JP2013191355A - Secondary battery cell, power supply device, and vehicle and power storage device incorporating power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a secondary battery to be safely destroyed even after a current breaking mechanism was actuated.SOLUTION: The secondary battery comprises: an outer can 2; an internal electrode 28 housed in the outer can 2; a pair of electrode terminals 5 electrically connected with the internal electrodes 28; a current breaking mechanism interposed between electrical connections between the electrode terminal 5 on one side of the pair of electrode terminals 5 and the internal electrodes 28, which is actuated when the internal pressure of the outer can 2 rises above a designated value to beak the electrical connections; an auxiliary terminal 50 used for connection with a discharge path provided to discharge the residual electrical charges retained in the internal electrodes 28; and a movable terminal 52, electrically connected with the internal electrodes 28 and fixed in correlation with the current breaking mechanism, which, while the current breaking mechanism remains inactive, is apart from the auxiliary terminal 50, and is contacted with the auxiliary terminal 50 simultaneously with actuation of the current breaking mechanism to establish electrical continuity between the auxiliary terminal 50 and the internal electrodes 28.

Description

  The present invention relates to a secondary battery cell, a power supply device in which a plurality of the secondary battery cells are stacked, a vehicle including the power supply device, and a power storage device, and particularly to an electric vehicle such as a hybrid vehicle, a fuel cell vehicle, an electric vehicle, and an electric motorcycle. The present invention relates to a power supply device for a motor that is mounted and travels a vehicle, or a power supply device that supplies power to a power source for large current used for household or factory power storage applications, a vehicle including the power supply device, and a power storage device.

  In order to increase the power supplied to the motor that drives the vehicle, the power supply device for the vehicle increases the output voltage of the battery block by connecting a large number of rechargeable secondary battery cells in series as a battery block. . This power supply device is discharged by supplying electric power to the motor while the vehicle is running, and is charged by a generator during regenerative braking of the vehicle. The discharge current of the battery specifies the driving torque of the motor, and the charging current of the battery specifies the braking force for regenerative braking. Therefore, in order to increase the driving torque of the motor that accelerates the vehicle, it is necessary to increase the discharge current of the battery, and it is necessary to charge with a large current in order to increase the regenerative braking of the vehicle. From this, the battery of the power supply device for vehicles is discharged and charged with a large current. In order to charge and discharge the battery with a large current and improve safety, a mechanism that interrupts the current when the internal pressure of the battery becomes abnormally high, that is, a current interrupt device (hereinafter referred to as “CID”) is built-in. A battery has been developed (see Patent Document 1).

  As shown in FIG. 19, the CID is arranged between the internal electrode 228 and the electrode terminal 205 inside the secondary battery cell 201. When the CID 230 is normal, the internal electrode 228 and the electrode terminal 205 are electrically connected as shown in FIG. On the other hand, when the internal pressure of the secondary battery cell 201 rises abnormally due to rapid charging with a large current or the like, as shown in FIG. 21, the circuit is physically deformed to interrupt the circuit, and the current supply is stopped.

JP 2010-157451 A

  The secondary battery cell and power supply device provided with the CID are high in safety as described above, but once the CID is activated, the output path of the secondary battery cell is physically cut off. The charge cannot be taken out. Therefore, if a charge remains in the secondary battery cell during the operation of the CID, the battery is not discharged after the operation, and the capacity is maintained while remaining. In particular, when the CID is activated due to overcharge, a relatively large charge remains.

  On the other hand, when discarding the secondary battery cell or the power supply device, it is desirable to eliminate the remaining capacity in order to prevent an unintended short circuit between the terminals of the secondary battery cell after disposal. However, as described above, the secondary battery cell provided with the CID may remain in a state where electric charges remain. In such a case, if conduction occurs for some reason, an unintended short circuit may occur. was there.

  The present invention has been made in view of such conventional problems. A main object of the present invention is to provide a secondary battery cell, a power supply device, a vehicle including the power supply device, and a power storage device that can reduce the remaining capacity even after the current interrupting mechanism is activated and can make the battery safe. To provide an apparatus.

Means for Solving the Problems and Effects of the Invention

  To achieve the above object, the secondary battery cell according to the first aspect of the present invention is electrically connected to an outer can, an internal electrode housed in the outer can, and the internal electrode. A pair of electrode terminals and one electrode terminal of the pair of electrode terminals are interposed between the electrical connection with the internal electrode, and the electrical connection between the electrode terminal and the internal electrode can be cut off. A secondary battery cell including an auxiliary terminal for discharging an electric charge held in the internal electrode, and a space between the auxiliary terminal and the auxiliary terminal. In addition, there can be provided a moving terminal that is displaced in correlation with the current interrupt mechanism and that makes the auxiliary terminal and the internal electrode conductive when in contact with the auxiliary terminal when the current interrupt mechanism is activated. With the above configuration, when the current interruption mechanism operates due to an increase in internal pressure, the secondary battery cell can be connected to the discharge path in conjunction with the operation of the current interruption mechanism, so the secondary battery cell can be connected via this discharge path. It is possible to discharge safely and avoid problems caused by remaining capacity.

  Moreover, according to the secondary battery cell which concerns on a 2nd side surface, the said auxiliary terminal can be exposed to the exterior of the said exterior can. With the above configuration, the auxiliary terminal can be connected to an external discharge path and easily discharged.

