CN202434623U - Battery protection element - Google Patents
Battery protection element Download PDFInfo
- Publication number
- CN202434623U CN202434623U CN2011205520926U CN201120552092U CN202434623U CN 202434623 U CN202434623 U CN 202434623U CN 2011205520926 U CN2011205520926 U CN 2011205520926U CN 201120552092 U CN201120552092 U CN 201120552092U CN 202434623 U CN202434623 U CN 202434623U
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- China
- Prior art keywords
- conductive layer
- film conductive
- ptc element
- lead
- substrate
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- Expired - Lifetime
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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 provides a battery protection element, which comprises a base plate, a first film conductive layer and a second film conductive layer which are arranged on the top surface of the base plate and are not interconnected, a heating resistor which is arranged on the top surface of the base plate and has two ends which are respectively connected with the first film conductive layer and the second film conductive layer, a first positive temperature coefficient (PTC) element, a second PTC element, a first lead, a second lead and a third lead which is connected with the second film conductive layer and is led outside the base plate. A pair of electrodes are formed on the two opposite sides of each of the first PTC element and the second PTC element. One electrode of the first PTC element is connected with the first film conductive layer. The first lead is connected with the other electrode of the first PTC element and is led outside the base plate. One electrode of the second PTC element is connected with the first film conductive layer. The second lead is connected with the other electrode of the second PTC element and is led outside the base plate. Since the battery protection element is integrated on the base plate, the size is small, the transfer and the maintaining of heat are facilitated and the action of the PTC elements is realized by using smaller heating power. Since the PTC elements are connected with the heating resistor through the film conductive layers, the conductive performance is good, the contact resistance is small and the connection is reliable.
Description
Technical field
The utility model belongs to secondary rechargeable battery protective circuit field, relates in particular to a kind of battery saver.
Background technology
In recent years, along with popularizing of various portable electronic address equipment,, it becomes the focus of public attention day by day for providing the safety issue of the secondary rechargeable battery (like lithium ion chargeable battery) of portable power source.And equipment has also proposed higher safety requirements to battery charge and discharge process to the demand that the battery flying power further promotes.As the battery saver that is applied in the secondary rechargeable battery protective circuit, the mode of known reliable battery abnormal heating fusing low-melting alloy silk realizes the Thermal Cutoffs that turn-offs.Integrated on this basis heater is also arranged, when battery is unusual,, realize the protection assembly of shutoff with this low-melting alloy silk that fuses the heater heating power.Other has and in circuit, is furnished with PTC and heater, realizes that through heater control to the PTC break-make is to realize the protective circuit (patent publication No. CN101091297A) to the battery component protection.
Yet receiving thermal cut with the low-melting alloy silk is the protection component of principle, and its protection temperature is determined by alloy silk fusing point.Fusing point is low excessively, can reduce its ability to bear to operating current.Solution is through increase alloy silk cross-sectional area, or heater is set in element, and the heat that after protection component receives the fusing signal, produces with heater is realized the fusing of alloy silk.The former understands the overreach on the one hand, then can cause the element overall dimensions to increase on the other hand.Then there are many restrictions in heater power and position in the latter aspect being provided with, and protective value is difficult to further raising.In addition, the low-melting alloy silk is irrecoverable behind the one-time action, in case protection component turn-offs, then cell integrated scrapping then more is difficult to maintain and replace if use to solidify in the inner flexible-packed battery of electrical equipment.And pass through the protective circuit that heater is controlled PTC, the circuit board requisite space is required big; And there is the interval that is difficult to avoid when PTC and heating resistor are arranged, requires heating element to have bigger heating power, be difficult to realize; And PTC and heating resistor are prone to produce loose contact, cause potential safety hazard.
Summary of the invention
The utility model provides a kind of power demand little, safe and reliable, the battery saver that volume is little, easy for installation for one of solving the problems of the technologies described above.
For achieving the above object, the utility model provides a kind of battery saver, comprising: substrate, the first film conductive layer, the second film conductive layer, heating resistor, a PTC element, the 2nd PTC element, first lead-in wire, second lead-in wire and the 3rd lead-in wire; The said first film conductive layer and the second film conductive layer are formed at the end face of substrate, and the first film conductive layer is not connected with the second film conductive layer mutually; Said heating resistor is positioned at substrate top surface, and its two ends are connected with the second film conductive layer with the first film conductive layer respectively; A said PTC element and the 2nd PTC element all are formed with pair of electrodes in its relative both sides, and a utmost point of a said PTC element is connected with the first film conductive layer, and first lead-in wire is connected with another utmost point of a PTC element and is drawn out to outside the substrate; One utmost point of said the 2nd PTC element is connected with the first film conductive layer, and second lead-in wire is connected with another utmost point of the 2nd PTC element and is drawn out to outside the substrate; Said the 3rd lead-in wire is connected with the second film conductive layer and is drawn out to outside the substrate.
