JP2000182596A - Electrothermal relay for battery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electrothermal relay for battery capable of preventing ignition and explosion due to battery temperature rise, enhancing the battery safety and improving usability. SOLUTION: This electrothermal relay for battery is constituted of a normally-closed side fixed contact 5, an operation side fixed contact 6, a contact plate 8 with moving contacts 7, a battery side terminal 3 connected to the normally-closed side fixed contact 5 and a loading side terminal 4 connected to the operation side fixed contact 6, an adjusting screw 9 consisting of a cup 10 and a screw bar 11 that are welded together with a thermally meltable metal 12, a thermosensitive bar 13 for screwing and supporting the adjusting screw 9, an insulating base 1 sealing and fixing the thermosensitive bar 13 and the battery side terminal 3 by penetrating, an insulating cover 2 penetrating through the loading side terminal 4, and elastic body 14 for pressing and holding the contact plate 8 against the cup part of the adjusting screw 9. Thereby when the temperature of a nonaqueous electrolyte secondary battery abnormally rises, ignition and explosion can be prevented by interruption or short circuit discharge.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal relay for a battery, and more particularly to a mobile device such as an electric vehicle or an electric cart.
Non-aqueous electrolyte secondary batteries used as power supplies for portable devices such as video cameras and personal computers, backup devices in the event of a power outage, and security devices, and abnormal heat generation and pressure due to overcharge, reverse charge, external short circuit, etc. The present invention relates to a thermal relay for a battery, which is suitable for preventing ignition, explosion, or the like due to rising or the like.

[0002]

2. Description of the Related Art As a conventional safety protection device for a non-aqueous electrolyte secondary battery, as disclosed in Japanese Patent Laid-Open No. 6-290767, a battery reaction section, a positive or negative pole terminal, and another pole terminal are disclosed. A chemical battery having a battery container that also functions as a battery, and a partition plate that is connected to electrodes and seals the battery container via an insulating material by a driving member that is driven by gas pressure or reaction heat generated at the time of an abnormal reaction of the battery. Cut off the conduction between the children,
A method for short-circuiting between a pole terminal and a battery container is known. Further, as shown in Japanese Patent Publication No. 7-75138, a thermal relay is formed by a plate-shaped bimetal having a movable contact, a fixed contact, and a head and a screw portion connected to each other by a heat-soluble metal. When the temperature rises normally, the current is cut off by the bimetal, and the temperature rises to an abnormally high level, such as welding of contacts, with the adjustment screw and the thermal screw relay that has a coil spring that presses and holds the dish-shaped bimetal on the adjustment screw head. In such a case, a method is known in which the heat-fusible metal is melted and the bimetal is forcibly pushed up by a coil spring to open a contact and cut off current.

[0003]

However, in the example of Japanese Patent Application Laid-Open No. 6-290767, a partition plate serving as an electric passage and serving as a sealing member is crimped to an opening of a battery container with an insulating material interposed therebetween. Container is sealed. Between the inside of the open end of the battery container bent inward and the partition plate,
The structure is such that the pole terminals connected to the outside of the battery are movably installed by gas pressure. Therefore, it is necessary to caulk the partition plate through a soft and thick insulating material such as polypropylene which serves as a packing for preventing leakage of the electrolyte, and not only the position of the partition plate is not stabilized in the vertical direction due to variations in caulking. In addition, the sealing of the battery container is loosened due to temperature change of the soft thick resin with time, and liquid leakage is likely to occur.