  Furthermore, according to the secondary battery cell which concerns on a 3rd side surface, the said electric current interruption mechanism has a deformed metal which deform | transforms according to the pressure in the said exterior can, The said deformed metal presses the said movement terminal. The moving terminal is urged in a direction close to the auxiliary terminal and electrically connected to the internal electrode through the moving terminal, and the deformed metal is deformed to deform the electrode terminal and the The electrical connection with the internal electrode can be cut off. With the above configuration, the current interruption mechanism separates the moving terminal from the auxiliary terminal against the biasing force, and when the current interruption mechanism is activated, the moving state is smoothly brought into contact with the auxiliary terminal by releasing the pressing state. It becomes possible.

  Furthermore, according to the secondary battery cell according to the fourth aspect, the outer can, the internal electrode housed in the outer can, the sealing plate for closing the upper surface of the outer can, the internal electrode and the electrical A pair of electrode terminals provided on the sealing plate, and interposed between electrical connections of one of the pair of electrode terminals and an internal electrode, and the outer can A current interruption mechanism that operates when the internal pressure of the battery rises above a specified value and interrupts the electrical connection, and the outer can is electrically connected to any one of the pair of electrode terminals. A secondary battery cell connected to the internal electrode; and a discharge lead plate electrically connected to the internal electrode; and when the residual charge held in the internal electrode is forcibly discharged, Press the surface to force the outer can and the discharge lead plate , A forced discharge mechanism for through may comprise a. With the above configuration, when the secondary battery cell is to be discharged, such as when the secondary battery cell is discarded, it is forced to discharge through the outer can by conducting the discharge lead plate and the internal electrode with a forced discharge mechanism. The remaining capacity can be discharged even after the current interruption mechanism or the like is activated.

  Furthermore, according to the secondary battery cell according to the fifth aspect, the discharge lead plate extends in a direction parallel to the sealing plate inside the outer can to a position corresponding to the forced discharge mechanism. Can be made. According to the above configuration, the forced discharge mechanism can be pressed and the internal electrode located below can be easily conducted.

  Furthermore, according to the secondary battery cell which concerns on a 6th side surface, the said discharge lead plate can be extended from the contact of the said electric current interruption mechanism. With the above configuration, the contact of the current interrupt mechanism and the contact for forced discharge can be made common, and the additional cost when adding the forced discharge function can be reduced.

  Furthermore, according to the secondary battery cell according to the seventh aspect, the secondary battery cell further includes a safety valve that is provided on the sealing plate and opens when the internal pressure of the outer can rises to a specified value or more, The current interruption mechanism can be configured to operate before the safety valve.

  Furthermore, according to the secondary battery cell according to the eighth aspect, the safety valve is formed of a metal valve-opening plate, and the valve-opening plate is pushed into the outer can side so that the discharge The safety valve can be used in combination with the forced discharge mechanism. With the above configuration, it is possible to perform forced discharge through the safety valve, and it is possible to reduce the additional cost for forced discharge by using a common member.

  Furthermore, according to the secondary battery cell which concerns on a 9th side surface, the said forced discharge mechanism can be comprised so that it can electrically connect with the said discharge lead board manually. With the above configuration, the user can manually discharge the secondary battery cell according to the operation of the current interrupt mechanism or the opening of the safety valve, and the remaining capacity can be reduced safely.

  Furthermore, in the secondary battery cell according to the tenth aspect, the discharge path connects the auxiliary terminal and the other electrode terminal of the pair of electrode terminals via a discharge resistor. It can be configured with a discharge circuit.

  Furthermore, according to the secondary battery cell which concerns on an 11th side surface, the said electric current interruption mechanism can be made into CID.

  Furthermore, according to the secondary battery cell which concerns on a 12th side surface, the said electric current interruption mechanism can be provided in the positive electrode side of the said secondary battery cell.

  Furthermore, according to the power supply device according to the thirteenth aspect, a plurality of the battery cells can be stacked.

  Furthermore, according to the vehicle according to the fourteenth aspect, the power supply device described above can be provided.

  Furthermore, according to the power storage device of the fifteenth aspect, the power supply device described above can be provided.

