CN105556776A - Protection circuit - Google Patents
Protection circuit Download PDFInfo
- Publication number
- CN105556776A CN105556776A CN201480048999.5A CN201480048999A CN105556776A CN 105556776 A CN105556776 A CN 105556776A CN 201480048999 A CN201480048999 A CN 201480048999A CN 105556776 A CN105556776 A CN 105556776A
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- Prior art keywords
- heater
- voltage
- fusible conductor
- circuit
- electrode
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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.)
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
- H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M2200/00—Safety devices for primary or secondary batteries
- H01M2200/10—Temperature sensitive devices
- H01M2200/103—Fuse
Abstract
The invention provides a protection circuit. In this invention, even if an excessive voltage is applied, a heating element continues to produce heat, without burning out, for the length of time for which heat needs to be produced to melt a fusible conductor, thereby reliably breaking a charging/discharging path. This protection circuit is provided with battery cells (3), a voltage-detecting element (4), a protection element (5), a switch element (6), and a delay circuit (7). The voltage-detecting element (4) detects the voltage across each battery cell (3). The protection element (5) comprises the following: a fusible conductor (16) provided on a charging/discharging path for the battery cells (3); and a heating element (12) that is connected to the battery cells (3). When current is supplied to the heating element (12), said heating element (12) produces heat that melts the fusible conductor (16). The switch element (6) is connected to the heating element (12) and controls the supply of current thereto in accordance with output from the voltage-detecting element (4). The delay circuit (7) delays the application of voltage to the heating element (12).
Description
Technical field
The present invention relates to a kind of protective circuit cutting off current path, particularly in the suitable protective circuit needing to use in the battery circuit of fast shut-off current path when urgent of lithium rechargeable battery etc.The application advocates the priority of No. 2013-184663, Japanese patent application (application on September 6th, 2013), and with reference to this application open full content and be incorporated in this.
Background technology
Chargeable and recycling secondary cell be mostly processed to battery pack (batterypack) and be supplied to user.Especially; in the lithium rechargeable battery that gravimetric energy density is high; in order to ensure the safety of user and electronic equipment, usually the guarantee circuit being used for additives for overcharge protection, over etc. is built in battery pack, thus there is the function of the output cutting off battery pack under predetermined circumstances.
In this circuit, use the FET switch being built in battery pack to carry out the on/off (ON/OFF) exported, carry out additives for overcharge protection or the over action of battery pack thus.But; be no matter due to which kind of reason FET switch Damage by Short Circuit time, to be caused transient flow super-high-current owing to be struck by lightning etc. time or due to the life-span of battery unit, output voltage declines singularly or exports excessive abnormal voltage on the contrary time, battery pack or electronic equipment all should be subject to protection to prevent the accidents such as on fire.Therefore, even if in order to also the output of battery unit be cut off safely under so all abnormalities imagined, and use the protection component be made up of fuse element, this fuse element has according to the function from the signal cut current path of outside.
Protection component as the battery circuit towards such lithium rechargeable battery etc. is generally used in protection component inside and has heater, and passes through the structure of the fusible conductor (fuse) on this heater blowout current path.
At Fig. 6, protective circuit 50 is shown as corresponding technology of the present invention.Protective circuit 50 is such as the battery circuit of the battery pack for lithium rechargeable battery, and possesses: have the battery pile 51 of the battery unit of lithium rechargeable battery, cut off the protection component 52 of charging when battery pile 51 is abnormal, detect the voltage detector component 53 of voltage of battery pile 51 and the switch element 54 of the action according to the testing result Control protection element 52 of voltage detector component 53.
Protection component 52 is connected in series on the discharge and recharge path of battery pile 51; and there is fusible conductor 55 and heater 56; fusible conductor 55 forms a part for this discharge and recharge path; heater 56 is connected with switch element 54 and passes through to be supplied electric power by battery pile 51 and generate heat, thus fusible conductor 55 is fused.
It is that the low-melting-point metal such as Pb-free solder of main component is formed that fusible conductor 55 such as uses with Sn.Heater 56 be resistance value higher and be energized time heating the parts with conductivity; be made up of such as W, Mo, Ru etc.; and by the coccoid of their alloy or constituent, compound and resin binder etc. are mixed to get slurry, utilize screen printing technique to make this slurry on the insulated substrate of formation protection component 52, form pattern and carry out firing etc. and formed.
