JP2008053128A - Secondary battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the sureness of interlock in a secondary battery pack. <P>SOLUTION: The secondary battery pack 11 comprises a secondary battery body, a body case 13 to which the secondary battery body is attached, a lid 15 mounted on the case 13, and a breaker 19 that is an internal connection breaker for electrically connecting and interrupting the secondary battery body to and from a connector. When the lid 15 is opened, a projection 31 mounted on the lid 15 moves upward with the lid 15 and engagement of the projection 31 of the lid 15 with a boss 25b of a lock pin 25a is released. The tip of the rock pin 25a is protruded to a position B by a spring 25d to thereby disable switching of a knob 20 of the breaker 19 from an interruption position to a connection position. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a structure of a secondary battery pack for driving a vehicle.

  2. Description of the Related Art A large-capacity vehicle driving secondary battery that can be charged / discharged is mounted on a vehicle such as an electric vehicle or a hybrid vehicle that is driven by a motor. Such a secondary battery for driving a vehicle obtains a high voltage by connecting a large number of lead storage batteries, nickel metal hydride batteries, lithium ion batteries and the like in series.

  Generally, a plurality of (for example, six) battery cells (for example, six battery cells having an output voltage of 1.2 V) are connected to the vehicle driving secondary battery so that a necessary power capacity (voltage value) is obtained. Many collective secondary batteries (battery modules) that are integrally connected are employed. A predetermined number of such battery modules are further connected in series to form a vehicle drive secondary battery having a high voltage output of 200V to 300V.

  Such a secondary battery is incorporated in a secondary battery pack together with the main body of the secondary battery and other accessory parts and is mounted on a vehicle. Since the secondary battery is a very high voltage battery, a safety device has been proposed that prevents the secondary battery pack from being inadvertently opened when it is removed from the vehicle during assembly or maintenance.

  In Patent Document 1, when a safety plug is attached to a safety plug mounting portion to which a power line (for example, a bus bar or a power supply line) for receiving power in the secondary battery is wired, the power of the secondary battery is disclosed. When the safety plug is removed and the safety plug is removed, the power supply of the secondary battery is cut off. An interlock device is disclosed in which when the safety plug is attached to the safety plug mounting portion, the lid is closed and locked by the safety plug and the secondary battery is not opened.

  In Patent Document 2, the conductor part attached to the protective cover electrically connects the battery electrode and the external device when attached, and when the protective cover is removed, the conductor part is also removed together with the protective cover. Disclosed is a battery that can break an electrical connection between the device and an external device.

JP 2002-175791 A JP-A-4-324244

  When the secondary battery pack is removed from the vehicle for disassembly and inspection, the cover may be removed. The prior art described in the above Patent Documents 1 and 2 is designed to be interlocked by removing the safety plug or the protective cover, but the interlock directly interlocked with the opening and closing of the cover of the secondary battery. Therefore, there is a problem that the interlock may not be applied when the cover of the secondary battery is opened.

  Therefore, an object of the present invention is to improve the reliability of the interlock of the secondary battery pack.

  A secondary battery pack according to the present invention includes a secondary battery body for driving a vehicle, a body case to which the secondary battery body is attached, a lid attached to the body case, and a secondary battery attached to the body case. A secondary battery comprising: a pack power supply / reception port; and an internal connection breaker that is attached in the main body case and electrically connects and disconnects between the secondary battery main body and the secondary battery pack power supply / reception port. It is a pack, and has a blocking position holding mechanism that is attached in the main body case and mechanically holds the internal connection circuit breaker in a blocking position in conjunction with opening of the lid.

  The breaking position holding mechanism is mechanically cut off from the internal connection breaker by being biased by a spring from a first position where the internal connection breaker can be freely connected and disconnected in the main body case. A projecting piece that advances to a second position that is held in a state; and provided on the lid, and the lid is attached to the main body case, the projecting piece is engaged with the projecting piece and the first projecting piece is moved to the first position. The projection is held in position and disengaged from the projecting piece when the lid is opened, so that the projecting piece can advance to the second position. The internal connection circuit breaker includes a connection port of a connection device for electrically blocking or connecting between the secondary battery main body and the secondary battery pack power supply / reception port, and the blocking position holding mechanism opens the lid Interlocking with the shielding plate that mechanically shields the connection port It is shielding plate position retaining mechanism for holding the position, also to be suitable as the blocking position retaining mechanism is also suitable as it is composed of a plurality of link mechanisms.