It is a perspective view which shows the external appearance of the power supply device which concerns on embodiment. It is the disassembled perspective view which decomposed | disassembled the press part and the sealing member from the power supply device of FIG. It is the disassembled perspective view which decomposed | disassembled the secondary battery cell, the separator, and the end plate from the power supply device of FIG. FIG. 4 is a vertical longitudinal sectional view of the battery cell shown in FIG. 3. FIG. 4 is a vertical cross-sectional view of the battery cell shown in FIG. 3. It is a schematic sectional drawing which shows an example of an electric current interruption mechanism. It is sectional drawing which shows the state which the electric current interruption mechanism shown in FIG. 6 interrupts | blocks an electric current. It is a schematic cross section which shows the discharge path | route of the secondary battery cell of FIG. It is a schematic sectional drawing which shows another example of an electric current interruption mechanism. 6 is a schematic cross-sectional view showing a secondary battery cell according to Example 2. FIG. It is a schematic cross section which shows the state which CID of the secondary battery cell of FIG. 10 act | operated. It is a schematic cross section which shows the state which pushes in a safety valve from the state of FIG. It is a schematic cross section which shows the state which pushed in the safety valve further from the state of FIG. 12, and was connected with the internal electrode. It is a schematic cross section which shows the state which the safety valve of the secondary battery cell of FIG. 10 opened. It is a schematic cross section which shows the state which connected the discharge circuit to the secondary battery cell of FIG. It is a block diagram which shows the example which mounts a power supply device in the hybrid vehicle which drive | works with an engine and a motor. It is a block diagram which shows the example which mounts a power supply device in the electric vehicle which drive | works only with a motor. It is a block diagram which shows the example applied to the power supply device for electrical storage. It is sectional drawing which shows a secondary battery cell provided with the conventional CID. It is sectional drawing which shows the state at the time of normal of CID of FIG. FIG. 20 is a cross-sectional view of the CID of FIG. 19 showing a state where the internal pressure of the secondary battery cell has increased.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a secondary battery cell, a power supply device, a vehicle including the power supply device, and a power storage device for embodying the technical idea of the present invention. The battery cell, the power supply device, the vehicle including the power supply device, and the power storage device are not specified as follows. Further, the dimensions, materials, shapes, relative arrangements, and the like of the constituent members described in the embodiments are not intended to limit the scope of the present invention only to the description unless otherwise specified. It is just an example. Note that the size, positional relationship, and the like of the members shown in each drawing may be exaggerated for clarity of explanation. Furthermore, in the following description, the same name and symbol indicate the same or the same members, and detailed description thereof will be omitted as appropriate. Furthermore, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and the plurality of elements are shared by one member, and conversely, the function of one member is constituted by a plurality of members. It can also be realized by sharing. In addition, the contents described in some examples and embodiments may be used in other examples and embodiments.
(Embodiment 1)

Hereinafter, an example applied to a vehicle power supply device as an embodiment of the power supply device will be described with reference to FIGS. In these drawings, FIG. 1 is an external perspective view of the battery block 10 constituting the power supply device, FIG. 2 is an exploded perspective view in which the safety valve duct 24, the pressing portion 22, and the seal member 20 are disassembled from FIG. 2 shows exploded perspective views in which the secondary battery cell 1, the separator 6 and the end plate 7 are disassembled. The battery block 10 has a box shape as shown in FIG. A plurality of battery blocks 10 are connected in series or in parallel to constitute a power supply device. As shown in the exploded perspective view of FIG. 2, each battery block 10 includes a battery block 10 in which a plurality of secondary battery cells 1 are stacked, a seal member 20, a pressing portion 22, and a safety valve duct 24. . The safety valve duct 24 is in communication with the safety valve 3 of the secondary battery cell 1.
(Battery block 10)

As shown in the exploded perspective view of FIG. 3, the battery block 10 is formed by laminating a plurality of secondary battery cells 1 via an insulating separator 6, and by fastening end plates 7 on both end faces. Block body. The end plates 7 on both end surfaces are fastened with a bind bar (not shown). The bind bar is disposed on the side surface or the upper surface of the battery block 10. This bind bar is configured by bending a metal plate. Thus, the battery block 10 can be firmly held by sandwiching the laminated body of the secondary battery cells 1 between the end plates 7 fastened by the bind bar.
(Secondary battery cell 1)

  As shown in FIG. 3, the secondary battery cell 1 uses a thin outer can 2 whose thickness is thinner than the horizontal width of the upper side. In other words, the outer can 2 has a thick rectangular plate shape. The outer can 2 has a substantially box shape in which the four corners of the outer can 2 are chamfered. The sealing plate 4 that seals the outer can 2 on the upper surface of the outer can 2 has a pair of electrode terminals 5 protruding and a safety valve 3 provided between the electrode terminals 5. The safety valve 3 is configured to open when the internal pressure of the outer can 2 rises to a predetermined value or more, and to release the internal gas. By opening the safety valve 3, the increase in the internal pressure of the outer can 2 can be stopped. Here, in order to efficiently guide the exhaust gas discharged from the safety valve 3 in general, the secondary battery cell 1 is stacked so that the safety valve 3 is arranged on one surface (the upper surface in the present embodiment) of the battery block 10. Is done.

The unit cell constituting the secondary battery cell 1 is a rechargeable secondary battery such as a lithium ion battery, a nickel-hydrogen battery, or a nickel-cadmium battery. In particular, when a lithium ion battery is used for a thin battery, there is an advantage that the charge capacity with respect to the capacity of the whole pack battery can be increased.
(Circuit board 26)

  A circuit board 26 is disposed on the upper surface of the safety duct 24. As described above, the circuit board 26 is arranged on the upper surface of the battery block 10, so that when the plurality of battery blocks are coupled to each other, the coupling surface does not interfere with the circuit board 26 and the battery block can be downsized. Is advantageous.

