CN113169002A - Protection element and protection circuit - Google Patents
Protection element and protection circuit Download PDFInfo
- Publication number
- CN113169002A CN113169002A CN201980076085.2A CN201980076085A CN113169002A CN 113169002 A CN113169002 A CN 113169002A CN 201980076085 A CN201980076085 A CN 201980076085A CN 113169002 A CN113169002 A CN 113169002A
- Authority
- CN
- China
- Prior art keywords
- fuse element
- thermal
- electrode portion
- fuse
- protection
- Prior art date
- 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.)
- Pending
Links
- 230000001681 protective effect Effects 0.000 claims abstract description 43
- 239000000463 material Substances 0.000 claims description 48
- 239000000758 substrate Substances 0.000 description 15
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- 229910000679 solder Inorganic materials 0.000 description 12
- 229910052709 silver Inorganic materials 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 238000005520 cutting process Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000020169 heat generation Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 2
- 239000006229 carbon black Substances 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 229910052763 palladium Inorganic materials 0.000 description 2
- 229910052697 platinum Inorganic materials 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 229910001925 ruthenium oxide Inorganic materials 0.000 description 2
- WOCIAKWEIIZHES-UHFFFAOYSA-N ruthenium(iv) oxide Chemical compound O=[Ru]=O WOCIAKWEIIZHES-UHFFFAOYSA-N 0.000 description 2
- 229910016315 BiPb Inorganic materials 0.000 description 1
- 229910016314 BiPbSn Inorganic materials 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- 239000004593 Epoxy Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910007637 SnAg Inorganic materials 0.000 description 1
- 229910007116 SnPb Inorganic materials 0.000 description 1
- 229910006913 SnSb Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000007639 printing Methods 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H37/00—Thermally-actuated switches
- H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
- H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/055—Fusible members
- H01H85/06—Fusible members characterised by the fusible material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/055—Fusible members
- H01H85/08—Fusible members characterised by the shape or form of the fusible member
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Fuses (AREA)
- Protection Of Static Devices (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
A protection element has a 1 st fuse element and a 2 nd fuse element connected in series. The protective element is constructed in the following manner: when overcurrent flows through the 1 st fuse element and the 2 nd fuse element, the 1 st fuse element is disconnected before the 2 nd fuse element.
Description
Technical Field
The present invention relates to a protection element and a protection circuit, and for example, to a protection element and a protection circuit connected between a secondary battery and a charger in a charge/discharge circuit of the secondary battery.
The present application claims priority based on Japanese application No. 2018-220365 filed in 11/26/2018, the contents of which are incorporated herein by reference.
Background
Conventionally, a protection circuit is mounted in various mobile devices such as a mobile phone and a portable computer, which are equipped with a secondary battery. As a mobile device having a conventional protection circuit mounted thereon, for example, there is a secondary battery device configured as follows: the present invention relates to a rechargeable battery pack including a power storage device (secondary battery), a plurality of protection circuits, and 1 st and 2 nd output terminals, wherein each of the protection circuits includes two fuse elements connected in series, and when an external circuit is connected to the 1 st and 2 nd output terminals, a discharge current supplied from the power storage device to the external circuit and a charge current supplied from the external circuit to the power storage device flow through the two fuse elements connected in series in the plurality of protection circuits (patent document 1).
The secondary battery device is configured in the following manner: the protection circuit includes heaters each having one end connected to a connection point between the fuse elements, and each heater has the other end connected to one end of a rectifying element, and each rectifying element has the other end connected to a switching element. In the secondary battery device, at least two rectifying elements are inserted in a current path connecting terminals of heaters of the protection circuit to each other, and even if a voltage difference is generated between the terminals of the heaters of the two protection circuits in a state where a short-circuit current flows and one of the fuse elements is blown, at least one of the rectifying elements is reversely biased. Therefore, current does not flow from the terminal of the heater of one protection circuit to the terminal of the heater of the other protection circuit, and a residual current caused thereby is not generated.
As a conventional protective element, the following protective elements have been proposed: a plurality of fuse elements are arranged between a plurality of electrodes as an input source of an energization path, and current is interrupted by fusing of the fuse elements by heat generation of an energized heating element. In the protection element, when current is passed through a specific current passage connected to a specific fuse element among the plurality of fuse elements, the other fuse elements are blown before the specific fuse element, and thus, the blowing time of the plurality of fuse elements is controlled. And is constructed in the following manner: the specific electrode to which the specific fuse element is connected is an electrode that is an input source of an energization path through which energization is positively conducted among the plurality of electrodes, and distances from the plurality of fuse elements to the heating element are different so that a fusing time of the specific fuse element is longer than fusing times of other fuse elements (patent document 2).
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2004-
Patent document 2: japanese patent laid-open publication No. 2010-165685
Disclosure of Invention
Problems to be solved by the invention
However, the protection circuit of patent document 1 has a problem that a plurality of rectifier elements (diodes) corresponding to a plurality of heaters one by one must be mounted to prevent an overcurrent as a whole system, and the device configuration is complicated, and the manufacturability is not satisfactory, and the manufacturing cost is high.
In the protection element of patent document 2, it is possible to specify a configuration of "a fuse element which is to be blown at the end of the fuse element" in one protection element, and at least when current is passed through a current passage connected to the fuse element, all other fuse elements are blown at first to stop only heat generation of the heat generation resistor, and there is no problem of preventing overcurrent and overvoltage in a plurality of protection circuits connected in parallel, and there is no mention that prevention of overcurrent and overvoltage is sufficient.
In recent years, mobile devices have been further improved in performance and function, and therefore, as the charge capacity of secondary batteries has further increased, a highly safe protection circuit capable of reliably preventing overcurrent and overvoltage has been required.
The invention aims to provide a protection element and a protection circuit which can reliably prevent overcurrent and overvoltage and improve safety by a simpler device structure than the prior art, and can realize good manufacturability and cost reduction.
Means for solving the problems
In order to achieve the above object, the present invention provides the following aspects.
[1] A kind of protection element is disclosed, which is composed of a base,
comprising:
a 1 st fuse element and a 2 nd fuse element connected in series,
A heater connected between the 1 st fuse element and the 2 nd fuse element,
A 1 st electrode portion connected to the 1 st fuse element on the opposite side of the 2 nd fuse element,
A 2 nd electrode portion connected to the 2 nd fuse element on the opposite side of the 1 st fuse element, and
a 3 rd electrode part connected between the 1 st fuse element and the 2 nd fuse element and connected in series with the heater,
is constructed in the following manner: when an overcurrent flows through the 1 st fuse element and the 2 nd fuse element or an overvoltage is applied to a secondary battery connected to a protection circuit, the 1 st fuse element is disconnected before the 2 nd fuse element.
[2] The protective element according to the above [1],
the aforementioned 1 st fuse element has thermal characteristics different from those of the 2 nd fuse element,
the thermal characteristics of the 1 st fuse element and the thermal characteristics of the 2 nd fuse element include at least one of a thermal resistance and a thermal capacity.