  The present invention has an effect that the reliability of the interlock of the secondary battery pack can be improved.

  Hereinafter, a preferred embodiment of a secondary battery pack according to the present invention will be described with reference to the drawings. However, the following description is an example and may have other structures.

  FIG. 1 is a perspective view showing a secondary battery pack 11 according to an embodiment of the present invention. The secondary battery pack 11 of this embodiment has a structure in which a main body case 13 is covered with a lid 15 and integrated. A secondary battery main body 17 is attached to the main body case 13, and an electric circuit board 14 containing an electric circuit for the secondary battery is attached to one end side. A fixed board (not shown) is attached to the upper part of the space on one end side of the electric circuit board 14 and the main body case 13, and a rotary switch 21 that cuts off and cuts off power supply to the secondary battery is attached to the fixed board. . A breaker 19 is attached to the electric circuit board 14, and a service plug main body 23 a is attached to the lower part of the main body case 13. The service plug body 23a cuts off or connects the electrical circuit inside the secondary battery body 17 by inserting / removing the connection plug 23b, which is a connector for electrical connection of the secondary battery pack 11, to the insertion port 23c. ing.

  In the present embodiment, a breaker cutoff position holding mechanism 25 is attached in the vicinity of the breaker 19, and a protrusion 31 is attached to the inside of the lid facing the breaker cutoff position holding mechanism 25, so that the lid 15 is opened from the main body case 13. Then, the breaker 19 can be held in the blocking position.

  A rotation switch hole 33 through which the rotation knob 21a of the rotary switch 21 passes is provided on the upper surface of the lid, and the connection plug 23b is inserted into the insertion port 23c by opening the insertion port 23c of the service plug body 23a at one end of the lid. A notch 34 is provided for insertion. A breaker operation hole 36 for turning on and off the knob 20 of the breaker 19 is attached to the side surface of the lid 15.

  FIG. 2 is a diagram showing a schematic system inside the secondary battery pack. As shown in this figure, the connection disconnection device for connecting and disconnecting the electric circuit such as the rotary switch 21, the breaker 19, and the service plug main body 23a is connected to an intermediate position where a plurality of battery modules are connected in series, and electrically It is provided at the center of the secondary battery body 17. The service plug main body 23a is configured to cut off or connect an electric circuit inside the secondary battery by inserting / removing the connection plug 23b. The connector 24a, which is a power supply / reception port for outputting the electrical output from the secondary battery pack to an external device, is connected to both ends of the secondary battery body 17, and is configured so that the entire voltage of the secondary battery body 17 is applied. Yes. The connector 24a is connected to the connector 24b on the external device side so as to be connected to the secondary battery and the inverter device 41 or the motor generator 43 of the external device.

  The configuration and operation of the breaker cutoff position holding mechanism 25 will be described with reference to FIG. In the figure, a dotted line shows a state where the lid 15 is attached to the main body case 13. The breaker cutoff position holding mechanism 25 is held in a hole opened in the electric circuit board 14 and the partition plate 16, and can be moved back and forth in the axial direction, a flange 25c fixed to the lock pin 25a, A spring 25d is provided between the partition plate 16 and pushes the lock pin 25a from the partition plate side to the electric circuit board side. Further, a boss 25b protrudes laterally from the side surface between the electric circuit board 14 and the partition plate 16 of the lock pin 25a.

  A breaker 19 fixed to the electric circuit board 14 is provided with a knob 20 for cutting off the connection of the breaker 19. As shown by the solid line in FIG. 3, the knob 20 is located on the blocking side at a position farther from the lock pin 25a, and the side closer to the lock pin 25a is the connection side as shown by the dotted line in FIG. A protrusion for operating the knob 20 from the breaker operation hole 36 is attached to the tip of the knob 20.