Preferably, the end face of said substrate is coated with encapsulated layer.
Preferably, said encapsulated layer is cold setting resin layer or epoxy resin layer or UV glue-line.
Preferably, said encapsulated layer is provided with the hard case chip.
Preferably, the said first film conductive layer is inverted U-shaped, comprises first connecting portion, second connecting portion and connects first connecting portion and the middle interconnecting piece of second connecting portion; A said PTC element is connected with first connecting portion, and the 2nd PTC element is connected with second connecting portion, and an end of heating resistor is connected with middle interconnecting piece.
Preferably, the said second film conductive layer is arranged between first connecting portion and second connecting portion.
Preferably, said substrate is ceramic wafer or epoxy resin board.
Preferably, said heating resistor is ruthenium oxide resistance or Chip-R.
Preferably, said first lead-in wire, second lead-in wire, and the 3rd lead-in wire all be coated with tin with the junction of a PTC element, the 2nd PTC element and the second film conductive layer respectively.
The beneficial effect of the utility model is: battery saver is installed in the protective circuit, and when electric current was excessive, the heating resistor conducting also produced heat; Through first, second PTC element of substrate heating; First, second PTC element excites the PTC effect, and breaking circuit, realizes circuit protection.The battery saver of the utility model is integrated on the substrate; Volume is little, and can be used as independently element and conveniently be installed in the circuit through lead-in wire, and owing to be integral type; More help the transmission and the maintenance of heat, be beneficial to less heating power and realize the action of PTC element.In addition, the PTC element is connected with heating resistor through the film conductive layer, therefore conducts electricity very well, and contact resistance is little, connects more reliable.
Description of drawings
Fig. 1 is the sketch map that first, second film conductive layer and heating resistor are set on the substrate that provides of the utility model.
Fig. 2 is the front view of the battery saver of the embodiment that provides of the utility model.
Fig. 3 is the right view of battery saver of the band encapsulated layer of another embodiment of providing of the utility model.
Fig. 4 is the right view of battery saver of the band hard case chip of the embodiment again that provides of the utility model.
Fig. 5 is equipped with the protective circuit figure that battery saver is installed that the utility model provides.
Mark among the figure:
The 1-battery saver,
The 2-substrate,
The 31-first film conductive layer, 311-first connecting portion, 312-middle interconnecting piece, 313-second connecting portion, the 32-second film conductive layer,
41-the one PTC element, 42-the 2nd PTC element,
The 5-heating resistor,
61-first lead-in wire, 62-second go between, 63-the 3rd goes between,
71-encapsulated layer, 72-hard case chip,
81-charging control FET, 82-discharge control FET,
The 9-control IC,
C-protective circuit, A/B/D-protective circuit splicing ear, E-secondary cell, T-triode.
Embodiment
Clearer for technical problem, technical scheme and beneficial effect that the utility model is solved, below in conjunction with accompanying drawing and embodiment, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Consult Fig. 2, the utility model provides a kind of battery saver 1, comprising: substrate 2, the first film conductive layers 31, the second film conductive layers 32, heating resistor 5, the one PTC elements 41, the two PTC elements 42, the first lead-in wires 61, the second lead-in wires the 62 and the 3rd lead-in wire 63; The said first film conductive layer 31 and the second film conductive layer 32 are formed at the end face of substrate 2, and the first film conductive layer 31 is not connected with the second film conductive layer 32 mutually; Said heating resistor 5 is positioned at substrate top surface, and its two ends are connected with the second film conductive layer 32 with the first film conductive layer 31 respectively; A said PTC element 41 and the 2nd PTC element 42 all are formed with pair of electrodes in its relative both sides, and a utmost point of a said PTC element 41 is connected with the first film conductive layer 31, and first lead-in wire 61 is connected with another utmost point of a PTC element 41 and is drawn out to outside the substrate 2; One utmost point of said the 2nd PTC element 42 is connected with the first film conductive layer 31, and second lead-in wire 62 is connected with another utmost point of the 2nd PTC element 42 and is drawn out to outside the substrate 2; Said the 3rd lead-in wire 63 is connected with the second film conductive layer 32 and is drawn out to outside the substrate 2.
Describe in detail in the face of battery saver 1 each several part down.
Consult Fig. 1, for the sketch map of first, second film conductive layer and heating resistor 5 is set on the substrate 2.Substrate 2 is processed by insulating material, and has good heat-conducting, can but to be not limited to be that thickness is the Al of 0.25-0.45mm
2O
3Pottery or ZrO
2Pottery; Perhaps thickness is epoxy resin or other resins of 0.4-0.6mm.