In addition, since the distance and parallelism between the opening end of the battery container which is bent inward to become an electrical connection portion and the partition plate vary, contact and separation between the pole terminals cannot be reliably performed. was there. In addition, it is essential that the pole terminal is electrically connected to the outside and the pole terminal is movable, and the opening end of the battery container, which is one of the electrode connection portions, also forms a battery outer shell. However, the structure was not practically suitable for performing a switch function due to deformation or intrusion of dust or the like. In Japanese Patent Publication No. 7-75138,
A protection device for protecting general loads such as electric motors,
As seen from the charging and discharging characteristics unique to the secondary battery, it is not suitable as a structure for protecting a battery that serves as a load, a power source, or plays a dual role. Further, in order to combine the battery and the battery integrally, it is necessary to improve the heat sensing structure and the electrolyte sealing structure.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a protection device for a non-aqueous electrolyte secondary battery, which is integrally attached to the battery and has an abnormal temperature rise. It is an object of the present invention to provide a thermal relay for a battery, which reliably shuts off current supply to the battery.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above objects, the present invention provides a normally closed fixed contact, a contact plate provided with a working fixed contact and a movable contact, a normally closed fixed contact or a working fixed contact. Battery terminal and load terminal connected to the terminal, adjustment screw consisting of a cup and a screw rod connected to each other with a heat-fusible metal, heat-sensitive rod for screwing in the adjustment screw, heat-sensitive rod, and battery-side terminal. Fixed insulating base,
The present invention provides a thermal relay for a battery characterized by having an insulating cover for penetrating and fixing a load-side terminal and an elastic body for pressing and holding a contact plate against a cup portion of an adjusting screw. According to the thermal relay for a battery, the heat-sensitive rod is divided into two with the adjusting screw holding the contact plate (of course, it may be a single rod without being divided), and the heat-fusible metal (for example, In the case of abnormal temperatures, the heat-fusible metal melts at 80-130 ° C to melt the cup part of the adjusting screw, and the elastic body that holds the contact plate The cup and the contact plate are pushed up to move the movable contact from the normally closed fixed contact to the working fixed contact. Therefore, the battery-side circuit connected to the normally closed fixed contact is cut off, and the load-side circuit connected to the operating fixed contact is short-circuited, thereby protecting the battery and the load safely. Further, the heat-sensitive rod and the battery-side terminal were protruded to the outside of the insulating base and hermetically fixed, and the heat-sensitive rod was made of aluminum or copper having good heat conductivity, and was connected to an adjusting screw integrated with the heat-soluble metal. Therefore,
An object of the present invention is to provide a thermal relay for a battery having good sealing properties of an electrolytic solution even when integrally attached to the battery, quickly transmitting the rise in the temperature of the battery to the heat-soluble metal, and having reliable protection characteristics.