  As shown in FIG. 3, when the lid 15 is closed, the protrusion 31 attached to the lid 15 engages with the boss 25b of the lock pin 25a so that the tip position of the lock pin 25a is at the first position. It is pushed to a certain A position. In this state, since the lock pin 25a does not restrict the operation of the knob 20 of the breaker 19, the knob 20 of the breaker 19 can be switched from the outside of the secondary battery pack 11 to the connection position and the cutoff position through the breaker operation hole 36. it can.

  In order to open the secondary battery pack, the knob 20 of the breaker 19 is switched to the cut-off position to electrically cut off the connection of the secondary battery body 17 and open the lid 15. When the lid 15 is opened, the protrusion 31 attached to the lid 15 moves upward together with the lid. As a result, the protrusion 31 of the lid 15 and the boss 25b of the lock pin 25a are disengaged. Then, the tip of the lock pin 25a is pushed out by the spring 25d and protrudes to the position B which is the second position. When the tip of the lock pin 25a comes to the position B, which is the second position, the knob 20 of the breaker 19 cannot be switched from the blocking position to the connection position because of the lock pin 25a. The tip position B of the lock pin 25a is held by a spring 25d. Accordingly, the knob 20 of the breaker 19 can be held at the shut-off position in conjunction with the opening of the lid 15 so as not to reach the connection position. Even when the lid 15 is opened, the secondary battery An interlock can be applied so that the main body 17 cannot be energized. As a result, the reliability of the interlock of the secondary battery pack 11 can be improved.

  In the embodiment described above, the cover 15 is opened after the knob 20 of the breaker 19 is set to the shut-off position before the cover 15 is opened. However, the cover 15 is opened with the breaker 19 remaining in the connection position. Even in this case, the knob 20 of the breaker 19 can be moved to the blocking position by the pop-out of the lock pin 25a, and can be held at the blocking position. This also brings about an effect that the interlock of the secondary battery pack 11 can be ensured.

  The above-described breaker cutoff position holding mechanism 25 causes the lock pin 25a to pop out by the spring 25d and holds the knob 20 of the breaker 19 in the cutoff position. If it can be held in the blocking position, the blocking plate may be popped out by the spring 25d, or the holding member that holds the knob 20 in the blocking position may be rotated horizontally to project to the connection position of the knob 20. Other mechanisms may be used, and the knob 20 of the breaker 19 may be held in the blocking position by combining a link mechanism including a plurality of elements and the spring 25d.

  Hereinafter, the second embodiment will be described with reference to FIGS. 4 and 5. The same parts as those described in the previous embodiment are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 4, in this embodiment, a rotary switch cutoff position holding mechanism 27 is attached in the vicinity of the rotary switch 21 of the main body case 13, and the inside of the lid facing the rotary switch cutoff position holding mechanism 27. Is provided with a projection 35 so that the rotary switch 21 can be held in the blocking position when the lid 15 is opened from the main body case 13.

  The configuration and operation of the rotary switch cutoff position holding mechanism 27 will be described with reference to FIG. FIG. 5A shows a partial cross section of the secondary battery pack 11 including the rotary switch cutoff position holding mechanism 27, and FIG. 5B shows a partial plane of the rotary switch cutoff position holding mechanism 27. In the figure, a dotted line shows a state where the lid 15 is attached to the main body case 13. As shown in FIG. 2, the rotary switch 21 is electrically attached to an intermediate position of the secondary battery body 17 to electrically connect or disconnect between the two bus bars 21 d connected to the secondary battery. It is a change-over switch. As shown in FIG. 5A, the rotary switch 21 is rotatably attached to a fixed substrate 18 attached to a space between the electric circuit board 14 attached to the main body case 13 and the main body case 13. . A rotation knob 21 a is attached to the outer surface side of the main body case of the fixed substrate 18. The rotary knob 21a is provided with a knob for rotating the rotary knob 21a when the substrate on the disk is rotated. A shaft 21b fixed to the rotary knob 21a and rotatably attached to the fixed substrate 18 is fixed to the inner surface of the main body case of the fixed substrate 18 of the rotary knob 21a. A rotating disk 21c that rotates in conjunction with the rotating operation of the rotating knob 21a is fixed. An electrical connection portion 21e is attached to the rotating disk 21c to contact the two bus bars 21d and electrically connect the two bus bars 21d. When the rotary knob 21a is rotated, the shaft 21b and the rotating disc 21c rotate in conjunction with the rotating operation, and when the electrical connection portion 21e comes into contact with the two bus bars 21d simultaneously, the secondary battery body 17 is electrically connected. When the rotary knob 21a is rotated 90 degrees, the position of the electrical connection portion 21e is shifted from the position of the two bus bars 21d, and the electrical connection between the two bus bars 21d is cut off. . And as shown in FIG.5 (b), the notch 21f in which the front-end | tip part of the lock arm 27a fits in a part of rotation disc 21c is provided.

