CN109961990A - A kind of protection element and protective module - Google Patents
A kind of protection element and protective module Download PDFInfo
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- CN109961990A CN109961990A CN201711399308.8A CN201711399308A CN109961990A CN 109961990 A CN109961990 A CN 109961990A CN 201711399308 A CN201711399308 A CN 201711399308A CN 109961990 A CN109961990 A CN 109961990A
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- terminal
- insulating substrate
- bimetal leaf
- leaf
- protection element
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- 230000001681 protective effect Effects 0.000 title claims abstract description 19
- 239000000758 substrate Substances 0.000 claims abstract description 58
- 101000669528 Homo sapiens Tachykinin-4 Proteins 0.000 claims abstract 9
- OKUGPJPKMAEJOE-UHFFFAOYSA-N S-propyl dipropylcarbamothioate Chemical compound CCCSC(=O)N(CCC)CCC OKUGPJPKMAEJOE-UHFFFAOYSA-N 0.000 claims abstract 9
- 102100039365 Tachykinin-4 Human genes 0.000 claims abstract 9
- 238000010438 heat treatment Methods 0.000 claims description 8
- KDLHZDBZIXYQEI-UHFFFAOYSA-N Palladium Chemical compound [Pd] KDLHZDBZIXYQEI-UHFFFAOYSA-N 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 239000002002 slurry Substances 0.000 claims description 6
- 206010037660 Pyrexia Diseases 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000002184 metal Substances 0.000 claims description 4
- KJTLSVCANCCWHF-UHFFFAOYSA-N Ruthenium Chemical compound [Ru] KJTLSVCANCCWHF-UHFFFAOYSA-N 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 229910052763 palladium Inorganic materials 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 229910052707 ruthenium Inorganic materials 0.000 claims description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 10
- 229910001416 lithium ion Inorganic materials 0.000 description 10
- 230000005669 field effect Effects 0.000 description 7
- 239000004065 semiconductor Substances 0.000 description 7
- 238000001035 drying Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
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- 238000005245 sintering Methods 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 238000013024 troubleshooting Methods 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007650 screen-printing Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000009841 combustion method Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
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- 230000007774 longterm Effects 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
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- 229920001568 phenolic resin Polymers 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
- H01H71/10—Operating or release mechanisms
- H01H71/12—Automatic release mechanisms with or without manual release
- H01H71/14—Electrothermal mechanisms
- H01H71/16—Electrothermal mechanisms with bimetal element
-
- 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
Landscapes
- Thermally Actuated Switches (AREA)
Abstract
The present invention discloses a kind of protection element and protective module, and protection element includes insulating substrate, the first terminal being installed on insulating substrate, Second terminal, spring leaf, bimetal leaf, the PPTC contacted below bimetal leaf and always with bimetal leaf；Also there is the third terminal and heater positioned at insulating substrate bottom；Spring leaf is controlled by bimetal leaf to be directly connected to or disconnect with first terminal; bimetal leaf own temperature or when increasing bimetallic temperature after generating heat by heater simultaneously; bimetal leaf controls spring leaf and first terminal disconnects, to make the protection element that spring leaf can be made to disconnect with Second terminal and make being electrically connected between first terminal and Second terminal that must pass through PPTC in overcurrent, over-voltage, excess temperature；Presentation high-impedance state can be acted rapidly by being influenced PPTC by high ambient temperature simultaneously, inhibit external circuit to continue to charge, so that battery core be protected to avoid charging at high temperature.The protection element may be implemented overcurrent, over-voltage, excess temperature multiple protective.
Description
Technical field
The present invention relates to protection elements used in a kind of circuit.
The present invention relates to a kind of protective modules of lithium ion secondary battery.
Background technique
Lithium ion secondary battery is because big, the small in size feature of its capacity is increasingly becoming the consumer electronics market mainstream, in hand
Applied in large quantities in machine, notebook, tablet computer, digital camera etc. portable mobile apparatus, but its have it is huge
Big security risk, especially because charge and discharge misoperation or charger aging and generate overcurrent, over-voltage (overcharging), mistake
Temperature will cause the risk of battery core burning and explosion.