[3] The protective member according to the above [2],
the 1 st fuse element and the 2 nd fuse element are fuse elements,
the length of the 1 st fuse element is longer than the length of the 2 nd fuse element, the cross-sectional area of the 1 st fuse element in the width direction is smaller than the cross-sectional area of the 2 nd fuse element in the width direction, and/or the thermal conductivity of the material forming the 1 st fuse element is smaller than the thermal conductivity of the material forming the 2 nd fuse element.
[4] The protective element according to any one of the above [1] to [3],
the 1 st electrode portion has thermal characteristics different from the thermal characteristics of the 2 nd electrode portion,
the thermal characteristics of the 1 st electrode portion and the thermal characteristics of the 2 nd electrode portion include at least one of a thermal resistance and a thermal capacity.
[5] The protective element according to item [4] above, wherein the thermal conductivity of the material forming the 1 st electrode portion is lower than the thermal conductivity of the material forming the 2 nd electrode portion.
[6] The protective element according to any one of the above [1] to [5],
further comprising:
a 1 st conduction part for conducting the 1 st electrode part with an external circuit, and
a 2 nd conduction part for conducting the 2 nd electrode part with an external circuit,
the 1 st conduction part has a thermal characteristic different from that of the 2 nd conduction part,
the thermal characteristics of the 1 st conductive part and the thermal characteristics of the 2 nd conductive part include at least one of thermal resistance and thermal capacity.
[7] The protective element according to item [6] above, wherein a cross-sectional area in a width direction of the 1 st conduction part is smaller than a cross-sectional area in a width direction of the 2 nd conduction part, and/or a thermal conductivity of a material forming the 1 st conduction part is smaller than a thermal conductivity of a material forming the 2 nd conduction part.
[8] A protection circuit having a plurality of protection elements connected in parallel,
each of the plurality of protection elements includes:
a 1 st fuse element and a 2 nd fuse element connected in series,
A heater connected between the 1 st fuse element and the 2 nd fuse element,
A 1 st electrode portion connected to the 1 st fuse element on the opposite side of the 2 nd fuse element,
A 2 nd electrode portion connected to the 2 nd fuse element on the opposite side of the 1 st fuse element, and
a 3 rd electrode part connected between the 1 st fuse element and the 2 nd fuse element and connected in series with the heater,
a plurality of the 1 st fuse elements constituting the plurality of protection elements are connected to the same pole,
is constructed in the following manner: when an overcurrent flows through the 1 st fuse element and the 2 nd fuse element constituting the plurality of protection elements, respectively, or when an overvoltage is applied to a secondary battery connected to a protection circuit, the 1 st fuse element of the protection elements is disconnected earlier than the 2 nd fuse element.
[9] The protection circuit according to the above [8],
the 1 st fuse element has thermal characteristics different from those of the 2 nd fuse element,
the thermal characteristics of the 1 st fuse element and the thermal characteristics of the 2 nd fuse element include at least one of a thermal resistance and a thermal capacity.
[10] The protection circuit according to item [9], wherein the length of the 1 st fuse element is longer than the length of the 2 nd fuse element, the cross-sectional area of the 1 st fuse element in the width direction is smaller than the cross-sectional area of the 2 nd fuse element in the width direction, and/or the resistivity of a material forming the 1 st fuse element is larger than the resistivity of a material forming the 2 nd fuse element.
[11] The protection circuit according to any one of [8] to [10],
the 1 st electrode portion has thermal characteristics different from the thermal characteristics of the 2 nd electrode portion,
the thermal characteristics of the 1 st electrode portion and the thermal characteristics of the 2 nd electrode portion include at least one of a thermal resistance and a thermal capacity.
[12] According to the protection circuit described in the above [11], the thermal conductivity of the material forming the 1 st electrode portion is smaller than the thermal conductivity of the material forming the 1 st electrode portion.
[13] The protection circuit according to any one of [8] to [12] above,
each of the plurality of protective elements further includes:
a 1 st conduction part for conducting the 1 st electrode part with an external circuit, and
a 2 nd conduction part for conducting the 2 nd electrode part with an external circuit,
the 1 st conduction part has a thermal characteristic different from that of the 2 nd conduction part,
the thermal characteristics of the 1 st conductive part and the thermal characteristics of the 2 nd conductive part include at least one of thermal resistance and thermal capacity.
[14] The protection circuit according to item [13], wherein a cross-sectional area in a width direction of the 1 st conduction part is smaller than a cross-sectional area in a width direction of the 2 nd conduction part, and/or a thermal conductivity of a material forming the 1 st conduction part is smaller than a thermal conductivity of a material forming the 2 nd conduction part.
[15] The protection circuit according to any one of [8] to [14] above,
further comprises:
a plurality of 1 st connecting parts disposed between the plurality of 1 st conductive parts and the external circuit, and a plurality of 2 nd connecting parts disposed between the plurality of 2 nd conductive parts and the external circuit,
the 1 st connection parts respectively connected to the 1 st conduction parts of the plurality of protection elements have thermal characteristics different from the thermal characteristics of the 2 nd connection parts connected to the 2 nd conduction parts of the protection elements,
the thermal characteristics of the 1 st connection portion and the thermal characteristics of the 2 nd connection portion include at least one of thermal resistance and thermal capacity.
[16] The protection circuit according to item [15], wherein the length of the 1 st connection part is longer than the length of the 2 nd connection part, and/or the width-directional cross-sectional area of the 1 st connection part is smaller than the width-directional cross-sectional area of the 2 nd connection part.
Effects of the invention
According to the present invention, it is possible to reliably prevent overcurrent and overvoltage and improve safety with a simpler device configuration than in the related art, and it is possible to achieve good manufacturability and cost reduction.
Drawings
Fig. 1 is a plan view schematically showing the structure of a protective element according to embodiment 1 of the present invention.
Fig. 2 is a sectional view of the protective member at a cutting line II-II of fig. 1.
Fig. 3 is a plan view schematically showing the structure of a protective element according to embodiment 2 of the present invention.
Fig. 4 is a plan view schematically showing the structure of a protective element according to embodiment 3 of the present invention.
Fig. 5 is a sectional view of the protective member at a cutting line V-V of fig. 4.
Fig. 6 is a plan view schematically showing the structure of a protective element according to embodiment 4 of the present invention.
Fig. 7 is a plan view schematically showing the structure of a protective element according to embodiment 5 of the present invention.
Fig. 8 is a plan view schematically showing the structure of a protective element according to embodiment 6 of the present invention.
Fig. 9 is a sectional view of the protective member at the cutting line IX-IX of fig. 8.
Fig. 10 is a plan view schematically showing the structure of a protective element according to embodiment 7 of the present invention.
Fig. 11 is a sectional view of the protective member at a cutting line XI-XI of fig. 10.
Fig. 12 is a plan view schematically showing the configuration of a protection circuit according to embodiment 8 of the present invention.
Fig. 13 is a circuit diagram for explaining the operation of the protection circuit of fig. 12, and shows a state before the disconnection operation.