  The lid 15 is provided with a rotation switch hole 33 through which the rotary knob 21 a of the rotary switch 21 can protrude, and the rotary knob 21 a of the rotary switch 21 is rotated with the lid 15 attached to the main body case 13. It is possible to switch connection blocking.

  On the other hand, a rotary switch cutoff position holding mechanism 27 is attached to the main body case 13 in the vicinity of the rotary disk 21 c of the rotary switch 21. The rotary switch cut-off position holding mechanism 27 includes a bracket 27b fixed to the main body case 13, a lock arm that is rotatably held by the bracket 27b by a pin 27c, and has a distal end fitted into the notch 21f of the rotary disc 21c. 27a is attached. A bracket 27e is fixed to the main body case 13, and a spring 27d is attached between the bracket 27e and the rear end of the lock arm 27a to give a pressing force to the rear end of the lock arm 27a. When the spring 27d pushes down the rear end portion of the lock arm 27a, the tip end portion of the lock arm 27a rises and fits into the notch 21f of the rotating disk.

  A protrusion 31 is attached to the inner surface of the lid 15. The protrusion 31 is in a position where the tip of the projection 15 pushes down the portion between the tip of the lock arm 27 a and the pin 27 c in a state where the lid 15 is attached to the body case 13, and the length of the projection 31 is attached to the body case 13. In this state, the tip of the lock arm 27a has a length that can push down the tip of the lock arm 27a to a position where it does not engage with the notch 21f of the rotary disk 21c.

  The operation of the rotary switch cutoff position holding mechanism 27 configured as described above will be described. When the lid 15 is attached to the main body case 13, as described above, the tip of the projection 31 fixed to the lid 15 pushes down the intermediate portion between the tip of the lock arm 27a and the pin 27c, and the lock arm 27a The tip end portion is a first position where it does not engage with the notch 21f of the rotating disk 21c. In this state, the rotary knob 21a of the rotary switch 21 can be freely rotated manually so that the connection state and the cutoff state can be switched.

  In order to disassemble and inspect the secondary battery pack 11, the rotary knob 21a of the rotary switch 21 is rotated so that the electrical connection of the secondary battery body 17 is cut off. Then, as shown in FIG. 5B, the rotary disk 21c rotates in conjunction with the operation of the rotary knob 21a, and the position of the notch 21f rotates to the position of the tip of the lock arm 21a. When the lid 15 is released from the main body case 13 in this state, the protrusion 31 fixed to the inside of the lid 15 moves upward together with the lid 15. Then, the tip position of the protrusion 31 also rises from a position where the tip portion of the lock arm 27a does not engage with the notch 21f of the rotating disk 21c. The leading end portion of the lock arm 27a is raised by being pushed down by the spring 27d at the rear end portion of the lock arm 27a and is fitted into the notch 21f. When the lid 15 is completely opened from the main body case 13, the protrusion 31 is also completely separated from the lock arm 27a, and the tip of the lock arm 27a is in the second position where it engages with the notch 21f of the rotating disk 21c. When the leading end of the lock arm 27a is raised to the second position where it engages with the notch 21f, the rotating disk 21c cannot rotate, and the position of the electrical connecting portion 21e is blocked by 90 degrees from the position of the bus bar 21d. Held in position.

  In this way, in conjunction with the opening operation of the lid 15 from the main body case 13, the rotary disk 21c of the rotary switch 21 is held at the blocking position by the tip of the lock arm 27a and does not come to the connection position. Even when the lid 15 is opened, an interlock can be applied so that the secondary battery body 17 cannot be energized. As a result, the reliability of the interlock of the secondary battery pack 11 can be improved.