Lithium ion secondary battery second class protection major programme has PTC, Thermal Cutoffs, breaker, voltage and current inspection at present
Survey IC and metal-oxide-semiconductor field effect transistor.
PTC is posive temperature coefficient thermistor, when there is overcurrent in route, its own fever, when temperature is more than material
When Curie temperature, resistance value can be increased dramatically high resistant by low-resistance, and limitation line current is to protect circuit.The hair of itself at this time
Heat can make it persistently maintain high-impedance state, until troubleshooting, after line current restores normal, slowly cooling can restore low
Resistance value.The Curie temperature of general PTC, which is above lithium ion secondary battery, to be allowed using temperature, so PTC can only be protected as overcurrent
Shield is used；
The fuse of Thermal Cutoffs is low-melting alloy, and when environment temperature is more than fuse fusing point, fuse will fuse, make
It plays a protective role at open lines.But it is disposably, to be gradually abandoned use；
Breaker working principle is using bimetal leaf switch motion at a certain temperature come protection circuit, switch temperature
Degree can be controlled accurately and can be restored, gradually instead of Thermal Cutoffs.But it cannot accurate overcurrent protection；
Measure voltage & current IC and metal-oxide-semiconductor field effect transistor its working principle is that by detection of the IC to line current and voltage,
The switch and closure for controlling metal-oxide-semiconductor field effect transistor, thus protection circuit.The disadvantage is that IC and metal-oxide-semiconductor field effect transistor belong to semiconductor
Device is easy to fail, and expensive, cannot be widely used.
The scheme of the various prior arts described above, there is the limitation of oneself, cannot realize simultaneously overcurrent, over-voltage,
Excess temperature multiple protective.
Therefore the technical solution for needing one kind new is to solve the above problems.
Summary of the invention
Goal of the invention: provide it is a kind of can with overcurrent, over-voltage, excess temperature multiple protective protection element.
Invention also provides a kind of protective modules comprising the protection element, equally can be realized overcurrent, over-voltage, mistake
The multiple protective of temperature.
Technical solution: in order to achieve the above objectives, following technical solution can be used in protection element of the present invention:
A kind of protection element, comprising: insulating substrate, is equally installed on insulation at the first terminal being installed on insulating substrate
Second terminal on substrate, across on first terminal and Second terminal spring leaf, be located at below spring leaf and against spring
The bimetal leaf of piece, the PPTC contacted below the bimetal leaf and always with bimetal leaf；The PPTC connects with first terminal
Touching；Also there is the third terminal and heater positioned at insulating substrate bottom；The heater be located on insulating substrate and at the same time
It is contacted with Second terminal and third terminal；Bimetal leaf includes original state and deformed state, when the temperature of bimetal leaf rises
When to deformation occurs temperature, i.e., bimetal leaf becomes deformed state from original state；When bimetal leaf is located at original state, institute
It states spring leaf while being directly connected to first terminal and Second terminal；When bimetal leaf is located at deformed state, bimetal leaf is upward
Jack-up spring leaf, spring leaf and first terminal are directly connected to disconnect.
The utility model has the advantages that
It controls spring leaf by setting bimetal leaf in the present invention to be directly connected to or disconnect with first terminal, while double gold
When belonging to piece own temperature or increasing bimetallic temperature after generating heat by heater, bimetal leaf controls spring leaf and first
Terminal disconnects, to make the protection element that can make spring leaf and Second terminal disconnection in overcurrent, over-voltage, excess temperature and make the
Being electrically connected between one terminal and Second terminal must pass through PPTC；Presentation can be acted rapidly by being influenced PPTC by high ambient temperature simultaneously
High-impedance state inhibits external circuit to continue to charge, so that battery core be protected to avoid charging at high temperature.The protection element may be implemented
Overcurrent, over-voltage, excess temperature multiple protective.
