A kind of big current fuse
Technical field
The present invention relates to a kind of big current fuse, the big current fuse of particularly a kind of protecting secondary battery that is operated under the low-voltage
Background technology
In recent years, the technological development of secondary cell is showing improvement or progress day by day, and the electrokinetic cell that wherein is used for various uses is also along with growing up.Electric bicycle, tour bus, big bus, electric automobile, communication, post and telecommunications, railway, fields such as military naval vessel, it will drive the flourish of whole dynamic lithium battery industry, is promoting with green, environmental protection, pollution-free, the high efficiency new forms of energy that can recycle.Generally, the discharging current of these power battery pack is all more than tens amperes, have in addition reach the hundreds of ampere.Because being extensive use of of electrokinetic cell produced a problem that discharging and recharging of power battery pack protected.A kind of power battery management system that has electronic circuit to constitute for example occurred, it is the system of being switched by a kind of contactor of electronic circuit control.But this contactor volume is bigger, and cost is high relatively, and owing to adopt the contact incoming current to cut off, also the ability that electric current is born in the contact can occur simultaneously, and the hidden danger that self contact resistance brought.
Summary of the invention
A kind of big current fuse of the present invention, it comprises:
Main fuse-link is made of many low-melting alloy silks, the disconnected agent of fluxing of shrinking to two end electrodes after being filled with on every side of alloy silk is used for causing melting alloy wire;
Pair of metal electrodes (6) and (7);
Two resistive heaters (8) and (9);
One compact temperature fuse (10) is used to disconnect the power supply of heater (8) and (9);
Two metal electrode arranged parallel, one direction of above-mentioned metal electrode is designed to the welding bar (11a) of pectination and (11b), many low-melting alloy silks (3) be connected in parallel on two above-mentioned metal electrodes default welding bar (11a) and (11b) on, the main fuse-link of a big current fuse of many low-melting alloy silks formations;
The direct heat transmission is arranged between heater and the metal electrode; By flexible cord two resistive heaters are together in parallel, connect with above-mentioned Thermal Cutoffs (10) again, an end that does not connect heater of Thermal Cutoffs (10) stretches out as lead-out wire (14), and an end that is not connected Thermal Cutoffs of above-mentioned be connected in parallel two resistive heaters (8) and (9) stretches out with lead-in wire (15).
Further:
The design of the big current fuse that a kind of protecting secondary battery is used is that it has one group of main fuse-link that is made of many low-melting alloy silks, pair of L-shaped metal plate electrode, a nonmetal supporting seat, two resistive heaters, a Thermal Cutoffs, a non-metal shell.Nonmetal supporting seat is used for fixing the metal plate electrode, and makes two plate electrode secured in parallel.The one direction design of L shaped metal electrode has a splicing ear that goes out as high-current leading, the welding bar that pectination is arranged in another direction design of L shaped metal electrode, be used for fixing the low-melting alloy silk, form main fuse-link, the radical of low-melting alloy silk in parallel is many more, and the nominal operation circuit that can bear is just big more.Design has sunk die cavity part in two positions up and down of nonmetal supporting seat, is used for placing resistive heater and Thermal Cutoffs element; Usually two big current terminals of this big current fuse are connected in the main circuit as main fuse, when excessive or temperature is too high when the fault current of control circuit sensing, thereby control the power supply that junction closure is connected resistive heater by control circuit, the intensification of heater impels the main fuse quick fuse.
In order to provide a kind of than the last safeguard protection of using the good a kind of big current fuse of A.C. contactor as batteries.Particularly be different from the big current fuse of a kind of secondary cell of general big current fuse.The manufacturing technology of this big current fusing body is based upon on the technical foundation of making Thermal Cutoffs, and adopts the many temperature sensitive low-melting alloy silk current fusing bodies that constitute in parallel, so both can improve current carrying capacity.In order to promote the quick fuse of electric current fuse, design has the heating resistor of employing near parallel pole, and the heat that heating resistor produces passes to current fusing body so that fusing rapidly by parallel pole.It is rapid that this big current fuse has fusing time, and volume is little, over-current protection device easy to install and use.