In the example of FIGS. 1 to 2, the bus bar 27 that connects the electrode terminals 5 of the adjacent secondary battery cells 1 is provided on the upper surface of the battery block 10. The bus bar 27 extends in parallel along the stacking direction of the secondary battery cells 1, and the arrangement lines of the pair of bus bars 27 are separated from each other on the upper surface of the battery block 10. By disposing the circuit board 26 between the pair of bus bars 27 spaced apart in this way, the battery block 10 can be prevented from being thickened, which is advantageous for downsizing the battery block and the power supply device.
(Current interruption mechanism 30)

  As shown in the cross-sectional views of FIGS. 4 to 5, the secondary battery cell 1 stores the internal electrode 28 in which the positive and negative electrode plates 28 </ b> A are stacked via the separator 28 </ b> C in the outer can 2, and stores the electrolyte solution. Filled. Further, the secondary battery cell 1 has a current interrupt device 30 (CID) built in the outer can 2. When the internal pressure of the secondary battery cell 1 becomes higher than the set pressure, the current interrupt mechanism 30 is deformed so as to separate the connection points and interrupts the current. Specific examples of the current interrupt mechanism 30 are shown in the schematic cross-sectional views of FIGS. In the secondary battery cell 1 shown in these drawings, the current interruption mechanism 30 is connected between the electrode tab 31 connected to the internal electrode 28 and the electrode terminal 5 fixed to the sealing plate 4. . The current interruption mechanism 30 in the ON state connects the electrode tab 31 to the electrode terminal 5. When the current interrupting mechanism 30 is turned off, the electrode tab 31 is not connected to the electrode terminal 5 and the current of the secondary battery cell 1 is interrupted.

  FIG. 6 shows a state where the current interrupt mechanism 30 does not interrupt the current, and FIG. 7 shows a state where the current is interrupted. The current interrupting mechanism 30 shown in these drawings includes a deformed metal plate 33 that is deformed by the internal pressure of the secondary battery cell 1 and a connecting metal 34 that is formed by welding and locally connecting local portions of the deformed metal plate 33. . When the internal pressure of the secondary battery cell 1 becomes higher than the set pressure, the current interruption mechanism 30 deforms the deformed metal plate 33 with pressure as shown in FIGS. Separate from 34 to cut off current.

  The deformed metal plate 33 of the current interruption mechanism 30 shown in the figure is a diaphragm 35 that is processed to be curved in an arch shape. The diaphragm 35 has an outer peripheral portion coupled to the lower end of the electrode terminal 5 fixed to the sealing plate 4, and a protruding portion thereof is welded to a connection metal 34 to be electrically connected. The connection metal 34 is connected to the electrode tab 31. The current interruption mechanism 30 is turned on when the diaphragm 35 is connected to the connection metal 34. Further, the current interruption mechanism 30 shown in the figure accommodates the diaphragm 35 and the connecting metal 34 in an inner case 36 made of an insulating material such as plastic.

  The inner case 36 communicates the lower surface of the diaphragm 35 to the inside of the secondary battery cell 1 in FIGS. 6 to 7 and hermetically seals the upper surface of the diaphragm 35. The inner pressure of the secondary battery cell 1 does not act on the upper surface of the diaphragm 35 that is hermetically sealed. The current interruption mechanism 30 having this structure applies the internal pressure of the secondary battery cell 1 to the lower surface of the diaphragm 35 and pushes up the diaphragm 35 with the internal pressure. The pushing force of the diaphragm 35 increases in proportion to the internal pressure of the secondary battery cell 1. Therefore, when the internal pressure of the secondary battery cell 1 rises, the diaphragm 35 is pushed upward and deforms from the state shown in FIG. 6 as shown in FIG. When the diaphragm 35 is deformed to the state shown in FIG. 7, the diaphragm 35 is separated from the connection metal 34 and interrupts the current of the secondary battery cell 1. The diaphragm 35 deformed to the state shown in FIG. 7 is held in this shape and is held in a state of interrupting current, that is, in the OFF state, and does not return to the ON state. Therefore, the current interrupt mechanism 30 interrupts the current when the internal pressure of the secondary battery cell 1 becomes higher than the set pressure, and then holds the current in a state of interrupting the current.

The current interrupting mechanism may be provided on either the positive electrode side or the negative electrode side of the secondary battery cell, but is preferably provided on the positive electrode side of the secondary battery cell. In the case of a lithium ion secondary battery, the positive electrode is generally made of aluminum and the negative electrode is made of copper. For this reason, the current interruption mechanism can be easily mounted by providing the current interruption mechanism on the positive electrode side which is easy to machine.
Example 1

Next, schematic cross-sectional views of the secondary battery cell according to Example 1 will be described with reference to FIGS. The secondary battery cell shown in these drawings includes an internal electrode 28 accommodated in the outer can 2, an electrode terminal 5, a current interruption mechanism 30, an auxiliary terminal 50, and a moving terminal 52.
(Auxiliary terminal 50)

  The auxiliary terminal 50 protrudes from the sealing plate 4 on the upper surface of the outer can 2. When it is desired to forcibly discharge the remaining capacity, such as when the secondary battery cell is discarded, a discharge path is connected to the auxiliary terminal 50. As shown in FIG. 8, the discharge path is connected to the negative electrode side of the secondary battery cell via, for example, a discharge resistor R. Alternatively, when a discharge path is connected to the auxiliary terminal 50 of each secondary battery cell in a state of being incorporated in the power supply device, when any secondary battery cell becomes abnormal and the current interrupting mechanism 30 operates. Immediately, the remaining capacity of the secondary battery cell is forcibly discharged. With this configuration, since discharge is automatically performed in the event of an abnormality, there is no risk of forgetting to discharge at the time of discard or the like, and it is possible to save the trouble of manually performing the discharge operation one by one. On the other hand, it is necessary to connect a discharge path to each secondary battery cell, and it is also necessary to consider the heat dissipation of the discharge resistor.

