JP5901055B2 - breaker - Google Patents

Description

  The present invention relates to a breaker that cuts off a current when the temperature is higher than a preset temperature.

  Devices such as battery packs and motors can improve safety by interrupting current when the temperature is abnormally high. For this purpose, a breaker is used that switches the contact off when the set temperature is reached. For example, a battery pack with a built-in lithium ion battery has a high temperature when charged and discharged in an abnormal use state. Therefore, a built-in breaker can be used safely by cutting off the current at an abnormally high temperature. Further, since the temperature of the motor or the like may become abnormally high in an overloaded state or an abnormal current flow, in this state, the current can be cut off by the breaker to protect the motor and be used safely.

As a breaker used for such an application, a breaker has been developed that cuts off a current when a battery is at an abnormally high temperature. (See Patent Document 1)
This breaker is shown in FIG. This breaker is a non-energized breaker in which a bimetal 108 is disposed between a fixed contact metal plate 104 provided with a fixed contact 105 and a movable contact metal plate 106 having a movable contact 107 in contact with the fixed contact 105. is there. The breaker is deformed so that the bimetal 108 is reversed when the ambient temperature becomes high, and the movable contact 107 is separated from the fixed contact 105 to interrupt the current.

JP 2006-338927 A

  The above breaker detects the ambient temperature with the bimetal, and when the ambient temperature becomes higher than the set temperature, the bimetal is inverted and switched from the on state to the off state. However, even when the ambient temperature is lower than the set temperature, it may be switched to the off state when the current of the breaker increases. This is because the movable contact metal plate generates heat due to the Joule heat of the current flowing through the breaker, and the generated heat heats and reverses the bimetal. Since the movable contact metal plate has a structure in which an elastic arm portion that can be switched on and off is provided and a movable contact is provided at the tip thereof, a current flows through the elastic arm portion in the on state, and the Joule heat of this current causes the bimetal to pass through the bimetal. It becomes a structure to heat. Heat generation due to Joule heat of the movable contact metal plate can be reduced by reducing the electric resistance of the movable contact metal plate. This is because the heat generated by Joule heat is proportional to the product of the square of the current and the electrical resistance.

  However, if a metal plate having a small electric resistance is used for the movable contact metal plate, it is impossible to connect the lead plate or the like stably and reliably to the connection terminal of the movable contact metal plate. A lead plate or the like is connected to the connection terminal by resistance welding. However, if the electrical resistance of the connection terminal is reduced, the process of resistance welding to the connection terminal will reduce the heat generation of the connection terminal and make it difficult to melt. is there.

  The present invention was developed for the purpose of solving the above-described drawbacks, and prevents the malfunction that can be switched off by a large current, while reliably connecting the connection terminals to lead plates, battery packs, etc. It is to provide a breaker that can be resistance-welded to externally connected equipment.

Means for Solving the Problems and Effects of the Invention

The breaker of the present invention includes an outer case 1, a fixed contact metal plate 4 having a fixed contact 5 fixed to the outer case 1, and a movable contact 7 at a position facing the fixed contact 5 of the fixed contact metal plate 4. And a movable contact metal plate 6 partially fixed to the outer case 1 so that the movable contact 7 can be moved, and between the movable contact metal plate 6 and the fixed contact metal plate 4, And a bimetal 8 for switching the metal plate 6 from on to off. The movable contact metal plate 6 and the fixed contact metal plate 4 are electrically connected to connection terminals 53 and 54 connected to an external connection device. Further, a resistance lead plate 3 having a larger electric resistance than that of the movable contact metal plate 6 is laminated on the movable contact metal plate 6 and the laminated portion is electrically connected to the movable contact metal plate 6. A connection terminal 53 that is electrically connected is provided. The breaker according to the present invention includes an outer case 1, an insulating case 2 in which a fixed contact metal plate 4 and a movable contact metal plate 6 are fixed, and a resistance lead plate 3 fixed to the insulating case 2. It can comprise and can be set as the structure which obstruct | occludes the opening part of the insulation case 2 with the resistance lead board 3. FIG.

The above breaker has a feature that the connection terminal can be reliably and stably connected to an externally connected device or lead such as a lead plate or a battery pack while preventing a malfunction that can be switched to an OFF state with a large current. It connects the resistance lead plate with a large electrical resistance to the movable contact metal plate while reducing the electrical resistance of the movable contact metal plate to limit the heat generation due to Joule heat, and provides a connection terminal on this resistance lead plate. This is because a lead plate, a battery, or the like can be resistance-welded to a connection terminal of a resistance lead plate having a larger electrical resistance than the movable contact metal plate.
In addition, the above breaker uses the resistance lead plate as a part of the outer case, and further fixes the fixed contact metal plate and the movable contact metal plate to the insulation case, and resists the storage portion provided in the insulation case. It can be closed with a lead plate.

The breaker of the present invention includes an outer case 1, a fixed contact metal plate 4 having a fixed contact 5 fixed to the outer case 1, and a movable contact 7 at a position facing the fixed contact 5 of the fixed contact metal plate 4. And a movable contact metal plate 6 partially fixed to the outer case 1 so that the movable contact 7 can be moved, and between the movable contact metal plate 6 and the fixed contact metal plate 4, And a bimetal 8 for switching the metal plate 6 from on to off. The movable contact metal plate 6 and the fixed contact metal plate 4 are electrically connected to connection terminals 53 and 54 connected to an external connection device. Further, a resistance lead plate 3 having a larger electric resistance than that of the movable contact metal plate 6 is laminated on the movable contact metal plate 6 and the laminated portion is electrically connected to the movable contact metal plate 6. A connection terminal 53 that is electrically connected is provided. In the breaker of the present invention, the outer case 1 is composed of the insulating case 2 and the resistance lead plate 3, and the insulating case 2 is provided with the first outer wall 11A and the second outer wall 11B. A storage space 20 is provided between the outer wall 11A and the second outer wall 11B. In the storage space 20, the bimetal 8 and the elastic arm portion 6A of the movable contact metal plate 6 are stored, and the first outer wall 11A has a fixed contact. The metal plate 4 is fixed, the non-movable portion 6B of the movable contact metal plate 6 is fixed to the second outer wall 11B, and the resistance lead plate 3 is fixed to the insulating case 2 to open the storage space 20. The exposed lead terminal 3 is closed, and the resistance lead plate 3 is laminated in contact with the non-movable portion 6B of the movable contact metal plate 6 and fixed to the insulating case 2, and the outer surface of the resistance lead plate 3 is exposed to the outside. 43, the exposed terminal 43 is connected to the connection terminal. It can be provided on the upper surface of the case 1 as 3.
The above breaker has a feature that the connection terminal can be reliably and stably connected to an externally connected device or lead such as a lead plate or a battery pack while preventing a malfunction that can be switched to an OFF state with a large current. It connects the resistance lead plate with a large electrical resistance to the movable contact metal plate while reducing the electrical resistance of the movable contact metal plate to limit the heat generation due to Joule heat, and provides a connection terminal on this resistance lead plate. This is because a lead plate, a battery, or the like can be resistance-welded to a connection terminal of a resistance lead plate having a larger electrical resistance than the movable contact metal plate.
  In the above breaker, the connection terminal of the resistance lead plate is provided on the upper surface of the outer case, and the lead plate or the like can be connected thereto. In particular, since this breaker uses the exposed terminal of the resistance lead plate having a larger electrical resistance than the movable contact metal plate as the connection terminal, the lead plate can be reliably and resistance welded. Breakers with this structure are used in battery packs, reducing the number of leads used and reducing component costs. In addition, the circuit board leads can be easily and efficiently connected to reduce manufacturing costs. Realize. This is because the above breaker has an exposed terminal on the upper surface of the insulating case to be a connection terminal, and the lead connected to the circuit board is directly welded to the connection terminal to connect the circuit board and the breaker. This is because the lead used in the process can be omitted. Furthermore, since the breaker having this structure is provided with the connection terminal of the exposed terminal on the upper surface, the connection terminal of the exposed terminal is insulated from the unit cell by the insulating case. The connection terminal insulated by the insulation case can directly weld the lead to the breaker in a state where the breaker is connected to the unit cell. This is because the connection terminal to which the insulating case is welded is insulated from the unit cell. This breaker is a process in which a circuit board lead is welded to a connection terminal provided as an exposed terminal on the upper surface of the outer case, and an insulating case of the breaker is arranged between the connection terminal of the exposed terminal and the unit cell to expose the circuit board. Terminals and leads can be insulated from unit cells. Therefore, by placing the lead on the connection terminal which is the exposed terminal and performing resistance welding, the lead and the unit cell can be insulated and reliably welded. Further, since the above breaker is provided with the connection terminal of the exposed terminal on the upper surface, in the process of welding the lead of the circuit board, the welding electrode is pressed in the same direction as shown by the arrow in FIG. Since the two leads 36 can be welded, there is a feature that the two leads 36 can be easily and efficiently welded without changing the direction of the welder.