Fig. 14 is a circuit diagram for explaining the operation of the protection circuit of fig. 12, and shows a state after the disconnection operation.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[ constitution of protective element ]
Fig. 1 is a plan view schematically showing the structure of a protective element according to embodiment 1 of the present invention, and fig. 2 is a sectional view of the protective element at cut line II-II in fig. 1.
As shown in fig. 1 and 2, the protection element 10 includes a substrate 11, a 1 st fuse element 12A and a 2 nd fuse element 13A connected in series on the substrate 11, a heater 14 connected between the 1 st fuse element 12A and the 2 nd fuse element 13A, a 1 st electrode portion 15A connected to the 1 st fuse element 12A on the opposite side to the 2 nd fuse element 13A, a 2 nd electrode portion 16A connected to the 2 nd fuse element 13A on the opposite side to the 1 st fuse element 12A, a 3 rd electrode portion 17 connected between the 1 st fuse element 12A and the 2 nd fuse element 13A and connected in series to the heater 14, a 1 st conductive portion 18A for conducting the 1 st electrode portion 15A to an external circuit, and a 2 nd conductive portion 19A for conducting the 2 nd electrode portion 16A to the external circuit. The protection element 10 is configured as follows: when an overcurrent flows through the 1 st fuse element 12A and the 2 nd fuse element 13A or when an overvoltage is applied to a secondary battery (see fig. 13 and 14) connected to a protection circuit, the 1 st fuse element 12A is disconnected before the 2 nd fuse element 13A. The configuration and operation of the secondary battery connected to the protection circuit when an overvoltage is applied thereto are described below.
The substrate 11 is not particularly limited as long as it is made of an insulating material, and for example, a glass substrate, a resin substrate, an insulating-treated metal substrate, or the like may be used in addition to a substrate used for a printed wiring board such as a ceramic substrate or a glass epoxy substrate. Among them, a ceramic substrate is preferable as an insulating substrate having excellent heat resistance and good thermal conductivity.
The 1 st fuse element 12A and the 2 nd fuse element 13A are integrally formed in this embodiment, and are supported by the 1 st electrode portion 15A, the 2 nd electrode portion 16A, and the 3 rd electrode portion 17 via three conductive support members 21, 22, and 23.
The 1 st fuse element 12A and the 2 nd fuse element 13A may be formed of different members. The 1 st fuse element 12A and the 2 nd fuse element 13A are not limited to a sheet shape, and may be rod-shaped.
1 stThe fuse element 12A has thermal characteristics different from those of the 2 nd fuse element 13A, and the thermal characteristics of the 1 st fuse element 12A and the thermal characteristics of the 2 nd fuse element 13A include at least one of thermal resistance and thermal capacity. Heat resistance (K/W) means ease of heat transfer, and the greater the heat resistance, the more difficult the heat transfer (heat resistance [ K/W ]]Length [ m ═ length]/{ Cross-sectional area [ m ]2]X thermal conductivity [ W/(m.K)]}). The heat capacity (J/K) means the amount of heat necessary to raise the unit temperature, that is, the ease of temperature change, and the greater the heat capacity, the more difficult the temperature change. Therefore, for example, (1) the thermal resistance of the 1 st fuse element 12A is larger than that of the 2 nd fuse element 13A, (2) the thermal capacity of the 1 st fuse element 12A is smaller than that of the 2 nd fuse element 13A, or (3) both of the above-described (1) to (2) are satisfied.
Specifically, the 1 st fuse element 12A and the 2 nd fuse element 13A have, for example, a sheet shape. In the present embodiment, the length of the 1 st fuse element 12A is longer than the length of the 2 nd fuse element 13A. In this case, since the thermal resistance of the 1 st fuse element 12A is higher than that of the 2 nd fuse element 13A, when an overcurrent flows through the 1 st fuse element 12A and the 2 nd fuse element 13A, the 1 st fuse element 12A is disconnected earlier than the 2 nd fuse element 13A.
As the material constituting the 1 st fuse element 12A and the 2 nd fuse element 13A, various low melting point metals that have been conventionally used as fuse materials can be used. Examples of the low melting point metal include SnSb alloy, BiSnPb alloy, BiPbSn alloy, BiPb alloy, BiSn alloy, SnPb alloy, SnAg alloy, PbIn alloy, ZnAl alloy, InSn alloy, and PbAgSn alloy. The materials constituting the 1 st fuse element 12A and the 2 nd fuse element 13A are preferably the same, and may be different.
The heater 14 is disposed on the substrate 11 and directly below the 3 rd electrode portion 17. An insulating layer 24 is disposed between the heater 14 and the 3 rd electrode portion 17. One end of the heater 14 is connected to the heater lead electrode portion 14A, and the other end is connected to the 3 rd electrode portion 17 via the relay electrode portion 17A.
The heater 14 may be formed, for example, by: a resistor paste containing a conductive material such as ruthenium oxide or carbon black, an inorganic binder such as water glass, or an organic binder such as a thermosetting resin is applied and fired as necessary. The heater 14 may be formed by a thin film of ruthenium oxide, carbon black, or the like through printing, plating, vapor deposition, or sputtering, or may be formed by pasting, laminating, or the like of these films.
The 1 st electrode portion 15A, the 2 nd electrode portion 16A, and the 3 rd electrode portion 17 are electrodes into which the melted 1 st fuse element 12A or the melted 2 nd fuse element 13A flows, respectively. The material constituting the 1 st electrode portion 15A, the 2 nd electrode portion 16A, and the 3 rd electrode portion 17 is not particularly limited, and a metal having good wettability with the 1 st fuse element 12A or the 2 nd fuse element 13A in a molten state may be used. For example, as the material constituting the 1 st electrode portion 15A, the 2 nd electrode portion 16A, and the 3 rd electrode portion 17, a material formed of a simple metal such as copper or the like, or a material at least the surface of which is made of Ag, Ag — Pt, Ag — Pd, Au, or the like can be used. The 1 st electrode portion 15A and the 2 nd electrode portion 16A are connected to a 1 st connection portion and a 2 nd connection portion, which will be described later, via solder portions 25 and 26, respectively. The 3 rd electrode portion 17 is connected to a 3 rd connection portion not shown in the drawings via a solder portion 27. As the material constituting the heater lead electrode portion 14A and the routing electrode portion 17A, a material formed of a simple metal such as copper, at least the surface of which is made of Ag, Ag — Pt, Ag — Pd, Au, or the like can be used, similarly to the 1 st electrode portion 15A, the 2 nd electrode portion 16A, and the 3 rd electrode portion 17. The heater lead electrode portion 14A is connected to a switching element described later via a solder portion 27.
The 1 st via 18A and the 2 nd via 19A are, for example, through holes, and are formed by filling an inner peripheral surface of a through hole formed in the substrate 11 with a conductor. The material constituting the 1 st conductive part 18A and the 2 nd conductive part 19A includes silver, copper, tungsten, or an alloy thereof. The 1 st conductive part 18A and the 2 nd conductive part 19A may be configured to be conductive to an external circuit, and may be configured other than through holes. The protection element 10 may have no 1 st conduction part 18A or no 2 nd conduction part 19A.