First, second film conductive layer can utilize known method to be formed on the substrate 2, for example printed silver, silver palladium alloy electrocondution slurry on ceramic substrate 2; The perhaps complex metal layer of brush plating copper, nickel and gold on resin substrate 2, thus first, second film conductive layer on substrate 2, formed, and first, second film conductive layer is not electrically connected mutually.
In an embodiment shown in Figure 1, substrate 2 is a rectangular plate shape; The first film conductive layer 31 is inverted U-shaped, is arranged at the end face of substrate 2, and further comprises first connecting portion 311, second connecting portion 313 and connect the middle interconnecting piece 312 of first connecting portion 311 and second connecting portion 313; The second film conductive layer 32 is arranged between first connecting portion 311 and second connecting portion 313.
Known first, second PTC element 41 and 42 is the thermistors with positive temperature coefficient, is preferably the high-molecule metal PTC element that internal resistance is low, the PTC effect is strong.First, second PTC element 41 and 42 all is formed with pair of electrodes in its relative both sides, is provided with conducting polymer between the electrode, and its operation principle is when first, second PTC element 41 and 42 flows through big electric current; Element produces great amount of heat and can not distribute timely; Cause polymer temperature to rise, when temperature reached material crystals melt temperature, polymer sharply expanded; The conductive path that blocking-up is made up of conducting particles; Cause resistance to rise rapidly, limited big electric current and passed through, thereby played overcurrent protection.
Like Fig. 2; On first connecting portion 311 of the first film conductive layer 31 and second connecting portion 313, weld a PTC element 41 and the 2nd PTC element 42 through the mode of Reflow Soldering respectively; One utmost point of the one PTC element 41 is electrically connected with first connecting portion 311, and a utmost point of the 2nd PTC element 42 is electrically connected with second connecting portion 313.
As stated, after a PTC element 41 is welded on first connecting portion 311, above another utmost point of a PTC element 41 is positioned at; Be used for being connected with an end of first lead-in wire 61; Be preferably welding, the other end of first lead-in wire 61 stretches out from substrate 2, is convenient to be connected in the protective circuit.Under the preferable case, the junction of first lead-in wire the 61 and the one PTC element 41 is coated with tin, to strengthen solderability and bonding strength.Second lead-in wire 62 is also being connected with the 2nd PTC element 42 with first lead-in wire, 61 identical modes, and second go between the 62 and the 2nd PTC element 42 the junction also be coated with tin.
One end of the 3rd lead-in wire 63 is connected with the second film conductive layer 32, and is coated with tin in the junction; The other end of the 3rd lead-in wire stretches out from substrate 2.
More than, the material of first, second, third lead-in wire can be selected but not comprise nickel strap, nickel plated steel strip, copper strips, is preferably nickel strap.
In a preferred embodiment; Like Fig. 3, at the end face of substrate 2, the one side that promptly is welded with first, second PTC element 41 and 42 is coated with encapsulated layer 71; To reach antirust, moistureproof purpose, can guarantee concentrated first, second PTC element 41 and 42 that conducts to of heat that heating resistor 5 produces simultaneously.For example can select but be not limited to cold setting resin layer, epoxy resin layer, UV glue-line etc. to encapsulate, be coated on the encapsulated layer 71 on the substrate 2 thereby form.
Further,, on encapsulated layer 71, be provided with hard case chip 72, with structural strength and the effective control product design that improves battery saver 1 like Fig. 4.This hard case chip 72 can be selected but be not limited to the Al with good heat conductive, insulation property that thickness is 0.25-0.35mm
2O
3Pottery or ZrO
2Pottery or polyamide.
Introduce the course of action of the utility model battery saver 1 below; Battery saver 1 is installed in the battery protecting circuit; Like Fig. 5; Battery has protective circuit C, secondary cell E, control IC 9, and triode T among the figure, and secondary cell E is rechargeable secondary cell such as lithium rechargeable battery, nickel-hydrogen secondary cell or NI-G secondary cell for example.Protective circuit is that the protection secondary cell avoids overcharging or crossing the protective circuit of putting.Protective circuit has splicing ear A, B, D; And the battery saver of the utility model; It is understandable that; The end that first lead-in wire 61 of battery saver 1 stretches out substrate 2 forms splicing ear A, and the end that second lead-in wire 62 stretches out substrate 2 forms splicing ear B, and the end that the 3rd lead-in wire 63 stretches out substrate 2 forms splicing ear D.Splicing ear A is connected with the positive pole of secondary cell with a discharge control FET 82 series connection backs; Splicing ear B controls an end that is connected to charging device or external equipment after FET 81 connects with a charging, and the other end of charging device or external equipment is connected to the negative pole of secondary cell.Control IC 9 respectively with discharge control FET 82, charging control FET 81, and triode T be connected, to control their break-make.