In the breaker of the present invention, a heater 9 can be disposed between the bimetal 8 and the fixed contact metal plate 4.
This breaker can heat a bimetal with a heater and hold | maintain a movable contact metal plate in an OFF state.

In the breaker of the present invention, the movable contact metal plate 6 and the resistive lead plate 3 can be made of phosphor bronze, and the movable contact metal plate 6 can be made of phosphor bronze having a copper content higher than that of the resistive lead plate 3.
This breaker can make the movable contact metal plate elastic with phosphor bronze, and the resistance lead plate uses phosphor bronze with low copper content to increase the electrical resistance and connect the resistance lead plate A lead plate or the like can be connected to the terminal stably and securely.

In the breaker of the present invention, the movable contact metal plate 6 can be made of phosphor bronze, and the resistance lead plate 3 can be made of a nickel or nickel alloy metal plate.
This breaker can make the movable contact metal plate elastic with phosphor bronze, and the resistance lead plate uses a metal plate of nickel or nickel alloy to increase the electrical resistance. Lead plate etc. can be connected stably and reliably.

Furthermore, the breaker of this invention can provide the fixed contact metal plate 4 with the connection terminal 54 which protrudes outside the outer case 1.
This breaker can easily connect a lead plate or the like to a connection terminal of a fixed contact metal plate protruding from the outer case.

Furthermore, in the breaker of the present invention, the connection terminal 54 of the exposed terminal 44 exposed on the surface of the outer case 1 can be provided on the bottom surface of the fixed contact metal plate 4.
This breaker can connect a lead board etc. here by making the exposed terminal provided in the bottom face of a fixed contact metal plate into a connection terminal.

  By the way, in this specification, the upper surface and lower surface of the breaker provided with the exposed terminal are specified in the drawings.

It is sectional drawing which shows the conventional breaker. It is a perspective view of the breaker concerning one Example of this invention. It is a vertical longitudinal cross-sectional view of the breaker shown in FIG. It is sectional drawing which shows the OFF state of the breaker shown in FIG. It is a VV sectional view taken on the line of the breaker shown in FIG. It is VI-VI sectional view taken on the line of the breaker shown in FIG. It is the VIII-VIII sectional view taken on the line of the breaker shown in FIG. It is sectional drawing which shows another example of a connection rib, Comprising: It is a figure corresponded in the VIII-VIII line cross section of FIG. It is sectional drawing which shows another example of a connection rib, Comprising: It is a figure corresponded in the VV sectional view of FIG. It is a vertical longitudinal cross-sectional view of the breaker concerning the other Example of this invention. It is a perspective view of the breaker concerning the other Example of this invention. It is a vertical longitudinal cross-sectional view of the breaker shown in FIG. It is the XIII-XIII sectional view taken on the line of the breaker shown in FIG. It is a vertical longitudinal cross-sectional view of the breaker concerning the other Example of this invention. It is a perspective view which shows the assembly process of a battery pack provided with the breaker shown in FIG. It is a partially expanded sectional view of a battery pack provided with the breaker shown in FIG. It is a perspective view which shows the assembly process of the battery pack shown in FIG. It is a partially expanded sectional view of the battery pack provided with the breaker concerning the other Example of this invention. It is a partially expanded sectional view of the battery pack provided with the breaker concerning the other Example of this invention. It is a partially expanded sectional view of the battery pack provided with the breaker concerning the other Example of this invention. It is a partially expanded sectional view of the battery pack provided with the breaker concerning the other Example of this invention. It is a partially expanded sectional view of the battery pack provided with the breaker concerning the other Example of this invention.

  Embodiments of the present invention will be described below with reference to the drawings. However, the embodiment shown below exemplifies a breaker for embodying the technical idea of the present invention, and the present invention does not specify the breaker as follows. Further, in this specification, in order to facilitate understanding of the scope of claims, numbers corresponding to the members shown in the examples are indicated in the “claims” and “means for solving problems” sections. It is added to the members. However, the members shown in the claims are not limited to the members in the embodiments.

  The following types of breakers deform the bimetal at ambient temperature, the deforming bimetal deforms the movable contact metal plate, and is switched to the OFF state to cut off the current. The breaker described in detail below incorporates a heater for heating the bimetal. However, the breaker of this invention does not necessarily need to incorporate a heater. This is because the bimetal can detect the ambient temperature and switch the movable contact off.

  The breaker incorporating the heater shown below can be held in an off state by cutting off the current by heating the bimetal with the heater. This is because the heater can be energized in the off state, and the bimetal can be heated by the energized heater and kept in the off state. This breaker is built in the battery pack and can further improve the safety of the battery pack. After the battery pack reaches an abnormal temperature and the current is cut off by the breaker, the heater can be energized and held in the off state by the battery, so the breaker is kept off as long as the battery can be discharged. This is because it can be kept in a shut-off state. When the battery is completely discharged, even if the heater cannot be energized and the heater cannot heat the bimetal and returns to the on state, the battery cannot be discharged in this state, so safety is ensured. .

  A breaker 40 shown in FIGS. 2 to 9 fixes a fixed contact metal plate 4 and a movable contact metal plate 6 to the exterior case 1 and deforms the movable contact metal plate 6, and the bimetal 8. A heater 9 for heating is incorporated.