That is, the thermal relay for a battery according to the first aspect of the present invention includes a normally closed fixed contact connected to a battery terminal connected to a positive electrode or a negative electrode of the battery, a load-side terminal and an operating fixed contact. Connected normally-closed fixed contact, working-side fixed contact connected to both battery-side terminal and other load-side terminal connected to the other electrode of the battery, and normally-closed fixed contact or working-side fixed A contact plate with a movable contact that contacts the contact, a heat-sensitive rod that conducts heat inside the battery, an insulating base that is hermetically sealed by penetrating the heat-sensitive rod and the battery-side terminal, and an insulating cover that penetrates and fixes the load-side terminal And a cup coupled to the contact plate support of the heat-sensitive bar with a heat-fusible metal, and an elastic body that presses and holds the contact plate against the cup, and the movable contact of the contact plate is normally a normally closed fixed contact. Touches and heats up when set temperature is reached due to temperature rise Metal is melted and the movable contact of the contact plate is to contact the actuating side fixed contact. With such a configuration, the heat transfer performance is improved by improving the heat conduction of the heat-sensitive rod, and the current interruption can be easily prevented by preventing the occurrence of an arc against the abnormal temperature rise of the battery. The use of the entire battery can be continued. In addition, the thermal relay for a battery according to the second aspect of the present invention contacts the normally-closed fixed contact and the normally-closed fixed contact respectively connected to the battery-side terminal and the load-side terminal connected to the positive or negative electrode of the battery. A contact plate with a movable contact that conducts heat, a heat-sensitive rod that conducts heat inside the battery, an insulating base that is hermetically sealed by penetrating the heat-sensitive rod and the battery-side terminal, an insulating cover that penetrates and fixes the load-side terminal, A cup connected to the contact plate support portion of the rod with a heat-fusible metal, and an elastic body that presses and holds the contact plate against the cup is provided, and the movable contact of the contact plate normally contacts the normally closed fixed contact, When the set temperature is reached due to the temperature rise, the heat-fusible metal is melted, and the movable contact of the contact plate is separated from the normally closed fixed contact. With such a configuration, with a simple structure, current interruption can be performed in response to abnormal temperature rise of the battery, and a low-cost relay can be supplied for a small load. The thermal relay for a battery according to the third aspect of the present invention includes a positive and negative working-side fixed contact connected to both a battery-side terminal and a load-side terminal connected to the positive or negative electrode of the battery; A contact plate with a movable contact provided to be able to contact the fixed contact, a heat-sensitive rod that conducts heat inside the battery, an insulating base tightly sealed through the heat-sensitive rod and the battery-side terminal, and a load-side terminal Equipped with an insulating cover that penetrates and fixes, a cup that is connected to the contact plate support of the heat-sensitive bar with a heat-soluble metal, and an elastic body that presses and holds the contact plate against the cup, usually the movable contact of the contact plate is free In this state, when the temperature reaches the set temperature due to the temperature rise, the heat-fusible metal melts, and the movable contact of the contact plate comes into contact with the working-side fixed contact. With such a configuration, the thermal performance can be improved, and the electric energy of the battery can be safely consumed by self-discharge. Further, the thermal relay for a battery according to the fourth aspect of the present invention includes the thermal rod,
The adjusting screw is screwed and supported by the threaded rod portion, and is connected to the cup with a heat fusible metal at the contact plate supporting portion of the adjusting screw. With such a configuration, the contact plate supporting portion can be easily assembled. According to a fifth aspect of the present invention, in the thermal relay for a battery, the heat-sensitive rod is directly connected to a cup of the contact plate supporting portion with a heat-soluble metal. With such a configuration, the thermal conductivity of the heat-sensitive bar is improved, and early current interruption for abnormal temperature rise is enabled. According to a sixth aspect of the present invention, there is provided a thermal relay for a battery, wherein the temperature at which the heat-fusible metal of the cup melts due to a rise in temperature is set to 80 to 130 ° C. With such a configuration, the battery can be operated before the operating temperature of the battery (usually at most 60 ° C.) is exceeded and the internal insulating film such as the separator is melted, thereby preventing an accident. According to a seventh aspect of the present invention, in the thermal relay for a battery according to the present invention, the heat-sensitive rod and the battery-side terminal protrude outside from the insulating base and penetrate therethrough, and the heat-sensitive rod and the battery-side terminal are hermetically fixed to the insulating base by insert molding. Things. Such a configuration enables reliable fabrication without deviation and assembly of the battery without leakage of the electrolyte. The non-aqueous electrolyte secondary battery according to the invention of claim 8 is characterized in that the material of the heat-sensitive rod used in the thermal relay for a battery according to any one of claims 1 to 7 is made of aluminum or copper. is there. According to such a configuration, since aluminum and copper can sufficiently withstand the electrolytic solution and are general metals having good heat conductivity, a highly accurate heat-sensitive rod having excellent durability can be supplied at low cost.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a structural sectional view showing a first embodiment of a thermal relay for a battery according to the present invention, and FIG. 2 is a sectional view taken along line AA of FIG. FIG. 7 is an electric circuit diagram showing an example of use of FIG. In the electric circuit diagram, 2
Reference numeral 4 denotes a non-aqueous electrolyte secondary battery, and reference numeral 25 denotes a load operated using the battery as a power source.

In these figures, reference numeral 1 denotes an insulating base, which forms an outer shell of a thermal relay for a battery,
Since it is integrally attached to the battery as a sealing plate of the case of the non-aqueous electrolyte secondary battery, it can withstand the electrolyte used for the non-aqueous electrolyte secondary battery and has good heat resistance, such as polyphenylene sulfide (PPS) or the like. Phenolic resins are suitable. 2
Denotes an insulating cover, which is combined with the insulating base 1 to form a case for accommodating the switch portion of the thermal relay for a battery.
Reference numeral 3 denotes a battery-side terminal, and 13 denotes a heat-sensitive stick, which penetrates the insulating base 1 and protrudes outward, and is hermetically fixed to the insulating base 1 by insert molding or the like.

For example, in the case of a lithium ion secondary battery,
The battery terminal 3 and the heat-sensitive rod 13 serve as a charged portion in the battery. To prevent an electrochemical reaction, it is necessary to use aluminum when connected to the positive electrode and copper material when connected to the negative electrode. Aluminum and copper materials are metals having good heat conductivity, and are suitable materials for the heat-sensitive rod 13 for transmitting heat. Reference numeral 4 denotes a load-side terminal, which is mounted so as to protrude outward from the insulating cover 2. Reference numeral 5 denotes a normally closed fixed contact. One is connected to the positive or negative electrode of the battery, and the other is connected to the load terminal 4 and the working fixed contact 6.