Further, the insulating substrate top surface downwards it is recessed fluted, spring leaf is located on groove, bimetal leaf and
PPTC is located in groove, and heater is located at the bottom surface of insulating substrate；First terminal is extended into groove and is contacted with PPTC.The knot
Structure can make overall structure flat, to be conducive to minimize.
Further, the Second terminal includes positioned at the second upper end of the second upper end and connection of insulating substrate upper surface
Portion and the second lower end for being located at insulating substrate lower surface；Second upper end is fixedly connected with spring leaf.Second lower end
Portion is located at two sides to be connected on circuit board, with spring leaf in order to weld job.
Further, the first terminal includes positioned at the first upper end of the first upper end and connection of insulating substrate upper surface
Portion and the first lower end for being located at insulating substrate lower surface；The self-insulating upper surface of base plate in first upper end extends into described recessed
In slot and it is located at below PPTC.
Further, the first terminal is attached at the side of insulating substrate, and it is opposite that Second terminal is attached at insulating substrate
Other side.
Further, the first terminal is located at the side of insulating substrate, and Second terminal is located at the other side of insulating substrate；
The first terminal is the first upper end through the upper end of insulating substrate and first terminal, and the lower end of first terminal is the first lower end
Portion；The Second terminal is the second upper end through the upper end of insulating substrate and Second terminal, and the lower end of Second terminal is second
Lower end.
Further, the heater surface is covered with insulating layer；Heater be one of ruthenium base, platinum base, palladium base or
The slurry of a variety of compositions is heating resistor.
Further, the bimetal leaf is the arc that convex surface is resisted against spring leaf bottom surface in the initial state；Bimetallic
Piece is resisted against the arc of the upper surface PPTC in deformed state for convex surface.In this way in bimetal leaf in deformed state, bimetallic
The both ends of piece are lifted up to prop up spring leaf.
Further, the deformation temperature threshold value of bimetal leaf is set, when the temperature of bimetal leaf is located at the threshold value or more,
Bimetal leaf becomes deformed state from original state；When the temperature of bimetal leaf is lower than the threshold value, bimetal leaf is from deformation shape
State becomes original state.
The present invention also provides a kind of technical solutions of protective module including above-mentioned protection element:
It further include voltage detecting IC and MOSFET；Voltage detecting IC and Second terminal connection are by protection battery core；It is described
MOSFET is to connect third terminal；Voltage detecting IC is to electric by protection being connected to third terminal to MOSFET making alive
Core；When MOSFET making alive, third terminal is connected to makes heater generate heat by protection battery core.
The utility model has the advantages that the protective module is by voltage detecting IC and MOSFET to determine whether when over-voltage and over-voltage makes third
Terminal, which is connected to power supply, makes heater generate heat；And above-mentioned protection element is contained, make the protection element in overcurrent, over-voltage, excess temperature
When so that spring leaf and Second terminal is disconnected and is made being electrically connected between first terminal and Second terminal that must pass through PPTC；
Presentation high-impedance state can be acted rapidly by being influenced PPTC by high ambient temperature simultaneously, inhibit external circuit to continue to charge, to protect electricity
Core avoids charging at high temperature.The protective module may be implemented overcurrent, over-voltage, excess temperature multiple protective.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of protection element in the present invention, and bimetal leaf is in original state.
Fig. 2 is the structural schematic diagram of protection element in the present invention, and bimetal leaf is in deformed state.
Fig. 3 is the schematic layout pattern of first terminal on insulating body bottom surface, Second terminal, third terminal.
Fig. 4 is the bottom view of protection element in the present invention.
Fig. 5 is the schematic layout pattern of first terminal on insulating body upper surface in the present invention, Second terminal.
Fig. 6 is that protection element is illustrated in the second level protection installation circuit of lithium ion secondary battery in protective module of the present invention
Figure.
Specific embodiment
Explanation of technical terms in present embodiment:
PPTC (Polymeric Positive Temperature Coefficent): high molecular polymer positive coefficient temperature
Spend element.