  The outer case 1 is formed of a plastic insulating case 2 and a resistance lead plate 3. The outer case 1 has the fixed contact metal plate 4 inserted and fixed to the bottom 13 of the insulating case 2 and fixed to the upper surface, and the resistance lead plate 3 is fixed to the upper surface. The insulating case 2 is provided at both end portions so as to project the first outer wall 11A and the second outer wall 11B, and further, the opposing walls 12 that connect the first outer wall 11A and the second outer wall 11B. A storage space 20 is provided between the pair of outer walls 11 and the pair of opposed walls 12. The storage space 20 is closed at the bottom by the fixed contact metal plate 4 that is fixed by insert molding and closed at the top by the resistance lead plate 3. Therefore, the exterior case 1 has the fixed contact metal plate 4 exposed on the bottom surface and the resistance lead plate 3 exposed on the top surface. The resistance lead plate 3 is not fixed to the insulating case 2 made of plastic by insert molding, and almost the entire surface is exposed on the upper surface side.

  The resistance lead plate 3 is a metal plate having a larger electric resistance than the movable contact metal plate 6 and is provided with a connection terminal 53. The connection terminal 53 is a terminal for connecting the breaker 40 to the outside, and is connected to a lead such as a lead plate or a lead wire by resistance welding or directly connected to a battery or the like by resistance welding. The breaker 40 has a pair of connection terminals 53, 54, one connection terminal 53 is connected to the movable contact metal plate 6, and the other connection terminal 54 is connected to the fixed contact metal plate 4. In the breaker 40 of FIGS. 2 to 4, the connection terminal 53 connected to the movable contact metal plate 6 is provided not on the movable contact metal plate 6 but on the resistance lead plate 3 connected thereto. A connection terminal 53 connected to the movable contact metal plate 6 is provided at one end of the movable contact metal plate 6.

  The resistance lead plate 3 is a metal plate having an electric resistance optimum for resistance welding, and the movable contact metal plate 6 is a metal plate having a low electric resistance in order to limit heat generation due to Joule heat of the energized current. . The breaker 40 does not reverse the bimetal 8 by Joule heat of the movable contact metal plate 6 with a current smaller than the rated current, and the bimetal 8 detects the ambient temperature and is switched to the off state. Therefore, the movable contact metal plate 6 has an electrical resistance that does not invert the bimetal 8 with the Joule heat of the rated current of the breaker 40. The Joule heat of the movable contact metal plate 6 increases in proportion to the product of the square of the current and the electric resistance. Therefore, the electrical resistance of the movable contact metal plate 6 is reduced as the rated current increases.

  The movable contact metal plate 6 that does not invert the bimetal 8 with the Joule heat of the rated current has a considerably small electric resistance in a breaker with a large rated current. When a movable contact metal plate having a small electrical resistance is provided with a connection terminal, heat generation when resistance welding the lead plate or the like is reduced here, and the lead plate or the like cannot be reliably and stably connected. In order to prevent this problem, the breaker according to the present invention is not provided with a connection terminal on the movable contact metal plate 6 having a small electric resistance, but is laminated on the metal plate 6 and electrically connected to the resistance lead plate 3. A connection terminal 53 is provided on the plate 3. The resistance lead plate 3 is a metal plate having a larger electric resistance than the movable contact metal plate 6. The resistance lead plate 3 having an electric resistance larger than that of the movable contact metal plate 6 generates a large amount of heat when resistance welding the leads, and the leads can be reliably and stably connected.

  The movable contact metal plate 6 and the resistance lead plate 3 can both be made of phosphor bronze, and the resistance lead plate 3 can be made of phosphor bronze having a smaller copper content than the movable contact metal plate 6 to increase the electric resistance. Further, the movable contact metal plate 6 can be made of phosphor bronze, the resistance lead plate 3 can be made of a nickel plate or a nickel alloy plate, and the electric resistance of the resistance lead plate 3 can be made larger than that of the movable contact metal plate 6. In particular, a breaker in which the resistance lead plate is a nickel plate or a nickel alloy plate can be laminated with a lead plate of a nickel plate or a nickel alloy plate, and the leads can be connected more stably by resistance welding.

  The movable contact metal plate 6, the fixed contact metal plate 4 and the resistance lead plate 3 are fixed to the insulating case 2. The insulating case 2 is a storage space with a pair of outer walls 11 composed of a first outer wall 11A and a second outer wall 11B, and a pair of opposing walls 12 connecting the first outer wall 11A and the second outer wall 11B. An outer peripheral wall 10 that surrounds 20 is constituted. Therefore, the storage space 20 is surrounded by the outer peripheral wall 10, the bottom surface is closed by the fixed contact metal plate 4, and the upper surface is closed by the resistance lead plate 3, so that the inside is closed and the bimetal 8 is formed inside. And the heater 9 is housed.

  The insulating case 2 is formed by insert-molding a part of the fixed contact metal plate 4 on the first outer wall 11A, and an intermediate portion 4B of the fixed contact metal plate 4 in the middle of the first outer wall 11A in FIGS. It is fixed. Therefore, the fixed contact metal plate 4 is fixed to the insulating case 2 in a state of penetrating the first outer wall 11A, the portion exposed to the inside of the storage space 20 is used as the fixed contact 5, and the portion pulled out to the outside is the connection terminal 54. It is said.

  In the insulating case 2, the non-movable portion 6B of the movable contact metal plate 6 is fixed to the second outer wall 11B, and the elastic arm portion 6A of the movable contact metal plate 6 is disposed in the storage space 20. The breaker 40 in FIGS. 3 and 4 fixes the non-movable portion 6B of the movable contact metal plate 6 to the upper end surface of the second outer wall 11B. The movable contact metal plate 6 is bonded and fixed to the second outer wall 11B, or sandwiched between the resistance lead plates 3 and fixed to the upper end surface of the second outer wall 11B. The exterior case 1 shown in the figure has one end portion of the resistive lead plate 3 laminated in contact with the non-movable portion 6B of the movable contact metal plate 6 and fixed to the insulating case 2 to fix the resistive lead plate 3 to the movable contact metal plate. 6 is electrically connected. The resistance lead plate 3 and the movable contact metal plate 6 are more reliably electrically connected by laser welding the laminated portion. In this structure, since the resistance lead plate 3 is directly laminated and fixed on the movable contact metal plate 6, the resistance lead plate 3 can be electrically connected to the movable contact metal plate 6 while making the whole thinner.

  The resistance lead plate 3 is provided with a connection terminal 53 for resistance welding a lead plate connected to the outside. In the breaker 40 of FIGS. 2 to 4, one end of the resistance lead plate 3 protrudes to the outside of the outer case 1, and the protruding portion 3 </ b> X serves as a connection terminal 53. In the breaker 40 of FIG. 10, the upper surface of the resistance lead plate 3 is exposed on the upper surface of the insulating case 2 to form an exposed terminal 43, and the exposed terminal 43 is used as a connection terminal 53.