As shown in the cross-sectional views of FIGS. 6 to 7, the auxiliary terminal 50 penetrates the sealing plate 4 in a rod shape from the inside and protrudes to the outside. On the inside of the sealing plate 4, the auxiliary terminal 50 is enlarged in a bowl shape, A contact surface 50b with the moving terminal 52 is formed.
(Moving terminal 52)

The moving terminal 52 is a terminal that is brought into contact with the auxiliary terminal 50 in conjunction with the operation of the current interrupt mechanism 30 and makes the auxiliary terminal 50 conductive with the internal electrode 28. In the example of FIG. 6, the moving terminal 52 includes a plate-like base portion 52a and a contact portion 52b provided at one end of the base portion 52a. The base 52a is formed in a slip shape having a spring property, and one end is a fixed end and the other end is a free end. A contact portion 52b is provided at the end on the free end side. The moving terminal 52 is entirely made of metal having conductivity, and is interposed between the connection metal 34 and the deformed metal plate 33. 6 and 7, the fixed end side of the moving terminal 52 is positioned between the diaphragm 35 and the connection metal 34. Here, an insulating rib 37 is protruded from the lower surface of the inner case 36, and the upper surface of the fixed end is pressed by the rib 37 to sandwich the moving terminal 52 with the connection metal 34. On the other hand, the free end is movable, and is biased so that the free end is bent upward and the contact portion 52b is connected to the auxiliary terminal 50 as shown in FIG. In this way, the base 52a has a biased leaf spring shape.
(When the current interruption mechanism 30 is not operated)

Here, when the current interrupt mechanism 30 is in a normal state, the diaphragm 35 protrudes outward with respect to the inner case 36 as shown in FIG. In this state, the diaphragm 35 is pressed against the connecting metal 34 against the urging force of the base 52a. In this state, the diaphragm 35 and the base 52a, and the base 52a and the connection metal 34 are in contact with each other so that the electrode terminal 5 and the electrode tab 31 are electrically connected and the secondary battery cell 1 is energized. Composed. In this example, as described above, the projecting portion of the diaphragm 35 is partially welded to the base portion 52a. Thus, when the current interrupt mechanism 30 is not operated, the moving terminal 52 is separated from the auxiliary terminal 50 as shown in FIG.
(When the current interruption mechanism 30 is activated)

  When the internal pressure of the secondary battery cell 1 rises and the current interrupting mechanism 30 is activated, the diaphragm 35 is pressed and reversed by the high pressure in the outer can 2 of the secondary battery cell 1, and FIG. 6 to FIG. Transition to the state. In this state, since the pressure on the base 52a by the diaphragm 35 is released, the free end is lifted by the biasing force of the base 52a, the contact portion 52b contacts the auxiliary terminal 50, and the electrode tab 31 and the auxiliary terminal 50 are electrically connected. To come. As described above, the moving terminal 52 is deformed in conjunction with the movement of the current interrupt mechanism 30 and functions to be electrically connected to the auxiliary terminal 50. As a result, as shown in FIG. 8, the auxiliary terminal 50 is energized with the internal electrode 28, and discharge through the auxiliary terminal 50 becomes possible.

  The above-described structure is an example, and the structure and shape of the moving terminal and the auxiliary terminal can be changed as appropriate. For example, it is not always necessary to press and fix the base 52a of the moving terminal with an insulating member such as a rib. For example, as in the modification shown in FIG. 34 and the moving terminal 50 can be shared. According to these configurations, the moving terminal fixing structure can be simplified.

As described above, by applying a discharge current through the moving terminal 52 and the auxiliary terminal 50, the residual charge held in the internal electrode 28 can be forcibly discharged. As a result, since the discharge can be performed without using the electrode terminal 5 connected by the current interrupting mechanism 30, it is possible to discharge safely even after the current interrupting mechanism 30 operates, that is, even in a state where it cannot normally be discharged. Is possible. Also, with this method, since the discharge through the auxiliary terminal 50 is automatically performed when the current interrupting mechanism 30 is operated, it is simple and there is no need to perform a discharge operation again when the battery cell is discarded. Since you don't forget to discharge at times, safety is improved.
(Example 2)

  In the first embodiment described above, the example in which the auxiliary terminal is energized in conjunction with the operation of the current interrupt mechanism has been described. However, the present invention is not limited to this configuration, and can be configured to perform electrical connection with a discharge path for manually forcibly discharging after the operation of the current interrupt mechanism. Such a configuration example will be described as a second embodiment with reference to FIGS. In these drawings, FIG. 10 is a schematic cross-sectional view showing a secondary battery cell according to Example 2, FIG. 11 is a schematic cross-sectional view showing a state in which the CID of the secondary battery cell in FIG. 10 is activated, and FIG. FIG. 13 is a schematic cross-sectional view showing a state where the safety valve 3 is further opened from the state of FIG. 12, and FIG. 13 is a schematic cross-sectional view showing a state where the safety valve 3 is further pushed from the state of FIG. .