In the above-described embodiment, the tip end portion of the lock arm 27a rises to the second position where it fits into the notch 21f of the rotating disc 21c, whereby the electrical connection portion 21e of the rotating disc 21c is held at the blocking position. Although described as a structure, a protrusion is provided on the rotating disk 21c, and the lock arm 27a is raised to the second position, and engages with the protrusion to engage the electric connecting part 21e of the rotating disk.
It is good also as hold | maintaining so that it may be in the interruption | blocking state. The spring 27d has been described as moving the lower end of the lock arm 27a downward to raise the tip of the lock arm 27a to the second position. However, the position of the bracket 27e relative to the pin 27c is described. The tip of the lock arm 27a may be provided on the side opposite to the tip of the lock arm 27a, and the spring 27d may be operated to pull down the rear end of the lock arm 27a to raise the tip of the lock arm 27a to the second position. The first position of the tip of the lock arm 27a is the fixed substrate 18 side of the rotating disk 21c, and the position of the projection 31 along the lock arm 27a is between the pin 27c and the rear end of the lock arm 27a. When the lid 15 is opened, the projection 31 is disengaged, and the tip of the lock arm 27a is lowered by its own weight without using the spring 27d, thereby engaging with the notch 21f or the projection of the rotating disk 21c. You may comprise.

  Hereinafter, the third embodiment will be described with reference to FIGS. 6 and 7. The same parts as those described in the previous embodiment are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 6, in this embodiment, a service plug shielding plate holding mechanism 29 is attached in the vicinity of the service plug main body 23a, and the lid 15 comes near the service plug shielding plate holding mechanism 29 when the lid is closed. A protrusion 37 is attached.

  The configuration and operation of the service plug shielding plate holding mechanism 29 will be described with reference to FIG. In the figure, a dotted line shows a state where the lid 15 is attached to the main body case 13. The service plug main body 23a is fixed to the lower part of the main body case 13, and the internal electric circuit of the secondary battery is cut off or connected by inserting / removing the connection plug 23b into / from the insertion port 23c. As shown in FIG. 7, the service plug shielding plate holding mechanism 29 includes a shielding plate 29 a that shields the insertion port 23 c of the service plug main body 23 a so that the connection plug 23 b cannot be connected, and the main body case 13. The bracket 29b is rotatably fixed to the bracket 29b by a pin 29c, and the spring 29d is attached to the arm portion 29e of the shield plate 29a. The spring 29d pushes up the arm portion 29e of the shielding plate 29a to the upper surface side of the main body case.

  A protrusion 37 is fixed to the lid 15. The projection 37 is between the end of the arm portion 29e of the shielding plate 29a and the pin 29c, and is attached to the inner surface of the service plug body 23a and the shielding plate 29a.

  The operation of the service plug shielding plate holding mechanism 29 configured as described above will be described. In a state where the lid 15 is attached to the main body case 13, the lower end of the projection 37 abuts on the upper surface between the end of the arm portion 29e of the shielding plate 29a and the pin 29c, and the tip of the shielding plate 29a is attached to the spring 29d. The arm portion 29e is pushed downward against the pushing force of the arm portion 29e. In this state, the position of the shielding plate 29a is an open position where the connection plug 23b can be inserted from the service plug cutout 34 into the insertion port 23c of the service plug main body 23a as shown by the dotted line in FIG.

  In the inspection of the secondary battery pack 11, after the secondary battery pack 11 is cut off by the rotary switch 21, the external device side connector 24b shown in FIG. 2 is removed from the secondary battery pack 11 side connector 24a. The next battery pack 11 is removed from the vehicle. Thereafter, the lid 15 is released from the body case 13 for internal inspection, and when the lid 15 is lifted above the body case 13, the protrusion 37 fixed to the lid 15 also moves upward together with the lid 15. Then, the arm 29e of the shielding plate 29a is pushed upward by the pushing force of the spring 29d, and the shielding plate 29a on the opposite side of the spring 29d and the pin 29c is lowered downward. When the lid 15 is completely opened, the shielding plate 29a is pressed against the second position on the lower surface of the main body case 13 by the pushing force of the spring 29d, and the insertion port 23c of the service plug main body 23a is pushed by the shielding plate 29a. Shielded. The shielding plate 29a is held at the shielding position by the pushing force of the spring 29d.