This protection component 52 controls the power supply to heater 56 by switch element 54.
Voltage detector component 53 monitors the voltage of battery pile 51, and when becoming overcharge voltage or overdischarge voltage the control signal of output control switch element 54.
Switch 54 such as by field-effect transistor (hereinafter referred to as FET.) form, if when the magnitude of voltage of battery pile 51 becomes the voltage exceeding predetermined overdischarge or overcharge condition, receive the detection signal exported from voltage detector component 53, then carry out action in the mode making heater 56 be energized.Thus, with regard to switch element 54, to make fusible conductor 55 fuse by the heating of heater 56, thus the mode cutting off the discharge and recharge path of battery pile 51 controls.
Formed protective circuit 50 is formed, when detecting element 53 detects the abnormal voltage of battery pile 51, to switch element 54 output detection signal by such circuit.The switch element 54 receiving detection signal controls electric current and powers to make the heater 56 from battery pile 51 to protection component 52.Thus, protective circuit 50 can be generated heat by heater 56, and discharge and recharge path is cut off in fuse 55 fusing.
Prior art document
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 2005-243652 publication
Patent documentation 2: Japanese Unexamined Patent Publication 2006-221919 publication
Patent documentation 3: Japanese Unexamined Patent Publication 2009-267293 publication
Summary of the invention
Technical problem
Here, the heating in order to the heater 56 by protection component 52 makes fusible conductor 55 fuse, and needs to apply the voltage according to the rated value of heater 56.That is, if heater 56 is applied in the voltage higher than rated voltage, then self melting due to spontaneous heating (Joule heat) before making fusible conductor 55 fuse, to burn, cannot fuse fusible conductor 55.
Particularly, fusible conductor 55 is carried across between the pair of electrodes be arranged on discretely on the insulated substrate forming protection component 52, if the melting due to the heating of heater 56, is then cut off by moving in this pair of electrodes.Thus, the discharge and recharge path of protection component 52 cut-off protection circuit 50.Therefore, heater 56 at least need until this fusible conductor 55 melting and move in pair of electrodes time remaining heating.
, usually used as heater 56 can be made not burn and the use voltage range of persistent fever, upper voltage limit is about 1.5 ~ 2 times of lower voltage limit, cannot tackle on a large scale according to the number of the battery unit of protective circuit 50.Therefore, in the high-tension situation being applied in the use voltage range exceeding heater 56, likely the fusible conductor 55 front heater 56 that fuses just has been burnt.
Therefore; the object of the present invention is to provide a kind of protective circuit; heater 56 in this protective circuit has wider use voltage range; even if when being applied in any excessive voltage that can imagine; also can not burn and persistent fever making fusible conductor 55 required time that fuses, thus reliably cut off discharge and recharge path.
Technical scheme
In order to solve above-mentioned problem, protective circuit of the present invention possesses: battery unit; Voltage detector component, it detects the voltage of above-mentioned battery unit; Protection component, it has fusible conductor and heater, and above-mentioned fusible conductor is arranged on the discharge and recharge path of above-mentioned battery unit, and above-mentioned heater is connected with above-mentioned battery unit and generates heat by being energized thus fused by above-mentioned fusible conductor; Switch element, it is connected with above-mentioned heater and controls the energising to above-mentioned heater according to the output of above-mentioned voltage detector component; And delay circuit, it postpones to apply voltage to above-mentioned heater.
Technique effect
According to the present invention, even if under becoming overcharge condition at battery and being applied in high-tension situation, heater also can not burn and persistent fever before the fusing of fusible conductor, thus can expand the use voltage range of heater.
Accompanying drawing explanation
Fig. 1 illustrates the circuit diagram applying protective circuit of the present invention.
Fig. 2 is the vertical view of the configuration example that protection component is shown, (A) illustrates the state before fusible conductor fusing, and (B) illustrates the state after fusible conductor fusing.
Fig. 3 is the curve chart illustrated in existing protective circuit and the relation between the elapsed time applied in protective circuit of the present invention and applying voltage (high voltage).