  Furthermore, the insulating case 2 shown in the cross-sectional views of FIGS. 3 to 5 is provided with a storage recess 21 in which the heater 9 is disposed at the bottom of the storage space 20. The storage recess 21 is in the center of the storage space 20, and the bottom surface thereof is closed by the tip end 4 </ b> A of the fixed contact metal plate 4. The storage recess 21 has an inner shape slightly larger than the outer shape of the heater 9 so that the heater 9 can be inserted therein. The storage recess 21 is provided with a protrusion 14 along the outer peripheral edge. The heater 9 inserted into the storage recess 21 slightly protrudes from the upper surface of the protruding portion 14 and places the bimetal 8 that is curved on the upper surface in a thermally coupled state.

  In the storage space 20, the bottom surface of the storage recess 21 is closed with the fixed contact metal plate 4, and the outer bottom surface of the storage recess 21 is closed with the plastic of the insulating case 2. The insulating case 2 is fixed to the insulating case 2 by insert-molding a fixed contact metal plate 4 on a plastic bottom 13 that closes the bottom of the storage space 20 outside the storage recess 21.

  The resistance lead plate 3 that closes the upper surface of the storage space 20 is fixed to the outer wall 11 of the insulating case 2 at both ends without insert molding. In the breaker 40 of FIGS. 2 to 4, both end portions of the resistance lead plate 3 are fixed to upper end surfaces of the first outer wall 11A and the second outer wall 11B. The resistance lead plate 3 is fixed to the insulating case 2 via a connecting rib 15 that is integrally formed on the first outer wall 11A and the second outer wall 11B. 3 and FIG. 4, the connecting rib 15 for connecting the resistance lead plate 3 is provided so as to protrude from the front end surface of the outer wall 11, as indicated by a chain line. The resistance lead plate 3 is provided with a through hole 25 that allows the connecting rib 15 to pass therethrough, and the connecting rib 15 is inserted into the through hole 25 to fix the resistance lead plate 3 to the insulating case 2. In a state where the connecting rib 15 is inserted into the through hole 25, the tip of the connecting rib 15 is heated and pressed to be crushed, or crushed by ultrasonic vibration, so that the resistance lead plate 3 is securely attached to the tip of the outer wall 11 of the insulating case 2. That is, it is fixed to the upper surface. With the above structure, the resistance lead plate 3 can be reliably and easily fixed to the accurate position of the insulating case 2. However, the resistance lead plate can also be bonded and fixed to the upper surface, which is the tip surface of the insulating case. The resistance lead plate that is bonded and fixed to the insulating case is also provided with a through hole, a connecting rib that is inserted into the through hole is provided on the outer wall, and the connecting rib is inserted into the through hole, so that the insulating lead is placed in a fixed position. Can be fixed securely.

  The resistance lead plate 3 is provided with through holes 25 at four corners, and connecting ribs 15 inserted into the respective through holes 25 are provided on the front end surface of the outer wall 11 of the insulating case 2. 6 shows a cross-sectional view of the first outer wall 11A to which the resistance lead plate 3 is fixed, and FIG. 7 shows a cross-sectional view of the second outer wall 11B. The first outer wall 11 </ b> A shown in FIG. 6 protrudes from the upper end surface of the opposing wall 12 provided on both sides of the storage space 20 and is provided with connecting ribs 15. The connecting rib 15 is formed in the shape shown on the right side of the figure and is inserted into the through-hole 25 to crush the tip and fix the resistance lead plate 3 as shown on the left side. The first outer wall 11A shown in FIG. 6 is provided with the connecting rib 15 on the upper surface of the opposing wall 12 provided on both sides of the storage space 20, but the first outer wall 11A is a line VIII-VIII in FIG. As shown in the cross-sectional view of FIG. 8, the resistance lead plate 3 can be fixed by providing a connecting rib 15 on the upper surface of the first outer wall 11A. Further, as shown in the cross-sectional view of FIG. 9, the exterior case 1 is provided with a connecting rib 15 protruding from the upper surface of the facing wall 12 at the position indicated by the line V-V in FIG. It is also possible to provide the through hole 25 in the resistance lead plate 3 and fix the intermediate portion of the resistance lead plate 3 to the insulating case 2.

  Further, the resistance lead plate 3 shown in the cross-sectional views of FIGS. 5 to 7 is provided with a bent side wall 22 that is bent along the outer surface of the facing wall 12 on both sides, and is opposed to the bent side wall 22. The wall 12 is connected by a locking structure. The resistance lead plate 3 shown in the figure is provided on the bent side wall 22 and the locking projection 16 provided on the bent side wall 22 with the locking structure of the bent side wall 22 and the facing wall 12 protruding from the outside. It comprises a locking hole 26 that guides and locks the locking projection 16. The locking projection 16 is provided with an inclined surface 16A that gradually protrudes in the insertion direction so that the locking projection 16 can be smoothly guided to the locking hole 26.

  Further, in the locking structure of FIG. 8, a locking piece 27 that is bent inward is provided at the distal end edge of the bent side wall 22, and the locking recess 17 that guides the locking piece 27 is provided opposite to the insulating case 2. Provided on the outer surface of the wall 12, the locking piece 27 is guided to the locking recess 17, and the resistance lead plate 3 is fixed to the insulating case 2 with a locking structure.

  Further, the locking structure of FIG. 9 is provided with a locking piece 27 bent inward at the front end edge of the bent side wall 22, and this locking piece 27 is hooked on the bottom surface of the opposing wall 12 to form a resistance lead plate. 3 is fixed to the insulating case 2 with a locking structure. These locking structures are formed by elastically deforming the bent side wall 22 and connecting it to the insulating case 2 with a locking structure. In the connected state, the locking convexity is generated by the elastic restoring force of the bent side wall 22. The part 16 and the locking piece 27 are held in a position to be hooked on the locking hole 26, the locking recess 17 or the bottom surface.

  The resistance lead plate 3 provided with the connection terminal 53 protruding from the insulating case 2 can be insulated by providing an insulating film (not shown) on the surface of the portion excluding the connection terminal 53. This insulating film can be provided by applying an insulating paint on the surface of the resistance lead plate 3. However, the insulating layer can be provided by attaching an insulating sheet to the surface of the resistance lead plate. Thus, since the breaker provided with the insulating film on the resistance lead plate can insulate the surface of the resistance lead plate with the insulating film, it can be built in the device in a contact state.

  In the storage space 20 of the insulating case 2, the heater 9, the bimetal 8, and the elastic arm portion 6 </ b> A of the movable contact metal plate 6 are stored in order from the bottom, and the fixed contact metal is placed on the first outer wall 11 </ b> A of the insulating case 2. The intermediate part 4B of the plate 4 is fixed, and the non-movable part 6B of the movable contact metal plate 6 is fixed to the second outer wall 11B.

  The fixed contact metal plate 4 is fixed to the insulating case 2 by insert molding. The fixed contact metal plate 4 is insert-molded so that the front end portion 4A is embedded in the bottom portion 13 of the storage space 20 and the intermediate portion 4B is embedded from the bottom portion 13 of the storage space 20 to the first outer wall 11A of the insulating case 2. It is fixed to the insulating case 2. The fixed contact metal plate 4 shown in FIGS. 3 and 4 is provided with a step 4D so that a portion embedded in the first outer wall 11A is higher than a portion closing the bottom of the housing recess 21. Is embedded in the bottom portion 13 of the insulating case 2, and the rear end side of the stepped portion 4 </ b> D is exposed on the upper surface of the bottom portion 13, and this exposed portion is used as the fixed contact 5.