Fig. 3 is a plan view schematically showing the structure of the protective element according to embodiment 2 of the present invention. Since the protective element according to embodiment 2 is the same as the protective element according to embodiment 1 except that the configuration of the 1 st and 2 nd fuse elements is different, the description of the overlapping portions will be omitted, and the different portions will be described below.
As shown in fig. 3, in embodiment 2, the width of the 1 st fuse element 12B may be smaller than the width of the 2 nd fuse element 13B. In this case, since the 1 st fuse element 12B has a smaller cross-sectional area in the width direction than the 2 nd fuse element 13B, and the 1 st fuse element 12B has a higher thermal resistance than the 2 nd fuse element 13B, the 1 st fuse element 12B is disconnected earlier than the 2 nd fuse element 13B when an overcurrent flows through the 1 st fuse element 12B and the 2 nd fuse element 13B or an overvoltage is applied to a secondary battery connected to a protection circuit.
The length of the 1 st fuse element 12B is the same as the length of the 2 nd fuse element 13B, but the length of the 1 st fuse element 12B may be longer than the length of the 2 nd fuse element 13B. Thereby, the thermal resistance of the 1 st fuse element 12B can be further made larger than that of the 2 nd fuse element 13B.
Fig. 4 is a plan view schematically showing the structure of the protective element according to embodiment 3 of the present invention, and fig. 5 is a sectional view of the protective element at a cutting line V-V in fig. 4. The protection element according to embodiment 3 is the same as the protection element according to embodiment 1 except that the configurations of the 1 st and 2 nd fuse elements are different.
As shown in fig. 4 and 5, in embodiment 3, the thickness of the 1 st fuse element 12C may be smaller than the thickness of the 2 nd fuse element 13C. The thickness of the 1 st fuse element 12C is, for example, 0.1mm, and the thickness of the 2 nd fuse element 13C is, for example, 0.2 mm. In the present configuration as well, since the 1 st fuse element 12C has a smaller cross-sectional area in the width direction than the 2 nd fuse element 13C, and the 1 st fuse element 12C has a higher thermal resistance than the 2 nd fuse element 13C, the 1 st fuse element 12C is disconnected earlier than the 2 nd fuse element 13C when an overcurrent flows through the 1 st fuse element 12C and the 2 nd fuse element 13C or when an overvoltage is applied to a secondary battery connected to a protection circuit.
The length of the 1 st fuse element 12C is the same as the length of the 2 nd fuse element 13C, but the length of the 1 st fuse element 12C may be longer than the length of the 2 nd fuse element 13C. Note that the width of the 1 st fuse element 12C is the same as the width of the 2 nd fuse element 13C, but the width of the 1 st fuse element 12C may be smaller than the width of the 2 nd fuse element 13C. Thereby, the thermal resistance of the 1 st fuse element 12C can be further made larger than that of the 2 nd fuse element 13C.
Fig. 6 is a plan view schematically showing the structure of the protective element according to embodiment 4 of the present invention. The protection element according to embodiment 4 is the same as the protection element according to embodiment 1 except that the configurations of the 1 st and 2 nd fuse elements are different.
As shown in fig. 6, in embodiment 4, the 1 st fuse element 12D has a plurality of fuse elements 12D having the same shape, and the 2 nd fuse element 13D has a plurality of fuse elements 13D having the same shape, and further, the number of fuse elements constituting the 1 st fuse element 12D may be smaller than the number of fuse elements constituting the 2 nd fuse element 13D. In the present configuration as well, since the sum of the cross-sectional areas in the width direction of the plurality of fuse elements 12D is smaller than the sum of the cross-sectional areas in the width direction of the plurality of fuse elements 13D, and the thermal resistance of the 1 st fuse element 12D is larger than the thermal resistance of the 2 nd fuse element 13D, the 1 st fuse element 12D is disconnected earlier than the 2 nd fuse element 13D when an overcurrent flows through the 1 st fuse element 12D and the 2 nd fuse element 13D or an overvoltage is applied to a secondary battery connected to a protection circuit.
The length of the 1 st fuse element 12D is the same as the length of the 2 nd fuse element 13D, but the length of the 1 st fuse element 12D may be longer than the length of the 2 nd fuse element 13D. Note that the width of the fuse element 12D constituting the 1 st fuse element 12D is the same as the width of the fuse element 13D constituting the 2 nd fuse element 13D, but the width of the fuse element 12D may be smaller than the width of the fuse element 13D. Further, the thickness of the 1 st fuse element 12D may be smaller than the thickness of the 2 nd fuse element 13D. Thereby, the thermal resistance of the 1 st fuse element 12D can be further made larger than that of the 2 nd fuse element 13D.
Fig. 7 is a plan view schematically showing the structure of the protective element according to embodiment 5 of the present invention. The protection element according to embodiment 5 is the same as the protection element according to embodiment 1 except that the configurations of the 1 st and 2 nd fuse elements are different.
As shown in fig. 7, in the present embodiment 5, the thermal conductivity of the material forming the 1 st fuse element 12E may be smaller than the thermal conductivity of the material forming the 2 nd fuse element 13E. In the present configuration as well, since the thermal resistance of the 1 st fuse element 12E is higher than that of the 2 nd fuse element 13E, the 1 st fuse element 12E is disconnected earlier than the 2 nd fuse element 13E when an overcurrent flows through the 1 st fuse element 12E and the 2 nd fuse element 13E or an overvoltage is applied to a secondary battery connected to a protection circuit.
The length of the 1 st fuse element 12E is the same as the length of the 2 nd fuse element 13E, but the length of the 1 st fuse element 12E may be longer than the length of the 2 nd fuse element 13E. Note that the width of the 1 st fuse element 12E is the same as the width of the 2 nd fuse element 13E, but the width of the 1 st fuse element 12E may be smaller than the width of the 2 nd fuse element 13E. Further, the thickness of the 1 st fuse element 12E may be smaller than the thickness of the 2 nd fuse element 13E. Thereby, the thermal resistance of the 1 st fuse element 12E can be further made larger than that of the 2 nd fuse element 13E.
In this manner, it is preferable that the 1 st fuse elements 12A to 12E and the 2 nd fuse elements 13A to 13E are fuse elements, and the length of the 1 st fuse element 12A is longer than the length of the 2 nd fuse element 13A, the sectional area of the 1 st fuse element 12B (12C, 12D) is smaller than the sectional area of the 2 nd fuse element 13B (13C, 13D), and/or the thermal conductivity of the material forming the 1 st fuse element 12E is smaller than the thermal conductivity of the material forming the 2 nd fuse element 13E. Accordingly, when an overcurrent flows through the 1 st fuse element 12A (12B, 12C, 12D, 12E) and the 2 nd fuse element 13A (13B, 13C, 13D, 13E) or when an overvoltage is applied to the secondary battery connected to the protection circuit, the 1 st fuse element 12A (12B, 12C, 12D, 12E) is surely turned off earlier than the 2 nd fuse element 13A (13B, 13C, 13D, 13E), and safety can be further improved with an extremely simple configuration.