Fig. 4 is the curve chart illustrated in existing protective circuit and the relation between the elapsed time applied in protective circuit of the present invention and applying voltage (low-voltage).
Fig. 5 is the figure of the configuration example that other delay circuits are shown, (A) illustrates the configuration example using lc circuit, and (B) illustrates the configuration example using L circuit, and (C) illustrates the configuration example using PWM producing component.
Fig. 6 is the circuit diagram that existing protective circuit is shown.
Symbol description
1: protective circuit, 2: battery pack, 3: battery unit; 4: voltage detector component, 5: protection component, 6: switch element; 7: delay circuit, 8: battery pile, 10: insulated substrate; 11: insulating element, 12: heater, 13: the first electrodes; 14: the second electrodes, 15: heater extraction electrode, 16: fusible conductor; 17: heater electrode, 19: supply access, 20:PWM producing components
Embodiment
Below, be described in detail to applying protective circuit of the present invention with reference to accompanying drawing.Should illustrate, the present invention is not limited in following execution mode, can carry out various change without departing from the spirit and scope of the invention.In addition, accompanying drawing is schematically scheme, and the ratio of each size etc. are different from actual conditions sometimes.Concrete sizes etc. should be considered following explanation in light of actual conditions and judge.In addition, be also certain containing mutual size relationship and/or the different part of ratio among the figures.
Apply protective circuit 1 of the present invention, such as can use as the circuit of the battery pack 2 of lithium rechargeable battery as shown in Figure 1.Battery pack 2 has: the battery unit 3 of lithium rechargeable battery, the voltage detector component 4 detecting the voltage of battery unit 3, the protection component 5 cutting off discharge and recharge path when the abnormal voltage of battery unit 3, the switch element 6 controlling the electric current of circulation in protection component 5 according to the output of voltage detector component 4 and the delay circuit 7 be arranged between voltage detector component 4 and switch element 6.
[battery unit/voltage detector component]
Battery unit 3 is set up multiple, and is connected by connection in series-parallel and form battery pile 8.Or protective circuit 1 also can only include a battery unit 3.
Battery unit 3 is monitored magnitude of voltage at ordinary times by voltage detector component 4.Voltage detector component 4 is connected with each battery unit 3 and is connected with switch element 6 via delay circuit 7.Further, voltage detector component 4 detects the magnitude of voltage of each battery unit 3, and when any one battery unit 3 becomes overcharge voltage or overdischarge voltage, exports control signal to switch element 6.
[protection component]
Fig. 2 illustrates a configuration example of protection component 5.As shown in (A) of Fig. 2, protection component 5 possesses: insulated substrate 10, the on the insulating substrate 10 stacked and heater 12 covered by the insulating elements such as glass 11, first electrode 13 at two ends being formed in insulated substrate 10 and the second electrode 14, to be layered in heater extraction electrode 15 on insulating element 11 and two ends to be connected to the first electrode 13, second electrode 14 and central portion is connected to the fusible conductor 16 of heater extraction electrode 15 in the mode overlapping with heater 12.
Insulated substrate 10 such as uses aluminium oxide, glass ceramics, mullite, zirconia etc. have the parts of insulating properties and are formed as general square shape.In addition, insulated substrate 10 can also use epoxy glass substrate, phenolic substrate etc. for the material of printed wiring substrate, but temperature when needing to pay attention to the fusing of fusible conductor 16.
Heater 12 be resistance value higher and be energized time heating the parts with conductivity, be such as made up of W, Mo, Ru etc.Heater 12 can by being mixed to get slurry by the coccoid of their alloy or constituent, compound and resin binder etc., and utilize screen printing technique to make this slurry form pattern on the insulating substrate 10 to carry out firing etc. and being formed.
With regard to heater 12, heater electrode 17 is at one end set and is connected with switch element 6 via this heater electrode 17.In addition, the other end of heater 12 is connected with heater extraction electrode 15, and heater 12 is connected with fusible conductor 16 via this heater extraction electrode 15.Heater 12 on the surface of insulated substrate 10 cover by insulating element 11.Insulating element 11 is in order to while the protection realizing heater 12 and insulation, the heat of heater 12 is effectively transmitted to fusible conductor 16 and heater extraction electrode 15 and is arranged, such as, is made up of glassy layer.