The other working-side fixed contact 6 has:
The battery terminal 3 and the load terminal 4 of the other electrode are connected. Reference numeral 7 denotes a movable contact, which is fixed to both ends of the contact plate 8 and disposed between the normally closed fixed contact 5 and the working fixed contact 6. Reference numeral 9 denotes an adjusting screw, which comprises a pan-shaped cup 10 and a threaded threaded rod 11, and is connected to each other by a heat-fusible metal 12. The heat fusible metal 12 is a low melting point alloy such as solder. For use in a non-aqueous electrolyte secondary battery, the temperature is 80 to 130 ° C. due to the relationship between the practical use temperature and the temperature at which thermal runaway of the battery electrode is prevented. A low melting point alloy with a melting point of 2 can safely protect the battery.

The adjusting screw 9 is screwed and supported on the heat-sensitive bar 13 by the screw rod portion 11, and the contact plate 8 is pressed and held against the cup portion 10 by an elastic body 14 such as a coil spring. It is in contact with the fixed contact 5 on the closed side. Movable contact 7
The contact pressure on the normally closed side fixed contact 5 is adjusted by the amount of screwing of the adjusting screw 9 by the spring pressure of the bending deformation of the contact plate 8. The elastic body 14 pushes up the contact plate 8 when the heat-fusible metal 12 is melted due to a rise in temperature and the connection between the cup 10 and the screw rod 11 is released, and the movable contact 7 comes into contact with the working-side fixed contact 6. It shall have sufficient free length and pushing pressure. Note that the two-dot chain line in the figure shows a state in which the contact plate 8, the movable contact 7, and the cup 10 are operated.

FIG. 3 shows a second embodiment of the thermal relay for a battery according to the present invention.
FIG. 2 is a cross-sectional view showing the embodiment. FIG. 8 is an electric circuit diagram showing an example of use of FIG. This second embodiment is
The difference from the first embodiment shown in FIGS. 1 and 2 is that there is no movable fixed contact. That is, one normally closed fixed contact 5 is connected to the battery terminal 3 connected to the positive or negative electrode of the battery, and the other normally closed fixed contact 5 is connected to the load terminal 4. The other electrode of the battery is connected to the other battery terminal 3 and is directly connected to the other load terminal 4. Normally, the movable contact 7 is in contact with the normally closed fixed contact, and when the heat fusible metal 12 melts due to a temperature rise, the elastic body 14 pushes up the contact plate 8, and the movable contact 7 is moved from the normally closed fixed contact 5. Separate and disconnect the battery from the load.

FIG. 4 shows a third embodiment of the thermal relay for a battery according to the present invention.
FIG. 2 is a cross-sectional view showing the embodiment. FIG. 9 is an electric circuit diagram showing an example of use of FIG. This third embodiment is
The difference from the first embodiment shown in FIGS. 1 and 2 is that there is no normally closed fixed contact, and the working fixed contact 6 to which both the battery terminal 3 and the load terminal 4 are connected is a positive electrode. And a negative electrode side. Normally, the movable contact 7 is in a free state without contacting anywhere, and the load terminals 4 are directly connected to the positive and negative electrodes of the battery, respectively.
Is melted, the elastic body 14 pushes up the contact plate 8, the movable contact 7 comes into contact with the fixed contact 6 on the operation side, and short-circuits between the positive electrode and the negative electrode of the battery, thereby making the voltage output of the load terminal zero.

FIG. 5 shows a fourth embodiment of the thermal relay for a battery according to the present invention.
FIG. 2 is a cross-sectional view showing the embodiment. The fourth embodiment is different from the first embodiment shown in FIGS. 1 and 2 in that the screw rod 11 is formed separately from the heat-sensitive rod 13 in the first embodiment. On the other hand, in the fourth embodiment, these are integrated into a single rod while they are supported by being screwed. Thus, the heat-sensitive stick 1
By integrating 3 as one rod, heat conduction performance is improved.

FIG. 6 is a sectional view showing an example in which the thermal relay for a battery of the present invention is mounted on a non-aqueous electrolyte secondary battery. Reference numeral 21 denotes a battery case, in which a power generation element 22 in which an electrode group in which a positive electrode and a negative electrode are wound with a separator interposed therebetween is impregnated with an electrolyte is accommodated. The positive electrode and the negative electrode of the power generation element 22 are connected to the battery-side terminal 3 of the battery thermal relay 20.
, And the tip of the heat-sensitive bar 13 is disposed inside or near the power generating element 22. The battery thermal relay 20 is mounted in a manner such that the opening of the battery case 21 is closed with the insulating base 1, and the battery case 21 is hermetically sealed by caulking via a gasket 23.

Here, the operation of the thermal relay for a battery according to the present invention will be described. When the non-aqueous electric liquid secondary battery is overcharged to a voltage equal to or higher than the set voltage due to a failure in the charging circuit, a chemical reaction other than the charging reaction is performed to decompose the electrolyte, thereby deteriorating the battery and increasing the temperature of the battery. In addition, when overcharging progresses or is rapidly charged, ionized metal precipitates as a metal on the negative electrode due to the dentite reaction, breaks through the insulating separator between the electrodes, causing a short circuit between the positive and negative electrodes, causing a short-circuit current to flow and abnormal temperature become. Also, use at high temperature beyond the normal battery operating temperature range, external short circuit due to misuse, internal short circuit inside the battery for some reason,
The battery generates heat and reaches an abnormal temperature. When the battery temperature rises, a microporous polyethylene or polypropylene film serving as a separator between the positive electrode and the negative electrode
It melts at 0 ° C. and acts to shut off the current by a shutdown effect that stops the transfer of ions between the positive and negative electrodes by closing the microporous film.

However, the polyethylene or polypropylene film, which is the material of the separator, may melt and shrink due to a further increase in temperature, resulting in a short circuit between the electrodes without securing insulation between the positive and negative electrodes. If the temperature inside the battery exceeds 150 ° C., the active material used for the electrodes will cause thermal runaway, resulting in a dangerous temperature range where smoke, ignition, and explosion occur. Therefore, the upper limit of the melting temperature of the heat-soluble metal is
130 ° C is desirable from the temperature that does not reach the melting temperature of the separator and the thermal runaway temperature of the electrode. The lower limit temperature is that it does not operate at the upper limit temperature of 60 ° C, which is the practical temperature range of the battery, and prevents malfunction due to the creep characteristics of the heat-soluble metal. 80 ° C.

Next, the operation of the first embodiment will be described first. When the temperature of the battery rises abnormally for some reason, heat is transmitted to the adjusting screw 9 through the heat-sensitive rod 13 of the thermal relay for battery integrated with the battery. The low melting point heat-fusible metal 12 connecting the cup 10 of the adjusting screw 9 and the screw rod 11 is melted at 80 to 130 ° C.
When the connection between the screw and the screw rod 11 is released, the elastic body 14 that has stored the force pushes up the contact plate 8 and the cup 10 along the mandrel of the screw rod 11 and moves the movable contact 7 from the normally closed fixed contact 5. The release-side fixed contact 6 is brought into contact. Therefore, the output of the battery connected to the battery side terminal is cut off and the load side terminals 4 are short-circuited, so that both the battery and the load can be safely protected.

Further, after the heat fusible metal 12 is melted and the contact plate 8 is moved by the force of the elastic body 14, the movable contact 7 does not return to its original state, so that the safety is reliably maintained.
Also, even when using multiple batteries connected in series,
Only one abnormal battery is cut off by disconnection between the battery terminals, and a series circuit of normal batteries remaining due to the short circuit between the load terminals is formed, so that the load can be operated continuously. Also, when n E-volt batteries are connected in series, when the movable contact 7 leaves the normally closed fixed contact 5, a DC voltage of n × E volts is applied between the normally closed fixed contacts, and a DC current arc is applied. However, since the movable contact 5 short-circuits between the fixed contacts 6 on the working side, only the E volt of one battery is applied between the fixed contacts on the normally closed side. it can.

Next, the operation of the second embodiment will be described. This is the same as the operation described in the operation of the first embodiment, except that the normally closed fixed contact 5 is shut off when the abnormal temperature rises. In other words, when the battery is abnormal, the battery circuit is shut off, and the battery is safely protected before firing or explosion.

Next, the operation of the third embodiment will be described. Normally, the load is connected to the battery terminal 3 directly connected to the battery terminal 3 connected to the secondary battery, so that there is no contact portion in the middle of the load, and the load including the battery thermal relay 20 is not provided. The battery-side internal resistance between the side terminals 4 can be reduced. Therefore, the load characteristics of the battery when the battery is used are good, and the power loss is small, so that the heat generation of the battery case can be suppressed. When the abnormal temperature rises, the working fixed contact 6 connected to the positive and negative electrodes of the battery is short-circuited, so that the electric energy stored in the abnormal battery is discharged through the working fixed contact. Therefore, the abnormal battery can be killed in a safe state. As a result of the battery combustion test, it was confirmed that the charged battery exploded, but the discharged battery did not explode at all. Also, even when a plurality of batteries are connected in series, only the abnormal battery is cut off because the terminals on the load side are short-circuited, and a series circuit of only the remaining normal batteries is formed, so that power can be continuously supplied to the load. This is the same as the first embodiment. In addition, since the structure is such that there is no break between the contacts through which a DC current is flowing, there is no fear that a DC arc is generated.

Next, the operation of the fourth embodiment will be described. This is different from the first embodiment in that the heat-sensitive bar is formed as a two-piece type in which the adjusting screw is screwed in, whereas the heat-sensitive bar is formed as an integral part in the fourth embodiment. . Therefore, since the heat-sensitive rod is directly connected to the heat-soluble metal, the heat conductivity can be improved, and early response to abnormal heat generation becomes possible. It should be noted that the integration of the heat-sensitive bar as one bar is performed in the second and third bars.
Can be applied to the embodiment.

Further, as a common feature of the embodiments of the present invention, the heat-sensitive rod 13 and the battery terminal 3 are penetrated through the insulating base 1 and are protruded to the outside and are hermetically fixed by plastic insert molding, so that the electrolyte leaks. There is no need to worry, it can be attached integrally with the battery as a battery sealing plate, and the heat of the power generating element 22, which is the heat generating portion in the battery, is effectively transmitted to the heat fusible metal 12 by the heat-sensitive rod 13, and the switch is reliably operated. Is performed. Also, since the material of the heat-sensitive rod 13 is a metal material of aluminum or copper having good thermal conductivity, an abnormal temperature in the battery can be quickly transmitted, and a thermodynamic relay for a battery having good temperature response can be obtained. The liquid secondary battery can be protected safely.

[0025]

As described above, the thermal relay for a battery according to the present invention is provided with a battery-side terminal and a load-side terminal, and connects a circuit in which each terminal is combined with a normally-closed fixed contact and an operating-side fixed contact. Then, the circuit is switched by a contact plate having a movable contact, the battery circuit is cut off, and the short circuit between the load terminals causes
Batteries and loads can be safely protected before firing or explosion. Further, by performing a switch operation by melting a heat-fusible metal that melts at 80 to 130 ° C., it has protection characteristics suitable for battery characteristics, and since it is non-recoverable, safety is reliably maintained. . In addition, since a metal heat-sensitive rod having good heat conductivity is provided, heat in the battery case is transmitted to the heat-soluble metal with good responsiveness, and the switch operation is reliably performed. In addition, since the heat-sensitive rod and the battery side terminal penetrate the insulating base and protrude outward and are hermetically sealed by plastic insert molding, even if they are integrally attached to the battery as a sealing plate that forms the outer shell of the battery, leakage of the electrolyte can occur. A highly reliable battery structure can be obtained.

[Brief description of the drawings]

FIG. 1 is a structural sectional view showing a first embodiment of a thermal relay for a battery according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a structural sectional view showing a second embodiment of the thermal relay for a battery according to the present invention.

FIG. 4 is a structural sectional view showing a third embodiment of the thermal relay for a battery according to the present invention.

FIG. 5 is a structural sectional view showing a fourth embodiment of the thermal relay for a battery according to the present invention.

FIG. 6 is a structural sectional view showing an example in which the thermal relay for a battery of the present invention is attached to a non-aqueous electrolyte secondary battery.

FIG. 7 is an electric circuit diagram showing a usage example of the thermal relay for a battery in FIG. 1;

FIG. 8 is an electric circuit diagram showing an example of using the thermal relay for a battery of FIG. 3;

FIG. 9 is an electric circuit diagram showing an example of use of the thermal relay for a battery of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulation base 2 Insulation cover 3 Battery side terminal 4 Load side terminal 5 Normally closed side fixed contact 6 Working side fixed contact 7 Movable contact 8 Contact plate 9 Adjusting screw 10 Cup 11 Screw rod 12 Heat fusible metal 13 Heat sensitive rod 13a Contact plate Attachment part 14 Elastic body 20 Battery thermal relay 21 Battery case 22 Power generation element 23 Gasket 24 Non-aqueous electrolyte secondary battery 25 Load

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Katsuyuki Matsuki 800, Tomita, Ohira-machi, Ohira-machi, Shimotsuga-gun, Tochigi Prefecture Inside the Cooling and Refrigerating Business Dept., Hitachi, Ltd. Ground Yamada Electric Manufacturing Co., Ltd. (72) Inventor Kazuo Ito 5-45-5 Kamiida Minamicho, Kita-ku, Nagoya-shi, Aichi F-term (reference) 5G502 AA02 AA15 BB19 BE10 FF02 FF08 5H022 AA09 CC02 CC08 CC12 EE01 EE04 5H029 AJ12 AL12 BJ27 DJ03 DJ05 EJ01 HJ14

Claims (8)

[Claims] 1. A normally closed fixed contact connected to a battery terminal connected to a positive or negative electrode of a battery; a normally closed fixed contact connected to a load terminal and an operating fixed contact; A working-side fixed contact connected to both of the battery-side terminal and the other load-side terminal connected to the electrodes of the above, a contact plate having a movable contact that contacts the normally-closed-side fixed contact or the working-side fixed contact, A heat-sensitive rod that conducts heat inside the battery, an insulating base tightly sealed by penetrating the heat-sensitive rod and battery-side terminals, an insulating cover that penetrates and fixes the load-side terminals, and heat-fusible to the contact plate support of the heat-sensitive rod Equipped with a cup joined by metal and an elastic body that presses and holds the contact plate against the cup. Normally, the movable contact of the contact plate comes into contact with the normally closed fixed contact, and when the temperature reaches the set temperature due to temperature rise, heat is applied. The molten metal melts, and the movable contact on the contact plate is Thermal relay for battery contacting 2. A normally-closed fixed contact connected to a battery-side terminal and a load-side terminal connected to a positive electrode or a negative electrode of a battery, and a contact plate having a movable contact that contacts the normally-closed fixed contact, A heat-sensitive rod that conducts heat inside the battery, an insulating base tightly sealed by penetrating the heat-sensitive rod and battery-side terminals, an insulating cover that penetrates and fixes the load-side terminals, and heat-fusible to the contact plate support of the heat-sensitive rod Equipped with a cup joined by metal and an elastic body that presses and holds the contact plate against the cup. Normally, the movable contact of the contact plate comes into contact with the normally closed fixed contact, and when the temperature reaches the set temperature due to temperature rise, heat is applied. A thermal relay for batteries in which the molten metal melts and the movable contact on the contact plate separates from the normally closed fixed contact. 3. A positive / negative working-side fixed contact connected to both a battery-side terminal and a load-side terminal connected to the positive or negative electrode of the battery, and a movable contact provided to be able to contact the working-side fixed contact. A contact plate with contacts, a heat-sensitive rod that conducts heat inside the battery, an insulating base that is hermetically sealed by penetrating the heat-sensitive rod and the battery side terminal, an insulating cover that penetrates and fixes the load-side terminal, Equipped with a cup connected to the contact plate support with a heat-fusible metal, and an elastic body that presses and holds the contact plate against the cup.Normally, the movable contact of the contact plate is in a free state. When reached, the heat-soluble metal melts and the movable contact of the contact plate comes into contact with the fixed contact on the working side. 4. An adjusting screw is screwed and supported on the heat-sensitive rod by a screw rod portion, and is connected to the cup by a heat-fusible metal at a contact plate supporting portion of the adjusting screw. 4. The thermal relay for a battery according to 3. 5. The thermal relay according to claim 1, wherein the heat-sensitive rod is directly connected to a cup of the contact plate supporting portion with a heat-soluble metal. 6. The temperature at which the heat-fusible metal of the cup melts due to a rise in temperature is 80 to 130 ° C.
Or a thermal relay for a battery according to item 3. 7. The heat-sensitive rod and the battery-side terminal protrude outside from the insulating base and penetrate through the insulating base, and the heat-sensitive rod and the battery-side terminal are hermetically fixed to the insulating base by insert molding. Thermal relay for batteries. 8. A non-aqueous electrolyte secondary battery in which the material of the heat-sensitive rod used in the thermal relay for a battery according to any one of claims 1 to 7 is aluminum or copper.