Fig. 8 is a plan view schematically showing the structure of a protective member according to embodiment 6 of the present invention, and fig. 9 is a sectional view of the protective member at cut line IX-IX of fig. 8. The protection element according to embodiment 6 is the same as the protection element according to embodiment 1 except that the structures of the 1 st and 2 nd electrode portions are different.
As shown in fig. 8 and 9, in embodiment 6, the 1 st electrode portion 15B has thermal characteristics different from the thermal characteristics of the 2 nd electrode portion 16B, and the thermal characteristics of the 1 st electrode portion 15B and the thermal characteristics of the 2 nd electrode portion 16B may include at least one of thermal resistance and thermal capacity. For example, (1) the thermal resistance of the 1 st electrode portion 15B is higher than that of the 2 nd electrode portion 16B, (2) the heat capacity of the 1 st electrode portion 15B is lower than that of the 2 nd electrode portion 16B, or (3) both of the above-described (1) to (2) are preferably satisfied. The thermal characteristics of the 1 st electrode portion 15B and the 2 nd electrode portion 16B are the same as those of the 1 st and 2 nd fuse elements described in the above-described embodiment 1.
In the present embodiment, the thermal conductivity of the material forming the 1 st electrode portion 15B is lower than the thermal conductivity of the material forming the 2 nd electrode portion 16B. In this case, since the thermal resistance of the 1 st electrode portion 15B is higher than that of the 2 nd electrode portion 16B, when an overcurrent flows through the 1 st fuse element 12A and the 2 nd fuse element 13A, the 1 st fuse element 12A is disconnected earlier than the 2 nd fuse element 13A, and safety can be further improved with an extremely simple configuration.
Fig. 10 is a plan view schematically showing the structure of a protective element according to embodiment 7 of the present invention, and fig. 11 is a sectional view of the protective element at cut line XI-XI in fig. 10. The protection device according to embodiment 7 is the same as the protection device according to embodiment 1 except that the configurations of the 1 st and 2 nd conduction parts are different.
As shown in fig. 10 and 11, in embodiment 6, the 1 st conductive part 18B has thermal characteristics different from the thermal characteristics of the 2 nd conductive part 19B, and the thermal characteristics of the 1 st conductive part 18B and the thermal characteristics of the 2 nd conductive part 19B may include at least one of thermal resistance and thermal capacity. For example, (1) the thermal resistance of the 1 st conduction part 18B is larger than that of the 2 nd conduction part 19B, (2) the thermal capacity of the 1 st conduction part 18B is smaller than that of the 2 nd conduction part 19B, or (3) both of the above-described (1) to (2) are satisfied. The thermal characteristics of the 1 st conductive part 18B and the 2 nd conductive part 19B have the same meanings as those of the 1 st and 2 nd fuse elements described in the above embodiment 1.
In the present embodiment, the width of the 1 st conduction part 18B is smaller than the width of the 2 nd conduction part 19B. In this case, since the cross-sectional area of the 1 st conduction part 18B in the width direction is smaller than the cross-sectional area of the 2 nd conduction part 19B in the width direction, and the thermal resistance of the 1 st conduction part 18B is larger than the thermal resistance of the 2 nd conduction part 19A, when an overcurrent flows through the 1 st fuse element 12A and the 2 nd fuse element 13A, the 1 st fuse element 12A is cut before the 2 nd fuse element 13A.
The thermal conductivity of the material forming the 1 st via 18B may be smaller than the thermal conductivity of the material forming the 2 nd via 19B. This makes it possible to further increase the thermal resistance of the 1 st conduction part 18B compared to the thermal resistance of the 2 nd conduction part 19B. When the thermal conductivity of the material forming the 1 st via 18B is smaller than the thermal conductivity of the material forming the 2 nd via 19B, the width of the 1 st via 18B is preferably smaller than the width of the 2 nd via 19B, and may be the same as the width of the 2 nd via 19B.
In this way, by making the width-directional cross-sectional area of the 1 st conduction part 18B smaller than the width-directional cross-sectional area of the 2 nd conduction part 19B and/or making the thermal conductivity of the material forming the 1 st conduction part 18B smaller than the thermal conductivity of the material forming the 2 nd conduction part 19B, when an overcurrent flows through the 1 st fuse element 12A and the 2 nd fuse element 13A, the 1 st fuse element 12A is surely cut off earlier than the 2 nd fuse element 13A, and safety can be further improved with an extremely simple configuration.
[ constitution of protection Circuit ]
Fig. 12 is a plan view schematically showing the configuration of the protection circuit according to embodiment 8 of the present invention. In embodiment 8, a case where a protection circuit includes a plurality of protection elements 10 according to embodiment 1 will be described as an example.
As shown in fig. 12, the protection circuit 1 further includes a plurality of protection elements 10, 10 connected in parallel, a plurality of 1 st connection portions 31, 31 disposed between the plurality of 1 st electrode portions 15A, 15A and the external circuit, and a plurality of 2 nd connection portions 32, 32 disposed between the plurality of 2 nd electrode portions 16A, 16A and the external circuit.
The 1 st connection portions 31, 31 are connected to the 1 st electrode portions 15A, 15A via the plurality of solder portions 25, respectively. The 2 nd connection portions 32, and 32 are connected to the 2 nd electrode portions 16A, and 16A via the plurality of solder portions 26, and 26, respectively. The plurality of 1 st connecting portions 31, 31 and the plurality of 2 nd connecting portions 32, 32 are, for example, circuit patterns mounted on a substrate. The material constituting the plurality of 1 st junctions 31, 31 and the plurality of 2 nd junctions 32, 32 is not particularly limited, and examples thereof include copper and copper alloys.
Is constructed in the following manner: the 1 st fuse elements 12A, and 12A constituting the plurality of protection elements 10, and 10 are connected to the same pole, and when an overcurrent flows through the 1 st fuse element 12A and the 2 nd fuse element 13A constituting the plurality of protection elements 10, and 10, respectively, the 1 st fuse element 12A of the protection elements is disconnected earlier than the 2 nd fuse element 13A.
In the present embodiment, the 1 st connection portion 31 connected to the 1 st fuse element 12A constituting each of the plurality of protection elements 10, 10 has a thermal characteristic different from a thermal characteristic of the 2 nd connection portion 32 connected to the 2 nd fuse element 13A of the protection element 10. Further, it is preferable that the thermal characteristics of the 1 st connection portion 31 and the thermal characteristics of the 2 nd connection portion 32 include at least one of thermal resistance and thermal capacity. For example, (1) the thermal resistance of the 1 st connection portion 31 is larger than the thermal resistance of the 2 nd connection portion 32, (2) the thermal capacity of the 1 st connection portion 31 is smaller than the thermal capacity of the 2 nd connection portion 32, or (3) both of the above-described (1) to (2) are preferably satisfied. The thermal characteristics of the 1 st connection portion 31 and the 2 nd connection portion 32 have the same meanings as those of the 1 st and 2 nd fuse elements described in the above-described embodiment 1.