Should illustrate, in protection component 5, also insulating element 11 also can be formed between the surface of insulated substrate 10 and heater 12, thus make heater 12 be configured in the inside of insulating element 11.In addition, in protection component 5, also heater 12 can be formed in insulated substrate 10 with the back side of surperficial opposite side being formed with the first electrode 13, second electrode 14.Further, in protection component 5, also heater 12 can be formed in the inside of insulated substrate 11.In addition, in protection component 5, also heater 12 can be formed in the surface of insulated substrate 11, and adjoin with the first electrode 13, second electrode 14 and formed.
The heater extraction electrode 15 be connected with heater 12 is laminated with at the upper surface of insulating element 11.Heater extraction electrode 15 can, by being heated by heater 12, make the fused conductor of fusible conductor 16 be easy to cohesion.
The first electrode 13 and the second electrode 14 is formed at the pair of right and left side edge part of insulated substrate 10.First electrode 13 and the second electrode 14 are equipped with fusible conductor 16 via attachment solder.In addition, the first electrode 13, second electrode 14, facing to the side of insulated substrate 11, is connected via the external connecting electrode (not shown) of through hole (throughhole) with the back side being arranged on insulated substrate 11.Further, the first electrode 13, second electrode 14 is connected via the discharge and recharge path of external connecting electrode with the protective circuit 1 of installing protection component 5.
First electrode 13, second electrode 14 can use the common electrode materials such as Cu and/or Ag to be formed.In addition, preferably, on the surface of the first electrode 13, second electrode 14, the tunicles such as plating Ni/Au, plating Ni/Pd, plating Ni/Pd/Au are formed by known plating.Thereby, it is possible to prevent the oxidation of the first electrode 13, second electrode 14, thus reliably keep fused conductor.In addition; can prevent when carrying out Reflow Soldering attachment to protection component 5, due to connect fusible conductor 16 attachment solder or formed fusible conductor 16 outer field low-melting-point metal generation melting and by the first electrode 13, second electrode 14 corrode (solder corrode).
Fusible conductor 16 is by making the discharge and recharge path short circuit of protective circuit 1 across carrying out carrying between the first electrode 13, second electrode 14.Fusible conductor 16 can use arbitrary metal of quick fuse by the heating of heater 12, and such as can preferably use with Sn is the low-melting-point metal such as Pb-free solder of main component.The materials such as Pb, Ag, Au, Cu, Ge, Ni, In can be used in addition to form fusible conductor 16.
In addition, fusible conductor 16 can be formed by stacked low-melting-point metal and refractory metal.As the stepped construction of low-melting-point metal and refractory metal, such as, can enumerate the structure being carried out coating low-melting-point metal paper tinsel by plating refractory metal.Preferably using as low-melting-point metal with Sn is the solder such as Pb-free solder of main component, the alloy etc. preferably using Ag, Cu as refractory metal or be main component with them.By containing refractory metal and low-melting-point metal; when carrying out Reflow Soldering attachment to protection component 5; even if Reflow Soldering temperature exceedes the melt temperature of low-melting-point metal; low-melting-point metal generation melting; also low-melting-point metal can be suppressed externally to flow out, thus maintain the shape of fusible conductor 16.In addition, also refractory metal corrode (solder corrode) can be made by low-melting-point metal generation melting, the temperature quick fuse thus below the fusing point of refractory metal when fusing.
Fusible conductor 16 is separated from each other by being welded on and being formed and between the first electrode 13, second electrode 14 be connected with the discharge and recharge path of battery unit 3 etc., and be connected in series on the discharge and recharge path of battery unit 3, form a part for discharge and recharge path thus.
In protection component 5; if heater 12 generates heat, fusible conductor 16 melting, as shown in (B) of Fig. 2, this fused conductor is high and on the first electrode 13, second electrode 14 that area is large by attracteding to wetability; and on heater extraction electrode 15, and fused.Thus, protection component 5 can cut off the discharge and recharge path of battery unit 3.