  The heater 9 generates heat when energized and heats the bimetal 8. The heater 9 is a PTC heater having a thickness in which an opposing surface is an oval or a rectangle, and electrodes are provided on the upper surface and the lower surface. However, it is not always necessary to use a PTC heater as the heater, and all heaters that can be energized to heat the bimetal 8 can be used. The heater 9 provided with electrodes on the upper and lower surfaces makes the lower surface contact the fixed contact metal plate 4 and allows the upper surface to contact the movable contact metal plate 6 via the bimetal 8. In the heater 9, when the movable contact 7 of the movable contact metal plate 6 contacts the fixed contact 5, the movable contact metal plate 6 and the bimetal 8 are not in contact with each other and are not energized. In a state in which the movable contact 7 is away from the fixed contact 5 and is in the off state, the bimetal 8 is energized through the bimetal 8 that contacts the movable contact metal plate 6 and the fixed contact metal plate 4 to generate heat, thereby heating the bimetal 8. As shown in FIG. 4, the heated bimetal 8 holds the movable contact 7 in an off state away from the fixed contact 5. Since the breaker 40 holds the movable contact 7 in the off state in the state where the breaker 40 is switched to the off state, the breaker 40 can be safely used for the battery pack. That is, the battery pack is used in an abnormal state and becomes higher than the set temperature, and after the breaker 40 is switched off, the heater 9 is energized from the battery pack battery and the bimetal 8 is heated. This is because the circuit breaker 40 can be maintained in a state of interrupting the current until the battery is discharged without returning to the on state.

  The bimetal 8 is formed by laminating metals having different coefficients of thermal expansion so as to be deformed by heating. The bimetal 8 is disposed between the heater 9 and the movable contact metal plate 6 and is deformed so as to be reversed by being heated, so that the movable contact 7 is separated from the fixed contact 5 and the breaker 40 is switched off. In the state where the bimetal 8 is curved in the center convex shape and is not thermally deformed, that is, in the state where the movable contact 7 is brought into contact with the fixed contact 5, the central protrusion is moved to the movable contact metal plate 6 as shown in FIG. In the state of projecting to the side and deforming so as to be reversed by thermal deformation, the center projecting portion is projected to the heater 9 side as shown in FIG. As shown in FIG. 4, the bimetal 8 is brought into contact with the heater 9 at the center protruding portion and in contact with the movable contact metal plate 6 in a state where the bimetal 8 is reversed by thermal deformation, and is pressed to contact the elastic contact portion 6A. To move the movable contact 7 away from the fixed contact 5 and switch it off.

  As shown in FIGS. 3 and 4, the movable contact metal plate 6 fixes the non-movable part 6B, which is an intermediate part, to the upper end surface of the second outer wall 11B, and the elastic arm part 6A on the distal end side is accommodated in the storage space 20. It is arranged inside. The movable contact metal plate 6 is fixed to the upper end surface of the second outer wall 11B by bonding the non-movable part 6B. Further, as shown in FIGS. 3, 4, and 7, the movable contact metal plate 6 has a non-movable portion 6B sandwiched between the second outer wall 11B and the resistance lead plate 3, so that the second outer wall 11B It is fixed to the top surface. The breaker 40 shown in the figure has one end portion of the resistance lead plate 3 laminated in contact with the non-movable portion 6B of the movable contact metal plate 6.

  The movable contact metal plate 6 is a metal plate that can elastically deform the elastic arm portion 6 </ b> A disposed in the storage space 20. Further, the movable contact metal plate 6 is provided with a movable contact 7 on the surface of the elastic arm 6 </ b> A that faces the fixed contact 5. The movable contact metal plate 6 is turned on when the movable contact 7 is in contact with the fixed contact 5 when the bimetal 8 is not thermally deformed, and is elastically pressed by the bimetal 8 when the bimetal 8 is thermally deformed. Is elastically deformed, and the movable contact 7 is separated from the fixed contact 5 and is turned off. The breaker 40 shown in FIGS. 3 and 4 is a pressing protrusion that presses the rear end of the elastic arm portion 6A downward so that the movable contact 7 can be surely brought into contact with the fixed contact 5 while the bimetal 8 is not thermally deformed. The portion 23 is provided so as to protrude from the inner surface of the resistance lead plate 3. The movable contact metal plate 6 is configured such that the distal end portion of the elastic arm portion 6A is pressed downward by the pressing convex portion 23, whereby the distal end portion of the elastic arm portion 6A is urged downward, and the movable contact 7 at the distal end is pressed. Is securely brought into contact with the fixed contact 5.

  Further, the movable contact metal plate 6 shown in FIGS. 3 to 5 is provided with a protruding portion 6C on the lower surface, and both ends of the bimetal 8 are brought into contact with the protruding portion 6C to press each other. The projecting portion 6C shown in the drawing has an arc shape, so that both end portions of the bimetal 8 can be reliably brought into contact with each other without being slid in the lateral direction and pressed together. The movable contact metal plate 6 shown in the figure has a plurality of protrusions 6 </ b> C on the lower surface facing both ends of the bimetal 8. In this structure, even the wide bimetal 8 can be brought into contact with each other and pressed together.

  Further, the breaker 40 shown in FIGS. 11 to 14 fixes the resistance lead plate 3 to the connecting plastic 52, fixes the connecting plastic 52 to the insulating case 2, and fixes the resistance lead plate 3 to the insulating case 2. . The resistance lead plate 3 is fixed to the connecting plastic 52 by insert molding. The resistance lead plate 3 to be insert-molded is temporarily fixed in a molding chamber of a mold for molding the connecting plastic 52, and molten plastic is injected into the molding chamber and fixed to the connecting plastic 52. The connecting plastic 52 is ultrasonically welded and fixed to the insulating case 2, and the insulating case 2 and the connecting plastic 52 constitute the outer case 1. However, the connecting plastic can be bonded or fixed to the insulating case with a fitting structure. The connecting plastic 52 is fixed to the first outer wall 11 </ b> A and the second outer wall 11 </ b> B provided at both ends of the insulating case 2 around the resistance lead plate 3 and further fixed to the opposing wall 12. The resistance lead plate 3 fixed to the insulating case 2 is laminated in contact with the non-movable portion 6B of the movable contact metal plate 6 and electrically connected to the movable contact metal plate 6.

  Further, the resistance lead plate 3 is provided with a connection terminal 53 for resistance welding a lead plate or the like connected to the outside. In the breaker 40 of FIGS. 11 and 12, one end of the resistance lead plate 3 protrudes outside the connecting plastic 52, and the protruding portion 3 </ b> X serves as a connection terminal 53. Further, in the breaker 40 of FIG. 14, a portion excluding the outer peripheral portion of the resistance lead plate 3 is exposed as an exposed terminal 43, and the exposed terminal 43 is used as a connection terminal 53.