In the present embodiment, the width of the plurality of 1 st junctions 31, 31 is smaller than the width of the plurality of 2 nd junctions 32, 32. In this case, since the cross-sectional area in the width direction of the 1 st connection portion 31 is smaller than the cross-sectional area in the width direction of the 2 nd connection portion 32 and the thermal resistance of the 1 st connection portion 31 is larger than the thermal resistance of the 2 nd connection portion 32, the 1 st fuse element 12A is disconnected earlier than the 2 nd fuse element 13A when an overcurrent flows through the 1 st fuse element 12A and the 2 nd fuse element 13A or an overvoltage is applied to a secondary battery connected to a protection circuit.
As described above, since the 1 st connection portion 31 is connected to the 1 st electrode portion 15A via the solder portion 25 and via the through hole or the through hole, the thermal characteristics of the 1 st connection portion 31 may be affected by the shape or material of the solder portion 25, and the thermal characteristics of the 1 st connection portion 31 may include the thermal characteristics of a joining member such as the solder portion 25. Similarly, the thermal characteristics of the 2 nd connecting portion 32 may include thermal characteristics of a joining member such as the solder portion 26. The thermal characteristics of the bonding member are the same as those of the 1 st and 2 nd fuse elements described in embodiment 1.
Fig. 13 and 14 are circuit diagrams for explaining the operation of the protection circuit 1 of fig. 12, in which fig. 13 shows a state before the disconnection operation, and fig. 14 shows a state after the disconnection operation.
In the protection circuit 1, as shown in fig. 13, for example, a plurality of 1 st connection portions 31, 31 are connected to the parallel connection point a via an external circuit and to the positive electrodes of the secondary batteries 33, 33. The plurality of 2 nd connecting parts 32, and 32 are connected to the parallel connection point B through an external circuit and to the positive electrode of the charger 34. The heater 14 connected to the 3 rd electrode portion 17 is connected to, for example, both the negative electrodes of the secondary batteries 33 and the negative electrode of the charger 34. A switching element 35 such as an FET is provided downstream of the 3 rd electrode portions 17. That is, the heater 14 located on the downstream side of the plurality of 3 rd electrode portions is connected to the switching element 35 through the heater lead electrode portion 14A at one end portion thereof, and connected to the 1 st fuse element 12A and the 2 nd fuse element 13A through the routing electrode portion 17A and the 3 rd electrode portion 17 at the other end portion thereof.
When the secondary batteries 33, 33 are charged, electric power is supplied from the charger 34 to the secondary batteries 33, 33 via an external circuit. When the secondary battery is discharged, electric power is supplied from the secondary batteries 33, 33 to an external circuit. In this way, the secondary batteries 33, 33 supply the same electric power to both the 1 st fuse element 12A and the 2 nd fuse element 13A both at the time of charging and at the time of discharging.
When overcurrent or overvoltage occurs for some reason during charging or discharging of the secondary batteries 33 and 33, the thermal resistance of the 1 st connection portion 31 is higher than that of the 2 nd connection portion 32, and therefore, as shown in fig. 14, the 1 st fuse element 12A is disconnected before the 2 nd fuse element 13A. The 1 st fuse element 12A is disconnected earlier than the 2 nd fuse element 13A in all the plurality of protection elements 10, and the circuit on the secondary battery 33 side is separated from the circuit on the charger 34 side. This prevents the current from flowing backward through the heater 14, and thus, it is not necessary to provide a rectifying element such as a diode between the plurality of protective elements 10, 10 and the switching element 35.
In the present embodiment, the length of the plurality of 1 st junctions 31, 31 is the same as the length of the plurality of 2 nd junctions 32, but the present invention is not limited to this case, and the length of the plurality of 1 st junctions 31, 31 may be different from the length of the plurality of 2 nd junctions 32, 32. Thereby, the thermal resistance of the 1 st connection portion 31 can be further made larger than that of the 2 nd connection portion 32.
In the present embodiment, the width of the plurality of 1 st connecting portions 31, 31 is different from the width of the plurality of 2 nd connecting portions 32, but the present invention is not limited to this case. When the widths of the plurality of 1 st junctions 31, 31 are the same as the widths of the plurality of 2 nd junctions 32, the lengths of the plurality of 1 st junctions 31, 31 may be different from the lengths of the plurality of 2 nd junctions 32, 32.
The protection circuit 1 may further include a detection element, not shown, connected to each of the secondary batteries 33 and to the switching element 35. The detection element constantly monitors whether or not a high voltage state, particularly an overvoltage is formed, and outputs a control signal to the switching element 35 when the high voltage state is formed. In this case, the switching element 35 causes the current from the secondary battery 33 to flow through the heater 14 in accordance with the control signal, thereby causing the heater 14 to generate heat. Thereby, the 1 st fuse element 12A is blown earlier than the 2 nd fuse element 13A.
In this way, by making the length of the 1 st connection portion 31 longer than the length of the 2 nd connection portion 32 and/or making the cross-sectional area of the 1 st connection portion 31 in the width direction smaller than the cross-sectional area of the 2 nd connection portion 32, when an overcurrent flows through the 1 st fuse element 12A and the 2 nd fuse element 13A or an overvoltage is applied to the secondary battery 33 connected to the protection circuit 1, the 1 st fuse element 12A is surely cut off earlier than the 2 nd fuse element 13A, and safety can be further improved with a very simple configuration.
In the present embodiment, the protection circuit 1 includes the protection element 10 according to embodiment 1, but is not limited to this case, and may include the protection elements according to embodiments 2 to 7. In this case, the thermal resistance of the 1 st fuse element provided in each protection element may be made larger than the thermal resistance of the 2 nd fuse element.
In the present embodiment, the thermal characteristics of the 1 st connection portion 31 and the thermal characteristics of the 2 nd connection portion 32 in the protection circuit 1 are different, but the present invention is not limited to this, and the thermal characteristics of the 1 st connection portion 31 may be the same as the thermal characteristics of the 2 nd connection portion 32 when the protection element 10 has the configuration of the above-described 1 st to 7 th embodiments. For example, the plurality of 1 st connecting portions 31, 31 may have the same cross-sectional area in the width direction as the plurality of 2 nd connecting portions 32, or the plurality of 1 st connecting portions 31, 31 may have the same thermal conductivity as the plurality of 2 nd connecting portions 32, 32.