Via the switch element 6 that heater electrode 17 is connected with heater 12, such as, be made up of FET.Switch element 6 is connected with voltage detector component 4 via delay circuit 7 described later, and control as when the magnitude of voltage of battery unit 3 becomes the overdischarge or overcharge condition that depart from predetermined magnitude of voltage, detection signal according to exporting from voltage detector component 4 is powered to heater 12, thus cuts off the discharge and recharge path of battery unit 3.
[switch element]
In protective circuit 1, heater 12 and switch element 6 are connected in series and heater 12 and switch element 6 are connected in parallel with battery unit 3.Thus, protective circuit 1 is formed with the supply access 19 supplying electric power to heater 12.Under the state that battery unit 3 is rated voltage, supply access 19 is limited the energising to heater 12 by switch element 6.Further, protective circuit 1 becomes overcharge condition for a certain reason at battery unit 3 thus in the high-tension situation becoming overrate, by switch element 6, supply access 19 is energized, and heater 12 starts heating thus, is fused by fusible conductor 16.
[delay circuit]
Delay circuit 7 is provided with between voltage detector component 4 and switch element 6.Delay circuit 7 postpones the applying of the voltage outputting to switch element 6 and heater 12 from voltage detector component 4 according to time constant, thus can prevent by being applied above the larger transient high voltage of rated value and burning of causing to heater 12.By making delay circuit 7 between voltage detector component 4 and switch element 6; even if under protective circuit 1 becomes overcharge condition at battery unit 3 and is applied in high-tension situation; heater 12 also can not burn and persistent fever before fusible conductor 16 fuses, thus can expand the use voltage range of heater 12.
Therefore; even if protective circuit 1 becomes the situation of overcharge condition at battery unit 3 and/or is applied under high-tension situation of the rated value exceeding heater 12 etc. due to the exception of charged side of charging to battery unit 3; also can postpone to apply high voltage by delay circuit 7; postpone the time be accumulated to till the heat energy burning heater 12 thus; and make fusible conductor 16 fuse betwixt, cut off the discharge and recharge path of battery unit 3 thus.
As mentioned above; in protection component 5; fusible conductor 16 is equipped with across on the first electrode 13, second electrode 14; if fusible conductor 16 melting by the heating of heater 12; then to attracted to wetability high and on the first electrode 13, second electrode 14 that area is large for fused conductor, makes between the first electrode and the second electrode cut-off thus.Therefore, heater 12 needs until fusible conductor 5 melting, and till moving on the first electrode 13, second electrode 14 during persistent fever.
But, when battery unit 3 becomes the situation of the high-voltage state of the use voltage range exceeding heater 12 and/or causes heater 12 to be applied in high voltage by the fault etc. of the charged side be connected with battery pack 2, heater 12 is applied in the heat energy that heater 12 is burnt instantaneously, and burn before making fusible conductor 16 fuse, thus the discharge and recharge path of battery unit 3 cannot be cut off.
Therefore; protective circuit 1 postpones to be accumulated to time till the heat energy burning heater 12 by arranging delay circuit 7; obtain fusible conductor 16 to fuse the required time; even if be applied in the high-tension situation exceeding and use voltage range at heater 12 under, also can make fusible conductor 16 melting and move on the first electrode 13, second electrode 14 thus time remaining heating needed for cutting off.
Thus, with regard to protective circuit 1, the use voltage range of heater 12 expands, even if when being applied in any excessive voltage that can imagine, also can cut off discharge and recharge path.
Fig. 3 illustrates in existing protective circuit 50 (with reference to Fig. 6) and the relation between the elapsed time applied in protective circuit 1 (with reference to Fig. 1) of the present invention and applying voltage (high voltage).In the existing protective circuit 50 not having delay circuit, high voltage is applied on heater 56 instantaneously, therefore heater 56 prior to fusible conductor 55 fusing time and burn, thus fusible conductor 55 cannot be made to fuse.
On the other hand; according to applying protective circuit 1 of the present invention; by making delay circuit 7 between voltage detector component 4 and switch element 6; can postpone to apply high voltage; and the time that delay is accumulated to till the heat energy burning heater 12, and the discharge and recharge path of battery unit 3 can be cut off by the fusible conductor 16 that fuses betwixt.Namely, according to the present invention, even if in the high-tension situation being applied in the degree of burning heater 12, also can postpone to burn the required time, and can obtain and make fusible conductor 16 melting and to move on the first electrode 13, second electrode 14 thus time needed for fusing.Thus, in protective circuit 1, the use voltage range of heater 12 expands, even if when being applied in any excessive voltage that can imagine, also can cut off discharge and recharge path.