  The resistance lead plate 3 and the connecting plastic 52 shown in FIGS. 11 to 14 have the same upper surface. In order to make the upper surface of the resistance lead plate 3 flush with the connecting plastic 52, a stepped portion 3a that is lowered is provided on the outer peripheral portion of the upper surface, and the connecting plastic 52 is formed on the stepped portion 3a. The breaker 40 can be welded by reliably contacting the leads with the exposed terminal 43 as the connection terminal 53. That is, the connecting plastic 52 protrudes, and the lead to be welded can be reliably and stably welded to the connection terminal 53 without being separated from the connection terminal 53 that is the exposed terminal 43.

  For example, the breaker is built in the battery pack, and when the battery or ambient temperature becomes high or the battery pack is used in an abnormal state, the breaker is deformed to interrupt the current. An example in which the above breaker 40 is built in a battery pack is shown below.

  The battery pack shown in FIGS. 15 to 22 is connected to the unit cell 30, the breaker 40 connected in series with the unit cell 30, the connection terminal 53 of the breaker 40, and the unit cell 30 via leads 36. Circuit board 35.

  The battery pack shown in FIGS. 15 to 22 includes a unit cell 30 of a square battery. In the unit cell 30, an opening of a metal outer can 31 is closed with a metal sealing plate 32, and an electrolytic solution and positive and negative electrodes are accommodated therein. The sealing plate 32 is laser welded to hermetically close the opening of the outer can 31. The sealing plate 32 has a convex electrode 33 at the center. The convex electrode 33 is insulated and fixed to the sealing plate 32. The unit cell 30 is a lithium ion battery. However, the unit cell may be any secondary battery such as a nickel metal hydride battery instead of the lithium ion battery. The lithium ion battery uses the convex electrode 33 as the negative electrode, the sealing plate 32 and the outer can 31 as the positive electrode, and the nickel metal hydride battery uses the convex electrode as the positive electrode and the sealing plate as the negative electrode.

  The battery pack has a breaker 40 connected in series with the unit cell 30. When the temperature of the unit cell 30 becomes higher than the set temperature, the breaker 40 is switched from the on state to the off state, and interrupts the current of the unit cell 30. Even in the state where an overcurrent flows, the current is switched to the off state and the current of the unit cell 30 is cut off. In the battery pack of FIGS. 15 to 22, a breaker 40 is connected between the convex electrode 33 of the unit cell 30 and the circuit board 35. The circuit board 35 is mounted with a circuit that realizes a protection circuit that prevents overcharging and overdischarging of the unit cell 30. The circuit board 35 is also provided with an output terminal (not shown) of the battery pack. The circuit board 35 is connected to the unit cell 30 via a lead 36 and a breaker 40. Here, in the battery pack shown in the drawing, the lead 36 is a lead plate, but the lead may be a lead wire.

  The breaker 40 is connected between the unit cell 30 and the circuit board 35. In the battery pack of FIG. 15, the breaker 40 shown in FIGS. 2 to 7 is connected between the unit cell 30 and the circuit board 35. In the illustrated breaker 40, connection terminals 53 and 54 are protruded at both ends, and are connected to the convex electrode 33 and the circuit board 35 of the unit cell 30 through the connection terminals 53 and 54. 15, the connection terminal 54 of the fixed contact metal plate 4 of the breaker 40 is connected to the convex electrode 33 of the unit cell 30, and the connection terminal 53 protruding from the resistance lead plate 3 is connected to the circuit board 35. ing. However, although not shown in the figure, the battery pack can be connected to the connection terminal of the fixed contact metal plate of the breaker to the circuit board, and the connection terminal protruding from the resistance lead plate can be connected to the convex electrode of the unit cell.

In the breaker 40 of FIG. 15, the connection terminal 53 protruding from the resistance lead plate 3 is connected to the circuit board 35 via the lead 36. In the drawing, the lead 36 connected to the connection terminal 53 of the breaker 40 is a lead plate, and is bent to an L-shape and bent in a horizontal direction to the connection terminal 53. doing. Further, the lead 36 is welded to the lead 36 soldered to the circuit board 35, and the breaker 40 is connected to the circuit board 35. Further, the breaker 40 connects the connection terminal 54 of the fixed contact metal plate 4 to the convex electrode 33 via the lead 37. The lead 37 shown in the figure is a lead plate, but can also be a lead wire. The lead 37 that connects the fixed contact metal plate 4 to the convex electrode 33 has one end welded to the fixed contact metal plate 4 and the other end welded to the convex electrode 33. Although not shown, the fixed contact metal plate can also be welded directly to the convex electrode with the connection terminal protruding long from the insulating case. Furthermore, the battery pack shown in the figure has an insulating layer 34 provided between the breaker 40 and the sealing plate 32, and the insulating layer 34 insulates the breaker 40 from the sealing plate 32.
Here, although not shown, the breaker 40 shown in FIGS. 11 to 13 has the same structure as described above, and can be connected between the unit cell and the circuit board to form a pack battery.

The above battery pack is assembled in the following steps.
(1) The bent piece 36A of the lead 36 which is an L-shaped lead plate is welded to the connection terminal 53 protruding from the resistance lead plate 3.
(2) The breaker 40 is disposed on the sealing plate 32 of the unit cell 30, and the connection terminal 54 of the fixed contact metal plate 4 is welded to the convex electrode 33 of the unit cell 30 directly or via the lead 37.
(3) The lead 36 connected to the circuit board 35 is welded to the lead 36 welded to the connection terminal 53 of the breaker 40 and the sealing plate 32 of the unit cell 30.

  The breaker 40 built in the battery pack shown in FIGS. 16 and 17 is the breaker 40 shown in FIG. 10 and has a connection terminal 53 as an exposed terminal 43 provided on the upper surface. The connection terminal 53 which is the exposed terminal 43 is provided on the exposed portion of the resistance lead plate 3. The resistance lead plate 3 is laminated in contact with the non-movable portion 6B of the movable contact metal plate 6 and fixed to the insulating case 2, and the outer surface is exposed to serve as an exposed terminal 43. In this battery pack, the connection terminal 54 of the fixed contact metal plate 4 of the breaker 40 is connected to the convex electrode 33 of the unit cell 30, and the connection terminal 53, which is the exposed terminal 43 provided on the upper surface, is connected to the circuit board 35. The lead 36 is connected. In the figure, the lead 36 connected to the circuit board 35 is a lead plate, and the bent piece 36A bent in an L shape and bent in the horizontal direction is the exposed terminal 43 of the breaker 40. The connection terminal 53 is welded and electrically connected. The lead 36 is soldered and connected to the circuit board 35.

The breaker 40 in FIGS. 16 and 17 connects the fixed contact metal plate 4 to the convex electrode 33 through a lead 37. The lead 37 shown in the figure is a lead plate, but can also be a lead wire. The lead 37 that connects the fixed contact metal plate 4 to the convex electrode 33 has one end welded to the fixed contact metal plate 4 and the other end welded to the convex electrode 33. Although not shown, the fixed contact metal plate can also be welded directly to the convex electrode with the connection terminal protruding long from the insulating case. Furthermore, the battery pack shown in the figure has an insulating layer 34 provided between the breaker 40 and the sealing plate 32, and the insulating layer 34 insulates the breaker 40 from the sealing plate 32.
Here, although not shown, the breaker 40 shown in FIG. 14 can also be connected to a unit cell and a circuit board to form a pack battery with the same structure as described above.