Bimetal leaf: being a kind of composite wood as composed by two or more metals with suitable performance or other materials
Material.Bimetal leaf is also referred to as thrermostatic bimetal-plate, since the thermal expansion coefficient of each constituent element layer is different, when the temperature is changed, active layers
Deformation is greater than the deformation of passive layer, so that the entirety of bimetal leaf will be to passive layer curving, then this composite material
Curvature change to generating deformation.
MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor): metal-oxide
Semiconductor field effect transistor.
Embodiment one
The embodiment of protection element.
Described in please referring to Fig.1 to Fig.4, the present invention discloses a kind of protection element, is mainly used in, comprising: insulating substrate 5,
The first terminal 2 that is installed on insulating substrate 5, the Second terminal 3 being equally installed on insulating substrate 5, across in first terminal 2
With in Second terminal 3 spring leaf 1, positioned at the lower section of spring leaf 1 and against the bimetal leaf of spring leaf 17, be located at bimetal leaf 7
Lower section and the PPTC6 contacted always with bimetal leaf 7；The PPTC 6 is contacted with Second terminal 3.Also have and is located at insulating substrate
The third terminal 4 and heater 8 of 5 bottoms.The heater 8 is located on insulating substrate 5 and at the same time with first terminal 2 and third
Terminal 3 contacts.In the present embodiment, whole flat in order to make since this protection element is applied in the confined space in such as mobile phone
It puts down and minimizes, as shown in Figure 1, the top surface of the insulating substrate 5 downward recessed fluted 51, spring leaf 1 is located on groove 5,
Bimetal leaf 7 and PPTC 6 are located in groove 51, and heater 8 is located at the bottom surface of insulating substrate 5；First terminal 2 extends into groove
It is contacted in 51 and with PPTC 6.8 surface of heater is covered with insulating layer 9；Heater is ruthenium base, platinum base, one in palladium base
Kind or a variety of compositions slurry or be heating resistor.Insulating layer 9 can be glass paste, ceramic slurry, glass glaze, epoxy resin,
Phenolic resin, silicone resin etc. are one or more.Heater 8 is mainly that route the pyrotoxin of the product under overpressure situation occurs, is mentioned
Heating load makes bimetal leaf 7 become deformed state, insulating layer 9 mainly avoid the electronic component using when occur on circuit board
Tin cream contact heater 8 by mistake and the short circuit for leading to heater 8.7 resistance of double-spring piece guarantees in 50m Ω~100m Ω
Itself heat power consumption of route is small when normal, while guaranteeing that fever makes bimetal leaf 7 bounce enough when overcurrent.6 resistance of PPTC
Its component system can be carbon black powder, ceramic powder, nickel powder, and preferably long-term action restores the smaller carbon black powder system of circulatory resistance drift
PPTC。
Bimetal leaf 7 includes original state and deformed state (being determined by the temperature of bimetal leaf), when the temperature of bimetal leaf
When temperature that degree rises to that deformation occurs, i.e., bimetal leaf 7 becomes deformed state from original state；When bimetal leaf 7 is located at initially
When state, the spring leaf 1 is directly connected to first terminal 2 and Second terminal 3 simultaneously, and (this is considered as the initial shape of spring leaf 7
State)；When bimetal leaf 7 is located at deformed state, bimetal leaf 1 jacks up spring leaf upwards, and spring leaf 1 is straight with Second terminal 3
Disconnection is connect in succession.In the present invention, the bimetal leaf 7 is resisted against the arc of 1 bottom surface of spring leaf in the initial state for convex surface；
Bimetal leaf 7 is resisted against the arc of 6 upper surface PPTC in deformed state for convex surface, and the both ends of bimetal leaf 7 are tilted upward at this time
It rises and props up spring leaf, so that spring leaf 1 be made to separate with first terminal 2.It is directly connect to adjust spring leaf 1 with first terminal 2
Touch-control system can be set to the contact 11 of the contact of first terminal 2 below spring leaf 1.In order to accurately control, bimetallic is set
The deformation temperature threshold value (can be by selecting the bimetal leaf of various criterion to realize) of piece 7, when the temperature of bimetal leaf 7 is located at the threshold
When being worth above, bimetal leaf 7 becomes deformed state from original state；When the temperature of bimetal leaf 7 is lower than the threshold value, bimetallic
Piece becomes original state from deformed state.