The secondary battery cell shown in these drawings includes an internal electrode 28 accommodated in the outer can 2, a current interruption mechanism 30, a discharge lead plate 29, and a forced discharge mechanism. In this secondary battery cell, after the current interruption mechanism 30 is operated as shown in FIG. 11, the discharge lead plate 29 and the outer can 2 are made conductive by the forced discharge mechanism as shown in FIG. Forced discharge is performed by connecting the circuit. This forced discharge mechanism is manually switched to a conductive state, that is, a forced discharge state. In other words, the operation of the current interrupt mechanism 30 and the discharge operation are not linked, and the user performs a forced discharge at an arbitrary timing. In addition, the thing similar to Example 1 can be utilized for the electric current interruption mechanism 30. FIG.
(Forced discharge mechanism)

The forced discharge mechanism presses the surface of the outer can 2 to forcibly connect the outer can 2 and the discharge lead plate 29. As a result, the residual charge held in the internal electrode 28 is conducted through the discharge lead plate 29 and the outer can 2 and is forcibly discharged.
(Discharge lead plate 29)

  A discharge lead plate 29 is fixed to the internal electrode 28. The discharge lead plate 29 extends in a direction parallel to the sealing plate 4 inside the outer can 2 to a position corresponding to the forced discharge mechanism. In this example, the discharge lead plate 29 is pulled out from the inner case 36.

  Further, the forced discharge mechanism can be shared with the safety valve 3. That is, the battery sealing plate 4 is provided with a safety valve 3 that opens when the internal pressure of the outer can 2 rises above a specified value. The safety valve 3 is opened so as to be pushed upward as shown in FIG. In other words, since the safety valve 3 is designed to be deformed by pressure, the safety valve 3 is bent in the opposite direction as shown in FIGS. 12 and 13 and connected to the discharge lead plate 29 as a forced discharge mechanism. Can be used together.

  The current interrupting mechanism 30 is also activated by an increase in the internal pressure of the outer can 2. Here, the current interrupting mechanism 30 is set to operate before the safety valve 3. For this reason, even if the electric current interruption mechanism 30 is act | operating, it may not open as shown in FIG. In this case, as shown in FIG. 12, the jig is pushed in from above the safety valve 3 to open the valve, and the internal pressure of the outer can 2 is reduced by releasing high-pressure gas to the outside, as shown in FIG. In this way, it is brought into contact with the discharge lead plate 29 and discharged through the outer can 2.

  Further, as shown in FIG. 14, even when the safety valve 3 is opened together with the current interrupting mechanism 30, similarly, as shown in FIG. 13, the safety valve 3 is bent downward from the bent state. And can be brought into contact with the discharge lead plate 29. In this case, since the internal pressure of the outer can 2 has already decreased, the work can be performed more safely.

  In this way, the discharge lead plate 29 and the outer can 2 are made conductive with the safety valve 3. In this state, since the outer can 2 functions as an electrode, a discharge circuit is connected between the outer can 2 and the other electrode terminal (for example, the negative electrode terminal) that is not provided with the current interruption mechanism 30 to perform forced discharge. It can be carried out. As an example of the connection of such a discharge circuit, as shown in FIG. 15, for example, an auxiliary terminal 50C is provided in the outer can 2 in advance, and an external discharge circuit is provided between the auxiliary terminal 50C and the other electrode terminal 5C. Connect. As the discharge circuit, for example, a circuit in which a discharge resistor R is interposed may be used.

  As described above, the safety valve 3 can be used in combination with the forced discharge mechanism. The safety valve 3 includes a metal valve opening plate 3a. The length of the valve opening plate 3a and the arrangement position of the discharge lead plate 29 are determined so that the valve opening plate 3a can be connected to the discharge lead plate 29 by being pushed into the outer can 2 side. In particular, since the safety valve 3 is inherently bent so as to be freely opened, the mechanism can be shared by connecting the discharge lead plate 29 with this bending mechanism.

  In the above example, the example in which the safety valve 3 is used in combination with the forced discharge mechanism has been described. However, the present invention is not limited to this configuration, and a forced discharge mechanism that connects the outer can 2 to the discharge lead plate 29 as a separate member from the safety valve may be employed. Alternatively, the surface of the outer can is directly engraved in correspondence with the position where the discharge lead plate 29 is provided, and a thin portion or a cut is provided. It is good also as a structure to discharge.

  The discharge lead plate 29 is preferably extended from the contact point of the current interrupt mechanism 30 as shown in FIG. As a result, the contact of the current interrupt mechanism 30 and the contact for forced discharge can be made common, which can contribute to cost reduction. In the example of FIG. 13, in the discharge lead plate 29, the height of the contact portion with the current interruption mechanism 30 is reduced, and the storage space for the current interruption mechanism 30 is between the discharge lead plate 29 and the electrode terminal 5. Is provided. On the other hand, at the contact portion with the forced discharge mechanism, the discharge lead plate 29 is positioned higher to facilitate contact with the forced discharge mechanism. For this reason, the discharge lead plate 29 is a metal plate bent in a step shape at an intermediate portion.