The above battery pack is assembled in the following steps.
(1) The connection terminal 54 of the fixed contact metal plate 4 is welded to the convex electrode 33 of the unit cell 30 directly or via the lead 37.
(2) The lead 36 connected to the circuit board 35 is welded to the sealing plate 32 of the unit cell 30 and the connection terminal 53 which is the exposed terminal 43 on the upper surface of the breaker 40.

  The battery pack of FIG. 18 is welded to the unit cell 30 by turning the breaker 40 of the battery pack of FIG. Therefore, this breaker 40 has the fixed contact metal plate 4 on the upper surface and the resistance lead plate 3 on the lower surface. The fixed contact metal plate 4 disposed on the upper surface is exposed on the upper surface of the breaker 40 with the portions other than both ends exposed to be exposed terminals 44, and the exposed terminals 44 serving as connection terminals 54. The connection terminal 54 which is the exposed terminal 44 is welded to a bent piece 36A of the lead 36 which is an L-shaped lead plate connected to the circuit board 35. Further, the breaker 40 projects the resistance lead plate 3 from the insulating case 2 to be a connection terminal 53, and this connection terminal 53 is connected to the convex electrode 33 of the unit cell 30. In the breaker 40 shown in the figure, the connection terminal 53 of the resistance lead plate 3 is connected to the convex electrode 33 via the lead 37. One end of the lead 37 is welded to the connection terminal 53 of the resistance lead plate 3, and the other end is welded to the convex electrode 33. However, the connection terminal of the resistance lead plate can be directly welded to the convex electrode. Furthermore, the battery pack shown in the figure has an insulating layer 34 provided between the breaker 40 and the sealing plate 32, and the insulating layer 34 insulates the breaker 40 from the sealing plate 32.

The above battery pack is assembled in the following steps.
(1) The connection terminal 53 of the resistance lead plate 3 is welded to the convex electrode 33 of the unit cell 30 directly or via the lead 37.
(2) The lead 36 connected to the circuit board 35 is welded to the sealing plate 32 of the unit cell 30 and the connection terminal 54 that is the exposed terminal 44 on the upper surface of the breaker 40.

  In the battery pack of FIG. 19, exposed terminals 43 and 44 are provided on both surfaces of the breaker 40, and the connection terminal 54 that is the exposed terminal 44 on the lower surface is connected to the convex electrode 33 of the unit cell 30. The terminal 53 is welded to a bent piece 36 </ b> A of a lead 36 that is an L-shaped lead plate connected to the circuit board 35. In this breaker 40, the resistance lead plate 3 is disposed on the upper surface, and the fixed contact metal plate 4 is disposed on the lower surface. The resistance lead plate 3 is laminated on and connected to the movable contact metal plate 6, and a portion excluding both ends is exposed as an exposed terminal 43, and the exposed terminal 43 is used as a connection terminal 53. The connection terminal 53 which is the exposed terminal 43 is connected by welding to a bent piece 36A of the lead 36 which is an L-shaped lead plate connected to the resistance lead plate 3. The fixed contact metal plate 4 on the lower surface is provided with an exposed terminal 44 exposed from the insulating case 2 as a connection terminal 54 on the lower surface, and the connection terminal 54 that is the exposed terminal 44 of the fixed contact metal plate 4 is a convex electrode of the unit cell 30. 33 is welded. In the battery pack having this structure, as shown in FIG. 20, the fixed contact metal plate 4 is protruded from the insulating case 2 to provide a protruding connection terminal 54 </ b> A, and the protruding connection terminal 54 </ b> A can be welded to the convex electrode 33. it can.

The battery pack of FIG. 19 is assembled in the following steps.
The lead 36 connected to the circuit board 35 is welded to the sealing plate 32 of the unit cell 30, the breaker 40 is mounted on the convex electrode 33 of the unit cell 30, and the connection terminal 54 that is the exposed terminal 44 of the breaker 40 is projected. The bent piece 36A of the lead 36 which is an L-shaped lead plate connected to the circuit board 35 is placed on the connection terminal 53 which is the exposed terminal 43 on the upper surface of the breaker 40, and placed on the partial electrode 33, and is welded. A current is passed through the bent piece 36A of the lead 36 → the resistance lead plate 3 → the breaker 40 → the fixed contact metal plate 4 → the convex electrode 33 and connected to the circuit board 35 to the connection terminal 53 which is the exposed terminal 43 on the upper surface. The connecting terminal 54 that is the exposed terminal 44 on the lower surface is welded to the convex electrode 33. In order to flow the welding current, the welding electrode is connected to the bent piece 36A of the lead 36 which is an L-shaped lead plate and the convex electrode 33 of the unit cell 30 or the sealing plate 32 of the unit cell 30.

  In the battery pack of FIG. 20, the protruding connection terminal 54A protruding from the lower surface of the insulating case 2 is welded to the convex electrode 33, the breaker 40 is fixed to the upper surface of the convex electrode 33, and then connected to the circuit board 35. The lead 36 is assembled by welding to the sealing plate 32 and the connection terminal 53 which is the exposed terminal 43 on the upper surface of the breaker 40.

  The battery pack of FIG. 21 is connected to the unit cell 30 by turning the breaker 40 built in the battery pack of FIG. In this breaker 40, the resistance lead plate 3 is disposed on the lower surface and the fixed contact metal plate 4 is disposed on the upper surface, and the exposed terminals 43 and 44 serving as connection terminals 53 and 54 on both the resistance lead plate 3 and the fixed contact metal plate 4, respectively. Is provided. The connection terminal 53 that is the exposed terminal 43 on the lower surface is an L-shaped lead plate that is connected to the convex electrode 33 of the unit cell 30, and the connection terminal 54 that is the exposed terminal 44 on the upper surface is connected to the circuit board 35. The lead 36 is welded to the bent piece 36A. In the breaker 40, the resistance lead plate 3 is laminated in contact with the non-movable portion 6B of the movable contact metal plate 6 and electrically connected thereto, and a part of the resistor lead plate 3 is exposed to expose the resistor lead plate 3 side. Is provided on the lower surface as the connection terminal 53. The fixed contact metal plate 4 is also exposed from the insulating case 2 and an exposed terminal 44 on the fixed contact 5 side is provided on the upper surface to serve as a connection terminal 54. The connection terminal 54 which is the exposed terminal 44 on the fixed contact 5 side is welded to the bent piece 36A of the lead 36 which is an L-shaped lead plate connected to the circuit board 35, and the exposed terminal on the resistance lead plate 3 side. The connection terminal 53, which is 43, is welded to the convex electrode 33 of the unit cell 30. As shown in FIG. 22, the battery pack having this structure can be provided with a protruding connection terminal 53 </ b> A by protruding the resistance lead plate 3 from the insulating case 2, and the protruding connection terminal 53 </ b> A can be welded to the convex electrode 33. .