Battery is under the situation of overcharging, and when charging control FET 81 lost efficacy, control IC 9 control triode T connected; Electric current from splicing ear B through the 2nd PTC element 42; Flow to heating resistor 5, heating resistor 5 produces heat, and conducts to first, second PTC element 41 and 42 through substrate 2 and encapsulated layer 71, hard case chip 72; If the temperature of first, second PTC element 41 and 42 reaches operating temperature; First, second PTC element 41 and 42 breaks off to cut off electric current, becomes the additives for overcharge protection state, and the protection secondary cell is avoided overcharging.
Battery is under over-discharge situation, and when discharge control FET 82 lost efficacy, control IC 9 control triode T connected; Electric current from splicing ear A through a PTC element 41; Flow to heating resistor 5, heating resistor 5 produces heat, and conducts to first, second PTC element 41 and 42 through substrate 2 and encapsulated layer 71, hard case chip 72; If the temperature of first, second PTC element 41 and 42 reaches operating temperature; First, second PTC element 41 and 42 breaks off to cut off electric current, becomes the over state, and the protection secondary cell is avoided overdischarge.
When control IC 9 also lost efficacy, first, second PTC element 41 and 42 can excite the PTC effect of self through big electric current, with breaking circuit, realized multiple protective.
The above is merely the preferred embodiment of the utility model; Not in order to restriction the utility model; Any modification of being done within all spirit and principles at the utility model, be equal to replacement and improvement etc., all should be included within the protection range of the utility model.
Claims (9)
1. a battery saver is characterized in that, comprising: substrate (2); The first film conductive layer (31), the second film conductive layer (32), heating resistor (5); The one PTC element (41); The 2nd PTC element (42), first lead-in wire (61), second lead-in wire (62) and the 3rd lead-in wire (63);
The said first film conductive layer (31) and the second film conductive layer (32) are formed at the end face of substrate (2), and the first film conductive layer (31) is not connected with the second film conductive layer (32) mutually; Said heating resistor (5) is positioned at substrate (2) end face, and its two ends are connected with the second film conductive layer (32) with the first film conductive layer (31) respectively; A said PTC element (41) and the 2nd PTC element (42) all are formed with pair of electrodes in its relative both sides; One utmost point of a said PTC element (41) is connected with the first film conductive layer (31), and first lead-in wire (61) is connected with another utmost point of a PTC element (41) and is drawn out to outside the substrate (2); One utmost point of said the 2nd PTC element (42) is connected with the first film conductive layer (31), and second lead-in wire (62) is connected with another utmost point of the 2nd PTC element (42) and is drawn out to outside the substrate (2); Said the 3rd lead-in wire (63) is connected with the second film conductive layer (32) and is drawn out to outside the substrate (2).
2. battery saver as claimed in claim 1 is characterized in that: the end face of said substrate (2) is coated with encapsulated layer (71).
3. battery saver as claimed in claim 2 is characterized in that: said encapsulated layer (71) is cold setting resin layer or epoxy resin layer or UV glue-line.
4. battery saver as claimed in claim 2 is characterized in that: said encapsulated layer (71) is provided with hard case chip (72).
5. battery saver as claimed in claim 1; It is characterized in that: the said first film conductive layer (31) is inverted U-shaped, comprises first connecting portion (311), second connecting portion (313) and connects first connecting portion and the middle interconnecting piece of second connecting portion (312); A said PTC element (41) is connected with first connecting portion, and the 2nd PTC element (42) is connected with second connecting portion, and an end of heating resistor (5) is connected with middle interconnecting piece.
6. battery saver as claimed in claim 5 is characterized in that: the said second film conductive layer (32) is arranged between first connecting portion (311) and second connecting portion (313).
7. battery saver as claimed in claim 1 is characterized in that: said substrate (2) is ceramic wafer or epoxy resin board.
8. battery saver as claimed in claim 1 is characterized in that: said heating resistor (5) is ruthenium oxide resistance or Chip-R.
9. battery saver as claimed in claim 1 is characterized in that: said first lead-in wire (61), second lead-in wire (62), and the 3rd lead-in wire (63) all be coated with tin with the junction of a PTC element (41), the 2nd PTC element (42) and the second film conductive layer (32) respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205520926U CN202434623U (en) | 2011-12-27 | 2011-12-27 | Battery protection element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205520926U CN202434623U (en) | 2011-12-27 | 2011-12-27 | Battery protection element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202434623U true CN202434623U (en) | 2012-09-12 |
Family
ID=46784043
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205520926U Expired - Lifetime CN202434623U (en) | 2011-12-27 | 2011-12-27 | Battery protection element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202434623U (en) |
-
2011
- 2011-12-27 CN CN2011205520926U patent/CN202434623U/en not_active Expired - Lifetime
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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 |
Granted publication date: 20120912 |
|
| CX01 | Expiry of patent term |