WO2014117711A1

WO2014117711A1 - Breaker for actively cutting off circuit

Info

Publication number: WO2014117711A1
Application number: PCT/CN2014/071558
Authority: WO
Inventors: 朱维璞; 徐忠厚; 洪尧祥; 许由生
Original assignee: 厦门赛尔特电子有限公司
Priority date: 2013-01-29
Filing date: 2014-01-27
Publication date: 2014-08-07
Also published as: CN103199502B; CN103199502A

Abstract

A breaker for actively cutting off a circuit, in particular a breaker used in a lithium battery power supply, the breaker comprising a housing (400), a temperature sensing mechanism (100), a heat generation mechanism (200) and a bridge contact mechanism (300); the temperature sensing mechanism (100) comprises a temperature sensing body (102);the heat generation mechanism (200) comprises a heat generation component; and the bridge contact mechanism (300) comprises a bridge movable reed (305), at least one bridge static reed (307, 313), an insulation bracket (303) and a first resilient piece (314). The temperature sensing body (102), as a support component of one end of the insulation bracket (303), is controlled by the heat generation component; the bridge movable reed (305) is installed on the insulation bracket (303), one surface thereof directed towards the other end of the insulation bracket (303) forms a contact with the bridge static reeds (307, 313). The bridge movable reed (305), the bridge static reeds (307, 313) and the lithium battery or lithium battery assembly form a lithium battery primary loop in series; the first resilient piece (314) is pressed upward between the other end of the insulation bracket (303) and the inner wall of the housing (400). The breaker coordinated with the battery management system cuts the lithium battery primary loop when over-voltage, over-charge or over-discharge occur with the lithium battery, and eliminates potential hazards such as fire or explosion of the lithium battery under abnormal conditions.

Description

Circuit breaker for actively cutting off circuit

Technical field

The present invention relates to a circuit breaker for cutting off a circuit, and more particularly to a circuit breaker for cutting a power lithium battery to protect a lithium battery when the lithium battery is overcharged or overdischarged.

Background technique

Lithium-ion batteries have high energy density, high average output voltage, and low self-discharge. A good lithium battery, less than 2% per month (recoverable), has no memory effect. The operating temperature range is -20 ° C ~ 60 ° C. Lithium batteries are known as green batteries because of their excellent cycle performance, fast charge and discharge (charging efficiency up to 100%), high output power, light weight, long service life, and no toxic and harmful substances. In recent years, with the development of lithium battery technology, power lithium batteries for various uses have also developed.

In recent years, electric bicycles, hybrid vehicles, electric vehicles, and fuel cell vehicles powered by lithium batteries have received more and more attention from the market. The application of power batteries in the transportation field is of great significance for reducing greenhouse gas emissions, reducing air pollution and the application of new energy sources. In general, the voltage requirements for pure electric vehicles are generally 100. Above V, in order to achieve this working voltage, it is necessary to string together dozens or even hundreds of single cells, and the discharge current of these power battery packs is several tens of ampere or more, and some even reach several hundred amperes.

Due to the abnormal heating, overcharge, over discharge current, vibration, extrusion and other conditions, the lithium battery may cause the battery life to be shortened and damage, and even fire, explosion and other events may occur. Therefore, the safety problem becomes the main application of the power lithium battery application. Constraints. Lithium-ion battery over-charge and discharge will cause permanent damage to the positive and negative electrodes: excessive discharge will cause the negative carbon sheet structure to collapse, and collapse will cause lithium ions to be inserted during charging; over-charge will cause excessive lithium ions to be embedded in the negative carbon The structure causes some of the lithium ions to be released again.

Safe, low-cost, long-life lithium-ion battery safety standards, safety evaluation methods, safety and reliability control of battery manufacturing processes, and optimization of battery safety and reliability through positive and negative materials, electrolytes and diaphragms to ensure large power The key to safe, reliable and practical lithium-ion batteries. The battery management system (BMS), as the core component of battery protection and management, not only ensures the safe and reliable use of lithium batteries, but also fully utilizes the capabilities and extended life of lithium batteries, as a lithium battery and vehicle management system and driving. The bridge of communication, battery management system plays an increasingly important role in the performance of electric vehicles.