As described above, according to the above embodiment, when an overcurrent flows through the 1 st fuse element 12A (12B, 12C, 12D, 12E) and the 2 nd fuse element 13A (13B, 13C, 13D, 13E) or when an overvoltage is applied to the secondary battery 33 connected to the protection circuit 1, the 1 st fuse element 12A (12B, 12C, 12D, 12E) is configured to open earlier than the 2 nd fuse element 13A (13B, 13C, 13D, 13E), and therefore the circuit on one side and the circuit on the other side of the 1 st fuse element 12A (12B, 12C, 12D, 12E) can be opened by the 1 st fuse element 12A (12B, 12C, 12D, 12E). Therefore, when forming a protection circuit including a plurality of protection elements 10 connected in parallel, by connecting the plurality of 1 st fuse elements 12A (12B, 12C, 12D, 12E) constituting the plurality of protection elements 10 to the same polarity, it is possible to reliably prevent overcurrent and overvoltage without providing a rectifying element such as a diode. Therefore, the protection element 10 can surely prevent overcurrent and overvoltage and improve safety with a simpler configuration than the conventional one, and can realize excellent manufacturability and cost reduction.
Further, according to the above-described embodiment, in the protection circuit including the plurality of protection elements 10 connected in parallel, the plurality of 1 st fuse elements 12A constituting the plurality of protection elements 10 are connected to the same pole, and when an overcurrent flows through the 1 st fuse elements 12A (12B, 12C, 12D, 12E) and the 2 nd fuse elements 13A (13B, 13C, 13D, 13E) constituting the plurality of protection elements 10, or when an overvoltage is applied to the secondary battery 33 connected to the protection circuit 1, the 1 st fuse elements 12A (12B, 12C, 12D, 12E) in the protection elements are configured to be disconnected earlier than the 2 nd fuse elements 13A (13B, 13C, 13D, 13E), and therefore, the 1 st fuse elements 12A (12B, 12C, 12D, 12E) can be disconnected by the 1 st fuse elements 12A (12B, 12C, 12D, 12E), 12E) The circuit on one side (e.g., secondary battery side circuit) and the circuit on the other side (e.g., charger side circuit) are disconnected. Therefore, it is possible to reliably prevent overcurrent and overvoltage without providing a plurality of rectifier elements such as diodes. Therefore, the protection circuit 1 can surely prevent overcurrent and overvoltage and improve safety with a simpler configuration than the conventional one, and can realize excellent manufacturability and cost reduction.
The embodiments of the present invention have been described above in detail, but the present invention is not limited to the above embodiments, and various modifications and changes can be made within the scope of the gist of the present invention described in the claims.
For example, in the above embodiment, the thermal characteristics of the 1 st and 2 nd fuse elements, the 1 st and 2 nd electrode portions, the 1 st and 2 nd conductive portions, or the 1 st and 2 nd connecting portions are different from each other, but the present invention is not limited to this case. The conductor resistance values (resistances (Ω)) of the 1 st and 2 nd fuse elements, the 1 st and 2 nd electrode portions, the 1 st and 2 nd conductive portions, and/or the 1 st and 2 nd connecting portions may be different from each other. With this configuration, the 1 st fuse element can be configured to be opened earlier than the 2 nd fuse element when an overcurrent flows through the 1 st fuse element and the 2 nd fuse element or when an overvoltage is applied to a secondary battery connected to a protection circuit, and thus the same effects as those described above can be achieved.
Description of the symbols
1 protective circuit
10 protective element
11 substrate
12A 1 st fuse element
12B 1 st fuse element
12C 1 st fuse element
12D 1 st fuse element
12d fuse element
12E 1 st fuse element
13A 2 nd fuse element
13B 2 nd fuse element
13C 2 nd fuse element
13D 2 nd fuse element
13d fuse element
13E 2 nd fuse element
14 heater
14A heater lead-out electrode part
15A No. 1 electrode part
15B No. 1 electrode part
16A No. 2 electrode part
16B No. 2 electrode part
17 rd 3 electrode part
17A relay electrode unit
18A 1 st conduction part
18B 1 st conduction part
19A 2 nd conduction part
19B No. 2 conduction part
21 support body
22 support body
23 support body
24 insulating layer
25 solder part
26 solder part
27 solder part
31 st connection part
32 nd 2 nd connecting part
33 Secondary Battery
34 charger
35 switching element
Claims (16)
1. A kind of protection element is disclosed, which is composed of a base,
comprising:
a 1 st fuse element and a 2 nd fuse element connected in series,
A heater connected between the 1 st fuse element and the 2 nd fuse element,
A 1 st electrode portion connected to the 1 st fuse element on the opposite side of the 2 nd fuse element,
A 2 nd electrode portion connected to the 2 nd fuse element on the opposite side of the 1 st fuse element, and
a 3 rd electrode portion connected between the 1 st fuse element and the 2 nd fuse element and connected in series with the heater,
is constructed in the following manner: when an overcurrent flows through the 1 st fuse element and the 2 nd fuse element or an overvoltage is applied to a secondary battery connected to a protection circuit, the 1 st fuse element is disconnected before the 2 nd fuse element.
2. The protective element according to claim 1, wherein,
the 1 st fuse element has a thermal characteristic different from a thermal characteristic of the 2 nd fuse element,
the thermal characteristics of the 1 st fuse element and the thermal characteristics of the 2 nd fuse element include at least one of a thermal resistance and a thermal capacity.
3. The protective element according to claim 2, wherein a length of the 1 st fuse element is longer than a length of the 2 nd fuse element, a width-directional cross-sectional area of the 1 st fuse element is smaller than a width-directional cross-sectional area of the 2 nd fuse element, and/or a thermal conductivity of a material forming the 1 st fuse element is smaller than a thermal conductivity of a material forming the 2 nd fuse element.
4. The protective element according to any one of claims 1 to 3,
the 1 st electrode portion has thermal characteristics different from the thermal characteristics of the 2 nd electrode portion,
the thermal characteristics of the 1 st electrode portion and the thermal characteristics of the 2 nd electrode portion include at least one of a thermal resistance and a thermal capacity.
5. The protective element according to claim 4, wherein a thermal conductivity of a material forming the 1 st electrode portion is smaller than a thermal conductivity of a material forming the 2 nd electrode portion.
6. The protective element according to any one of claims 1 to 5,
further comprising:
a 1 st conduction part for conducting the 1 st electrode part with an external circuit, and
a 2 nd conduction part for conducting the 2 nd electrode part with an external circuit,
the 1 st conduction part has a thermal characteristic different from a thermal characteristic of the 2 nd conduction part,
the thermal characteristics of the 1 st conductive part and the thermal characteristics of the 2 nd conductive part include at least one of a thermal resistance and a thermal capacity.
7. The protection element according to claim 6, wherein a width-directional sectional area of the 1 st via is smaller than a width-directional sectional area of the 2 nd via, and/or a thermal conductivity of a material forming the 1 st via is smaller than a thermal conductivity of a material forming the 2 nd via.
