Short-circuit element and a circuit using the same

Patent metadata

Field	Value
Publication number	US-9953793-B2
Application number	US-201514819328-A
Country	US
Kind code	B2
Filing date	Aug 5, 2015
Priority date	Feb 5, 2013
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

A bypass avoiding only abnormal cells or abnormal electronic components in an electronic appliance having a plurality of battery cells or electronic components is formed to decrease resistance while keeping functionality. An insulating substrate 2 ; a heat-generating resistor 3 arranged on the insulating substrate 2 ; a first and a second electrodes 4, 5 arranged adjacently to each other on the insulating substrate 2 ; a third electrode 6 arranged adjacently to the first electrode 4 and electrically connected to the heat-generating resistor; and a first meltable conductor 8 arranged between the first and third electrodes 4, 6 to constitute a current path capable of being blown by a heat generated by the heat-generating resistor 3 are provided. The first meltable conductor 8 melted by heat from the heat-generating resistor 3 gathers on the first and second electrodes 4, 5 to short-circuit them.

First claim

The invention claimed is:

1. A short-circuit element comprising:
an insulating substrate;
a heat-generating resistor arranged on the insulating substrate;
a first and a second electrodes arranged adjacently to each other on the insulating substrate;
a third electrode arranged adjacently to the first electrode on the insulating substrate and electrically connected to the heat-generating resistor; and
a first meltable conductor arranged between the first and third electrodes to constitute a current path capable of being blown by a heat generated by the heat-generating resistor,
wherein the first meltable conductor is melted by the heat from the heat-generating resistor and gathers on the first and second electrodes to short-circuit the first and second electrodes.

2. The short-circuit element according to claim 1 further comprising a second meltable conductor arranged on the second electrode,
wherein the first and second meltable conductors are melted by the heat from the heat-generating resistor and gather on the first and second electrodes to short-circuit the first and second electrodes.

3. The short-circuit element according to claim 2 ,
wherein the second meltable conductor is narrower than the first meltable conductor.

4. The short-circuit element according to claim 2 further comprising an insulating layer laminated on the insulating substrate,
wherein the first to third electrodes are arranged on the insulating layer, and
wherein the heat-generating resistor is disposed within the insulating layer or between the insulating layer and the insulating substrate.

5. The short-circuit element according to claim 2 , wherein the heat-generating resistor is disposed within the insulating substrate.

6. The short-circuit element according to claim 2 , wherein the heat-generating resistor is disposed on a surface of the insulating substrate opposite to an electrode-forming surface.

7. The short-circuit element according to claim 2 , wherein the heat-generating resistor is disposed on an electrode-forming surface of the insulating substrate.

8. The short-circuit element according to claim 2 further comprising:
a second meltable conductor arranged on the second electrode,
wherein the heat-generating resistor overlaps the first meltable conductor and the second meltable conductor, and the overlap area of the second meltable conductor is larger than that of the first meltable conductor.

9. The short-circuit element according to claim 2 , wherein surfaces of the first electrode and the second electrode are coated with one of Ni/Au plating, Ni/Pd plating and Ni/Pd/Au plating.

10. The short-circuit element according to claim 2 further comprising:
a fourth electrode arranged adjacently to the second electrode on the insulating substrate; and
a second meltable conductor arranged between the second and fourth electrodes to constitute a current path capable of being blown by a heat generated by the heat-generating resistor,
wherein the first electrode has an area wider than that of the third electrode, and the second electrode has an area wider than that of the fourth electrode.

11. The short-circuit element according to claim 2 further comprising:
a covering member arranged on the insulating substrate for internal protection; and
a covering member electrode arranged on an inner surface of the covering member,
wherein the covering member electrode is arranged at a position which overlaps the first electrode and the second electrode.

12. The short-circuit element according to claim 2 further comprising a protective resistor arranged on the insulating substrate and connected to one of the first electrode and the second electrode.

13. The short-circuit element according to claim 2 further comprising:
a second meltable conductor arranged on the second electrode,
wherein the first and second meltable conductors are a Pb free solder consisting essentially of Sn.

14. The short-circuit element according to claim 2 further comprising:
a second meltable conductor arranged on the second electrode,
wherein the first and second meltable conductors contain a low melting point metal and a high melting point metal, and
wherein the low melting point metal is melted by a heat generated by the heat-generating resistor and erodes the high melting point metal.

15. The short-circuit element according to claim 14 ,
wherein the low melting point metal is a solder, and
wherein the high melting point metal is Ag, Cu or an alloy consisting essentially of Ag or Cu.

16. The short-circuit element according to claim 14 , wherein the first and second meltable conductors have a coated structure in which the low melting point metal constitutes an inner layer and the high melting point metal constitutes an outer layer.

17. The short-circuit element according to claim 14 , wherein the first and second meltable conductors have a coated structure in which the high melting point metal constitutes an inner layer and the low melting point metal constitutes an outer layer.

18. The short-circuit element according to claim 14 , wherein the first and second meltable conductors have a laminated structure in which the low melting point metal and the high melting point metal are laminated.

19. The short-circuit element according to claim 14 , wherein the first and second meltable conductors have a multi-layered structure having four or more layers in which the low melting point metal and the high melting point metal are alternately laminated.

20. The short-circuit element according to claim 14 , wherein the first and second meltable conductors have a stripe-shaped structure in which the high melting point metal partially overlaps a surface of the low melting point metal.

21. The short-circuit element according to claim 14 , wherein the first and second meltable conductors are constituted of a high melting point metal having a plurality of openings and a low melting point metal inserted in the openings.

22. The short-circuit element according to claim 14 , wherein, in the first and second meltable conductors, the volume of the low melting point metal is larger than that of the high melting point metal.

23. The short-circuit element according to claim 2 ,
wherein a first external connecting electrode continuous with the first electrode on the same surface as the meltable conductor, one or more first external connecting terminals provided on the first external connecting electrode, a second external connecting electrode continuous with the second electrode, and one or more second external connecting terminals provided on the second external connecting electrode are formed on the insulating substrate, and
wherein a combined resistance of the first external connecting terminal and the second external connecting terminal is lower than a conduction resistance between the first and second external connecting electrodes when the first electrode and the second electrode are short-circuited.

24. The short-circuit element according to claim 23 , wherein the external connecting terminal is a metal bump made of a lead-free solder consisting essentially of tin.

25. The short-circuit element according to claim 23 , wherein the external connecting terminal is one of a metal bump and a metal post.

26. The short-circuit element according to claim 25 , wherein, in the metal bump or metal post, a low melting point metal layer is form

Assignees

• Dexerials Corp

Inventors

• Yoneda Yoshihiro

Classifications

• H01M10/482

  for several batteries or cells simultaneously or sequentially · CPC title

• H01M2200/10

  Temperature sensitive devices · CPC title

• H01H2231/026

  Car · CPC title

• H01H61/02

  wherein the thermally-sensitive member is heated indirectly, e.g. resistively, inductively · CPC title

• H01M10/441

  for several batteries or cells simultaneously or sequentially · CPC title