External factors of lithium batteries, such as lithium battery charging, including charging mode, charging current, charging end voltage; discharge of lithium battery, including discharge current, depth of discharge, pulse current of lithium battery; change of temperature of lithium battery, etc. External factors can affect the life of the lithium battery. From the use of electric vehicles, it is found that the life of a single lithium battery is much longer than that of an electric battery in an electric vehicle. Research shows that this is because the single lithium battery is in an unbalanced state, and the charging and discharging process is not balanced. The repeated charging and discharging process further exacerbates the imbalance of the single lithium battery, causing the life of the single battery to be shortened, resulting in a shortened life of the battery pack in which it is located, thereby shortening the life of the entire battery system. By means of the battery management system (BMS), judging the state of the single battery and the battery pack, the external parameters of the battery can be optimized, and the life of the lithium battery is finally extended, thereby protecting the lithium battery.

The battery management system BMS will monitor and judge the working status of the power battery pack in real time. When an abnormality is found, the BMS will issue a command to stop the battery pack, and cut off the battery pack by the currently used execution components such as contactors, thyristors, etc. Circuit to protect the battery pack from damage. However, the method of cutting off the circuit is not completely cut off from the electric type. In addition, the contactor has a large volume, and the automatic returning position is easy to occur in the case where the failure factor is not eliminated, and the switching of the thyristor needs to be maintained by the trigger current. It is easy to cause security risks to reappear.

Summary of the invention

The object of the present invention is to overcome the deficiencies of the prior art and provide a circuit breaker for cutting off a power lithium battery, which can be used in conjunction with a battery management system (BMS) when the charging voltage of the lithium battery is too high or excessively discharged. Immediately cut off the main circuit of the power lithium battery, thereby eliminating the hidden danger of the lithium battery in the abnormal situation of fire or explosion.

The technical solution adopted by the present invention to solve the technical problem thereof is: a circuit breaker for cutting off a power lithium battery, comprising a casing and a temperature sensing mechanism, a heat generating mechanism and a bridge contact mechanism installed in the casing; the temperature sensing mechanism The utility model comprises a temperature sensitive body which is automatically melted by heat, the heat generating mechanism comprises a heat generating component, and the bridge contact mechanism comprises a bridge type moving spring piece, at least one bridge type static spring piece, an insulating bracket and a first elastic piece; the temperature sensing body is used as an insulating bracket. The first end support member is mounted on the heat generating component; the bridge movable spring is mounted on the insulating bracket, the bridge static spring is fixedly mounted in the housing, and the bridge movable spring corresponds to the side facing the second end of the insulating bracket and the bridge Forming a contact contact between the static reeds, the bridge moving reed is connected with the bridge static reed and the lithium battery or the lithium battery to form a main circuit of the lithium battery; the first elastic member is disposed at the second end of the insulating bracket and the shell Between the inner walls of the body.

In a preferred embodiment, the bridge contact mechanism further includes a remote signal moving reed and two remote signal pins, and the remote signal reed is mounted on the temperature sensing mechanism and the bridge spring reed. The two remote signal pins are fixedly mounted in the housing, and the two remote signal pins are respectively located at two ends of the remote signal moving reed, and the two ends of the remote signal reed correspond to the back direction One side of the bridge type spring reed is respectively provided with a first convex hull, and one end of each of the two remote letter pins is respectively provided with a first convex hull facing the first convex hull of the remote signal reed Forming a second convex hull of the contact contact, and the other ends of the two remote signal pins are respectively led out of the casing to form a disconnection signal output end of the main circuit of the lithium battery; the second elastic member is disposed on the remote signal moving reed and Between the bridge type moving springs, one of the functions is: for eliminating the pressure deviation of the bridge type moving spring piece and the bridge type static spring piece caused by the dimensional error of the ejector pin; the second function is: when the heat generating component is The temperature sensing body is heated to cause the temperature sensing body to change from a solid state to a liquid state. In the initial stage of the process, the second elastic member is stabilized. The contact state of the movable spring and the bridge static spring, when the depth is liquefied, the elasticity of the first elastic member is greater than the supporting force of the second elastic member, and the insulating bracket, the bridge movable spring, the second elastic member, and the second elastic member are quickly pushed. The overall movement of the remote signal moving reed, disconnecting the bridge moving spring and the bridge static reed, constitutes the disconnection of the main circuit.

In a preferred embodiment, the heat generating component is a heat generating coil, and the heat generating mechanism further includes a first pin, a second pin, and a heat generating mechanism static spring piece, and the second pin abuts against the insulating bracket One end; each end of the first pin and the heat generating mechanism static reed is electrically connected to both ends of the heating coil, and one end of the second pin corresponds to one side facing away from the insulating bracket and the other part of the heat generating mechanism One end forms a contact contact, and the other ends of the first pin and the second pin are respectively led out of the casing to constitute an external line access terminal.

In a preferred embodiment, the temperature sensing mechanism further includes a copper cap and a ejector rod disposed in a cup shape, and the copper cap is in an inverted state and wrapped in the heat generating component, and the ejector rod is disposed under the copper cap. At the opening, the temperature sensing body is placed between the inner bottom wall of the copper cap and the inner end of the jack, and the outer end of the jack abuts against one end of the insulating bracket.

As a preferred embodiment, the second end of the insulating bracket extends with a rod that protrudes outside the casing to form a state indicating rod.

As a preferred embodiment, the bridge static springs are two, and the two bridge static springs are respectively located at two ends of the bridge movable spring, and each end of the two bridge static springs Contacting the two ends of the bridge spring reed corresponding to the second end of the insulating bracket to form a contact contact, and the other ends of the two bridge type static springs are respectively led out of the casing to form a lithium battery main The two electrical connections of the circuit.

As a preferred embodiment, the housing includes an insulating housing having an upper opening and a cover plate, and the cover plate is mounted at an upper opening of the insulating housing, and the two are enclosed for mounting the temperature sensing mechanism, the heat generating mechanism, and a cavity of the bridge contact mechanism; a track structure between the insulating bracket and the insulating casing for freely sliding the insulating bracket in the casing.

In a preferred embodiment, the temperature sensing body is an organic temperature sensing body or a low melting point alloy type temperature sensing body.

As a preferred embodiment, the first elastic member is a compression spring.

As a preferred embodiment, the second elastic member is a compression spring.

A circuit breaker for cutting a power lithium battery of the present invention uses a temperature sensing body as a supporting component. When the battery management system (BMS) issues an instruction to cut off the main circuit of the lithium battery, the power supply of the heat generating mechanism of the present invention is turned on. The heating element is heated by the heating coil of the heating mechanism; when the temperature reaches the melting temperature of the temperature sensing body, the temperature sensing body changes from a solid state to a liquid state, so that the ejector rod forms an active state and loses a limit effect on one end of the insulating bracket. Then, the insulating bracket drives the bridge movable spring to move away from the bridge static spring under the restoring force of the first elastic member, so that the bridge movable spring and the bridge static spring are disconnected, thereby cutting off the lithium battery main The circuit achieves the protection function of the lithium battery.

After the remote signal moving reed, the first remote signal pin, the second remote signal pin and the second elastic member are arranged, the movement of the insulating bracket also drives the remote signal moving reed along the moving spring reed away from the bridge. The directional movement finally brings the two first convex hulls of the remote signal moving reed into contact with the second convex hulls of the two remote signal pins, thereby outputting a signal that the main circuit of the battery is disconnected.

After the heat generating mechanism of the present invention is provided with the first pin, the second pin and the heat spring reed, the movement of the insulating bracket also drives the second pin to move away from the bridge moving spring, and finally the second The pin is disconnected from the static reed of the heating mechanism, thereby cutting off the heating circuit of the heating coil and preventing the heating circuit from continuously energizing.

After the second end of the insulating bracket is extended to a rod body, the movement of the insulating bracket also drives the rod body to move to the inner side of the casing as a visual state indication.

The invention has the beneficial effects that the circuit breaker composed of the temperature sensing mechanism, the heat generating mechanism and the bridge contact mechanism cooperates with the battery management system (BMS), and can be used when the lithium battery is over-voltage, over-charged or over-discharged. The main circuit of the lithium battery is cut off, thereby eliminating the risk of fire or explosion of the lithium battery under abnormal conditions. Compared with the prior art, the invention has the characteristics of quick action, small volume, convenient installation and use. In addition, the invention can also output the active remote signal while cutting off the main circuit of the lithium battery, and has the function of visual state indication, and the function of cutting off the heating circuit while operating, and avoiding the danger of continuous energization of the heating circuit.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, a circuit breaker for cutting a power lithium battery of the present invention is not limited to the embodiment.

DRAWINGS

Figure 1 is a schematic perspective view of the present invention (including a partial cross-sectional view);

Figure 2 is a perspective view of a temperature sensing mechanism of the present invention (including a partial cross-sectional view);

Figure 3 is a perspective view showing the structure of the heat generating mechanism of the present invention;

Figure 4 is a perspective view of the bridge contact mechanism of the present invention (including partial cross-sectional view);

Figure 5 is a schematic cross-sectional view of the present invention before the action;

Figure 6 is a schematic cross-sectional view of the present invention after operation.

detailed description

For example, as shown in FIG. 1 to FIG. 5, a circuit breaker for cutting a power lithium battery includes a housing 400, a temperature sensing mechanism 100, a heat generating mechanism 200, and a bridge contact mechanism 300. The housing 400 includes an insulative housing 402 having an upper opening and a cover plate 401 made of a metal material. The cover plate 401 is mounted on the upper opening of the insulative housing 402, and the two are enclosed for mounting the temperature sensing mechanism 100 and the heating mechanism. 200 and a closed cavity of the bridge contact mechanism 300.

As shown in FIG. 2, the temperature sensing mechanism 100 includes a temperature sensing body 102 that is automatically melted by heat. As a preferred embodiment, the temperature sensing mechanism 100 further includes a copper cap 101 and a top rod 103 that are disposed in a cup shape; here, the temperature sensing body The material 102 may be an organic material or a low melting point alloy material, that is, the temperature sensing body 102 may be an organic temperature sensing body or a low melting point alloy type temperature sensing body.

As shown in FIG. 3, the heat generating mechanism 200 includes a heat generating component. Preferably, the heat generating component is a heat generating coil 202. The heat generating mechanism 200 further includes a first pin 201, a second pin 203, and a heat generating mechanism static spring 204. .

As shown in FIG. 4, the bridge contact mechanism 300 includes a bridge movable spring 305, two bridge

static springs

307, 313, an insulating bracket 303 and a first elastic member 314; as a preferred, the bridge The contact mechanism 300 further includes a tele-signal spring 302, two tele-

signal pins

309, 301, and a second elastic member 310.

The insulating bracket 303 is movably disposed in the insulating housing 402 along the vertical axis of the insulating housing 402, and a track structure for the insulating bracket 303 to slide up and down in the insulating housing 402 is provided between the insulating bracket 303 and the insulating housing 402. The track structure includes a sliding strip 315 vertically disposed on the insulating bracket 303 and a sliding groove 403 (shown in FIG. 1) vertically disposed on the inner side wall of the insulating housing 402 and slidably engaged with the sliding bar 315.

The temperature sensing body 102 is mounted as a supporting member of the first end of the insulating bracket 303 (ie, the top end of the insulating bracket 303) in the heat generating component (ie, the heating coil 202). Specifically, the cover plate 401 is provided with a mounting flange. A mounting hole is disposed in the middle of the cover 401, and the heating coil 202 is fixedly mounted on the mounting hole of the cover 401. The inner ring of the heating coil 202 is provided with a thread, and the copper cap 101 of the temperature sensing mechanism is inverted and locked. Attached to the skeleton of the heating coil 202, the ejector 103 of the temperature sensing mechanism is movably disposed at the lower opening of the copper cap 101, and the temperature sensing body 102 is placed between the inner bottom wall of the copper cap 101 and the inner end of the ejector 103. The outer end of the jack 103 abuts against the first end of the insulating bracket 303. The second pin 203 of the heat generating mechanism abuts against the first end of the insulating holder 303; the first pin 201 and each end of the heat generating mechanism static reed 204 are electrically connected to both ends of the heating coil 202, respectively, and the second pin One end of the 203 corresponding to the one facing away from the insulating bracket 303 is in contact contact with the other end of the heat generating mechanism static reed 204, and the other ends of the first pin 201 and the second pin 203 are respectively from the right side wall of the insulating housing 402. The outer casing is taken out of the insulating casing 402 to form an external line access terminal.

The bridge type moving spring piece 305 and the remote signal moving spring piece 302 of the bridge type contact mechanism are respectively mounted on the insulating bracket 303. Specifically, the remote signal moving spring piece 302 and the bridge type moving spring piece 305 are vertically distributed, and the remote signal is moved. The reed 302 and the bridge spring reed 305 respectively move through the insulating bracket 303, and the second elastic member 310 is used between the telephoto reed 302 and the bridge spring reed 305 (the second elastic member 310 is a compression spring) Separated from each other, the remote signal moving reed 302 and the bridge moving spring 305 are respectively tightened to the insulating bracket 303. The two bridge type

static spring pieces

307 and 313 of the bridge contact mechanism are respectively fixedly mounted in the insulating housing 402. The two bridge type

static spring pieces

307 and 313 are respectively located at the two ends of the bridge type moving spring piece 305, and the bridge type is moved. The two ends of the reed 305 correspond to the second end of the insulating bracket 303 (ie, the bottom end of the insulating bracket 303), and form a contact contact with each end of the two bridge type static springs 307, 313 (ie, bridge type). A

movable contact

304, 311 is respectively disposed on one end of the movable spring 305 corresponding to the second end of the insulating bracket, and each end of the two bridge type

static springs

307, 313 is respectively provided with a

static contact

306, 312. In the initial state, the two

movable contacts

304, 311 are respectively in contact with the corresponding

static contacts

306, 312, and the bridge movable spring 305 is connected in series with the two bridge

static springs

307, 313 and the lithium battery or the lithium battery pack. The main circuit of the lithium battery is formed, and the other ends of the two bridge type

static reeds

307 and 313 are respectively led out from the bottom wall of the insulating case 402 to the outside of the insulating case 402 to form two electrical connection ends of the main circuit of the lithium battery. The first elastic member 314 is a compression spring disposed between the second end of the insulating bracket 303 and the inner bottom wall of the insulating housing 402.

The two remote signaling pins 309 and 301 of the bridge contact mechanism are fixedly mounted in the insulative housing 402, and the two remote signaling pins 309 and 301 are respectively located at two ends of the remote signal reed 302. The two ends of the reed 302 are respectively provided with a first convex hull on a side facing away from the bridge moving spring 305, and each end of the two remote signaling pins 309 and 301 corresponds to the first convex hull facing the remote moving reed 302. One side is respectively provided with a second convex hull for forming a contact contact with the corresponding first convex hull, and the other ends of the two remote information pins 309 and 301 are respectively led out from the bottom wall of the insulating outer casing 402 to form an insulating outer casing 402. The disconnection signal output of the main circuit of the lithium battery.

Preferably, the second end of the insulating bracket 303 further extends with a rod 308, and the rod 308 protrudes from the bottom wall of the insulating casing 402 outside the insulating casing 402 to constitute a state indicating rod.

A circuit breaker for cutting a power lithium battery according to the present invention has an initial state (that is, a state before the operation of the present invention) as shown in FIG. 5. At this time, each of the first pin 201 and the second pin 203 of the heat generating mechanism The other end is not energized, the temperature sensing body 102 is solid, and the

movable contacts

304, 311 at both ends of the bridge moving spring 305 are in contact with the

static contacts

306, 312 of the two bridge type

static springs

307, 313, respectively, to make lithium The main circuit of the battery is in a conducting state; the first convex hull at both ends of the remote signal reed 302 is separated from the second convex hull of the two

remote letters

309, 301 respectively; the first elastic member 314 and the second elastic member 310 are respectively It is in a compressed state.

As shown in FIG. 6, when the charging voltage of the lithium battery is too high, overcharge or overdischarge, the battery management system BMS issues an instruction to cut off the main circuit of the lithium battery, and then turns on the power of the heating coil 202 (ie, respectively, the heating mechanism is turned on) The first pin 201 and the second pin 203 are powered by the other end, so that the heating coil 202 starts to generate heat, and at the same time, the temperature sensing body 102 is heated. When the heating temperature reaches the melting point of the temperature sensing body 102, the temperature sensing body 102 The solid rod 103 and the second elastic member 310 thus release the elongation from the solid state to the liquid state, and the insulating bracket 303 drives the bridge movable spring 305 under the action of the first elastic member 314. Moving in the direction of the heat generating mechanism 200 until the two moving

contacts

304, 311 of the bridge moving spring 305 are disconnected from the

static contacts

306, 312 of the two bridge type

static springs

307, 313, respectively, thereby cutting off the lithium battery main The circuit achieves the protection function of the lithium battery. The movement of the insulating bracket 303 also drives the remote signal reed 302 to move toward the heat generating mechanism 200, so that the two first convex hulls of the remote signal reed 302 and the second convex hull of the two

remote letters

309 and 301 respectively Contact is formed to be in an on state to output a signal that the main circuit of the lithium battery is disconnected. The movement of the insulating bracket 303 also pushes up the second pin 203 of the heat generating mechanism to disconnect the second pin 203 from the heat generating mechanism static reed 204, thereby cutting off the heating circuit of the heating coil 202 and preventing the heating circuit from continuously energizing. The movement of the insulating bracket 303 also moves its shaft 308 in the direction of the interior of the insulative housing 402 as a visual indication of the state.

The circuit breaker for cutting off the power lithium battery of the present invention can be reused by replacing the built-in temperature sensing mechanism when the external mass is eliminated and the body quality of the lithium battery or the lithium battery pack is not damaged. The function.