The big current fuse of the designed protecting secondary battery of the present invention can produce the big current fuse of 100 amperes even bigger rated operational current.And the disposable cut-out principal current of energy, avoid causing accidents such as fire and even blast with support equipment because of abnormal factors occurring.The present invention is set in respect of the heater that impels main fuse-link quick fuse, compares with big contactor, does not have shell, and volume is little, and is simple in structure, and compactness is easy for installation.In addition, this fuse that reaches 100 amperes of working direct currents also can tolerate the pulse current of 8/20 above microsecond waveform of 100 kilo-amperes, is expected to obtain to use in the shocking preventing technology field.
The present invention be equivalent to a kind of disposable cut-out fault current and can not be once more closed cut-out switch.
Description of drawings
Fig. 1 is a circuit diagram of the present utility model;
Fig. 2 is the general assembly schematic diagram of embodiment 1;
Fig. 3 is the composition structural representation of the main temperature fuse of embodiment 1;
Fig. 4 is interior electrode and the alloy silk schematic diagram in parallel of main temperature fuse of embodiment 1;
Fig. 5 a, Fig. 5 b are the stereograms of positive two angles of non-metal case supporting seat of the not built-in little Thermal Cutoffs of embodiment 1 and heater; Fig. 5 c is the stereogram in the non-metal case supporting seat front of the built-in little Thermal Cutoffs of embodiment 1 and heater;
Fig. 6 a is the stereogram of the nonmetal supporting seat reverse side of not built-in little Thermal Cutoffs of embodiment 1 and heater;
Fig. 6 b is the stereogram of the nonmetal supporting seat reverse side of built-in little Thermal Cutoffs of embodiment 1 and heater;
Fig. 7 is the electrode structure schematic diagram of embodiment 1;
Fig. 8 is the circuit diagram of embodiment 2;
Fig. 9 is the structure general assembly schematic diagram of embodiment 2;
Figure 10 embodiment 2 clamping support schematic diagrames;
Figure 11 is to be the composition structural representation of the main temperature fuse of embodiment 2;
Embodiment
Embodiment 1:
1 to 6 pair of the specific embodiment of the present invention is further narrated in conjunction with the accompanying drawings now, in accompanying drawing 1, is concrete preferred implementation of the present invention.The big current fuse that this protecting secondary battery is used comprises one group of main fuse-link that is made of many low-melting alloy silks (3), also can be described as main temperature fuse (1), and the fusion temperature of the low-melting alloy of present embodiment is 130 ℃; Pair of L-shaped metal plate electrode (6) and (7), a non-metal shell (4), a nonmetal supporting seat (5), two resistive heaters (8) and (9), a compact temperature fuse (10) is formed; The notch (16a) of (6) or (7) usefulness that above-mentioned nonmetal supporting seat (5) is designed to have fixed metal electrode, (16b), do not need special measure just can fix pair of metal electrodes, make that two metal plate electrodes can arranged parallel, a direction design of above-mentioned L shaped metal plate electrode (6) and (7) has a pilot hole (6a), (7a), be used as the splicing ear that big electric current is externally drawn, another direction design of above-mentioned L shaped metal plate electrode has the welding bar (11a) of comb shape and (11b), respectively be provided with hole (18) on the welding bar and be used for locating welding low-melting alloy silk (3), form main fuse-link, design has sunk die cavity part (12a) and (12c) in the front position of above-mentioned nonmetal supporting seat (5), in die cavity (12a), place resistive heater (8), design has sunk die cavity part (12b) in the reverse side position of above-mentioned nonmetal supporting seat (5), and in die cavity (12b), place resistive heater (9), and in die cavity (12c), place compact temperature fuse (10), between heater and the metal plate electrode heat transfer effect is rapidly arranged; Two resistive heaters are together in parallel by flexible cord by two apertures (13a) default in the nonmetal supporting seat with (13b), be together in series with above-mentioned Thermal Cutoffs (10) again, be placed in the sunk die cavity of nonmetal supporting seat, an end that does not connect heater of Thermal Cutoffs (10) reaches nonmetal supporting seat outside, as lead-out wire (14), an end that is not connected Thermal Cutoffs of above-mentioned be connected in parallel two resistive