8. A protection circuit having a plurality of protection elements connected in parallel,
each of the plurality of protection elements includes:
a 1 st fuse element and a 2 nd fuse element connected in series,
A heater connected between the 1 st fuse element and the 2 nd fuse element,
A 1 st electrode portion connected to the 1 st fuse element on the opposite side of the 2 nd fuse element,
A 2 nd electrode portion connected to the 2 nd fuse element on the opposite side of the 1 st fuse element, and
a 3 rd electrode portion connected between the 1 st fuse element and the 2 nd fuse element and connected in series with the heater,
the 1 st fuse elements constituting the plurality of protection elements are connected to the same pole,
is constructed in the following manner: when an overcurrent flows through the 1 st fuse element and the 2 nd fuse element constituting the plurality of protection elements, respectively, or when an overvoltage is applied to a secondary battery connected to a protection circuit, the 1 st fuse element in the protection elements is disconnected before the 2 nd fuse element.
9. The protection circuit of claim 8, wherein the protection circuit,
the 1 st fuse element has a thermal characteristic different from a thermal characteristic of the 2 nd fuse element,
the thermal characteristics of the 1 st fuse element and the thermal characteristics of the 2 nd fuse element include at least one of a thermal resistance and a thermal capacity.
10. The protection circuit according to claim 9, wherein a length of the 1 st fuse element is longer than a length of the 2 nd fuse element, a width-directional sectional area of the 1 st fuse element is smaller than a width-directional sectional area of the 2 nd fuse element, and/or a thermal conductivity of a material forming the 1 st fuse element is larger than a thermal conductivity of a material forming the 2 nd fuse element.
11. The protection circuit according to any one of claims 8 to 10,
the 1 st electrode portion has thermal characteristics different from the thermal characteristics of the 2 nd electrode portion,
the thermal characteristics of the 1 st electrode portion and the thermal characteristics of the 2 nd electrode portion include at least one of a thermal resistance and a thermal capacity.
12. The protection circuit according to claim 11, wherein a thermal conductivity of a material forming the 1 st electrode portion is smaller than a thermal conductivity of a material forming the 1 st electrode portion.
13. The protection circuit according to any one of claims 8 to 12,
each of the plurality of protection elements further includes:
a 1 st conduction part for conducting the 1 st electrode part with an external circuit, and
a 2 nd conduction part for conducting the 2 nd electrode part with an external circuit,
the 1 st conduction part has a thermal characteristic different from a thermal characteristic of the 2 nd conduction part,
the thermal characteristics of the 1 st conductive part and the thermal characteristics of the 2 nd conductive part include at least one of a thermal resistance and a thermal capacity.
14. The protection circuit according to claim 13, wherein a width-directional cross-sectional area of the 1 st via is smaller than a width-directional cross-sectional area of the 2 nd via, and/or a thermal conductivity of a material forming the 1 st via is smaller than a thermal conductivity of a material forming the 2 nd via.
15. The protection circuit according to any one of claims 8 to 14,
further comprises:
a plurality of 1 st connection parts arranged between the plurality of 1 st electrode parts and an external circuit, and
a plurality of 2 nd connecting parts arranged between the plurality of 2 nd electrode parts and an external circuit,
the 1 st connection portion connected to the 1 st fuse element constituting each of the plurality of protection elements has a thermal characteristic different from a thermal characteristic of the 2 nd connection portion connected to the 2 nd fuse element of the protection element,
the thermal characteristics of the 1 st connection portion and the 2 nd connection portion include at least one of a thermal resistance and a thermal capacity.
16. The protection circuit according to claim 15, wherein the length of the 1 st connection part is longer than the length of the 2 nd connection part, and/or the width-directional cross-sectional area of the 1 st connection part is smaller than the width-directional cross-sectional area of the 2 nd connection part.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018-220365 | 2018-11-26 | ||
| JP2018220365 | 2018-11-26 | ||
| PCT/JP2019/045822 WO2020110949A1 (en) | 2018-11-26 | 2019-11-22 | Protection element and protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113169002A true CN113169002A (en) | 2021-07-23 |
Family
ID=70853334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201980076085.2A Pending CN113169002A (en) | 2018-11-26 | 2019-11-22 | Protection element and protection circuit |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JP7444587B2 (en) |
| KR (1) | KR102611131B1 (en) |
| CN (1) | CN113169002A (en) |
| TW (1) | TWI824067B (en) |
| WO (1) | WO2020110949A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7487098B2 (en) | 2020-12-28 | 2024-05-20 | デクセリアルズ株式会社 | Protection elements and electronic devices |
| JP2024001714A (en) * | 2022-06-22 | 2024-01-10 | デクセリアルズ株式会社 | Protection element and method for producing the same |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4095426B2 (en) | 2002-12-12 | 2008-06-04 | ソニーケミカル＆インフォメーションデバイス株式会社 | Secondary battery device |
| JP2007059295A (en) | 2005-08-26 | 2007-03-08 | Uchihashi Estec Co Ltd | Circuit protective element and protection method of circuit |
| JP2010165685A (en) | 2010-03-04 | 2010-07-29 | Sony Chemical & Information Device Corp | Protection element, and battery pack |
| JP6171500B2 (en) | 2013-04-03 | 2017-08-02 | 株式会社村田製作所 | fuse |
| JP6427331B2 (en) | 2014-04-07 | 2018-11-21 | デクセリアルズ株式会社 | Protective element, protective circuit and battery circuit |
| JP6801974B2 (en) | 2016-03-24 | 2020-12-16 | デクセリアルズ株式会社 | Protective element |
-
2019
- 2019-11-21 JP JP2019210841A patent/JP7444587B2/en active Active
- 2019-11-22 WO PCT/JP2019/045822 patent/WO2020110949A1/en active Application Filing
- 2019-11-22 KR KR1020217015012A patent/KR102611131B1/en active IP Right Grant
- 2019-11-22 CN CN201980076085.2A patent/CN113169002A/en active Pending
- 2019-11-26 TW TW108142868A patent/TWI824067B/en active
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020110949A1 (en) | 2020-06-04 |
| TW202038277A (en) | 2020-10-16 |
| KR20210076118A (en) | 2021-06-23 |
| JP7444587B2 (en) | 2024-03-06 |
| TWI824067B (en) | 2023-12-01 |
| JP2020092085A (en) | 2020-06-11 |
| KR102611131B1 (en) | 2023-12-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR102251913B1 (en) | Protective element and battery pack | |
| JP7281274B2 (en) | Protective elements and battery packs | |
| KR101946106B1 (en) | Protective element and battery pack | |
| KR20150040954A (en) | Protective element and battery pack | |
| JP2024009983A (en) | Protection element and battery pack | |
| CN113169002A (en) | Protection element and protection circuit | |
| CN114600328B (en) | Protection circuit, battery pack and working method of protection circuit | |
| WO2021090947A1 (en) | Protection circuit, battery pack, and protection circuit operating method | |
| WO2021210634A1 (en) | Protective element, and battery pack | |
| WO2021015154A1 (en) | Protective element and protective circuit | |
| KR102676890B1 (en) | Protection circuit, battery pack and how the protection circuit works | |
| WO2022196594A1 (en) | Protective element and battery pack | |
| JP7487098B2 (en) | Protection elements and electronic devices |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |