KR20150021272A - Module of circuit-breaker sensing abnormal temperature of the battery - Google Patents

Abstract

Disclosed is a module of circuit-breaker sensing abnormal temperature of a battery. A module of circuit-breaker sensing abnormal temperature of a battery according to the present invention, includes a temperature thermistor (PTC), a main terminal which is electrically connected to a battery module in the PTC, a sub terminal which is extended in parallel to the main terminal, and a resin case which includes the PTC, the main terminal and the sub terminal. The module also includes a metal plate which is arranged on a side of a sub terminal, is combined with a deformation member whose volume and shape is changed, is attached to or detached from the sub terminal. Accordingly, the durability of a battery module and its case can be secured by preventing the generation of overheat due to simple structure and low contact resistance.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to a battery abnormality detection and prevention module, and more particularly, to a battery abnormality detection and prevention module that is simple in structure and low in contact resistance to prevent overheating, Module.

Conventionally, a safety device using a bimetal is used as a protection device for shutting off a current in order to ensure safety when an overcurrent flows to a motor of an automobile or an electric appliance, or when an abnormality such as an excessive temperature rise occurs. Background Art [0002] With the recent miniaturization and high performance of electric appliances, there has been a demand for a safety device ensuring safety and miniaturization.

For example, safety devices for secondary batteries used in mobile phones and notebook type PCs, safety devices for DC circuits such as motors and chargers for automobiles, safety devices for DC circuits such as fans for air conditioners and washing machines, Devices are required.

When the bimetal is used as a safety component of an electric product, if the temperature of the electric appliance excessively increases, the bimetal changes its shape to turn off the current so that the current is cut off. (ON) state and electric current is discharged to start energization before the safety is ensured, so that improvement is required from the viewpoint of safety.

As such an improvement method, there has been developed a safety device using a bimetal and a heating resistor in combination. An electrical product and a bimetal are connected in series and a heating resistor PTC is connected in parallel. At normal times, almost all of the current flows through the bimetal, and the current flowing through the PTC is negligible and the temperature rise of the PTC is hardly visible. However, in case of abnormality such as a rise in temperature, the bimetal is turned off, the current flowing through the bimetal is cut off, and all the current flows to the PTC. As the amount of current increases, PTC generates a large amount of joule heat, so that the temperature of the PTC rises greatly and the bimetal is continuously heated to keep the bimetal off.

Since the safety device combining the bimetal and the PTC performs such an operation, there is a problem that a safety device is highly effective, but the structure is complicated, defective fusion due to an arc may occur, and a contact resistance is large, Such heat generation may cause deformation of the insulating case. Further, a separate metal plate for preventing overheating or its substitute is required, which is a burden to manufacture.

1, a temperature protection device 10 includes a pair of terminals 11 integrated with an insulation case 12, and a heat protection element 10 covering the openings of the insulation case 12 And a PTC element 22 and a bimetal 25 accommodated in the insulating case 12 are provided.

The insulation case 12 is prepared by injecting a PTC element 22 and an insulating plastic resin into the bimetal 25.

The bimetal 25 has a conductor 26 at its tip end portion. The PTC 22, which is connected and fixed to the electrode portion 13 so as to be connected to the second terminal 11-2 at the rear end, is connected to the first terminal 11-1 (Third contact) 14 is provided in the first terminal 11-1. In order to form the main circuit, the contact point 17 is connected to the electrode portion 15 at the first terminal 11-1 and the contact point 18 is connected to the electrode portion 16 at the second terminal 11-2 These contacts 17 and 18 are disposed in contact with the conductors 26 of the bimetal 25 to switch (turn on and off) the main circuit. However, such a structure is also complicated in structure, The problem is still there.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a battery abnormality detection / prevention module capable of ensuring the durability of a battery module and its case by preventing the occurrence of overheating due to a simple structure and low contact resistance.

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned technical problems, it is an object of the present invention to provide a temperature thermistor (hereinafter referred to as PTC), a main terminal electrically connected to the battery module, a auxiliary terminal extended in parallel to the main terminal, And a resin case having a built-in auxiliary terminal, the battery abnormal temperature detection blocking module comprising: a metal plate which is disposed on one side of the auxiliary terminal and is attached to a deforming member whose volume or shape changes, And a battery abnormality detection and shutdown module.

According to an embodiment of the present invention, the deformable member may be a coil-shaped spring, one end of which is fixed to the metal plate, and the other end of which is fixed to the resin case.

According to another embodiment of the present invention, one end of the metal plate may be attached to the main terminal or the auxiliary terminal, and the other end may be attached to or detached from the auxiliary terminal or the main terminal by the deformable member.

According to another embodiment of the present invention, the deformable member may be a member that contracts or expands at an operating temperature prior to the heat treatment.

According to another embodiment of the present invention, the resin case may be provided with an elastic portion in a region facing the metal plate.

According to another embodiment of the present invention, the deformable member may be a nickel-titanium alloy (Ni-Ti), a copper zinc alloy (Cu-Zn), a copper zinc aluminum alloy (Cu-Zn-Al), a copper-cadmium alloy (Cu-Cd), a nickel aluminum alloy (Ni-Al), a copper-zinc-aluminum alloy And at least one selected from the group consisting of < RTI ID = 0.0 >

According to another embodiment of the present invention, the deformable member may further include at least one member selected from the group consisting of cobalt (Co), molybdenum (Mo), tungsten (W), and chromium (Cr).

According to the battery abnormality detection and prevention module according to the present invention, the structure is simple and the contact resistance is low, so that the overheat can be prevented.

FIG. 1 is an exploded perspective view of a conventional battery abnormality detection /
FIG. 2 is a diagram showing an embodiment of a battery abnormality detection and prevention module according to the present invention,
FIG. 3 is a view showing another embodiment of a battery abnormality temperature detection and shutdown module according to the present invention,
FIG. 4 is a diagram illustrating a battery abnormality detection and prevention module according to another embodiment of the present invention,
FIG. 5 is a diagram illustrating another embodiment of the abnormal battery temperature detection and shutdown module according to the present invention,
FIG. 6 is a diagram illustrating another embodiment of the abnormal battery temperature detection and shutdown module according to the present invention.

These and other objects, features and other advantages of the present invention will become more apparent by describing in detail preferred embodiments of the present invention with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a battery abnormality detection and prevention module according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

The battery abnormality detection and prevention module according to the present invention includes a temperature thermistor (hereinafter, referred to as PTC), a main terminal electrically connected to the battery module, a subsidiary terminal extended in parallel to the main terminal, A battery abnormality detection and prevention module including a resin case having a built-in auxiliary terminal, the battery abnormal temperature detection prevention module comprising: a metal plate which is disposed on one side of the auxiliary terminal and is bonded to a deformable member whose volume or shape changes, .

Referring to FIG. 2, a battery abnormality detection and shutdown module 100 according to an embodiment of the present invention is illustrated. The temperature sensor includes a temperature thermistor (PTC) 110 and a main terminal 111 , 112 and auxiliary terminals 111 ', 112' extending in parallel thereto.

The resin case 140 molded and injected into the PCT 110, the main terminals 111 and 112 and the auxiliary terminals 111 'and 112' may be molded by a conventional injection molding method, Will be described later in detail.

The metal plate 130 is disposed on one side of the auxiliary terminals 111 'and 112' and is joined to the deformable member 120 whose volume or shape is changed to closely contact or detach the auxiliary terminals 111 'and 112' The connection between the one end of the deformable member 120 and the metal plate 130 is physically fixed in addition to the connection such as soldering, irrespective of the electrical connection, It is needless to say that various fixing methods can be used, such as a coupling relationship in which the metal plate 130 is inserted and fixed in the one groove portion 142.

When the deformable member is physically fixed to the resin case, the other end of the deformable member 120 and the resin case 140 are fixed by an adhesive in a sufficient relationship or the other end of the deformable member 120 is fixed Can be inserted and fixed in the insertion portion 144 having the insertion groove 144 'in the resin case.

In this structure, the metal plate 130 maintains a state of being in close contact with the auxiliary terminals 111 'and 112' so as to be energized at room temperature. When the temperature rises and the deformable member 120 contracts, And the flow of the current is formed by the PCT 110. As shown in FIG.

Examples of the deformable member 120 that performs such an operation include a deformable member having a volume or shape that changes in accordance with the temperature, such as a nickel-titanium alloy (Ni-Ti), a copper-zinc alloy (Cu- Al alloys (Cu-Zn-Al), copper cadmium alloys (Cu-Cd), nickel aluminum alloys (Ni-Al), copper- And at least one selected from the group consisting of

Such an alloy is subjected to heat treatment in order to memorize the operating temperature after molding the deformable member 120 into a shape like a spring. For example, by preceding the above-mentioned heat treatment, the deformable member 120 is heated at an operating temperature of 70 to 80 ° C. The operating temperature is a temperature at which the deformable member 120 expands or shrinks, and may be set differently for each battery type.

That is, when the heat treatment is performed in a state of expanding the deformable member 120, it expands at an operating temperature. On the other hand, when the heat treatment is performed in a contracted state, it is understood as a mechanism of contracting at an operating temperature. ) Is heat-treated at an initial total length L ₀ at an operating temperature of, for example, 70 to 80 ° C, let L ₁ be the case where the deformable member 120 expands, and L ₁ -L ₀ can have a positive value , And when the deformable member 120 contracts by L ₂ , L ₂ -L ₀ has a negative value.

At least one member selected from the group consisting of cobalt (Co), molybdenum (Mo), tungsten (W), and chromium (Cr) is added to the deformable member 120 to control the expansion or contraction characteristics at this operating temperature. .

3, a battery abnormality detection and shutdown module 100 according to another embodiment of the present invention may include a temperature thermistor (PTC) 110 and a main terminal (not shown) 111 ', 112', and auxiliary terminals 111 ', 112' extending in parallel to the auxiliary terminals 111 ', 112' and connected to the deformable member 120 having a variable volume or shape, The metal plate 130 is closely adhered to or detached from the auxiliary terminals 111 'and 112', and is similar to the structure of FIG. 1 described above. Therefore, by utilizing the internal void space V of the resin case 140 It can be said that the difference is considered.

That is, the present embodiment reflects the design of the resin case in which the position of the deformable member 120 can be positioned above the thermistor (PTC) 110 with reference to the thermistor (PTC) 110.

4, a battery abnormality detection and shutdown module 100 according to another embodiment of the present invention is shown. The temperature sensor includes a temperature thermistor (PTC) 110 and a main terminal 111 and 112 and auxiliary terminals 111 'and 112' extending in parallel to the main terminals 111 and 112 and the auxiliary terminals 111 'and 112' And a metal plate (not shown) is disposed on one side of the auxiliary terminal and is coupled to the deformable member 120 whose volume and shape are changed and is closely attached to or detached from the auxiliary terminal. The coupling between the one end of the deformable member and the metal plate 130 is not physically fixed except for the connection such as soldering and is not required to be electrically conducted. A portion of the metal plate 130, City) is negative can be used a variety of fixing methods such as bonding relationship it is fixed in the insert as well.

In this structure, the metal plate 130 maintains a state of being in close contact with the auxiliary terminals 111 'and 112' so as to be energized at room temperature. In the situation where the temperature rises and the deformable member 120 expands, 'And 112' and the metal plate 130 are mutually desorbed, so that current flow is formed in the PCT 110.

5 shows another embodiment of the battery abnormality detection and shutdown module 100 according to the present invention. The thermistor (PTC) 110, the main terminals 111 and 112, the auxiliary terminal 111 The metal plate 130 is provided with a deformable member 120 and a metal plate 130. The metal plate 130 has an inner region of the resin case 140 opposed to the metal plate 130, So that the metal plate 130 is attached to the auxiliary terminals 111 'and 112' before the shape and the volume of the deformable member 120 change due to the temperature change, And it is possible to stabilize the attachment and detachment by making the force balance during the detachment by the change.

The elastic part 142 protrudes from the resin case 140 at the time of injection molding. The elastic part 142 is provided not only in a semi-arcuate shape as shown in the drawing but also in a polygonal shape, I will do my best.

The lower part of the deformable member 120 is required to be laminated with an insulating layer 125 to prevent the main terminal 112 from being electrically energized and the deformable member is fixed to the upper part of the insulating layer 125 (Not shown) similar to the insertion portion 144 having the insertion groove 144 'described above.

6, a temperature thermistor (PTC) 110, a main terminal 111 and a main terminal 112 are connected in parallel to each other. The auxiliary terminals 111 'and 112' and the resin case 140 are similar to those described above, but one end of the metal plate 130 is fixedly attached to the auxiliary terminal 111 ' Is attached to or detached from the auxiliary terminal 112 'by the member 120.

Although one end of the metal plate 130 is shown attached to and fixed to the auxiliary terminal 111 ', even if the auxiliary terminal 111' is removed and is directly fixed to the main terminal 111, I will be satisfied if I can be within the range.

Likewise, it can be seen that the other auxiliary terminal 112 'may also be removed and directly coupled to the other main terminal 112.

An insulating layer 125 is required to be laminated on the lower portion of the deformable member 120 to prevent the main terminal 112 from being electrically connected to the deformable member 120. The deformable member is fixed to the upper portion of the insulating layer 125 (Not shown) similar to the insertion portion 144 having the insertion groove 144 'described above.

A temperature thermistor (PTC) 110, main terminals 111 and 112,
Auxiliary terminals 111 'and 112', resin case 140,
The metal plate 130, the deformable member 120

Claims (7)

A battery pack including a temperature thermistor (hereinafter referred to as PTC), a main terminal electrically connected to the battery module, a subsidiary terminal extended in parallel to the main terminal, and a resin case including the PTC, In the abnormal temperature detection blocking module,
And a metal plate which is disposed on one side of the auxiliary terminal and is coupled to a deforming member whose volume or shape changes to closely contact or detach from the auxiliary terminal.
The method according to claim 1,
Wherein the deformable member comprises a coil spring, one end of which is fixed to the metal plate, and the other end of which is fixed to the resin case.
The method according to claim 1,
Wherein one end of the metal plate is attached to the main terminal or the auxiliary terminal and the other end of the metal plate is attached to or detached from the auxiliary terminal or the main terminal by a deforming member.
The method according to claim 1,
Wherein the deformable member contracts or expands at an operating temperature prior to the heat treatment.
The method according to claim 1,
Wherein the resin case has an elastic portion in a region facing the metal plate.
3. The method according to claim 1 or 2,
The deformable member varies in volume and shape depending on the temperature. The deformable member may be made of a metal such as a nickel-titanium alloy (Ni-Ti), a copper-zinc alloy (Cu-Zn), a copper- And at least one selected from the group consisting of Cu-Cd, Ni-Al, Cu-Zn-Al and Cu-Al-Ni alloy. Battery fault detection module.
The method according to claim 6,
Wherein the deformable member further comprises at least one member selected from the group consisting of cobalt (Co), molybdenum (Mo), tungsten (W), and chromium (Cr).

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