  Accordingly, the insertion port 23c of the service plug body 23a is shielded by the shielding plate 29a in conjunction with the opening of the lid 15, and even when the lid 15 is opened, the connection plug 23b is inserted into the insertion port 23c of the service plug body 23a. An interlock can be applied so that the electrical circuit inside the secondary battery pack 11 cannot be connected by being inserted. As a result, the reliability of the interlock of the secondary battery pack 11 can be improved.

  In the above embodiment, the arm 29e of the shielding plate 29a is pushed up by the spring 29d, and the shielding plate 29a is held in the shielding position. However, the shielding plate 29a, the arm 29e, the pin 29c, and the bracket 29b are described. Depending on the positional relationship, the shield plate 29a may be held at the shield position by the pulling force of the spring 29d.

1 is a perspective view of a secondary battery pack according to an embodiment of the present invention. It is a schematic wiring diagram in the secondary battery pack of embodiment which concerns on this invention. In the secondary battery pack of embodiment which concerns on this invention, it is explanatory drawing which shows operation | movement with the breaker interruption | blocking position holding mechanism attached to the main body case, and the protrusion attached to the lid | cover. It is a perspective view of the secondary battery pack according to the second embodiment of the present invention. In the secondary battery pack of 2nd Embodiment which concerns on this invention, it is explanatory drawing which shows operation | movement with the rotary switch interruption | blocking position holding mechanism attached to the main body case, and the protrusion attached to the lid | cover. It is a perspective view of the secondary battery pack according to the third embodiment of the present invention. In the secondary battery pack of 3rd Embodiment which concerns on this invention, it is explanatory drawing which shows operation | movement with the shielding plate which shields the insertion port of the service pack main body attached to the main body case, and the protrusion attached to the lid | cover. .

Explanation of symbols

  11 Secondary battery pack, 13 Main body case, 14 Electric circuit board, 15 Lid, 16 Partition plate, 17 Secondary battery main body, 18 Fixed board, 19 Breaker, 20 Knob, 21 Rotary switch, 21a Rotary knob, 21b Shaft, 21c Rotating disc, 21d Bus bar, 21e Electrical connection part, 21f Notch, 23a Service plug body, 23b Connection plug, 23c Insert, 24a, 24b Connector, 25 Breaker cutoff position holding mechanism, 25a Lock pin, 25b Boss, 25c flange, 25d spring, 27 rotary switch blocking position holding mechanism, 27a lock arm, 27b, 27e, 29b bracket, 27c, 29c pin, 27d, 29d spring, 29 service plug shielding plate holding mechanism, 29a shielding plate, 29e arm , 31,35,37 protrusion 33 rotary switch hole, cutout which for 34 service plug 36 breaker operation hole.

Claims (4)

A secondary battery body for driving the vehicle;
A body case to which the secondary battery body is attached;
A lid attached to the body case;
A secondary battery pack power supply / reception port attached to the main body case;
An internal connection circuit breaker that is attached in the main body case and electrically connects and disconnects between the secondary battery main body and the secondary battery pack power supply / reception port,
A blocking position holding mechanism attached in the main body case and mechanically holding the internal connection breaker in a blocking position in conjunction with opening of the lid;
A secondary battery pack comprising: The secondary battery pack according to claim 1,
The breaking position holding mechanism is urged by a spring from a first position where the internal connection breaker can freely connect and break in the main body case to mechanically break the internal connection breaker. A projecting piece that advances to the second position to be held;
When the lid is provided on the lid and attached to the main body case, the projection is engaged with the projection piece to hold the projection piece in the first position, and the projection is opened when the lid is opened. A protrusion that disengages from the piece and allows the protruding piece to advance to the second position;
A secondary battery pack comprising: The secondary battery pack according to claim 1,
The internal connection breaker includes a connection port of a connector for electrically blocking or connecting between the secondary battery main body and the secondary battery pack power supply / reception port,
The blocking position holding mechanism is a shielding plate position holding mechanism that holds a shielding plate that mechanically shields the connection port in the shielding position in conjunction with opening of the lid;
Secondary battery pack characterized by this. The secondary battery pack according to any one of claims 1 to 3,
The secondary battery pack, wherein the shut-off position holding mechanism includes a plurality of link mechanisms.

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