The battery pack of FIG. 21 is assembled in the following steps.
The lead 36 connected to the circuit board 35 is welded to the sealing plate 32 of the unit cell 30, and the breaker 40 is placed on the convex electrode 33 of the unit cell 30, and the connection terminal 53 that is the exposed terminal 43 of the breaker 40 is projected. A bent piece 36A of a lead 36 which is an L-shaped lead plate connected to the circuit board 35 is placed on a connection terminal 54 which is an exposed terminal 44 on the upper surface of the breaker 40 and is placed on the partial electrode 33, and welded. An electric current is passed through the bent piece 36A of the lead 36 → the fixed contact metal plate 4 → the breaker 40 → the resistance lead plate 3 → the convex electrode 33 and connected to the circuit board 35 to the connection terminal 54 which is the exposed terminal 44 on the upper surface. The connecting terminal 53 that is the exposed terminal 43 on the lower surface is welded to the convex electrode 33. In order to flow the welding current, the welding electrode is connected to the bent piece 36A of the lead 36 which is an L-shaped lead plate and the convex electrode 33 of the unit cell 30 or the sealing plate 32 of the unit cell 30.

  The battery pack shown in FIG. 22 is connected to the circuit board 35 after the protruding connection terminal 53A protruding from the insulating case 2 is welded to the protruding electrode 33 and the breaker 40 is fixed to the upper surface of the protruding electrode 33. The lead 36 is assembled by welding to the sealing plate 32 and the connection terminal 54 which is the exposed terminal 44 on the upper surface of the breaker 40.

  In the battery pack manufacturing process described above, the breaker 40, the unit cell 30, and the lead 36 are connected by spot welding or laser welding.

DESCRIPTION OF SYMBOLS 1 ... Outer case 2 ... Insulation case 3 ... Resistance lead board 3a ... Step part
3X: Protruding part 4 ... Fixed contact metal plate 4A ... Tip
4B ... Intermediate part
4D: Stepped portion 5 ... Fixed contact 6 ... Movable contact metal plate 6A ... Elastic arm portion
6B ... Non-movable part
6C: Protruding portion 7 ... Movable contact 8 ... Bimetal 9 ... Heater 10 ... Outer peripheral wall 11 ... Outer wall 11A ... First outer wall
DESCRIPTION OF SYMBOLS 11B ... 2nd outer wall 12 ... Opposite wall 13 ... Bottom part 14 ... Protrusion part 15 ... Connection rib 16 ... Locking convex part 16A ... Inclined surface 17 ... Locking recessed part 20 ... Storage space 21 ... Storage recessed part 22 ... Bending side wall 23 ... Pressing convex portion 25 ... Through hole 26 ... Locking hole 27 ... Locking piece 30 ... Unit cell 31 ... Exterior can 32 ... Sealing plate 33 ... Convex electrode 34 ... Insulating layer 35 ... Circuit substrate 36 ... Lead 36A ... Bending Piece 37 ... Lead 40 ... Breaker 43 ... Exposed terminal 44 ... Exposed terminal 52 ... Connection plastic 53 ... Connection terminal 53A ... Projection connection terminal 54 ... Connection terminal 54A ... Projection connection terminal 104 ... Fixed contact metal plate 105 ... Fixed contact 106 ... Movable Contact metal plate 107 ... movable contact 108 ... bimetal 109 ... heater

Claims (7)

A fixed contact metal plate (4) having an outer case (1), a fixed contact (5) fixed to the outer case (1), and a fixed contact (5) of the fixed contact metal plate (4). A movable contact metal plate (6) having a movable contact (7) at a position where the movable contact (7) is movable, and a part of the movable contact metal plate (6) fixed to the outer case (1) so that the movable contact (7) can be moved. A bimetal (8) disposed between the plate (6) and the fixed contact metal plate (4) and switching the movable contact metal plate (6) from on to off, the movable contact metal plate (6) ) And the fixed contact metal plate (4) and a connection terminal (53; 54) formed by electrical connection,
A resistance lead plate (3) having a larger electrical resistance than the movable contact metal plate (6) is laminated on the movable contact metal plate (6) to electrically connect the laminated portion, and the resistance lead plate (3) Provided with a connection terminal (53) electrically connected to the movable contact metal plate (6) ,
The outer case (1) has an insulating case (2) in which the fixed contact metal plate (4) and the movable contact metal plate (6) are fixed, and a resistance lead fixed in the insulating case (2). A breaker comprising: a plate (3), wherein the resistance lead plate (3) closes the opening of the insulating case (2). A fixed contact metal plate (4) having an outer case (1), a fixed contact (5) fixed to the outer case (1), and a fixed contact (5) of the fixed contact metal plate (4). A movable contact metal plate (6) having a movable contact (7) at a position where the movable contact (7) is movable, and a part of the movable contact metal plate (6) fixed to the outer case (1) so that the movable contact (7) can be moved. A bimetal (8) disposed between the plate (6) and the fixed contact metal plate (4) and switching the movable contact metal plate (6) from on to off, the movable contact metal plate (6) ) And the fixed contact metal plate (4) and a connection terminal (53; 54) formed by electrical connection,
  A resistance lead plate (3) having a larger electrical resistance than the movable contact metal plate (6) is laminated on the movable contact metal plate (6) to electrically connect the laminated portion, and the resistance lead plate (3) Provided with a connection terminal (53) electrically connected to the movable contact metal plate (6),
  The outer case (1) includes an insulating case (2) and a resistance lead plate (3). The insulating case (2) includes a first outer wall (11A) and a second outer wall (11B). A storage space (20) is provided between the first outer wall (11A) and the second outer wall (11B). The storage space (20) includes the bimetal (8) and the The elastic arm portion (6A) of the movable contact metal plate (6) is accommodated, the fixed contact metal plate (4) is fixed to the first outer wall (11A), and the second outer wall (11B) is fixed. The non-movable part (6B) of the movable contact metal plate (6) is fixed,
  Further, the resistance lead plate (3) is fixed to the insulating case (2) and closes the opening of the storage space (20),
  The resistance lead plate (3) is laminated in contact with the non-movable part (6B) of the movable contact metal plate (6) and fixed to the insulating case (2), and the resistance lead plate (3) Breaker provided on the upper surface of the outer case (1) with the exposed terminal (43) exposing the outer surface as a connection terminal (53).   The breaker according to claim 1 or 2, wherein a heater (9) is disposed between the bimetal (8) and the fixed contact metal plate (4).   The movable contact metal plate (6) and the resistance lead plate (3) are phosphor bronze, and the movable contact metal plate (6) is phosphor bronze having a higher copper content than the resistance lead plate (3). Breaker described in any one of.   The breaker according to any one of claims 1 to 3, wherein the movable contact metal plate (6) is phosphor bronze, and the resistance lead plate (3) is a metal plate of nickel or a nickel alloy. The breaker according to any one of claims 1 to 5 , wherein the fixed contact metal plate (4) has a connection terminal (54) protruding to the outside of the exterior case (1). The breaker according to any one of claims 1 to 5 , wherein the fixed contact metal plate (4) is provided with a connection terminal (54) of an exposed terminal (44) exposed on a surface of the exterior case (1) on a bottom surface. .

Images