When being applied in low-voltage, obtain the time lengthening making the heat of fusible conductor 16 melting, but compared with the situation not making delay circuit 7 between voltage detector component 4 and switch element 6, only make the time delay reaching the maximum current circulating in heater 6, in addition, also continuing, so as the fusing time of fusible conductor 16, can be used as error range in actual use owing to generating heat therebetween.
Fig. 4 illustrates in existing protective circuit 50 (with reference to Fig. 6) and the relation between the elapsed time applied in protective circuit 1 (with reference to Fig. 1) of the present invention and applying voltage (low-voltage).Compared with the existing protective circuit 50 not having delay circuit; in the protective circuit 1 making delay circuit 7 between voltage detector component 4 and switch element 6; apply voltage comparatively mild relative to the ascending curve in elapsed time, the accumulation heat when reaching maximum voltage becomes about about 50% of existing protective circuit 50.This is equivalent to the fusing time as fusible conductor 16, extends 50% of time of delay, such as, when time of delay is 1000msec, only extends 0.5sec, can be used as error range in actual use.Therefore, problem can not be become by the prolongation of the fusing time when applying low-voltage making delay circuit 7 cause between voltage detector component 4 and switch element 6.
[time constant]
Here, the time constant of delay circuit 7 is preferably set to and makes heater 12 at least in fusible conductor 16 melting, and move to the first electrode 13, second electrode 14 thus cut off needed for time remaining heating, be such as more than 100msec.
If time constant is shorter than 100msec, then executed to heater 12 alive time of delay not enough, heater 12 prior to fusible conductor 16 fusing and burn, thus likely cannot cut off the discharge and recharge path of battery unit 3.
On the other hand, as long as the time constant of delay circuit 7 is more than 100msec, such as, also can be 1000msec.If time constant extends, even if then also extend at the fever time being applied in heater 6 in high-tension situation, therefore, it is possible to make fusible conductor 16 fuse more reliably.
[formation of delay circuit]
Delay circuit 7 can be consisted of RC circuit as shown in Figure 1.In addition, delay circuit 7 also can be consisted of lc circuit as Suo Shi (A) of Fig. 5, and can consist of L circuit as Suo Shi (B) of Fig. 5.Further, delay circuit 7 also can arrange PWM (PulseWidthModulation: pulse width modulation) producing component 20 as shown in (C) of Fig. 5, and adjusts the applying voltage relative to the elapsed time by the active power that adjustment is applied to heater 12.
In addition, in foregoing, delay circuit 7 is arranged between voltage detector component 4 and switch element 6, but delay circuit 7 also can be arranged on supply access 19.In the case, such as switch element 6 is made up of relay (relay) element of FET and setting on supply access 19.But as shown in Figure 1, delay circuit 7 is arranged on being formed between voltage detector component 4 and switch element 6 and can reduces in rated value this point to be favourable.
Embodiment
Next, embodiments of the invention are described.In the present embodiment, for can use voltage range be the heater of 4 [V] ~ 7 [V] be applied with 4 [V], 7 [V], 10 [V], 20 [V], 50 [V] each voltage time, can confirmation make fusible conductor fuse.
In embodiment 1, in the formation shown in Fig. 1, employ the protective circuit of the delay circuit with 100msec time of delay.In example 2, in the formation shown in Fig. 1, employ the protective circuit of the delay circuit with 500msec time of delay.In embodiment 3, in the formation shown in Fig. 1, employ the protective circuit of the delay circuit with 1000msec time of delay.In comparative example 1, use the formation shown in Fig. 6, namely the protective circuit of delay circuit is not set.
[table 1]
As shown in table 1, in the embodiment 1 ~ embodiment 3 being provided with delay circuit, even if when being applied with the voltage exceeding and can use voltage range to heater, fusible conductor also can be made to fuse.This is because: in embodiment 1 ~ embodiment 3, by making delay circuit between voltage detector component and switch element, can postpone until be applied in the time of the heat energy burning heater, thus make fusible conductor fuse betwixt.
