | 2011-11-21 | Current fuse device and battery assembly comprising the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201324572U CN201438449U (en) | 2009-06-05 | 2009-06-05 | Current fuse and power battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201438449U true CN201438449U (en) | 2010-04-14 |
Family
ID=42400420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201324572U Expired - Lifetime CN201438449U (en) | 2009-05-21 | 2009-06-05 | Current fuse and power battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201438449U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010133176A1 (en) * | 2009-05-21 | 2010-11-25 | Byd Company Limited | Current fuse device and battery assembly comprising the same |
| CN102360997A (en) * | 2011-10-09 | 2012-02-22 | 桂林航天电子有限公司 | Release device of battery protection switch |
| CN103378375A (en) * | 2012-04-20 | 2013-10-30 | 三星Sdi株式会社 | Battery pack |
| CN107221629A (en) * | 2017-06-29 | 2017-09-29 | 北京小米移动软件有限公司 | Battery and mobile terminal |
-
2009
- 2009-06-05 CN CN2009201324572U patent/CN201438449U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010133176A1 (en) * | 2009-05-21 | 2010-11-25 | Byd Company Limited | Current fuse device and battery assembly comprising the same |
| US9054368B2 (en) | 2009-05-21 | 2015-06-09 | Byd Company Limited | Current fuse device and battery assembly comprising the same |
| CN102360997A (en) * | 2011-10-09 | 2012-02-22 | 桂林航天电子有限公司 | Release device of battery protection switch |
| CN102360997B (en) * | 2011-10-09 | 2012-12-26 | 桂林航天电子有限公司 | Release device of battery protection switch |
| CN103378375A (en) * | 2012-04-20 | 2013-10-30 | 三星Sdi株式会社 | Battery pack |
| CN107221629A (en) * | 2017-06-29 | 2017-09-29 | 北京小米移动软件有限公司 | Battery and mobile terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20100414 |