A power supply device configured by stacking the battery cells described above can be used as an in-vehicle power supply. As a vehicle equipped with a power supply device, an electric vehicle such as a hybrid vehicle or a plug-in hybrid vehicle that runs with both an engine and a motor, or an electric vehicle that runs only with a motor can be used, and is used as a power source for these vehicles. .
(Power supply for hybrid vehicles)

FIG. 16 shows an example in which a power supply device is mounted on a hybrid vehicle that travels with both an engine and a motor. A vehicle HV equipped with the power supply device shown in this figure includes an engine 96 and a travel motor 93 that travel the vehicle HV, a power supply device 100 that supplies power to the motor 93, and a generator that charges a battery of the power supply device 100. 94. The power supply apparatus 100 is connected to a motor 93 and a generator 94 via a DC / AC inverter 95. The vehicle HV travels by both the motor 93 and the engine 96 while charging / discharging the battery of the power supply device 100. The motor 93 is driven to drive the vehicle when the engine efficiency is low, for example, during acceleration or low-speed driving. The motor 93 is driven by power supplied from the power supply device 100. The generator 94 is driven by the engine 96 or is driven by regenerative braking when the vehicle is braked to charge the battery of the power supply device 100.
(Power supply for electric vehicles)

FIG. 17 shows an example in which a power supply device is mounted on an electric vehicle that runs only with a motor. A vehicle EV equipped with the power supply device shown in this figure includes a traveling motor 93 for traveling the vehicle EV, a power supply device 100 that supplies power to the motor 93, and a generator 94 that charges a battery of the power supply device 100. And. The motor 93 is driven by power supplied from the power supply device 100. The generator 94 is driven by energy when regeneratively braking the vehicle EV and charges the battery of the power supply device 100.
(Power storage device for power storage)

  Furthermore, this power supply apparatus can be used not only as a power source for a moving body but also as a stationary power storage facility. For example, as a power source for home and factory use, a power supply system that is charged with sunlight or midnight power and discharged when necessary, or a streetlight power supply that charges sunlight during the day and discharges at night, or during a power outage It can also be used as a backup power source for driving signals. Such an example is shown in FIG. The power supply apparatus 100 shown in this figure forms a battery unit 82 by connecting a plurality of battery packs 81 in a unit shape. Each battery pack 81 has a plurality of secondary battery cells 1 connected in series and / or in parallel. Each battery pack 81 is controlled by a power controller 84. The power supply apparatus 100 drives the load LD after charging the battery unit 82 with the charging power supply CP. For this reason, the power supply apparatus 100 includes a charging mode and a discharging mode. The load LD and the charging power source CP are connected to the power supply device 100 via the discharging switch DS and the charging switch CS, respectively. ON / OFF of the discharge switch DS and the charge switch CS is switched by the power supply controller 84 of the power supply apparatus 100. In the charging mode, the power supply controller 84 switches the charging switch CS to ON and the discharging switch DS to OFF to permit charging from the charging power supply CP to the power supply apparatus 100. Further, when the charging is completed and the battery is fully charged, or in response to a request from the load LD in a state where a capacity of a predetermined value or more is charged, the power controller 84 turns off the charging switch CS and turns on the discharging switch DS to discharge. The mode is switched to permit discharge from the power supply apparatus 100 to the load LD. Further, if necessary, the charge switch CS can be turned on and the discharge switch DS can be turned on to supply power to the load LD and charge the power supply device 100 at the same time.

  A load LD driven by the power supply apparatus 100 is connected to the power supply apparatus 100 via a discharge switch DS. In the discharge mode of the power supply apparatus 100, the power supply controller 84 switches the discharge switch DS to ON, connects to the load LD, and drives the load LD with the power from the power supply apparatus 100. As the discharge switch DS, a switching element such as an FET can be used. ON / OFF of the discharge switch DS is controlled by the power supply controller 84 of the power supply apparatus 100. The power controller 84 also includes a communication interface for communicating with external devices. In the example of FIG. 18, the host device HT is connected in accordance with an existing communication protocol such as UART or RS-232C. Further, if necessary, a user interface for the user to operate the power supply system can be provided.

  Each battery pack 81 includes a signal terminal and a power supply terminal. The signal terminals include a pack input / output terminal DI, a pack abnormality output terminal DA, and a pack connection terminal DO. The pack input / output terminal DI is a terminal for inputting / outputting signals from other pack batteries and the power supply controller 84, and the pack connection terminal DO is for inputting / outputting signals to / from other pack batteries which are child packs. Terminal. The pack abnormality output terminal DA is a terminal for outputting the abnormality of the battery pack to the outside. Furthermore, the power supply terminal is a terminal for connecting the battery packs 81 in series and in parallel. The battery units 82 are connected to the output line OL via the parallel connection switch 85 and are connected in parallel to each other.

  A secondary battery cell, a power supply device, a vehicle including the power supply device, and a power storage device according to the present invention include a plug-in hybrid electric vehicle, a hybrid electric vehicle, and an electric vehicle that can switch between an EV traveling mode and an HEV traveling mode. It can be suitably used as a power supply device. Also, a backup power supply device that can be mounted on a rack of a computer server, a backup power supply device for a wireless base station such as a mobile phone, a power storage device for home use and a factory, a power supply for a street light, etc. Also, it can be used as appropriate for applications such as a backup power source such as a traffic light.