On the other hand, in the comparative example 1 not arranging delay circuit, when being applied with the voltage exceeding and can use voltage range to heater, before making fusible conductor fuse, heater self will burn due to spontaneous heating, thus fusible conductor cannot be made to fuse.
In addition, if comparing embodiment 1 ~ embodiment 3, be then in the embodiment 1 of 100msec in time of delay, fusible conductor can be made to fuse when applying voltage is 10 [V], but heater first burnt when more than 20 [V].In addition, be in the embodiment 2 of 500msec in time of delay, apply voltage until 20 [V] can both make fusible conductor fuse, but heater first burnt when 50 [V].On the other hand, be in the embodiment 3 of 1000msec in time of delay, even if fusible conductor also can be made to fuse when applying voltage is 50 [V].
That is, in the known protective circuit being provided with delay circuit, along with the prolongation of time of delay, even if applying fusible conductor also can be made to fuse when voltage is larger, that is, can by heater can the range set of operation voltage must be wider.
Claims (4)
1. a protective circuit, is characterized in that, possesses:
Battery unit;
Voltage detector component, it detects the voltage of described battery unit;
Protection component, it has fusible conductor and heater, and described fusible conductor is arranged on the discharge and recharge path of described battery unit, and described heater is connected with described battery unit and generates heat by being energized thus fused by described fusible conductor;
Switch element, it is connected with described heater, controls the energising to described heater according to the output of described voltage detector component; With
Delay circuit, it postpones to apply voltage to described heater.
2. protective circuit according to claim 1, is characterized in that,
The described fusible conductor of described protection component is arranged across between the pair of electrodes be connected with described discharge and recharge path respectively,
Described delay circuit is set with time constant, with make described heater at least described fusible conductor by the heating of described heater melting and move to described pair of electrodes thus cut off needed for time remaining heating.
3. protective circuit according to claim 1, is characterized in that,
The time constant of described delay circuit is more than 100msec.
4. the protective circuit according to any one of claims 1 to 3, is characterized in that,
Described delay circuit is consisted of any one in RC circuit, lc circuit, L circuit and PWM producing component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010528871.6A CN111725789A (en) | 2013-09-06 | 2014-09-03 | Protective circuit |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2013-184663 | 2013-09-06 | ||
| JP2013184663A JP6329741B2 (en) | 2013-09-06 | 2013-09-06 | Protection circuit |
| PCT/JP2014/004536 WO2015033563A1 (en) | 2013-09-06 | 2014-09-03 | Protection circuit |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010528871.6A Division CN111725789A (en) | 2013-09-06 | 2014-09-03 | Protective circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105556776A true CN105556776A (en) | 2016-05-04 |
Family
ID=52628059
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010528871.6A Pending CN111725789A (en) | 2013-09-06 | 2014-09-03 | Protective circuit |
| CN201480048999.5A Pending CN105556776A (en) | 2013-09-06 | 2014-09-03 | Protection circuit |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010528871.6A Pending CN111725789A (en) | 2013-09-06 | 2014-09-03 | Protective circuit |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP6329741B2 (en) |
| KR (1) | KR102307565B1 (en) |
| CN (2) | CN111725789A (en) |
| TW (1) | TWI688181B (en) |
| WO (1) | WO2015033563A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI638498B (en) * | 2015-05-26 | 2018-10-11 | 陳葆萱 | Secondary battery pack and its protective component |
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- 2014-09-03 CN CN202010528871.6A patent/CN111725789A/en active Pending
- 2014-09-03 CN CN201480048999.5A patent/CN105556776A/en active Pending
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20160050025A (en) | 2016-05-10 |
| JP2015053780A (en) | 2015-03-19 |
| TW201517433A (en) | 2015-05-01 |
| TWI688181B (en) | 2020-03-11 |
| KR102307565B1 (en) | 2021-10-01 |
| JP6329741B2 (en) | 2018-05-23 |
| CN111725789A (en) | 2020-09-29 |
| WO2015033563A1 (en) | 2015-03-12 |
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