Also, since first terminal 2, Second terminal 3 need to be welded on circuit board when in use, except being connect with spring leaf 1
Outside the part of touching, first terminal 2, Second terminal 3 further include lower end.Specifically: the first terminal 2 includes being located at insulation base
The first upper end 21 and the first upper end 21 of connection and the first lower end 22 positioned at 5 lower surface of insulating substrate of 5 upper surface of plate.
Self-insulating 5 upper surface of substrate in second upper end 21 extends into the groove 51 and is located at 6 lower section PPTC.Work as bimetallic
When piece 7 is located at original state, first upper end 21 is fixedly connected with spring leaf 1.
The Second terminal 3 includes positioned at the second upper end 31 of the second upper end 31 and connection of 5 upper surface of insulating substrate
And it is located at the second lower end 32 of 5 lower surface of insulating substrate.Second upper end 31 is fixedly connected with spring leaf 1, i.e., when double
When sheet metal 7 is in deformed state and jacks up spring leaf 1 upwards, the second upper end 31 is still fixedly connected with spring leaf 1.
The first terminal 2 is attached at the side of insulating substrate 5, and it is opposite in addition that Second terminal 3 is attached at insulating substrate 5
Side.Here as shown in Figure 1, 2, first terminal 2, Second terminal 3 are sticked in the form of sheets on insulating substrate 5.But in the accompanying drawings not
The other embodiments shown can choose another terminal types, i.e., the described first terminal is located at the side of insulating substrate 5,
Second terminal is located at the other side of insulating substrate 5；The first terminal is first through the upper end of insulating substrate 5 and first terminal
Upper end, the lower end of first terminal are the first lower end；The Second terminal runs through insulating substrate and the upper end of Second terminal is
Second upper end, the lower end of Second terminal are the second lower end, and the structure of this " running through " insulating substrate does not need terminal and is
Sheet can equally play identical electrical connection effect.
In the present embodiment, it is formed as shown in figure 3, drying sintering in 5 underrun silk-screen printing silver paste of insulating substrate
(third terminal is only in insulation base for first lower end 22 of first terminal, the second lower end 32 of Second terminal and third terminal 4
The bottom surface of plate 5).It is dried as shown in figure 4, printing the resistance slurry that sheet resistance is 1 Ω between in the second lower end 32, third terminal 4
Dry combustion method knot forms heater 8, then printed medium slurry drying sintering forms insulating layer 9 on heater 8, under second
The thickness of end 32, the spacing of third terminal 4 and heater 8 and insulating layer 9 is 1 Ω come the resistance value for adjusting final heater.Such as
Shown in Fig. 1 and Fig. 5, the first upper end 21, the second upper end are formed by the drying sintering of silk-screen printing silver paste on 5 surface of insulating substrate
Portion 32, the first upper end 21 extend into the surface of groove 51 there are three protrusion 211, are convenient for being in close contact with PPTC 6,.
The protection element specifically used method is as follows:
When the protection element is arranged in lithium ion secondary battery circuit, if 6 room temperature resistance value of PPTC is 5 Ω.When circuit electricity
When stream is no more than 3A, normal battery operation.When lithium ion secondary battery short circuit, electric current is generally more than 10A or more.Spring leaf 1
Spontaneous heating is gradually warmed up, according to power be equal to electric current square multiplied by 1 resistance of spring leaf, when temperature is more than 70 DEG C of (i.e. this implementations
Threshold value in mode is 70 DEG C) when, bimetal leaf 7 becomes deformed state and bounces to jack up spring leaf 1.Spring leaf 1 and at this time
One terminal 2 disconnects.Electric current successively passes through first terminal 2, PPTC 6, bimetal leaf 7, spring leaf 1, Second terminal 3, simultaneously
Influenced PPTC 6 by high current movement can be presented high-impedance state and generate heat rapidly, maintain the deformed state of bimetal leaf 7.Directly
To troubleshooting, after overcurrent disappears, bimetal leaf 7 returns to original state, and spring leaf 1 is directly connect with first terminal 2 again, i.e.,
Protection element is returned to normal condition.