DESCRIPTION OF SYMBOLS 100 ... Power supply device 1 ... Battery cell 2 ... Exterior can 3 ... Safety valve; 3a ... Valve-opening plate 4 ... Sealing plate 5, 5C ... Electrode terminal 6 ... Separator 7 ... End plate 10 ... Battery block 20 ... Seal member 21 ... Seal opening Part 22 ... Pressing part 23 ... Pressing opening 24 ... Safety valve duct 26 ... Circuit board 27 ... Bus bar 28 ... Internal electrode; 28A ... Electrode plate; 28C ... Separator 29 ... Discharge lead plate 30 ... Current blocking mechanism 31 ... Electrode tab 33 ... Deformed metal plate 34 ... Connection metal 35 ... Diaphragm 36 ... Inner case 37 ... Rib 38 ... Conductive part 39 ... Insulating material 50, 50C ... Auxiliary terminal; 50b ... Contact surface 52 ... Moving terminal; 52a ... Base part; 52b ... Contact part 81 Battery pack 82 Battery unit 84 Power controller 85 Parallel connection switch 93 Motor 94 Generator 95 Inverter 96 Engine 2 1 ... secondary battery cell 205 ... electrode terminal 228 ... internal electrode 230 ... CID
R ... Discharge resistance HV, EV ... Vehicle LD ... Load; CP ... Charge power supply; DS ... Discharge switch; CS ... Charge switch OL ... Output line; HT ... Host device DI ... Pack input / output terminal; DA ... Pack abnormal output terminal ; DO ... Pack connection terminal

Claims (15)

An outer can,
An internal electrode housed in the outer can;
A pair of electrode terminals electrically connected to the internal electrodes;
A current interrupt mechanism configured to be interposed between an electrical connection between one of the pair of electrode terminals and the internal electrode, and configured to be capable of interrupting an electrical connection between the electrode terminal and the internal electrode; ,
A secondary battery cell comprising:
An auxiliary terminal for discharging the charge held in the internal electrode;
In the outer can, the auxiliary terminal is provided apart from the auxiliary terminal, and is displaced in correlation with the current interruption mechanism. When the current interruption mechanism is activated, the auxiliary terminal and the internal electrode are brought into contact with the auxiliary terminal. A secondary battery cell, comprising: a moving terminal that conducts the current. The secondary battery cell according to claim 1,
The secondary battery cell, wherein the auxiliary terminal is exposed outside the outer can. The secondary battery cell according to claim 1 or 2,
The current interruption mechanism has a deformed metal that deforms according to the pressure in the outer can,
The deformed metal presses the moving terminal, the moving terminal is urged in a direction close to the auxiliary terminal, and is electrically connected to the internal electrode through the moving terminal. A secondary battery cell configured to be configured such that electrical connection between the electrode terminal and the internal electrode is interrupted by deformation of metal. An outer can,
An internal electrode housed in the outer can;
A sealing plate for closing the upper surface of the outer can;
A pair of electrode terminals electrically connected to the internal electrode and provided on the sealing plate;
Among the pair of electrode terminals, one electrode terminal is interposed between the electrical connection with the internal electrode, and operates when the internal pressure of the outer can rises to a specified value or more, and the electrical connection A current interrupt mechanism for interrupting,
With
The outer can is a secondary battery cell that is electrically connected to any one of the pair of electrode terminals, and
A discharge lead plate electrically connected to the internal electrode;
A forced discharge mechanism for forcibly discharging the residual charge held in the internal electrode by pressing the surface of the outer can and forcibly conducting the outer can and the discharge lead plate;
A secondary battery cell comprising: The secondary battery cell according to claim 4,
The secondary battery cell, wherein the discharge lead plate is extended to a position corresponding to the forced discharge mechanism in a direction parallel to the sealing plate inside the outer can. The secondary battery cell according to claim 5,
The secondary battery cell, wherein the discharge lead plate is extended from a contact point of the current interrupt mechanism. The secondary battery cell according to any one of claims 4 to 6, further comprising:
Provided on the sealing plate, provided with a safety valve that opens when the internal pressure of the outer can rises above a specified value,
The secondary battery cell, wherein the current interrupt mechanism is configured to operate before the safety valve. The secondary battery cell according to claim 7,
The safety valve is made of a metal valve opening plate;
The valve-opening plate is formed into a size capable of conducting with the discharge lead plate by being pushed into the outer can side, and the safety valve is used in combination with the forced discharge mechanism. Battery cell. A secondary battery cell according to any one of claims 4 to 8,
The secondary battery cell, wherein the forced discharge mechanism is configured to be manually connectable to the discharge lead plate. The secondary battery cell according to any one of claims 1 to 9,
A secondary battery cell, wherein the discharge path is configured by a discharge circuit in which the auxiliary terminal and the other electrode terminal of the pair of electrode terminals are connected via a discharge resistor. . A secondary battery cell according to any one of claims 1 to 10,
The secondary battery cell, wherein the current interruption mechanism is a CID. The secondary battery cell according to any one of claims 1 to 11,
The secondary battery cell, wherein the current interruption mechanism is provided on a positive electrode side of the secondary battery cell.   The power supply device formed by laminating | stacking two or more secondary battery cells as described in any one of Claims 1-12.   A vehicle comprising the power supply device according to claim 13.   A power storage device comprising the power supply device according to claim 13.

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