The above embodiments are only used to further illustrate a circuit breaker for cutting a power lithium battery of the present invention, but the present invention is not limited to the embodiment, and any simple modification or equivalent change to the above embodiment according to the technical essence of the present invention is provided. And the modifications are all within the scope of protection of the technical solutions of the present invention.

Industrial applicability

The circuit breaker composed of the temperature sensing mechanism, the heat generating mechanism and the bridge contact mechanism cooperates with the battery management system (BMS) to cut off the main circuit of the lithium battery immediately when the lithium battery is over-voltage, over-charged or over-discharged, thereby Eliminate hidden dangers such as fire or explosion in lithium batteries under abnormal conditions.

Claims

A circuit breaker for actively cutting off a circuit, comprising: a casing and a temperature sensing mechanism, a heat generating mechanism and a bridge contact mechanism installed in the casing; the temperature sensing mechanism comprises a temperature sensing body that is automatically melted by heat, and generates heat. The mechanism includes a heat generating component, and the bridge contact mechanism includes a bridge movable spring, at least one pair of bridge static springs, an insulating bracket and a first elastic member; the temperature sensing body serves as a supporting member of the first end of the insulating bracket, and is controlled The heat-generating component; the bridge movable spring is mounted on the insulating bracket, and the bridge static spring is installed in the casing, and the bridge movable spring and the two pairs of contacts on the bridge static spring form a main circuit; the first elasticity The top of the piece is disposed between the second end of the insulating bracket and the inner wall of the casing; the heat generating component is controlled to heat the temperature sensing body; when the temperature reaches the melting temperature of the temperature sensing body, the first end of the insulating bracket loses support The bridge type moving spring leaves the bridge type static spring under the elastic action of the first elastic member.
The circuit breaker of the active cut-off circuit according to claim 1, wherein the second elastic member is built in the insulating bracket and abuts between the bridge movable spring and the supporting member.
The circuit breaker of the active cut-off circuit according to claim 1 or 2, wherein the bridge contact mechanism further comprises a remote signal moving spring and two remote signal pins, and the remote signal moving spring is mounted on the corresponding position. On the insulating bracket between the temperature sensing mechanism and the bridge movable spring, two remote signal pins are fixedly mounted in the housing, and the two remote signal pins are respectively located at opposite ends of the remote signal moving spring Whereas, the other ends of the two remote signal pins are respectively led out of the housing to form a disconnection signal output end of the main circuit.
The circuit breaker of the active cut-off circuit according to claim 1 or 2, wherein the heat generating component is a heat generating coil, and the heat generating mechanism further comprises a first pin, a second pin, and a heat generating mechanism static spring piece. The second pin abuts against the first end of the insulating bracket; each end of the first pin and the heat generating mechanism static reed is electrically connected to both ends of the heating coil, and one end of the second pin corresponds to the back side One side of the insulating bracket is in contact contact with the other end of the heat generating mechanism static reed, and the other ends of the first pin and the second pin are respectively led out of the casing to constitute an external line access end.
The circuit breaker of the active cut-off circuit according to claim 4, wherein the movement of the insulating holder can open the second pin, disconnect the heating system, and stop heating.
The circuit breaker of the active cut-off circuit according to claim 1 or 2, wherein the temperature sensing mechanism further comprises a copper cap and a ejector rod disposed in a cup shape, the copper cap being in an inverted state and wrapped in the In the heat generating component, the jack is disposed at a lower opening of the copper cap, the temperature sensing body is tightly disposed between the inner bottom wall of the copper cap and the inner end of the jack, and the outer end of the jack abuts the insulating bracket The first end.
The circuit breaker of the active cut-off circuit according to claim 1 or 2, wherein the second end of the insulating bracket extends with a rod body extending outside the casing to form a state indicating rod.
The circuit breaker of the active cut-off circuit according to claim 1, wherein the casing comprises an insulating casing having an upper opening and a cover plate, and the cover plate is installed at an upper opening of the insulating casing, and the two are used together. And a cavity structure for installing the temperature sensing mechanism, the heat generating mechanism and the bridge contact mechanism; and a track structure for the insulating bracket to freely slide in the casing between the insulating bracket and the insulating shell.
The circuit breaker according to claim 1, wherein the temperature sensing body is an organic temperature sensing body or a low melting point alloy type temperature sensing body.
The circuit breaker of the active cut-off circuit according to claim 1, wherein the first elastic member and the second elastic member are both compression springs.
The circuit breaker of the active cut-off circuit according to claim 1, wherein the main circuit is a lithium battery or a lithium battery pack connected in series to form a lithium battery power supply circuit.