When environment temperature is more than 70 DEG C, bimetal leaf 7 becomes deformed state and bounces to jack up spring leaf 1, at this time spring
Piece 1 is disconnected with first end 2.Electric current successively passes through first terminal 2, PPTC 6, bimetal leaf 7, spring leaf 1, Second terminal
3, while the meeting of PPTC 6 movement presentation high-impedance state rapidly is influenced by high ambient temperature, inhibit external circuit to continue to charge, to protect
Shield lithium ion secondary battery battery core avoids charging at high temperature, only restores normal to environment temperature, bimetal leaf 7 returns to initial shape
State, spring leaf 1 are directly connect with first terminal 2 again.
When lithium ion secondary battery overcharges, circuit voltage is generally more than 3V.8 spontaneous heating of heater is gradually warmed up, according to
Power be equal to voltage square divided by fever bulk resistor, when temperature is more than 70 DEG C, bimetal leaf 7 becomes deformed state and bounces
Jack up spring leaf 1.Spring leaf 1 is disconnected with first terminal 2 at this time.Electric current successively passes through first terminal 2, PPTC 6, double gold
Belong to piece 7, spring leaf 1, Second terminal 3, while environment heating caused by by heater spontaneous heating is influenced PPTC 6 and can acted rapidly
High-impedance state is presented and generates heat, maintains the deformed state of bimetal leaf 7.Until troubleshooting, over-voltage disappearance (pulls out charging
Line), bimetal leaf 7 returns to original state, and spring leaf 1 is directly connect with first terminal 2 again.
Embodiment two
The embodiment of protective module
The present embodiment includes above-mentioned protection element, meanwhile, referring to Fig. 6, protective module connection lithium ion secondary electricity
The battery core (battery group mark in figure) in pond further includes voltage detecting IC and MOSFET (FET in figure)；Voltage detecting IC and second
Terminal is connected by protection battery core；The MOSFET is to connect third terminal；Voltage detecting IC to MOSFET making alive with
Third terminal is connected to by protection battery core；When MOSFET making alive, third terminal, which is connected to, makes heater by protection battery core
Fever.
3 and 4 ends of MOSFET field-effect tube are open circuits under normality, only when the potential at 5 ends reaches its setting value 3 and 4
End can be connected, and third terminal, which is connected to power supply, at this time makes heater generate heat.
The specific working principle is as follows: switch is closed with 1 end when circuit is normal.When there is excess temperature or overcurrent, switch and 2
End closure, PPTC accesses circuit at this time, protects battery core.When there is over-voltage (overcharging), voltage detecting IC detects battery core both ends
Potential difference, improve 5 ends potential to particular value, the 3 of FET are connected to 4 ends at this time, and voltage-drop loading makes its hair to heater both ends
Heat, trigger switch and 2 ends are closed, and PPTC accesses circuit at this time, protect battery core.
In addition, there are many concrete methods of realizing and approach of the invention, the above is only a preferred embodiment of the present invention.
It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, can also do
Several improvements and modifications out, these modifications and embellishments should also be considered as the scope of protection of the present invention.What is be not known in the present embodiment is each
The available prior art of component part is realized.
Claims (10)
1. a kind of protection element characterized by comprising insulating substrate, the first terminal being installed on insulating substrate, same peace
Loaded on insulating substrate Second terminal, across on first terminal and Second terminal spring leaf, be located at spring leaf below simultaneously
Against the bimetal leaf of spring leaf, below the bimetal leaf and always the PPTC contacted with bimetal leaf；The PPTC and
One termination contact；Also there is the third terminal and heater positioned at insulating substrate bottom；The heater is located on insulating substrate
And at the same time being contacted with Second terminal and third terminal；
Bimetal leaf includes original state and deformed state, when the temperature of the bimetal leaf temperature that rises to that deformation occurs, i.e., double
Sheet metal becomes deformed state from original state；When bimetal leaf is located at original state, the spring leaf is directly connected to simultaneously
First terminal and Second terminal；When bimetal leaf is located at deformed state, bimetal leaf jacks up spring leaf, spring leaf and upwards
One terminal is directly connected to disconnect.
2. protection element according to claim 1, it is characterised in that: the top surface of the insulating substrate is recessed with downwards recessed
Slot, spring leaf are located on groove, and bimetal leaf and PPTC are located in groove, and heater is located at the bottom surface of insulating substrate；First end
Son is extended into groove and is contacted with PPTC.
3. protection element according to claim 2, it is characterised in that: the Second terminal includes being located at table on insulating substrate
Second upper end and the second upper end of connection and the second lower end positioned at insulating substrate lower surface in face；Second upper end
It is fixedly connected with spring leaf.
4. protection element according to claim 3, it is characterised in that: the first terminal includes being located at table on insulating substrate
First upper end and the first upper end of connection and the first lower end positioned at insulating substrate lower surface in face；First upper end
Self-insulating upper surface of base plate extends into the groove and is located at below PPTC.
5. protection element according to claim 4, it is characterised in that: the first terminal is attached at the one of insulating substrate
Side, Second terminal are attached at the opposite other side of insulating substrate.
6. protection element according to claim 4, it is characterised in that: the first terminal is located at the side of insulating substrate,
Second terminal is located at the other side of insulating substrate；The first terminal is on first through the upper end of insulating substrate and first terminal
End, the lower end of first terminal are the first lower end；The Second terminal is through insulating substrate and the upper end of Second terminal is the
Two upper ends, the lower end of Second terminal are the second lower end.
7. protection element according to claim 6, it is characterised in that: the heater surface is covered with insulating layer；Fever
Body is the slurry of one of ruthenium base, platinum base, palladium base or a variety of compositions or is heating resistor.
8. protection element according to claim 1, it is characterised in that: the bimetal leaf supports in the initial state for convex surface
It is against the arc of spring leaf bottom surface；Bimetal leaf is resisted against the arc of the upper surface PPTC in deformed state for convex surface.
9. protection element according to claim 1, it is characterised in that: the deformation temperature threshold value of bimetal leaf is arranged, when double
When the temperature of sheet metal is located at the threshold value or more, bimetal leaf becomes deformed state from original state；When the temperature of bimetal leaf
When lower than the threshold value, bimetal leaf becomes original state from deformed state.
10. a kind of includes the protective module of the protection element as described in any one of claims 1 to 9, it is characterised in that: further include
Voltage detecting IC and MOSFET；Voltage detecting IC and Second terminal connection are by protection battery core；The MOSFET is to connect third
Terminal；Voltage detecting IC to MOSFET making alive being connected to third terminal by protection battery core；When MOSFET making alive
When, third terminal is connected to makes heater generate heat by protection battery core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711399308.8A CN109961990A (en) | 2017-12-22 | 2017-12-22 | A kind of protection element and protective module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711399308.8A CN109961990A (en) | 2017-12-22 | 2017-12-22 | A kind of protection element and protective module |
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| Publication Number | Publication Date |
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| CN109961990A true CN109961990A (en) | 2019-07-02 |
Family
ID=67018708
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711399308.8A Pending CN109961990A (en) | 2017-12-22 | 2017-12-22 | A kind of protection element and protective module |
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| Country | Link |
|---|---|
| CN (1) | CN109961990A (en) |
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| CN110957700A (en) * | 2019-11-12 | 2020-04-03 | 广东电网有限责任公司 | Automatic unlocking type transformer substation with emergency protection function |
| CN113572128A (en) * | 2021-08-11 | 2021-10-29 | 上海维安电子有限公司 | Over-temperature and over-current integrated protection element |
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