heaters (8) and (9) reaches nonmetal supporting seat outside with lead-in wire (15); 8 low-melting alloy silks (3) by means of the location of hole (13) be connected in parallel default on two above-mentioned metal electrodes 4 welding bars (11a) and (11b) on, article 4, the welding bar forms pectination, 8 low-melting alloy silks constitute the main fuse-link of a big current fuse, around the low-melting alloy silk, insert a kind of disconnected agent (2) of fluxing, use above-mentioned nonmetallic again, for example the shell of engineering plastics (4) covers the fuse-link part is airtight, and is tied with nonmetal supporting seat.Then, with epoxy resin (19) non-metal shell is sealed airtight cavity volume of formation by the hole (20) of passing through in the nonmetal support, main fuse-link and special resin that 8 alloy silks (3) are formed have been comprised in the cavity volume, epoxy resin also fills up the recessed position of (5) two faces of nonmetal supporting seat simultaneously substantially, both make metal electrode no longer mobile, also improved the outward appearance of product; The internal cavity of above-mentioned non-metal shell (4) is divided into 4 little cavity volumes by built-in 3 twigs of the chaste tree (17), be respectively charged into 4 welding bars (11a) and (11b) reached the alloy silk (3) that has welded, alloy silk after 3 twigs of the chaste tree are used to prevent to melt is gathered together under the effect of gravity, disconnects thoroughly to guarantee the alloy silk.
Use a compact temperature fuse (10) and resistive heater (8), (9) to be in series in the design of the present invention, work long hours in order not allow resistive heater after principal current is cut off, also cross, the break-off signal of compact temperature fuse (10) disconnects earlier with the alloy silk (3) that guarantees main fuse-link than the break-off signal height of the alloy silk (3) of main fuse-link.
When this big current fuse is used for the protection of secondary cell; because main fuse body of the present invention can bear the rated operational current of tens amperes and even hundreds of ampere and operate as normal; when in case the charging voltage that detects secondary cell by control circuit is crossed high dangerous phenomenon; just can send control command; thereby connect the circuit of resistive heater; make the heater heating; when heat being transmitted to main fuse-link by metal electrode; impel all low-melting alloy silk fusing back under the effect of disconnected agent (2) of fluxing and disconnect; like this, the just safety assurance that provides to secondary cell.Use big current fuse as the performer that cuts off fault current, more convenient than the installation of using contactor, economy, and also volume is also little many.If need to obtain bigger operating current, just can reach as long as increase the radical of low-melting alloy silk.
Embodiment 2:
Extremely shown in Figure 8 as Fig. 7, its structure is similar with embodiment 1, its circuit structure as shown in Figure 7, the structure of main temperature fuse (1) is identical, difference is that supporting seat (27) sets up a compact temperature fuse (28), and its two lead-in wires are independent outwards draws;
On the structure, resistive heater (26) is fitted with metal plate electrode (7), and it is permanent fixing to adopt rivet (22) to carry out, and between heater and the metal plate electrode direct heat conduction is arranged, same resistive heater (25) is fitted with metal plate electrode (6), also adopts rivet to fix; Nonmetal supporting seat (27) is provided with notch (16a), (16b) equally, is used for fixing metal plate electrode (6), (7); Also be provided with two grooves in nonmetal supporting seat (27) inside, groove (23) is used for fixing compact temperature fuse (10), its effect is identical with its effect in embodiment 1, and groove (24) is used for fixing another compact temperature fuse (28), this compact temperature fuse (28) but the outer signal circuit, when the temperature of experiencing whole fuse reaches its fusing-off temperature, disconnect, play warning function; After finishing above-mentioned assembling, fill the inner chamber of nonmetal supporting seat (27) with curable nonmetallic materials, thereby form a firm integral body.
Below only be the specific embodiment of the present invention, but design concept of the present invention is not limited thereto, allly utilizes this design that the unsubstantiality that the present invention carries out is changed, all should belong to the behavior of invading protection range of the present invention.